185 
 
 T4-5- 
 
 1914 
 
 LaboratoRyApparatus 
 
 AND 
 
 Reagents 
 
 Arthur H.Thomas Company 
 
 WE ST WASHINGTON SQUARE 
 
 PHILADELPHIA 
 ■ U. S. A. 
 
I 25' 
 
 S^j ^■*" 
 
 lllf 
 
 BENNET R, MA0UTLL4N 
 
 STWSON HALL 
 
 OORNELL UNTVEBtlTY 
 
 VSit^lL. K. T. 
 
Cornell University Library 
 O 185.T45 1914 
 
 Labocalory apparatus and ''[|,J.'j,';S|5|»|i'''" 
 
 "'3 1921' 012 252 205 
 
 niiNMP.RARV-r.iRniiiAnr-.i'j 
 
 DATE DUE 
 
 
 
 
 
 nWJT'ff* 
 
 ^M- 
 
 
 
 ?^^ 
 
 "yiji5i»« 
 
 
 
 
 
 
 
 
 
 W&^ 
 
 S \9% 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 GAYLOh, 
 
 
 
 PR|[.iLDItJU,S.A, 
 
The original of tliis book is in 
 tlie Cornell University Library. 
 
 There are no known copyright restrictions in 
 the United States on the use of the text. 
 
 http://www.archive.org/details/cu31924012252205 
 
LABORATORY APPARATUS 
 
 AND 
 
 REAGENTS 
 
 M':i,KCIKI> Kim LABOKAIOKTES 01- 
 
 CHEMISTRY AND BIOLOGY 
 
 IN THKIK AI'I'LICATIDN TO 
 
 EDUCATION. THE INDUSTRIES, MEDICINE AND 
 THE rUHEIC IIEAETH 
 
 lNCI,L'DIN<i SDME RQIKI'MKNT KOC, 
 
 METAEEUHGV, MINEKAEOCV. THE TESTING OF 
 >IATE1JIAES, AND OPTICAE I'UO.IECTION 
 
 \%.^' 
 
 
 ARTHUR H. THOMAS COMPANY 
 
 WEST WASHINGTON SQUARE 
 
 (•.Ml) SOUTH SFA'ENTH ST.) 
 
 PHILADELEHIA 
 
 U. S. A. 
 
■ STA^-^^ 
 
 BROAD ST. 
 
 "Hour oldI I I \~\r 
 
 nnDD,rj'D[ 
 
 son go n[ 
 
 mUDD[ 
 
 AOijRNEW 
 I LOCATION 
 
 I IWASWIHGTON 
 
 nt a(Bu1dii>), 
 
 111 DLueiiibei 1012 \vi. movtJ to the Farm Journal Building, a new concrete, fire-proof structure luxated 
 on We=!t '\\ j'-hington Square (230-2-4 South Seventh Street), a neighborhood which has become the publishing 
 centre of Philidclphi i Thr- fourth ind fifth floors of the building and a portion of the basement were designed 
 
 the lequirements of our business. The increase of our total floor space to 
 I iiiii that occupied by us at Twelfth and ^Yalnut Sts.) has distinctly increased 
 
 II I 1 ippioximately 8400 _sq. ft. is devoted to salesroom and offices. In this sales- 
 
 I uiunt e hibit of over 6,000 different pieces of Laboratory Apparatus, all conveniently 
 arrant,td foi inspection and handling by our visitors. A dark room is provided for the demonstration o"f 
 Projection and Photo Miciogiiphic Apparatus. Our office space is well lighted and ventilated and contributes 
 to the Lomfoit md \m ifire of our employees as well as to the thoroughness of their work. Soine intiMim- views 
 of our estihh hmi nl u fu b U und on various pages throughout the catalogue 
 
 and built v( it] 
 40,000 sq II 
 the general 
 
 Ot the .1 I 
 
 room \\(, niaiutam 
 
 W).HhinKl«n Siruaro Side if Shu \rti>rn ronkini; Nnrlh 
 
PREFACE. 
 
 We believe that the principles underlying the organization and daily conduct of our business are understood 
 and generally endorsed by those familiar with them. The following discussion is, therefore, offered chiefly for 
 the information of those hitherto without experience in dealing with us. 
 
 PRICES— The prices throughout this catalogue are subject to change without notice. This is largely because 
 the goods listed originate in over twelve himdred factories and in manj' instances ive have no control 
 oyer either the cost or the selling price. Certain discounts are allowed from our list prices to Institu- 
 tions, State, City and U. S. Government Departments, Industrial Concerns and other organized 
 establishments, conducting regular laboratory work, because of their aggregate annual purchasing 
 power. These discounts are not allowed on occasional purchases of a few items only by those not 
 regularly connected with laboratory work. Our discount sheet will be published at frequent intervals 
 and important changes in both list price and discount noted therein. Prices on items not regularly 
 carried in stock and designated "Duty Free" and "Duty Paid" are subject to more variation than 
 regular stock prices because they are directly dependent upon the sixe of the individual order. (See 
 also paragraph "Duty Free Importation" below, ) They are printed for the guidance of customers in 
 ascertaining the cost of individual items apart from large importation orders and in most instances 
 the prices given apply to the importation of a single item of the article listed. 
 
 BREAKAGE AND SHORTAGE — We make no claim as to our infallibility and, while our goods are checked and 
 packed by experienced employees under rigid control, breakages and shortafies occnsionally occur 
 because of defective packing or of our mistakes. When such c';ii;ii.-. m^ iL-nly mnl pniiMjifly [ne- 
 sented to us it is our custom to ad j ust them without undue argumen i ■ i ■ ,> < 1 1 1 1 ■ i ■ . . 1 1 1 ■ , , 1 1 m i ■ ■ i I ■ i ■ ■ 1 1 
 
 terms of contract to an underlying spirit of fairness and to maim ■! I'.i.i ■, ,■ i i, , ,. ^ n 
 
 until our customer receives full satisfaction and value, no matter '■. I.i(. i.n ■.■. ;- i, (i,n- ■ ■ ■ I i:i''il ■ '-in'U- 
 sibility may end. We further assist in presenting established claims agaiiisit the Lranspuitation 
 companies from which we hold receipts for shipments. Customers will greatly facilitate the adjustment 
 of such claims by refusing to receipt for goods received in damaged condition, until they have been 
 examined and condition noted by the local freight or express agent. 
 
 STOCK — Unless otherwise designated the goods in this catalogue are mostly in stock for immediate delivery. 
 A few domestic items of great weight or bulk are not always on hand but prompt factory delivery is 
 usually possible. In addition, there are certain articles of European origin listed with both duty free 
 and duty paid prices. Such designation indicates that they are not regularly carried in stock, usually 
 because the demand for them is confined to institutions entitled to duty free importation. Where the 
 word "Stock" is used the article is regularly carried in stock and the duty free price printed for the 
 convenience of those entitled to it. 
 
 DUTY FREE IMPORTATION SERVICE— Under Paragraphs 573 and 654 of the Tariff Act of 1913 apparatus of 
 foreign origin may be imported for Educational Institutions free of U. S. Customs duties under 
 certain regulations established by the U. S. Treasury Department. The conduct of such importations 
 is a special feature of our business and we believe our service in the carrying out of the many techni- 
 calities required is a great convenience to our customers. Duty free importations through our medium 
 are usually handled at less expense, frequently at some saving in time and always with much less trouble, 
 than when orders are placed directly. Duty Free prices f.o.b. Philadelphia on general lists of apparatus 
 can not be printed either in our catalogue or on our discount sheet as ocean freights on such goods are 
 mostly paid by the cubic meter and the delivered rate per unit of foreign currency depends, therefore, 
 directly upon the relation between the bulk and value of any given shipment. All duty free quotations 
 are made subject to the rulings of the Collector of the Port at which entry is made and the prevailing 
 regulations established by the U. S. Treasury Department, and we do not guarantee duty free entry 
 under any circumstances. Under the present ruling of the U. S. Treasury Department, which has been 
 supported in the U. S. Courts, Hospitals, even when training schools for nurses are connected there- 
 with, may not import free of duty. 
 
 RETURN OF GOODS— Customers are requested not to return goods for any reason until after communication 
 is had with us. When the return is arranged suitable tags are sent which when attached to the articles 
 in question insure prompt credit, repair or exchange, as indicated. The time involved in such pre- 
 liminary arrangement is insignificant compared with the time and labor required to establish the iden- 
 tity and disposal of goods sent us without such precaution. 
 
 SHIPMENTS — Where no instructions are furnished with order we exercise our own judgment as to method of 
 shipment, i.e., via rail, boat, parcel post, etc. All shipments are made in accordance with the regulations 
 of the Interstate Commerce Commission and insurance only effected when specific directions are given, 
 except in parcel post shipments which are automatically insured against both loss and breakage under 
 a blanket policy, the small charge for such insurance being included on bills. 
 
 Our business is confined to the buying and selling of Apparatus and Reagents, mostly within the limits 
 mentioned on the title page of this catalogue. We are not scientists, inventors or manufacturers and we are 
 not equipped to design and experimentally develop scientific apparatus. We believe such work is properly done 
 by the scientist in his laboratory, the manufacturer in his shop, or by the two in cooperation and that the function 
 of the dealer advantageously begins only after such work is completed. We are ready whenever possible to 
 facilitate cooperation between the scientist with ideas for development and selected manufacturers with facili- 
 ties applying thereto. We own no patents, have part in no monopolies and all of the merchandise offered 
 herein is obtainable either directly from the makers or through other dealers whenever our services fail in their 
 operation toward the convenience, economy and general satisfaction of the purchaser. 
 
 A preface applying specifically to our business in Reagents is printed with the Reagent section of this Catalogue. 
 
 ARTHUR H. THOMAS COMPANY. 
 
Bausch & Lamb Optical Company Works 
 
 BAUSCH & LOMB OPTICAL COMPANY— Under an arrangement in successful operation for the past fourteen 
 years, we carry instock in Philadelphia a complete line of Microscopes, Microtomes, Projection and 
 Photo-Micrographic Apparatus as manufactured by the Bausch & Lnmli ()plic;il Company, of Rochester, 
 N. Y. We distribute these products in Pennsylvania, New Jersey- iiiid tlic Sniithern states, at original 
 factory prices, thereby saving customers in this territory both tinir anrl transportation expense. 
 While nearly all of these goods are listed in this catalogue, M'e have fur free distribution the following 
 original Bausch and Lomb catalogues in editions specially prepared for us. 
 
 Microscopes and Accessories Photo-Micrographic Apparatus 
 
 Microtomes Projection Apparatus 
 
 CARL ZKLSS, JKNA 
 
 .\ll 
 
 firm of '.':■! I /. i ■ ■ ■ n ■ i ■ 
 
 ment of tln'M iH.-ilr ,i i i<,ii 
 
 States and imii ,-l ■ i ,, i 
 
 catalogues anti p:nji|ihli.'i m a^ iiili 
 
 Mikro 184. Microscopes and Accessories. 
 
 Mikro 227-231. Ultra-Microscopy and Dark- 
 ground Illumination Apparatus. 
 
 Mikru 264. Photo-Micrographic Apparatus. 
 
 Mikro 239. Large Projection Apparatus. 
 
 Mikro 170 and 2.34. Photo-Micrographic Outfit 
 for Ultra-Violet Light and Supplement to 
 same. 
 
 been direct importers of all Zei.ss pi'oducts a.s applied to laboratorv 
 
 ■"■■I" f' '■ 11 ■■li:ite delivery a large assortment of -Aiicrnscopes and 
 
 ■I !■ ■ I'tc, at factory prices plus duty and triinsjjortation. 
 
 ■ ' I" ■ ■■ ■'"' bandied by us at the minimum rate of 25^ per Mark, 
 
 -1.; -, I. ii(i[.l,'. Is andreprints of scientific articles published by the 
 
 -^unct addition to scientific literature. We carry a complete assort- 
 
 iid for immediate distribution free of charge to scientists in the United 
 
 le a complete list thereof. We mention some of the more important 
 
 Mikro 243. Epidiascope fur the Projection of 
 Opaque Objects, Microscopic Objects and 
 Lantern Slides. 
 
 Mess. 160. Optical Measuring Instruments. 
 
 Mess. 16.5. Dipping Refractometer. 
 
 Mess. 172. Abbe Refractometer. 
 
 Mess. 173. Butter Refractometer. 
 
 Mess. 188. Pulfrich Refractometer. 
 
I.MPORTATION SERVICE FKO.M SPECIFIED EUROPEAN MAKERS 
 
 An important feature of our business is the importation service from specified European manufacturers of 
 scientific instruments whose catalogues we supply to intending puroh.Tsrr.s nnd whnso, goods we furnish at net 
 
 factory prices plus our actual coat of impuci.r I..11 ■■,-. lir;, ■- i - 1 li -i.ni' !■ .:[■ 1 ■■i,i"\ less than when orders 
 
 are placed directly. This service is for ol>\ i' 1- n , - ■ 1 n L ,■■. hIi . .■! 1 ■ . .,|.. I, 1 1 our business as described 
 
 on the title page of this catalogue and we j 1 1 . 1 1 ■ ■ ■ 1 ■ ■ 1 I ■ ■ 1 1 ■ .1 ! . 1 y from over seven hun- 
 dred European manufacturers. Our proliL on iJuporLLdnHi ui'lii.-. 1 1 m. .■ , In .1 i 1-. is confined to the dis- 
 count allowed us by the maker and in no case do vvc advanct; tlie i. 1 1 ... ■ .1 hy the addition of U. S. 
 
 Customs duty in duty paid importations, and in all importatioji-^ I., M.i inh . i.,ii . .1 i.ransportation charges. 
 We mention below a few European makers of reputation whose i.n ■! m^i..'^ .n ■■ 1 . ^nlir K supplied us for distri- 
 Imtion. 
 
 Eugen Albrecht, Pliy,siuli)f;ic;i.l App.^itnl uy uCLer llurthle, etc. 
 
 Montaudon, Au/iou\ ilodels of llumaa and Comparative Anatomy. 
 
 R. Brendel, Botanical and Zoological Models. 
 
 Cambridge Scientific Instrument Co., Electrical Measuring Instruments, Uuddell Oscillograpli, Ein- 
 thovcn Galvanometers, Electro-Cardiographic Apparatus, ete. 
 
 Deyrolle et Fils, Models of Human and Comparative Anatomy, and other Anatomical Preparations. 
 
 Dr. Th. Edelmann, Electrical Measuring Instruments, Eiuthoven Galvanometers, Electro-Cardiographic 
 Apparatus. 
 
 Ferdinand Ernecke, General Physical Apparatus. 
 
 R. Fuess, I'etrographieal Microscopes, Goniometers, Refraetonieters, -Meteorulogifal Apparatus, Pre- 
 cision Thermometers, etc. 
 
 Robert Goetze, Apparatus for Physical Chemistry and Precision Thermometers. 
 
 Greiner & Friedrichs, Fine graduated and lamp-blown Chemical Glassware. 
 
 Dr. G. Griibler & Co., Stains for Biological Work. 
 
 Emil Gundelach, Fine Chemical Glassware, Vacuum Tubes, etc, 
 
 Hartmann & Braun, Electrical Measuring Instruments. 
 
 Chas. Hearson & Co., Ltd., Bacteriological Incubators and Paraffine Baths. 
 
 Adam Hilger, Ltd., Wavelength Spectrometers and Spectrographs, Refractometers, Interferometers 
 Goniometers, Spectrophotometers and Diffraction Gratings. 
 
 R. Jung, Physiological Apparatus, Microtomes, etc. 
 
 C. A. F. Kahlbaum, High Grade Chemicals and Reagents. 
 
 Max Kohl, Physical Apparatus. Comprehensive catalogue of .sn2 pp. 
 
 Fritz Kohler, Apparatus for Physical, Electro- and Photo-Chemistry. 
 
 Konigliche Forzellan-Manufaktur, Porcelain Ware for laboratory and manufactiuing purpoHes. 
 
 Dr. F. Erantz, Crystal Models and Mlneralogical Pieparations and Collections. 
 
 A. Eriiss, Spectroscopes, Spectrometers, Spectrophotometers, Colorimeters, etc. 
 
 F. & M. Lautenschlaeger, Bacteriological and General Laboratory Apparatus. A large general cata- 
 logue of 7-13 pages. 
 
 E. Lej'bold's Nach., Physical Apparatus, Gaede Vacuum Pump, ' '-af.Ar- MokT'iibu- Pnrnp, etc. 
 C. F. Palmer & Co., Physiological Apparatus. 
 
 Ph. Pellin, Polariscopes, Colorimeters, Spectroscopes, Lc Ciiateliei- Metalli.irfiie;d Mieroseope, etc. 
 
 Wilh. Petzold, Physiological Apparatus. 
 
 Pulsometer Engineering Co., Gerj'k Vacuum Pump. 
 
 W. G. Pye & Co., Physical Apparatus. 
 
 Carl Reichert, Polariscopes, Metallurgical Microscopes, etc. 
 
 Max Rtnck, Physiological Apparatus, 
 
 .\lb. Rueprecht & Sohn, Analytical Balances and ^Veights, 
 
 Gebr. Ruhstrat, Laboratory Resistances. 
 
 F, Sartorius, Analytical Balances, Microtomes, etc. 
 
 Schmidt & Haensch, Spectroscopes, Spectrometers, Pulaiisfopo^^, Photometers, Spectrophotometers, 
 
 Colorimeters, etc. 
 Schott & Gen., Jena Laboratory Glassware. 
 Dr. Siebert & Kuhn, Fine Thermometers. 
 
 Societe Genevoise, Optical Measuring Instruments, Dividing Engines, Physical Apparatii.s, 
 Spindler & Hoyer, Apparatus for Physiology and Psychology. Radio-Chemistry eti-. 
 Steeg & Reuter, Mineral Preparations. 
 
 Tramond, Models of Human and Comparative Anatom}-, Osteological Preparations, 
 Otto Wolff, Electrical Measuring Instruments, Designs of the Physikalisch-Techiiischc Kcichs^anstalt. 
 Carl Zeiss, Microscopes and Optical Measuring Instruments (See Special AmiouTu'enifnt page IV). 
 E. Zimmerman, Apparatus for Physiology and Psychology. 
 
A very complete index is to be found on page 558 of the catalogue. 
 
 The arrangement of this catalogue is baaed upon convenience rather tlian consistency. All systematic 
 plans lead if completely carried out to inconvenient location of certain articles. The general arrangement is 
 alphabetical but in a number of instances the group system has been followed as a more convenient arrrangement. 
 
 GROUP ARRANGEMENT 
 
 Asphalt and Tar Testins 15 
 
 Bacteriological Apparatus 21 
 
 Cement Testing Ill 
 
 Charts 124 
 
 Crushing, Grinding and Pulverizing 161 
 
 Dissecting Instruments 181 
 
 Electro-Chemistry 195 
 
 Gas Analysis 245 
 
 Haematology 262 
 
 Measuring Appliances 290 
 
 Microscopes and Accessories 304 
 
 Microtomes and Accessories 343 
 
 Milk Testing 348 
 
 Mineralogy, Petrography, Crystallography, Etc . . . 352 
 
 Nitrogen Determination 364 
 
 Oil Testing 368 
 
 Photo-Micrography 337 
 
 Physical Chemistry 388 
 
 Physiological and Clinical Apparatus 398 
 
 Plant Physiology 416 
 
 Polariscopes and Accessories 424 
 
 Projection Apparatus 439 
 
 Radio-Chemistry 460 
 
 Spectroscopes and Accessories 492 
 
 Testing of Materials 525 
 
 Urine Analysis , 543 
 
 CONDENSED INDEX 
 
 Accutnulatora 
 
 ■ 66 
 
 Cai CeneraWrs 
 
 254 
 
 ReHEei.t Bottle-! 
 
 SO 
 
 Air Puii.ps 
 
 1 
 
 Regulators 
 
 2:,6 
 
 Refrit torn et era 
 
 465 
 
 ^mmoDia Apparatus rolin 
 
 043 
 
 r augi^ \ aouuni and Pressure 
 
 258 
 
 Retort* 
 
 474 
 
 \naerobip ( ulture Apparatus 
 
 
 GeoloEicdl and Miner tlogicil Appi 
 
 
 Rheo tats for Projection Apparatus 
 
 44S 
 
 Asbestos ( oofis 
 
 U 
 
 
 3i2 
 
 laboratory work 
 
 ■•03 
 
 \sphalt aii'l Tar Testing Apparatua 
 
 15 
 
 Glass Plates 
 
 41M 
 
 Ringi Concentric 
 
 475 
 
 A.utocla\es 
 
 
 Rod 
 
 260 
 
 for supports 
 
 475 
 
 Bactenoloaical Apiiaratus 
 
 
 Tubing 
 
 26U 
 
 Rubber Bulbs 
 
 476 
 
 Bahnces 
 
 46 
 
 C nduatcs 
 
 
 ■stoppers 
 
 477 
 
 Baloptiroiis ( Projection \pparat«s) 
 
 439 
 
 Cnndmg Appiratua 
 
 Ibl 
 
 Tubing 
 
 47S 
 
 Batteriei 
 
 fi6 
 
 Haem ac \-tometera 
 
 2b2 
 
 Rules 
 
 290 
 
 BfakeM 
 
 BS 
 
 Hiem'itolOE^ ^pparitus for 
 
 362 
 
 Saccharimeter-! 
 
 430 
 
 PHI f hw 
 
 71 
 
 Hardne" Te^ter^ 
 
 267 
 
 Sacchirometeri 
 
 543 
 
 Blower-. 
 
 73 
 
 Hear'wn Incubitor'i 
 
 24 
 
 Sand Bathi 
 
 4S0 
 
 Blowpipes 
 
 74 
 
 Hot Plate-. 
 
 268 
 
 Seilpels DLsaecting 
 
 ISZ 
 
 Botanicil Supplie'i 
 
 75 
 
 Hj drometera 
 
 271 
 
 Scoops 
 
 481 
 
 Bottles 
 
 75 
 
 
 274 
 
 =!haklng Apparatus 
 
 483 
 
 Brushes 
 
 S5 
 
 Ini.ubitor-< Barter loloi-inl 
 
 21 
 
 Sieves 
 
 486 
 
 Burette's 
 
 se 
 
 Embr\ologiral 
 
 29 
 
 lihcT Tubing 
 
 489 
 
 " Supports 
 
 90 
 
 Interferometer 
 
 471 
 
 Slides Micro 
 
 334 
 
 Burners 
 
 »1 
 
 Jars 
 
 276 
 
 Shde Ruk a 
 
 189 
 
 ralcium rhlonde C\lindcrs 
 
 Q9 
 
 \.ieldahl Apparatus 
 
 364 
 
 Sodium Press 
 
 438 
 
 Talon meters 
 
 101 
 
 ivmographi 
 
 399 
 
 Spitulas 
 
 490 
 
 Paaserole- 
 
 no 
 
 abels 
 
 2S3 
 
 Specimen Jars 
 
 27e 
 
 ( ement Teatinc \pparatus 
 
 111 
 
 ^mps Micro 
 
 3'1 
 
 Spectrographs 
 
 192 
 
 CentrituEfs 
 
 115 
 
 ecture Apparatus Hoffman 
 
 2n' 
 
 Spectrometers 
 
 192 
 
 Charts all kind-n 
 
 124 
 
 
 3'lb 
 
 '^pectrophotometer9 
 
 493 
 
 rhroijofraph 
 
 n9 
 
 
 2SQ 
 
 '^pectro3coppa and Accessories 
 
 492 
 
 rhrooometer 
 
 400 
 
 Measuring \ppliancci 
 
 390 
 
 Spoons 
 
 506 
 
 rhronosfopei 
 
 139 
 
 Metallic Tubing 
 
 343 
 
 fet lining Dishes 
 
 507 
 
 CHmps 
 
 140 
 
 Metal lographic Apparitus 
 
 
 Jara 
 
 507 
 
 Tolon meters 
 
 144 
 
 Meter Mirki 
 
 
 Sterpopticons (Projection Apparatus) 
 
 439 
 
 fombustion Boats 
 
 149 
 
 Micro=.r,H ir I A H==,n j 
 
 
 Stenluera 
 
 37 
 
 Furnai^s 
 
 237 
 
 Mii-rii III 1 1 M 1 1' 11 
 
 
 Stil! 
 
 186 
 
 Tmit, Vainer 
 
 150 
 
 Mii-r. .1 1 1 
 
 
 '^timng \pparatu'! 
 
 509 
 
 Tube-i 
 
 14*) 
 
 
 
 Stopcocks 
 
 510 
 
 Compressors Gas 
 
 151 
 
 MlTiil r 
 
 
 ''topmfchea 
 
 511 
 
 
 152 
 
 Milk le liij, A|ii 11 iiu 
 
 
 Storage Batteries 
 
 66 
 
 ' Supports 
 
 153 
 
 Milh 
 
 H,l 
 
 bupport"! 
 
 113 
 
 rondurtivit\ Cells 
 
 3«0 
 
 Mineralogii-il Colle, tions 
 
 S61 
 
 Si rlnges 
 
 516 
 
 Corks 
 
 154 
 
 MolecuHr tt eight Determination \ppa 
 
 
 Te't Glassp' 
 
 520 
 
 Borer'! 
 
 154 
 
 
 3SS 
 
 Testing of Matenils Apparatus 1 
 
 for 
 
 rover Glasaea Micro 
 
 ■'34 
 
 Mort tr. 
 
 363 
 
 (Pappr Leather Yarn Textile) 
 
 535 
 
 Crucibles 
 
 15fi 
 
 Motor-! 
 
 3t.2 
 
 Test Tubes 
 
 530 
 
 Tongs 
 
 ■,-iS 
 
 Muffles 
 
 3M 
 
 Supports 
 
 522 
 
 CrushiUE Appiratus 
 
 Ifil 
 
 Museum Jars 
 
 27fi 
 
 Thermometera 
 
 530 
 
 Cr\ stallization Dishes 
 
 
 Needles Dia-iei ting 
 
 132 
 
 Thermo regulators 
 
 536 
 
 Culture Diahea 
 
 170 
 
 Inopul-itinc 
 
 364 
 
 Tonga 
 
 53S 
 
 ■• Flasks 
 
 171 
 
 
 513 
 
 Tr^is 
 
 538 
 
 Cylinders 
 
 173 
 
 Nitrogen DLtcnniiiutifin ApjurLlui 
 
 "(14 
 
 1 nangles 
 
 539 
 
 Deiiriatom 
 
 175 
 
 Oil Teatiug Apparati •< 
 
 hS 
 
 Tnpods 
 
 541 
 
 DlH -.1 ^l 1 iiiti, TwrlJahl 
 
 364 
 
 Ovens Dning 
 
 ^74 
 
 Tubing Alundom 
 
 
 Di=!h 
 
 173 
 
 " Embedding 
 
 42 
 
 Glass 
 
 260 
 
 Di 1 1 
 
 181 
 
 Petri Dishes 
 
 170 
 
 Rubber 
 
 478 
 
 nisiii , , 1 
 
 222 
 
 PetroiogKal Collections 
 
 3bl 
 
 Silica 
 
 489 
 
 Di mil 1 1 1 11 
 
 136 
 
 Photometerv 
 
 ''=,2 
 
 Urea Apparatus Fohn 
 
 543 
 
 Dr^.nECKin-^ 
 
 374 
 
 Photo-Mirrograpliic \pparitiii 
 
 -.7 
 
 Tirine \nihsis ^ppa^at^ls 
 
 543 
 
 ' Tubes Calcium Chloride 
 
 99 
 
 Ph>°ioloEical and Clmiral -ipparatua 
 
 39S 
 
 ^ annum Di tilling Appiratus 
 
 190 
 
 Electro-Chemistr\ Apparatus 
 
 1Q5 
 
 Pinch cor ka 
 
 142 
 
 Drj ing Ovens 
 
 379 
 
 Electm-Ci rfli fieri phii- Outfita 
 
 410 
 
 Pipettes 
 
 413 
 
 riiska Deuir 
 
 224 
 
 EWtr,-^ - 
 
 4fi0 
 
 Supports 
 
 41i 
 
 Gauge 
 
 258 
 
 E.1,1 III <> 
 
 42 
 
 Plant Ph^^ioloei 
 
 416 
 
 
 
 Evii r , 1 
 
 m 
 
 riatinum Ware 
 
 420 
 
 \wls . ^"™^ 
 
 545 
 
 E^tr , ,111 
 
 206 
 
 Pher-! 
 
 423 
 
 Visoosi meters. Asphalt 
 
 15 
 
 Ferni . h 1 nl 
 
 200 
 210 
 
 Poljriscopes and ^ccessoriaa 
 Potish Bulbs 
 
 424 
 436 
 
 Blood ■..'.;;::;;;■ 
 
 267 
 
 Filti-r 
 
 Oil 
 
 370 
 
 Filti-r Appiritus 
 
 209 
 
 Precipitating Jara 
 
 232 
 
 Rubber 
 
 480 
 
 ' Fld«ks 
 
 "33 
 
 Preparation Jar^ 
 Pre^sea 
 
 276 
 437 
 
 Wash Bottles 
 
 219 
 
 ' Paper 
 
 Watch Gla^=ea 
 
 547 
 
 Pumpi 
 
 217 
 
 Pressure Gauge 
 
 258 
 
 Water Baths 
 
 548 
 
 Flasks 
 
 21S 
 
 Bl 
 223 
 232 
 
 Projection Apparitui 
 Pumps 417- 
 
 Filter 
 Pyrometers 
 Qunrt7 Ware Transparent 
 
 430 
 
 217 
 449 
 459 
 
 Water Stills 
 
 186 
 
 
 Weighta, Analytica! 
 
 62 
 
 " Dissecting 
 
 Wire 
 
 551 
 
 Funnels 
 
 ■' Baskets 
 
 522 
 
 " Supports 
 
 ■' Gauge 
 
 359 
 
 Furnai-p^ f a" and Elpctri:> 
 
 234 
 215 
 
 Radin-Chemistrv Apparatus 
 Reading Microaconea 
 
 460 
 290 
 
 " Gauze 
 
 551 
 
 Gas Analysis Apparatus 
 
 " Platinum ■■.■■ 
 
 420 
 
ARTHUR H. THOMAS LOMPANY 
 
 
 I usotl in caloriraetric determinations to absorb diffi- 
 
 20000. Absorption Blocks, of paper purified with acids 
 cult combustible liquids. 
 
 Height, mm 15 13 16 
 
 Diameter, mm 7 10 14 
 
 Per 100, net TTlO iTTo 1.1» 
 
 20004. Acetometer, Otto. For determining the percentage of acetic acid in vinegar, on wooden base 75 
 
 20008. Acid Basins, of porcelain. 
 
 Diameter, mm 115 130 155 
 
 Each l.lO 1^25 1.5» 
 
 20012. Acid Pitchers, of stoneware. 
 
 Capacity, cc 1000 2000 4000 8000 
 
 Each .30 .35 .60 l.OO 
 
 20016. Acid Pump, for drawing acids, ammonia, etc., from carboys and large containers. Afoot power blower 
 or other form of blast apparatus is necessary for use in connection with it 5.00 
 
 20020. Acid Pump, with force pump attached. Suitable for bottles and carboys with inside diameter of mouth 
 If to 2g inches 5.00 
 
 20024. Adapters, curved; light wall, lamp blown; for connecting retorts with receivers. 
 
 Length, mm 130 150 200 
 
 Diameter at large end, mm 22 30 40 
 
 Each 20 "' T30 ^TSS 
 
 20028. Adapters, straight; light wall, lamp blown. 
 
 Length, ram 130 150 200 
 
 Diameter at large end, mm _22 30 _ _40 
 
 Each ^20 .30~ """."35 
 
 20032. Air Pump, Vacuum and Pressure, of brass, nickel plated. Mounted on oak base, with chamber 16 
 inches long by 2g inches in diameter. With two valves and two nipples for inlet and outlet of 
 air 8.00 
 
 20036. Air Pump, "Geryk" No. 0, fast running type, with new patented improvements, with I| inch cylinder 
 by 5 inch stroke, with 7 inch plate and vacuum gauge ; giving a vacuum to .3 mm less than perfect 
 vacuum as measured by the MacLeod Gauge. All the ordinary phenomena can he produced, 
 such as the freezing of water bv evaporation, and other school work. 
 Duty Free ." . . 30.00 Duty Paid 36.00 
 
No.2l)0J0 No. 20044 
 
 20040. Air Pump. •'Gervk" Duplex No. 1. With 2 inch cylinder by 5 inch stroke. Specially designed for the 
 rapid iiroduction uf high vacua. The vacuum obtained is comparable with that given by a 
 Sprengel pump and is very much more rapid. Is suitable for exhausting incandescent lamps 
 and Roentgen tubes. 
 Duty Free 97.65 Duty Paid 117.20 
 
 20044. Air Pump. "Geryk" Duplex ; for power driving, fast running type, with new patented improvements. This 
 pump is specially designed for the production of high vacua in incandescent himp factories and 
 is widely used for this purpose both in the U. S. and Europe, Requires less power for operation 
 than any other form of vacuum pump. Supplied with a special vacuum stopcock, fitted with 
 screw plug for regulating admission of air, at extra cost as indicated. 
 
 Diameter of cylinder, inches 2 2] 3 -ik 
 
 Stroke, inches 2 '' _ ' _ ' 
 
 Duty Free 126.00 157.50 252.00 315.00 
 
 Duty Paid 151.20 189.00 302.40 378.00 
 
 Extra for stopcock. Dutv Free 4.75 6.30 9.45 11.00 
 
 Duty Paid 5.70 7.60 11.33 13.25 
 
 20048. Air Pump, "Geryk," fast running type, with new patented im- 
 provements, will exhaust to within .3 mm on MacLeod 
 Gauge. These pumps are used for a variety of purposes in 
 both laboratory and manufacturing work and are, there- 
 fore, listed without plates. 
 
 Number , 1 2 3 
 
 Diameter of cylinder, inches. .. 2 2 2J 
 
 Stroke, inches _5 10 10 
 
 Duty Free 31. .50 47.25 66.15 
 
 Duty Paid 37.80 56.70 79.40 
 
 Vacuum Plates, onlv. 
 
 Diamot.or iiirli<'s.." S 9 
 
 Duty Free 7.90 11.35 Tl.SS 
 
 Duty Paid 9.45 13.60 13.60 
 
ARTHUR H. THOMAS COMPANY 
 
 T(iat4i, 
 
 20052. Air Pump, Gaede High Vacuum. Consists of an iron chamber half hlled with mercury in which a 
 porcelain drum rotates. This pump will exhiuist a 6 liter flask after it has been brought down 
 to a vacuum of 10 mm by preliminary exhaust (by means of a filter pump or preferably with 
 Gaede's Rotary Pump No. 20056) to .004 mm in 5 minutes, to .0001 mm in 10 minutes and to 
 .00001 mm in 15 minutes. See Gaede, Phy si kali ache Zeitsckrift. 1907, VIII, p. 852. Complete 
 with new patented valve drum and glass connection, but without mercury. 
 Duty Free 120.00 Duty Paid 160.00 
 
 Air Pump, (Jaede Rotary. Particularly recommended for use as an auxiliary pump in creating 
 the preiiniiiiary vacuum necessary with the Gaede High Vacuum Pump. This pump works dry 
 by means of a valve placed eccentrically in a metallic case. This pump is equally suitable for 
 the production of blast as well as vacuum and on this account has wide application in laboratory 
 work. It will evacuate a 6 liter flask from 1 atmosphere to 3 mm in 1 minute, to .04 mm in 2 
 minutes, to .15 mm in 3 minutes, to ,035 mm in 8 minutes, to .012 mm in 10 minutes and to .006 
 mm in 15 minutes. As a pressure pump it will give a pressure of 1 atmosphere above the pres- 
 sure of the atmosphere in which it is operated. For hand driving. 
 Duty Free 186.00 Duty Paid 248.00 
 
 Air Pump, Gaede Rotary, with Electric Motor. Same as 20056 but mounted on base board with elec- 
 tric motor of 5 h. p. and starting rheostat. ]\lotor arranged for continuous operation. Voltage 
 must be specified in ordering. 
 
 Current Direct Alternating 
 
 Duty Free 195.00 2io700~ 
 
 Duty Paid 260.00 280.00 
 
ARTHUR H, THOMAS COMPANY 
 
 No. 20064 
 
 Air Pump. Combination Outfit, consisting of Gaede High Vacuum and Gacdc Rotarj- Pumps, the latter 
 mounted on same base with electric motor. By means of belt connection the pumps are op- 
 erated simultaneously by the same motor Voltage must be specified in ordering. Motor sup- 
 plied with this outfit is not intended for continuous operation. 
 
 Current Direct Alternating 
 
 Duty Free 300700 330.00 
 
 Duty Paid 400.00 440.00 
 
 No. 20068 
 
 Air Pump, Gaede Molecular. A new high vacuum pump which removes all vajjors as well as 
 sases. Will exhaust a 6 liter flask starting with a pressure of 10 mm and using the Gaede Ro- 
 tary Pump as an auxiliary, to .0003 mm in 2 minutes, to ,00001 mm in 3 minutes and to .000002 
 mm in 4 minutes. In other words, this pump will exhaust to the same degree of vacuum in 3 
 minutes that the Gaede High Vacuum Pump reaches in 15 minutes. The Molecular Pump is built 
 on an entirely new plan, being without piston of any kind and the communication between the 
 receiver and the primary vacuum through the grooves and channels of the pump is at no time 
 closed. The movement of the rotor acts on the movement of the gas molecules in the grooves 
 of the rotor or the casing and produces a region containing fewer molecviles, i.e., a vacuum, at 
 the suction nozzle of the pump. This pump requires an electric motor with a speed of 3000 
 r. p. m. and a pulley 135 mm in diameter to give the required speed, i, e., SOOO r.p.m. Pump 
 only, without motor. 
 Duty Free 198.00 Duty Paid 264.00 
 
20072. Air Pump, Gaede Molecular with Electric Motor. Same as 20068 but with electric motor and 
 starting rheoatat mounted on same base with pump. Voltage must be specified in ordering. 
 
 Current Dire ct Alternating 
 
 Duty Free SOOToo" 330.M " 
 
 Duty Paid 400.00 440.00 
 
 Xote.— The Gaede Molecular Pump should always be backed by another pump which will exliaust into 
 the atmosphere in order to secure maximum effect. In practical work in the manufacture of 
 Roentgen tubes the Gaede pump is frequently backed by such a pump as the McNeill Rotary, 
 which is in turn backed by a piston pump such as the Geryk, such a series being very much 
 more efficient and rapid when so arranged. 
 
 2007(i. MacLeod's Vacuum Gauge for use with Gaede and other apparatus. 
 
 Duty Free 24.00 Duly Paid 35.20 
 
 Air Pump, Crowell Rotary Type O-D, will exhaust to a vacuum of from 29 to 30 inches of mercury and 
 can be used either totally immersed in oil in the oil box or without the oil box as shown. 
 The capacity of this pump is 2 cubic feet of free air per minute. The inlet and outlet tubes 
 are tapped for |-inch pipe size and about \ h. p. is required for operation; weight with the oil 
 box 50 lbs., without oil box 20 lbs. As used in many college laboratories and in the Nutrition 
 Laboratory of the Carnegie Institution of Washington. Can be used for blast as well as suction. 
 
 Complete with oil box 45.00 
 
 Air Pump. Crowell Rotary Type O-D, as ahnve. hut without oU box 35.00 
 
ARTHUR H. THOMAS COMPANY 
 
 20084. Air Pump and Compressor, Crowell Rotary. Exhausts under ordinarj- conditions of atmospheri; to 
 a vacuum of 29 or 30 inches of mercury. Can be used for pressure or blast up to 25 lbs. tn the 
 square inch. There are no valves, springs, gears or unbalanced parts and the direction of rota- 
 tion is not alternated when changed from use as a compressor to a vacuum pump. Very satisfac- 
 tory for supplying suction throughout a laboratory for filtrationg, etc., or air pressure for blast 
 lamps. For illustration of receiver, see page 73. In ordering please state whether receivej- is to 
 be included 
 
 1-n 
 
 1.1 
 
 4 3 
 
 500 
 
 i 
 
 6-\ 
 
 :;-l) 
 
 40 
 
 0.2 
 
 400 
 
 1 
 
 Sx 
 
 S-l) 
 
 100 
 
 17.0 
 
 300 
 
 
 12 .\ 
 
 4-1) 
 
 »() 
 
 40.5 
 
 250 
 
 4 
 
 14 .N 
 
 •i-i) 
 
 400 
 
 46.0 
 
 200 
 
 5 
 
 ISx 
 
 6-D 
 
 600 
 
 6!) 4 
 
 200 
 
 61 
 
 ISx 
 
 - 
 
 ^ 
 
 ^ 
 
 13 X l.S 
 
 .540.00 
 
 .ss.oo 
 
 14 X 22 
 
 60.00 
 
 8.00 
 
 19 x34 
 
 90.00 
 
 10.00 
 
 23 X 3.S 
 
 150.00 
 
 10.00 
 
 26x44 
 
 170.00 
 
 IS. 00 
 
 26 X 55 
 
 225.00 
 
 IS. 00 
 
 Air Pump, McNeill Rotary, for High Vacuum. When pruperlv backed bv a ininip exhaustini; Into 
 the atmosphere produces a vacuum of .0003 mm and under favorable circumstances will do 
 even better ._ This pump is widely used in the manufacture of tungsten and other electric lamps 
 and, as it will not exhaust directly into the atmosphere, must be backed by a pump producing a 
 vacuum of at h^ast 1 mm of mercury. In lamp factories a Geryk pump is frequently used for 
 this purpose. The McNeill pump is also used in the manufacture of Roentgen tubes, etc., as 
 an auxiliary to the Gaede -Alolecular Pump, in which combination it must also be backed by a 
 
 pump exhausting into the atmosphere lOO'.OO 
 
 Special Oil, per gallon j.OO 
 
 Note — Five gallons of the special Oil should be purchased with each Pump. 
 
 Air Pump Plates, on tripod base, with heavy plate glass top and two-way stopcock. \\'ithout bell 
 jar. For Bell Jars suitable for use with these plates see No. 21920. 
 
 Diameter, mm 200 250 300 
 
 Each 10.00 12.00 15.00 
 
ARTHUR H. THOMAS COMPANY 
 
 I i il If 
 
 No 20104 No, 20108 No. 20112 No. 20116 
 
 20<I96. S\\ Sampler for Taking Dust and Bacteria Samples of Air. This apparatus consists of a ■}„ b. p. motor, 
 i.'il.lii.'r alternating or direct current, driving a small vaWeless suction pump, which draws air 
 at a constant rate from a receiver, the receiver being placed between the meter and thepump, 
 to take up pulsations from the pump. The meter is of the Venturi type, calibrated empirically 
 to read in "Air -minutes per three c.uljic feet," or in cubic feet per minute or any unit desired. 
 .\. special glass cone for holding the filtering medium is inserted in a rubber gasket in the metal 
 cone shown at the top of the apparatus. The apparatus is nickel plated, compact, neat in appear- 
 ance and very durable and reliable in operation. The cabinet is 9 inches wide, 8 inches deep and 
 13 inches high, total weight 25 lbs. As used by Baskerville and Winslow for investigations of the 
 air in school-rooms in New York City. See Journal nf hiclu:-</rii'l mid Engineering Chemistry, 
 
 Miirrh. 1914 75.00 
 
 21)100. Air Tester, Wolpert, for the determination of CO3; complet'/ with iiiTCKs:ir\ reusents in eight bottles 
 
 in carton 6.00 
 
 20104. Alkalimeter, Schroedter, without tube in flask 1-50 
 
 20108. " " with /[ " " 1.80 
 
 20112. " Geissler, with ground joints 2.00 
 
 20116. •' " " " " new form . 2.00 
 
 20118. Alundum Refractory Cement, for use in connection with muffies, cores and wherever Cement with high 
 thermal conductivity is desired. A dry powder which when mixed with sufficient water makes 
 a thick paste ready for application. Very suitable for use as a protection to wire resistances in 
 electric furnaces. For ordinary work Mixture RA 162 is suitable. Where a finegrain cement 
 is required Mixture RA 355 is recommended which has the same physical properties. Where a 
 vitrifying point of approximately 500°C is desired Mixture RA 305 is recominended. Prices are 
 the same for all mixtures. 
 
 In lots of, lbs 1 5 10 2,5 50 
 
 Per lb .30 .15 .13 .10 .08 
 
 20120. Alundum Tubes, These tubes are porous but can now be glazed gas-tight without sacrificing their 
 refractive quality as they are regularly listed under combustion tubes. Such glazing adds 10% 
 to the prices given below up to and including U inch bore, up to and including 3 inch bore 157o 
 and all sizes over 3 inch bore 20% additional. When these tubes are used for furnaces of the 
 wire resistance type the resistor should be covered with Alundum cement as in the case of cores 
 or muffles. Lengths shorter than 12 inches can be furnished in multiples of 3 and 4 inches at 
 prices equally proportional to the next higher list. The mixture used in these tubes is RA98. 
 
 2.00 
 
 4. .50 
 
 Bore, inches. . 
 
 Wall, inches J 
 
 Each, 12 inches long 2.00 
 
 Each, 18 inches long 3.2.5 
 
 Each, 24 inches long 4.50 
 
 Bore, inches 
 
 Wall, inches . 
 
 Each, 12 inches long 
 
 Each, 18 inches long 4.25 
 
 Each, 24 inches long 5.85 
 
 H 
 
 2.60 
 
 2.00 
 
 2.00 
 
 2.10 
 
 2.20 
 
 2.40 
 
 3.25 
 
 .?.2.) 
 
 3.40 
 
 3.50 
 
 3.90 
 
 4..50 
 
 4.50 
 
 4.70 
 
 4.95 
 
 5.40 
 
 
 3 
 
 4 
 
 
 
 6 
 
 f 
 
 3.60 
 
 4.40 
 
 1 
 5.20 
 
 i 
 
 2.80 
 
 6.00 
 
 4.55 
 
 5.85 
 
 7.15 
 
 8.45 
 
 9.75 
 
 6.30 
 
 8.10 
 
 9.90 
 
 11.70 
 
 13.50 
 
 Ampoules, of Jena Fiolax Glass, which may be identified by a dark longitudinal stripe. These 1 
 poules are of the shape and sizes used by the U. S. Army in the preparation of typhoid vacc 
 and by many other laboratories in the dispensing and administration of vaccines and other 
 biological products. Ampoules in amber glass and of other sizes and shapes imported to order. 
 Special prices for large import orders, both duty free and duty paid, on application. 
 
 Capacity, cc 1 2 5 10 25 
 
 Per 100 1.45 2.00 2.55 3760 7.05 
 
Nj >iin Fi 
 
 No. 20148 Fig. 2 
 
 20136. 
 20140 
 20144. 
 20148. 
 
 20152. 
 20156. 
 
 20164. 
 
 20168. 
 
 Anaerobic Culture Apparatus, Kiister, ronsistiuf^ of a glass absorption capsule, 120 mm in diam- 
 eter by 15 mm high, entirely closed over with the exception of a small hole in the top. Absorb- 
 ent material such as pyrogallic acid, etc., is placed in the dish to a depth of about 5 mm. The 
 Petri dish containing the culture is then placed over the opening in an inverted position and 
 sealed down with plasticine. When the usual 100 mm Petri dishes are used, about 150 cc of air 
 must be absorbed by the acid. Two parts of sodium hydrosulphite or pyrogallic acid are dis- 
 solved in 20 parts of distilled water and poured into the absorption capsule and, just before 
 ptaciog the Petri dish above the capsule, 20 cc. of a 10% solution of potassium hydroxide is added. 
 Absorption takes place very rapidly because of the large absorbing surface and may be hastened 
 by slight shaking. See Centralblatt f. Bakt. Referate S7 Bd. No. lJ^-22, p. 269-271. Absorption 
 capsule only .40 
 
 Anaerobic Culture Apparatus, Lentz, consisting of a 125 mm square glass plate- and a cellulose 
 absorbent ring. The Petri dish containing the culture is placed in an inverted position over the 
 cellulose ring after same has been soaked in pyrogallic acid, the dish being sealed to the glass 
 plate by means of plasticine. Immediately before using the cellulose ring should be moistened 
 with 1% potassium hydroxide. The rings are 85 mm in diameter, being intended for conven- 
 ient use with a 100 mm Petri dish. See Centralblatt f. Bakt., 1910, Bd. 53, 1 & 3. 
 
 Cellulose Rings, as described, per box of 10 2.00 
 
 Glass Plates, 125 mm square. Each 06 
 
 Plasticine, in conveniently shaped rods. Per box of 25 rods 1.25 
 
 Anaerobic Culture Apparatus, McLeod, consisting of two parts, a porcelain capsule to contain the 
 pyrogallic acid and caustic soda solutions and a special Petri dish which has its free margin 
 turned inwards and upwards. The porcelain dish is a hollow chamber. It is bisected in the 
 lower two-thirds of its depth by a vertical partition and there is a circular aperture in the center 
 of its upper surface. Around the margin of the upper surface is a small groove which is filled 
 with plasticine. In using the apparatus 5 cc to 7 cc of a 15% solution of pyrogallic acid is run 
 into the compartment of the chamber marked A in Fig. 2. This can most easily be done with 
 a large pipette, 5 cc to 7 cc of a 10% solution of caustic potash is then introduced into compart- 
 ment B. The Petri dish is then pressed down into the plasticine in the groove and the plasticine 
 is pushed up against its outer margin to insure the proper sealing of the chamber. As soon as 
 the access of fresh oxygen from without has thus been cut off, a mixture of the pyrogallic acid 
 and caustic potash solutions is effected by tilting the porcelain dish so that the solutions run 
 over the partition at the point K in Fig. 2 and react with one another. The Petri dish is shown 
 in Fig. 1 ready for use in contact with the plasticine. Any condensation water which may form 
 is retained in the groove R. See Journal of Pathology and Bacteriology (Brilisk). Vol. 4, April 
 
 1913, p. 45/f Complete with both porcelain dish and special Petri dish 1.25 
 
 Porcelain Capsule, only 1,00 
 
 Special Petri Dish, only 25 
 
 Note.— For Plasticine see No. 20144. 
 
 Anaerobic Culture Apparatus, Novy, with removable top permitting the use of Petri dishes. For use 
 by either gas or pyrogallate methods. The two sections have wide ground flanges which, with 
 the rubber bands, form an air-tight connection when held in place by clamps. The lower section 
 is 150 mm high by 140 mm in diameter. Glass parts only, with rubber band but without metal 
 clamps. 4.50 
 
 Anaerobic Culture Apparatus, Novy, same as No. 20160 but with clamps 5.00 
 
 *' " " " improved form, for the culture of anaerobic bacteria by either 
 
 vacuum, gas or pyrogallate methods. With stopcock supported horizontally by glass tubes 
 above the regular stopper, relieving^ the large stopper from pressure and thus permitting the 
 use of the vacuum method. Otherwise identical with No. 20160. Glass parts only, with rubber 
 
 band but without metal clamps 5.50 
 
 Anaerobic Culture Apparatus, Novy, same as No. 20168 but with clamps 6.00 
 
ARTHUR H. THOMAS COMPANY 
 
 Model of Man n th di sectible heart, ett 
 Dut) Fret- '-I >0 00 
 
 ^) K ^'4 
 
 ii r ' '©^ ® 
 
 Development of Chkk 
 
 Model of House Fly 
 
 .$15.00 
 
 Fundamental Ovule Formations in Angiosperms 
 
 Duty Free $18.00 Duty Free. . . 
 
 ANATOMICAL MODELS, illustrating Human and Comparative Anatomy, Embryology, Botany, Pathology, Veter- 
 inary Science, etc. Our experience in the importation of models and natural history specimens is 
 extensive and we offer prospective customers the original catalogues of the leading European manu- 
 facturers in these lines. As practically all of our sales are to institutions entitled to duty free impor- 
 tations, it is not practical to carry the goods in duty paid stock and our experience indicates that 
 customers prefer to order directly from manufacturers' catalogues which are sent upon request. 
 
20176. Anemometer for the measurement of air currents through mines, tunnels, sewers and [n the ventilation 
 .shafts of hospitals, schools and other public buildings, \yith four dials reading to 100,000 ft. 
 and with zero setting attachment. Best London make 30.00 
 
 201Slt. Anemometer, Biram pattern, with r.,iir II ,1- ,,■. .lii-_ !.> 100,000 ft. Best London make 28.00 
 
 201S4. Animal Balance, for convenienth .'I^I.k.j . i ..i in the bacteriological laboratory. A decimal 
 balance, very sensitive, witl i ■ il . ,i n ,,l pan and tare weight for same so that balance 
 can be used for other purpo^u- i. .i|ii.:ii} _'!.) , lii.--. Without weights 18.00 
 
 201 NS. Animal Board, of wood, with hooks in each corner. Very convenient for animal experiments. Small 
 size is intended for guinea pigs and rats and the larger size for small dogs, cats, etc. 
 Length, mm 320 
 
 Width, mm 200 
 
 Each l'.50 
 
 Animal Cage, extra heavy, with removable drawer, feeding trough, etc. 
 
 Height, mm 300 
 
 Length, mm 400 
 
 Width, mm 300 
 
 Duty Free "llVsS 
 
 Duty Paid 14.00 
 
 .WO 
 3.00 
 
 450 
 600 
 ^00 
 15.50 
 18.80 
 
 Animal Cage, Heim. Designed specially as a breeding cage for mice, with two compartments, 
 etc. Of wood with metal fittings, 500 X 300 X 300 mm. 
 Duly Free 11.10 Duty Paid 13.45 
 
20212. 
 20216. 
 
 \nimal (.age Abderhdlden Deai^ned specially for metabolism experiments, etc. The sides and 
 back aie t ^Mrc s,li&o, Mth ijors of plate glass. A perforated bottom, easily removable for 
 cleaning, supports the animal over the conical bottom for collection of urine, etc. Heavily made 
 throughout. 
 
 Height, mm 600 700 800 
 
 Length, mm 600 700 800 
 
 Width, mm fiOO 700 800 
 
 Duty Free 44.55 48.85 52.80 
 
 Duty Paid 54.00 59.25 64.00 
 
 Animal Cage, Phipps Institute Model, as designed by Dr. Paul A. Lewis. Of heavy galvanized sheet 
 iron. The new feature of these cages is the arrangement for bolting together the units in 
 stacks of two, four, etc., as shown in illustration. Height 14 inches, length 14 inches, width 16 
 
 inches 5.00 
 
 Supports only, for above, Ql in. high, each 1.50 
 
 Animal Cage, Vaughan. Collapsible for convenience in sterilization or storage, the sides, top and 
 bottom being in separate parts. Height (not including legs) 12 inches, total height 17 inches, 
 length 20 inches, width 15 inches 8.50 
 
 Animal Holder, for mice. Made entirely of metal; for inoculating mice; with adjustable clamp for 
 holding the tail of the animal. The conical wire cage is detachable 1.25 
 
 Animal Holder, Kitasato, for mice; nickel plated metal plate with spring clamp for fastening the ani- 
 mal by the skin of the neck and a spring clip for holding the tail or leg. The plate may be sup- 
 ported in any position by ball and socket joint 4.00 
 
 Animal Holder, Voge, for guinea pigs. Useful for taking temperatures, inoculations, etc. Of zinc. 
 
 Height, mm ISO 200 
 
 Diameter, mm 60 80 
 
 Each .60 " .75 
 
 Animal Jar, for mice, consisting of glass battery jar 5x7 inches with wire mesh top and weight. . 1.25 
 
No. 20228 f^o. 2m2 
 
 Animal Jar. Thu snmlier sizes arc intended for mice and the larger sizes for guinea pigs and rabbits. 
 Top IS made of heavy galvanized wire with weight. The same jars may be fitted with close- 
 iitting tops of mosquito and flea proof gauze at an additional price. For prices of jars only, 
 see Aqua- n No. 20276. 
 
 Height, inches 7 10 12 
 
 Diameter, inches 8^ 11 16 
 
 Each 2T75 "4.75 UM 
 
 Animal Head Holder, with clamp, large mode! for dogs, jaws upholstered with leather. 
 
 Duty Free 17.2.5 „ Duty Paid 20.80 
 
 N«. 20240 
 2023ti. Animal Holder, Tatin. nf niHal, for guinea pigs, rats, etc., with two head holders :ls shown in illustration 
 
 Duty Free 8.95 Duty Paid 10.80 
 
 2024(1. Animal Holder, new model, of wood. With adjustable metal fittings on the sides for fastening the 
 
 i^„. T'v... *.,. .. ...,.„i.i„ f„. ^ gj.g^^ variety of work and is sufficiently adjustable to 
 
 legs. This apparatus is suitable for t 
 
 be used for either guinea pigs or dogs. Complete 
 
 Duly Free 24.75 
 
 Duty Paid 30.00 
 
 Animal Table, Brodie, with a top 51 x 18 
 inches, and 40 inches high. With 
 cleats for the easy attaching of the 
 holding cords. Near the center and 
 flush with the top is a copper hot 
 plate, 30x12 inches, heated by two 
 electric lamps, each having its own 
 independent switch. With two up- 
 right rods working in slots. At the 
 end is attached Dr. Brodie's anaes- 
 thetic bottle and air warmer (see 
 No. 43048) with a bent tube projecting 
 through the table to supply air to the 
 animal. Table is complete with ani- 
 mal holder, four control switches, 
 main switch and plug. Voltage must 
 be specified in ordering. 
 
 Duty Free 70.00 
 
 Duty Paid Rs.OO 
 
iff 
 
 Fire (.'l^y Company's make; of iine, white 
 
 hirgelj' used for 
 
 20252. 
 20256. 
 
 20264. 
 20268. 
 
 20270. 
 20272. 
 
 Annealing Cups, Den 
 
 silica fusions. 
 
 Number 
 
 Size, inches la- x Ij 
 
 Per dozen 1 .00 
 
 Covers, per dozen .25 
 
 Anvil, steel, with mirror polished face; 4^ inches long; weight 1 lb 1. 00 
 
 " '* " square, mirror polished face. Size of face, inches 1 _ 
 
 Each 765^ 
 
 Anvil, with vise. A well njade tool, very convenient in the laboratory. 
 
 Width of jaws, inches IJ- 
 
 Weight, lbs 1^ 
 
 Each 75 
 
 Aprons, laboratory; acid proof, light and pliable 
 
 Aquaria, oblong, of heavy, clear, white glass, without base. 
 
 Capacity, gallons 
 
 Length, inches 
 
 Width, inches 
 
 Height, inches 
 
 Each 
 
 Aquaria, as above, with base, each 
 
 Aquaria, rectangular, of plate glass set in wrought iron frame, with slate bottom. As furnished by us 
 to the laboratories of the U. S. Bureau of Fisheries. Boxing charged extra at cost. Special 
 sizes made to order; prices upon application 
 
 Length, inches 18 21 23J 29 
 
 Width, inches 105 1? 13* 17 
 
 Height, inches Hi 12 5 13 | 10 IS 
 
 Each 6.00 8.00 9.60 ' 16.00 20.00 
 
 Ijx U 
 1.00 
 .25 
 
 1.00 
 
 1.50 
 
 10* 
 6* 
 
 lOj 
 3.00 
 5.. 50 
 
 15- X Ij 
 
 1.00 
 
 .25 
 
 1.25 
 
 2t 
 
 9i 
 3.00 
 1.00 
 
 33 
 19 
 
 1.50 
 
 1.35 
 
 HI 
 
 2.75 
 3 
 
 6.00 8.00 9.60 
 
 Aquaria, high form, of heavy, clear, white glass; with ground rim and groove near top 
 
 extra except when ordered in original factory packages as indicated below. 
 
 Capacity, gallons 5 1 15 2 4 
 
 Height, inches 7 8| 
 
 Diameter, inches 6_ 7 
 
 Each .60 .90 
 
 Number in original case , . 18 16 
 
 Each, in original case 55 .80 1.12 
 
 Aquaria, low form, of heavy clear, white gl 
 
 extra except when ordered in original factory 
 
 Capacity, gallons i 1 
 
 Diameter, inches 7 8 
 
 Height, inches _4-| 5 
 
 Each .65 .85 
 
 Number in original case 18 12 
 
 Each, in original case 60 .75 1.12 1.65 
 
 00 
 11.00 
 
 21 
 
 21^ 
 
 32,00 
 
 :, with ground rim and groove near top. 
 as indu-ated below. 
 
 2 3 45 
 
 10 12 14 
 
 6i 75 Sj 
 
 1.25" 1.75 
 
 6 4 
 
 Boxing charged 
 
 16 
 8.00 
 
 Boxing charged 
 
 10 
 18 
 
 2.50 
 
20284. 
 202S8. 
 
 20292. 
 20296. 
 20;t0fl. 
 
 20308. 
 20312. 
 
 20316. 
 20320. 
 20324. 
 
 Arsenic Apparatus, Freaenius, for the detection of arsenic, without support.. 
 " Tubes, of Bohciiiiiin jiluss 
 
 Style .\ 
 
 Each 04 
 
 Arsenic Tubes, Transparent Silica, 3 inches 1 
 eter. , 
 
 : by 1^6 inch outside diameter with bulb 
 
 D 
 4 .04 
 
 inch diam- 
 .25 
 
 Asbestos Aprons, made of pure asbestos, canvas liaed, complete with strap and bucklo fasteners. State 
 size in ordering. A medium size is sent unless otherwise specified 7.50 
 
 Asbestos Board, in mill size sheets, 42 x 48 inches. The board is carried in stock in the following thick- 
 nessea for which approximate weights are given. On small orders, particularly when shipped alone, 
 necessary crating is charged extra at cost because of the small value of the article itself. 
 Thickness, inches ■ -h ^ T2 i A . I i 
 
 Weight, lbs 2 4 7" 10 13 18 24 35 
 
 Per lb 10 .10 .10 .10 .10 .10 AO ~ .10 
 
 Asbestos Board, in squares, for use under beakers, dishes, etc. 
 
 Thickness, inches -^ Jg ^ 
 
 Size, inches 4 5 6 
 
 Each 704 ^5~~ TOB 
 
 Asbestos Cement, ready for use. Per 5 lb. can 50 
 
 Asbestos Cord, with strong, hard-twisted strands; convenient in the laboratory for supporting retorts, 
 crucibles, etc., in contact with fire or heat; sizes ^th to |th inch diameter, in J lb. balls. Per 
 ball 50 
 
 Asbestos Gloves, with four fingers and thumb, made of asbestos cloth, with either asbestos or leather 
 
 gauntlet. Per pair 4.00 
 
 Asbestos Mat, circular, Sf inches in diameter, so-called "stove mats," with metal binding and ring 
 for hanging up; very convenient in the laboratory 15 
 
 Asbestos Mats, square, i inch thick, neatly bound with metal to prevent fraying at the edges. Very con- 
 venient for use on table top and under burners to prevent scorching of wood etc. Special sizes 
 made to order. 
 
 Size, inches S| x S| ^^ ^J} 9x14 15x15 10x16 12x15 14x24 24x30 
 
 Each 20 .30" .30 .40 .50 .50 .50 1.20 
 
 Asbestos Paper, of pure, white fiber, 36 inches wide. Cut any length. Per lb 20 
 
ARTHUR H. THOMAS COMPANY 
 
 20336. 
 20340. 
 
 20344. 
 20348. 
 
 20360. 
 20.564. 
 20368. 
 20372. 
 
 No. 2(«7J No. 20.11^ Nr. 20) ih 
 
 ASPHALT AND TAR TESTING APPARATUS 
 
 Penetrometer, Standard, New York Testing Laboratory Type, for measuring the depth of penetration 
 of a standard needle into the material to be tested at 77° F. or 25° C in 5 seconds of time under 
 a 100 gram weight; with standard clock reading in 5 seconds and dial graduated to tV min. A 
 set of adjustable weights is provided permitting the use of either 50 or 100 gram loads in addi- 
 tion to the standard of 100 grams. See "The Modern Aspkall Pai^ement" 60.00 
 
 Penetrometer, Miniature, exactly similar to the above but one-half the size and specially designed 
 for engineers' portable use in making comparative tests, without clock 25.00 
 
 Drying Oven, New York Testing Laboratory Type, for uniform temperatures, with fan in bottom and 
 10 inch ring burner; of copper with asbestos jacket, 20 inches high by 11 inches in diameter 35.00 
 
 Drying Oven, same as above, but of Russia iron 25.00 
 
 Asphalt Flow Plate and Mold, consisting of 3 plates each with four corrugations or 2 plates each with 
 six corrugations and one mold. Type of plate must be specified in ordering 5.00 
 
 Asphalt Viscosimeter, New York Testing Laboratory Type, consisting of a concave aluminum float with 
 three standardized brass plugs; for testing the consistency or the fluidity of bituminous binders 
 at 90°F 7.25 
 
 Note — P"'or testing the viscosity of bituminous compounds such as oils, or of asphaltic material at high 
 temperatures, i. e,, about 200° F., the Engler Viscosimeter is mostly used. See Oil Testing 
 .Apparatus. 
 
 Adhesion Machine, Kirschbraun-Sargent, a double scale dynamometer graduated in grams up to 250 
 grams and in ounces up to 8 ounces. Two sample cups are provided, one for the standard sample 
 and one for the unknown. As used in the Chicago Paving Laboratories 20.00 
 
 Briquette Mould for Asphalt 4.00 
 
 Cubical Brass Mould, with plate for melting point determination, ^ inch 4.50 
 
 Bitumen Holder, Draper model _. 3.00 
 
 Cementation and Ductility Machine, Eirschbraun, for determining the relative cementation valuea 
 of asphalt cements. May also be used for ductility and elongation tests under various con- 
 ditions of temperature and speed 100.00 
 
 Crucible, Royal Berlin Porcelain, of special shape, with large filtering surface, as used in the deter- 
 mination of soluble bitumen. Tloight 24 ram. width at top 4.5 mm, widtli at boltom 35 mm. . . .50 
 
20380. Duclility Machine. Smith, for h;nid power; made entirely of uietal with box heavily plated and enamel 
 painted, with right and left screws, slip nuts for carriage, etc., for tests up to 100 cminlength. 
 'Viic test is condii'.'ted at a standard speed of 5 cm per minute at a temperature of 77° F, 135.00 
 203S4. Ductility Machine, Smith, as above but with directly connected, direct current electric motor.. 175.00 
 2038S. Ductility Machine, Electric Motor Drive, Chew Patent, constructed entirely of metal. All exposed parts 
 covered by water are made of brass or bronze. Warping and rusting are entirely prevented. The mech- 
 anism is strong, simple, durable and easily operated. The operation is smooth, iiniform and accurate 
 and reduces the personal equation of the operator to a minimum. This machine is adapted to testing 
 ill tvpes of bituminous material which can be cast in moulds. 
 
 sible u 
 
 which the 
 
 e fines 
 
 i be teUed simultAneousU 
 
 >uld3 la 
 
 Ad- 
 
 II designed to allow the operator freedom of access to tlie platform and posts 
 r tno trarki one of which ia slotted for its entire length and serves au a guide, 
 r (rom chatter or vibration. The carriage ia operated by a single heavy screw 
 as not to obitruot the manipulation of t«3t apeiiimens. The carriage may at any 
 ■rew shift by means of a anaall hand lever, which operates a two piece nut, even 
 
 Tl 
 
 then 
 
 The II : I n ia a simple and unique device which 
 
 I IF-- \ 111 hrr timing device. It eonatitutes a novel 
 
 1 I 1 1 (luce ailjuHted it is always reliable and absolutely pre- 
 -i in flow of current during the test. Any such variation is at once 
 irrected 1 \ adjusting the rheostat lever so that the speed indicator 
 
 Op'ri I 1 r d temperatureatid attached to postson carriage and platform, the 
 
 rruac I-- 1 "-r E ., I Ir m tl n i r u jI il t II n t jr 13 then started and its speed regulated until the speed indicator reg- 
 isteTi e\acth faie centimptw^ per minut.p The nrri'ie'is then engaRed with the screw shaft while in motion. At the con- 
 clusion of the test the carrnge 11 ri '.engagr J from the icren ihaft and slid back to its original position. 
 
 Full directions for making the ductility test are furnished with every machine. When placing order, 
 be sure to state the type of current for which motor should be furnished. Price on application. 
 
 Extractor, New York Testing Laboratory Type, for analysis of paving mixtures containing broken stone. 
 The bituminous mixture should be warmed until it can be readily broken apart by hand, 
 without fracturing any of the stony particles; 500 grams of the disintegrated mixture should be 
 packed as tightly as possible in the wire basket and then covered with a disc of cotton or felt 
 of J inch to 3 inch thickness; 175 to 200 cc of carbon disulphide, carbon tetrachloride, chloro- 
 form or benzole is placed in the inside vessel in which the wire basket is suspended. Cool water 
 should be circulated through the inverted cone condenser which is also the cover of the apparatus 
 and not intended to fit tight. A 16 c. p. carbon filament incandescent lamp is the source of heat. 
 A 500 gram sample of the mixture should extract clean with carbon disulphide in about 3 hours. 
 From 200 to 300 grams of asphalt block or Topeka type mixture is a sufficiently large sample for 
 that type of mixture. After extraction, the solvent and matter removed from the sample during 
 the analysis should be burnt to recover any fine mineral particles which may have passed into 
 the extract. These extractors are made entirely of metal. Each, complete, but without incan- 
 descent lamp " 30.00 
 
2039<i. Hydrometer, Summer's Patent, for determining the specific gravity of asphalt, graduated from 0.85 
 to 1 3° it 25° (' , IS recommended by the Committee of the American Society of Civil Engi- 
 neers Outfit with bri'3a receptacle and fittings, with instructions for use 10.00 
 
 20400. Hydrometer, 'iame as No 2f>Wf but graduated from 0.950 to 1.100 10.00 
 
 ^:t_,r: 
 
 Dulin Rotarex, Large Model with Universal Motor, for samples of oOO or 1000 grams. The advantage of 
 using such a large sample will be readily apparent as it permits running samples which contain a 
 large mineral aggregate as found in asphaltic, concrete or bitulithic pavements. It is also advan- 
 tageous in securing a considerable amount of bitumen in the pavement which can be used for 
 tlae penetration test. The machine is directly mounted on top of a universal vertical motor 
 which is entirely enclosed in a cast-iron frame and operates on either 110 volts, 60 cycles, alter- 
 nating current, or direct current 110 volts. The motor is fitted with a speed control, and may 
 be used on 220 volt circuit with suitable resistance. The bowl in which the sample is placed is 
 of aluminum with a cover of aluminum. The outside bowl or shell is of copper and fitted with 
 a two-piece cover, the smaller of which is removed when adding additional solvent. All of the 
 special features of the smaller type No. 20408 are incorporated in this machine 125.00 
 
 Dulin Rotarex, Small Model, for determining the mineral aggregate in bitumen pavements. The asphalt 
 receptacle of aluminum has a removable cover but solvent can be added as required without 
 removing same. 'J'he solvent used is non-inflammable. Samples of 10, 25 or 50 grams may be 
 run with accurate results. The motor used may be connected to any 1 10 volt direct or alternat- 
 ing current (except 25 cycles or less). Time for extraction is 5 minutes, leaving the mineral 
 aggregate perfectly dry so that grades may be determined 60.00 
 
ARTHUR H. THOMAS COMPA N Y 
 
 No. 20J20 No. 20484 No. 20488 No. 20492 
 
 APPARATUS FOR TESTING COAL TAR AND REFINED TARS. OILS AND PITCHES DERIVED THERE- 
 FROM as adopted in the Standard Methods of tlie Barrett Manufacturing Company, New York. .See 
 Journal of Industrial and Engineering Chemistry, April, 1911, March, 1913, and Mai/, 1914. The 
 apparatus, listed below, is only the special apparatus required for these tests. The regular apparatus, 
 such as tripods, burners, clamps, etc., are to be found under their respective headings throughout the 
 catalogue. Complete lists of both the special and regular stock apparatus required for the various 
 tests will be sent upon request. 
 
 Special Apparatus required for Water in Tar Test 
 
 20412. Copper Still, with steel clamps, inside dimensions 6 x 3f inches, with six paper gaskets 13.25 
 
 20416, " " same as No. 20412. but larger size, i.e., inside dimensions 7J x 5 inches 17.00 
 
 20420. Ring Burner, brass, to fit small still No. 20412 1-90 
 
 20424. " " " ""large " No. 20416 3.25 
 
 20428. Connecting Tube, of glass 25 
 
 20432. Condenser Trough, of copper, on supports, witii wooden base 8.00 
 
 20436. " Tube, of glass, to fit Condenser Trough No. 20432 20 
 
 20440. Separatory Funnel, with stopcock, capacity 120 cc 3 .00 
 
 Special Apparatus required for Specific Gravitv Test 
 
 20444. Specific Gravity Bottle. Barrett modifiration of the Huhhard form, 50 cc capacity 90 
 
 Special Apparatus required for Free Carbon Test 
 20448. Extraction Apparatus, Barrett modification of the Cottle, or Underwriters' form. Complete with flask, 
 
 cover, coil and basket of German silver wire 3,50 
 
 20452. Glass Flasks, only, for above Extraction Apparatus 40 
 
 20456, Wire Basket, of rirmian silver, only, for above Extraction Apparatus .50 
 
 20460. Cover and Coil. i.f block tin, only, for above Extraction Apparatus , - - . 2.60 
 
 Special Apparatus required for Consistency of Refined Tars and Soft Pitch Test 
 
 20464, Schuftc Penetrometer, with one plug " 3.50 
 
 20468. Plugs, only, for above Penetrometer, each -25 
 
 Special Apparatus required for Melting Point of Pitch Test 
 
 20472. Pitch Mould, consisting of iron clamps with brass block , 5 . OO 
 
 20476. Thermometer, for melting point, etched on stem, 0- SO°C. in^ths 4.50 
 
 20480. '■ ■■ " " " " " 00-140°C. iniths 4. .50 
 
 Special Apparatus required for Melting Point of Hard Pilch Test 
 
 20484. Air Melting Point Oven, of copper, with mica window, removable tray, etc 10.75 
 
 Special Apparatus required for Evaporation Test 
 
 20488. Evaporating Dish, of pure nickel, with flange and handle 1 .90 
 
 Special Apparatus required for Slide Test 
 20492. Slide Box, <A copper, with six rornigafinns 7.00 
 
ARTHUR H . T H () M A 
 
 O M P A N Y 
 
 ^^ ^-^ 
 
 Special \pp iratus required for Light Oil Test 
 
 20496. Hempel Distilling Tube 30 
 
 Special Apparatus required for Standard Creosote Oil Distillation. 
 20500. Retort, Resistance Glass, 250 cc capacity. Made to special dimensions and with neck set at special 
 
 angle otherwise similar to regular retorts which, however, are not suited for this work 45 
 
 20512. Asbestos Sheet, specially. cut to fold into cover for retort ,50 
 
 20514. Thermometer, graduated from to 400" C in 1°. Made specially for this test 5.00 
 
 20504. Condenser Tube 35 
 
 Special Apparatus Required for Additional Creosote Oil Tests 
 
 20505. Separatory Funnel, with ground glass stopper and stopcock, graduated to 100 cc; Un- heavy oils. . 2.50 
 
 205I(>. Atom Models, Kekule-von Baeyer, consisting of 15 nicke! plated binding posts with two clamps, 
 20 black balls with four connecting posts, 10 red balls with two connecting posts, 30 white 
 balls, 10 yellow balls, 10 green balls, 10 violet balls, and 10 silver colored balls, each with metallic 
 tubulations to slip on posts. 
 Duty Free.. 13.50 Stock, , 20.00 
 
 20520. Atom Models. Eiloart, consisting of six wooden models, six straight pins, six hinged pins, forty 
 japanned tin caps, with formulae, etc. 
 Duty Free 18.00 Duly Paid 27.00 
 
 ^m 
 
 20524, Atom Configuration Models, Wislieenus, for organic chemistry; consisting of 20 models with wiro 
 
 supports; 5 cm size. Duty Free 20.00 
 
 Single Carbon Atoms for use in the construction of special formulae. Duty Free, per 100. 9.00 
 
ARTHUR H . THOMAS COMPANY 
 
 
 No. 211528 No. 21)536 No. 20544 
 
 Autoclave, or Digester, for 2,5 atmospheres pressure. Retrjrt is of li^imnered copper with lid of 
 phosplior ]>ri<i'y.'- Pressures given are the steam test pressures, the working pressures being 
 appro- >ni'. \v L''i , less. The working pressure is indicated on tlie manometer by means of a red 
 
 mark. W i'.l ' 'iinier. 
 
 Insidf liici.ii- ..ll^, mm 100x200 125x250 
 
 fapafily, hliTs I5 3 
 
 Duty Free . . 37.80 45.00 
 
 Stock 50.40 60.00 
 
 .\utoclave, same as Xo. 20528, but for 60 atmospheres pressure. 
 
 Inside Dimensions, mm 100x200 125 x 250 
 
 Capacity, liters. H 3 
 
 Duty Free 55.20 71.10 
 
 Stock 73.60 94.80 
 
 Autoclave, or Digester, for 50 atmospheres pressure, with bolted lid. This construction is recom- 
 mended for autoclaves of large capacity and for high pressure. Otherwise the construction is 
 identical with No, 20528. 
 
 Inside Dimensions, mm 200 x 250 225 x 350 
 
 Capacity, liters 7^ _13 
 
 Duty Free 135.00 168.00 ' 
 
 Duty Paid 180.00 224.00 
 
 Autoclave, same as No. 20536 but for 100 atmospheres pressure. 
 
 Inside Dimensions, mm , . 200 x 250 225 x 350 
 
 Capacity, liters 7^ 13 
 
 Duty Free 234.00 2S8.00 " 
 
 Duty Paid 312.00 384.00 
 
 Note— The above autoclaves are furnished entirely of cast iron, for operation where ammonia is freed, 
 on special order, at 5% less cost. 
 
 Autoclave, or Digester, tested to 12 atmospheres pressure, with inside dimensions of 65 mm in diameter 
 and 160 mm high. With bolted on lid, safety valve, manometer, etc,, very convenient where 
 small capacity is desired as it may be supported in an ordinary retort stand ring. This auto- 
 clave is also furnished entirely of cast iron on special order. 
 Duty Free 28.80 Stock 38.40 
 
BACTERIOLOGICAL, HISTOLOGICAL AND SEROLOGICAL APPARATUS 
 
 AMERICAN STANDARD INCUBATORS arc built under our ptu'sonal diroLaioii in the first slieet metal 
 factory in the U. S. to take up (some twenty years ago) the luanufart.iinj <,i sheet metal apparatus for bacter- 
 iological work, and they embody twenty years' experience in both t\\r [ii;iiiiii'ari.ure and selling of bacteriological 
 apparatus. The Incubators are made of heavy polished copper rn\cn'il wiili ;l water-proof, non-conducting 
 material. All are of the latest triple wall construction, which ]-)r(i\ iricw spjuT for both warm air nn<\ wnter. 
 The walls of the water jacket are (iinn.iuL'lily rrinfuivcd 1.> |.|. ■, . ,i l..il.ii - ■] i< iu 1 iml mr-./u. ,i ii,f 
 water, a defect very common in low iirinui ul^■llsjl^ Tl^ hi'i '.n-. n i i , . . ,. i n. i . -r, . . , :,-,- 
 
 tribute heat, and to evenly heat the \vatiT sjian^s mi nil m,I( - J ■■ ,1 , .,i I mi ■■jr. i ii ,- -■,''!! I uH 
 
 uniform temperature. The |in>diirN ,,f cniiiliii^tiiiii and I In.; Ih.l a:j' i-a.-.-. wu' !c, .1 ■!■ i ■ m I ■ .■ !,., 1 ,;|, .,1 1^-. 
 incubator. A glass water i^m'". -.i! -i. .■>■,„:■ vAiiv.h shuts oli" the water froni 11.. _. ii_. 1 , .msc (in- luhi is 
 broken, is provided. A mcr:ii'.i/ n,!,,. i|.|.,: m|i t\,<- air jacket connects the thenip. ■-- il 1 ■■■ '.Mtli flu' Imnier 
 and all burners furnished wim iiMi|h:ii -1-, . miiihii with this pipe by means of ihxi'.'. u,- .ilu.' hihiiiK ii>i[;ad 
 of the rubber tubing previously used, 'i'iiis is an important feature and greatly minimizf.s the danger from lire. 
 The closed in bases are of sheet-iron properly ventilated and furnished with a mica window for observing the 
 flame. All incubators are furnished with carefully prepared instructions for installing and adjustment. 
 
 Any of our American Standard Incubators, whether for gas, oil or electric heating, can be used as 
 paraffine embedding ovens at temperatures up to 70° C. In the cases of oil and elecfric heating this specifica- 
 tion should be given at the time of ordering to insure proper adjustment of regulators. 
 
 American Standard Incubalor 
 
 with 
 
 Equipment Dd, far Electric Heating 
 
 This electric heating and temperature control 
 operates equally well on direct or alternating current. 
 Electric heating units can at any time be removed 
 and incubator operated for gas heating. There are 
 no exposed terminals and apparatus operates directly 
 on the circuit. Before shipment each incubator is 
 tested to maintain a constant temperature. In order- 
 ing it is necessary to state voltage and whether for 
 direct or alternating current. 
 
 American standard Incubator 
 
 wilh 
 Eijuipment Cc, Tor Oi) Heating 
 
 This device for oi) heating incubators is entirely 
 new and is much simpler in operation and control 
 than anything heretofore offered. The regulator is 
 on the principle of the Koux metallic which directly 
 operates the damper over the lamp, permitting 
 either the escape or the utilization of the heat. 
 Under proper conditions will regulate to ^°, 
 
 EQUIPMENT Aa consists of Roux bimetallic thermo-regulator, incubator thermometer, and Koch 
 safety burner with flexible metallic tubing attached. 
 
 EQUIPMENT Cc consists of oil lamp heater, Roux bimetallic Ihermo-regulator and incubator ther- 
 mometer. 
 
 EQUIPMENT Dd consists of incubator thermometer, and electric heating units with electric thermo- 
 regulator. 
 
A R T H LI R H THOMAS COMPANY 
 
 206U4. 
 
 2060S. 
 20612. 
 
 20620. 
 20624. 
 90628. 
 
 20636. 
 20640. 
 
 20644. 
 
 206.'52. 
 20656. 
 20660. 
 
 2066S. 
 20672. 
 20676. 
 
 Incubator, American Standard, Board of Heallh Type, inside JimeiiHiuiis 25.\30xl.s inches. With 
 double doors and mounted on ba.sfc 32 inches highwitli enclosed conipartniont for burner. With- 
 out burner, thermo -regulator or thermometer 183.00 
 
 Incubator, American Standard, as above, witli Kquipment Aa for g;is healing 200.00 
 
 Ce fur oil heating! 212.00 
 
 Dd for electric heating 257.00 
 
 Incubator, American Standard, Board of Health Type, inside dimensions 18x30x14 inches. With 
 double door« and mounted on base 32 inches ingii with enclosed compartment for burner. With- 
 out burner, thermo-regulator or thermometer 157.50 
 
 Incubator, American Standard, as above, with Equipment Aa for gas heating 174,50 
 
 Cc for oil heating 185.00 
 
 " " " " " " Dd for electric heating 227.00 
 
 Inculiator, American Standard, College Type, inside dimensions 28x18x14 inches. With single door, 
 and mounted on base 27 inches high, with enclosed compartment for burner. Without burner, 
 
 thermo-regulator or thermometer 138.00 
 
 Incubator, American Standard, as above, with E(.|uipiiient Aa for gas healing 1.55.00 
 
 Cc for oil heating 165.50 
 
 Dd for electric heating 200.00 
 
 Inculiator, American Standard, College Type, inside dimensions 18x 18x 12 inches. With single door 
 ,i(id niourded nn base 31 inches high with enclosed compartment for burnei-. Without burner, 
 
 I iierruo-reguiator or thermometer 105.00 
 
 Incubator, American Standard, as above, with Equipment Aa for gas heating 122.00 
 
 " " " " " " Cc for oil heating 1.31.00 
 
 " " " " " " Dd for electric heating 163.25 
 
 Incubator, American Standard, Hospital Type, single door, on 11 inch enclosed base. In.sidc dimen- 
 sions JO \ IS X 10 inches. Without burner, thermo-regulator or thermometer 90.00 
 
 Incubator, American Standard, same as above, but with Equipment Aa 107.00 
 
 ■' " '■ " " " '■ Equipment Cc 116.00 
 
 " " Equipment Dd 148.25 
 
A R T H LJ R H T l-l T) M A S C O M R A N Y 
 
 20684. 
 20688. 
 20692. 
 
 20700. 
 20704. 
 
 20708. 
 
 20716. 
 
 20720. 
 
 Incubator, Ameritan Standard, Hospital T>'pe, in.side diuieiisious 19 x 12 x lU inches. Witlumt Imrner, 
 
 thernio-regiilator or thermomt'ter 78.00 
 
 Incubator, American Standard, same as above, iaiit with Equipment Aa 93.50 
 
 " " " " " " " " Equipment Cc . , 102.50 
 
 " " " •' " Equipment Dd 137.00 
 
 Incubator, American Standard, Hospital Type, inside dimension.^ 9i x 12 x 91 inchr-?. Without burner, 
 th(Tniri-rep;ulator or thermometer 45.00 
 
 Incubalor, American .Standard, sa.nn' as ;ibo\'i', but wilh Equipment Aa , 60.50 
 
 Equipment Cc 69.50 
 
 ■■ " Equipment Dd 100.25 
 
 Incubator, Physician's Laboratory, double wall. Inside dimensions 10x8 xS inches. Specially recom- 
 mended as a sali-sfaifoiy paralfine oven as well as for bacteriological work. Without burner, 
 
 thermn-resiulatdr ov ihriiunrnetei- 36.00 
 
 Incubator, ^-.nuL- -.'-^ jl'i vc^ Imi v, [i I, l^jiiiiMncnt Aa 51.50 
 
 Incubator, -. i ■■ ■ r ■ ■ . I i. Iil ■ ■ ■!■ ■ i. i-., inside dimensions 12 x HI x 1(1 ini'hes. Especially 
 i'ei'<i]iiir 'Mil' ■■ ■■■liii.'i ..■. |H'...i, -i' ■ I'-, dtir incubator or paraffin OA'cn is required. Without 
 
 21(724. Incubator, .s;Liiie as above, but with EqLiipnient f 
 
 43.50 
 59.00 
 
ARTHUR H. THOMAS COMPANY 
 
 HEARSON INCUBATORS. TJiese incubators consist of a \v;it.er-jackctcd chamber made of stout copper 
 surrounded by insulating material and the whole encased in wood. They are provided with an inner door of glass 
 and an outer one of panelled wood. In the two larger sizes the doors are double. The distinctive feature is the 
 temperature control by means of a metallic, hermetically sealed capsule which contains a few drops of liquid 
 having ■! l.iiill;ijj; [mint at or near the temperature which it is desired to maintain in the heating chamber. The 
 regul I iMiahed by the expansion of this capsule owing to the boiling of its contents which provides 
 
 the tr,.. . i . . . ;i,r operating the control lever. This expansion takes place only at the predetermined tem- 
 peralun , '] Ik hver will only be acted upon when the critical temperature is reached, no sensible effect being 
 produced at evtii one degree below that at which the capsule is desired to act. A sliding weight compensates for 
 slight barometric variations and, in addition, controls within certain limits the boiling point of the capsule so 
 that a range of S° C. is possible with anj' particular capsule and the total range by means of these capsules is 
 from 16° C. to 175° C. 
 
 This system of temperature control applies equally well to gas, oil or electric heating and also to the con- 
 trol of the low temperature incubator for gelatine cultures operating at 20° C. 
 
 These incubators, although comparatively new in tlie United States, have been used for a number of years 
 with'great success in leading Kuropean bacteriological laboratories, particularly those of the Pasteur Institute 
 in Paris. Instructions for operating arc furnished with each incubator, 
 
 HEARSON INCUBATORS FOR GAS HEATING. The Excel- 
 i| sior Gas Valve used in the control of incubators heated by gas and 
 
 1 W _ p operates as follows: — 
 
 \\ ^ ^ ^ ^ A is the inlet for gas; C the outlet to burner; BD a lever pivoted 
 
 ^ jflL^ m^^=^ to stan<iards at G and acted upon by the capsule, through the needle 
 
 which enters the socket below the screw P. The construction of the 
 acting portion of this valve is such that whenever the end B of the 
 lever BD presses on the disc below the end B, the main supply of 
 Af^iifli h """J- ^^ Sas is entirely cut off. At such times, however, a very small 
 
 ^IBI II '^ iiiC*^-^ quantity of gas passes from A to C, through an aperture inside 
 
 -*iSPIiJil "^3 /.^B^"^*^ the valve, the size of which aperture can be adjusted by the screw 
 
 needle S, hence the gas flame below the incubator is never extin- 
 guished. 
 
 1 III. expansirn ot the capsule owin^ to the boiling of its contents, provides the motive force for acting upon 
 thi le\ I BD 
 
'.■|iaiiye& id the aLmospln']' 
 of the normal, if observatim, 
 these variations, a sliding \>.i!_: 
 point of the capsule, and tliii ■ 
 that at which (with the wei^ln 
 
 In actual practice it is In 
 adjustment of any part, for ni' 
 air temperature in the room in 
 
 ■Hit l' 1''. on either side 
 
 To compensate for 
 
 iiin limits, the boiling 
 
 ni several degrees above 
 
 ■ can be maintained within half a degree without re- 
 nd, in spite of great changes of gas pressure, and of 
 ,rking. 
 
 .^,-^ 
 
 '=] 
 
 Hearson Incubators for i.ias Healing, with capsule adju-stcd to -iii-^ L'. unless otherwise ordered, 
 thermometer, suitable burner witli two chimncj's, 4 ft. of flexilile metallic tubing, etc. 
 
 ■■ith 
 
 las 
 
 eMi 
 
 20728. 
 20732. 
 207.36. 
 20740. 
 20744. 
 20748. 
 20752. 
 
 Incubator for Gas Heating with one shelf,. 
 
 inches 
 
 Duly free 
 -528.95 
 36.00 
 45.00 
 65.55 
 93.15 
 100.80 
 192.00 
 
 Dnlj Piid 
 $43.45 
 54.00 
 67.50 
 98.35 
 139.75 
 151.20 
 288.00 
 
 20760. 
 
 6 X 
 
 9 X 9 X 12 
 
 " " " '■ " " 12 X 12 X 14 
 
 " " " " " two shelves 15 x 15 x 18 
 
 " " ■' " " " 20 X 20 X 24 
 
 Incubator for Gas Heating, with three shelves 18 x 14 x 35 
 
 Incubator for Gas Heating with four shelves 27^ x 16 x 56 
 
 Incubator for Gas Heating, with center division of six shelves and with the gla 
 
 infour divisions to prevent loss of If.i' i\iiLii i\am- In.side Measurementa 
 
 ining cultures. Specially made t ■! ■..'■■u.vqs. 60 x 24 x 60 inches 
 
 Incubator for Gas Heating, siiccially di'.--ii;i. I ■. . L I'asteiir Institute, Paris, for the cultivation of 
 
 tuberculin. It is fitted with eight eu|/per trays with holes for the passage of air; with two 
 
 double doors on each side. ]''resli air is admitted by four tubes in the bottom and emitted 
 
 through a regulating ventilator on the top. A special " Inside MeasurcmenU Duly Free Dutr Paid 
 
 feature is the equal teinperafun: all over the interior. 31 x 27',- x 26 inches 194.25 291.38 
 
 Note— Nos. 20728,20732, 2073G and 20740 are usually in stock for immediate delivery, 
 
 HEARSON INCUBATORS FOR OIL HEATING. 
 
 The Patent Capsule control lends itself particularly' to incubators heaicd by 
 the lamp passes through a flue across the bottom of the incubatnr and I'eliiin-^ .'ma 
 parallel with the first and is then conducted to the open air by a second clniiiiii>\- ;ir: 
 the degree of heat reached in the chamber is sufficient to expand the cnji^ulf fl 
 damper from the lamp chimney and after a short period the damper will be found to hang steady in one position 
 and the temperature remain constant. These utensils may be adjusted for higher temperatures for use as par- 
 affine embedding ovens when so ordered. 
 
 iss door arranged 
 Duly Free Dufy Paid 
 
 270.00 405.00 
 
 amp. The heat from 
 J lamp by another flue 
 in illustration. When 
 ■ will rise and lift the 
 
ARTHLIR H. THOMAS COMPANY 
 
 Hearson Incubators for Oil Heating, with capsule adjustedto 37|° C, unl 
 monieter, suitable burner with two chimneys, funnel, 1 yd. of wick, etc. 
 
 Incubator for Oil Heating, ^vitll one shelf 
 
 C, unless otli 
 
 1«1V 
 
 inlpi^.l i\ith tlier- 
 
 Inside Measurer 
 
 nents 
 
 Duty Free 
 
 Duty Paid 
 
 6 X 6 X 7 i 
 
 nches 
 
 $28.95 
 
 .S43,45 
 
 9 X 9 X 12 
 
 
 3S.00 
 
 54.00 
 
 12 X 12 X 14 
 
 
 45.00 
 
 67.50 
 
 15 X 15 X 18 
 
 
 65.55 
 
 98.35 
 
 20 X 20 X 24 
 
 
 93.15 
 
 139.75 
 
 18 X 14 X 35 
 
 
 100.80 
 
 151.20 
 
 20764. 
 
 20768. 
 20772. 
 20776. 
 20780. 
 
 20784. 
 
 HEARSON ANHYDRIC INCUBATORS FOR ELECTRIC HEATING. 
 
 In these incubators the heating effect is produced by an even distribution of onu or more electric resistance 
 wires, covering every part of the apparatus otherwise occupied by the water .jacket. Suitable terminals con- 
 trolling each wire permit of the resistances being utilized in various combinations in order to provide for high 
 or low temperatures, or to enable the operator to adapt the same apparatus, within certain limits, to dif^'erent 
 voltages. 
 
 They work equally well on alternating or direct current, it simply being necessary to specify voltage. 
 
 Owing to the elimination of the water-jacket, this system of heating is not restricted to temperatures below 
 the boiling point of water, but can be aiiiiliod to drying ovens, sterilizers and other apparatus for which much 
 higher temperatures are neci'ssar^'. .\piKn .i( n- ■ mi.- 1 1 Dried on this principle heats up much more quickly 
 because there is no large volumr nf \\ nHi' i ■ ■ ' .. ■ i. ■ i 
 
 Regulation of temperaturr^ is (ITrchil I. il .^ ■ .nlc collapsion and expansion of a capsule as in all the 
 foregoing thermostatic apparatus, ;iTid (■\(iii ii.ill \ ■ n ■ui)' mean temperature is attained. 
 
 Hearson Incubators for Electric Heating, with capsule adjusted to 37|° C. unless otherwise ordered, with 
 thermometer, wall plate and plug, flexible leads, etc. These incubators operate equally well on direct or 
 alternating cuTeni but voltage must be stated in ordering. 
 
 20788. 
 20792. 
 20796. 
 20800. 
 20804. 
 20808. 
 
 Incubator for Electric Healinff, willi one shelf. 
 
 two slielves. 
 three " 
 
 Inside Measiiremenls 
 
 Duly Free 
 
 Duty Paid 
 
 6x0x7 
 
 nt-lies 
 
 $31.95 
 
 $47.95 
 
 9 X 9 X 12 
 
 
 39.60 
 
 59.40 
 
 12 X 12 X 14 
 
 " 
 
 49.50 
 
 74.25 
 
 15 X 15 X 18 
 
 " 
 
 07.511 
 
 101.25 
 
 20 X 20 X 24 
 
 
 102.45 
 
 153.70 
 
 18 X 14 X 35 
 
 
 110.85 
 
 166.30 
 
ARTHUR H. THOMAS COMPANY 
 
 INCUBATORS, FREAS" PATENT ELECTRIC. These incubators have no water or water jacket and the 
 adjustment is set at the temperature required by simply turning a milled head. 
 
 Construction — The incubators are constructed of heavy asbestos wood, with cast aluminum door and 
 door frame. This asbestos wood is absolutely fire-proof and possesses unusual insulating qual- 
 ities. This latter quality and the large thermal capacity of the body of the incubator assist the 
 maintenance of an even temperature throughout thechamber; the air space between the inner 
 and outer walls is filled with insulating material, which results in a very low heat loss, thereby 
 reducing the current consumption to a minimum. The interior is fitted with aluminum racks, 
 allowing the perforated metal shelves to be placed at any desired height. There is provided an 
 inner door of heavy glass, fitted in an aluminum frame cushioned with felt to exclude air, thus 
 permitting inspection of the chamber without opening the door and cooling the incubating 
 chamber. An opening through the top of the incubator to the chamber is provided for a ther- 
 mometer. 
 
 Regulation— The regulation device is made entirely of metal, substantially built, so that it is practi- 
 cally impossible for it to get out of order. Its action depends upon the expansion of a metal 
 tube running through the chamber from top to bottom, operating a lever which "makes" and 
 "breaks" a contact, with proper means to prevent arcing. The lever is extended to serve as an 
 indicator, operating up and down the graduated temperature scale on the outside of the incu- 
 bator. The indicator is moved to the temperature desired by turning the milled-head screw 
 at the bottom of the scale. The regulation is sharp and accurate to a fraction of a degree and 
 remains so indefinitely. 
 
 Temperature Range — The temperature range of the incubator is from a degree or so above the sur- 
 rounding air temperature to 60° C. ; the regulating device operates just as satisfactorily at lower 
 .IS at higher temperatures. 
 
 Heating Element — The heating element consists of a wire wound resistance plate situated at the bot- 
 tom of the incubator. While there may be no need to remove it, it can be very easily taken out 
 if desired. The plate is wound for 75 watts,, about 50 watts being required to maintain a tem- 
 perature of 37^". 
 20812. Incubators, Freas' Electric Ko. 20 22 24 26 28 32 36 40 
 
 Inside dimensions, inches 7 ^7x10 7z7xl0 12xl2xl2 12x12^12 16x14x16 ISx 16x20 2fi xl4x22 32x18x24 
 
 Each 52.50 57.50 80.00 87.50 140.00 190.00 225.00 270.00 
 
 Note— Nos. 22, 26, 28, 32, 36 and 40 are provided with switches, one for the current and the other for 
 the electric lamp illuminating the chamber. Nop. 28, 32. 36 and 40 are furnished on high bases, 
 as shown in illustration. Nos. 36 and 40 can be furnished with compartments for students' use. 
 Prices on application. 
 
ARTHUR H THOMAS COMPANY 
 
 e Control, showing Control Capsule, 
 
 Snitch and Bloi. 
 
 Directions for Constructing an Incubating Room and for Installing Electric Temperature Control. 
 
 The room should be constructed of brickwork 9 inches thick and perfectly square inside, 6x6 ft. and about 
 7 ft. high. There should not be any windows, but two doors, the outer door being; closed before opening the 
 inner door of the chamber. These doors should be made of white pine 2 inches thick and the walls glazed or 
 covered with parian cement and the floor and ceiling insulated with slag wool. A 9-inch ventilator should be 
 fixed near the ceiling and nine 1-inch holes in the bottom of each door. 
 
 Attach the Automatic Switch and blow out oi marble base outside the room to be heated, in a convenient 
 position and bring the main supply to this switch and connect at the back of switch base. Place the four Ra- 
 diators in the incubating room, one on each side between the first two shelves {not on the floor) and carry 
 wires from the Automatic Switch to each Radiator in parallel and connect to the terminals indicated. Place 
 the Capsule Switch with lamp about the height of the third shelf (not against the wall) and carry wires from 
 this to the Automatic Blow-out Switch and connect to terminals indicated. 
 
 The installation is then complete and the current may be turned on. The Radiators will heat up and con- 
 tinue to do so until the Capsule expands and interrupts the current, when the magnetic coils will drop the arma- 
 ture and the current will cease to flow to the Radiators whirii will cool down until the Capsule again collapses 
 when the current will be again switched on. This will rontinuc nutoinaiicalh-. 
 
 To increase the temperature screw down the inilli'd |jc;iil si'i'i'w on I ':\\i^i 
 to decrease the temperature reverse the process. Si'r tiuit the farbons i>n 
 other perfectly, otherwise a spark of eruption will occur and cause rapid detei 
 ing except at the moment of breaking contact. 
 20816. Incubating Room Temperature Control for Electric Heating, Hearson, as above described. When 
 the capsule is collapsed the lever arm is kept in position by the solenoid, and the current is free 
 to pass to the heaters. Upon the expansion of the capsule contact is broken, the solenoid 
 ceases to act, the lever arm drops suddenly and the current to the radiators is checked and 
 by means of the electric blow-out, the sparking is reduced to a minimum. The current remains 
 cut oif until the temperature of the room is so reduced as to allow the capsule to contract and 
 contact again be made. The outfit consists of capsule switch, four radiators and blow-out 
 panel switch and is based on keeping a room (3 x 6 x 7 ft. at a constant temperature. Larger 
 rooms must he supplied with additional r;idi;itor>j. Price of outfit for either direct or alter- 
 nating current. 
 Duty Free 94. .".0 Dut> Paid ..141.75 
 
 ' Switch a turn or two at a time; 
 iir Automatic Switch touch each 
 ration. There must be no spark- 
 
COMPANY 
 
 2(IS2(I [iKiibitiiitt Room Itmptrature < ontrol tor (as Heating W itli i wt-ll 
 
 iijsiil itMl 1 mm 1 unitunn li ri]]iM itiui ■ ni Im hi iirit liii. <J within 
 
 ^^ IU|-^ _ ^M^\, il,( ;, , ul ll,( ,. ^ ,lv. u mil, lor ,nd , .ml ,\>U ^.i. -- ■ 
 
 '^^■"^ I J parts of the tui'td hii tht piLi p > < nl i iti|i< i il iii< < |ii Hi/ ilnm ind 
 
 t\Old'inte of snit II trorn i ljr pi in l 1 mi ii li n i ml f, isp-- nf 
 fi rmcntation < tt 
 \fnipnt i)ositii)ii uauilK m ii tin dnui I in- i-^ \< i t, is \ lU f 
 
 «iiii ( ip 1,1' miK n >0 
 
 
 Incubator, Hearson New Compartment. For eilln 
 
 compartments ot copper, water-jackett'd andinsalitid i i< 
 inches. Temperature may be adjusted from 2'?-i2" C _ H 
 determined range. Each compartment is fitted with \ I [i , i 
 cally controls the entry of warm water from the hf itni^ 
 surrounding each compartment or to the'naste \ dit^ticn 
 
 mis ( iiii-iistnit, iif nine 
 ' miipii tinpnt bein,f 7 \ S x 6 
 < +11 47" (_ or in\ other pre- 
 I nil! ml (.apsule which automati- 
 iil- iithtr into thf water jacket 
 m tempeiatuie ot less than a 
 
 degree in the compartment suffices to change the flow of v, am w itei \ contiol Lipsule is con- 
 nected with the heating tank also so that the supph of w iim n iter is < on tanth under < ontrol. 
 All the compartments may be operated indi jiend nitU <.l imi tnotlH i 
 Duty Free $345.15 _ J Duh Piid '^517.75 
 
 20S28. [Incubator. Embr.vological, Hearson 
 Electric, operating on the same 
 priiicipl<' ay the Hearson bac- 
 teriological incubators previ- 
 ously described, capacity 50 
 eggs. This is a very much 
 more convenient apparatus 
 than the usual chicken incuba- 
 tor used for embryological pur- 
 poses. Voltage must be spefi- 
 tied in ordering. 
 Duty Free. , " 37.80 
 
 Dulv Paid 5(i.70 
 
Incubator, (.'ompartmcnt form, for difi'(;reiit temperatures in fbr ^ m U'i compartments between 24° 
 :iiiil 60° C. Earh eomiiartiueiit is 30x20x25 cm. With both M,lass and metal doors. With 
 irner, thernio-regulator, etc., but without thermometer. Witli ten compartments as shown 
 
 in illustration. 
 
 Duty Free 396.00 
 
 Incubator, Compartment form, same as above but for 
 with ice box and ice water cooling arrangement. 
 Duty Free 495.00 
 
 Duty Paid 480.00 
 
 leinperatures, i. e., between and 22° C. 
 
 Duty Paid 600.00 
 
 Incubator, Hearson, Parasite, as 
 
 suggested by Dr. Boycott 
 of Guy's Hospital, London, 
 AVith adjustable ventilator. 
 The air is heated by passing 
 through tubes in the warm 
 water in the tank after which 
 it passes over a water tube 
 in order to take up sufficient 
 moisture. With fitted ther- 
 mometer and hygrometer to 
 show moisture percentage in 
 the interior of the incubating 
 chamber. Size inside, 20 x 
 20 X 14 inches. Similar in 
 construction and operation 
 to the Hearson gas incuba- 
 tors. 
 
 Duty Free 101.25 
 
 Duty Paid 152.00 
 
 ^m-v 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 20848 So 
 
 LOW TEMPERATURE INCUBATOR, HE4RSON MODH < j r I flow of water 
 
 Most of the low temperature incubttoi^ < \n only be ^r I \ I g 1 nal a r s 10° 
 
 below the temperature required in the incubating chamber, and the expedient sometimes resorted to of running 
 cold water through them to keep the temperature down can, in summer time, be adopted with advantage, but 
 the results are not altogether satisfactory, cultures being frequently spoiled by an unexpectedly warm day or 
 night. 
 
 In summer, therefore, or in hot climates, cultivation of gelatine can only be considered safe in an incubator 
 using ice, and the special feature of this incubator is that it will automatically remain constant at 20° Cent., or 
 any other predetermined temperature, using only the theoretical amount of ice requisite to obtain this result, 
 even though the external air may be 30 or 40 degrees above the temperature desired in the interior. 
 
 With capsule adjusted to 10° C. unless otherwise ordered, with thermometer, ice funnel, gas fittings and 
 4 ft. of flexible metallic tubing (or, if for oil lamp, 2 chimneys and 1 yd. wick) and packing. With suitable 
 burner for either oil or gas heating. Please specify when ordering. 
 
 Inside Measurements Diilf Free Duty Paid 
 
 20844. Low Temperature Incubator Model C 9x 9x12 inches S65.25 197.90 
 
 20848. " " " " " 12 X 12 X 14 " 93.15 139.75 
 
 20852. " " " " " 15 X 15 X 18 " 117.30 175.95 
 
 20856. " " " " " 20 X 20 X 24 " 165.60 248.40 
 
 NOTE.^Thia Low Temperature Incubator is one of the most aatiBfactory bacteriological iitenaila we have ever .sold and it has been supplied 
 by U3 to leading Universities, City and State Boards of Health and U. S. Government laboratories. All of these users are unanimous 
 in reporting satisfactory 3er\-ice. 
 
 LOW TEMPERATURE ELECTRIC INCUBATOR, HEARSON MODEL G. for ice and electricity, working 
 independently of any constant water supply as required in model C. This apparatus is identical with Model 
 C except that an electric heater is provided which automatically operates when the room temperature is lower 
 than the temperature required in the chamber and an electric motor which automaticaily circulates the water 
 from melting ice to the water jacket when the temperature of the room is higher than the temperature re- 
 quired in the chamber. No connection with a water supply is required and the apparatus may be set to operate 
 at any temperature from 10° to 37° C. and can be operated in any climate and in any place where water and 
 electricity are available. Control is by the Hearson capsule and full operating directions are supplied with 
 each utensil. Voltage must be specified in ordering. 
 
 Inside Measurements Duty Free Duly Paid 
 
 20860. Low Temperature Electric Incubator Model G 9 x 9 x 12 inches 94.50 141.75 
 
 20864. " " " " " " 12x 12x 14 " 119.25 178.85 
 
 20868. " " " " " " 15 X 15 X 18 " 159.00 238.50 
 
 20872. " " " " " " 20 X 20 X 24 " 210.00 315.00 
 
ARTHUR H. TH 
 
 2087 (>. Incubator, Low Ttmperiiture, 
 Giddings. The incubator proper 
 is regular water-jacketed type with 
 outer air space and covered with 
 a heat insulating material. Be- 
 neath the incubator is an ice chest 
 fitted with coils of pipe, which are 
 connected to the water jacket of 
 the incubator so that the water 
 may circulate freely. In the pipe 
 line is a pump operated by an elec- 
 tric motor. This motor is con- 
 trolled by a thermostatic bar which 
 makes and breaks the circuit 
 through a solenoid switch, ener- 
 gized by the line, thus rendering 
 the operator independent of the 
 troublesome dry battery. 
 
 The regulation is effected as 
 easily as with the ordinary electric 
 incubator, the temperature for 
 which the thermostat is adjusted 
 remaining constant within ^°. All 
 parts are readily accessible, and 
 the construction is very simple. 
 To put the equipment into oper- 
 ation it is only necessary to con- 
 nect the feed wires and turn on the 
 current. 
 
 The cooling arrangement per- 
 mits practically any desired tem- 
 perature below that of the room to 
 be maintained. If a temperature 
 below the freezing point is rei^uired, 
 cracked ice and sodium thiosul- 
 phate (hypo) are placed in the ice- 
 chest, while from 4 to 12 liters of 
 water are drawn off and replaced 
 by a solution consisting of 50% of 
 glycerine and 50% of alcohol (95%) . 
 
 Please specify voltage and cur- 
 rent in ordering. If for alternat- 
 ing current also state number of 
 cycles. See Phytopntht logy, Viil. II, 
 p. 106, 191S. 
 
 Size, cm. ,45X75X^55 70X45X35_48X45X35 
 
 Each 290.00 270.00 235.00 
 
 Size, cm, .48X45X24 48X30X24 24X30x24 
 Each TlO~00 190.00 170.00" 
 
 20880. Coagulator for Blood 
 Serum (Inspissatorj, Hearson An- 
 hydric Electric, operating ex;utl\ 
 the same as Hearson Incubators. 
 For 40 tubes. Voltage and tem- 
 perature must be given when 
 ordering. Complete with ther- 
 mometer. lnsi<li> HiriiPiisioiiw 2j; 
 inches long, Id:,' imlirs w'ldr \>\ '■', 
 inches dec|i, huliLs fniif rr:iys I'lirli 
 containing 10 lull's. 
 
 Duty Free 39.011 
 
 Duty Paid ->S.?>(t 
 
ARTHUR H, THOMAS COMPANY 
 
 Hearson Cellular Incubator for Students' Use. This Incubator is heated by gas or electricity aod the 
 fittings for regulating the temperature are the same as in those previously described. Prices given below are 
 for gas heating. Electric heating adds S21.00 duty free and S31 50 duty paid to the list prices printed below. 
 
 This utensil is designed for use in educational laboratories where it is desirable to provide each student 
 with a separate incubating chamber or drawer which may be removed from the apparatus without affecting the 
 temperature of the remaining drawers. The inside of the utensil is strongly made of heavy copper, firmly stayed 
 at frequent intervals. Each drawer of the size 13| x 8^ x 4f inches will accommodate about 60 culture tubes. 
 
 Seven fiat copper tubes, extending the whole length of the drawers, form the side.^ and divide the appa- 
 ratus into six vertical compartments; these are again sub-divided by eighteen terne-iron shelves, into four 
 divisions horizontally, thus forming twenty-four pigeon holes water-jacketed in every case on two sides. 
 
 All the vertical tubes are joined to horizontal tanks at the top and bottom, so that the water is free to 
 move up or down any of the tubes, or even up and down different parts of the same tube, thus equalising the 
 temperature in all directions. 
 
 The drawers are made of terne-iron, which is not liable to rust, and each drawer has a thick varnished 
 wood front, bearing a number which serves to show the order in which they should be replaced and enables 
 the student to easily recognize the compartment allotted to him. The removal of one or more drawers does 
 not appreciably affect the temperature of those which remain, and when the outer doors have been closed for 
 a short time the temperature i.s practically the same in all parts. 
 
 Duly Frcp Duty Paid 
 
 20884. Cellular Incubator, for Gas, with 24 drawers, each 13f x 8i x 4^ inches $172.50 $258.75 
 
 20888. " " " " "12 " " 9 X 4| X 14 " 136.50 204.75 
 
 20892. " " " " "12 " " 9 X 9M 14 " 183.00 274.50 
 
ARTHUR H. THOMAS COMPANY 
 
 20896. Coagulator for Blood Serum ( Inspissator) , Hearson, with Patent capsule temperature control, for 
 gas heating. The utensil is strongly made of copper, with trays holding serum tube;? at a proper 
 anglo 
 
 In h.> 111. ^11 -to 
 
 Diitv Frte 39.00 ,>2..50 
 
 rnjl\ I' ml oH-iU 78.75 
 
 Coagulator for Blood Serum (Inspissator). The two front Ic^s are slotted so that the oven may be 
 tiltcfi for securing necessary slants to the test tubes. Of same construction as .American Stand- 
 ard Incubators. Without thermometer, burner or thermo-regulator. 
 
 Inside dimensions, inches 12 x 10 x 2^ 16 x 14 x 2| 
 
 Each 21 .00 27.00 
 
 Water Bath for Vaccine Cultures, Hearson, of heavy copper, with burner and Hearson Capsule 
 for control, with removable rack for 48 test tubes. 
 Duty Free 26.25 Duty Paid 39.50 
 
ARTHL'R H THOMAS COMPANY 
 
 MMyjk, 
 
 Water Bath and Incubator, Hearson, for Wasserman Test This uiiparatiis consists of a strong cop- 
 per vessel, nickel-plated, on a stand. The incubator is a double sided reservoir and iajpro- 
 vided with a glass front and back. It is intended to be used on a bench facing the light. On 
 the side of the apparatus a small tank is fixed, to which Hearson's control capsule is attached. 
 This is regulated for 56 to 60° C. for the sterilization of liquids, and is provided with two per- 
 forated plates, one to take ordinary test tubes and other for small tubes. It is also provided 
 with a hinged cover held in place by a spring which is laid over the wadded stoppings of the 
 reagent tubes in order that they may remain in the water. The incubator itself is fitted 
 with Hearson's control capsule and is regulated for 38° C. Thermometers are provided for 
 two compartments, also two racks. The whole forms a very useful and complete set for the 
 studv of the Wasserman process. 
 Duty Free 55.00 Duty Paid 80.00 
 
 Water Bath, Hearson, for Wasserman Reactions, etc., with Hearson Patent Capsule control and remov- 
 able test tube racks and covers for same while in the bath. Each tray holds 36 tubes. 
 
 Xumber of trays 2 4 6 
 
 Duty Free " 37.80 60.00 75.60 
 
 Duty Paid 56.70 90.00 113.40 
 
ARTHUR H. THOMAS COMPANY 
 
 H^i^'^^s*^^^^^:^ 
 
 -_j„uUliJ*»' 
 
 Water Bath, for Wasserman and otlier Serological Reactions. Liermann-Meier: with three metal test 
 tube racks containing 72 tubes. The front wall of the bath is of glass and the back is finished 
 in white to enable accurate observations of reactions without removing the trays. With two 
 burners, thcrmo-regulator, and thermometer as shown in cut but without test tubes. 
 I'i'l' Free 33.10 Duty Paid 40.05 
 
 Incubator, Opsonic, with 20 tubulations for pipettes, each with serial number. Of heavy, polished cop- 
 per on sheet iron base 8 inches high; with tubulations for thermometer, gas regulator and filler, 
 and a cup 1 x 3; inches for holding instruments. .Size 14 x 8 x 4 inches 17.25 
 
 Incubator, Opsonic, same as above, but including 6 tubes, J inch diameter, in the top to hold test 
 'ibcs ■; 21,00 
 
 Sterilizer, Ins/rument, convenient in the pathological and bacteriological laboratory for the steriliza- 
 tion of syringes, instruments for animal operations, etc. The tray carrying the syringes or instru- 
 ments IS lifted clear of the water when the lid is raised and supported in this position. Of copper 
 nickel plated, 10 x 5 X 3 inches 15 00 
 
 Sterilizer, Instrument for purposes similar to above but for electric heating. With automatic cut-out 
 winch cuts nfl (he current if sterilizer is allowed to run dry. Complete with 5 ft. of cord, con- 
 nector and l:uii|, socket plug. Apparatus is of copper, nickel plated. Dimensions 10x4^x2 
 
 inches 
 
 With three lie 
 
 18.00 
 
A R THUR H, THOMAS COMPANY 
 
 BENKET B. T'' « ^^rT-L&N 
 GOSHEL, .. D;.UV-.3SITY 
 
 No ' ')3(> 
 
 Autoclave or vertical Hteam Pressure Sterilizer, American Standard, (^f hetivy polished coppur Ua 
 lined. Lids of heavy cast brass, nickel plated and fitted with steam-tight, ground in bevel 
 joint, obviating entirely the use of washers. This apparatus is the most widely used autoclave 
 in bacteriological work and has been supplied by us to many leading laboratories for over four- 
 teen years, with unfailing satisfaction. Each apparatus is tested and guaranteed to stand a 
 pressure of 35 lbs. to the square inch, and is provided with proper gauge and thermometer, 
 reading both in temperature degrees and pounds pressure, also safety valve. With six screw 
 clamps on lid. Prices on gas and oil heated apparatus include suitable burners. Prices on 
 electric heating include cord and plug and electric heater. Inside dimensions 1 1 inches diameter 
 by 24 inches deep. with gas healirK Wi.h oil healing Wilherertrieh^tina 
 
 Method of heating eg uipmem equipment equipment 
 
 Each 60.00 64765 " iOIKOO 
 
 Autoclave, same as No. 20936, but with liiiigL'd lid 
 
 Method of heating, . ... . . 
 
 Each 
 
 Autoclave, same as No. 20936, but with ten screw 
 
 diameter by 26 inches deep. „i,j, ^^^ hea.in« with oil hea.ing with electric heating 
 
 Method of heating equipment equipment equipment 
 
 Each, 
 
 65.00 
 
 f clamps on hinged li 
 
 With gas heatir 
 equipment 
 
 70.65 
 
 Inside <li 
 
 105.00 
 XTLsioTis 14 inches 
 
 20952. 
 20956. 
 
 97.00 130.00 
 
 Autoclave, or Vertical Steam Pressure Sterilizer, German type with instantaneous clamping device 
 for lid, manometer, safety valve, drain cock, etc.; and burner permanently fixed in jacket of 
 apparatus. Boiler is of heavy, seamless hammered copper, heavily tinned on the inside, enclosed 
 in enamelled iron outer ventilating jacket. Lid is of brass and all trimmings are heavily nickel 
 plated. With tripod inside for supporting baskets, etc. Adjusted for a working pressure of 
 15 lbs., equal to a temperature of 121° C. Inside dimensions 200 x 400 mm. 
 
 Duty Free 63.00 Stock 84.00 
 
 Autoclave, as above, with petroleum burner, for use where gas is not available. 
 
 Duty Free 66.30 Stock 88.80 
 
 Wire Basket, nickel plated, for above, with hinged lid, 200 mm diameter by 200 mm high, i. e., 
 
 two baskets exactly fill autoclave. Very convenient for test tubes. 
 
 Duty Free 5.05 Stock 6.75 
 
ARTHUR 
 
 THOMAS COMP ANY 
 
 20960, Autoclave or Steam Pressure Sterilizer, Horizontal Form. No mechanical fastening whatever is used 
 to secure the door and no packing or gasket is used to make the joint steam-tight. The steam 
 pressure from within seals the door absolutely. The apparatus is made of heavy, polished 
 copper with a double wall or jacket. Can be used for steam, gas or petroleum heating, but will 
 be supplied for use with gas unless otherwise specified. Because of the double jacket the cotton 
 plugs in the culture tubes are absolutely dry when the door is opened. When this sterilizer 
 is supplied for direct steam connection the generator shown in illustration is not required, for 
 which we make an allowance of from $10.00 to $17.00 depending upon the size nf the sterilizer. 
 
 Inside dimensions, inches 16 x 12 20 x 16 24 x "20 2S x 22 28 x 25 
 
 Each 130.00 150.00 175.00 250.00 333700 
 
 20964. Autoclave or Steam Pressure Sterilizer, Horizontal Form, double cylinder type with steam space entirely 
 surrounding except at the door of entrance. A particular feature of this sterilizer is the fact that 
 the contents of the inner chamber become perfectly dry within one minute after the steam is 
 withdrawn, Ebonized or enameled bronze door and frame with copper end, seamless drawn 
 brass or copper shell (tinned internally) forming walls of sterilizing chamber, jacket and all 
 fittings highly polished and nickel plated, mounted on white enameled tubular steel stand. 
 Heating can be done by steam, gas or petroleum as ordered but will be supplied for gas heating 
 unless otherwise specified. 
 
 Inside dimensions, inches. . 9^x_ 19 12 x^O 14_x 22 16 x 24 20 x 28 24 x 32 
 
 Each 175.00 225700 ^300.00 350.00 450.00~ ~650760~ ~ 
 
 Note. When arranged for steam or gas heating, we recommend the use of the special auto-control 
 valve, so designed that when the desired pressure is reached the supply is cut down just enough 
 to maintain such i^rps.siire. This adds $10-00 to the cost of each of the above sizes. 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 2098^ No. 20980 
 
 Hot Air sterilizer, with Regenerative Heating System, so-ciilicd ' ' Laiitenschliiger' ' form. Of best Russia 
 iron, covered with asbestos on the outside. Witlj three walls, providing two air spaces. When 
 heated by gas, a row of small Bunsen burners placed around the outside of the base creates a 
 circulating hot air current which passes through the oven as indicated by the arrows in the illus- 
 tration. When heated by petroleum blast burner, or by electric units placed in the base, the 
 circulation occurs in the same way. The electric heating device provides one heat and includes 
 cost of relay and regulator. A temperature of 360° F. (182° C.) may be had with the electric heater 
 in 20 minutes. The gas heated sterilizer may be used for either gasoline gas or natural gas by the 
 use of adjustable burners in place of the regular. These are furnished upon order at a slight 
 extra charge. Inside dimensions 12 x 18 x 9 inches. On low base, with thermometer, range 
 
 200° C. iStyle Wllh gas heating With nil healing With electric heating 
 
 equipment equipment equipment 
 
 Each 47J5 " " 59.00 100.25 
 
 Hot Air Sterilizer, game as above, but with inside dimotisions 18x2-1x14 inches on low base, with 
 
 thermometer Style with gaa heating Wilh oil healing With electric heating 
 
 equipment equipment equipment 
 
 Each 65.00 ^77775 130^5 
 
 Hot Air Sterilizer, same as above, but with inside dimensions 24x30x18 inches on low base, with 
 
 thermometer Style with gas healing With oil heating With electric heating 
 
 equipment equipment equipment 
 
 Each 110.00 12877.5 ~ 173^75 ~~~^ 
 
 Hot Air Sterilizer, same as above, but on high base, with thermometer. Inside dimensions 30 x 30 x 20 
 
 inches Style with gag heating With oil heating Wilh electric heating 
 
 equipment equipment equipment 
 
 Each 166725 " 196.25 ^63775 
 
 Hot Air Sterilizer, double wall, asbestos covered, with built-in burners, for gas heating only, with ther- 
 mometer. 
 
 Inside dimenaions, inches 12 x 24 x 12 19 x 12 x 9 § 18 x 24 x 14 
 
 Each 38.75 3T25 ' 46725 
 
2098s, Hot Air Sterilizer, double wall, of sheet iron, with enclosed base, asbestos mat thermometer and burner. 
 With two shelves. Inside dimensions 10 x 12x10 inches 19.75 
 
 20992, Hot Air Sterilizer, same as No. 20988, but with one shelf and inside dimensions 9x9x6 inches. 13.10 
 
 20996. " " " of sheet iron, double wall. Wall form, with fork to hold burner. Including ther- 
 mometer and burner. Inside dimensions 11x9x9 inches 15.75 
 
 21000. Sterilizer, Freas Patent Electric. The general construction, regulating and heating of the Freas' Elec- 
 tric Dry Sterilizer is identical with that of the Freas' Electric Incubator, the only difference 
 between them being that the Sterilizer is graduated for temperatures up to 175° C. and accord- 
 ingly provided with heating plate wound for 600 watts. The Sterilizer is not provided with inside 
 glass door, while the insulation space between the walls is greater than with the Incubator, on 
 account of the higher temperatures maintained. 
 
 Inside dimensions, in 7x 7x 10 !2x I'ix 12 14 x 17 x 18 
 
 Each 50.00" ~ 72.00 165.00 
 
 Note— Size 14 x 17 x IS inches is mounted on Jieavy iron base wilh legs, total height about ,5 ft. 
 
 21004. Sterilizer. Hot Air, Hearson, 
 Electric, adjustable for 
 temperatures from 150" 
 to 175° C. The opera- 
 tion is similar to that of 
 the Hearson Electric In- 
 cubators e.vcept that the 
 heating unit is provided 
 for higher temperatures 
 and a better insulation 
 is built in. 
 
 Inside dimensions, 
 
 inches Duty Free Dutj Paid 
 
 12 X 9 X 9 45.00 67.50 
 
 15 X 12 X 12 51.75 77.65 
 
 18 X 15 X 15 70.50 105.75 
 
 22 X 15 X 15 94.50 141.75 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 210(18 
 
 Arnold Steam Sterilizer, Boston Board of Health Form, 
 
 stiiiid or burner. 
 
 Insifle dimensions, inches 
 
 Each 
 
 Uf till lined cupper throughout. Without 
 13| X S X 8 
 
 16x 12x 12 
 40.00 
 
 35.00 
 Arnold Steam Sterilizer, same as above but with rectangular .sheet iron stand, 6 inches high, and Fletcher 
 
 ladial bun 
 
 Inside dimensions, inches,. 
 
 Each 
 
 _16_^12j^12_ 
 44.00 
 
 13| x8xS 
 39.00 
 
 Hearson Automatic Electric Steam Sterilizer. This Sterilizer is operated upon any ordinary lamp 
 socket (voltage must be specified in ordering) and, in addition, connection established with a 
 constant water supply with overflow to sink. The apparatus operates absolutely automatically 
 from the moment the switch is turned on. When the water boils the current is automatically 
 reduced and no more current is consumed than is required to keep the chamber full of steam. 
 Where a constant water supply with sink for disposal of waste is not available, one pint of 
 
 water will operate the sterilizer for twenty -four 
 hours without attention. Flasks of media may be 
 placed on the bottom of the sterilizer without danger 
 of cracking and the filtration of agar effected with- 
 out special precautions. The outfit is extremely 
 economical in current consumption, gives oft no 
 fumes of any kind and allows no .steam to escape. 
 
 Height, inches , . . , 10 22 
 
 Diameter, inches 8 12^ 
 
 Duty Free 63.00 ~ 84 00 
 
 Duty Paid 94 50 12B 00 
 
 21020. Arnold Steam Sterilizer, Cylindrical Form. Automatically 
 maintains a constant temperature of 100° C without 
 attention. Of tin, with copper bottom. 
 
 Inside dimensions, inches 7j x 85 IO5 x 91 
 
 Each 3.50 ~ 4.50 
 
 Inside dimensions, inches llj x IO5 12^ x IH 
 
 Each ~5^00 "5.50 
 
 21024. Arnold Steam Sterilizer, same as above but of copper 
 throughout. 
 
 Inside dimensions, inches 7i_x 85 lOJ x 9| 
 
 Each. 9.25 ~ ~ ~I3.75 
 
 Inside dimensions, inches llj x IO2 12^ x llJ 
 
 Each 15^00 17.00~' 
 
A R T H LI R H . THOMAS COMPANY 
 
 Paraffine Embedding Oven, liouhle wall, of heavy sheet copper, on wrought iron stand, with extra sheet 
 iron bottom to prevent burning out. With perforated shelf, but without burner, thermometer 
 or thermo-regulator. 
 Inside dimensions, inches 3g- x 5| 7| x 7^ 9i x 9| 
 
 Each 8^ " 
 
 Paraffine Embedding Oven, sarue as above but with enclosed sheet 
 drafts. 
 
 Inside dimenMoni in h -. j^ \ d. 
 
 Each ... 9 00 
 
 Extra for Copper Rings t . tit im si7(. ot \os 210JS i >l(l{'(K 
 t % t I I ith 
 
 10.00 14.00 
 
 base to protect burner from 
 
 11 00 
 
 • tl it Mnie may be used is 
 I iO 
 
 15 00 
 
 No 21U4H 
 
 Paraffine Compartment Embedding Oven, Liliie, of polished (.oppei with double wills, of same general 
 i-Miistruftion as American Standard Incubators. Drawers 10x4x3^ inches with sides and back 
 of perforated zinc. On sheet iron base 10^ inches high. Gas heating equipment includes 
 metallic connecting tube, Greenman burner, Greenman thermo-regulator and thermometer 
 Oil heating equipment includes oil lamp, regulating device and thermometer. Electric heat 
 includes three heat disc for temperatures up to 60" C with relay and regulator. 
 Q. I Wilhout Willi KttH healing With oil hpatinu 
 
 riiyie equipment cciuipment equipmenl 
 
 Each 72.00 91.25 110.25 
 
 Paraffine Embedding Oven, same as No. 21040 but with l(j drawers. 
 
 y, , Without With gas healing Wilh oil heating 
 
 'J'.' '" equipmeni equipment equipmeni 
 
 Each 102.00 121.25 "138.25 
 
 Paraffine rompartment Oven, Liliie, Improved Model, similar in construction and equipment to No. 21040 
 With S drawers .'iml 'J n-eppf :ich>s wif.h .srr.-w tops and stopcocks to enable the contents to be run 
 into mmilds as icquirrd. W ith 12 |»-rfnr:itod trays for drying and fixing purposes. On base 15 
 inches hieh. ,,,.,. , „,. , 
 
 a. , ^ Wilhoul Wilh Ba« healing With oil healing With eleetric healine 
 
 '="'-''*' equlpmeni cquipmenl equipment equipment 
 
 Each 165.00 194.25 207.85 " 240.85 
 
 illi eleclric healii 
 ec|uipment 
 
 13.5.85 
 With eleclric heaU] 
 16878" 
 
ARTHUR H THOMAS COMPANY 
 
 No. 2IUbU 
 
 Paraffine Embedding O^ens Hearbon f r ji & 1 eifing. These utensils are identical with the Hearson 
 bactpi lOf, il lncubj,tors for }, is he iting li&ted on p. 24, excepting that the capsule is adjusted 
 for operation at temperatures between 45° and 60° C. instead of 37^ to 40° as regularly sup- 
 plied with the Incubators. These capsules can be used interrhangeably with those supplied 
 with the Incubators. Complete with burner and thermometer. 
 
 Inside measurements, inches ti x 6 x 7 9 x 9 x 12 12 x 12 x 14 15 x Ij x 18 20 x 20 x 24 
 
 Duty Free 28.95 36.00 45~06 65.50 9.3.15 ^ 
 
 Duty Paid 43.45 54.00 67.50 98.35 140.00 
 
 Paraffine Embedding Ovens, Hearson, Anhydric Electric. Adjusted for temjicraturos from 4.)" to 60° C. 
 Works equally well on direi't or alternating; current but voltage must he stated in ordering. 
 Identical in appearance and operation with Hearson Klecfrii' Incubators. 
 
 Size, inches 10 x 7 x 6 12x9x9 
 
 Duly Free 37.80 45.00 
 
 Duty Paid 5SJ.70 67.50 
 
 Paraffine Embedding Bath, Coplin. The bath is supplied with foui imlcpMiWriit cups of 3inch diame- 
 ter and one ht.rge central reservoir 7 inches in diameter, the l:iUcr cimnected with stopcock in 
 front to draw off melted paraffine. Three spaces are sup- 
 plied in front for heating material in glass vessels such as 
 tall form fStender dishes. On iron base 17 inches high, with 
 cylindrical shield for the gas flame. Without burner, ther- 
 mometer or thermo-regulator. 
 Outside dimensions, inches 12 x 13 x 23 24 x 12 x 23 
 
 Each. . 
 
 33.00 
 
 48.00 
 
 Vacuum Embedding Apparatus, Hearson, consisting of a water 
 bath with a heavy copper paraffine bath, 7 x 4^ inches, with 
 thick plate glass lid made air-tight by means of a rubber 
 ring. The apparatus mav be used as an ordinary embed- 
 ding bath, i.e., without exhaustion, or the paraffine bath 
 proper may be exhausted by a few strokes of the air pump. 
 The removal of all volatile reagents in which tissues have 
 been soaked preparatory to embedding, is very much 
 hastened by the use of tliis method. The control of the 
 water bath is by Hearson's cansule. For gas heating. 
 Price includes buiner, flexible tubing and thermometer. 
 
 Duty Free 23.25 
 
 Duty Paid 31.50 
 
2106'^. Vacuum Embedding Apparatus, Hearson, Electric, rectunguhir 
 foini, with two copper pans Oj inches in diameter. Com- 
 plete with thermometer, flexible cord and wall plug. 
 Duty Free 40.50 Duty Paid 60.75 
 
 21072. Dehjdrator, Hearson, for Continuous Drying of Tissues in 
 Alcohol. This dehydrator consists of a water bath, boiler, 
 condenser and receiver. The boiler containing the spirit fo be distilled is heated by means of a 
 fias flame through the intermediary of the water bath, the water bath being constantly replen- 
 ished with the hot water which comes from the condenser. A is the water bath supplied by the 
 pipe F through the intermediary of a small reservoir B, the surplus water from which runs to 
 waste at the pipe F. O is the supply for cold water for condensing the vapor of the spirit as fast 
 as it is formed. E is a glass tube to enable the spirit to be seen as it leaves the condenser. C is 
 the receiver which must always be full of spirit up to the overflow. The spirit, overflowing from 
 the receiver, runs into the boiler through the pipe T. The action of the dehydrator is such that 
 the container is always full of absolute, or nearly absolute, alcohol. Tissues placed in C are 
 rapidly deprived of their moisture and the water thus abstracted is left behind in the boiler and 
 there unites with the hydrate of soda, which, by combining with it, becomes liquified. When all 
 the hydrate of soda becomes liquified more must be added, or the whole of flic spirit may be dis- 
 tilled off and fresh hydrate of soda placed in the boiler :ind the spirit returned to it. The apparatus 
 is substantially made in copper and brass. 
 Duty Free 31.50 Duly Paid 47.25 
 
Cold t'loset. Large Model, for uuiiiitainiiig :i constant teinpeiatuit: uf — 15° C, as supplied by us to the 
 laboratories of Henry Phipps Institute, Philadelphia, where it is giving the best of satisfaction. 
 With careful management at ordinary room temperature the closet will maintain a temperature 
 under the freezing point for six to eight days at a time with one filling of ice and salt. 
 
 Inside dimensions, cm .60 x 5 x 50 100 x 50 x 50 
 
 Duty Free '. USTSS 190.60 
 
 Duty Paid 180.40 231.00 
 
 Cold Closet, "Frigo," for maintaining a constant temperature of 8 to 12''C for the i r(.>-trvitiou of 
 sera, ferments, urine and other biological products, Etononu tl in use of ice md md,mtams 
 temperatures much lower than ordinary rcfrigeratore Size 3o \ 22 \ 2U cm mside dimensions 
 Duty Free 46.75 Dut\ Paid 57 00 
 
 Cold Closet, "Frigo," similar to above but 40 X 30 X 30 cm iii^L I f itn| i it le from S to 12° C 
 
 Duty Free 136.15 Dut\ Paid 165 00 
 
STAUDINGER ANALYTICAL BALANCES 
 
 The three Staudinger Analytical Balances licrciii listed were first introduced by us into the United States 
 in 1899, since which time we Inve ]n-<-n tlie snie United States agents for the maker, Wilhelm Spoerhase of 
 Giessen, Germany, success r I ll f Mini t ( iil btaudmger e'ntablished m Giessen m 1842. 
 
 During this period we haie supplied these Balances to practically every Universit} College and Technical 
 School in the United States I r th ligPiTTnnPr tip uch as the University of Pennsylvania. Cor- 
 
 nell University, etc., there i ^ I t rr l\ \ P il i -5 in actuil use the same type of instrument 
 
 having been repeatedly or II t t [nit hftecn ^eni 
 
 21304. Balance, Staudinger Analytical No. 1. This Balance is designed for work in which high serusibiUty is 
 required. In general eonstruetion it is the Htaudinger modification of the usual German type, 
 where the beam and pans are released simultaneously. By means of a patented rider sliding 
 on the pointer varying degrees of sensibility are attainable and, for this reason, the No. 1 is 
 adapted to a great variety of work. The scale is furnished with two divisions, one being for use 
 with, and the other without, the reading microscope. The center of gravity of the system may 
 be adjusted by the rider on the pointer so that 1 mg. equals I degree of the macro scale. The 
 micro scale then divirles this degree into tenths so that a direct reading to -jV ™g- 's attained 
 through the microscope. The action with this adjustment is very rapid and the sensibility re- 
 mains constant under varying loads. By raising the rider on the pointer 1 ing. equals 5 and finally 
 10 degrees on the macro scale so that by using the microscope to read the subdivisions on the 
 micro scale sensibilities of J-r and ,'„ mg. are readily available. The times of a complete 
 double swing for the three sensibilities are as follows: ,'„ mg. = 14 seconds; ■■'-. mg. = 20 seconds; 
 ■;5 mg. = 30 seconds. 
 
 de doors and roiinterpoised front tian 
 
 Capaci y g 
 Sensib ty 
 
 Base — o h gh 
 Beam— t ha 
 Knife Edges and 
 Release and A e 
 
 and pans 
 Rider Carrier — Patented btaudirger conatniotion lifting tlie rider vertically ir 
 Pan» — heavily platinum plated. 
 Pi nlsli— excepting magnalium beam all metal part? are hoavilv platinum plated or, if to specified, gold plated. 
 
 Duty Free 90.00 Stock 125.00 
 
 ed head, tiaif t 
 
 which aimiiltaneously n 
 1 straight line. 
 
 . hangers 
 
 The stock prices of the Staudinger Balances have been malerially reduced since the operation 
 of the new Tariff Act of 1913. 
 
Balance, Staudinger Analytical No. 2. This Balance is of the same general construction as the No. 1, 
 with some simplifications and generally more robust construction, designed to stand heavier 
 work where such high sensibility is not required. It is used in many laboratories for advanced 
 student work as well as in industrial laboratories. 
 
 Capacity — 200 grams. 
 
 Sensibility^iiiider full load l-IO millieram. 
 
 Case — of polished mahogany, with side doors aad coui 
 
 Base— of highly polished and beveled black glass. 
 
 Beam^f hard welded magaalium, highly polished, 13 
 
 Knife Edges and Planes— of agate throughout. 
 
 Release and Arrest — by means of a centiilly placed milled head half 
 
 Rider Carrier — patented Staudingf 
 
 Pans — heavily platinum plated. 
 
 Finish — heavily nickelled with the exception of polished magnah 
 
 poised front door. 
 
 of svhieh shnultaneourily rfleasea beam, hangers 
 construction lifting the rider vertically in a straight line, 
 beam and platinized pans. 
 50.00 Stock 70.00 
 
 Balance, Staudinger Analytical No. 3. This Balance is deservedly the most popular of the three and 
 lias been supplied by us in the past fifteen years to most of" the principal colleges and universi- 
 ties in the United States and to many other laboratories. It has been designed primarily for 
 students' use in quantitative work, and over 75 instruments are in use in some of our largest uni- 
 versities in the East, having been repeatedly ordered over a period of fifteen years. All of the 
 essential features of Staudinger construction and design are incorporated and the instrument 
 differs from the preceding Balances only in the matter of simplicity of finish and construction 
 and sensibility. 
 
 Capacity — 200 grams. 
 
 Sensibility — regular adjustment is 1--t nig. etiuals 1 degree of «'ale. Mi 
 Case — of polished mahogany. 
 Base — of poUahed black slate. 
 
 Beam— of hard welded magnaliiim, highly polished, 13cm long, 
 , Knife £dees and Planes — of agate throughout. 
 Release and Arresl^by means of a centrally placed milled head half 
 
 and pane. 
 Rider Carrier — patented Staudinger construction lifting the rider vertically 
 Pans — heavily platinum plated. 
 Finish — with the exception of the pans which are platinum plated and the magnaiium beam, 
 
 in a dull bliick finish particularly resi.stant to laboralory fume.'i. 
 
 rc.ld Id 1-10 nig. Cfniala J degree of scale, 
 
 of which simultaneously releases beam . hangerB 
 straight line. 
 
 metal parts are lacquered 
 
 Duty Free. 
 
 32.00 
 
 Stock 45.00 
 
 Balance, Analytical, Sartorius Model "U. S. A." This new balance which has been specially designed 
 for use in educational laboratories, has been very popular throughout the U. 8. This Balance 
 is of the German type, i.e., with simultaneous arrest of beam and pans and is fitted with Sar- 
 torius' patent compensation suspension and circular form of arrest as used on all Sartorius bal- 
 ances. 
 
 Capacity— 200 grams. 
 
 Sensibility— 1-10 milligram. 
 
 Case — of polished walnut. 
 
 Beam — of aluminum. 
 
 Knife Edges and Planes— ot agate throughout. 
 
 Duty Free 39.00 
 
 Stock 50.00 
 
Balance, Analytica . Becker No. 1. This ly a !ii(ih-tira<le analytical Balance, manufactured for us by 
 the renowned farm of Becker s Sons, Rotterdam, and has long been in use in many leading lab- 
 oratories. It IS particularly adapted, b.Tausc of robust construction, quick action and great 
 sensibility, to the requirements of in.lu.sl rial laboratories and is highly recommended for such 
 work. ' 
 
 Capacitj — 200 grama. 
 
 Senaibility~l-20ini]]iemiii. 
 
 Case— of highly polianed, well-seii.>«.in!d iiiulio^uny, « it.h counterpoiHed front <i™.i 
 
 Base — of beveled glass. 
 
 Beam— of aluminum, fi inches long, Graduated to 1-10 milligram. 
 
 Knife Edges and Planes — of agate throughout. 
 
 Release and Arrest— beam is arrested by center milled head and pans are arresicrl separatclv 
 
 
 inetal parts are proteetud by gold laefjiier very resistant to labora- 
 
 Duty Free 68.75 Stock 125 00 
 
 Balance. Analytical, Becker No. 7. This Balance is also made for us bv Becker's Sons, Rotterdam. 
 and IS esfjecially recommended for students' use and for industrial laboratories where a higher 
 
 kIc and at the same time sufficiently sensi- 
 
 
 priced Balance is not required. It is substantially ii 
 
 tive to give close results. 
 
 Capacllr — 100 grams. 
 
 Senslbilily— 1-ln milligram. 
 
 Case— of highly jKilished well-Seasoned mahogany with counterpoised 
 
 Beam— of ^iliiniii^um, fi inches long, graduated to 1-10 milligram. 
 
 Knffe Edges and Planes— of agate throughout. 
 
 Release and Arrest— provided with the improved pan arrest with arr 
 
 ends of the beams when the balance is at rest, as in the lugher 
 
 balances of corresponding price. 
 Pans — of polished German silver. 
 Finish— with the exception of the polished aluminum beam all metal part? are Incouered 
 
 Duty Free 36.00 Stock 65 00 
 
 ce. Analytical, Troemner No. 10. This Balance is in extensive use in industrial laboratories 
 throughout the country, also in many of our leading universities, and needs no introduction. 
 
 Capacity— 31)0 Erams. 
 
 Sensibility- 1-211 milligram. 
 
 Case— of ol.l, wu II- seasoned mahogany, French polish: the 
 front .^a^h is counterpoised r opening up the full 
 "idlh of ihe case. The rear sash also slides up, al- 
 lowing the weighing of long objects to extend beyond 
 the outside lines of the case. The top and ends are 
 also fitted with glass sash, thus securing plenty of 
 light from all directions. 
 
 Base— top is covered with a black plate glass. 
 
 Beam— of cold rolled aluminum, having more than three 
 times the tensile atrongth of pure aluminum, oni- 
 dized black with a non-corrosive preparation, and 
 divided into fifty parts each side of the center knife 
 
 hniFe Edges and Planes— of agate throughout. 
 
 Kelease and Arrest— rt-lea-sinB; arms are of simplest construc- 
 tion witli tliree pnneipal parts, swinging up to hold 
 tnr! iH-ani :i]n| down to relea.'^e it and operated by a 
 
 1 front of case, constructed s 
 bring their axes coincident with the contact line at 
 the centiir knife edge iind hold the beam firm and 
 secure when the Balanee is being loaded or unloaded. 
 
 Pans-of aluminum, :! mchcs diameter, of fiat shape and 
 adjustable on the arehcs. Arches are of cold drawn 
 nickel silver, gold plated. 
 
 Finish— all brass parts are gold plated. 
 
 ^to*^** 125.00 
 
A New Analytical Balance 
 
 TROEMNKK NO. ,'>() 
 
 MADE BY IIKNllV lHOEMNElt. PHILADI' 
 
 liTirrH If. THOMAS ( 
 
 21340. Balance. Analytical, Troemner No. 50. After long cooperation with the firm of Henry Troemner, Phila- 
 
 delphiji, we are enabled to ofTer ;t Balance at $50.00, bearing his name and guarantee, but made 
 
 specially for us, wliifli will satisfactorily meet all the practical requirements of the analyst as 
 
 well as any Balance now listed at $125.00. We will send this Balance to any responsible chemist, 
 
 subject to trial and approval and returnable at our expense if not satisfactory. This Balance 
 
 is particularly recommended to industrial chemists because of its rigid and robust construction 
 
 and is guaranteed to stand the daily wear and tear in a works laboratory. 
 
 Sensibility — The Balance has a definite sensibility of f'u milligram under full load of 200 grams 
 in each pan. 
 
 Capacity— 200 grams in each pan. 
 
 Case— The case is of French polished mahogany with counterpoised front sash, with glass sash 
 at the back, top and both ends. The base is fitted with a drawer and is provided with screw 
 leveling feet. 
 
 Beam — The beam is of aluminum alloy, 7 inches long and is graduated on the right arm into 
 fifty divisions. The special feature of this beam construction is that it is designed to sup- 
 port successfully without flexture a load of 200 grams in each pan, and that the knife edges 
 are set rigid in the beam, thus doing away with any possible shifting which would make the 
 Balance inaccurate and undependable. 
 
 Release and Arrest — -The beam is supported by a three point rigid beam arrest that has a 
 full-away action and releases the beam so that the contact at the center knife edge is coin- 
 cident with the contact at the end knife edge, thereby avoiding all jarring and possible 
 injury to the knife edge by a sudden shock. 
 
 Rider Carrier — The rider carrier is very simple in construction and is designed to be thoroughly 
 effective and free from any possibility of derangement. 
 
 Bearings — Of agate throughout. 
 
 Pointer Scale— The ivory pointer scale is recessed (see illustration) so that the end of the 
 pointer moves in the recess and in the same vertical plane as the divisions on the scale, 
 thus avoiding all errors of parallax and making accurate readings convenient and rapid. 
 
 Pan Hangers — Of extra width and shape to conveniently accommodate a Vanier Potash Bulb. 
 
 Price 50.00 
 
 21341. Balance. Analytical, Troemner No. 65, exactly the same as No. 50 but with beam divided on both sides 
 
 of the central knife edge instead of on the right-hand side only as in the No, 50, and with black 
 polished plate glass base inside of the case 65.00 
 
A R T H U R H. THOMAS COMPANY 
 
 RUEPRECHT PRECISION AND ANALYTICALIBALANCES 
 
 As supplied b> us to laboratories in leadint; institutions throughout the United Stales for the highest grade 
 
 of research work. 
 
 Balance, Precision, Rueprecht, a balance ul' great precision anil large carrying capacity, constructed 
 upon the well-known Rueprecht system, with all moving parts heavily gold plated, in mahogany 
 
 Capacity grams 600 1000 2000 5000 
 
 Sensibility, milligrams 0.1 0. 1_ _P-^ 0.5 
 
 Duty Free 220.50 248.00 330.75 427.25 
 
 Duty Paid 305.25 343.50 458.00 591.50 
 
 with automatic device for removing and placing ■ 
 aiigcnient for variable sensibility. 
 
 ..." 200 tiOO 
 
 0.05 0.1 
 
 Balance, Precision, Rueprecht, a.'^ ;ili' 
 on the right-hand beam and witl 
 
 < 'apacity, grams 
 
 Sen.-sibitity, milligrams 
 
 Duty Free 215.00 344.50 
 
 Duty Paid 300.00 477.00 
 
 Note — The above Balances can be furnished in case constnnli-d entirely of br; 
 glass at an advance of approximateh- 20' f.. 
 
 .■eighta 
 
 2000 
 
 0.2 
 
 496.10 
 
 6S6.85 
 
 : and mirror plate 
 
 1000 
 
 1 
 
 385.85' 
 
 534.25 
 
 Balance, Analytical, Rueprecht, in fine mahogany ( 
 
 Sensibility, milligrams 
 
 Duty Free 
 
 Duty Paid 
 
 i'ith beam 200 mm long; 200 grams capacity. 
 
 0.1_ .05 
 
 124.05 132.30 
 
 171.75 183.15 
 
 Balance, Analytical, Rueprecht, as above, but with shortci- beaut, i.e., 150 mm long; 200 grams capacity. 
 
 .Sensibility, milligrams 0.1 ,05 
 
 Duty Free "124^05 132730 
 
 Duty Paid 171.75 183.15 
 
 Note — Either of the above Balances can be furnished in case composed entirely of brases and mirror plate 
 glass at an extra cost of 835.85 duty free and S49.60 duty paid. 
 
COM 
 
 No. 2137fi 
 21376. Balance, Technical-Analytical, Staudinger. a convenient balance foe quick and exact weighings on 
 the lecture table and for students' work. With beam and hangers of magnalium and agate 
 bearings and knife edges. Case is of mahogany with sliding front door and base is of black marble. 
 
 Capacity, grams 100 200 -500 1000 
 
 Sens bit 11 "ran s 05 123 
 
 3*95 .39.70 44.70 
 
 39 ^n 47.65 53.65 
 
 Balance, Physical-Analytical, Staudinger. Recommended as a Balance of great precision with large 
 carrying capacity. 1000 grams capacity, sensibility by means of reading microscope lU milli- 
 gram; with adjustment for sensibility, agate bearings throughout, Argentan beam 35 cm long, in 
 fine mahogany case, with black mirror plate glass base. 
 Duty Free 255.00 Duty Paid 357.00 
 
' and will operate smoothly aod withoul lubri- 
 ■dth^ eich division representing 1-lOOthe weight 
 l^a^llght amount of end play in the sliding bueh- 
 
 nder without disturbing the reading, a greatly 
 
 Price 300.00 
 
 Balance A sa Ainsworth Type C with Impro\ed Multiple Rider Carrier. As used by leading assay- 
 (,rb, t>rritltirs and iiiilU wliert a Urge number of accurate weighings are to be made. The carrier 
 can be attiK'hcd to any of the other Ainsworth Balances. Each weight or rider has an indi- 
 vidual anil, cannot be misplaced andean be operated with beam in motion. The numbers on 
 the arms down indicate the wciffht of the riders on the beam and, when through weighing, all 
 
 riders are reset sir 
 
 Sensibility — adjusted to :i 
 Case — of mahogany witlj 
 Beam — of truss form , u i 
 from to the full 
 Rider Carrier — similar in 
 Finish— all metal parts ar 
 
 Price 
 
 y>y a reverse movement of the thumbpiece. 
 - i ii milligram and afterwards reduced to 1-200 milligram to 
 liijg door, 20 X 17 X 10 inches, 
 "I- unobstructed on top, divided in 50 parts on either sidi 
 
 ■ rapidity. 
 
 ■ heavily gold plated. 
 
 ivened tjpe, No. 
 
 581. 
 
Balance, Assay, Troemner's New Form, No. 30. This is an cjiUrcly nuw li-.i 
 demand for a low priced, short arm Balance with a sensibility ol" 
 action It requires but 13 second? foi one (omplete oscillation 
 Sensibilih— ) lUU niilligrit 
 
 1 1 Umg forejLh h 
 
 iah— all the Urj 
 Price. . 
 
 
 E ite — accurately grounU 
 k pattern operated from nt,lit 
 lioul U can be placed at d,n\ dn isi 
 V covered with an impervious lacquer. 
 
 125.00 
 
 Balance, Assay, Staudinger No. 22b. This instrument is devised specially to meet the requirements 
 of students' assay work in the U. S. at a low price. A large number of these instruments are 
 now in use in this country, and no other balance of similar specifications is offered at a corre- 
 sponding price, 
 rapadly-l'et-um.". 
 
 Sensibility— 1-.50 mg. but will easily show 1-100 iiig. 
 Case^-ol" Tiiahogany. 
 Beam — of magnalium, 200 mm long. 
 Knife E(l);ca and Planes — of agate throughout. 
 Release and Arrest— tlie arrestment of beam hangers u. 
 
 Duly Free 
 
 36.00 
 
 Balance, Assay, Pocket. Improved form with eccentric lift for beam. Size when closed is 6 x 2f x 1^ 
 inches. Capacity 10 grams; sensibility I mg. Complete with set of weights. A half assay ton 
 weight is usually supplied in place of the 10 gram piece 16.50 
 
 Balance, Micro, Nernst. This Balance is based upon the 
 torsion of a very fine quartz fibre and is used for 
 weighing small crystals and for carrying on micro- 
 chemical reactions with accurate observation of 
 change in weight. The Balance is mounted securely 
 and by means of proper arresting device may be 
 shipped with reasonable safety. Full instructions 
 for operation accompany each Balance, Capacity 10 
 ing; sensibility i_„\,„ mg. See Berichte der D. Chem. 
 Gcsellsch. Jahrg. XXXVI Heft 10 und Jahrg. 
 XX XVI II Heft 1. 
 
 Duty Free 37.95 
 
 Duty Paid 43.70 
 
 Reading Microscope, Emich, for use with above Nernst 
 Balance, on adjustable stand, with counterpoise for 
 the Microscope, See Emich, Lehrhuch der Mikro- 
 rhemie, Wiesbuden 1911. 
 
 . Duty Free 21.45 
 
 Duty Paid 28.60 
 
Balance, Lecture Table, Staud nger e t, e i p ul r y fo pe ment he e ate currying 
 capacity is required; capa y 00 g n en b lt> 1 cent t, am Bea i d into 100 
 
 equal divisions with zero at he eft I a is ie so at a 50 centigram platinum ndt r ma\ be used 
 with a value of 100 centigrams at the right-hand end of the beam. Beam is of bronze with agate 
 bearings and planes, on heavy mahogany base; with levelling screws 
 Duty Free 75.00 Duty Paid 105.00 
 
 Balance, Lecture Table, :i5 above, but with covering case of glass and mahogany 
 
 Duty Free 105.00 Dutv Paid 147 00 
 
 Balance, Decimal, Mach, specially con- 
 structed for weighing precise 
 quantities of substances for an- 
 alysis, particularly in sugar, ferti- 
 lizer and brewery laboratory prac- 
 tice or other work where large 
 numbers of consecutive weighings 
 of equal charges are to be made. 
 The usual method is to use a 
 scoop, counterpoised on the scale 
 pan with lead shot placed in the 
 circular box under the hangers at 
 the short arm of the beam. If 20 
 grams of a substance is to be 
 weighed, a 200 gram weight is 
 placed in the rear of the short arm 
 pan and the scoop on the front 
 scale pan charged until the pointer 
 comes to zero. Capacity 100 
 grams, sensibility 1° of scale = 1 
 milligram. Balance is furnished 
 in mahogany case with metal parts 
 heavily nickelled. suitable for use 
 in the tropics and with base plate 
 of polished mirror plate glass. 
 
 Duty Free 25.90 
 
 Duty Paid 34.5O 
 
 Balance, Decimal, Mach. as above but 
 with pointer at the left-hand side 
 instead of in front, and with side 
 doors. 
 
 Duty Free 27.40 
 
 Duty Paid [ 36.50 
 
No. 2142« 
 
 Balance, Lecture Table, for weighing large flasks and other containers ind tKo for lecture table use; 
 with adjusting arrangement for end knife edges; beam is of aluminum ami support black enam- 
 elled. It should be noticed that this balance is frequently offered with an iron beam, in which 
 case the sensibility is greatly diminished. 
 
 Capacity, kilos 1 5 10 
 
 Sensibility, mg 10 30 50 
 
 Duty Free 18.00 2S.50 36.90 
 
 Duty Paid 21.60 34.25 44.30 
 
 Balance, Lecture Table, same as No. 12142S but in glass case with oak frame. 
 
 (Capacity, kilos 1 5 10 
 
 .Sensibility, mg 10 30 _50 
 
 Duty Free 28.50 43.80 .56.10 
 
 Duty Paid 34.25 52.60 67.35 
 
 Balance, Laboratory, for school and lecture 
 table work, with black enamelled iron 
 base and pillar, with damping device for 
 quick arrestment. The beam is of brass 
 heavily nickel plated and divided into 
 100 parts and carrying a rider weighing 
 up to 10 grams without weights. The 
 bearings and knife edges are of hard high 
 grade steel and the balance is supplied 
 with levelling screws. Capacity 2 kilos, 
 height of bows 35 cm, diameter of pans 14 
 cm.' length of beam 32 cm, sensibility 20 
 miliigrani. 
 
 Duty Free 9.00 
 
 Stock 12.50 
 
 Balance, iis above, but with agate knife edges. 
 
 DutvFree 12.50 
 
 Stock 16.80 
 
21448. 
 21452. 
 
 No. JI444 No. 21J4,S No. 21)36 
 
 nee. Pulp, for sugar, ore, pulp, etc., smaller sizes widely used aa prescription scales, 
 device extends to hangers, knife edges and planes are of steel, on polished mahogany I 
 drawer smd levelling screws. A very satisfactory and widely used balance. 
 
 300 
 
 mt 
 
 Bulai 
 
 100 
 20.00 
 
 300 
 33.00 
 
 GOO 
 38.00 
 
 Capacity, grams. 
 
 Sensibility, milligrams 1 1 
 
 Diameter of pan.?, mm 65 80 
 
 Each 12.00 16.00 
 
 nee. Pulp, same as above in mahogany case, with sliding glass door. 
 
 Capacity, grams 75 180 
 
 Each 22T06 25.00 
 
 Balance, Pulp, exactly the same as Ko. 21444, but with agate knife edges and planes and w 
 lar spirit level mstesid nf plumb bob. 
 
 Capacity, grams 100 
 
 Sensibility, milligranis 1 
 
 Each 22..'J0 
 
 Balance, Pulp, exactly same as No. lil4.5L*, hut with marble top on the mahoganv base. 
 
 rapacity, siriim^ '. . . 250 
 
 Each 20.00 
 
 arresting 
 lase with 
 
 1500 
 
 10 
 
 150 
 
 .33.00 
 
 1500 
 50.00 
 
 th eircu- 
 
 500 
 22^00 
 
 No. 21Jfin N0.2UW 
 
 Balance, School Laboratory, with open beam, agate knife edges and planes, aricst for both beam and 
 haufici's, levelling screws and plumb bob. with divisions on beam for use of rider. 
 
 Capacity, grams HH) 250 
 
 Sensibility, milligrams 1^ 3 
 
 Duty Free 10.00 12.00 
 
 Stock 15.00 16.50 
 
 Balance, Staudinger School, with agate knife edges and planes, improved beam and hanger arresting 
 device, nil }k;ivv wooden base with levelling screws, with removable pans, liecommended as 
 
 the ni<' ■■>', ;ind satisfactory school laboratory balance of its type. 
 
 Cap:ii^ I ■ '■ . 11)0 250 
 
 Sensil.ihi^ , unWivvumn 1 o 
 
 Duty Fret- 
 .Stock 
 
 12.00 
 16.00 
 
 13.50 
 17.50 
 
Balances, Magnalium. Many so-called m;iiinaliinn liulances have unly the byaiii, pillar ami pitiis 
 made of magiialium, the remaining p:<rts lieiini of bras.^. On this accuunt they iU\ not resist 
 acid fumes much better than ordin;tT y h:il:iTiics. These balances are made entirely of mag- 
 nalium insofar as the metal parts are concerned. With agate knife ed^es and planes. 
 
 Capacity, grams 100 2.50 
 
 Sensibility, millip;rams 3 5 
 
 Duty Free 10.00 ~ 12.50 
 
 Stock 13.25 14..50 
 
 Balance, Magnalium, same as abo\'i> bul in uhiss :in<\ Tnai;n!iliiini case, and with rider carrier. 
 
 Capacity, grams 100 250 
 
 Duty Free 26.10 27^0 
 
 Stock .34.80 37.20 
 
 21476. Balance, Laboratory, for general laboratory work, open beam fitted with adjusting screws at both ends 
 The pans are 75 mm in diameter and nickel plated. Case is of polished mahogany with glass sides 
 and top, sliding door, levellingscrews and spirit level. Capacity 100 grams, sensitive to ^ mg 25.00 
 
 21480. Balance, Laboratory, same as No. 21476 but with agate bearings 30.00 
 
 21484. Balance, Prescription, of brass with nickel plated pans 3 inches in diameter. Beam 9 inches long with 
 adjusting screws. Sensibility 2 mg _ 9.00 
 
 21488. Balance, Prescription, of brass, on wooden base, with drawer. Beam 6 inches long, pans 3 inches in diam- 
 eter. Without adjusting screws at end of beam. A useful Balance at a low price 6,00 
 
€^'=^ i 
 
 Balance, Jolly Spiral Spring, with new patent reiiding scale- The inn( r tube i.an be adjustfJ up 
 or down by nieaiiH of the milled head and is graduated in mdlinieterb with -verniei reading to 
 p'l, mm. This Balance has been found very convenient in many industrial laboratories, such as 
 in rubber works, for taking specific gravities 25.00 
 
 Balance, Specific Gravity, Sartorius, for both liquids and solids. This Balance is much superior to 
 balances of the same type made by other manufacturers. The outfit includes Eeimann's Plum- 
 met for liquids, pan for solid bodies, jar, special thermometer and rider weights reading to the 
 fourth decimal place. 
 
 Duty Free 22.50 Stock 30.00 
 
 Special Thermometer, only " 3.00 
 
 Set of Riders, only " 1.50 
 
 Jar, only " 30 
 
 Reimann's Plummet, with thermometer " 75 
 
 Balance, Specific Gravity, Westphal. For the determination of the specific gravity of liquids up to 
 
 the fourth decimal place. AVith jar, riders and Reimann's Plummet 12.00 
 
 Reimann's Plummet, only 2.00 
 
 Jar, only .30 
 
 Set of Riders. ..ti'v 1.50 
 
 Balance, Triple Beam, capacity 111 grams with a sensibility of ^ centigram. One beam reads from 
 10 trrams to 100 grams in divisions of 10 grams, the second from 1 gram to 10 grams in divisions 
 of i gram and the third from 1 gram to 1 gram in divisions of 1 centigram. 
 
 Duty Free 11.50 Stock 15.00 
 
 Balance, Hand, with polished brass beam, steel knife edges, horn pans and silk cord. 
 
 Length of beam, mm 160 175 200 
 
 Diameter of pans, mm 60 7.^ 90 
 
 Each 1.50 1.75 2.00 
 
ARTHL'R H. THOMAS COMPANY 
 
 21)l_ 
 2151() 
 
 Balance Har\ ird Trip with ^(|ii:ij'i' ur lu 
 
 bi \iji ^1 iiimtcd up too grams in ; 
 
 Palante Roberiahl tui coarse weighing 
 
 No. 21540 
 (ilain plates inclies in diameter. 
 
 ni jiijii'tilain plates inclies in diameter. Capacity 1 kilo, 
 
 grdma ;. . . 6.00 
 
 with metal base and brass pans but without side beai 
 
 ' i]>i.'lT^ kins 1 3 5 I 
 
 i)i imr tet of pins mm 125 1.50 
 
 Eich 2.80 3.60 
 
 Bal ince Counter in eliony box with marble top and hfavily nii'kcl plated pans. 
 
 Di imetei if ] \n inches 7 
 
 <"^p^rlt^ II _ 10 
 
 Each 14.00 
 
 Balance Troemner Trip. A vL-vy substantial and rcdiablft scale, with nne heavv, 
 iemo\ ible Uintmented in black and gold. 
 
 Di inif tti ot pins inches ,s 
 
 < ^pl(lt\ II s 2 
 
 Each (i.OfT" 7.00 8.00 
 
 i ilince Prescription \ er>' convenient in laboratory and )iii:inii;iceutieal work. Pans 6 inches in 
 dnmetei h. i\il\ nickel plated. Capacity 500 grams in each jian, sensitive to 5 centigrams. 
 1 [Iff iiii liid(s full set of weights from 200 grams to 1 centigram, neatly fitted in base 10.00 
 
 Palante 'Moisture foi determining the percentage of moisture in ores, etc. Beam is divided on the 
 1 ] inl< uii cs and on the bottom into percentage of 100 to 0. Including a set of iron weights 
 fi rim _ 11 to J- oz. Avoirdupois 10.00 
 
 Bal ince Solution \A ith tw-o weighing beams and sliding poises, one divided into 100 parts each 
 icpresentmg 1 gram; the other into 10 parts, each representing 100 grams. A bar with a sliding 
 poise IS placed under the weighing beams to balance the emptv bottie or container, which is 
 ]ni( I h flrne h\ liding the poise along the bar 25.00 
 
 BaUnce New Dispensing. Wry convenient for rough prescription work or laboratory weighing, 
 r in J in !i( III di:iiiietcr, hcavih- nickel plated. Beam divided into decigrams". Capacity 
 l'»0 -T ini IiKluding set u( bras.s weights from 50 grams to 1 centigram, fitted into base. 9.00 
 
 200 
 
 226 
 
 4.50 
 
 6.00 
 
 s 
 
 9 
 
 15 
 
 20 
 
 16.00 
 
 18.00 
 
 hr.iss pan 
 
 vhich is 
 
 
 
 12 
 
 li 
 
 10 
 
■'"?:», 
 
 21552. 
 21556. 
 
 21.5^4. 
 
 21568. 
 
 e. Torsion, with ghis.s ra.se and cover and slide beam with ruler carrier operating from outside 
 ('.[[jiuily J-o [irarnw in each pan, with beam reading to 500 milligrams by 5 milligrams; pans 7.5 
 
 <rii ill diamef.or; sensibility 1 milligram 40.00 
 
 Hydrostatic Attachment, extra 10.00 
 
 Balance, Torsion, with mechanism entirely enclosed in glass case with German silver corner posts and 
 nickel plated base; nickel plated brass pang 23 cm in diameter. Capacity 4.5 kilos in each pan, 
 beam reads to 100 grams by 1 gram, sensibility \ gram. Rider on beam is manipulated from 
 outside the case. With slide beam inside the case controlled by weight mover from the out- 
 side 35.00 
 
 Balance, Torsion, with 9 inch beam and 6 inch nickel plated pans. Capacity 5 kilos. Beam divided 
 
 to 300 grams in 2^ gram divisions. Sensitive to about 1 gram 13.50 
 
 Arresting Device, extra 2.00 
 
 Balance. Torsion, with tare weight. Bottles, dishes or other containers can be tared by sliding tare 
 weight on upper beam, facilitating weighing and avoiding errors. Capacity 2.3 kilos in each 
 pan, slide beam 100 grams by 1 gram, sensibility 7 centigrams, with nickel plated brass pans 
 lo cm flianieter; with arresting device 20.00 
 
 Balance, Torsion, similar to No, 21572 but of larger capacity, i. e., 4.5 kilos in each pap with a sensi- 
 bilily of 15 centigrams; pans 23 cm in diameter; with slide beam divided into 45t) grams by 5 
 grams; with arresting device 22.00 
 
 Balance, Solution, Metric. For rapidly making accurate reagents or other kind of composite solu- 
 tions, with two movable brass pans. Price includes weights of solid brass. With side beam in 
 front, undivided, for balancing the bottle or containers. 
 
 Capacity, kilos 1 5 
 
 Diameter of pans, inches 5J 9 
 
 Each 16.00 20.00 
 
ARTHUR 
 
 THOMAS COMPANY 
 
 
 Balance Torsion i-. im ^ muK ti 1, II ' i il n I i i I u 1, I ^ ! tUn ntnf Agriculture. 
 Willi-li i, Ic nil iiMl li in |i I I I 1 il nsibility 7 centi- 
 ,1 mis Willi pnmluii pi il< I M I III I I I 18.00 
 
 Balance Torsion t n m i tun i ul u i II I i i i i I il j rcL^ntage beams 
 
 so th\t 1 Q to 30' c oi imnatuii i m in li ti iniun 4 with mt i il' ill iIh n wIk ii 10 gram samples 
 aie u'9ed By means of tno tare beanib one oi more dishes can be balinced and recorded. Aa 
 used m butter testing paint and viinish testing kbnntorns etc ^\ ith 10 p;ram weight.. 15.00 
 
 View in Slock Room Shoniiis; Arranyf men( uf Porcelain Evaporaline Dishes 
 
THOMAS COMPANY 
 
 ANALYTICAL WEIGHTS 
 
 One piece Weights of Tobio brotue, made according to the deaignsof the 
 Lur<»au of Standards, for yse as Primary Standarda, guaranteed to be within 
 tht tolerances established by the Bureau for Clasa A (now class M) are quoted 
 upon application. Certiflcatea for Analytical Weights of Gortnaa manufacture 
 such IB No. 21800 are furm'shed from tlw Kaiseilichen Normal-Eichungs- 
 K n m Bsion of Berlin, a 
 
 21614. 
 21616. 
 
 Balance Weights. Analytical, with gram pieces heavily gold plated and with fractional pieces of plat- 
 inum except the 1, 2 and 5 mg which are of aluminum and two 10 mg riders. In velvet lined, 
 polished mahogany box, with ivory tipped forceps and fractional pieces covered by glass plate. 
 These weights are adjusted with sufficient accuracy for the highest grade of analytical work. 
 
 Sets, 1 milligram to grams 20 .50 100 200 500 1000 
 
 Duty Free, per set 7.15 8.00 "9^50 12.T5 15^6 18.50 
 
 Stock, per set 10.75 12.00 14.25 18.25 
 
 Balance Weights, Analytical With Certificate, exactly the same as No. 21600 but with certificate of the 
 Kaiserlichcn Normal-Eichungs-Kommission of Berlin. 
 
 Sets, 1 milligram to grams 20 50 100 200 500 1000 
 
 Duty Free, per set " 12.75 14.50 16.85 20.25 24.00 2^70 
 
 Stock, per set 22.15 26.00 
 
 Balance Weights, Analytical, exactly similar to No. 21600 but with brass pieces carefully lacquered 
 instead of gold plated. This set avoids the high duty on platinum and gold plated articles under 
 the Tariff Act of 1913. By many experienced laboratory workers the lacquered finish is con- 
 sidered preferable to the gold plating. 
 
 Sets, 1 milligram to grams 50 100 200 500 1000 
 
 Duty Free, per set 6.85 8.00 10.50 13.00 16^ 
 
 Stock, per set 8.25 9.75 
 
 Balance Weights, Analytical, Troemner, in mahogany block with removable cover, gram pieces care- 
 fully lacquered and fractionals of platinum and aluminum. With three 5 mg riders. Fractional 
 pieces have one entire edge turned into vertical position for convenient handling with forceps. 
 
 Sets, 1 milligram to grams ,50 lOO 
 
 Each 19.00 21.00 
 
 Balance Weights, exactly as above but with Bureau of Standards Certifieate 27.00 29.50 
 
 Balance Weights, Analytical. Becker's Sons, Rotterdam, exactly similar in accuracy and finish to No. 
 21612 and mounted in similar case. This set can also he furnished with Bureau of St;indard8 
 Certificate. With three 6 mg riders. 
 
 Sets, 1 milligram to grams .511 iQO 
 
 Duty Free, per set 8.50 9.6O 
 
 Duty Paid, per set I4.OO 16.00 
 
 Balance Weights, Analytical, fraction;il sizes only. Same as those supplied in sets No. 21600 and 
 adjusted to the same accui'acy, I, 2, and 5 milligram pieces of aluminum, larger pieces of plati- 
 
 Size 
 
 1 2 5 milligrams .01 .02 ,05 .1 
 
 ,2 .5 grams 
 
 ce Weights, Analytical 
 
 No. 21600. 
 
 Size, grams 
 
 Each 
 
 .10 .10 .10 .25 .30 .45 .60 
 
 Single pieces of brass, gold plated. Same accuracy 
 
 1.25 1.75 
 
 as supplied hi sets 
 
 1 2 5 10 20 
 
 .40 " .45 .60 .70 " .80 
 
 50 100 
 MO 1.75 
 
 Note— Riders of convenient shape and size for all standard Analytical Balances will be sent with our 
 Analytical Weights from stock if customer will please specify make and type of Balance in or- 
 dering the Weights. 
 
'% ♦*'*"1 
 
 'W^m' 
 
 -Q= — O Q 
 
 216.111. 
 21640. 
 
 Balance Weights, Analytical, with f^ram pieces nickel piateii and fractionals of German silver. A 
 good set for students' analytical work, the sets being accurately adjusted. In mahogany case 
 
 with forceps. Sets, 1 milligram to grams 50^ JlOO 
 
 Per set 5.00 6.50 
 
 Balance Weights, Standard, for sugar analysis. 
 
 .Size, grams _ 1 3.02 4 26.04 8 52.096 
 
 Each .80" .90 " I.OO 
 
 Balance Weights, Standard, for sugar analysis, set of three same as \o. 21oC2, in mahogany box with 
 lid 4.00 
 
 Balance Weights. Assay Ton. Accurately adjusted to the standard of 29.166 grams to the ton. Set 
 from 4 A. T. to -jV A. T 6.00 
 
 WEIGHTS OF MEDIUM ACCURACY 
 
 Balance Weights, of medium accuracy. Gram pieces are nickel plated, fractionals of aluminum, in 
 
 polished box, with forceps. .A very reliable set for ordinary laboratorv routine. 
 
 .Sets. 1 milligram to grams 20 nO 100 200 500 _ 1000 
 
 Per set 2.50 3.25 3.75 .5.00 6.75 9.50 
 
 Balance Weights, of medium accuracy, of lacquered brass. A very useful set for laboratory work. 
 
 Fractionals are of German silver. In polished case with lid and forceps. 
 
 Sets, 100 milligrams to grams 20 50 100 200 .500 1000 
 
 Per set 1.25 1.50 2.00 
 
 Balance Weights, of medium accuracy, Troemner make. In cherry blocl^ 
 
 small pieces of nickel. A very reliable and popular set. 
 
 Sets, 1 centigram to grams 20 _ 50 100 
 
 Per set 1.10 1.25 1.75 
 
 Balance Weights, of medium accuracy, in polished block, without lid. 
 
 forceps. 
 
 Sets, 1 gram to grams _50_ 100_ 200 
 
 Per set 90 1.25 1.80 
 
 3.00 4.25 6.50 
 
 "ughts all solid brass with 
 
 200 
 
 500 
 
 1000 
 
 2.50 4.00 6.50 
 
 and without fractionals or 
 
 500_ 
 3.50 
 
 JOOO 
 5.00 
 
ARTHUR H . 
 
 THOMAS COMPANY 
 
 21668. 
 21672. 
 
 21684. 
 21688. 
 21692. 
 
 Balance Weights, of bras.s in walnut box. These weights are roughly finished and are of ordinary 
 accuracy but are very suitable for students' work. 
 
 Sets, 10 milligrams to grams _ 50 100 200 50Q 1000 
 
 Per set 90 1.25 1.80 3.00 4.75 
 
 Balance Weights, single fractional sizes only of aluminum. Same quality as weights in sets No. 21644. 
 
 Size, milligrams 1_ 2 _ 5 10^ 2 50 100 200 500 
 
 Each 10 .10 .10 .15 .18 .18 .18 .18" Ts 
 
 Balance Weights, of aluminum, fractionals only. Same quality as No. 21644 but in set of from 1 milli- 
 gram to .5 gram. In mahogany box, with forceps 1.50 
 
 Balance Weights, single fractional sizes only, of aluminum, same quality as No. 21648. 
 
 Hize, milligrams 1 2 5 10 20 .50 100 200 500 
 
 Each 
 
 05 .05 
 
 Balance Weights, of iron, for coarse weighing. 
 
 yets, 10 grams to kilos i 
 
 Per set 
 
 Balance Weights, Avoirdupois, of sealed iron, for coarse weighing 
 
 Sets, 2- oz. to lbs I 
 
 Per set 
 
 Balance Weights, Avoirdupois. Troemner make, of nickel s 
 
 ,05 
 
 .05 
 
 .05 
 
 .05 
 
 .05 
 
 ,05 
 
 1.25 
 
 .50 
 
 _10_ 
 5.00 
 
 .85 
 
 1.25 2.25 
 
 Set from i oz. to .jis oz 1.00 
 
 concave, of aluminum. Set from § grain to 10 grains .40 
 Balance Cover, of rubber sheeting, to order to fit balances as per size which must be given with order 
 Aliording a very convement and satisfactory protection to the balances in the laboratory, , 3.00 
 Balance Riders, of aluminum, carefully adjusted. 
 
 Size, milligrams ^1 2 5 6 10 
 
 Each '' 
 
 12 
 
 .15 
 
 .15 
 
 10 
 
 12 
 
 .50 
 
 which they are to be used and 
 
 15 .15 .15 
 
 Balance Riders, same as No. 21696 but of platinum. 
 
 .Size, milligrams 
 
 Each 
 
 Note. In ordering Riders kindly specify make and type of Balance 
 
 they will be sent of proper shape to fit beam without bending. 
 Balance Pans, of glass, with handle. 
 
 Diameter, inches 9l ,>.i ^ 
 
 ■""P"' .75" .75 "" .75 
 
 Balance Reading Glass. A lens with cylindrical curves instead of spherical permitting the reading 
 
 ol the eritire scale of any ordmary analytical balance, with both eyes. On heavy base with 
 
 adjustable joint and extra handle so that same may be usedasahand glass when necessary. 4.50 
 
 Balance Rests, of glass, for use under the levelling screws of balances. Each 10 
 
ARTHUR H. 
 
 T H O MAS COMPANY 
 
 b 
 
 21716. Balloons, of c-ollodion for collecting hydrogen and other g;ises. 
 
 Length, inches 6 12 16 
 
 Each 50 .85~ 1.10 
 
 21720. Barometer, Bunsen's, tube only, graduated in millimeters 3.00 
 
 21724. " " Same as No. 21720 but filled with mercury 10.00 
 
 21728. " Observatory, II. S. Weather Bureau pattern. Furnished with scale divided either to -'^ inch 
 and vernier reading to j^g inch or graduated in millimeters and reading by vernier to 4a ™™- 
 Mounted on polished mahogany board with white glass background to facilitate accurate read- 
 ing. With thermometer 37.50 
 
 21732. Barometer, same as No. 21728but without mahogany board 32.00 
 
 21736. " " " " " " with both millimeter and inch scales. On mahogany board 42.50 
 
 21740. " " " " " " " " " " " " Without mahogany board . 37.00 
 
 21744. Barometer Tube, bent, with bulb, closed at one end 40 
 
 21748. " " straight, closed at one end 35 
 
 21752. Barometer, Aneroid, with open porcelain dial showing internal arrangement, 5 inches in diameter in 
 
 brass case 8.00 
 
 21756. Barometer, Aneroid, watch form for the pocket, 2^ inches in diameter, in gilded metal mounting and 
 morocco carrying case. Compensated for temperature and with revolving altitude scale read- 
 ing to 8000 ft 20.50 
 
 21760. Barometer, same as No. 21756 but with revolving altitude scale reading to 16,000 ft 24.00 
 
 21764. Barometer, Richard, Recording. Divisions of chart equal 1 mm of mercury. Each chart equals seven 
 days of time. In metal and glass case, 18 x 12 x 11 cm. 
 
 Duty Free 22.00 Stock 36.00 
 
 Charts, for use with above. 
 
 Duty Free, per 100 2.50 Stock 3.25 
 
 21768. Battery, Edison Primary. These batteries, formerly known as Edison-Laland, are unequalled for 
 closed circuit work. They have a mean working E. M. F. of .667 volts per cell. When working 
 continuously it is not advisable to take over 1^ amperes from the "BB" type, 2^ amperes from 
 the "Q" type and 6 amperes from the "S" type. 
 
 Type "BB" "Q" "S" 
 
 Size, inches 4^x71 5^ x 8^ Sf x 13 ■ 
 
 Capacity, ampere hours 100 150 300 
 
 Complete in porcelain jar 1.50 2.20 3.00 
 
 Complete renewal 72 .82 1.4G 
 
 The following is the itemized cost of the parts necessary for one charge in renewing the batteries. 
 
 Copper Oxide Plates 24 .31 .62 
 
 Zinc Plates 28 .28 .50 
 
 Caustic Soda .15 .17 .28 
 
 Paraffine Oil 05 .06 .06 
 
■84. Type ES. 
 
 21772. Battery, Grenet, uri{ri[i;il rjfnch make. 
 
 Capacity, liters 2 1 J^ 
 
 Complete 2.00 2.75 4.00 
 
 Carbon, for renewal .50 .80 .90 
 
 Zinc " " 20 .25 .30 
 
 2177(>. Battery, Dry, an open circuit battery of high efficiency, 7 x 2^ inches 25 
 
 21780. Batlery, Storage, Model of the Physikalisch-Technische Reichsanstalt, Type U. These cells are 
 52 X 30 X 80 mm high, with Sealed in porcelain lid and arrangement to permit the outlet of gases 
 through fine glass wool. The cells have an E. M. F. o£ 2 volts each and have a capacity of .8 
 ampere hours at the normal discharge rate of j^ ampere, or 2 ampere hours at a discharge rate 
 of -[-Ju ampere. They are widely used for physical measurements, the testing of ammeters, volt- 
 meters and other electrical measuring instruments, and have been found useful in many kinds 
 of laboratory work where a great variation in E. M. F. is required. The cells are furnished singly 
 for mounting in the laboratory or mounted up on base boards with connections, in batteries 
 of from 10 to 100 cells; in portable cases, with switch board and Hd, in batteries of 20 to 100 cells; 
 and in portable cabinets in batteries of from 120 to 400 cells. Prices on application. 
 
 21784. Battery, "Chloride Accumulator," Portable Type. Portable batteries are shipped filled with electrolyte 
 and charged ready for service. While the greatest care is used in packing, it is almost impossible to 
 avoid damage to cells of this type shipped by freight. For short distances it is, therefore, recom- 
 mended that shipment of the portable type be made by express. Where distance is great it is 
 recommended that electrolyte be forwarded separately as in the case of regular batteries. Each cell 
 when discharging gives approximately 2 volts and, as the cells in each case are connected in series, 
 the number of cells multiplied by 2 will give the approximate voltage between the two outside con- 
 nectors of each ease. The normal charge rate is the highest rate in amperes at which the battery 
 should be charged. At this rate a battery will be fully charged in nine hours and discharged in 
 eight hours. 
 
 03 
 
 C3 
 
 C3 
 
 03 
 
 14 
 
 ij 
 
 26 
 
 35 
 
 9.00 
 
 12.50 
 
 16.00 
 
 19.00 
 
 D3 D3 
 
 4 
 D3 
 
 D3 
 
 D.5 
 
 2; 21 2J 2;- 25 5 
 
 1.5 26 37 48 ^9 24 
 6.50 12.00 16.50 21.0025.00 10.00 
 
 4 
 D7 
 
 Number of cells in case .... 1 
 
 Type and No. of plates 03 
 
 Normal charge rate, amp. . . Ij 
 
 Weight, pounds 8 
 
 Price, complete charged 5.00 
 
 Number of cells in case 2 
 
 Type and No. of plates Do Do Do Do D7 1)7 D7 D7 D7 E5 
 
 Normal charge rate, amp 5 5 5 5 71- 7-2 7^ 7'. 7^ 10 
 
 Weight, pounds 43 62 81 100 .33 J5S S3 108 133 33i 
 
 Price, complete charged 18.00 26.00 .32.00 38.00 12.00 22.00 30.00 40.00 50.00 14.50 
 
 Number of cells in ca.se 2 3 4 5 1 2 3 4 1 1 
 
 Type and No. of plates E5 E5 K5 E5 E7 E7 E7 E7 E9 Ell 
 
 Normal charge rate, amp 10 10 10 10 15 15 15 15 20 25 
 
 Weight, pounds 60 86 j 113; 140 42i 82^ 12 2j 1 63 4 4| 53j 
 
 Price, ( 
 
 complete charged. . 
 
 28.00 40.00 50.00 60.00 18.00 35.00 50.00 60.00 21.00 25.00 
 
ARTHUR H. THOMAS COMPANY 
 
 I7S8. Type D; 
 
 Type C3 
 
 Type PI 1 
 
 Battery,"ChIoride Accumulator," the most widely used form of storage battery. The voltage of cells of all 
 (.-apacities is slightly over 2 volts on open circuit and, during discharge at the 8 hour rate, varies 
 from that point at the beginning to 1.75 volts at the end. Electrolyte is shipped in carboys, for 
 each of which a charge of $2.00 net is made and an extra charge of 5c for caps when required. Credit 
 will be allowed in full for these carboys when returned in good condition and charges prepaid. The 
 following net charges are made for casing and packing. 
 
 "B," "LT" and "BT" elements, each 02 
 
 "C" and "CT" elements, each .04 
 
 "D" "PT" and "ET" elements, each 10 
 
 "E" elements, each .15 
 
 "F" elements, each 25 
 
 Rubber Jars, each 05 
 
 No charge for packing Glass Jars. 
 
 Type LT BT CT PT ET B C D 
 
 Size of plate, inches 31x1 4^3 jxj 
 
 Number of plates 2 2 2 
 
 Discharge m J - „ f * ^- 
 
 amperes for. . . I o » ' ' * ii o 
 
 Normal charge rate ^^ f H 
 
 Price, element only .60 .90 1.75 
 
 Price, glass jar only 20 .25 .50 
 
 Price, glass cover only ,12 .14 
 
 Price, rubber jar and cover. .65 1.10 
 
 Type I 
 
 Size of plates, inches Gx 
 
 Number of Plates ', 
 
 Discharge in J ? ^'^J^''^ 
 amperes for. . . 1 q k 
 
 Normal charge rate 71 10 
 
 Price of element only ^75 8.50 
 
 Price of glass jar, only 1.35 1.70 
 
 Type 
 
 Size of plates, inches. . . 
 
 Number of plates 
 
 [ 8 hours. 
 Discharge in j 5 " 
 amperes for j 3 
 
 3.50 
 .95 
 
 2.25 
 .30 
 
 .95 
 
 3.50 
 .35 
 
 5.00 
 .45 
 
 3.25 5.00 
 .85 1.00 
 
 1.40 1.45 1.70 
 
 lOi 
 
 6x6 6x6 6x6 
 
 17} 
 25 
 
 10.25 12.00 
 1.70 2.55 
 
 8.25 11.75 
 1.50 1.70 
 
 20 
 2S 
 
 15.25 
 
 1.85 
 
 15 
 35 
 
 18.75 
 2.05 
 
 : nx7i 
 
 13 
 30 
 42 
 
 60 70 
 
 30 35^ 
 
 "22.25 25.75 
 
 2.90 3.40 
 
 Normal ch 
 
 ( 1 
 
 ! rate. . 
 
 11 
 
 50 
 70 
 100 
 200 
 50 
 
 13 
 60 
 84 
 120 
 240 
 
 iixio; 
 
 15 
 
 70 
 
 98 
 140 
 280 
 
 70 
 
 1x10! ll.doi 
 17 19 
 
 80 
 
 112 
 160 
 320 
 
 126 
 180 
 360 
 90 
 
 Price of element only. . . 30.00 37.50 45.00 52.50 60.00 67.50 
 Price ofglass jar A only. 4.40 5.05 5.05 6.25 
 
 100 
 140 
 200 
 400 
 100 
 75.00 
 
 220 
 440 
 110 
 
 240 
 480 
 
 130 
 182 
 260 
 520 
 130 
 
 52.50 90.00 97.50 
 
ARTHUR H THOMAS COMPANY 
 
 2I82S. 
 2IS32. 
 21S.W. 
 
 No 
 21792. 
 
 21796. 
 
 21SU No n J .No. 21824 
 
 Battery Binding Posts, of brass. Style 
 
 Each 
 
 Battery Connectors. Style 
 
 Each 
 
 Battery Jars, cylindrical, white glass, hand 
 
 Diameter, inches 4 
 
 Height, inches 4 
 
 Number in original package 60 
 
 Each 20 
 
 Per dozen, in original 
 package 1.45 
 
 Battery Jars, square form, with ground top 
 
 No. 21S28 
 
 made. 
 
 4i 
 
 4 J 
 
 4S 
 
 .25 
 
 1.65 
 
 These ar 
 
 No 
 
 A 
 .10 
 
 4 
 
 4S 
 
 1.80 
 
 2 packed .? 
 
 218,12 
 B 
 .07 
 A 
 
 No 
 
 c 
 
 .10 
 
 B 
 
 21808-21812 
 D 
 .20 
 
 C 
 
 E 
 .25 
 D 
 
 21800. 
 21804. 
 
 .35 
 
 7 
 30 
 .50 
 
 X dozen 
 
 ^ 
 5 
 .20 
 1.05 
 120 
 ..30 
 250 
 .75 
 
 .25 
 
 6 
 
 S 
 24 
 .65 " 
 
 3.30 
 
 in a case. 
 
 4 
 
 4 
 
 •S 
 
 .30 
 
 1.30 
 
 250 
 
 .70 
 
 500 
 
 .90 
 
 .25 
 
 9 
 
 12 
 
 s 
 
 1.50 
 S.25 
 
 u 
 
 6 
 
 1.40 
 500 
 1.00 
 1000 
 1.20 
 
 .20 
 
 9 
 
 15 
 
 6 
 
 1.90 
 
 9.63 
 
 
 Width, inches 
 
 
 
 4 
 
 
 Each 
 
 
 
 
 
 
 
 
 1.05 
 1000 
 1.40 
 2000 
 3.00 
 
 21808. 
 
 Beakers, Aluminum, with spout. Capacity 
 
 "<; 
 
 00 
 ..50 
 125 
 .55 
 
 21812. 
 
 Beakers, Copper, with spout. Capacity, cc. 
 Each 
 
 
 
 
 Beakers. Enamel Ware, of seamless steel, white enamelled, both acid and fire proof. Very convenient 
 for many purposes in the laboratory and especially for culture tubes during incubation. 
 
 Capacity, cc 300 450 650 900 
 
 Height, mm 90 100 110 120 
 
 Diameter, mm ^5^ ^ So 95 100 
 
 Each 3Q 35 ' 1^5 ^ 
 
 Beaker, Enamel Ware, of seamless steel, white enfimelled, both acid and fire proof, with flat well 
 '''■■' '" nm high by 70 mm inside diameter. Made especially for and widely used in 
 
 ■. . Capacity 500 cc 50 
 
 I'orcelain, glazed inside and outside, without spout. Widely used in the 
 \<, etc. 
 -340 5S0 SOO 
 
 exten.lf 
 thr ,! , 
 Beakers, i; > 
 
 Capaci 
 Each.. 
 
 970 
 l.56~ 
 
 1500 
 
 „ , 90 1.08 1.35 
 
 Beakers, Sanitats" Porcelain, glazed inside and outside, with spout, 
 
 Capacity, cr 325 .500 1000 
 
 Each _5Q -jg J 25 
 
 Beaker, Royal Berlin Porcelain fDye Pot), glazed on the inside entirely and on the outside down 'to 
 the heavy ring for supporting same in water bath. Below the ring the beaker is unglazed; with- 
 out lid; 165 mm high, 132 mm diameter at top, capacity 1460 cc " -i 70 
 
 Lid, Royal Berlin Porcelain, for above beaker "'5O 
 
ARTHUR H . THOMAS C ("j [v] P A N Y 
 
 NOTE~0ur "Best Bohemian" beakers Nos. 21S40, 21844, 21860, 21864 and 21S68 are offered aa bemg 
 the highest product of the Bohemian factories. They are selected after the most exhaustive 
 chemicaland physical tests made in Philadelphia under our own direction and are distinctly 
 superior in shape, finish and resistance properties to German made beakers, with the exception 
 of the products of Schott & Gen at Jena. We do not list or stook German beakers but can 
 supply them on duty free orders at somewhat less price than our "Best Bohemian." 
 
 218411. Beakers. Best Bohemian Glass, Griffin's low form, with spout. This is our standard beaker and widely 
 used in both educational and industrial laboratories. They are selected with special care as 
 to shape and quality and are recommended as a most satisfactory beaker for routine work. 
 
 Number 000 00 l" 2 3 4 
 
 Capacity, cc 20 40 100 1.50 2.50 350 500 
 
 Each ^7 J)8 AO .12 .15 .20 .25 
 
 Number 5 7 s 10 U 12 
 
 Capacity, cc 670 950 12.50 IT.'ill 2H)0 ^lOiH) :}750 4.500 
 
 Each ; ~..35 .4.5 ' .5-5 .70 ..SO .95 1.10 1.30 
 
 2184-1. Heakers, Best Bohemian Glass, Griffin's low foi-in, williuul i-pout. tlthcrwise same as aliove. 
 
 Number OOi) (in (112 3 4 
 
 Capacity, cc 20 40 l("i 1.5(1 2^0 :i50 .500 
 
 Each ~07 .08 .10 .12 .1.5 .20 .25 
 
 Number 5 6 7 s ^i 10 11 12 
 
 Capacity, cc 070 9.5(1 12.50 17.50 2400 30(10 37.50 4500 
 
 Each .35 .45 ..55 .70 ^80 M 1.10 1.30 
 
 2184?>. Beakers, New Jena Glass. Griffin's low form, with spnut. The standard 
 throughout the civilized world. 
 
 Capacity, cc ,50 100 150 
 
 Each .12 .13 .1-5 
 
 Capacity, cc SOO loOli 1300 1,500 
 
 Each 34 .39 .47 .53 
 
 ;aker for analytical work 
 2.50 400 
 
 2(J00 
 .60 
 
 2500 
 .68 
 
 _ ^2? 
 .29 
 
 3000 
 .78 
 
 218.52. Iteakers, Whitall Tatum Nonsol Glass, Griffin's low form, with spout. Extremely resistant to tempera- 
 tuic change. Very insoluble in water, acids and alkalies and especially recommended for their 
 uniformity of shape. By special arrangement we offer these Beakers for immediate shipment 
 from our own stock at manufacturer's original net prices. 
 
 Capacity, cc 30 60 _ 00 _ _ 120 _ 150 ISO 
 
 Each 12 .12 " .13 .i4 .15 .15 
 
 Capacity, cc _2.50 300 3.50 .500 iiOO 700 1000 
 
 Each 17 " .18 .20 .25 .28 .30 .45 
 
 21851). Beakers, Whitall Tatum Regular Glass, Griffin's low form with spout; widely Ut-ed in industrial labora- 
 tories because of their uniform shape and high quality of the glass. Exactly similar in shape to 
 No. 21.S52. By special arrangement we offer these Beakers for immediate shipment from our 
 stock at manufacturers original net factory prices. 
 
 Capacity, cc 30 " 60 00 120 150 l.sO 250 300 
 
 Each .09 .09 .10 .11 .11 .12 .12 .14 
 
 Capacity, cc 350 5(10 GOO 700 1000_ 1400 2000 
 
 Each 16 .19 .20 .23 .35 .43 .55 
 
ARTHUR H. THOMAS COMPANY 
 
 Beakers, Best Bohemian Glass, usual or B 
 Number 000 
 
 Capacity, 
 
 Each 
 
 Number, . 
 Capacity, 
 Each 
 
 j form, witiiout spout, 
 1 
 
 Same quality as No. 21840. 
 
 5 
 380 
 .22 
 
 Beakers, Best Bohemian Glass, usu. 
 
 Number 
 
 Capacity, cc 
 
 Each 
 
 Number 5 
 
 Capacity, cc 380 
 
 Each ;^22 
 
 15 
 
 30 45 
 
 75 
 
 110 
 
 170 250 
 
 .06 
 
 6 
 580 
 
 .07 .08 
 
 7 S 
 800 1150 1 
 
 .10 
 
 9 
 750 
 
 .12 
 
 10 
 2250 
 
 .15 .18 
 
 11 12 
 
 2800 3700 
 
 .28 
 
 jal or Ber 
 
 000 
 
 15 
 
 .35 .40 
 
 zelius form, with spout 
 00 
 30 45 
 
 .55 
 
 Same 
 1 
 75 
 
 .65 
 
 quality 
 
 110 
 
 .75 .90 
 
 as No. 21840. 
 
 3 4 
 170 250 
 
 .06 
 
 .07 .08 
 
 .10 
 
 .12 
 
 .15 .18 
 
 _80fl 
 .35 
 
 9 
 1750 
 
 10 
 2250 
 
 .40 
 
 .55 
 
 21868. Beakers, Best Bohemian Glass, extra tall form, without spout. Convenient for lecture table. 
 
 t'ap: 
 Each 
 
 350 
 
 .15 
 
 Beakers, New Jena Glass, usual or Berzelius form. 
 
 Capacity, cc 50 100 150 
 
 Each 12^ 
 
 Capacity, cc 800 
 
 Each .32 
 
 5 00 750 
 
 .30 .35 
 
 without spout. 
 
 1S00_ 
 ^50 
 
 jMOO 
 .60 
 
 200 
 
 .13 
 
 lOOO 
 
 .37 
 
 or Berzelius ft 
 
 1300 
 
 21876. Beakers, New Jena Glass, u: 
 
 Capacity, cc ; 
 
 Each 12 .13 .15 
 
 Capacity, cc .800 1000 1300 
 
 Each 32 .37" .42 
 
 21880. Beakers, Whitall Tatum Nonsol Glass, u.sual for 
 change. Very insoluble in water, aciil.< .'n 
 formity of shape. By special arrautrciiicn 
 our own stock at manufacturer's original 
 
 Capacity, cc " 111] 
 
 Each 12 
 
 21884. Beakers. Whitall Tatum Regular Glass, tall fo 
 
 .17 
 
 1500 
 
 spout. 
 200 
 
 300 
 
 .21 
 
 _2000 
 
 .53 
 
 2000 
 ' .53 
 
 400 
 
 500 
 
 600 
 
 .24 
 
 2500 
 
 .26 
 
 3000 
 
 .29 
 
 4000 
 
 .63 
 
 .73 
 
 .85 
 
 _400 
 .24 
 
 2500 
 
 3000 
 .73 
 
 .29 
 
 4000 
 .85 
 
 with spout. E.xtrcraely resistant to temperature 
 
 tikalics and especially recommended for their uni- 
 
 ■ olT<.r these Beakers for immediate shipment from 
 
 liriccs. 
 
 Kl 120 180 250 300 350 500 700 1000 
 
 .13 .14 
 
 .15 
 
 .17 
 
 .18 .20 
 
 .30 .45 
 
 . = -, — - "ith spout. Extremely resistant to temperature 
 
 changes. Very insoluble m water, acids and alkalies and especially recommended for their 
 uniformity of shape. By special arr.angement we offer these beakers for immediate shipment 
 from our own stock at manufacturer's original net prices 
 
 Capacity, cc 30 
 
 Each.. 
 
 Capacity, cc 
 
 Each 
 
 60 
 
 90 
 
 120 
 
 180 
 
 250 
 
 .09 
 
 300 
 
 .09 
 
 350 
 .16 
 
 .10 
 
 600 
 
 .11 
 
 700 
 
 .12 
 
 1000 
 
 .13 
 
 1200 
 
 
 .19 
 
 .23 
 
 .35 
 
 .38 
 
No. 218S8 Nn. 2IJ(!I2 No 9 N No. 21912 
 
 21888. Beakers, New Jena Glass, alcndLM- coiiiual form, with spout. 
 
 Capacity, cc 50 100 150 250 500_ 750 1000 
 
 Each 12 .13 .15" .17" .26 .34 .38 
 
 21892. Beakers, New Jena Glass, wide conical form, without spout. 
 
 Capacity, cc 50 100 150 250 _ JOO _ 750 1000 
 
 Each .12 .13 .15 .17 .26 .34 .38 
 
 21896. Beakers. Phillips, conical shape, without spout. 
 
 Capacity, cc 100_ _ 250 500 750 10 00 
 
 Each .10 .15 .25 -30 .40 
 
 21900. Beakers, Phillips, conical shape, with spout. 
 
 Capacity, cc 100_ _250 ^500 750_ 1000 
 
 Each .IS .22 .3Q ' .35 .45 
 
 21904. Beakers, tmnblor form, of heavy molded glass. Not intended to stand heat; capacity 7 oz 10 
 
 21908. Beakers, Heavy Glass, low wide form with spout, convenient for many purposes for which the ordi- 
 nary thin boiling beaker is not suitable. 
 
 Capacity, cc 100 250 400 750 1000 2000 
 
 Each 20 .24 .35 .50 .60 .85 
 
 21912. Beaker. Heavy Glass, with wide flaring lip and spout, as used in sugar analysis. 
 
 Capacity, cc 175 900 
 
 Each 20 .40 
 
 cumeiucnt foi 
 
 o\crin„ tniall objects. 
 3 
 
 Bell Glass, of light Llo^n |^Lis=, Mitfiout fljngi 
 
 Diameter, inches 
 
 Height, inches 
 
 Each 35 
 
 Bell Glass, of heavy glass, with extra wide flange carefully ground for use as air pump receivers 
 
 Height, mm SO 
 
 Diameter, mm 80 
 
 Each .6"0 
 
 Bell Glass, low form, with ground flange 
 
 Height, inches 
 
 Diameter, inches 
 
 Each 
 
 Bell Glass, low form, without flange. A very convenient shape for cove 
 
 Height, mm 100 
 
 Diameter, mm 200 
 
 Each " .60~ 
 
 Bell Glass, with open top, with tubulature near bottom and with wide, w^ell ground flange. Suitable 
 
 for use as an air pump plate. 
 
 Height, mm 300 300 
 
 Diameter, mm J^50 __ 200 
 
 Each "3700 TOO 
 
 105 
 105 
 
 130 
 130 
 
 
 180 
 155 
 
 200 
 175 
 
 220 
 220 
 
 
 260 
 260 
 
 .75 
 
 I' f 
 
 1.10 
 
 35 
 5 
 
 4 
 
 1.60 
 
 2.00 
 
 5 6 
 8 9 
 
 2.50 
 
 8 
 10 
 
 10 
 
 12 
 
 3.00 
 
 11 
 16 
 
 .50 .60 
 
 .75 
 
 l.Oll 
 
 1.25 
 
 1.50 1.75 
 
 2.00 
 
 3.50 
 
 6.00 
 
 120 
 240 
 
 150 
 300 
 
 180 
 400 
 
 1.50 
 
 2.25 
 
 4.00 
 
i 
 •, 
 
 -j^. 
 
 1.00 1.00 1.25 1.50 1.75 1,75 2.00 
 
 top : suitable for covering miorosropes, etc. ; 
 
 IS 
 
 IS 
 
 Si 
 
 10 
 
 2.50 
 
 .■i.OO 
 
 flange not 
 
 
 2(1 
 
 
 11 
 
 
 S.50 
 
 Bell Glass, high form, with ground flange 
 
 Height, inches S 11 14 15 l.i 15 
 
 Diameter, inches 4 5 Gi- 7 S 85 
 
 Each ~~M -J 
 
 Bell Glass, high form, with more or less squa 
 ground. 
 
 Height, inches lo 15 
 
 Diameter, inches S 9 
 
 Each... , 2.40 3^50" 
 
 Bell Glass, with open top, with ground flange and without stopper. 
 
 Height, inches 6 S 9 11 15 
 
 Diameter, inches 3 4 5 6j 7 
 
 Each [70 M~ 1.00 1.20 iTso" 
 
 Bell Glass, with open top, same as Xo. 21944 hut with ground in glass stopper. 
 
 Height, inches 6 S " 9 11 15 
 
 Diameter, inches ,, 3 4 5 6 T 
 
 Each .75 l.IO 1.20 1.50 2.00 
 
 Bell Glass, double walled, with ground-in glass stopper. The jar may be filled with colored fluid act 
 ing as a ray filter for determining the etTect of various ravs on plant functions, etc. 
 
 Height, mm 300 400 
 
 Diameter, mm 120 150 
 
 Each (i.nn 7. no 
 
 6.00 
 
 S.50 
 
 13 
 
 IS 
 10 
 
 2..50 
 
 6.00 
 
 15 
 
 IS 
 10 
 
 3.00 
 
 6.50 
 
 21956. Binoculars, Bausch & Lomb-Zeiss Stereo, for nature study, ornithology, etc. The 6 X, 20 mm objec- 
 tive glass is recommended as a general purpose glass and for tourists' and sportmen's use the 
 8 X, 21 mm glass, is recommended. Price includes heavv leather carrying case 
 
 Power 6X 6X ' SX 8X 12 X 10 X 
 
 Diameter 01 objectives, mm 21 30 21 25 30 45 
 
 Each 40^ 60.00 40^00 50:00 70.00 75.00 
 
ARTHUR H. 
 
 T H (J M AS C: O M P A N Y 
 
 No. 2BS4 Bli 
 
 21960. Bladders, Animal, dried assorted sized. Per dozen l.OO 
 
 21964. Blower, High Pressure, a new patent precision blower absolutely noiseless in operation and highly 
 recommended for laboratory use. Very superior in steadiness of pressure and power required 
 to the ordinary blower operating on the ventilating fan principle. Size A gives ij kilos, 
 requires i^:. h. p. motor and should be driven at 1400 r. p. m. Size B requires i h. p. and gives 
 S kilos and should be driven at 700 r. p. m. S'v/.q A will operate simultaneously three labora- 
 tory blast lamps and Size B will operate six. 
 
 Size A _B 
 
 Duty Free 18.00 "SiToo" 
 
 Duty Paid 21.60 36.00 
 
 21968. Blowers, Foot Power. These blowers produce a powerful and continuous blast, the pressure of which 
 may be increased by adding one or more rubber discs to the air reservoir. 
 
 Diameter of air reservoir, inches 7\ 9 11 
 
 Each Xon " 7^00 11.50 
 
 21972. Blowers, Foot Power, same as No. 21968 but mounted on legs. 
 
 Diameter of air reservoir, inches 7| 9 11 
 
 Each eTOO 8.00" 12.50 
 
 21976. Rubber Discs for above Foot Blowers. These discs are cut from steam cured sheet rubber which is made 
 of the best Up-River Para and contains no other ingredients than the necessary sulphur for 
 curing. Will last much longer than discs cut from ordinary rubber sheeting. 
 
 Diameter, inches 7^ 9 11 
 
 Each TeO ^0 1^25 
 
 21980. Nets for above Foot Blowers. Each 35 
 
 21984. Blower, Crowell's Positive Pressure. Will give blast of from 1 to 10 lbs. pressure to the square inch 
 or may be used as a vacuum pump for exhausting of vacuum not exeeding 24 inches of mercury. 
 This apparatus is most satisfactory in securing suction for laboratory filtrations, etc. There are 
 no springs, gears, valves or unbalanced parts and the pump does not have to be reversed when 
 changing from blast to suction. In ordering please state whether or not air reservoir is desired. 
 
 1 
 
 
 ■Sis- 
 PI 
 
 111 
 
 ilili 
 
 i 
 
 si 
 
 2;£ 
 
 ,aS.. 
 
 Ill 
 
 i« 
 
 
 
 1-A 
 
 20 
 
 6,9 
 
 600 
 
 ■ 
 
 4x1 
 
 24 
 
 lin. 
 
 10 s 6i 
 
 $20.00 
 
 8.00 
 
 2-.4 
 
 45 
 
 13. 
 
 500 
 
 i 
 
 4x H 
 
 34 
 
 
 12^ X o; 
 
 26.00 
 
 8.00 
 
 3-A 
 
 125 
 
 25.3 
 
 350 
 
 i 
 
 6x2i 
 
 90 
 
 1 " 
 
 22 X 14 
 
 40.00 
 
 10.00 
 
 4-A 
 
 280 
 
 40,5 
 
 2,50 
 
 1 
 
 9x3 
 
 170 
 
 n " 
 
 2S Xl7 
 
 .50.00 
 
 10.00 
 
 5-A 
 
 460 
 
 53,2 
 
 200 
 
 u 
 
 10x3 
 
 Q05 
 
 2 " 
 
 34 X 20 
 
 75.00 
 
 18.00 
 
 6-A 
 
 690 
 
 79,8 
 
 200 
 
 " 
 
 12x4 
 
 320 
 
 2 " 
 
 38 x20 
 
 100.00 
 
 18.00 
 
21996. 
 22000. 
 22004. 
 22008. 
 22012. 
 22016. 
 
 22020. 
 
 22022. 
 22023. 
 
 with bulb. 
 
 Blowpipe, of brass. 
 
 Length, mm 
 
 Each 
 
 Blowpipe, of brass, 
 
 Length, mm 
 
 Each - . . 
 
 Blowpipe, Black, of japanned tin, with removable brass tip , . . , . 
 
 " " of brass, with screwed on tip, and wooden mouth-piece, . 
 
 Mouth-piece for Blowpipes, of hard rubber, new form 
 
 " " wood ,■ 
 
 Blowpipe, Plattner, with hard rubber mouth-piece but without platinum tip. . 
 
 ni„t: t:„.- i,,..- „u ,1,1. ... c rn„.-t dI ; — 7i'^ ■JOOIO of ..i.io(io rlai-im 
 
 200_ 
 .08 
 
 .17 
 
 250 
 .20" 
 
 .15 
 .50 
 .40 
 .10 
 
 . . . 1.50 
 
 Platinum Tips, detachable, to fit Plattner Blowpipe No. 22012 at prices depending upon the platinum 
 
 market. 
 Blowpipe, Berzelius form, of brass, extra fine finish, with hard rubber mouth-piece and platinum plate 
 
 placed on eiir! of jet. A very satisfactory form 2.00 
 
 Blowpipe, Charcoal, Ariiorican, willow, of fine uniform grain, 4 x 1 x § inches. Per dozen 50 
 
 nf ioar>!cr srain than above, 4) x. IJ- x :1 iufhe?^. Per dozen 25 
 
 No. 22024 
 
 Blowpipe Set of Apparatus and Reagents, as designed by Prof. Butler of the Colorado School of Mines 
 for use in the laboratory and in the field. Each piece is so arranged as to prevent any break- 
 af^e; outside dimensions 11^ x 6j x 2i inches. Complete including wet and dry fluxes and 
 
 alcohol and oil in lamps 17.50 
 
 The outfit consists of the following:— 
 
 Blowpipe 
 
 PiBlinum Wires and Haider 
 
 Combination Charcoal Boror. 
 
 Magnet and Chisel 
 Streak Plate 
 Blue Litmua 
 Red Lilmu 
 
 c Tubes 
 
 2 slicks Charcoal 
 6 open Tubes 
 Large Test Tube 
 Smnli " " 
 
 Hydrate 
 
 Cobalt Nitrate 
 Hydrochloric .^ 
 Sulphuric Aci< 
 
 22028. Pocket Handbi>[(k of Blowpipe Analysis, by G. Montague Butler, E. M.. 
 
 Bismuth Flux 
 
 Borax 
 
 Potassium Bisulphate 
 
 Oil, Lamp, brass 
 
 Alcohol Lamp, brass 
 
 Hammer 
 
 Platinum Tipped Forceps 
 
22032. Boiler, (ir saucepan, of best imported enamel ware, white on inside and blue on outside. These goods 
 are made of seamless steel and the enamel is both acid and fire proof and distinctly superior 
 to the ware usually sold for household purposes. Very convenient for use in the preparation 
 of culture media, etc. With cover. 
 
 Size, inches G, x 4 8 x 5i 
 
 Capacity, quarts 2 4| 
 
 Each .90 1.30" 
 
 22036, Boiler, or saucepan, same quality as No. 22032. Without cover. 
 
 Hize, inches , . . . . 5x3 6^x3^ Sj x 5 
 
 Capacity, quarts 1 2_ 4 
 
 Each .35 .50~"" .95 " 
 
 22040. Boiler, or saucepan, double, same quality as No. 22032. Capacities given are for inside boilers. 
 
 Capacity, quarts 1 2 4 
 
 Each JM 2725 Os 
 
 22044. Bolting Cloth, as used in making sieves, of standard mesh, 40 inches in width. 
 
 Mesh per Hnea! i inch 24 27 31 37§ 44 50 
 
 Per yard 2.60 2.80 3.40' 4.15 8.50 " 10.00 
 
 22048. Botanical Adhesive Tape, on spool, for fastening specimens to mounting paper, i inch wide, 36 inches 
 long. Per spool 10 
 
 22052. Botanical Drying Paper, superior quality, as used in the U. S. Department of Agriculture and in other 
 prominent herbaria. This paper, being made of pure cotton stock similar to blotting paper, 
 absorbs the moisture much more readily than the driers usually supplied which contain a certain 
 percentage of wood. 13^ x ISi inches. Per 100 sheets 2.00 
 
 220.56. Botanical, Drying Paper, extra heavy. Per 100 sheets 1..50 
 
 22060. " Genus Covers, extra quality and weight, 17 x 24^ inches, with surface specially prepared for 
 writing upon. Per 100 _ 2.50 
 
 22064. Botanical Mounting Paper. This paper, as well as the Driers and Genus Covers, is made specially 
 for us in very large quantities and we have used in it the purest, strongest stock producing a 
 mount which has that desirable stiffness so seldom found in mounting papers. The color is very 
 white and does not change with age as papers made of impure stock are sure to do. Size llf x 17 
 inches. 
 Per 100 sheets 1.25 Per 500 sheets 5. .50 
 
 22068. Botanical Pressing Paper, best white, folded and trimmed. Per ream 1..50 
 
 22072. " Portable Plant Press. This press is light and strong and may be carried into the field with 
 ease. Elastic bands prevent disarrangement of specimens and unused driers when the press is 
 opened. Furnished with six driers 2.00 
 
 22076. Botanical Vasculum or Collecting Case, of metal, enameled with door opening along entire length. 
 Size 16 x 8 X 5^ inches. With shoulder strap 2.00 
 
 22080. Bottles. Aspirator of heavy white glass, with outlet near bottom. 
 
 Capacity, liters j ^ 1 2 4 6 8 12 20 
 
 Each .40 .50 .70 1.00 1.60 2.00 3.00 4.50 10.00 
 
 22084. Bottles, Aspirator, of heavy white glass, with outlet tube near bottom formed into nipple for attaching 
 rubber tubing. 
 
 Capacity, liters i _ j h _ 1 _ 2 _ 4 6 8 12 
 
 Each 35 .40 .50 .75 1.00 1.75 2.25 3^25 4.75 
 
ARTHUR H. THOMAS COMPANY 
 
 Bottles. Aspirator, aaiiie as No. 22084 but graduated. 
 
 Capacity, liters 1 
 
 Each .90 
 
 Bottles, Aspirator, with ground glass stopper and glass stopcock ground into outlet 
 
 Capacity, liters ^ i 1 2 4 
 
 Each r.60 1.80 2.00 2.50 4.00 
 
 Bottles, Aspirator, of heavy white glass, with ground in glass stopper and glass 
 tubulation and held in place by a metal screw cap. 
 
 Capacity, gallons 1 
 
 Each ^Teo" 
 
 S J^ 
 
 ,00 9.00 
 
 stopcock ground in at 
 
 3 5^ 
 
 10..50 13.35 
 
 s. 
 
 2211(1 
 22120. 
 
 22124. 
 
 22128. 
 
 22132. 
 22136. 
 22140. 
 
 Bottles. Balsam, with glass balsam dropper htting loosely in the neck of the bottle and with glass cap 
 ground on. Capacity 45 cc 25 
 
 Bottle, Balsam, with constricted neck, dropper of wood and ground on cap, 30 cc capacity 50 
 
 Bottle, Balsam, conical form, with turned in lip for removing excess balsam from rod and conical cap 
 to keep rod in vertical position, capacity 50 cc .40 
 
 Bottle, Dropping, with ground in pipette stopper with rubber cap to control delivery from pipette. 
 
 Capacity, oz ^ 1 
 
 Each 25 "^ 
 
 Extra Rubber Caps for No, 22112 Dropping Bottles, per dozen 50 
 
 Bottle, Dropping, with Barnes' pipette stopper. A very convenient and inexpensive bottle. Capacity 
 
 30 cc 10 
 
 Extra Rubber Bulb and pipette only for No. 22120 Bottles 05 
 
 Bottle, Dropping, with ground in pipette. Delivery mav be controlled by finger or by the use of a rubber 
 bulb. 
 
 Capacity, cc 15 30 50 
 
 Each .15 
 
 Bottle, Dropping, same as No. 22128 but with rubber bulb. 
 
 Capacity, cc I5 
 
 Each 19~ 
 
 Bottle, Dropping, same as No. 22128 but of amber glass. 
 
 < Capacity, cc , 
 
 Each 
 
 Bottle, Dropping, same as No. 22136 but with rubber bulb. 
 
 Capacity, cc 
 
 Each 
 
 .18 
 
 .20 
 
 30 
 .22 
 
 50 
 .25 
 
 30 
 
 60 
 
 .25 
 
 .30 
 
 30 
 .30 
 
 50 
 .35 
 
h 
 
 22160. 
 22164. 
 221K8. 
 
 content, ■? drop by drop or to licnnetically 
 15 30 oO 
 
 Bottle Dropping, TK patent with stopper arranged to deli\ 
 seal the bottle. 
 
 Capacity, cc _!.:; 30 oO 100 
 
 Each .15 .18 .20 .30 
 
 Bottle Dropping, same as Xo. L'2144 but with flat stopper ]irotecting the Up of the bottle from dust. 
 
 Capacity, cc 15 30 50 ^00 200 
 
 Each 25 .25 .30 .35 ".40 
 
 Bottle Dropping, same a.s Xo. 2214S but of amber glass. 
 
 Capacity, cc j^ ^ _ 50_ lOU 2W) 
 
 Each 28 .28 ..35 .40 .50 
 
 Bottle Dropping, witli ground in pipette stopper and glas« cap ground nn, ^'e^y suitable for hiehly 
 volatile contents. 
 
 Capacity, cc 30 _60 
 
 Each A5 TfiO 
 
 Bottle Dropping, Schuster, with ground glass stopper, capacity 30 cc 25 
 
 '■ " " same as No. 22160 but without glass stopper 15 
 
 Bottle, Cobalt or Acid, with solid glass stopper and glass cap ground on. 
 
 Capacity, cc 15 25 50 
 
 Each .30 
 
 Bottle, immersion Oil, with loose fitting glass cap, with glass dropping rod fused to sann 
 
 .40 
 
 22172, Bottle, Immersion Oil, New Form, with loose fitting metal cap and dropper. The immersion oil is 
 used in the inside receptacle only in small quantities at a time so that it is impossible to with- 
 draw a large drop. The outer compartment is to be filled with benzole, xylol, alcohol, etc., for 
 cleaning; objectives and slides, havmg no connection with the inside or oil compartment. . . .75 
 
 22174, Bottle, Immersion Oil, Bausch & Lomb, with metallic cap , ..50 
 
 22176. Bottle, Immersion Oil, Mach, with metallic cap 75 
 
 22180. Bottles, Specimen, wide mouth, of f^int glass, for cork stoppers. 
 
 Capacity, ounces 1| 2^ 3 j 
 
 Per dozen ' .50 .-55 .65 
 
 Per gross 3.90 4.40 .).15 
 
 22184. Bottles, Specimen, extra wide mouth and very narrow .shoulder, of best Arnefiean fliiLt glass, for cork 
 
 stoppers. 
 
 Capacity, oz If 3 4 6 
 
 Per dozen .60 .65 .85 ^5 
 
 22185. Bottles, Specimen, with extra wide mouth for cork stoppers. Of best white German glass. This 
 
 series of bottles has been designed to meet the need of a more satisfactory bottle for specimens 
 in pathological and histological laboratories, etc., and is superior in both shape and finish to the 
 American bottle listed under No. 22184. 
 
 Capacity, etc 15 __30 50_ 75 100 
 
 Per 10 " .60 .65 .75 ' .85 1.00 
 
 Per 100 5.00 5..50 6.00 7.00 S.OO 
 
ARTHUR H. THOMAS COMPANY 
 
 if' 
 
 ^jmii^ ^tWI^ 
 
 Bottles, Narrow Mouth, best American Hint glass for cork stoppers. 
 
 Capacity, ounces h 1 2 3 4 6 8 10 12 16 32 64 
 
 Number in original case. 864 864 720 576 432 360 288 2 16 216 144 96 
 
 Per dozen.. .35 .40 .50 .50 .55 .65 .70 .85 .90 1.05 1.55 2.60 
 
 Per gross in original case 3.2.5 3.50 3.90 4.75 5.40 6.15 7.00 8.25 9.00 10.15 15.50 25.65 
 
 Bottles, Narrow Mouth, best American amber glass, for cork stoppers. Shape same as No. 22200. 
 
 Capacity, ounces 1 2 3 4 6 8 10 12 16 32 
 
 Number in original case 864 720 57 6 432 360 288 _216_ 216 144 _ 96 
 
 Per dozen . 35 .40 .50 .55 .65 .70 " .85 .90 1.05 1.55 
 
 Per gross in original case 3.-50 3.90 4.75 5.40 6.15 7.00 8.25 9.00 10.15 15.50 
 
 Bottles, Narrow Mouth, best American green glass, for cork stoppers. 
 
 Capacity 1 oz. 2 oz. 4 oz. ^ pt. 1 pt. 1 qt. 2 qt, 1 gal, 5 gal. 
 
 Number in original case 864 720 432 288 144 96 48 36 6 
 
 Per dozen .35 .40 .55 .70 1.05 1.55 2.40 4.00 17.00 
 
 Per gross in original case 3.50 3.90 5.40 7.00 10.15 15.50 24.00 40.00 170.00 
 
 Bottles, Wide Mouth, best American flint glass, for cork stoppers. 
 
 Capacity, ounces t 1 2 3 4 6 
 
 Number in original case _^^4 ^''i T^ 576 432 360 
 
 Per dozen ".35 740 .40 .50 .60 .65 
 
 Per gross in original case 3.90 3.65 4.00 4.90 5.65 6.40 
 
 Capacity, ounces 8 12 16 24 32 64 
 
 Number in original case _28S 216 144 120 96 48 
 
 Per dozen 75 .95 1.10 1.45 1.50 2.65 
 
 Per gross in original case 7.25 9.50 10.65 14.50 15.90 26.15 
 
 Bottles, Wide Mouth, best American amber gass, for cork stoppers. Shape same as No. 22210. 
 
 Capacity, ounces 1 2 4 8 16 32 
 
 Number in original ease 864 720 432 288 144 96 
 
 Per dozen 40 .40 .60 .75 1.10 1.50 
 
 Per gross in original case 3.65 4.00 5.6.i 7.25 10.65 15.90 
 
 Bottles, Wide Mouth, of green glass, for cork stoppers. 
 
 Capacity 1 oz. 2 oz. 4 oz. 8 oz. 16 oz. 1 qt. 2 qt. 1 gal. 2 gal. 5 gal. 
 
 Number in original case. . 86 4 720 432 _2S8 14 4 96 48 12 6 
 
 Per dozen 36 .40 .60 .75 1.10 1.60 2.50 4.10 12.80 18.35 
 
 Per gross in original case. 3.65 4.00 5.65 7.25 10.65 15.85 24.50 40.15 102.50 175.00 
 
 Bottles, Narrow Mouth, flint glass, with high ground mushroom glass stopper. This bottle has a fine, 
 fire polished finish approaching shop furniture ware in appearance and is much superior to iron 
 mould finish. Recommended specially for laboratory or other uses where a bottle of better ap- 
 pearance is desired. 
 
 Capacity 1 oz. 2 oz. 4 oz. 6 oz. 12 oz. \ pt. 
 
 Number in original case 144 72 72 72 72 2 
 
 Per dozen 1.00 1.25 1.50 1.65 " ~ l790~ LTS 
 
 Per dozen in original case 80 1.00 1.20 1.35 1.55 1.40 
 
 Capacity 1 pt. 1 qt. § gal. 1 gal 2 gal. 3 gal. 
 
 Number in origina! case 72 36 12 12 6 4 
 
 Per dozen 2.00 2.25 4700 6.00 13.00 20.00 
 
 Per dozen in original case 1.60 1.80 3.20 4.80 10.40 16.00 
 
 Bottles, Wide Mouth, same quality, etc., as No. 22222. 
 
 Capacity 1 oz. 2 oz. 4 oz. ^ pt. 1 pt. 1 qt. ^ gal. 1 gal. 2 gal. 
 
 Number in original case 14 4 72 _ 7 2 72 72 36 12 12 
 
 Per dozen r.25 1.50 1J5 2^25 2^50 3^ 5^ 8^ 18.00 
 
 Per dozen in original case 1.00 1.20 1.40 1.80 2.00 2.60 4.00 6.40 14.40 
 
ARTHUR H. THOMAS COMPANY 
 
 Bottles, Narrow Mouth, with vertical glass stopper, of green glass, for acids. 
 
 Capacity \ pt. 1 pt. 1 qt. ; gal. 1 gal. 2 gal. 
 
 Number in original case 144 144 96 4S 36 12 
 
 Per dozen 2.00 2.50 3M 5X0 7.60 "ISTOO 
 
 Per gross in original case 20.00 25.00 34.00 56.00 76.00 160.00 
 
 Bottles, Narrow Mouth, of white glass with flat glass stopper. These bottles are of German make and 
 are distinctly superior in both shape and finish to American bottles of corresponding price. They 
 are turned in a wet wooden mould which imparts a high lustre to the outside surface. Particu- 
 larly recommended for use as laboratory reagent bottles. 
 
 Capacity, cc 15 30 60 125 250 500 1000 2000 
 
 Number in original case 1800 1100 600 500 325 180 120 60 
 
 Each 10 .10 .12 .15 .18 .25 .35 .45 
 
 Per 100 in original case 8.40 8.40 9.S0 10.85 15.40 19.60 28.00 38.50 
 
 Bottles, Narrow Mouth, of white glass, with vertical stopper. Same quality as No. 22234. 
 
 Capacity, cc 15 30 60 125 250 500 1000 2000 4000 8000 
 
 Number in original case - . . 1800 1100 600 500 32 5 180 1 20 60 36 13 
 
 Each 10 .10 .12 .15 " .18 .25 .35 .45 .75 1.50 
 
 Per 100 in original case. .. . 8.40 8.40 9.80 10.85 15.40 19.60 28.00 38.50 56.00 129.50 
 
 Bottles, Narrow Mouth, of amber glass, with vertical stopper. Same quality and shape as No, 22238, 
 
 Capacity, cc 30 60 125 250 500 1000 2000 
 
 Number in original case 1100 600 500 325 180 1 20 60 
 
 Each 11 .13 .14 .20 .25 .35 .50 
 
 Per 100 in original case 9.45 10.85 11.90 17.15 21.70 30.80 42.00 
 
 Bottles, Wide Mouth, of white glass, with flat glass stopper. Same quality as No. 22234. 
 
 Capacity, cc 15 30 60 125 250 600 1000 2000 
 
 Number in original case 1800 UOO 600 o00_ 325 _ 180 ^120 _60 
 
 Each 11 .11 .13 .14 .20 .25 .35 .50 
 
 Per 100 in original case 9.45 9.45 10.85 11.90 17.15 21.70 30.80 42.00 
 
 Bottles, Wide Mouth, of white glass, with vertical stopper. Same quality as No. 22234. 
 
 Capacity, CO 15 30 60 125 250 500 1000 2000 
 
 Number in original case 1800 1100 6 00 500 32 5 180 120 ^60 
 
 Each 11 .11 ,12 .14 .20 ,25 ,35 .50 
 
 Per 100 in original case 9.45 9.45 10.15 11.90 17.15 21.70 30.80 42.00 
 
 Bottles, Wide Mouth, of amber glass, with vertical stopper. Same quality and shape as No. 22250. 
 
 Capacity, cc 30 60 125 250 500 1000 2000 
 
 Number in original case _ 1100 m 500 325 180 120 60 
 
 Each ,12 .14 .15 .22" !28 ,40 VSO 
 
 Per 100 in original case 10.15 11.90 13.15 18.60 23.80 33.60 46.25 
 
 Bottles, New Jena Glass, narrow mouth, with fiat glass stopper. These bottles are made of apparatus 
 glass and are offered as the most resistant bottle obtainable for reagents. 
 
 Capacity, cc 100 250 500 1000 
 
 Each .43 .45 .70 .95 
 

 REAGENT BOTTLES, S. B. S. Type, of best German glass, with conical stopper with projecting dange to pro- 
 tect the bottle from dust in the narrow mouth shape and a fiat hexagonal stopper projecting over the 
 rim in the wide mouth shapes. The stopper can be placed on the table either on its side or inverted, 
 without contact of the ground surface. Bottles for alkaline solutions, such as Potassium hydrate are 
 made with a loosely fitting stoppers inside the neck but with the under side of the flange ground to fit 
 the upper surface of the mouth of the bottle. Bottles are carried in stock in the labels designated 
 below. Labels are deeply etched into the glass by means of sand blast and filled with white pigment. 
 Jn ordering please use numbers. Special labels are engraved to order at an extra cost of 25^ each. 
 The Bottles may be imported duty free at an approximate reduction of 33^%, but orders must aggre- 
 gate at least 100 bottles of a size. 
 
 22270. Reagent Bottle, Narrow Mouth, 125 cc capacity, as above, with labels as below. 
 
 Each 
 
 Per dozen 
 
 -\raei 
 
 2.50 
 
 B19 
 
 C b 
 
 H CC 
 
 -,„ CO 
 
 am ti m Chlo de BaC 
 B21. Calcium Chloride CaCl! 
 B22. ■' Sulph.ateCaSO( 
 
 B23, " Hydro-vide Ca (OH), 
 
 Reagent Bottle. Narrow Mouth, 250 c 
 Each 
 
 sulphur I 
 
 B101. 
 
 B102. Dil Hi&U. 
 
 B103. Nunc Acid Con H\n, 
 BI04. Dil IINOj 
 
 BIOS. Hvdro ! r \ i I i 
 B106. I) I H 
 
 B107. HidTon [ I [ \r 
 
 m Sulpnale Ms SO. 
 
 Chloride Hg Cli 
 
 B26. Silver Nitrat« (Amber) Ag NOj 
 
 B27. Lead Acetate Pb (CtHjO!)! 
 
 B28. Ferroua Sulphate FeSOi 
 
 B29. Ferric Chloride FeiCU 
 
 830. Alcohol CiHsOH 
 
 B3I. Ammonium Sulphocyanide NHiCNS 
 
 B32. Barium Hvdro>:ide Bfl(OH), 
 
 B35. Ether (CiHi)20 
 
 B36. Cupric Sulphate CuSO. 
 
 B37. Platinic Chloride PtCI. 
 
 B.5fi. Uranium Acetate U0j(C:H30:)! 
 
 B5S. Fehling's Solution 
 
 B59, Sodium Carbonate NaiCO.* 
 
 BGO. " Acetate NaC:HsO; 
 
 BSI. " Hydroxide NaOII 
 
 B81. Stannoun Chloride SnCI; 
 
 Ba2. Ammonium Molybdate (NH.lsMoO. 
 
 B83. Carbon Diaulphide CSi 
 
 R86. Mercurous Nitrate Hgi[NO]i: 
 
 B96. Potassium Chromate KiCrO. 
 
 .IS uliove, widi l;d.iels iis below, 
 .30 Per dozen 3.20 
 
 BllJ. Barium Chloride BaCIj 
 
 Rill, ^odi :i II 
 B112. 
 
 Reagent Bottle, Narnj\ Moulli .0(1 tc ca|i;uiLv, a,-^ a 
 
 Each ". .40 Per d £e 
 
 B304. Ammoiiiuin Hydroxide XHiOH B21b, !\,tTK And UN'Oj 
 
 B2I5. Sulphuric Acid JhSOt B217. Hydrochloric Acid HCl 
 
 Reagent Bottle, Narrow Mouth, 1000 cc caiiacity, as above, with labels as below. 
 
 Each 50 Per dozen 
 
 B50I. Sulphuric Acid, Con, HiSOt R5I)5. Hydrochloric Acid, Con. HCl 
 
 " ""' BSOIi. " '■ Dil, NCI 
 
 Etr^I2. .Vrnriioniiini Hvdroxi<lc NH.OH 
 
 B502. 
 
 
 .. 
 
 " Dil.HiSO 
 
 Hm. 
 
 Nil 
 
 r ,A" 
 
 i.Con. HNOi 
 
 R504. 
 
 
 
 Dil, HXl). 
 
222S6. Reagent Bottle, Wide Mouth, 12'> 
 Each 
 
 ; abovu describeii, witli 
 .2'} Per dozen — 
 
 2.80 
 
 B301. Sodium Ciirbonu 
 
 B302. Potaasium Nitm 
 B303. " C\an 
 
 B304. Borax NajB.O: 
 
 ) NaiCOs 
 . KNCij 
 
 lo KCS 
 
 B305. Ferrous Sulphate FeSO, 
 B312. Teat Paper 
 
 B313. Sodium Ammoaium Hydrogen Plioaphate Na(NH.) 
 HPO.+4HiO 
 
 Reagent Bottles. Set of 40 as above deacribud, with lubels as per list below, consisting of 2S narrow 
 mouth 125 cc Bottles; 5 narrow mouth 2o0 cc Bottles; 6 wide mouth 125 cc. Bottles and one 30 
 fc dropping bottle 8.00 
 
 Reagent Bottles, Set of 40 as above described, filled with the following c, p. reagents, sealed and 
 packed 17.00 
 
 I., ,.l \,, I , I'|.,(-,H OjI, 
 \. . . , I., -.1.' .iiMeMe^O, 
 
 \l. ■ r .r.MgCli 
 
 M,.,, .... .,- nr ,[■■ HE5fN0»)i 
 Pi^iunum (.tiloiide PtCIi II OS ilropi.iiig Lottie] 
 Potaaaiuni Acid Chroniate KiCrjOi 
 Ferrooyanide KiFe(CN")c 
 Iodide Kl 
 Sodium Carl-.onate NajCOi 
 " Acetate NaCsHsOi 
 " Plioaphate NajHFO. 
 Uranium Acetate (UO)CiHjO; 
 Ether {CiHsjiO 
 Blank 
 125 cc Wide Mouth Bottles 
 
 Sodium Carbonate Na-.COs 
 Boraj: 
 
 Ferrous Sulphate FeSOi 
 Potaaaium Cyanide KCN 
 Ammonium Sodium PIlosi.Ik.l^ XrUNHijHPO. 
 
 +4H.0 
 Teat Paper 
 
 REAGENT BOTTLES, Whitall-Tatiim Companj, with ground glass labels, blown in the glass, the surface of 
 each letter being ground so is to lender it distinct. The lettering is thus indestructible and in no 
 danger of beng def iced when the bottle is washed or handled, and the inconvenience and unsightly 
 appearance attending the use ot paper labels is entirely avoided. The bottles are made of glass con- 
 taining no lead, zinc or other metallic: flux, and, In the points of convenient shape, thin, dropping 
 lip and perfect stoppering, are unequalled. They are exclusively used in many of the leading labo- 
 ratories in the U. S. See illustration on preceding page. 
 Reagent Bottles, Narrow Mouth, as above described. For names available in each capacity see list 
 
 below. Names not in list may be engraved on bottles at an extra charge of 50fi per dozen net. 
 
 Please use numbers in ordering. 
 
 C 1 oz. 1 pt- 2 pt. 1 pt. 1 qt . 
 
 Pe doz n "l.2.5 VI5 ~2M~^ 3^25 4.00 
 
 250 cc Narrow Mouth Bottles. 
 
 Acid Sulphuric (dil) IJ-.^^iJ, 
 " Hydrochloric HCI 
 ■■ Nitric HN<":, 
 
 Ammo.iium Ilvdrate (NH^IHO 
 
 Blank 
 
 125 cc Narrow Mouth Bottles 
 
 Acid ^uiphuru i luc if ^' 'i 
 
 Acid Ateti' 111. IIjUi 
 Alfohol rCjHsiOH 
 Sihpi Nitrate ■\ENOji.iiiih'.r: 
 Bunuin ehlondeBieb 
 Cakiuju H', irjteCa(UH)! 
 Cuprk Sulfate CuSOi 
 Ferric C hlonde FesCU 
 H\drii ^uipliideHiS (amber 
 Ammuijium Sulfide (NH,J -5 
 
 22300. K. 
 
 Pe 
 
 agen 
 
 B 
 
 
 
 .. 1 oz. 
 
 i pt. h pt. 
 
 Ipt. 
 
 
 
 1.25 
 
 1.75 2.50 
 18.50 23.00 
 
 3.25 
 
 
 
 . . 12.00 
 
 33.00 
 
 h t n oun e 
 
 he ght, 
 
 , 3i inches. 
 
 
 
 
 
 ' ■'' liii. 
 
 Silver \;t.r:Heami.or) 
 
 Blank 
 
 ... AgNOi 
 
 Mou h One fou h 
 
 p nt, h< 
 
 eight 5i inches. 
 
 
 H H 
 
 
 No. 97. 
 
 
 ...NH,HS 
 
 
 
 
 
 
 H 
 
 
 ■' 126. 
 
 Bromine for Hypo-Bromit« 
 
 
 
 
 " 406. 
 
 
 
 H 
 
 
 ■■ 418. 
 
 Calcium Chloride Aiihydro 
 
 us.CaCli 
 
 H 
 
 
 " S3. 
 
 Carbon Diaulphide 
 
 ...CS, 
 
 
 
 ■' 107. 
 ■' 408. 
 ■■ 409. 
 
 Chloroform 
 
 Cochineal 
 Coralline 
 
 
 
 
 •■ 421. 
 
 
 .. (Clhl^C. 
 
 
 
 ■■ 419. 
 ■' 428 
 
 Hydrochloric Acid, Con... 
 I\ Jrogen Pero\ide 
 
 ...nci 
 
 
 
 ,. ,j 
 
 r digo '^olutlm 
 
 
 
 
 ■■ 414 
 
 
 
 
 
 ■ 410 
 
 
 
 H 
 
 
 ■• 90 
 
 I isne'-i'J Mi\ture 
 
 
 The above 40 boilies are Tur- 
 
 nished as a sel for S5.7,5 
 
 Ammonia FHi 
 
 . Ammonium Molylidate fNlfil^MorC 
 
 Kihc Aud 
 
 
 H,C-CN 
 
 1 1, 1 ol 
 
 n i iujI , 
 
 r ite 
 
 
 1 .HsOH 
 
 LsHiOHiN* 
 PtCU 
 
 KiCrO, 
 
 \giSOj 
 
 NaCsHjO, 
 
 ' rl m^te 
 
 
 N-iCOd 
 
 1 jljnltif Nitntf 
 
 
 Ih dro\iJe 
 
 ITsp 
 
 
 Bronite 
 
 
 NaOH 
 
 Thnsulphat 
 
 
 N11S2O1 
 
 si,u ii'il hlonie 
 
 
 
 Sulphuric Acid, Con.. 
 
 
 ...HiSO, 
 
 ruict.Guaiac 
 
 
 
Reagent Bottles Narrow Mouth, One-half pint, height 6;- inches 
 
 No 107 Hvdmgen Sulphide (\mbrr) HjS 
 
 ■' 126. 
 
 \l.ohol 
 
 
 ( B nil 
 
 
 I-.2 
 
 Ipid \<etdte 
 
 i'i,t< H,0 )= 
 
 " 157. 
 
 
 
 MI J 
 
 
 153 
 
 Mercuric Thlnnde 
 
 Hu( 1 
 
 " 110. 
 
 
 
 (N hjCv, 
 
 
 lot 
 
 Nitric Vld fon 
 
 HMij 
 
 •■ 109. 
 
 riiloncie 
 
 
 NI .( 1 
 
 
 104 
 
 ' Dil 
 
 IIMJ, 
 
 " lOS. 
 
 H\dro-.idp 
 
 
 NI OH 
 
 
 150 
 
 Pntissium HidroMdf 
 
 KMll 
 
 " 155. 
 
 Moh hdate 
 
 
 (N <k\ro(h^ 
 
 
 145 
 
 ■-ihpr \ilrit< '^nih^ri 
 
 
 " 130. 
 
 TK date 
 
 
 (N ,)C U. 
 
 
 
 
 
 " 122. 
 
 'Mdphide (Amh 
 
 
 
 111 
 
 
 \ i<m 
 
 " 114. 
 
 Barium Chloride 
 
 
 Bd( ! 
 
 
 Ut 
 
 I 1,^.^1 hnt^ 
 
 \ i HP()( 
 
 " 151. 
 
 Cak.um Hydroxide 
 
 
 r-afOHl 
 
 
 15F 
 
 
 Snf 1 
 
 *■ 154. 
 
 Fpitoui '^ulphatp 
 
 
 FeS( .. 
 
 
 nil 
 
 Sulphunr 4m 1 (en 
 
 H'~<)i 
 
 ■■ 105. 
 
 H\drorhIonL \cid Con 
 
 
 
 
 102 
 
 
 
 ■' 1(16. 
 
 Dil 
 
 
 HPl 
 
 
 116 
 
 Blank 
 
 
 Reagent Bottles, Narrow Mouth, 
 
 One pint, height 7^ inches 
 
 
 
 No. 204. 
 
 
 
 NH,()H 
 
 N 
 
 ?.?.?. 
 
 
 HCI 
 
 '■ 227. 
 
 
 111 
 
 NH,(iH+^q 
 
 
 226 
 
 H^drodi'-odii Phi.'<phate 
 
 NaiHPOi 
 
 " 229. 
 
 Sulphide 
 
 ■>il 
 
 (NH^)S+lq 
 
 
 2Ib 
 
 Nilric 'LCI 1 
 
 HNOj 
 
 
 Bjrmm Chloride 
 
 
 
 
 219 
 
 
 
 ■■ 223. 
 
 
 
 C^(()H| 
 
 
 221 
 
 
 KOH 
 
 " 225. 
 
 feulpiiate 
 
 
 ( aS( 1, 
 
 
 22S. 
 
 bodium Hydroxide, Dil... 
 
 .,.,NaOH+Aq 
 
 
 
 
 
 
 215. 
 
 Sulphuric Acid 
 
 
 
 Ferroui Sulphite 
 
 
 FeSOn 
 
 
 220. 
 
 
 
 " 217. 
 
 H^drothlonc Acid 
 
 
 Hri 
 
 
 211. 
 
 
 
 Reagent Bottles, Narrow Mouth, 
 
 One quart height 9 
 
 inches 
 
 
 
 No. MiS. 
 
 Ilidrofhloru A.<.id Con 
 
 
 Hri 
 
 No 
 
 501. 
 
 Sulphuric Arid, Con 
 
 .... H=SO, 
 
 
 
 
 
 
 
 
 
 " 503. Nitni -^fid Ton HNO] " 511. Blank 
 
 " 504. Dil HNOj 
 
 Reagent Bottles, Wide Mouth, as ibove described. 
 
 Capacil\ . , . , . . 
 
 Per dozen 
 
 Per gross 
 
 Reagent Bottles, Wide Mouth, One ounce, height 3J inches. 
 No. 374. Ammouium Phosphate (NH.l HPO 
 
 361, ■• aodium Phosphat« NaNH.HPl 
 
 351. Borax " " ' 
 
 364, Copper. 
 
 3GS, Ferrous Sulphate 
 
 366. ■' Sulphide 
 377. Phenyl Hydraiine 
 
 367, Potaasium Chlorate 
 358. " C>anide 
 
 Tu 
 
 FeSO, 
 
 FeS 
 
 f hH Nil NH, 
 K( 11 )j 
 K(_N 
 KiF^d 
 
 No. 354. Potassium Nitrate 
 
 ' 372. Test Paper 
 
 353. Sodium Acetate 
 
 369. " Bitartrate 
 
 350. " Carbonate 
 
 370. " Nitrate,, 
 
 367. Sodium Potassium Carhor 
 
 371. Starch 
 ,173. Zin 
 
 1.3.5 1.95 
 
 13.00 20.50 
 
 ..KNOa 
 
 . . NaC2H30j 
 
 ..NaHCH.OE 
 
 . . NaiCOs 
 
 . .NaNO^ 
 
 , .NaiCOs, KiCOi 
 
 22324. Reagent Bottles, Wide Mouth, Four ounce, height, 4^ inches. 
 
 375. Blank 
 
 305. FerrousSulphate 
 303. Pota-^aium Cvanide 
 302. " Nitrate 
 
 (NH.iv 
 
 Fe&O, 
 KCN 
 
 KNOj 
 
 
 Phosphate 
 
 XafNH.jHPO. 
 
 +4H,0 
 
 ,301 
 
 Sodium Carbonate 
 
 . , Na-COi 
 
 312. 
 
 Test Paper 
 
 
 View of Shipping lt< 
 
/ s 
 
 Barium 
 chloride 
 
 r 
 
 REAGENT BOTTLES, Narrow Moulh, with name and symbol, of hard white potash glass, with 
 polished bottoms, and flat stoppers; with white enamelled labels with double border and 
 brilliant black acid proof letters and figures for both name and symbol. Exactly like illustration. 
 Because of the great variety of labels used and the alternatives offered these bottles are not carried 
 in stock and are imported to order only in quantities aggregating not less than $25.00 in value. 
 
 100 
 
 Capacity, cc 50 
 
 Each, Duty Free 30 .35 .40 
 
 Each, Duty Paid 45 .50 .50 
 
 Keagent Bottles, Wide Mouth, otherwise same as above. 
 
 Capacity, cc 50 100 _ __125 
 
 Each, Duty Free 30 .35 .40 
 
 Each, Duty Paid 45 .50 .50 
 
 2,50 
 .15 
 
 .45 
 .60 
 
 . 500 
 .50 
 
 1000 
 
 2000 
 
 4000 
 
 .60 
 
 ..S5 
 
 .85 
 1.15 
 
 1.25 
 
 1.75 
 
 lOOU 
 .70 
 .95 
 
 2000 
 .90 
 1.25 
 
 4000 
 1.30 
 1.85 
 
 Note— While we recommend Bottles as listed undfr No. 22328 and 22332 as standard, we offer the follow- 
 ing alternatives in style, finish, etc. 
 22336, Alternative I. With upright stoppers at same price as regular Xo. 22328 and 22332 with flat stop- 
 pers. 
 22340. Alternative II. Of amber or blue glass instead of white, add the following to price of No. 22328 and 
 
 Capacity, cc 50_to_10C^ ^5 to 1000 2000 4000 
 
 Each, Duty Free .02 .03 .05 .08 
 
 Each, Duty Paid 03 .04 .08 .10 
 
 2'*344. Alternative III- Tor desk number on label and =topper, add the following to price of Xo, 22328 and 
 22332. 
 
 Capacity, cc oO_to IW 125 to 10 00 2000 4000 
 
 Each, Duty Free .03 .06 .06 .08" 
 
 Each, Duty Paid 05 .10 .10 .12 
 
 22348. Alternative IV. For loose fitting glass caps (Fig. 2) add tiic following to price of Xo. 2232S (narrow 
 mouth). 
 
 Capacity, cc oO to 100 125 to 100 _ 2000 4000 
 
 Each, Duty Free 06 10 .12 .15 
 
 Each, Duty Paid 10 .15 .16 -25 
 
 22352 Alternative IV. For loose fitting glass cap, add the following to price of Xo. 22332 (wide mouthl. 
 
 Capacity, cc 50 to 100 125 to lOOO 2000 4000 
 
 Each, Duty Free 08 .12 .15 [20" 
 
 Each, Duty Paid 12 .16 .25 .30 
 
 22356. Alternative V. For label like No. 2232S but without chemical symbol deduct the following from 
 price of No, 22328. 
 
 Capacity, cc 50 100 125 250 500 1000 2000 4000 
 
 .12 .15 
 
 Each, Duty Free . 
 
 .08 .08 .10 .12 .1 
 
 Each, Duty Paid, .12 .12 .12 .15 .16 .16 .20 .25 
 
 Note — Prices for square or diagonal cut stoppers with and without fiange, labels with etched lettering, 
 labels without border, lettering without background, etc., will be sent upon application. 
 
 Bottle Caps, of glass, to fit over the stoppers of Reagent Bottles. 
 
 Inside diameter of cap, mm. 26 30 35 39 45 40 60 
 
 Capacity of bottle, cc 30 _ 60 125 250_ __ _5M _ 10 00 2000 
 
 Per ten 1-00 " 1.00 ' l.OO 1-00 1.00 1.50 1.50 
 
Ice ~10U0[ 
 I ^900 f 
 
 -800 ; 
 f; ^700 ! 
 
 ■ --G0O i 
 
 No. 2236.I N». 2236S 
 
 P-f( 
 
 .. 22392 No. 2239fi No. 22400 
 
 Bottle, GratJuateti. nf flint glass, with 
 
 22392. 
 22396. 
 22400. 
 22404. 
 2240S. 
 
 22412. 
 
 No. 224U4 No. 22408 
 
 ;lass Stopper. So-called "mixing jar." 
 
 250 
 
 No ■'■'412 
 .=,00 1000 
 
 100 
 
 l.iO 
 
 200 
 
 . .30 .32 .35 
 
 widely used for all volatile 
 
 250 
 .65 
 
 500 
 .90 
 
 1000 
 1.40 
 
 250 
 
 500 
 
 1000 
 
 I.OO 
 
 l..iO 
 
 2.-5 
 
 720 
 
 4 
 4.32 
 
 S 
 144 
 
 Each • 1.25 2.00 3.00 
 
 Bottle, Pressure, Lintner, complete with metallic clamp. Capacity 125 cc 2.75 
 
 " " of heavy glass, with patent stopper. 
 
 Capacity, cc 
 
 Each 
 
 Bottles, Ether, of glass, with ground in stopper and ground on glass cap, 
 
 liquids. This is a well made imported bottle. 
 
 Capacity, cc 50 _ _100 
 
 Each .45 .50 
 
 Bottles. Hard Rubber, with paraffine seal and screw cap, for acids. 
 
 Capacity, cr 100_ 
 
 Each 75 
 
 Bottles, Oil Sample, of flint glass, tall, narrow shape. 
 
 Capacity, ounces 1 
 
 Number in original case 864 
 
 Per dozen .40 
 
 Per gross in original case 3.75 
 
 Bottles, Oil Sample, same as No. 22384 but with metallic screw cap with cork lining. Capacity 4 oz., 
 
 length 6f inches, diameter Its inches. Packed 432 in original cases. 
 
 Each 12 
 
 Per dozen 1 .05 
 
 Per gross in original case 10.25 
 
 Bottles, Woulff, with two necks. 
 
 Capacity, cc 125 250 500 
 
 Each 40 .45 .60 
 
 Bottles Woulff, with two necks and bottom tubulation. 
 
 Capacity', cc 
 
 Each 
 
 Bottles, Woulff, with three necks. 
 
 Capacity, cc 125 250^ 500 
 
 Each 45 .50 " .65' 
 
 Bottles, Woulff, with three necks and bottom tubulation. 
 
 Capacity, cc 
 
 Each. . 
 
 1000 
 
 4.90 
 
 2000 
 
 6,50 
 
 4000 
 
 .95 
 9.25 
 
 8000 
 
 .85 
 
 1.20 
 
 2.50 
 
 4.00 
 
 500 
 
 1000 
 
 2000 
 
 4000 
 
 .80 
 
 1.00 
 
 1.50 
 
 3.00 
 
 1000 
 
 2000 
 
 4000 
 
 8000 
 
 .95 
 
 1.35 
 
 3.00 
 
 5.00 
 
 500 
 
 1000 
 
 2000 
 
 4000 
 
 .90 
 
 1.20 
 
 2.00 
 
 3.50 
 
 Bottles, Woulff, with three necks, two of which are fitted with ground in glass delivery tubes and one 
 
 with ground in glass stopper. 
 
 Capacity, cc. . . .". 125 __ 25 500 
 
 Each 1.00 1.25 1.60 
 
 Bottles, Water Sample, 2 oz. capacity, with fiat ground in stopper. Both bottle and stopper can be 
 
 numbered with serial number. As used in large quantities in the Filtration Laboratories of the 
 
 Philadelphia Bureau of Water, etc. 
 
 .Style Plain Numbered 
 
 Each , 
 
 .25 
 
 Per dozen 3.00 
 
 3.60 
 
22424. 
 22428. 
 22432. 
 
 Boxes of paste board, so called "pill boxes." Covered with fine glazed paper, ("irrnirif color. 
 
 Diameter, inches " f 1 fJ fi 
 
 Depth, inches ^ -^ ]-i I 
 
 Per gross ^25 .35 .40 .50 
 
 In packages of 1 dozen of each size nested, per package. 12 
 
 Boxes of paste board, sliding form, covered with fine white glazed paper. 
 
 Length, inches 24 2^ 2| 
 
 Width, inches l\ 1-^ l| 
 
 Depth, inches | | | 
 
 Per dozen 15 .15 ,15 
 
 Per gross 1.00 1.00 1.00 
 
 Boxes, of seamless tin, round form. Convenient for samples and specimens. 
 
 Capacity, ounces i 1 2 4 
 
 Per dozen TTo ""TlO^" ^0 .30 
 
 Boxes, of turned wood. Convenient for samples and specimens. 
 
 C'apacity, ounces ^ 1 2 3 
 
 Per dozen T08 JO ^14 ^ 
 
 Brush, of bristle, for assay buttons 50 
 
 22436. 
 22440. 
 22444. 
 
 22448. 
 22452. 
 
 22460. 
 22464. 
 
 22472. 
 22476. 
 
 t f 
 
 No. 22476 No. 22480 
 
 Brush, of black horse hair, 9 inches long, with wooden handle. For cleaning small cylinders, etc. .20 
 " of black bristle, conical shape, with tuft on end, 12 inches long. For cleaning cylinders, etc .30 
 " of black and white bristle, conical shape with tufted end, with four rows of bristles. For clean- 
 ing large cylinders, jars, etc 35 
 
 Brush, of black bristle, 12 inches long. For cleaning cylinders, beakers, etc 25 
 
 " of black and white bristle, on wooden handle, with four rows of bristles. For cleaning large 
 jars, cylinders, etc 30 
 
 Brush, of black and white bristle, with two tufts on end for reaching corners of large cylinders, jars, 
 etc . With four rows of bristles 35 
 
 Brush, for beakers, with long handle of wood 20 
 
 Brush, of bristle in wooden handle, flat. Convenient for pasting labels, etc. 
 
 Width of bristles, inches Jl 1| 2 2^ 
 
 Each 05 .08 .10 
 
 Brush, of camel's hair, fiat, with wooden handle. For dusting scale pans. 
 
 Width of hair, inches _| 1^ H - 
 
 Each TTS ^ ~ .40 .50 
 
 Brush, of camel's hair, round, with wooden handle, ^ inch diameter. For dusting scale pans 40 
 
 Brush, of camel's hair, bound in quill handle. 
 
 Length of hair, mm 14_ 1$ 22 
 
 Each 05 .07 
 
 Brush, of camels hair, bound in quill, so-called "camel's hair pencils." 
 
 Number 3 5 
 
 15 
 
 .10 
 
 Size Small Medium Large 
 
 Per dozen 
 
 .25 
 
 .35 
 
ARTHUR H . 
 
 THOMAS COMPANY 
 
 i 
 
 No. 22528 No. 22S32 
 
 2lMS4. Brush, Test Tube, speoial, of stiff bristles_, 1 inch in diameter, with tuft at end. As used in the labor- 
 ;itui'ics uf the Johns Iloplcius Medical .School. Black bristles, 2 inches long, on heavy tinned 
 
 wire ; total length 13^ inches 10 
 
 22488. Brush, Test Tube, on brass wire, with bristle end. Total length 9 inches; length of bristle part 2i 
 
 inches; diameter of bristles 1\ inches 08 
 
 22'i92. Brush, Test Tube, same as No. 22488 but with sponge end 08 
 
 22496. " " " on tinned wire, with bristle end 
 
 Total length, inches ^i ft 9 
 
 Length of bristle part, inches 2^ 2J- 21 
 
 Diameter " " " " } 1} ij 
 
 Each 06 .07 .08 
 
 22500. Brush, Test Tube, on tinned wire, with sponge end. Total length 9 inches; length of bristle part 2J 
 
 inches; diameter of bristles Ij inches 06 
 
 22504. Brush, Test Tube, with tufted ends. Total length 9 inches; length of bristle part 3 inches; diameter 
 
 of bristles I| inches 05 
 
 22508. Brush, Test Tube, with sponge end and rattan handle 06 
 
 22512. Brush, Flask, convenient for Babcock milk test bottles, etc. Total length 9^ inches; diameter of 
 
 large bristles 2 inches; diameter of small bristles ^ inch 05 
 
 22516. Brush, Tube, total length 13 inches; length of bristles 2? inches; diameter of bristles h inch. Per 
 
 dozen " .IS 
 
 22520. Brush, Tube, total length 36^- inches, length of bristles 5 inches, diameter of bristles } inVli 
 
 22524. Brushes, of the general shape of Test Tube Brushes, No, 224S8 to 22500, but larger, for cleaning 
 ders, large tubes, bottles, etc. Mounted on brass wire. 
 
 Total length, inches U 
 
 Length of bristle part, inches 3 
 
 Diameter of bristles, inehee 2 
 
 Each .15 
 
 22528. Burettes, for pinchcock. 
 
 ( 'apacity, cc 10 25 oO 50 75 100 
 
 Graduated in cc yo t'i> ? t^ \'„ \ 
 
 Each 50 .65 1.00 1.20 1.75 1.75 
 
 22532. Burettes, for pinchcock, with side tube for refilling. 
 
 Capacity, cc 25 50 
 
 Graduated in cc -jL j^ 
 
 Each ~j^ 1.30 
 
 22536. Burette Attachment, consisting of rubber tubing, pinchcock and tip . For use on burettes No 
 
 and No. 22532 ' _ .25 
 
 22540. Burette Attachment, consisting of T tube, tip, three rubber connections and two pinchcocks. For 
 
 use in refilling burettes No. 22528 50 
 
 22544. Burettes, with straight glass stopcock. 
 
 Capacity, cc 10 25 25 50 .50 75 100 100 
 
 Graduated in cc. to _j^ ^ I vo iV i ys 
 
 Each 1.00 1.35 1.65 1.75 1.85 2^5 2^35 2^ 
 
 22.548. Burettes, with three-way glass stopcock. 
 
 Capacity, cc 25 50 
 
 Graduated in cc ,'„ -^ 
 
 14 
 
 .20 
 
 :10 
 
 vlin- 
 
 100 
 
 1.85 
 
 22528 
 
 Each 2.25 
 
 86 
 
 2.75 
 
 100 
 3.50 
 
No. 32552 
 
 N». 225 
 
 No, 22560 
 
 ^ 
 
 1.35 1.8.5 2.25 2.35 2.50 
 
 pcock set on at an angle and side tube for refilling with glass stopcock in same 
 50 100 
 
 23552. Burettes, with straight glass stopcock, with side tube for refilling. 
 
 Capacity, cc l^.> 50 100 
 
 Graduated in ec. re -A iV 
 
 Each 1.50 2.00" 2.65 
 
 2255G. Burettes.with glass stopcock set on ;it :\n angle. 
 
 Capacity, cc 25 5(1 75 100 100 
 
 Graduated in ec 
 Each 
 
 22560. Burettes, with glass si 
 Capacity, cc. . . . 
 
 Graduated in cc -ro t 
 
 Each 3.25 4.25 
 
 225fi4. Burettes, for pinchcock, same shape as No. 2252S (ml wil h daj-k blue enamelled stripe on white back- 
 ground for accurate reading of meniscus. See sectimiai illustration. 
 
 Capacity, cc 
 
 Graduated in ec 
 
 Each 
 
 22568. Burettes, same as No. 22564 but with straight glass stopcock. Capacity, cc, 25 
 
 Graduated in cc ,'„ 
 
 Each 2.00 
 
 22572. Burettes, same as No. 225(j4, but w ith three way glass stopcock. 
 
 Capacity, cc -5 
 
 Graduated in cc ,\, 
 
 Each 2.25 
 
 22576. Burettes, for pinchcock, same shape as No. 22528 but with two sides white enamelk 
 
 vertical stripe behind graduations for accurate reading of meniscus. See sectional illustration. 
 
 Capacity, cc .50 
 
 Graduated in cc 
 
 Each 
 
 22580, Burettes, same as No. 22576 but with straight glass stopnx'k. ('a|i:icity, re 
 
 Graduated in cc 
 
 Each 
 
 22584. Burettes, Automatic, with three-way stopcock, zero point and overflow cup, with < 
 stripe on white })ackgrounil for accurate reading ;l.s in 22564. 
 
 Capacity, cc 25 
 
 Gradu;tted in ci- -nr 
 
 Each _ ^ 3.50 
 
 22588. Burette Automatic Zero, Squiljb's latest form filled by pressure froTu rubber bulb. All joints are ground 
 air-tight and price is for the complete apparatus with bulbs, reservoir, clamp and burette; with 
 dark blue enamelled stripe on white background for ;iiini:uc reading. 
 
 Capacity, cc 25 .50 
 
 Graduated in cc -,'„ _ ,\-i_ 
 
 Each 6.00" 7.50 
 
 ol) 
 
 100 
 
 rii 
 
 A 
 
 1 .SO 
 
 2.50 
 
 51.1 
 
 100 
 
 A 
 
 A 
 
 2..50 
 
 .3.50 
 
 .:.o 
 
 100 
 
 ■i'„ 
 
 A 
 
 3.00 
 
 4.25 
 
 til transparent 
 
 al illustration. 
 
 .50 
 
 100 
 
 ro 
 
 A 
 
 1..W 
 
 2.50 
 
 .'tD 
 
 100 
 
 2.30 
 
 3.50 
 
 line enamelled 
 
 .50 
 
 100 
 
 ,'„ 
 
 A 
 
 4.50 
 
 3.25 
 
ARTHUR H. THOMAS COM F A N Y 
 
 No. 22592 No. 22^911 Nn. 22bl)0 
 
 Burette Rose Automatic Adjustable i 
 
 -^v*V» 
 
 Jf 4 
 
 No. 22f;(IJ N». 22bllN Nb. 22fil2 No 
 
 22600. 
 22604. 
 22608. 
 22612. 
 22616. 
 22620. 
 22624. 
 
 22628. 
 22632. 
 226.36. 
 22640. 
 
 apjilii'il fnr), I'l.r ropi'uti'ii lielivcrv of definite quantities. 
 Autoinali..-!Llh- lUIivui^ llir (|u:iiiiil\ al ulmli it j^ >vt ami raiiuot overflow. The guantity to 
 \»- il(li\-iTril Van !"■ quirkly rlitiuti^i 1. SpiHiLilly ro<.uLrimi>iiJe(l for nitrogen determinations by 
 Kjf-M:ilil trh'l liful, lihcr dcLLTiLiiiialiiiiiH, f;U. dctunninatiuus in imlk analysis by Babcock method, 
 
 fur |i I ■ 'ihition in sugar determinations, for solvents in ore and soil laboratories and 
 
 for tI ■ . . |. I- II- I if nutrienl solution and culture media in bacteriological laboratories. See 
 JniinnJ ■.; 'h. Aiinrican Chemical Society, May, 1910. Measuring tubes 35 x 200 mm giving an 
 approximate delivering capacity of 182 cc each 6.00 
 
 Burettes, Dispensing, wide form with glass stopcock. 
 
 ('iipa<'ity, vv 250 500 1000 
 
 (.irafiuatod in cc 5 1 25 
 
 Each JM 3750 4.00 
 
 Burette Saponification (Sapometer), Huggenberg. ,See Seifensiederzeilung 1903. .S. 795 7.00 
 
 Burette, Morse, for calibrating flasks, pipettes, burettes, etc., 500 cc G.OO 
 
 as above, 50 cc and 200 cc 6.00 
 
 " 50 cc. 3 cc and 2 cc 6.00 
 
 Two-way Stopcock for use with above as shown in illustration of No. 22604.. . 3.00 
 
 Burette, Morse, 1 cc, for small quantities, with stopcock attached 6.00 
 
 Burette Caps, of glass. Outside diameter of burette must be given in ordering. 
 
 To fit burettes, cc _Jo 50 100 
 
 Each 05 .08 .10 
 
 Burette Float. Erdmann 25 
 
 " " Vollhardt, with glass points to prevent sticking to walls of burette .40 
 
 Beutel 35 
 
 Burette Funnel. A small glass funnel <'onvenient for use in filling burettes .10 
 
 -r- 
 
 ■p Kgra 
 
 Meniscus Reader-Gockel 
 
 1 
 
 Ull BDD ^^ 
 
 No. 22641 and22MS 
 
 22644. Burette Meniscus Reader, Gockel. With glass plate 
 
 22648. " " " " Without glass plate.. 
 
ARTHUR 
 
 THOMAS COMPANY 
 
 © 
 
 22G60 No. 22676 No. 22664 No. 22f>80 No. 22668 No. 22KS4 No- 22672 No. 22S88 
 
 ETTES, PRECISION, graduated by weighing at SO'C. in accordance with the specifications of the Physi- 
 kalisch-Technische Reichsanstalt, i. e., with individual control number, time of outflow, all around 
 graduations for the whole centimeters and semi-circular graduations for the fractions, etc. These 
 burettes are offered with our unofficial factory certificate and also with the Physikalisch-Technische 
 Reichs sanstalt certificate and control stamp, i. e., the official certificate of the German government. 
 Precision Burettes with Unofficial Factory Certificate 
 These certificates are made out in the factory in exact ;iccurd:ini.'e with the methods prescribed 
 by the Physikalisch-Technische Reichsanstalt and no buretti- is nTlified unless the error falls within 
 the limit permitted by the Physikalisch-Technische Rcicli>^:instalt , The data on these certificates 
 may be used as a check where burettes arc calibrated in the laboratory or with entire reliance upon 
 the accuracy of the figures given. 
 
 Burettes, Precision, with pinchcock, rubber tubing and glass tip, graduated in accordance with the 
 requireineiits of the P. T. R. at 20° C and with unofficial factory certificate. 
 
 Size 2.5 cc in rsttis 50 cc in rsfhs, 100 cc in -j^ths 
 
 Each iJ5 3.00 ~ 4~00 
 
 Burettes, Precision, with straight glass stopcock, graduated in accordance with the requirements of 
 the P. T. R. at 20° C and with unofficial factory certificate. 
 
 Size 25 cc in ^ths 50 cc in r^ths 100 cc in rgths 
 
 Each 2.70 4.00 6.00 
 
 Burettes, Precision, with glass stopcock set on at an angle, graduated in accordance with the require- 
 ments of the P. T. R. at 20° C and with unofficial factory certificate. 
 
 Size .50 cc in vtiths 100 cc in iVths 
 
 Each 4.00 ] 6.20 
 
 Burettes, Precision, with three way glass stopcock, graduated in accordance with the requirements of 
 
 the P. T. 11. at 20° C and with unofficial factory certificate, size 50 cc in i^ths 4.60 
 
 Precision Burettes with official Physikalisch-Technische Reichsanstalt Certificate 
 These Burettes are exactly the same as those described above in workmanship and accuracy but 
 are furnished with the P. T. R. certificate and control stamp, for which a higher price must be charged 
 because of the German government fee. 
 Burettes, Precision, with pinchcock, rubber tubing and glass tip, with P. T. R. certificate. 
 
 Size 25 cc in ^ths 50 cc in Totbs 100 cc in -^tha 
 
 Each 5.25 6.15 " ~^T85 
 
 Burettes, Precision, with straight glass stopcock, with P. T. R. certificate. 
 
 Size 25 cc in -rpths 50 cc in Yo^hs 100 cc in stha 
 
 Each 6.15 7^00 ~ 9.65 ' 
 
 Burettes, Precision, with glass stopcock set on at an angle, with P. T. R. certificate. 
 
 Size _.50 cc in -^ths 100 cc in ^ths 
 
 Each 7.00 9.65 ~ 
 
 Burettes, Precision, with three-way glass stopcock, 50 cc. in rot'is; with P. T. R. certificate 7.85 
 
ARTHUR H. THOMAS COMPANY 
 
 22696. 
 22700. 
 
 22704. 
 22708. 
 
 22712. 
 22716. 
 22720. 
 22724. 
 
 22728. 
 
 22732. 
 
 22736. 
 22740. 
 
 Burette Support, Chaddock, with rubber lined wire clamps for holding the burette which i.* read- 
 ily placed m position or removed by simply springing back the wire. The rod and base are of 
 polished wood and a piece of milk white glass is fastened on the base. For two burettes. 1.50 
 
 Burette Support, same as above, but for one burette 2 50 
 
 Burette Support, consisting of rectangular base No. 37668. medium'size and adjustabie clamp No. 
 
 liio>j4 ^ ^ , Oft 
 
 Burette Support, consisting of porcelain base Xo. .376S0'and brass ciamp for one burette.'No 24554 ' ' 5'25 
 Burette Support, consisting of porcelain base Xu. 37684 with brass rod in center and brass clamp No. 
 
 24558 for two burettes 7 00 
 
 Burette Support, of wood, with cork lined clam)), for one burette .....,..,, 100 
 
 [I " ," " ■'".";« »s "bove but with an extra arm to keep tile burette steady 140 
 
 with cork lined clamp, for two burettes ' 125 
 
 " ", ". " s!>m<' as ^i.o- 23720 but with double arm to keep the burettes steady ' l!50 
 
 »ith round |,(,rcelain base, brass rod adjustable as to height and revolvin<> clamps, 
 
 tor luur burettes j-^ 
 
 Titration Outfit, consisting of wooden support and two burettes,^ aspiraVingbottlesof 1 liter capacity 
 and rubber connections, pmchcocks, etc., as shown in illustration. Complete 8 25 
 
 Support, only, without glassware g'^g 
 
 Burette Support, consisting of rectangular base No. 37672. with rod in center' and Xo' '2454'> damn for 
 
 twoburettes 125 
 
 Burette Support, consisting of automatic burette clamp No, '24.576 tor two burettes and' new'for'm 
 
 ol support permitting the use of same in the vertical position and also in a horizontal Dosition 
 
 by hanging the b.ase plate on the wall bv means of aperture |,n>\i,lc,l q 7c 
 
 Burette Support, as above but for one burette. . ^'in 
 
S3^ 
 
 22764. 
 
 22768. 
 
 22771^. 
 22780. 
 
 22786. 
 
 22787. 
 
 Burner, Arj^and, witli 
 
 i shed iron chimney. Fhuiic is udjustab 
 
 ui.d c 
 
 Glass Chimney for use with No. 22760 Burners, with clamp to attach to burner. 
 
 turned very 
 
 1.00 
 
 15 
 
 Burner, consisting of an ordinary gas jet with 12 inch stem on heavy iron ba; 
 laboratory ' 
 
 Very convenient in 
 1.00 
 
 Burner, Micro, for obtaining a small flame; 2i high, nickel plated, with long inlet tube. Very suit- 
 able for use with paraffine baths, etc 50 
 
 liurner. Micro, same as No. 22772 but with glass chimney 1.00 
 
 Burner, with circular draft; without air regulator; will not clog because of any substance falling irr 
 
 tube. Height 5 inches, diameter of tube /,; inch. 
 
 Burner, Micro, consisting of a brass tube on l:ironze ba.se with air inlet underneath, height 3 inches, 
 diameter of tube f inch. A very convenient and economical burner for the laboratory table 
 where great heat is not required .2.5 
 
 Burner, Eunsen, low form. Height 3 inches diameter of tube -^ inch 
 
 " low fonii. same as No. 227SG but larger and heavier. Height 4^ inches. 
 Piameter of tube I | | 
 
 Each ].3(i 1 ..>(! | .7 
 
 2278S. 
 22792. 
 2279G. 
 22800. 
 
 22804. 
 22808. 
 22812. 
 22S16. 
 
 Burner, Jiunseu, 
 
 1 two tube-^ . 
 three " .. 
 four " 
 
 1.25 
 1.50 
 2.00 
 2.75 
 2.00 
 
 Burner, 
 
 fl; 
 
 " three tubes m si ruighl line 
 
 •' four " ■' ■' ■' 2.40 
 
 " " " " " with individual stopcocks 4.50 
 
 Bunscn, willi [ii(|uered brass air regulator. This is a superior burner to the ordinary Bunsen 
 both construction and finish. Height 6 indies, diameter of tube. ^ inch 25 
 
 Bunsen, .s.Tnic construction as No. 22S16 but with lube '> inch in ilianieter siiviim a much larger 
 
 imc 40 
 
 Bunsen, uilh pilot fhiiite and sto|ir(K>k 2.00 
 
ARTHUR H, THOMAS COMPANY 
 
 22856. 
 22840. 
 
 22844. 
 
 22848. 
 22852. 
 
 22860. 
 
 122864. 
 
 Burner, Uunseii, unproved low form .75 
 
 Burner, Bunsen, improved form with gas regulator in addition to air regulator. ISuperiur to the ordi- 
 nary Bunsen in that perfect combustions may be had at all times. Height 6 inches, diameter 
 of tube ^ inch. . ". 1.15 
 
 Burner, Bunsen, Royal Berlin Porcelain, with air regulator 2.0O 
 
 " " " " as above, with porcelain chimney as shown in illustration. 3.50 
 Extra Porcelain Burner Tube .50 
 
 Burner, Adjustable, improved form, with regulators for both gas and air, for either coal or gasoline 
 
 gas. Height 65 inches, diameter of tube 5 inch 1.25 
 
 same as N0.22S56 but without base. Fitted with thread 1.15 
 
 Burner. Oetroil, suitable for either gasoline gas or coal gas. Height 6 inches, diameter ' inch . 1.00 
 
 
 22880. 
 22884. 
 
 Burner, Acet.vlenc, designed especially for arctylcnr gay and not suitable for use witli rillier i;oal or 
 iiayolint- gas. Height 6 ini'h'^-^ .liruii^'i'T nf tube, ts inches 1.50 
 
 iturner, Boyce Adjustable, suitahli' l^r ■-i' il ■><■ Nnsoline gas; with separate regulators for gas and air 
 supply. A popular, low piir-. l.| i i.|. I lurner giving great satisfaction 75 
 
 Burner, Boyce Acme Safety, for iiii..r ..:.. gasoline gas, with regulator for both gas and air. 
 
 fiives perfect combustions with higli ur low flame and can not strike back under any circum- 
 stances. A very satisfactory burner 1 .50 
 
 Burner, Adjustable, for burning any kind of gas. Works very well with gasoline gas 1.25 
 
 Burner, Tirrill, made entirely of brass, for use with either coal or gasoline gas. Adjustable for both 
 gas and air. A very satisfactory burner 1.00 
 
 Burner, Universal, adjustable for gas and air. Works well with either acetylene, natural, coal or gaso- 
 lii'' Kas 1.00 
 
 :2.s02. Burner, Chadd- 
 
 reguhun, 
 rbro,- iisbr 
 
 III, rion-corrodible and durable burner. 
 ided for use where metallic burners 
 Mi.se of corrosion. Complete with air 
 lor dishes, chimnev for triangle and 
 2.00 
 
2.00 
 
 ith brass 
 
 Hurner, Teclu, with regulator for gas and air, gives a large and powerful flame. 
 
 Height, inches i> 
 
 Diameter of tube, inches i 
 
 Each 1.25 
 
 Burner, Fletcher Safety, of brass with gauze top to prevent striking back. Corn|)lete \\ 
 
 base. Height, inches 4J ■">i ' 
 
 I )iameter at top, inches i It l2_ 
 
 Each 2.15 2.60 3.10 
 
 Burner, High Temperature, a new burner of the grid top type with gas and air regulation. Equal in 
 
 performance to any burner of this type. Diameter of top, inches __i 
 
 Each 1.00 1.50 
 
 Burner, Quadruple, High Temperature, consisting of four high temperature burners as above 
 on base with supply pipe 
 
 Burner, Sargent's High Temperature, a burner nf the grid type, with adjustment for gat 
 with large tube and grid toj). 
 
 Diameter of grid top, inches I 1 
 
 Each,. I. no 1.50 
 
 No. 22fl2S 
 
 2251(i. Burner, Scimatco Patent. Constructed upon the Mcker principle with a metal grid I inch deep at 
 top. Adjustable for both gas and air and can be used with any kind of gas. 
 
 Diameter of fiame, mm '2o 30 
 
 Each 2.10 2.50 
 
 Bl'RNEKS, BLUE FLAME, for high temperatures with great economy of gas. This is the latest development 
 of the grid top type of burner, giving greatly increased heating power and an absolutely homogeneous 
 fiame, all of which is available for heating from the top of the burner to the extreme point. The gas 
 regulating device permits its use with any quality of gas delivered at any pressure and permits regu- 
 lation from the maximum to the smallest flame without back-firing. This burner is supplied in five 
 sizes am! also on adjustable support and with blast attachmiMit. With lilast attachment a (.emper- 
 ature exceeding IVOO^C is obtained. 
 22il2l>. Burner, Blue Flame, as above described. 
 
 Diameter of grid top, mm I'J 22 'Si 'dl 43 
 
 Each 1.00 1.60 2.00 2.50 4.00 
 
 22924. Burner, Blue Flame, as above, but with patent universal jninl- for maintaining the burner in vertical, 
 horizontal or inclined position. 
 
 Diameter of grid top, mm , Ill -5 
 
 Each 3.00 4.00 
 
 22928. Burner, Blue Flame, as above, with blast attachment. 
 
 Diameter of grid top, mm 22 31 43 
 
 Each 2.50 3. SO 5.00 
 
22932. 
 22936. 
 22940. 
 
 22948. 
 22952. 
 22956. 
 22960. 
 22964. 
 22968. 
 
 22972. 
 22976. 
 
 22980. 
 22984. 
 
 Burner, Eureka, self-lighting, height 6i inches, diameter of flame tabc j inch 2-00 
 
 Burner, Greenman, for use with the Greenman Thermo-regulator 9.00 
 
 Burner, Quadruple, for combustion tubes, each burner with air regulator, stopcock and wing tip, with 
 
 adjustable support for the combustion tube 7.50 
 
 Burner, Bunsen Ring Form. Fnr use on apparatus support for heating funnels, flasks, etc. With air 
 
 nf I 
 
 in{'ii(.'s. 
 
 Burner Attachments 
 
 Support, fuik shaped, for attaching to support. To hold Bunsei. _ 
 
 Crown Top for Burners, giving round flame, yuitable for heating small dishes 40 
 
 Gauze Top for Burners, giving large round flame 25 
 
 Wing Top for Burners, giving a broad fiat flame very suitable for bending glass tubing 10 
 
 Blowpipe Tip for Burners, giving a flat flame, with rest for blowpipe 15 
 
 Tripod for Burners, for supporting small dishes, etc., directly over flame. 
 
 ^i^'^' Small L;.rge 
 
 Each 15 .20 
 
 Tube for Burners, to fit inside of the burner for giving vellow flame for blowpiping .15 
 
 Star for Burners, to support chimney, etc " 20 
 
 Chimney nf metal, for use on burners in connection with star Xo. 22076 10 
 
 <>! iron, with support attached 40 
 
 -1"^"^ 
 
 m m <§> 
 
 flip 
 
 22988. Guard for Burners, uf vitrilled (.-arthenware, inciios high, s lueh^s di^iDtU'i :il buitum arul :, itu'lies 
 diameter at top, Piotects the flame from drafts and fornix ;i rigid noii-corrosive support. .3.5 
 
 22992. Burner, Bunsen Blast, with separate cocks for blast and gas supply. 'J"hc blast is directed at the 
 mouth of the burner by a small tube which aids as a powerful blowpipe. Can be used as an ordi- 
 nary Bunsen burner and blast turned on only when desired. Height 6] inches 3.50 
 
 22996. Burner, Bunsen Blast, for use with gas and air pressure, new pattern. On adjustable stand with 
 separate cocks for blast and gas, and with three tips 3.50 
 
 2,3000. Burner, Bunsen Blast, improved form, extra large size for use witli gas and air blast. On adjustable 
 sland with two tips g.Ofl 
 
ARTHUR H. THOMAS COMPANY 
 
 23004 
 
 23008 
 
 23020. 
 23024. 
 
 23036. 
 23040. 
 23044. 
 23048. 
 
 pressur 
 
 Burner, Compound Blast. An improved Burner of the Fletcher type, furnishing a flame from a finely 
 pointed jet to a large powerful blast. One lever adjusts air and gas automatically. With pilot 
 light 10.00 
 
 Burner, Barthel, Automatic, for benzene. Burns 90 minutes with full flame on one charge. Will 
 melt copper wire 3 mm in diameter in 45 seconds. Use benzene from sp. gr. 0.67 to 0.71 4.50 
 
 Burner. Barthel, Automatic, for benzene, on tilting mount. Burns two hours with full flame on one 
 charge. Melts copper wire 4 mm diam. in 1^ minutes. Flame may be placed at any angle. Very 
 convenient for bending glass tubing, etc., in the laboratory. Use oenzene of sp. gr. 0.67 to 
 (1.71 8.00 
 
 Burner, Barthel Automatic, for alcohol. Burns 90 minutes with blue, smokeless flame on one charge. 
 Melts copper wire 3 mm diameter in I5 minutes _. ._ 4.00 
 
 Burner, Barthel Automatic, for alcohol. Produces a perfectly blue flame without smoking some- 
 what hotter than the flames of ordinary gas burners. Considered the best alcohol burner made. 
 Price includes burner, 5 ft. of metallic tubing and reservoir. 
 
 ISize Small Medium Large. 
 
 Each 6.00 8.50 10.00 
 
 Burner, Barthel Automatic, for benzene. A blast burner with perfect combustion giving a tempera- 
 ture of about 1400° C. This burner is smokeless and odorless and absolutely safe. Used with 
 flame tubes of three sizes producing a benzene blast or cooking flame. Regularly furnished with 
 
 medium size flame tube — 21 mm diameter 7.50 
 
 Extra Flame Tubes for No. 23028 Burner. Number J_ 2 4 
 
 Each 50 " " .70 1.00 
 
 Rose Top Burner for No. 4 Tube 1.00 
 
 Wing Top Burner to fit any size tube 25 
 
 Burner, Barthel Automatic, for Benzene, as above but with metallic force pump and pressure gauge. 9.50 
 Burner, Blast, for gasoline. With flame adjustable from very small to five or six inches. Will burn 
 about 1\ hours at full blast on one charge. With swivel burner and removable tripod. Reser- 
 voir 3^ X 4 inches, capacity 1 pint. Nickel plated 4.75 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 2Mr>C-. 
 
 Burner, Blast, with two darting needle jioint flaoies, for sealing vuds, aiupuules, serum tubes, tstu. Od 
 heavy base with adjustment for gas and air and for use with flame in vertical position. . . . 6.00 
 
 Hurner, Blast, Thiiringian glass-blower's model, with ball bearing socket, on heavy base, all parts^hard 
 soldered, with gas tube of 7 mm * 3.50 
 
 Burner, Blast, Janus Improved, as used in the German glass blowing industry for making stopcocks, 
 Roentgen tubes, etc. A very practical blast burner for chemical laboratories as by a simple 
 turn either a thin needle pointed flame or a large roaring flame of varying sizes, is obtained. 
 Each burner tube has independent regulation for gas and air and one may be operated inde- 
 pendently of the other. Diameter of large tube 7 mm, of small tube 5 mm 10.00 
 
 Burner, Blast, double tube, with foot blower. A new form designed particularly for the sealing of 
 vials, ampoules and tubes containing various biological products where instantaneous sealing 
 is important. The ordinary blast buriier is unsatisfactory for this purpose because of the im- 
 proper shape and size of the flame and its unsteadiness, noise and great consumption of gas and 
 air. This new burner has two darting needle point flames which meet and form one blade shaped 
 flame which instantly seals small tubes. By regulation of the gas and air this blade shaped flame 
 can be retained at any desired length. In sealing 1 cc ampoules only | cu. ft. of gas per hour is 
 required. The use of this burner permits the sealing of the ampoules so quickly that no heat 
 reaches the contents, an important feature where the vial or ampoule contains camphor, ether 
 or concentrated solutions easily carbonized or with chemicals of a low boiling point such as ether, 
 ethyl chloride, etc. \¥ith small foot blower and bulb as shown in illustration 10.00 
 
 Hurner Blast onlv is above without blower or bulb 5.OO 
 
 N*. 230J2 Nb. 2307(> 
 
 Burner, Evaporating, of cast iron. Very convenient for. heating glass and porcelain vessels as no cold 
 
 air can reach the hot part of the dish. Flames are blue and smokeless 
 
 Diameter, inches 4 5 qi 
 
 Each 1.00 1.25 " XOO 
 
 Burner, Evaporating, same as No. 23072 but made of solid copper with lap joi nts joined without solder. 
 
 Diameter, inches 4 5 gi 
 
 •^a«h "1 .50" 2:00"^ 2:50 
 
23080. Burner, Dangler, t'ur gasoline. Lnilor ordinary pressure a temperature i>f 1100' I . is obtained. Com- 
 plete with copper reservoir 8.00 
 
 23084. Burner, Hydro Carbon, burning vaporized kerosene which is automatically generated as fast as needed 
 from ordinary kerosene; gives a hot blue flame without smoke or smell; height 8| inches, diam- 
 eter of base 9 inches. Without stand as shown in illustration 4.00' 
 
 23088. Stand, for above burner, with top 8? inches in diameter 50- 
 
 23092, Burner, Alcohol, of brass, nickel plated; guaranteed to be smokeless, odorless and safe: will boil 
 1 quart of water in S minutes; dimension.^ 45- x 4t x S inches ... . . 1.00 
 
 N«. liWif. No 23104 No. 23108 
 
 23096. Burner, Gas, ;3j inches high, (j muhcs m diLimeter. For ordinary or gasoline ga.s. Please specify in 
 
 ordering 60 
 
 23104. Burners, Gas, of cast iron, low form, 4^ inches high, fitted with double burner. 
 
 Diameter, inches 6i 1\ SJ 
 
 Each 1.00 1.15 l^SS 
 
 23108. Burner, Gas, with two radial burners and rings set flush with smooth top. Dimension,? of top 
 
 Hi X 21 inches. For ordinary or gasoline gas- Please specify in ordering 3.00 
 
 Burner, Fletcher Radial. Made entirely of annealed cast iron, giving a solid flame when in use with- 
 out tendency to run to a point in the center. Convenient for general laboratory work. 
 
 Diameter, inches 3a 5 
 
 Each 1.50 "2:00 
 
 Burner, same as No. 23112 but with cap-nut regulator. For use with gasoline gas. 
 
 Diameter, inches 33 5 
 
 Each 1.80 2^ 
 
 Burner, Low Form, extra large, with gauze top; height 5 inches, diameter of gauze 2\ inches, length 14 
 inches. A very powerful burner 2.00 
 
 Burner, for Low Temperatures, adjustable from a gentle current of warm air to a clear red heat, dis- 
 pensing with the use of sand baths, water baths, etc., and well adapted for drying, evaporating, 
 boiling, etc. For very low temperatures the ring must be lighted through opening "B." 
 
 Style Without Blast Pip e " C" With Blast Pipe "0" 
 
 Each 1.7.5 2.00 
 
RTHUR H. THOMAS CO M P A N Y 
 
 Burner Flftcher s Solid Flame Will boil quickly four or tive gallons of water or keep a. sinali vessel 
 boiling steadily by simply turning the gas low. 
 
 Diameter of flame surface, inches 3^ 4J 
 
 Each 1.00 2.00 
 
 Burner, same as No. 23128 but with cap-nut regulator. For use with gasoline gas. 
 
 Diameter of flame surface, inches :jf ^i 
 
 Each - !.30 2.30 
 
 Extra Perforated Copper Cap for use with Burners No. 3312S and No. 23132. 
 
 Diameter, inches -i'i 4^ 
 
 Each 30 .3.5 
 
 Burners, Koch Safety. With automatic stopcock to close off the gas when flame is extinguisheil. *)f 
 improved construction with spring control and very superior to those in general use. With 
 threaded inlet for attachment of flexible metallic tubing. 
 
 Height, inches *) li 
 
 Diameter of tube, inches tt, is 
 
 Each .1.00 
 
 Burners, Koch Safety. Same as No. 231-±() but adjustable for height. 
 
 Height, inches '» 
 
 Adjustab'e to, inches 13 
 
 Each 7.50 
 
 Burner. Eoch Safety, with weight instead of spring release. On a stand providing both horizontal 
 and vertical adjustment; with mica chimney to protect flame from drafts. Very superior in 
 operation to the imported article of same description and made here because of dissatisfaction 
 with those of foreign make 10.00 
 
 Burner, Koch Safety, same as No. 23148 but with two burners. Complete on adjustable stand and 
 with two mica chimneys 17.50 
 
 Flexible Copper Tubing, specially arranged to connect above Koch Burners with our American Standard 
 Incubators, Paraffine Ovens, etc. With | inch i. p. size coupling at each end which connects 
 with thread regularly supplied on burners and on the connecting tubes of our American Standard 
 Incubators 1.00 
 
 Burner, Barthel, for denatured alcohol;enamelled finish, with brass reservoir; smokeless, economical 
 and a satisfactory substitute for the gas stove in laboratory work where no gas supply is available. 
 With one burner 4.50 
 
 Burner, Barthel. siiine as above, with two burners and one brass reservoir 8.50 
 
 (>.50 
 
 ^.50 
 
ARTHUR H. THOMAS COMPANY 
 
 2316S. 
 23172. 
 23176. 
 23180. 
 23184. 
 23188. 
 
 N». 2.^ie.S No. 2:)18J No. 2^188 
 
 Calcimeter, Scheibler, for Ihe dettniiiiiatioji of carbonic acid in boneblack, etc. (.'oinplete 25.00 
 
 Bottles with special glass stopper witli tabulation 80 
 
 Rubber Caps 50 
 
 Balloons of thin rubber 65 
 
 Calcimeter, Scheibler, for the determination of carbonic acid in saturated gases, complete. . . . 32.00 
 
 Calcimeter, Scheibler-Finkener, as used for determination of carbonic acid in marble, limestone, etc. ; 
 
 complete with thermometer and barometer 28.00 
 
 tf ^ 
 
 II 
 
 JJl 
 
 t No 23191 .No. 2,1200 No. 2.120S No. 23212 No. 2,1211 
 
 Calcium Chloride Cylinder, narrow iiioiitli. on foot, with tubulature near bottom. 
 
 Height, mm 210 260 315 350 
 
 Diameter, mm 25 40 45 .50 
 
 Each 50 .60 .75 .00 
 
 Calcium Chloride Cylinder, wide mouth, on foot, with tubulature near bottom 
 
 Height, mm 210 260 315 350 
 
 Diameter, mm 25 40 45 50 
 
 Each 50" ".eo .75 M 
 
 Calcium Chloride Cylinder, with perforated glass stopper and side tubulation at top. 
 
 Height, mm 
 
 Diameter, mm 
 
 Each 
 
 Calcium Chloride Glass Support, to prevent the calcium chloride from falling into 
 
 225 
 40 
 
 23208. 
 232)2. 
 23216. 
 
 23220. 
 23224. 
 
 100 
 
 Calcium Chloride Holder, for balance cases 
 
 Calcium Chloride Drying Tube, La Motte 
 
 Calcium Chloride Tubes, straight, with one bulb. 
 
 Length, mm 
 
 Each 10 .10 
 
 Calcium Chloride Tubes, straight, with two liiilbs. Length, mm.. 100 
 
 Each 10 
 
 Calcium Chloride Tubes, with two bulbs, and inner tube to collect moisturt 
 
 Length, mm iOO 
 
 Each 15 
 
 :.1220 No, 2322* 
 
 470 
 
 75 
 
 1.90 
 
 1,90 
 
 350 
 
 50 
 
 2.25 
 
 ■ cham- 
 
 . .30 
 
 . . .75 
 
 50 
 
 200 250 
 
 .15 .20 
 
 1.50 200 
 
 .15 .20 
 
 150 200 
 
A R 1" H U R 
 
 THOMAS COMPANY 
 
 K^ ^ 
 
 T 
 
 No. 2322S N^. 2S2^2 N». 23201; > 
 
 23228. Calcium Chloride Tul)t>, T -iKipr^l. 
 
 l.rii-Tli. I ,r, luu 12.-J 
 
 Kach .1.1 .1.") .IS 
 
 232.32. ralduni (hloride Tube!., l> »hai.r.l. Mitli two side li 
 
 ■' 
 No. 2;;21l 
 
 No. 2,5 24N 
 
 200 
 
 .28 
 
 100 
 
 l^ach 1.3 
 
 23236. Calcium Chloride Tubes, Vcllhardt. «illi iwu Hii.le tubes ;ind bulb. 
 
 Each 
 
 23240. Calcium Chloride Tubes. Peligol. uith three bulb. 
 
 Each 
 23244. Calcium Chloride Tubes. vMih 
 
 l.rn-th. mm 
 
 Each 
 
 23248. Calcium Chloride Tube.i. Marchand. 
 
 I.etiirtli, mill 
 
 Each. 
 
 23252. Calcium Chloride Tubes. Schwartz, uilii ,-i.l 
 
 Length, mm 
 
 Each 
 
 1 ill nutlet tubes. 
 
 JOO 
 .3"0' 
 
 ;ited jila.ss stoppers. 
 
 #^ 
 
 „3.5 
 
 isll 
 .30 
 
 l.'jl) 
 .35 
 
 ISO 
 .60 
 
 120 
 .30 
 
 l.')0 
 .35 
 
 special slanda ior Distillint' t'iasks, Itelurts. Ue^ 
 
A R T H UR H. THOMAS COMPANY 
 
 Jo. 23300— Sectional View 
 
 CALORIMETER, PARR STANDARD. The marked features ul tlii.-; method are ^ccuraey, [siinplieity, ease 
 and rapidity of manipulation. The results are absolute and not relative. The operations are such 
 as can be carried on by one not specially skilled in laboratory processes. Oxygen under high pressure 
 or any pressure is not used. The time consumed in conducting a test on a weighed and driecf sample 
 should not exceed fifteen or twenty minutes. Sodium Peroxide is used as the combustion medium. 
 The CO; and H3O formed in the reaction are at once absorbed by the chemical giving a solid residue 
 instead of gaseous products. Tt will at once be seen that the apparatus required is simple in construc- 
 tion and easy of manipulation. 
 23.100. Calorimeter, Parr Standard, as above described complete for Electric Ignition, complete for either 
 lighting circuit or battery, with special thermometer 65-90° F. graduated to Ju° I''- with Bureau 
 of Standards certificate, 2 liter measuring flask, chemical receptacle, measuring cup, 5 inch 100 
 mesh brass sieve with bottom, chemical sufficient for fifty determinations, pinrers, ignition wires 
 
 reading lens with support, camels hair brush, etc 75.00 
 
 23.308. Reading Lens, for reading the divisions on the thermometer. This lens uses the thermometer stem for 
 its support, thereb}-^ maintainijig the same angle of vision for all points on the scale, without 
 
 support 2.00 
 
 23.310. Reading Lens, same !>,s Xo 3330S but with support 3.00 
 
 23314- Bank of Resistance, for use when igniting the charge of the Electric Ignition bomb. The 110 volt 
 outfit includes five lamp sockets, wired up in parallel together with switch and fuse block and 
 for 220 volt two lamp sockets in series and five in parallel, with same accesories. 
 ^'oltage 110 volts 220 volts 
 
 23318. 
 23322. 
 23338. 
 23346. 
 233.50. 
 233.54. 
 23358. 
 23362. 
 23366. 
 23370. 
 23374. 
 
 Each.. 
 
 Water Motor and support 
 
 Electric Motor, variable speed for i 
 Bomb, Electric Ignition, completf^ v 
 Thermometer, as .supplied with tlir 
 Special Thermometer, iri-lO.'i" F., s; 
 Accelerator, 2 oz. bottle . . . . 
 Barium Oxalate, 2 oz. bottle 
 Gaskets for bomb, per do; 
 
 5.00 
 
 5.50 
 
 j.OO 
 
 voltage must be specified 12.00 
 
 30.00 
 
 ,'„ths with B. of S. certificate 10.00 
 
 15.00 
 
 50 
 
 25 
 
 Hydrone, 2 lb. can 1.75 
 
 Special Chemical, 2 oz. bottle .75 
 
 Sodium Peroxide, a special urade. Size of ran i lb. Mb. lib. 
 
 Each 65 1.2.5 2.00 
 
ARTHUR H. THOMAS COMP ANY 
 
 alorinieter. Parr Oxygen Bomb. The new features consist of a bomb of a new acid resisting alloy 
 superior in streugth to the best tool steel and which obviates the use of anyplatinum or enamel 
 lining; the use of rubber gaskets in place of lead and a new automatic oxygen valve. Complete 
 with bomb, water container, insulating vessel with rover, stirrer and pulley, oxygen connection 
 with gauge, needle valve and couplings, octagon holder for bomb, ring support for holding calorim- 
 eter covers with thermometer spanner wrench, electric motor with variable speed, direct or 
 alternating, one-half dozen capsules of special alloy, thermometer graduated in ^V" F., with U. 
 S. Bureau of Standards certificate, reading lens and support, special ignition wire and 
 
 gaskets : 300.00 
 
 Accessories for Parr Oxygen Bomb Calorimeter. 
 
 23382. Bomb'<.nly. Of acid resisting alloy 175.00 
 
 23386. Water Container 10-00 
 
 23390. Insulating Vessel with cover, stirrer and pulley 45.00 
 
 23394. Oxygen Connection with gauge, needle valve and couplings 26.00 
 
 23398. Octagon Holder for Bomb, with spanner wrench 10.00 
 
 23402. Klectric Motor with variable speed, direct or alternating 12.00 
 
 2.3406. Special Thermometer, as regularly supplied with the outfit, 05-90° F.. graduated in t^/ F. with 
 
 r. S- Bureau of Standards certificate 10.00 
 
 23410. Reading Lens and support 3-00 
 
 23414. Ring Support for holding calorimeter covers with Iherniometer 2.00 
 
 23418. Special Ignition Wire, per card -50 
 
 23422. Large Gaskets for Bomb, per dozen 75 
 
 23426. Small Gaskets for Valve, per dozen '. .75 
 
 23430. Small Gaskets for Union, per dozen. .25 
 
 23434. Beckman's DifiTerential Thermometer, graduated to lU" C. with P. T. R. Certificate of 
 
 .Standardization 25.00 
 
 23438. Capsules (special alloy) I dozen 6.00 
 
 23442. Bench with hinged top and locking device for oxygen cylinder. Blue print for constructing 
 
 bench W'ill be sent free on request 18.00 
 
 23446. Calorimeter, Mahler Bomb, original French make, constructed under the supervision of the author. 
 A standard instrument throughout the world. With enamelled steel bomb, stirring apparatus, 
 platinum tray, etc., but without thermometer, oxygen cylinder and primary battery as shown in 
 illustration. (Price subject to variation because of platinum market). 
 
 Duty Free 248.75 Stock 300.00 
 
 23450. Thermometer, original French make for use with above, + 8 to + 19° C. in ,,',., ths 22.50 
 
 23454. Thermometer as above, + 18 to + 29° C. in ,-,'„ths 22.50 
 
 23458. Thermometer as above, + 14 to + 2.5° C 22.50 
 
(;aLORIMETER. EMERSON fuel. TMs is a calorimeter of the so-called "bomb" typt, with its esaential 
 elements of operation the same as the original Berthelot type. It, however, embodies improvements in design 
 over the older types of bomb calorimeters which tend to increase the durability of the instrument and greatly 
 facilitate its operation. 
 
 The bomb is made of steel, consisting of two cups joined by means of a heavy steel nut. The two cups are 
 machined at their contact faces with a tongue and groove, the joint bein^ made tight by means of a lead gasket 
 inserted in the groove. The lining is of sheet metal spun to fit the interior. The bomb is made up tight, with 
 a milled wrench or spanner. The pan holding the combustible is of platinum or nickel. The fuse wire should 
 be platinum in general fuel testing. In standardizing the calorimeter by means of cane sugar, benzoic acid, etc., 
 it is necessary to use iron fuse wire. 
 
 The jacket is a double walled copper tank, between the walis of which water is inserted. The calorimeter 
 bucket is made as light as possible, of sheet brass. 
 
 The stirring device consists of a paddle wheel shaft enclosed in a vertical tube to facilitate its action in 
 circulating the water. The stirrer shaft is driven by a belt from a small motor at the other end of the stirrer 
 bracket. The motor is mounted on a sliding plate which permits of a changing position of same to vary the 
 tension on the belt. This varying tension serves to regulate the speed of the paddlp shaft by thus varying the 
 speed of the motor. The stirrer is mounted on a post on the calorimeter jacket, ;is h i Ik- tliennnmeter holder. 
 The motor is driven by a 110 volt circuit and should be placed in series with ,i in ■ i. ! i i .■ If so desired, a 
 
 motor driven by a battery can be specified in ordering the apparatus. The b;H i. i i i-. driven by a six 
 
 volt storage battery. The Edison-Leland Type of battery is preferred. These iiK.ih'i - l' -lut.^il fur the 110 volt 
 power circuit may be driven on the other voltage provided that a proper resistance be placed in series so that 
 the current in the circuit is one-half ampere. The motor may be driven by either direct or alternating current. 
 
 The piping for the insertion of oxygen under pressure is made especially strong and durable. 'I he piping of 
 small internal bore is made of heavy brass. The system is fitted with a hand nipph' nf nvj' fivl fj- in;ii" Hie ''nn- 
 nection with the bomb, and the other end has a special fitting to grasp the oxvii' n '■: ■'" ' ■■' ' i ' ■ .. -.-.j-u 
 piping of the regular Emerson Calorimeter outfit is designed to fit the oxygen i-.l i I i ~ ~ 
 
 White Dental Mfg. Co. For prices see page 252. Oxygen piping to fit the oxvu'. ■! ■ ■. ir.ii.i^iil Hh' i iih. \ii- 
 Products Co. can be specified in ordering the apparatus. The oxygen piping furnish^'ii to conofct with ^. S. 
 White Company's cylinders is designed for two cylinders while that furnished to connect with the Linde .\ir 
 Product Company's cylinders (which are considerably larger) is designed for only one cylinder. Commercially 
 pure oxygen, free from all traces of combustiblf (j;:isfB -should be used. 
 
 The plate holder or vise is to be used '\ L i J ■ ''iiiLi; the nut of the bomb with the spanner. 
 
 The table with the rotating top is to !.■ ■ i ■ ! ■ !■ when the same is connected to the oxygen piping._ 
 
 The spanner or wrench is a forging wi ^i 'i ■. n 'lie and is useil to make bomb up with i^as tight joint 
 
 2.3470. 
 
 Calorimeter, Emerson Fuel, as li 
 calorimeter can, double w^lII 
 high pressure gauge, speria 
 can be supplied if desiredj 
 
 complete witli steel bomb ^ 
 j:Lcket, heavy i)iping leading 
 janner, stir]-i;r with motor : 
 ennometer holder, gaskets, 
 
 neter. 
 
 23474. Calorimeter, Emerson Fuel, same outfit as Xo. 23470 but with u:olH 1 
 
 I -I" ' l.i'l lining, 
 
 _■ I' I ']ily tank, 
 I'li'-j !■:! iri-y drive 
 ■., Kjl a niiuut ther- 
 
 180.00 
 
 \i instead of nickel. 
 
 275.00 
 
 22478. 
 
 23482. 
 23486. 
 23490. 
 23494. 
 
 Calorimeter, Emerson Fuel, same outfit as No. 23470 but wi 
 
 fluctuation of platinum) 
 
 Nickel Lining only for Emerson Fuel Calorimutcr 
 
 Motor only for Emerson Fuel Calorimeter 
 
 Thermometer, Beckniann, Goetze make, range .^° to 6° C. 
 
 Thermometer, as 
 
 ■ith P. 
 
 liiiiii";: ( Price subject to market 
 
 490.00 
 
 12.00 
 
 8.00 
 
 , without certificate . 
 
 . R. certificate 25.00 
 
CALORIMETER, RICHE IMPROVED ADIABATIC, designed for use in all branches of caloriiiietrie work, i.e., 
 the presence of heat power in coal, food or other commercial products the values of which are mate- 
 rially altered by impurities. The bomb is of theKrocker type, provided with two outlets so that carbon 
 determinations can be made. The bomb is supported by a hinged ring which is raised and lowered without 
 touching the fingers in the water. The water jacket for the bomb consists of a vacuum cup which insures 
 both isolation and insulation. The stirrer is of the screw propeller type and the rods are insulated by 
 passing through hard rubber with a hardrubber capscrewed oneachend. The vacuum cup containing 
 the water is surrounded by an oak box lined with one inch pressed cork glued to the wood. On the cover, 
 in addition to the cork is glued apiece of hair feltone-half inch thick, effecting a tight joint with the 
 top of the vacuum cup. Ignition of the substance in the bomb is accomplished by a current from three 
 2-volt storage cells. The current first passes through a 3-ampere fuse wire in series with a platinum 
 wire within the bomb itself. The platinum wire is connected with the substance to be burned by 
 means of a linen thread of sufficient size to secure ignition. In making combustions, the substance to 
 be burned is prepared, weighed and placed in the bomb, which, after being charged with 30 to 40 atmos- 
 pheres of oxygen, is then placed in the split ring and the wires connected. The water in the vacuum 
 cup is brought to any temperature within + or — 5° of the room temperature. The thermometer is 
 adjusted and the motor started. Readings are then taken until the temperature of the water becomes 
 constant. The sample is then ignited by closing the switch and the readings are taken. The heat 
 absorption is complete when the thermometer shows a constant temperature for three successive min- 
 utes. When the bomb is removed and opened and rinsed with water, the rinsings are titrated with 
 ^, alkali for nitric acid, using litmus as an indicator. This calorimeter may be used with any of the 
 staniiard bombs now in use. See Journnl of Ific Amrrican Chemical Society, November, !9lS. 
 
 23500- Calorimeter, Richc Improved .4diabalic, cuNiiilitf with thermometer 225.00 
 
 23504. " " ■■ " " without therinonieter 215.00 
 
 23508. ■■ " " ■' ■' " ■' or gauge 210.00 
 
 23512. " " " " ■' " " gauge or accessories 150.00 
 
ARTHUR II. THOMAS COMPAN Y 
 
 l.pcds and Nurlhrup Plalinum KfsisUnco falurim.-l. 
 
 Scale in Connirtion Hith Emerson Fuel CalorimeCcr. 
 
 CALORIMETER THERMOMETER, LEEDS & NORTHRUP, Platinum Resistance, Bureau of Standards Type. 
 
 A platinum resistance thermometer designed to secure an accuracy greater than cun be obtained with 
 a mercury thermometer. It is sensitive to temperature changes of .0003°C. or .OOOS°C. and, there- 
 fore, the temperature interval can be read to an accuracy about ten times as great as is possible with 
 mercury thermometers. The bulb of the resistance thermometer is more robust than is a mercury 
 thermometer and is also much quicker in responding to changes in temperature. Its knife-like form, 
 which gives it a maximum ■ ■!" .-'i]-r:r'i' \'. iMi ;i miTj I'j.n -■'' a ■ .'i.!.!!-' -■'-,■' ti ■'■-;"■■ (■■lin ii'. tc- then i'.[-i"tcr 
 
 lag. Its range of measurfiu' . .■!. I i I ■ i i .■ i ..■!. 'i. | ■■ ■ ii ■ ■! :■ i , i !■ ' .1 ■':.,!■ i ■■ ■,. . 1 ■ ' \<e 
 
 electrical method of readm- 1 ■ I-' ■■■ ■ i n ■ ■: > ■ ■' ■! n. j'_ 1 ..■' ■ ..i ■ 1 ■ i- 1 ! . ■ .-!i . in^ ■ m- 
 
 lierature curves. See ■''_'<;/.'.■■■ ■■■.' ■.■ ■■■ '.'< ■ '■'■■■■' /■.'.■■■ " ■■'■■". ' ■■ /-■,..'.■■■;,> /■ '■ /-.'■ /■■! m '■ I ■'■■.■-'■ f ;. 
 
 23.520. Thermometer Outfit, as above, sensitive lo .OUOo°(J., consisting of Reading Bridge, uncertified Resist- 
 ance Bulb, High Sensitivitv Galvanometer, Lamp and Scale, but without Calorimeter. . . 355.00 
 
 23524. Reading Bridge '. 200.00 
 
 23528. Resistance Bulb, uncertified 40.00 
 
 23532. '■ " with certificate of the Bureau of Standards 50.00 
 
 23536. High Sensitivity Galvanometer 90-OO 
 
 23540. Lamp and Scale 25.00 
 
 23544. Thermometer Outfit, as above, sensitive to .0008°C.. consisting of Reading Bridge, uncertified Resist- 
 ance Bolb, and Galvanometer with Telescope and Stale, hut without Calorimeter 244.00 
 
 23548. Reading Bridge 150.00 
 
 23552. Galvanometer, with Telescope and Scale 54.00 
 
 < 'aloniiietcr Thermometers as above described are urtcd by: 
 
 U. S. Bureau of Standards Armour Inslitule 
 
 U. S. Bureau of Mines Harvard University 
 
 U.S. Department of Agriculture, Nutrition I.aboralory Cornell University Medical College 
 
 U. S. Naval Eiperiment Slalion Pennsylvania Stale ColleKe 
 
 City of St. Louis Ohio Stale Universily 
 
 University of Illinois University of Ciiili 
 
 Jdhns Hopkins University Ottawa Department of Mines 
 
 MflS.sachuseds Institute ol' Technology Elc. Etc. 
 
 CALORIMETER, ATWATER BOMB, widelv used in determiaing the heating value of feeding stuffs, foods, the 
 adulteration of fats and oils, in addition to coal woik. See Journal of the American Chemical Society, 
 Vol. XX r; No. 7, July. 1903. The Atwater Bomb Calorimeter can be furnished with complete plati- 
 num bomb, at an extra price which must be quoted on application. The regular outfit consists of the 
 
 Bomb, with rolled gold plated copper hiiiug for ■ikell .ind mtb top nickel lititd and nickel aupporis complete with one doi- 
 
 en nickel capsules (three sizes^ too.i. iguition mre ejakcfj etc to- use mth boml 150 OO 
 
 Clamp, for holding bomb with spanner ]» ^ 
 
 Support, for holding bomb while rhaneing manometer and conrjections 'o «« 
 
 Pellet Press and Mold, complet* , , , „^ 1>» 
 
 Calorimeter Cylinders, complete nith «<iter holder atirrer, thermometer aupl ort and electrical couneclions ^5 Utt 
 
 Direct Current Motor, with speed reducing gear 2U OO 
 
 Alternating Current Motor, with sfetJ reduong EPir ^^ »^ 
 
 Thermometer Reading Glass f ™ 
 
 Electric Tapper, lor use with llierri ci ete (tmi let. «itb I att^rriL 1.11-I1I iitton and wire 5 00 
 
 23560. Complete Outfit, consi-sling of thf d..i\( without th( rinnmetfr with ilterniting ( urrent motor 264 50 
 
 235(;4, ■' ■' ii - .. . " ' diicct turrcnt motur 2b2.0O 
 
CALORIMETER, FERV THERMO- 
 
 ELECTRIC, a new applica- 
 tion of the thermo-electrif 
 couple to calorimetry, ^jro- 
 viding the following distinct 
 advantages in the determi- 
 nation of calorific power; — 
 Direct reading in calories on 
 
 millivoltmeter scale. 
 Omission of water jacket, 
 the steel bomb itself con- 
 stituting the calorimetric 
 mass. 
 Omission of mercurial ther- 
 mometer with its attend- 
 ant difficulty in reading;. 
 Rapidity of determinations, i. 
 e., 15 minutes. 
 
 The bomb proper con- 
 sists of a steel cylinder linei^i 
 inside with nickel to prevent 
 oxidation and surrounded mi 
 the outside with a rlnsr- 
 fitting copper jacket •'!)." 
 The bomb is supported in an 
 outside copper cylinder "A" 
 by means of eonstantan disc 
 *'E." When the millivolt- 
 meter is connected as shown, 
 the steel bomb, the eon- 
 stantan disc ^nfl the outside copper jacket constitute a copper-cdustantau thermoelectric couple 
 with (111' Imi[ i.iiii i.ion at the point where the eonstantan disc "E" is joined to the steel bomb and 
 
 the i/'iM I'lh ;it the point where the eonstantan disc is attached to the outside copper jacket. 
 
 Expi'i iii-i III ,1. ill' liritish National Physical Laboratory and at the Laboratoire National des Arts 
 et Mctiery. ol i'r;un:e, have shown that with a comparatively constant weight of sample and a uniform 
 oxygen pressure in the bomb the elevation of temperature is projiortionate to the calories released in 
 the bomb divided by the weight of the sample in grams and that in a long series of tests the error in 
 readings on benzoic acid were found to be considerably less than 1%. As the needle of the millivolt- 
 meter remains at the point of maximum deviation for about 15 seconds, the readings can be taken with 
 great accuracy. The ignition is accomplished by a hot wire heated by an accumulator of 60 ampere- 
 hour capacity at 4 volts or by a magneto. See G4nie Civil du 25 Mai 1912. 
 23568. Calorimeter, Fery Thermo-electric, with bomb, copper jacket and millivoltmeter. 
 
 Duty Free 193.75 Duty Paid 232.50 
 
 23572. Calorimeter, Fery Thermo-electric, as above with certificate of the Laboratoire National des Arts et 
 M/'tiers. 
 
 Duty Free 200.00 
 
 Manometer, for automatically controlling constant ] 
 
 Duty Free 18.75 
 
 Pastille Press, with moulds. 
 
 Duty Free 15.00 
 
 Accumulator, 4 volt, 60 ampere-hours. 
 
 Duty Free 11.2.'i 
 
 Ignition Magnets, tn be used in place of the Accunnd; 
 
 Duty Free 16.25 
 
 106 
 
 Duty Paid 240.00 
 
 of the Oxygen, 
 Duty Paid 22.50 
 
 Duty Paid 18.00 
 
 Duly Paid 13.50 
 
 Duty Paid 19.50 
 
23600. 
 23604. 
 23608. 
 23612. 
 23616. 
 23620. 
 
 23592. Calorimeter lor Gas. Parr. In I.Ium iiisti-uiiient liu.ve been eliminated the nuiiii Hource« of errur, 
 i.e., tlie Mietciing uf ga«, the riidiation of heat, the variations due to the differences in the 
 humidity of the air, the uncertainty as to the quantity of air used, the incompleteness of 
 combustion and the inaccuracy of the numerous thermometric readings which are necessary. 
 Determination is based upon the burning of a standard gas of known composition and heat value 
 on one side and the unknown gas on the other, in such a manner that equal volumes under equal 
 pressures and equal temperatures may be made to impart their heat to equal volumes of water. 
 The heat values are, therefore, in direct proportion to the temperature readings of the two ther- 
 mometers and the metering of gas thus avoided. See Journal of Indusiriai and Engineering 
 Chemistry, August, 1910. Complete, including generator for standard gas, electric motor for 
 driving the apparatus, thermometers, reading lens, pilot lamps, gravity tank, one 2 lb. can of 
 Hydrone and instruction book 275.00 
 
 CALORIMETER, SARGENT AUTOMATIC GAS, for determining the calorific value and the dust, tar, mois- 
 ture and Holid matter in commercial and inflammable gases. The Calorimeter consists of a wet test 
 meter in which the gas consumed is accurately measured. From this meter it flows to a governor which 
 maintains a uniform pressure of the gas at the burner. In the calorimeter proper the accurately 
 measured gas is burned and its calorific value is manifested in the rise of temperature of measured 
 quantities of water flowing through. From the calorimeter proper the heated water for each unit of 
 gas burned is automatically discharged into one of the pails in which it is weighed on the decimal 
 scales. The pounds of water, times its rise in temperature in degrees Fahrenheit, times the quantity 
 of gas in cubic feet consumed, gives the B. t. u. direct. The complete outfit consists of the follow- 
 ing equipment, only one pair of thermometers, of course, being necessary. 
 
 23.'i96. Calorimeter Body with automatic attachment, Bunsen burner, tubing, exhaust thermometer and 
 
 beaker 100.00 
 
 Two Thermometers, inlet and outlet. Graduated to ^''. For ordinary work 16.00 
 
 Two Thermometers, Precision, inlet and outlet, with certification. Graduated to ^,° 30.00 
 
 Wet Pressure Governor with weights 15.00 
 
 Wet Test Gas Meter with all attachments 52.50 
 
 Scales, special, 10 lbs. weighing to y^^ lb 12.00 
 
 Two Weighing Pails, Balanced and nickeled 5.00 
 
T H O M 
 
 ilh No, 23G2Sand Nu. 
 
 CALORIMETER, JUNKERS GAS, fur conliimuus comljustious, to determine quiekly and exactly the lieiitiiig 
 value of f^atiea and liquid fuels. For gas works, gas consumers, laboratories, manufacturers of gas 
 motors, establishments using gas motors, etc. The heat developed from a constantly burning flame is 
 entirely transmitted to an even flowing stream of water. This is the standard gas calorimeter througb- 
 oul tlic (.-ivilized world. A galvanometer or miHivoltmn n a- iv-iil:nly n-^i-d with Thermocouple 
 ryi'ojiictiT.-; call, with slight alteration, be used in taking (In' if-.nlnn;- i.i, lln- instrument. 
 23624. Calorimeter. Junkers Patent Gas, including two thermnnni ii - n ,",ii • . ir ,'„(lis, readinjr lens, neces- 
 sary lubher stoppersj tubing, graduated cylinders, i u ,, in (juii.:lnd ka.-r. 
 
 Duty Free 115.00 ' Stock 136.00 
 
 2.5ft28. Gas Meter, .3 liters, for use with above for rich gases, with two thermometers 0-50° C. in sJTifile degree 
 divisions, [ueasuring cylinders and case. 
 
 Duty Free 36.30 Stock 45.U0 
 
 23632. Gas Pressure Regulator, for above, with extra valve and case. 
 
 Duty Free 14.85 Stock 18.00 
 
 Note— The above three units constitute a complete outfit and are furnished at the sum of the prices, 
 i.e., duty free at $166.15 and from stock at $199.00 
 23636. Gas Meter, for 10 liters, for pure gases, in case. 
 
 Duty Free 43.00 Dut> Paid .52.00 
 
 23640. Accessory Outfit for Liquid Fuels, consisting of precision balance, burners, etc., in case 
 
 Duty Free 36.30 Duty Paid, 45.00 
 
 23644. Thermomcler (as furnishfd with Junkers Gas Calorimeter), 0-50° C. in Ti..ths 5.00 
 
 23648. " ■< " « -i .. « o_5Q= c. in 1° 1.00 
 
ARTHUR H. THOMAS COM 
 
 i:.\l'LANAriO.N OF DIAGRAM 
 
 WATEU MKTEIE A. UAS MKTKR B. ii liicli by means of a ligiit runziinE c< 
 to keep the fL-latiou between tlie quantity o! gaa and the Quantity of w. 
 
 CALORIMETER BODY C, the arraiieement £or continuously recording the heating vali 
 off the heat developed therefrom to the titream of watercoatinuously flowing fh; 
 
 REGULATOR D. which allowa the water to flow to the plummet boi. 
 E, wtiicn provides for a regui 
 
 lally cogivtieela v 
 
 ghit 
 
 TWO GAS PRESSURE REGULATORS Fl AND F2 which keep the p 
 
 3 front 
 
 ind behind the gas u 
 
 DIFFERENTIAL THERMOMETER, with connectiona, 
 
 of which ilenotea the difference of temperature b 
 TWO CONTROL THERMOMETERS for the incoming : 
 CASE with tightly fastened conuectiou pipea, etc. 
 
 thermo-element for the product 
 ween the incoming and outfiowin 
 id outflowing water. 
 
 CALORIMETER, JUNKERS AUTOMATIC GAS, for the continuous measurement and recording of the heat 
 value of gases. For gas plants, coke ovens, blast furnaces, foundries and all other establishments pro- 
 ducing gas for light, power and heat as well as for laboratory investigations. The instrument requires 
 no measurement of water or gas, no watching of thermometers and no calculations, the calorific value 
 being continuously shown by a pointer. Readings can be made at points distant from the calorimeter 
 or at several points simultaneously from one calorimeter. 
 23652. Calorimeter, Junkers Automatic Gas, complete as above described, including calorimeter with thermo- 
 electric pile, apparatus for measuring the proportions of gas and water with supply regulator, 
 regulator for gas pressure, cupboard with glass doors and accessories and reservoir for supplying 
 water constantly to the apparatus for measuring water, but without galvanometer. 
 
 Duty Free 313.50 Stock 380.00 
 
 23656. Galvanometer, Indicating simple construction, for use v 
 
 Duty Free 49.50 
 
 23660. Galvanometer, Indicating improved construction. 
 Duty Free 66.00 
 
 23664. Galvanometer Registering, with 24-hour charts. 
 
 Duty Free 148.50 
 
 23665. Galvanometer, Registering, for continuous operation. 
 
 Duty Free 214.50 Duly Paid 260.00 
 
 I above. 
 
 Duty Paid 60.00 
 
 Duly Paid 
 
 Duty Paid 180.00 
 
2.3700. 
 23704. 
 23708. 
 23712. 
 
 23716. 
 
 23720. 
 2.3724. 
 
 23728. 
 
 
 65 
 .20 
 
 ith wc 
 
 Capacity, cc 30 
 
 Diameter, ram 50 
 
 Each .18 
 
 Casseroles, Sanitats Porcelain, trade-mark "arrow," 
 
 Capacity, cc 125 
 
 Diameter, mm 90 
 
 Each 40 
 
 Lids only for Casseroles No. 23716. 
 
 To fit size, cc 125 
 
 Each .10 
 
 Casseroles, Royal Berlin Porcelain, trade mark "scepter 
 
 Capacity, cc 30 75 150 
 
 Diameter, irmj 50 70 S5 
 
 Each 40 .50 .60 
 
 Casseroles, Royal Berlin Porcelain, trarle mark "scepter.' 
 
 Carbon Apparatus, Parr, for tile determinatioo of total carbon in coal, 
 the Parr Calorimeter. Complete with directions and tables. 
 
 Carboy Inclinator, Universal, strongly built, of iron throughout. Is shipped knocl ed I 
 assembled in a few minutes. Delivers the last drop from a carboy. 
 
 Carboy Stopper, Hard Rubber, with air inlet and soft rubber cap to fit ovei the moutl 
 
 for the convenient handling of acids 
 
 Casseroles, Sanitiits Porcelain, trade mark "arrow." with porcelain handle, without lids. 
 
 250 375 625 
 75 S5 100 110 130 
 .30 .30 .35 .55 .70 
 Dden handles but without lids. 
 
 375 
 130 
 
 375 
 
 150 
 
 .15 .20 
 
 With poreel: 
 
 110 375 
 
 95 110 
 
 625 
 140 
 .85 
 
 in handle, 
 750 
 135 
 
 1000 
 100 
 1.15 
 
 1000 
 
 .30 
 
 .'ithout lids. 
 
 1250 
 
 165 
 
 ^000 
 ..TO 
 
 90 1.65 2.10 
 
 Deep form, with wooden handle. 
 
 Capacity, cc 1050 
 
 Diameter, mm 110 
 
 Height, mm 155 
 
 Each 2.00 
 
 Casseroles, Opaque Fused Silica, shape of 23724; glazed inside and outside, with ha 
 
 Capacity, cc 30 75 150 
 
 Each Y.T5 27l5 2.65 
 
 Cement, Refractory (Vulcan Paste) Northrup. For use at the highest available temperatures 
 
 1900 
 140 
 ISO 
 
 2.90 
 
 200 
 3.40 
 
 Kile. 
 
 plied as a paste for stopping up cracks, sealing holes, as a protective covering to heating 
 wound on cylinders or, when thmned according to directions on jar, as a protecting paint, 
 very plastic and cohesive as a paste or paint, which on heating to 200° C or more, becomes 
 hard. It ia very useful in many ways for high temperature experiments in the laboratory, 
 pintjar 
 
 3.60 
 
 3230 
 170 
 205 
 
 4.40 
 
 :150 
 4.40 
 
 AP- 
 wires 
 It is 
 flinty 
 Per 
 3.25 
 
ARTHUR H. THOMAS COMPANY 
 
 CEMENT TESTING APPARATUS 
 
 23740. Aulociave Force, for Cement Boiling Test, wiLh iiiutal latk fur holding briquettey. hisidt; dimen- 
 sions, 12 X 7 inches; cover and clamps of special alloy steel; the cover is provided with a 
 steam gauge registering up to 400 lbs., and also a pop safety valve which may be set to blow off 
 at 300 lbs.; an angle relief valve is provided to relieve the pressure at the expiration of the test. 
 The cover is fastened to the cylinder of the autoclave by means of a hinged clamp made in two 
 halves; thus obviating the use of any bolts for fastening, and, ae the clamp enciri^les the entire 
 cylinder, uniform pressure is exerted at the cylinder cover and the cylinder, thus insuring an 
 absoiutely tight joint. A rack for supporting the briquettes is supplied with the apparatus which 
 
 is made most substantially and mounted on suitable support 100.00 
 
 23742. Burner, Special for Force Autoclave 5.00 
 
 23744. Cement Micrometer, for measuring the expansion of test bars subjected to the autoclave test. The 
 head is divided so that the micrometer will give positive readings, irrespective of whether the 
 test bars expand or contract during the time they are subjected to the autoclave test. The 
 micrometer head is divided so that the expansion or contraction can be measured to (B^dth of 
 
 an inch 35.00 
 
 23748. Cement Mould, of brass, for making test bars, with brass test bar which is exactly t3 inches long at 
 70° F., for use in setting the micrometer before subjecting the cement specimen to test.. . . 6.00 
 23752, Briquette Mould, new model, according to the specifications of the American Society of Civil Engi- 
 neers; by having different length rods the mold can be changed to take from 1 mould up to any 
 number desired with no possibility of individual moulds springing out of place. In gangs of 3 
 
 or more moulds, per mould 3 . 50 
 
 23756. Briquette Moulds, brass, with end clamps^ according to the specifications of the American Society 
 
 for Testing Materials 2.50 
 
 23760. Briquette Moulds, same as above but with iron, horseshoe shaped clamp 2.50 
 
 23764. Extra Clamp for Briquette Mould No. 23760 30 
 
 23768. Briquette Moulds, improved form, for shaping sections automati<-;ill\' wil.hniit rapping:, .-According 
 to the specifications of the American Societv for Testing Miitfri.ils 3.00 
 
 23772. Briquette Gang Moulds 
 
 Number of briquettes 2 3 4 .'> 6 
 
 Each 6.00 9.00 12.00 15.00 18.00 
 
 23776. Cube Mould, of bras.';, one inch, per gang 3.00 
 
 23780. " " " " two " " " 4.00 
 
ARTHUR H. THOMAS COMPANY 
 
 23796. 
 23800. 
 
 Cement Testing Machine, Fairbanks Automatic, recognized as standard. Without springs or hydraulic 
 apparatus, the action being automatic and entirely free from jars which tend to break the speci- 
 men before its [greatest efficiency has been reached. The tensile strength is generally accepted 
 as the standard, it being less difficult to obtain fair comparisons than by othfer methods. 1000 lbs. 
 capacity. Size 12 x 24 inches 110.00 
 
 Cement Testing Machine, Fairbank's Improved Automatic. This machine is exactly like the above 
 except that it is mounted on a sub-base containing a worm and worm gear connected to an axis 
 which is threaded and passes up through the base, and hand wheel by which means a steady 
 tension is applied to the briquette until broken. Recommended because" of great increase in ten- 
 sile strength of cement during recent years. Capacity 1000 lbs 160.00 
 
 CemenI Testing Machine, Olsen's New Automatic Shot form. The principal advantages of this machine 
 are as follows: 
 
 The machine is aulomatic In ils TuM capacitr and Is nal touched Troni start 1o finish or test. 
 Th« inslani the briquelte breaks, the breaking toad is read an the dial of Ihe scale. 
 The load is applied with ahsnlute smoothness, and impact from railing shot is eliminated. 
 Thecut-olTon Ihe shot kellle is practicaJly instantaneous. 
 AM shot that has escaped from the kettle has already done its work and the column of Tailing shot in the air when the specimen 
 
 breaks is, therefore weighed as it should be. 
 A new grip which brings the strain uniformly on the specimen is used. 
 
 The briquette hangs clear of the frame of the machine, giving plenty of room for (he hands when adjusting specimens. 
 This is a widely used and thoroughly satisfactory outfit; 1000 lbs. capacity, length 24 inches, 
 height 2r).T inches, weight 40 lbs '..,.., 12-5.00 
 
 Soundness Test Apparatus, Le Chatelier. A very convenient method 3.00 
 
 Cement Sampler, for obtaining fine samples of cement from the center of a barrel 7.50 
 
2380S. 
 23812. 
 23816. 
 
 23820. 
 23824. Gi 
 
 icat Needle Apparatus, Improved form. This apparatus does not require an extra compensating weight 
 to give a liownwiiiil prpssure of 300 ;;j-ains when the 1 ram needle is used (both needJes are made of 
 i;qual woijilit), thus uliviating error because of overlooking the use of the compenaating weight 
 
 with the small ncfdlf. Coniplofe with one mould 16.00 
 
 Extra Rubber Mould 2.50 
 
 Extra Glass Mould 1 .00 
 
 cat Needle Apparatus, Bram well Improved Form, v. ly convenient to determine the normal consistency 
 and time of setting of cement. Tlio i-'m -i : ii.|:^ ure of different diameters and the small needle 
 when not in use can be reversed and -i ■ 1 i n t lie body of the main plunger 20,00 
 
 ilmore Needle, for determining both the uiiiia! ami linal set of cement. Consists of a steel needle 
 ,'^ inch in diameter with a ^ lb, weight, and a needle J^ inch in diameter with a 1 lb, weight, , 4.00 
 
 ilmore Needle, .^amc a.s Xii, 23>^20but with vertical support to keep needle perpendicular to the surface 
 of the put 5.00 
 
 23828. Cement Scale, specially made to show the liueness of cement. Will weigh 1 lb. to .0001 lb. avoirdu- 
 pois 13.00 
 
 23832. Percentage Scale for fineness test, with beam divided to 10 oz, in ' oz, ; also with a second row of figures 
 readiriH from to lOO'';; fi.flO 
 
ARTHUR H. THOMAS COMPANY 
 
 23836. 
 
 2384U. 
 
 23844. 
 
 23848. 
 
 23852. 
 23856. 
 23860. 
 
 23862. 
 23864. 
 23868. 
 
 23872. 
 23876. 
 23880. 
 23884. 
 
 Volumenometer, Erdmenger-Mann, for the determination of the specific gravity of cement. A very 
 a'jciir;ilr iiietlmd, consuming much less time than the Le Chatelier, and highly recommended by 
 
 loading rcment engineers, complete with ten fiasks 35.00 
 
 Specific Gravity Apparatus, Jackson, for the true determination of the specific gravity of cement. 
 Consists of a special burette with bulb and stopcock and a special flask with ground in funnel 
 stopper of exactly the same bore as the burette. As described in the Jovrnal of the Society of Chemi- 
 cal Industry. 15 Jvne, 1901 No. 11, Vol. XXUI '. . . 6.00 
 
 Specific Gravity Bottle, Le Chatelier, as used in cement testing . 2.00 
 
 Specific Gravity Bottle, Le Chatelier, New Form, in accordance with the U. S. Bureau of Standards 
 roquirciiifnts and as used in the I'. S. Government test for Portland Cement. See Circular No. 
 
 33 of llif U. S. Bureau of Standards, without certificate 3.00 
 
 Specific Gravity Bottle, as above, but with certificate of the U. S. Bureau of Standards 5.00 
 
 Specific Gravity Bottle, Schuman, with tube graduated to 50 cc in |-'j,ths 2.50 
 
 Permeability Testing Apparatus, for determining experimentally the exact ralations between the im- 
 permeability and strength of concrete, treated by the integral method. The briquettes are 
 cylindrical in shape. 3 inches in diameter and 2 inches high. A pressure gauge is attached to the 
 main vertical tube for indicating the pressure under which the water flows. As constructed in 
 the Structural Material Testing Laboratory of the Brooklyn Polytechnic Institute. Complete 
 
 with one mould . 
 
 Extra mould 
 
 Cement Sample Cans, per dozen , 
 
 Steaming Apparatu.s, for boiling and steaming test. Made of copper; 12 x 12 x 24 inches. , 
 
 Glass Plate, for use with briquette moulds, 24 x 24 inches 
 
 Pan of galvanized iron, 24 x 24 x 3 inches deep 
 
 Brush of brass wire with wooden handle 
 
 Trowels, for making briquettes, etc 
 
 Each. 
 
 mail 
 .40 
 
 14.00 
 4.00 
 , , 1.00 
 . 30.00 
 . . 8.00 
 . , 2.00 
 .50 
 
 Large 
 .60 
 
ARTHUR H ■ THOMAS COMPANY 
 
 23900. 
 23904. 
 
 23908. 
 
 23912. 
 23916. 
 23920. 
 
 23924. 
 
 2392S. 
 23932. 
 23936. 
 23940. 
 23944. 
 23948. 
 239.52. 
 23956. 
 239G0. 
 23964. 
 23968. 
 23972. 
 23976. 
 23980. 
 
 Centrifuge. Bausch & Lomb. Hand, single speed, giving 1.200 revolutions per minute with tifty turns 
 of the handle, the latter being so constructed as to render sudden stopping impossible. Complete 
 with two-arm sedimentation attachment and one graduated and one ungraduated glass tube 7.50 
 
 Centrifuge. Bausch & Lomb, Hand, two speed, providing for speeds from 1200 to 4000 revolutions per 
 minute. Similar in construction to No. 23900. Complete with Daland's haematokrit, auto- 
 matic blood pipette, two sputum tubes and two-arm sedimentation attachment with one grad- 
 uated and one ungraduated glass tube 10.00 
 
 Centrifuge, Bausch & Lomb. Electric, with rheostat providing five different speeds of from 750 to 2100 
 revolutions per minute with two 15 cc tubes. For operation upon ordinary incandescent lamp 
 socket. Please specify voltage in ordering. Complete with two-arm sedimentation attach- 
 ment and one graduated and one ungraduated glass tube. 
 
 For Circuit 110 volts, direct 220 volts, direct 110 volts, alternating, 60 cycles 
 
 Each ■ 
 
 25.00 
 
 27.50 
 
 30.00 
 
 .\ccessories for use with any of above Centrifuge; 
 
 High Speed Indicator. , 
 Speed Indicator, automat 
 Two-arm Head, for 50 c( 
 
 tube, 50 cc 
 
 Four-arm Head, for 15 cc 
 
 tubes, 15 cc 
 
 Blood Lancet, Moore automatic 
 
 1.50 
 
 registering 3.00 
 
 tubes, with aluminum shields and one graduated and one ungraduated 
 
 4.50 
 
 ubes, with aluminum shields and one gr.aduated and three ungraduated 
 
 4.50 
 
 1.50 
 
 2.50 
 
 50 
 
 50 
 
 10 
 
 75 
 
 35 
 
 75 
 
 15 
 
 L tubes. 
 
 Haematokrit, Daland, with two percentage and two sputui 
 
 Milk Tube, for determining percentage of fats 
 
 Blood Tube, for use in Haematokrit for determining percentage of haemaglobin. 
 
 Pipette, 1 cc, for filling milk tubes 
 
 " automatic, for filling blood tubes 
 
 Glass Centrifuge Tube, graduated, 15 cc 
 
 50 cc 
 
 ungraduated, 15 cc 
 
 .50 cc 
 
 Aluminum Shield, to hold 15 cc glass tube 
 
 " " 50 cc " " 
 
 Sputum Tube, for haematokrit, ungraduated 
 
 Metallic Guard, for use with Electric Centrifuge Xo. 2.390S 
 
 .50 
 .25 
 7.50 
 
23988. 
 23992. 
 23996. 
 24000. 
 
 24002. 
 24004. 
 
 24f)08. 
 24012. 
 24016. 
 24020. 
 24024. 
 24028. 
 24032. 
 24036. 
 24040. 
 24044. 
 
 Centrifuge, Water Motor, Arthur H. Thomas Co, Special, with protected bearing which cannot become 
 rusted and from which the oil cannot become washed out by the water. For attachment to any 
 ordinary faucet by means of patent hose connections. The speed is under absolute control by 
 merely turning on or off the flow of water. Runs absolutely noiselessly and may be left going 
 constantly without attention. Each machine is furnished with necessary aluminum shields, 4 
 ft. of pressure tubing and patent hose connection for faucet. With patent hangers which support 
 the aluminum shields at the lower part of the pointed ends, which obviates stripping of the lip 
 of both aluminum and glass tubes when tubes are hung by the lip. With 2-15 cc tube holder 
 and one each plain and graduated glass tubes, 15 cc 8.00 
 
 Note, — It is assumed in listing the accessories for our Water Centrifuge that the 2-15 cc tube head with ahiminum and glass tubes 
 will be desired and it is, therefore, necessary in order to secure the price of any special outfit simply to add the price for the various 
 heads, if the 2-15 cc tulje head includt-d in the regular outfit is not desired a credit of SI. 00 io allowed when special outfits are 
 
 Accessories for Water Centrifuge. 
 
 Four-arm Head, with patent hangers, for 15 cc tubes, without shields or glass tubes 2.75 
 
 '■ ofl " •■ '■ " " " '■ 3.75 
 
 Two-arm ' " " .50 ■' '■ " '■ " '■ '' 2.75 
 
 Lactokrit. Stewart, for estimating the number of pus cells and the character of bacteria and insolu- 
 ble matter contained in milk. Complete with 20 glass tubes and stoppers 7.50 
 
 Extra Glass Tubes with rubber stoppers and nipples, for use with above. Per dozen 1.50 
 
 Rotating Metal Guard, for water centrifuge, 14 inches in diameter by 3 inches deep. The whole hood 
 rotates permitting much greater speed than the ordinary head and eliminating the danger of 
 tubes flying off during operation. 
 
 With shields for, tubes 4-15 cc 6-15 cc 8-15 cc 
 
 Each "9700 10.00 UM 
 
 Two-arm Head, Goetz, for phosphor determination in steel analysis, without tubes 7.50 
 
 Goetz Phosphorous Tube, glass, graduated and with glass stopper. , 
 
 " " " " ungraduated and without glass stopper. 
 Aluminum Shields for 15 cc glass tubes 
 
 " " " 50 cc " " 
 
 Glass Centrifuge Tube, ungraduated, 15 uc 
 
 50 cc 
 
 " " " graduated, 15 cc 
 
 " 50 cc 
 
 Speed Indicator, for Water CVntrifuge , . 
 
 1.00 
 .40 
 .25 
 .50 
 .15 
 .30 
 .35 
 
ARTHUR H. THOMAS COMP ANY 
 
 Table of Speeds with Arthur H. Thomas Company Special Water Motor Centrifuge. No. 23984. 
 
 Head 15 lbs. pressure , 20 lbs. pressure 30 lbs. pressure 40 lbs. pressure. 50 lbs. pressure i 60 lb9. pressure 
 
 2-15 cc tubes 1100 r. p. m, 11200 r. p. m.ilSOO r. p. m. 1700 r, p. m.llQOO r. p. m, 12100 r. p. m. 
 
 4-15 cc tubes S50 " 1 970 " 'l200 " 1400 " 'l550 " 1700 " 
 
 2-50 ec tubes 900 " 1050 " 1300 " 1500 " 1700 " 1900 
 
 4-50 cc tubes 750 '■ i 850 " lOSO " 1280 " 1400 " 1600 " 
 
 Centrifuge, Water, Double Jet, Martin, for high speeds. This form of centrifuge consists of a plate with 
 four radiating cliambers each having a depth sufficient to take a tube and its necessary holder 
 flush with the under surface of the plate, thus avoiding all atmospheric resistance. The plate 
 is fitted to a spindle, pivoted between an upper and lower center, and the spindle carries at its 
 lower end a small water wheel in a "well" to which are attached the nozzle or nozzles and fittings 
 for connecting with the water main and for carrying off the waste water. The upper center is 
 poised lightly to avoid friction, and is mounted in a flexible holder, thus giving the necessary 
 freedom from strain when working at high speeds. Three sizes of plates are made, carrying tubes 
 of 25 cc, 10 cc and 5 cc, respectively. The speed has been carefully measured and a rotation of 
 from 1000 to 5000 revolutions per minute can be maintained with ordinary pressure and with 
 absolute safety. Complete with four German silver tube holders and 1 dozen glass tubes. 
 
 For four tubes of 5 cc 10 cc^ 25 cc 
 
 Duty Free '34.50 34T80 44.10 
 
 Duty Paid 41.4n 41.80 52.90 
 
 Extra Glass Tubes for use with Martin Centrifuge. Capacity, cc 5 10 25 
 
 Per dozen, from stock " .90 1.10 1.35 
 
 Table of Speeds with Martin Double Jet Centrifuge 
 
 I Head Pressure In lbs. 
 
 i4- 5 cc tubes I 1200 ' 1600 2000 i 2500 3100 3400 
 
 :4-10 cc " ' 1000 1400 2200 i 2700 3100 ' 3400 
 
 '4-25 cc " I . 900 ■ 1200 I 1550 1900,2100 
 
 3700 . 4000 4300 ' 4550 4900 
 3700 3900 4100 4500 4900 
 2300 2500 2900 . 3200 3500 ' 
 
 24056. Centrifuge Electric, specially arranged for Goetz method of phosphorous determination in steel analy- 
 sis. With aluminum arm with conical aluminum Goetz tube holders and graduated, glass stop- 
 pered Goetz tubes. Size . . , 2-tube 4-tube 
 
 With rheostat for 110 volts direct current 44.00 55.00 
 
 24060. Centrifuge, Electric, as above, but with rheostat for 220 volts direct current 54.00 65.00 
 
 24012. Goetz Phosphorous Tubes of glass, graduated and with glass stopper, each 1.00 
 
 24016. " " " " " ungraduated and without glass stopper, each 40 
 
A.RTHUR H. THOMAS COMPA N Y 
 
 Heads and Tubes for Size 1 Centrifuee 
 
 CENTRIFUGES, INTERNATIONAL ELECTRIC SIZE 1, a compact, high-power centrifuge, with moderately 
 large capacity, conveniently arranged for research and routine work in bacteriological, physiological 
 and chemical laboratories of hospitals, medical schools, dairies and health departments. Made in 
 two types accordine; to speed, Tjpe A and Type B. Height 18 inches, diameter 17 inches and weight 
 about 75 lbs. With speed control rheostat and protecting case. Speeds with various heads are 
 shown in tabic. 
 
 
 Board of Health 
 
 Size 1. Type A, ducct cuircnl 3000 r.p.m. 2400 r.p.m. 3000 r.p.m. 
 
 alternating current 1900 ■' 1600 " 2800 " 
 
 Tvpe B. direct current 4000 " 3000 ■' 3000 " 
 
 alternating current :iG00 " 3000 " 3000 " 
 
 24064. Centrifuge, International Size 1, with speed control rheostat and protecting case^ but without heada 
 or tubes. 
 
 110 volta, a. c. 220 volts, a. c. 
 
 For current no Ta lla. d. c. 220 volts, d. c. 60 cycles 60 cycles 
 
 Size 1, T^-pe A 4(K0O~ 44.00 46.00 48.0'0~ 
 
 Type B 65.00 68.00 78.00 SO.OO 
 
 Accessories for Size 1 Cenlrlfujic. 
 
 The price of any de.sirt;d outtit may be had by adding the price of attachments desired to the pric« 
 of the machine as listed above. No glassware is included in price for attachments. These must be 
 added separately. 
 24072. Head, 2-tube, to carry either 2-jO cc tubes, two Gooch crucibles or tv/o Babcock bottles without cups 
 
 or tubes 3.00 
 
 24076. Trunnion cups for Gooch crucibles, each 75 
 
 24080. Hard Rubber Collars for Gooch crucibles, (Crucibles should be sent to us to be fitted.) Each.. ,90 
 
 24084. Trunnion Ring and 50 co metal tube 1.25 
 
 24092. Head, 2-tube, to carry 2-15 cc tubes, with metal tubes 3.40 
 
 24096. " 4-tube, " " 4-15 cc " " " " 7.80 
 
 24100. " 8-tube, " " 8-15 cc " " " " 13.60 
 
 24104. Combination Head, 4-tube, to carry 2-15 cc and 2-50 cc tubes, rtith metal tubes , , 8.70 
 
 24108, Head, 4-tube, to carry 4-50 cc tubes, with metal tubes 9.60 
 
 21112. " S-tube, " " 8-50 cc " " " " 17.20 
 
 241 K). Combination Head. S-tube, to carry 4-15 cc and 4-50 cc tubes, with metal tubes 16.40 
 
 24120. Trunnion Cups, fur liabfock test bottles (used in 50 cc places), each 50 
 
 24124. Board of Health Head, without tubes 10.00 
 
 24128. Head, perforated brass basket, 5 inches in diameter, with drip pan 20.00 
 
 24136. Trunnion Carriers for <Joetz tubes, each 1.75 
 
 21140. '• Cups for 200 cc bottles, each 3.00 
 
 24144. " Carriers for 150 cc Squibb funnels, each 1.75 
 
 24148. Prescription Bottles, of glass, 200 cc, per dozen 1.50 
 
 24152. Glass Centrifuge tubes, plain, 15 cc capacity, per dozen 1.35 
 
 24156. " " " " .50 cc " per dozen 1.50 
 
 24160. " " " graduated, 15 cc capacity, per dozen 4,00 
 
 24164. Board of Health Tubes, 2 cc capacity, per 100 4.75 
 
 24168. Head, 2-p!ace, for two Goetz Phosphorous Tubes, 2-150 cc Squibb's funnels or 2-200 cc bottles, 
 
 without trunnion carriers 5.00 
 
 24012. Goetz Phosphorous Tubes, of glass, graduated and withglass stopper, each 1.00 
 
 24016. " " " ■' " ungraduated and without stopper, each 40 
 
1,'entrifugc, Internalional, with Hospital Equipment, I'nc iiriiio analysis, liacLcriuhigy, serolugy, etc., 
 (.■onsisting of the following: 
 
 1 N«. 24104 Combinalion Hond carrying 2-M rr and 2-5l\ cc fi No. 241fin glass (ubes, gradualcd, 15 cc capicUr. 
 
 lubes, with sleel tubes. 1 do/.. No 241.'>li irlass lubts. SO cc. capacilr. 
 1 doi. No. 24152 glass Cubes plain, ].j n-. capacity. 
 
 „ 110 Kills, B.C. 220 Tolta a. c, 
 
 Current nil vnll.';. d. r 2211 lull^., d. c. Ii(] cycles 60 cfClCB 
 
 Size 1, Type A 53.r.(l :>7..5(l 59-50 61.50 
 
 " 1, Type B 7S..5(I SI. .5(1 91.50 93 50 
 
 Centrifuge, International, with Board of HeaKh Etinipmeiil, fn]- urine aimlysi.'^, bacieriology, serology, 
 and milk testing, consi.sting of the following: 
 
 No. 2411G Combination Head carrying 4-l.'i cc and 1-^(1 cc ' do/.. No. 211(10 glass lubes, l.i cc, <;ra<Iuatcil 
 
 tubes, with melal lubes. 1 doz. No. 241.ii; " " 50 cc capacity. 
 
 No. 24124 Board of Health Head. 2 doi. No. 24 Hit Board of Health Tubes with rubber stoppers. 
 
 4 No. 24120 Trunnion Cups for Bibcocli bottles. ) doz. No. Bahcock milk bottles. 
 
 1 doi. No. 24152 glass tubes, 15 cc, plain. 
 
 „ 110 volLs, a. c. 220 volts, a. I. 
 
 Current no rolts. d. c. lilM volts, d. r. [^[1 cycles 60 cycles 
 
 Size 1, Type A 7S.3.5 ^2.3.3 84.35 83.35 
 
 Type B 103.35 10G..3.J 116. 5 115,35 
 
 Centrifuge, International, with Board of Health and Food Laboratory Equipment, a viiy Lomplcte outfit 
 for urine analysis, bacteriology, serology, milk tt^sting, fniid analysis ami most wnrk encountered in 
 hospital or public service laboratories, consisting of the following: 
 
 No. 24100 Head carrying 8-15 cc tubes, with metal lubes. I doz. No. 24152 filass tubes, 1.5 cc, plain. 
 No. 24112 " " 8-50 cc " " " " '. doz. No, 24160 i!raduated 
 
 5 Trunnion cups for Babcock test Bottles. 1 don. No. 2415G " " 50 cc capacity 
 
 No- 24124 Board of Health Head. 2 doz. No. 24164 Board of Health tubes wilh rubbcr'stcppere. 
 
 No. 24168 Head carrying 2 Squibbs separatory funnels. i; linz. No. Babcock Milk Test Bollle!^ 
 
 2 No. 24144 Trunnion Carriers for Squibb s separatory funnel.^;. 2 Nn. .S.juibb^s .Separatory Funnels, l.W cc. 
 
 „ 100 volts, a. c. 220 volls.a. c. 
 
 Current. nOvolti= . d. c. 22n volls, d. c. «0 cycles^ tOcydes 
 
 Size 1. Type A lilS.50 112. .iO '""114.50 116.50 
 
 Type B 133..50 l.'!6.50 146. .W 14S..50 
 
 -tube, eight-lube heads. 
 
 I Cenlrifuge 
 
 CENTRIFUGE INTERNATIONAL ELECTRIC, SIZE 2, ..lesigned for larger capacity but not for higher speeds 
 than 8ize 1 niachines. Made in two types according to speed, types A and B. Height 23 inches, 
 diameter 24 inches, weight about 150 lbs. Size 2. Type A, is not niailc for iillcrnating current. 
 Speeds with various heads are shown in table. 
 
 Speeds with head 
 
 Size 2, Type A, direct current 
 
 Type B. " " 
 
 Type B alternating current 
 
 24184. Centrifuge, International Si/f 2, wilh spfcd 
 or tubes. 
 
 Current nu voUs, d. c. 
 
 Size 2. Type A (il.OO 
 
 Type B 9.5.00 
 
 8-tube, 101) cc 
 
 8-tube. Gtl cc 
 
 Board of Health 
 
 1500 r.p.m. 
 2200 " 
 2200 " 
 
 2000 r.p.m. 
 3000 " 
 3000 " 
 
 3000 r.p.m. 
 3000 " 
 3000 " 
 
 trol rhcr,.sl:,| 
 
 iiid protectinfi case 
 
 but without he 
 
 22(1 volts, d.c. 
 
 no mils. a. r. 
 r,0 cycles 
 
 220 volts, a. c. 
 S(i cycles 
 
 65.00 
 1*9.00 
 
2418g. 
 24192. 
 
 24196. 
 24200. 
 24204. 
 24208. 
 24212. 
 24216. 
 24220. 
 24224. 
 24228. 
 24232. 
 
 Accessories for Size 2 Internationxl Centrifuge. 
 
 Accessories listed under the Size 1 Centrifuge, p. 118, may also be used with the Size 2 machine 
 when desired and, in addition, the attachments of larger capacity, and for special purposes as listed 
 below. No glassware is included in price for attachments. 
 
 Head, 8-tube, carrying 100 cc, 50 cc or 15 cc tubes or Babcock bottles, without tubes 10.00 
 
 Combination Head, 8-place. carrying 2-200 ce tubes, or 2-150 cc tubes, or 2 Squibb's funnels or 2 Goetz 
 tubes, and 6-100 cc tubes, or 6-50 cc tubes or 6-15 cc tubes or 6 Babcock bottles, without cups 
 
 : tubes. 
 Head, 4-piace, carrying either 4-200 oc cups or 4^150 cc Squibbs funnels, without cups. 
 " 16-tube, carrying 16-50 cc tubes, or 16 Babcock bottles, without cups or tubes, . 
 
 Metal Tubes, 100 cc, each 
 
 Trunnion Rings, 100 cc, each 
 
 Metal Tubes, 50 cc, each 
 
 Trunnion Rings, 50 cc, each 
 
 Metal Tubes, 15 cc, each 
 
 Trunnion Rings, 15 cc, each 
 
 Glass tubes, with lip, 100 cc capacity, per dozen 
 
 Centrifuge, International, with Soil Analysis Equipment, consisting of Size 2, Type B Centrifugf 
 
 13.50 
 
 8.00 
 
 16.00 
 
 .75 
 
 . .35 
 
 . .55 
 
 . .35 
 
 . .45 
 
 .40 
 
 . 1.75 
 
 'ith 
 
 a speed of 1200 revolutions per minute, and equipped with a speed control rheostat, S-tube head. 
 
 eight 100 cc metal tubes and rubbe 
 for the bench. 
 
 I'lishions, ' gross 100 cc glass tubes and an eight tube rack 
 
 110 volts, 
 
 220 velu. a 
 
 Current no vslla. d. c. 220 volts, d. c. 60 cycles 60 cycles 
 
 Each 80.00 84.00 101.00 104.00 
 
 Centrifuge, International, with General Laboratory Outfit with special reference to bacteriological and 
 sprological work where large quantities are to be handled, consiisting of Size 2 Centrifuge with 
 speed control rheostat, 8-tube head, eight each of 100, 50 and 15 cc metal tubes and two dozen 
 each of 100 cc, 50 {?o :ind 15 cc plain glass tubes. 
 
 _ no volts, a. c. 220 volts, a. c. 
 
 Current no volts , d. c. 220 volls,^. c. fiO cycles 60 cycles 
 
 Size 2, Type A 102^00 IO6T60" 
 
 Type B 1.^6.00 140.00 13fi.0n 136.00 
 
 Note— For Size 2 Centrifuge fitted with 10- and 24-bottle Babcock lic.'ids, sc-v .Milk .\naiysi3 Appa- 
 
 latus, p. 347. 
 C'entrifuge, International with Food Analysis Equipment, consisting of No. 24192 Combination Head, 
 
 8-place, for 2 Squibb's funnels and 6-50 cc tubes, 2 Squibb's separatory funnels, 150 cc, 1 dozen 
 
 glass tubes 50 cc, j- dozen metal tubes 50 cc, 5 dozen Tnmnion Kings for 50 cc tubes, and two 
 
 carriers for Squibb's separ;*tory funnels. 
 
 Current 
 
 Size 2. Type A, . 
 
 
 92.91) 
 
 2424S. 
 24250. 
 
 24256. 
 
 24258. 
 
 Centrifuge Cyclone, with pcrloraLod drum, fur separating precipitates ai 1 s the nother 
 
 liquors. Widely used by sugar chemists for the determination of tl > el 1 s ell as pur ty 
 test. With bronze basket, 4^ inches in diameter, with crank for hand power driving, . , . 50.00 
 
 Centrifuge, Cyclone, same as above but with pulley for power driving 50.00 
 
 Hard Rubber Basket for handling of material which must not come in contact with the 
 "if't'il : 8.00 
 
 Centrifuge, Cyclone, same as above but heavier and larger, with metal basket 8 inches in diameter with 
 crank for hand power driving 100.00 
 
 Centrifuge, Cyclone, same as above but with pulley for power driving 100.00 
 
 Hard Rubber Basket for above 10.00 
 
:iA. N. Y. 
 
 t-nlrifagf. Larfje Universal, wilh inilrfninirnt drivie; lur s«iij1u;j:u';iI ;ind bLifteriijlrjy;ical work where 
 l;irnc i|ua.nUties are to be hiiiuili^il an iii separation of blood scruii]. Especially adapted for 
 centrifuging a large number of small specimens at one time with head No. 24312. The variety 
 of heads adapted for use with this machine permit its application to most lines of laboratory 
 work requiring the use of a Centrifuge of high speed and large capacity, as in steel, rubber, 
 sugar and oil analysis and the separation of crystals from their mother liquors. The prices given 
 include regular head as illustrated on next page under 24260— Regular Head with metal cups of 
 
 the capacities indicated and one dozen special heavy glass tubes an<l endlet 
 and speed indicator, but without motor. 
 
 Capacity, tubes 0-50 ec G-lOO cc 6-200 cc 6-300 ec 
 
 Revolutions per minute 3000 4000 4000 3000 
 
 Horse power required. ..,,...,... ^ 1 2 3 
 
 Centrifuge, wilhoutMolor Duly Free ~ 58^10 ~ 115.00 233.00 284^0 
 Duty Paid 67.20 132.00 267.00 32.^.00 
 ctric Motor, only for above Centrifuge, direct current, with starting rlieostat, 
 
 Hnrs<'powpr I 1 2 3 
 
 Dulv Free 75.70 115.00 178.25 228.80 
 
 Duty Paid 86.00 130.00 202.50 260.00 
 
 camels hair belt 
 
 6-400 cc 
 3000 
 
 358.00 
 410.1."i 
 
 260.00 
 295.00 
 
 6-.500 cc 
 3000 
 
 386.75 
 443.50 
 
 284.00 
 322.50 
 
 Centrifuge, Large Universal, as in No. 24260 but for different purposes as indicated by the respective 
 
 heads. The machine supplied with these heads is the smallest size of the above series, i. e., 
 
 that for 6-50 cc tubes, with the exception of heads F and H with which the centrifuge for 6-100 
 
 cc tubes is supplied. For motor prices see 24264, 
 
 Head A, with revolving sieve of hard glazed porcelain enclosed in a porcelain jacket with spout. 
 The bearings are entirely protected from the liquid. The maximum speed permitted by 
 the strength of the porcelain is about 2000 r. p. m.; diameter 140 mm. 
 
 Head B, with revolving sieve of heavily tinned copper, for separating crystals from their mother 
 liquors, etc. May be used at a speed up to 3000 r. p. m. On special order these sieves 
 may be furnished with ebonite lining, silver plating, lead lining, etc. 
 
 Head C, for the examination of rubber according to the method of Frank-Marckwald, for the 
 purpose of separating rubber and other organic compounds from the mineral filling mate- 
 rials without filtering. This outfit is supplied with two heads, one for 4 glass stoppered 
 cylindrical glasses and the other for 4 Erlenmeyer Flasks. 
 
 Head D, for sugar analysis after the method of Zimmerman, as used in the Royal Institute for 
 Sugar Testing, in Berlin; for the determination of the quantitative crystals in raw sugar, 
 the calculation of the yield, the calculation of the adherence of the syrup and the quali- 
 tative examination of sugar crystals for size, color, etc. The metallic cups are furnished 
 with two circular sieves and one felt plate. 
 
 Head E, for testing mineral oils for water, dirt, etc.; for 4^50 cc tubes, the cylindrical lower part 
 of the tube being graduated in percentages; maximum speed 3000 r. p. m. 
 
 Head F. same as Head E but for 4-100 cc tubes. 
 
 Head G, for Goetz phosphorous determination; for 4-50 cc tubes. 
 
 Head H, " " " " " 4-100 cc 
 
 Cenlrifuge. without Motor, with Head A B C D F 
 
 Duty Free 106..50 106. .50 124.10 124.10 IM. 
 
 Duly Paid 122.20 122.20 142.20 142.20 132. 
 
 F G H 
 
 17.5.00 98.10 160.00 
 I9!t..50 112.20 182.00 
 
ARTHUR H. THOMAS COMPANY 
 
 
 ^'i I '1^,"^^^^ 
 
 No 1 1 Sp H dd for ' 
 
 r V 
 
 N» 4 Hpad A 
 
 No.2l2hS HeadC 
 
 -#^ 
 
 N». 24fi2S Head B 
 
 -C_TS,r¥: 
 
 immir /^tMI i — iiiHIRSTL _— -, 
 
 lri«rii^ 
 
 ikQIIIS 
 
 No. 24268 Head C and H 
 
 No. 24268 Head E and F 
 
Accessories for the Large Universal (lentrifuge ai above. 
 
 24272. Porcelain Perforated Drum for Head A, 175 x 140 mm 18.00 
 
 24276. " outside jacket for Head A, 240 x 210 mm 24.00 
 
 24280. Glass Cylinders for He:id C, 50 cc capacity 60 
 
 24284. Metal Cups, each with two circular sieves and one felt plate, for Head D, each 1.25 
 
 24288. Felt Discs, per 100 2.50 
 
 24292. Graduated Glass Tubes, for Head E, 50 cc caparity, each 1.15 
 
 242%. '■ ' " V. 100 cc " " each 1.30 
 
 24300. " •' " " " <;, 50 n; " each 1.15 
 
 24304. " " ■' " •' II, lOUcc " each 1.13 
 
 24308. Gas Tubes, for above, each 10 
 
 24312. Special Head for Serum Work, c^Il^^isit iiijr of swinging rectangular boxes each carrying 12 or 24-10 cc 
 glass tubes, particulary recommended as an accessory to the two smaller sizes of Large Uni- 
 veisal Centrifuge. 
 
 Number of Tubes 72-10 cc 144-10 cc 
 
 Duty Free 80.00 100.00 
 
 Duty Paid 93.50 112.50 
 
 24316. Centrifuge Tubes, of heavy well-annealed glass, cylindrical, with round bottom, for use in head illus- 
 trated ibove md as ic^ularly supplied with the Universal Centrifuge. 
 
 C ipacit^ . . .■ 50 100_ 200 301) 400 500 
 
 Eich .60" .80 l.io L25 ' 1.75 2.00 
 
 '^"l 111 
 
 No. 24320 No 
 
 24320. Centrifuge, Electric, High Speed, Konig, designed especially for serological work. With heavy 
 armour plate cover and separate motor, all mounted on the same base board. A regulating 
 resistance permits the reduction of speed from the maximum of approximately 8000 revolu- 
 tions per minute to about 2000. With speed indicator as shown in illustration. Prices quoted 
 are for motors for 110 volts direct current. For motor for 220 volts direct current prices are 
 increased $5.15 duty free and S6.8.5 duty paid. For alternating circuits, both voltage and 
 number of cycles must be given and price will be quoted upon application. 
 
 Capacity. . .'. 4-15 cc tubes 6-15 c c tubes 4-3Q cc tubes 6-30 cc tubes 
 
 Duty Free 130.00 150.00 150.00 171.25 
 
 Duty Paid 157.50 182.50 182.50 207.50 
 
 24324. Special Glass Tubes for use with above centrifuge. 
 
 Capacity, cc _ ^■^_ ^ 
 
 Each 20 .40 
 
 24328. Centrifuge, Delepine 1913 Model, for independent drive, having a speed of 10000 r. p. m. with a Jight 
 load and of 3000 to 4000 r. p. m. with a heavy load. In order to secure lightness, strength and 
 absence of rusting, the rotor, buckets and tubes are made of Duralumin, an aluminum alloy 
 having the strength of steel and only one-third its weight, which Prof. Delepme has selected 
 after testing several metals and alloys and ascertained that it was capable of resisting the stress 
 to which it had to be submitted. This metal is but slightly affected by organic fluids such as 
 milk and has little action upon the bacteria. He has, therefore, designed tubes of Duralumin 
 to take the place of the glass tubes generally used. These tubes are practically indestructible 
 and, therefore, eliminate the loss of material due to breakage of the tubes, and also perinit of 
 certain adaptations which are not possible with glass. The centrifuge consists of a Duralumin 
 rotor of special shape allowing the maximum number of tubes to be used and securing, when the 
 disc or rotor is rotating rapidly, the most advantageous position of the tube in regard to equi- 
 librium and safety. For 16 tubes of 100 cc each. These tubes have flat bottoms, for standing 
 without support, and have consecutive numbers from 1 to 16 stamped upon them. Complete, 
 without motor. ,,„ „„ 
 
 Duty Free 435.75 Duty Paid 522.90 
 
 24.332. Duralumin Tubes, 100 cc capacity. 
 
 Duty Free, each 4.65 Duty Paid, each 5.b0 
 
ARTHUR 
 
 THOMAS COMPANY 
 
 No. 24400. Chan IX No. 2J40n. Chart III 
 
 Charts, Tabulae Anatomicae, Lendenfeld, a comprehensive aeries of large charts coverinif the whole 
 range of human anatomy, in finest color lithography after hand drawing, with explanatory text. 
 The charts are 207 cm high by 74 cm wide. 
 Chart 1. Integumenl (Skin and hair follicles, various sections). 
 
 ir. Structure of Bones, Cartilages and Teeth (various sectious of cartila^a and loivtr molar teeth, femur, et,-i. 
 Ill- Skeleton (Anterior view). 
 IV. " (Posterior view). 
 
 V. Skull (various views). 
 " Vr. Parts of Skeleton (Vertebrae, hand, foot and hyoiJ bono). 
 
 " Vir. Connective tissue, adipose tissue, ciliated epithelium, 
 
 VIII. Muscular Tissue (various muscles). 
 IX- Muscular System (anterior view of the superficial mnscloal. 
 '' X. " " { " " " deep-aeateil " ). 
 
 " (posterior view of the suporficiul mviscles). 
 
 XII- 
 
 XV. 
 XVI. 
 
 it;les of the palm and back). 
 
 H (V! 
 
 ra). 
 
 Corobruin . 
 
 XVII. Paris of the Nervoua System (spinal cord, ganglio 
 
 XVIII. Organs of Taale and Touch (tongue, taste buds, i 
 
 " XIX- Bye, Nose and Nasal Sinuses. 
 
 XX. Retina (transverse section). 
 
 " XXI, Ear (loft inner ear, cochlea and diagrammatic section), 
 
 " .\.XII, Ear (transverse section). 
 
 XXIII. Organs or Circulation and Respiration (Femoral vein, blood lapiUarios, blood corpuscles, lymph spaces, 
 
 nrtnry, trachea, terminal bronchus). 
 
 XXIV- Heart. 
 
 XXV. Arterial System (anterior view). 
 
 -XXVI, Venous and Lymphatic System (anterior view of the veuous system and lymphatic plyxua). 
 
 .MXVII. Lungs and Abdominal Viscera (anterior view) and Organs of Digestion (frontal view). 
 
 .XXVIII. Organs of Digestion (wall of the intestines, epithelium of the stomach, salivary gland, pancreas, liver ) , 
 
 " XXIX. Organs of Digestion, Urinary Organs and ductless glands- 
 
 " XXX. Ductless Glands and Male Genitalia (spleen, adrenal, thymus, thyroid, testicle, spermatozoa). 
 
 XXXI. Male Genitalia. 
 
 XXXII. Female Genitalia (anterior view of the ovarv, section through the ovum). 
 
 XXXIII. Situs Viscerum (mmlian view of the head and female trunk). 
 
 Charts, as above, each duty free 3,60 
 
 " " " complete set of Charts Nos. I to XXXIII, inclusive, duty free 118.80 
 
 124 
 

 ie, Pathogene 
 
 res, 1 
 
 Bakterien. Pattogonic 
 
 ^ Bacteria- 
 
 1 
 
 
 [ ',ii ^?] 
 
 r 
 
 - *'i 
 
 r^ 
 
 r- 
 
 ®!^' -■•] 
 
 h%'^ 
 
 k 
 
 ^m 
 
 t:^^ 
 
 
 
 
 Series II. Chart No. 1. 
 
 3. 
 
 riasmoptysis. 
 
 "acceriolysis. Phagocytosis, 
 iccas pyogenes. Aricrocooeus 
 
 ■i.u.s pncMi' 
 
 No. 24404. Series !. Chart 3 No. 2J104. S.Tif.s II, Chart 3 
 
 24404. Charts, Bacteriology, Lucksch, a series of 18 charts, with accompanying text in German, English and 
 French, carefully executed in colors. Series I consists of 6 charts 81 x 110 cm devoted to General 
 Bacteriology and Series II consists of 12 charts, 80 x lOG cm, devoted to Pathogenic Bacteria. 
 Series I, Chart No. 1. Forms of Bacteria. 
 
 " " " 2. Structure of Bacteria Cells. 
 
 " " " 3. Capsules, Sheaths and Cilia. 
 
 " " " 4. Division Gonidia. 
 
 " " " 5. Reproduction by Spores. 
 
 Ramification. Forms of Involution. 
 Bacillus typhi abd. ,\tiglutination 
 Staphylococcus pyogenes. Streptocoi 
 tarrhalis. ISIicrococcus tetragencs. 
 Micrococcus gonorrheae. Micrococcus meningitidis. 
 
 moniae. Micrococcus melitensis. 
 Capsule cocci. Bacillus capsulatus Friedlander. Bacillus anthracLs. 
 Bacillus tetani. Bacillus Chauveau. Bacillus oedematis maligni. 
 
 Bacillus botulinus. 
 Bacillus aerogenes Welch. Bacillus pyocyaneus. Bacillus typhi abdom- 
 
 inalis. 
 Bacillus diphteriae. Bacillus tuberculosis. Bacillus leprae, 
 "icillus influenzae. Bacillus mallei. Bacillus pestis. B:H.illus chol- 
 
 erae gallinarum. 
 Bacillus suisepticus. Bacillus suipestifer. Bacillus rhu.^iopLillLia(.-8uum. 
 Aktinomyces. Bacillus necroseos. Bacillus ulreris mnilis. 
 Bacillus fusiformis. Vibrio cholerae. Spirillum gallniLii iiiii. 
 " " 12. Spirillum febris recurrentis. Spirillum framboesiae tr(jpi(;ic. .Spnu- 
 chaete pallida. 
 
 Charts, as above. Scries 1 (6 charts), unmounted 9-00 
 
 " " " " " " " mounted on linen with rollers 13.50 
 
 " " " Series II (12 charts), unmounted 18.00 
 
 " " " " " " " mounted on linen with rollers 27.00 
 
 24408. Charts, Bacteriology, Roux. These charts are prepared in the laboratories of the Pasteur Institute, 
 Paris, and are carefully reproduced in colors. They are lithographed on heavy jiaprr SO x: ft2 
 cm with edges bound and with eyelets for hanging and are accompanied by explanatory text, in 
 English, French and German. 
 
 Bacleria. 
 
 s. 
 
 10. 
 
 Moulds. 
 Anihra:?— colon; 
 
 -apleen PuId. 
 
 -liver. 
 Conlinued on next pafie. 
 
 gel at 
 
 Anthrax — kidney. 
 Chicken Cholera — blood. 
 Erysipelas — blood of pigeon. 
 — liver of pigeon. 
 " — spleen of pig. 
 Staphylococcus— culture in bouillon. 
 Streptococcus — culture in bouillon. 
 
 " — -kidney. 
 
 Pneumococcus — culture in gelatine. 
 
Charts, Bacteriologv, Roux (cuntinued) 
 ,<, .. —blood. 
 
 21. Plague— 
 
 — blood from spleen. 
 ir from buba. 
 "n of rabbit 
 
 27. Bacillus Trphaaus— 
 
 2fl. Cholera— vibriona. Flagella. 
 
 30. Recurrenl Fever— blood. 
 
 31. Gonococcua — pua. 
 
 32. Tuberculosis— reactioi ' 
 
 33. " — aviare, spleen of rabbit, giaat cells. 
 
 34. Tuberculosis — initial intra vascular y phagocytosis. 
 
 35. " — intravasculary tubercle, 12th day. 
 
 36. " — perivasculary tubercle (kidneyl 25th day, 
 
 37. " — ramified bacilli. Yellow degeneration. 
 
 38. " — encysted bacilli. Spleen of rodent, 
 
 39. " — sputum. 
 
 40. Leprosy — section of skin. 
 
 41. Glanders — pus and section of lung. 
 
 42. Actinomycosis — phagocytic reaction. 
 
 Charts, romplpte set is ibove duty free 
 
 Dipiitheria- culture on coagulated serum. 
 " — smear from foaaiel membrane. 
 
 " —section of trachea. 
 Septic Vibrion — flagella. 
 
 " " — peritoneal exaudate. 
 
 Symptomatic Anthrax — peritoneal essudate. 
 Tetanus — bacillus with, flagella. 
 " — culture with spores. 
 " — spores in phagocytes. 
 Cancer — development of archoplasm. 
 " — spermatogenesis of guinea pig. 
 " — pseudo-coccidia. 
 Small pox — cornea of rabbit. 
 
 " —pustule in skin of monkey. 
 Coccidia in rabbit— life cycle (achematic.l 
 
 " " " — adenoma of liver. 
 
 Malaria — haematozoan in fresh blood. 
 
 — " " blood after staining. 
 
 " — development of Haemamoeba reliota ii 
 
 " — Anopheles and Culex. 
 Trypanosoma in rat — division. 
 
 '' " " — agglutiuation. 
 
 " ■' tse-tse fly— division. 
 
 No. 24412— Kny Botanical Chart 
 
 Br sera rot undif olia L. 
 No. 24116 
 
 24412. Charts, Botanical, Kny, on heavy chart paper, printed in colors, 69 x S5 cm, with explanatory text. 
 The old series consists of 100 charts in sections of 10 charts each (excepting sections VI and 
 VII), each section being furnished in a portfolio and sold only by the section. For the new 
 series see No. 24416. 
 Section I, Charts I to X, in portfolio, duty free 7.20 
 
 I. Structure ot the living plant cell and arrangement of its most important elements; the two chief kinds of 
 protoplasmic movement inside a closed membrane, rotation and circulation and transition between the two. 
 II, Structure and development of the starch grain. 
 ni. The chief forms of Calcium Oxalate crystals. 
 IV. Chief strSges in the conjugation of a large species of Spirogyra. 
 V. Milk cells of Euphorbia splendens and Lactuca sativa L. 
 Vl-Vn. A few of the most important forms of one-celled hairs. 
 
 VIII. Longitudinal section through a dicotyledonous vascular bundle. 
 IX. Vascular bundle from the interior of the stem of Saocharura officinarum L. 
 X. Development of the embryo of Braaaica Napua L. 
 
 Section II, Charts XI to XX, in portfolio, duty free 7.20 
 
 XI. Structure and development of the epidermis of Ficiia elastica. 
 
 Xn. Portion of a transverse section of a leaf of Pinus Larioio. 
 XIJl. Stoma of Thymus Serpyllum, surface and tranaverae section. 
 XIV. Tranaverae section through the vascular bundle of the petiole of Polypodium vulgare. 
 
 XV. Part of a tranaverse section of a three year old twig of Tilia parvifolia. 
 XVI. Transverse section through vascular bundle from the stem of Cucurbita Pepo. 
 XVII. Medium longitudinal section of the rapidly growing root-tip of Seoale cerealc. 
 XVin. Tranaverse section of a well developed radicle of Secale cereals. 
 XIX. Development of the ovule of Oenothera biennis. 
 
 XX. Ovule of Viola tricolor immediately after fertilization, drawn in median longitudinal section. 
 
Charts, Botanical, Kny {uontiimeil). 
 
 Section III, Charts XXI to XXX, in portfolio, duty free 9.00 
 
 XXI. Dovolopment of Peronoapora ciilotheca dc Bary. 
 
 XXII-XXin. Devdopmorit of Mucor Mucedo L. 
 
 XXIV-XXV. Development of Pucclnia craminis (Pers). 
 
 XXVI. HeproductioQ in the Florldeao.— Noiiialion multidura (Wob. mid Molir.). 
 XXVII. " " " " — fjoioUsia mediterracea (Bornet). 
 
 XXVin. " " " " — Dudroatiayacoccinea (Poir). 
 
 XXIX. DcvelnmneTit nf tlip tin of thu stern of Hippurifl vuigarLs f,. 
 XXX. " " " " " " " " Elodea canadciiais (L. (i. Rlcli and Michaus). 
 
 Section IV, Charts XXXI to XL, in portfolio, duty free 9.00 
 
 XXXI. DiivdopiiitTiLof Rivularia fjullata (Poir). 
 XXXII-XXXIII. ■■ ■■ Eiirotiiim. 
 
 XXXJV-XXXV. " '■ Petiirniiiim orustaceum L. (FrLra). 
 
 XXXVI. '■ " the Fuca<;eae-Apial Kfowtli ..f P.!.,,r.. . ;■ ,, .li.-nha. 
 
 XXXVn-XXXVin. " ■'_ " "_ —FertilizaUnn r. t i.'- -,. ,1 .^im L. 
 
 XXXIX. neteroi;onou3 diinorphiam in the finwerd of Prin I . i ■■! ■ ! i. 
 XL. " trimorphiam in tbft flowers of Ljrii. r, • • i.i I, 
 
 Section V, Charts XLI to L, in portfolio, duty free 9.00 
 
 XLI-XI.IV. Development of Claviceps purpurea (Fries). 
 XLV-XLVIII. ■' " Botrydium granulatum L. 
 
 XLIX. Transverse section tiirough a vaseiilar bundle alioiviug soft, bast divided into two portiona from 
 the middle part of the petiole of Chamaeropa humilis Ii. 
 L. Reduced vsscular bundle from the stem of Elodea canadensis (Rich. & .\lichv.) in transverse 
 
 Section VI, Charts LI to LXV n portfolio dutj free 15.00 
 
 LI-LIII An to of nen oio r nus 1 si 
 
 LIV r sv rse se o t gl t n ler o h o \3pT g s o Ticinalis L. 
 
 rV \ ape turn L 
 
 LVr the oot of \ c a Faba L in the beginning of 
 
 ondarj grontt 
 
 LVII e ae a»ct o tl ro " the ie of the oo of ^ c a Faba L showing advanced 
 
 LVIII De pmento th L 
 
 LIV 1 k 
 
 L\ 
 LXI-LXII e 
 
 LXIII-LW p It 
 
 Section VII, Charts LWI to LXXX n p rttolio duty free 15.00 
 
 LXVl-LXMr L 
 
 LXVin-LXXIIl 
 LXXIY-LXXM 
 
 LXX1 II Huda 
 
 LXXVIII a a a e a L 
 
 LXXIX L a aena D a o L 
 
 LXXX 1 of 3 o iar keu ok t e stem of Dracaena 
 
 r I 
 
 Section VIII, Charts LXXXI to XC, m portfolio, duty free 12.00 
 
 LXXXNLXXXin. Developmental proceaaea In the embryo-sac of Monotropa Hypopitys L. 
 LXXXIV-XC. Structure and development of Marchantia polymorpha L, 
 
 Section IX, Charts XCI to C, in portfolio, duty free 12.60 
 
 XCl. Structure and development of the granda of lupine. 
 XCU. Pollination of the flower of Aristolochia Clematitia L. 
 XCIII-C. Development of Aspidium Filis-mas Sw. 
 
 24412. Complete set of 100 Charts, as above listed, consisting of 9 sections, duty free 96.00 
 
 24416. Charts, Botanical, Kny, New Series. These charts are larger than the old series, i.e. 106 x 150 cm and, 
 while published in sections of varying numbers, are also sold separately. See illustration, 
 page 126. 
 
 Section X, Charts Nos- 101 to 105. Section XII (continued). 
 
 101. Drosera rotundifolia. 113 and IIJ. Internal sirui-ture of the Sun- and 
 
 102. Mimosa pudica. Shade leaves of the Red Beech 
 
 103. Spirogyra setiformia I FaEus ailvatica L). 
 
 104. Cusouta Trifolii. 113. The Plasmodium of Fuligo variana 
 
 105. Berberis vulgaris. {Aethahum septlcum). 
 Section XI. Charts Nos. 106 to HO. Section XIII. Charts 116 to 120. 
 
 106 and 107, Dionaea muacipula L. 116 and 117, Ectotrophic and Endotroplilo Mycor- 
 
 108. Centaurea Jacea L. hiza. 
 
 109 and 110. Mucor SvKv^ites de Bary. 118. Surface Modelling of Spores. 
 
 Section XII. Charts Nos. Ill to 115. 119 and 120. Apical Growth ot Roots of Phanero- 
 
 111 and 112. The honey substitute of Orchard Eyiiis. 
 
 Flowers, MaJclllaria rufescens. Stan- 
 hopes graveolens and Stanhopea 
 oculata. 
 
 24416- Charts, Kny, New Series, as above, unmounted, per section, duty free 10.50 
 
 " " " " " " " each, duty free 2.40 
 
 24418. Charts, Kny, New Series, mounted on linen with rollers, per section, duty free, 15.00 
 
 " " " " " " " " " each, duty free 3.30 
 
A R T H LI R 
 
 THOMAS COMPANY 
 
 \1- 
 
 
 No. 24120— F 
 
 id Techirch, Botanical 
 
 Charts, Plant Physioiogj, Frank and Tschirch, printed in colors upon heavy ctiart paper, 69 x S.5 cm, 
 each with explanatory text. These charts are furnished in six sections of 10 charts each, each 
 section being furnished in a portfoHo. They are sold only by the section. 
 
 Section I, Charts I to X, in portfolio, duty free 
 
 I. Zoiios <A growth m dlcotvledonoiis plants. 
 [I. Hoot lijirs. 
 
 lI tiaaiie in monocotyledona. 
 
 Ge 
 
 n tal.c 
 
 n of o 
 
 9.00 
 
 VI. Orisui. groivth and separation of atarcli grams. 
 
 VII. Structure of the leaf of Beta vulgaiis (common lii.-et). 
 
 VUl. Appearance and di%'ision of the stoniata. 
 
 IX. Forma of atomata. 
 
 X. .M\oorhiza of trsea. 
 
 Section !l. Charts XI to XX, in portfolio, duty free 
 
 XJ. Thi;iiell. 
 
 Xlt. MiiltipHcution of cella by division. 
 
 XIII. The growing point, and growth of the stem. 
 
 XIV. Cholorophyll grains. 
 
 XV. Spectra of chlorophyll, xanthophyll and of living ii^avea. 
 XVI, " " alcoholic aolutiona of green and of etiolated leaves. 
 
 XVII. Young atema of Heiianthus annua (Sunflower), first appearance of the ducta. 
 XVin. " " " " " enlarged. 
 
 XIX. Older stem of Heiianthus annus in transverae aection. 
 XX. " '■ ■' Heiianthus annua, enlarged. 
 
 Section III. Charts XXI to XXX, in portfolio, duty free 9.00 
 
 XSI. Germination of the pea. 
 
 XXIi. Stem of Linum usitatissimum (flas) In cross section , rigidity bv means of wood and bast fine. 
 
 XXm. (^Toi^'th of a stalk of rye. 
 
 XXIV. Fihro -vascular bundle and starch alieath of corn. 
 
 XXV. Stoma of beet leaf. I. 
 XXVI. " •' " " 2. 
 
 XXVII. Origin and appearance of root hairs. 
 
 XXvni-XXIX. Division of tJie nucleus. 
 
 XXX. Chromoplaata. 
 
 Section IV, Charts XXXI to XL, in portfolio, duty free . 9.00 
 
 XXXI. Germination of (\bx. 
 
 XXXn. Eoot-tubercles of the lupine. 
 XXXni. " " " " pea. 
 
 XXXIV. Banteria and symbiotic fungi of the Leguminosaa. 
 
 XXXV. The entrance of the symbiotic fungus into the lupine. 
 
 XXXVl. ■■ ■' " " " ' pea. 
 
 XXXVII. Roiit tubercles of PhaseoUis nanus. 
 
 XXXVin. Daily period of growth. 
 
 XXXIX. Ring ducts. 
 
 XL. Spiral ducta. 
 
 Section V, Charts XLI to L, in portfolio, duty free 9.00 
 
 XI,I-XLIV. Forma oi starch grains 
 
 XLV. TriLii-Li.iii, ,ri>i.i the i.rimary structure cf the root to the secondary and throwing off of the primary 
 
 XLVl. I'lT i. I I .1 I .frk formation). 
 
 XLVII. ('..rl . , .i.ji .-iolanum tuberosum (Potato). 
 
 XLVIII. C^llij.. u! ■.-.c.ui.di and leaf scars 
 
 XLIX, Koot sjstciij; of the Dicotyledons (lupine, muatardl. 
 L. " " " " Monocotyledons irye). 
 
Charts, Plant Physiology, Frank and Tschirch (contiiiiicil) 
 Section VI, Chart LI to L\ portfolio, duty free.. 
 
 LV Q o the cycle of plants. 
 I I 
 
 L II iueta. 
 
 Ill of the UmbcUifcrae. 
 
 I \ Lablatae and CoTTipositatK. 
 
 I \ p, hop anil ci.stiia. 
 
 24420. Complete set of G{ * hart hv nk and Tschirch, duty free 54.00 
 
 24421. Charts, Plant Phy log Trrtra and Laurent, consistins of a wet of 15 cluirta printed in colors, 70 x 85 
 
 i;m, with ex 1 11 Gerniiiu an<l English. The.se charts cover all of the more 
 important l 1 1 nt Ph s ology such as root nutrition, leaf respiration and trans- 
 piration, fe I tr t on, growth, geotropism, heliotropism, climbing and creep- 
 ing, etc. Per el du Iree 15.00 
 
 24422. (.'harts. Plant Pathology, Tubeuf, colored reproductions, inountud on lincfi with rollers and each chart 
 
 accompanied by explanatory text. 
 
 Series 1, con^i.-■l ii- -.f fli:,, ( .. X<w I 1 ., c, i:v 'ii-i>..', each SI) x 100 du, per set of six. dutv free 12.40 
 
 1. TIm, M- '.I !"■ . ■ , \-..--: ■ ,! .ini L.!. 
 
 3. Thc;J'-i>l.tn\..n . I.MhcM-a S,iu;im:u'i;ij. 
 
 4. Erisiphaceae (IMiklew funiii). 
 
 5. The Rusts of Grain, I. 
 
 6. " " " " II, 
 
 Series II, consisting of Charts Nos. 7 and S, each 80 x 120 cm, per set of two duty free. , . . 5.10 
 
 7. Rinut Diseases of Grain I (Stinking Smut of Wheat). 
 
 S. " " " " II (Loose Smut on Barley, Wheat and Oat^i. 
 
 24423. Charts. Tabulae Botanicae.Blakeslee, Guiliermond, Bauer and Jahn. These charts are of large size, 
 
 i.e. l-")0 X 100 cm, and eaclj chart is prepared by a specialist on the botanical order represented. 
 The dr;iwing and coloring is done by Ehrlich, of Berlin, under the direction and with the assist- 
 ance 111 Uie authors mentioned above. 
 Series I, C'hart 1, IMyxobacteriaceae, development of Polyangium fuscum. 
 
 " " " 2. " kernels of Myxococcus, spores of Myxoeuccus. 
 
 " 3. Acrasieae, development of Dictyostelium mucoroides. 
 " " " 4. Myxomycetes: Sporangia of Dictydium umbilicatum (A, B), Trichia t'allax 
 
 l(\ D), Leocar!)us fragilis (F), Plasmodium of Lencarpus (E). 
 " " " 5. Splitting of Rhoeo discolor. 
 Series II, Chart 6. Mucorineae. Mucor. 
 " " " 7. Mucor. Rhizopus. 
 
 " ■' ■' 8, Ustilagineae I: Ustilago Tragopogonis. 
 " " " 9. Volvocaceae. Endoriua elegans. 
 " " " 10. Phaeophyceae. Ectocarpus I. 
 ■' II. " " II. 
 
 '■ " " 12. Rhodophyeeae. Nemalion. 
 
 Complete set of 12 charts, "as above, unmounted, duty free 55.20 
 
 " " " " " " " mounted on linen with rollers, duty free. 67.80 
 
 When the above Charts arc ordered singly, prices are as follows: — 
 
 Charts I. 2 and 4, unmounted, each duty free 8.10 
 
 " " " " " mounted on linen with rollers, each duty free 9.15 
 
 Charts 3, 5, 6 and 7, unmounted, each duty free 6.45 
 
 " " " " " " mounted on linen with rollers, each duty free 7.50 
 
 S, 9, 10, 11 and 12. unmounted, each duty free 4.80 
 
 " ■■ '• " " " ■' mounted on linen with rollers, each duty free 5.85 
 
 24424. Charts, Chemical Technology, each chart is arranged after drawing by an authority on the subject 
 
 illustrated. Charts are 170 x 125 cm and illustrate twelve of the most important manufacturing 
 processes in the chemical industry. 
 
 I, Bessemer Steel Manufacturing, by Prof. A. V Kerpely. 
 II. Glover Tower Manufacturing of Sulphuric Acid, by H. Schaffner. 
 
 III. Ammonia Ice Machine, by F. Carre. 
 
 IV. Beer Brewing, by Gustav Noback. 
 
 V. Condensation of Hydrochloric Acid, by H. Schaffner- 
 
 VI. Sugar Refining. 
 
 VII, Diffusion Apparatus, by Julius Robert. 
 
 VIII. Martin Steel Manufacturing, by Siemens. 
 
 IX, Iron Furnace for Cokes. Producing from 50 to 60 tons a day. 
 
 X. Puddling Furnace, by Dr. Jos. Schmiedhamer. 
 
 XI. Sulphur Distillation, by Dr. Pasqualini. 
 
 XII. Tile-Making; Hofmann's Ring-Oven. 
 
 Charts, as above, mounted on linen with rollers, each duty free 7.50 
 
N». 2-1 42S 
 
 24428. Charts, Chemical Technology, von Schroder, size 106 x 78 cm, showing the more important manufacturing 
 processes based upon chemistry. Mounted on linen with rollers. 
 
 Series I. Series V. 
 
 Chart 1. Production of sulphur. Chart 21. Gas generator. 
 
 " 2. Refining crude sulphur. " 22. Glass-potfurnace. 
 
 " 3. Preparation of nitric acid. " 23. Glass-troughfurnace. 
 
 " 4. Preparation of sulphurous acid by " 24. Glass-stretching furnace (formak- 
 combustion of pyrites for use in ing plate glass), 
 
 the manufacture of sulphuric " 2.t. Hoffman's ring furnace, 
 acid. Series VI. 
 
 u r. / A. Furnace for lump pyrites. Chart 20. Lime kiln. 
 
 \ B. Furnace for fine pyrites. " 27. Manufacture of porcelain. 
 
 Series II " "^' Manufacture of sodium. 
 
 Chart 0. ftulphuric acid factory, ground plan. " ~^- Manufacture of aluminum. 
 
 " ^" ^^IP^^'^'-'^'^'^^^^^^'y'''^'^''^^^'''- Chart 31. CharrmTofwood. 
 
 8. Details in the process of manufac- [[ l^' 2'^^^ furnace. 
 
 turing sulphuric acid. . f,' Furnace for roastmg iron ores 
 
 " 9. Concentration of acid. .. ^f ^ron-blast furnace (Hochof en). 
 
 " 10. Preparation of fuming sulphuric ^^- Blast super heater (Winderhitzer). 
 acid series VIII. 
 
 Chart 36. Fresh fire (Frischfeuer). 
 
 Series III " ^^- P^'^dling furnace. 
 
 Chart U. Salt Garden. ' [] ^8. Bessemer pear. 
 
 " 12. Graduation house. ,, f^' ^^,1^" f^Tfjace. 
 
 ■' 1-3. Salt boiling. *^- R-oUing mdl. 
 
 " 14. Soda manufacture. , ., ^ ,, , henes lA. 
 
 " 1.5. Condensation of muriatic acid. ^- ''A"'* fh J'-f'' f^^nace. 
 
 4J. ^llver lurnace. 
 
 Series IV. " f?- ^^PPf '" f^iriacc. 
 
 Chart 16. I „ ff ^f"f' f'^-'iace. 
 
 " 17. [ Manufacture of illuminating gas. ^"^^ Mercury furnace. 
 
 " 18. I Series X. 
 
 " 10. Manufacture of phosphorus. Chart 46, 47. Semet-Solvay coke ovens. 
 
 " 20. System of generative heating, Sie- " 48. Pure .\luminum. Calcium Car- 
 
 mens'. bide. 
 
 " 49. Carbon Bi.su phide 1. 
 " .50. " - 11. 
 
 Charts, as above, in lots of not less than five, each duty free 1.35 
 
 " " " " " " any series of five, duty free 6^00 
 
 244.52. Chart, the Elements and their Atomic Weights, as adopted by the International Committee, 62x62 
 
 inches, mounted on linen 4_qq 
 
 244.%. Chart, as above, mounted on linen with wooden rollers 5,00 
 
 24440. Chart, Periodic Arrangement of the Elements, Mendelejeff, latest arrangement by Baskervilie, 
 
 mounted on linen 2.00 
 
 24444. Chart, as .■i.bovo, mounted on linen with wooden rollers 2..'>0 
 
ARTHUR H. TH 
 
 MAS COMPANY 
 
 
 
 / 
 
 ■ ©'- ,. V 
 
 No. 2'UIS. ScrUs 2. Char 
 
 No. 2J448. Series 1, Chart IV 
 
 24448. (harts, Parasitic Protozoa and their Carriers, Donitz and Hartmann. This publication is to eventually 
 include 18 to 20 charts, of whii'h 10 to 14 charts will bo devoted to Protozoa, Series I, and 6 to 8 
 charts to their carriers. Stories 1 1 At the present time 9 charts of Series I, as per list below, have 
 been issued and 2 cluti ts <>nly ni" Scries II, the work having been interrupted because of Dr. Hart- 
 mann's absence in Suiitli America. Series I charts are 120x160 cm and Series II charts are 
 90 X 120 cm. They are carefully executed in colors. 
 Series I, Chart I. Chiamydophrys encihelys (Ehrbrg.)- 
 
 " " II. Trichomastix lacertae (Biitschli). 
 
 " " III. Leuoozytozoon Ziemanni (Lav.). 
 
 " " IV. Plasmodium vivax (Grassi et Fel.). 
 
 " " V. Lamblia muris. Lamblia intestinalis. Trichomonas intestinalis, Nyc- 
 
 totherus faba. Ealantidium minutum. Balantidium coli. 
 
 " " VI. Haeraoproteus columbae. 
 
 " " VII. Trypanosoma lewisi. 
 
 " " VIII. Entamoeba tetragena (Viereck). Entamoeba hystolytiva (Schand). 
 
 " " IX. Leishmania donovani CLav. u. ilesn.) 
 
 Series II, Chart I. Glossina palpalis (Robin Desv.) 5. Glossina morsitans (Westw.) <f. 
 
 " " II. " morsitans Details. Glossina fusca (Welk). 
 
 24448. Charts, as above, unmounted, each duty free 3.00 
 
 " " " mounted on linen with rollers, each duty free 3.75 
 
 24452. Charts, Haematology and Cytology. Landouzy and Labbe. These charts are prepared under the 
 direction of the Pasteur Institute, Paris, and are finely executed in colored lithographs on heavy 
 paper with stout binding and eyelets for hanging. Size 80 x 62 cm. 
 
 Normal Blood Serum 
 
 I. Leucocytes. I. Blood Serum. 
 
 rV. Spectrum. 
 
 Palhol 
 I. Variole. 
 II. Lymphatic Leucemia. 
 III. Myelogenic Leucemia, 
 IV. 
 \'. Di.'jturlianceg ot Herr.iit 
 
 24452. Charts, as above, complete s 
 
 Blood ii 
 
 Primary Tuberculosis of the Pleura. 
 Secondary Tuberculosis of the Pleura 
 Hydrothorax. 
 Pleurisy due to Piieum 
 Sarcomatous Pleurisy, 
 
 ;t, duty free 20.00 
 
Charts, Paleontology, Zittel and Haushofer, consisting of 83 charts, 100 x 140 cm, mounted on linen 
 with rollers, illustrating fossil animals and including S ideal landscapes after Haushofer. The 
 ideal landscapes consist of Charts Nos. 6, 7, 8, 9, 26 and 40, as follows:^ 
 Chan 6. Carbonic Era:— falaniites, Ferns, PecopterU, Neuroptcris and other plants of this period. 
 " 7. Obltgocpne Period:— Palms, Flabelaria, Phoenicitea, AnthracoterLllum, etc. 
 ■' N. Carbdiiic Era:— Ligillariia, Lepido den. 
 
 S. Jurassic Era:- Spoiigen, Corals, Lepidotua, Ammonites, Cycad and Pterodactyl. 
 " 26. Glacial Period:— Alps showing glaclation, moiainea, reindeer, temming and mammoth 
 " 40. Cretaceous Era:— Cypress, Arancaria, SeguoLa, Credneria, Iguanodon. 
 
 The contents of the entire series is given below, with the chart numbers: — 
 
 Chart. rh^ri 
 
 A.mH p la 
 An r t il 1 
 ^.rtlozoa 
 \nthr irJi 
 \rt o lacfvla 
 
 Carnuora 
 Castle (je\ ser 
 Cephalopoda 
 
 56 
 
 
 
 
 75 
 
 42 43 
 
 
 
 
 18 32 33 
 
 
 
 
 
 66 
 
 30 31 82 83 
 
 
 54 
 
 
 5h T IS 61 62 63 
 
 6 68 69 "0 
 
 
 ti4 65 
 
 m 
 
 b7 h8 69 70 71 72 
 
 53 
 
 Mamn oth Hot 'Springs 
 
 \ello 
 
 
 ne Park 20 
 
 
 Mars ipial a 
 
 
 
 
 
 Mollusca 
 
 IS 
 
 11 
 
 ■'1 '>'• 21 "4 '■5 27 
 
 1 2 
 
 Mclluacuilet 
 
 ^ 
 
 '« 
 
 o2 33 78 79 80 81 
 5 16 17 77 
 
 41 
 
 Paleobinoi \<'-\ 
 
 
 
 
 
 Peri-aodi t\ h 
 
 
 
 
 
 Ph%teronorpla 
 
 
 
 48 
 
 
 
 
 
 
 2 3 4 5 76 
 
 Prol oaoid. 
 
 
 
 
 
 Protozoa 
 
 
 
 
 
 Ptero-iur 
 
 
 
 52 
 
 49 
 
 Raiiilir i 
 
 
 
 74 
 
 JO 31 82 83 
 
 Reptiln 
 
 
 31 
 
 
 
 
 
 
 
 28 
 
 r 1 izoroJa 
 
 
 
 1 
 49 
 
 ^n 51 59 60 
 
 Ru listae 
 
 
 
 33 
 
 1 12 13 U 15 
 
 bauropterj gn 
 
 
 
 
 
 Vaphor Jda 
 
 
 
 
 
 Schalenl-aij 
 
 
 
 
 
 
 
 
 34 
 
 ! 23 24 "5 27 79 J 
 
 Cyato dea 
 Dibranchia 
 Dmnsauria 
 
 ' 1 4 Spongier 2 
 
 I J 8 SteKuiepl all 42 43 
 
 -9 Pestudinata i? 
 ' •> Tetrabrinchiata 
 •' ' C Theromurpha 
 
 I I 4-1 Toxolontia 53 
 
 "'111 H 6 " R 9 'R 4(1 Trilol itae 30 S' 83 
 
 \ertel rata 34 to 3" 4" to 73 
 
 Chart.';, ;is above, Nos. 1 to 83, with the exceptions noted below, each duty free., . i gS 
 
 Nos. 6, 7, 8, 9, 26, 40 and 74 to S3, each duty free 1.80 
 
 " Nos. 20 and 41 , each duty free 2.10 
 
 " Complete set. Kns. I U< S3, duty free [','/_] ISSM 
 
 132 
 
No. 24460 
 
 Charts, Crystallography, Schwarzmann, consisting 
 chart 70 x 96 cm. 
 Chart 1. Regular system. 
 
 " 2. Irregular systems. 
 
 " 3. Heniihedron system. 
 
 " 4. Elements and sulphides, 
 
 " 5. Oxides. 
 
 Complete set, as above, duty free 
 
 Charts, Paleontology, Zittel, Pompeckj and Salfeld, 
 
 trating fossil plants. 
 
 Chart 1. Thallophyta— Aigae. 
 
 " 2. Gymnospermae^Cycadeles. 
 
 " 3. " Ginkgoales. 
 
 " 4. " Coniferales. 
 
 i — Pccopteridae. 
 
 charts with 113 illustrations i 
 Chart 6. 
 
 ; size of each 
 
 7. 
 
 isistin§ 
 Chart 
 
 Oxides, halogens, aluminatea and 
 
 borates. 
 Carbonates. 
 Sulphates, molybdates, wolfra- 
 niates & phosphates. 
 3. Silicate. 
 
 7.20 
 
 of 10 charts, each 105 x 130 cm, illus- 
 
 5. 
 
 Filices — Sphenopteridae . 
 
 " Cryptogamae — Neurop- 
 teridae. 
 Filices — Cryptogamae — Dictyop- 
 teridae. 
 
 " Palaeopteridae. 
 " 10. Cryptogamae — Sphenophyllae — 
 Hydropteridae . 
 
 Charts, complete set of !0, as above, mounted on linen with rollers, duty free 18.00 
 
 Charts, Paleontology, Fraas. This series shows the development of the earth with its inhabitants, 
 striagraphic formation, type fossils and landscape reconstruction. Each chart is 95 x 125 cm, 
 with explanatory text. 
 
 Chart 1. Old paleozoic. Chart 5. Cretaceous formation. 
 
 " 2. Later " " 6. Tertiary " 
 
 " 3. Triassic formation. " 7. Diluvian " 
 
 " 4. Jurassic " 
 
 Complete set, as above, unmounted, duty free 10.00 
 
 " " " " mounted on linen with rollers, duty free 15.15 
 
 Charts, Petrography, Sauer, consisting of 12 charts showing the microscopic structure of the most im- 
 portant rock types, size 75 x 100 cm, with explanatory text . 
 Chart 1. Granite, from Lausitz. Chart S. 
 
 " 2. Gabbro from Volpftrsdorf. " 0, 
 
 " 3. Obsidian from Mexico. " 10. 
 
 " 4. Pitfhstone from Arran. 
 
 " 5. Vitrophyre from Lugano. " 11. 
 
 " 6. Pitchstone from Meisse::^. " 12. 
 
 " 7. Leucite porphyry, Lake Laach. 
 
 Complete set, as above, unmounted, duty free 6.00 
 
 " " " " mounted on linen, with rollers, duty free 11.40 
 
 Feldspar basalt, from Mt. Aetna. 
 Basalt tuff, from Swabian Alp, 
 Bunter sandstone from Schwarz- 
 
 wald . 
 Gneiss from Erzgebirge. 
 Marble from Carrara. 
 
J^7 ' ' fih i^T 
 
 W ^^%| 
 
 No. 24J7G No. 2447(1 
 
 Tharts, Zoological. Pfurtscheller. Clironiolithographic reproductions, 130 x140 cm, with explanatory 
 text in I'Jnglish, French or German. Twenty-five charts of the series are now finished by Prof. 
 Pfurtscheller. He is continuing the work and there are now in preparation charts covering Pro- 
 tozoa, Coelenterata, Echinoderma, Worms, Crustacea, Mj'riopoda, Arachnoidea and Insects. 
 The contents of the present series is as follows: — 
 
 I. ,\(." lii'ii I \~! niides calycularis). 14. Spongiae II. (Euspongia officinalis). 
 
 '2. \j\ II i.il III' liiiilii (Uni). 15. Thoracostrara (Astacus fluviatilis I). 
 
 ?,. ';.i- I ' ii I Idix pomatia). 16. Hirudinci (Hirudo medicinalis). 
 
 4. >. I. _■. l_ll.^tomi, Mustelus). 17. Infusoria (Ciliata). 
 
 '■>. I-i 1. i I ■: .sea-urchin), 18. Ophidia I. {Tropidonotus natrix). 
 
 ii. If', ..I .. . I " I ■, 1 1 r medusae (Hydra). 19. Aves I Situs viscerum (Columba domes- 
 
 7, <'i'|.li;ilii|"i'i;i iSi'pia). tica). 
 
 s. _AlnlliLsr:i ! formation of the mantle). 20. f|i<]uiii:i fEmys). 
 
 0. Cest(i(fos {Taenia !<olium). Jl. MynuiH.da (Lithobius). 
 
 in. Anthozoa (Octactinia). -2. Tulm-ii ; I'erca fluviatilis). 
 
 11. Asteroidea (Astropecten aurantiacus). 'S6, LcpiiiupiLTa (Pieris brassicae I). 
 
 12. Spongiae I. (Sycon, Aplysina). 24. Lepidoptera (Pieris brassicae II). 
 
 13. Hymenoptera (Apis mellificia I.) 2.5. Araneina (Epeira). 
 
 Charts, as above, Nos. 1 to 21, inclusive, mounted on linen with rollers, each, duty free. . 2,50 
 Nos. 22 to 25 " " " " " " each, duty free. 3.00 
 
 Charts. Zoology, Leuckart-Chun. These widely used and excellent charts are 104 x 140 cm for the 
 regular charts and 135 x lfi2 cm for the special charts. Series I consists of 103 charts of Inverte- 
 brates and Series II, so far as finished, consists of 13 charts of Vertebrates, each chart accom- 
 panied by explanatory text in English, French and German. Special prices are quoted when 
 more than 25 charts are ordered at one time. The contents of each chart is shown in the 
 appended biological classification. 
 Charts, Leuckart-Chun, Series 1, Nos, 1 to 101, inclusive, and Series II, Nos. 1 to 11, inclusive, 
 
 unmounted, each, duty free 1.80 
 
 Charts, as above, mounted on linen with rollers, each, duty free 2.70 
 
 " Series I, speci:il [-IkitIs Nos. 102 and 103, and Series II, special charts Nos. 12 and 13, 
 
 unmounted, each, duly free 3,60 
 
 Charts, as above, mounted on liuen with rollers, each, duty free 4.80 
 
 I. TYPE— PROTOZOA 
 
 Class — Rhizopoda 
 
 Order— Thalamophora 
 
 si. Chart 2. Art- 
 
 Order — Ita dio I aria 
 
 aateracanthion. Stilodictya 
 
2J4.S0. Series r. No. ; 
 
 No. 24480- Series J, No. ]02 
 
 Charts, Zoology, Leuckart-Chun icoiiLimiuib. 
 
 Class — Sporozoa 
 
 Order— Gregarinida 
 
 AptiTiocepUalus oligocaothus. Gonospora terebellae, Clepsidrina polymorpha, Un 
 ■■ 'lochyDcuslongicollia, Gamocystistenax, Cooeidiidaamoi^g the Mor 
 
 Polycystiriea, Monocyatidi 
 spora, Nemertia. Clepsidrii 
 ocyatidea. 
 
 Order— Ha e moBporidJ a 
 Life-cycle of Plaamodium praecoK, ah-owing sporozoite, schizont, achijogoi 
 crogametoblast, ookiiiple, miorogamentes, oocyst, sporohlasts. and variou 
 Anopheles claviger,— female, head of male, larva, nympha, stomach with 
 wdth sporozoitea of Plasmodium. 
 
 Ordtr— f cciidiidJ 
 Life-f\ 1p ul Loccil lum s(h ! 1 u* forficatua abo«i 
 
 macrjs mpiiti> mltrogametoHa i t sporoc-v; 
 
 SLctij ■)! kidnej ot sniil with I 
 
 Class — Iniusuna 
 Orders— Flagcllata ChoanoBagellata 
 
 75. MTatigJ.111 jeha aapera OikomuuaH turmc Nonas t,utt i1j < 
 nurj u\tlla Tetratriti q rn^tr t i \1 g trmi itt^niuili 
 Tiiogjra B vind!3 T r -rl I 1 r i 
 'inisonema erande ( r 
 
 Order?— 1 1 i 
 
 76. ^ oh oi globator Go i 
 
 •section of h 
 
 ia (merezoitea), macrogamente, mi- 
 ititerveuing stagea and proceasea— 
 of saUva duct 
 
 ng aporozoites, schizont, mecozoitea, 
 aiious intervening atepa. Deveiop- 
 :i of rabbit with Cocoidium oviforme. 
 
 fh^SI 
 
 On 
 
 ^U dii 
 
 < longicauda, Anthophyaa vegetans, Sy- 
 waa vaginalis, Haematococcua, Euglena 
 I hilomonasparamaecium, Dinobrion aertularia, 
 aiga botrvtia. 
 
 
 I Carcheaium polypinum. 
 
 " Chart 65. Hololncha Helerolncha Hypotncha ^Porodjn 
 
 maecium raudat im Froxitonn leucas Pt 
 
 ■itjlon^Lhia nij tilua 
 " Chart 67. OltQMncha Peittncha — Tmtinnopais boroidea 
 
 oollia Vortioella muroatoDja '^pirohot j, j:lu ii 
 Order — Suclona { — Aci 
 " Charl 68. Podophrja fiia. P. libera, P. puadripanlta, Ephelota gemmipara, Dendrocooimetea paradoxua, Dendro- 
 
 soma radiana, Acineta tuberoaa, Stylonychia mytilijs \\T.tii parasitic Sphasrophryae, Ophryodendron 
 
 abietinum. 
 
 II. TYPE— COELENTERATA (ZOOPHYTES) 
 Sub -type — Porifera Sponges 
 
 Class — Spongiae 
 
 Order — Fibrospongiae 
 Series I, Chart 35. Myxos pongiae, Ceralospongi<ie,Monaclenellidae: — Haliaarca dujardini, Euspongia ofTioioalis, Hircinia setoaa, 
 Aplysilla tenella, Darwinella aurea, SpongiUa laouatria, S. fluviatilis, S. lieberk(lhni,Rinalda arctica, 
 silicioua apicvilea of Monactinelidae. 
 
Charts, Zoology, Leuckart-Chun (contiriuerl i 
 
 Order— Tetraclinellidac 
 Series I, Charl 47. Tethya maza, Tetilla polyura, TisiphoTiia feneatrata, Agilardiella radiata, Cor 
 monoloplia, Geodia placenta, Caminua vulcani, Plakina trilopha, Stelleta a 
 eatile, Ancorina verrucosa, Tisiphonia agariciformia, Chondrilla phyllodea. 
 Order— L ithie ti d ae 
 " Charl 52. Loiodermatium lynceus, Seliscothonr^honelleidea, Discoderraia calyx, D. japonica. Coralliatea pratii, Kaliap- 
 
 O rder — Hexac ti nel I i dae 
 " Chart 50. Ilyalonema mirabilo, Holtenia carpenteri, Pheronema hemiapacricuiii , Roaaella velata, Phcronema annae 
 
 Crateromorpha. Euplectella suberla, E. aapergiilum, characteriatic spicules. 
 Chart 50. L|,ssocina.— An toe hone cylindra, Rhabdodietyum. delicatum; Dictyonina. 
 O rde r — Calcis po ngiae 
 " Chart 5J. Olyntliua primordialla, Aacaltis gegenbauri, Sycurus primitiviis, various forms of apiculea, Sycandra 
 
 Sub-type — Cnidaria (Corals, etc.) 
 Class — Hydro zoa 
 
 Order— Hydroidea 
 
 Serieis 1, Chart 16. Hydra viridia. H. fuaea, Cordyloph.ora lacustris, Podouorync ciirrioa, C'orymorpliu nutan.i: dingraniinatica 
 aections of typical Hydroids. 
 " Charl 20. Hydra viridis. Hydra vulgaria var. aurantiaca. Hydra grisea. 
 
 O rde t — Hy drotnedueae 
 " Chart IS. Carmarina hastata, C. fungiformis, Hippocrene superciliaria, Bougainvillea superoiiiaris. 
 
 O rder — Si phonophora 
 Chart 9G. Agalma sarsi. siphonophores of the family Calycoplioridae, Praya galea, Abyla petitagona, Eudoxi 
 cuboides, Monopliyes primordial is, Eudoxia eschacholtzi Halistemma pictum, Diphyea sieboldii. 
 Order— Acalephae (Jelly-fish) 
 " Chart 64. Aurelia aiirita,—Mastrula fixed with commencing stomodaeum, piilyp with 4 tentaelea, with 8 tentacles, 
 
 Scyphistoma with 16 tentacles, Strobila with only one Ephyrula, Hc.\phi3toma with fi aegments; Aurelia 
 flavidula. 
 
 Class — Anthozoa (Corals) 
 
 Order— Oclactinia ( = Alcyonaria) 
 Series II, Chart 1. Single zooid of an Octactinian; Corallium rubrum. 
 
 " I : Charl 9-1. Ponnatula phoaphorea, Renilla reniiormis, cross section of a polyp, eroas-aection of stalk of Pennatula, 
 Class — Ctenophora 
 Chart 74. Hormiiihora plumosa, Bolina hydalina, Cestua veneris, VeNillum p.irallcluin, Eeroeovata, Beroe forskalU. 
 
 III. TYPE— ECHINODERMATA 
 
 Series I, Charl 7a. Dei'el'ipiiiinil of l/ie Larval Form.^ of Ec'iinoierins: Simpleat larval form. Development of the Holothu- 
 riaii larva Auricularia, ot the Asteroid larva Bipinnaria, and of the Pluteua larva. 
 " Chart 80. Developrvient of Holothurla tubulosa, Cucumaria doliolum, Synapta digitata, Echinua miliaria, Atbacia, 
 
 Sub-type — Pelmatozoa 
 
 Class — Crinoidea 
 
 Order- Brachiata 
 Series I. Chart 5. Rhizocrinus lofotensis. Small individual, crown of a full-grown specimen, calyx from above, section of crown' 
 section through an arm. 
 " Chart 7. Antedon rosaceua, — Full-grown animal, calyx from dorsal aide, arrangement of fibrous strlnga. larvae. 
 
 Class— Blastoidea 
 
 Order — ^I!e;;u lares 
 
 Sfrii'E I, Chart Ifi. Pcntremites sulcatua, P. pyriformis, P. godoni, Codastor hindei, i )ro[iliocriiiiis stelliformia, Gra. 
 and Order— Irregulares 
 
 Sub-type^Asterozoa 
 Class — Ophiuroidea 
 
 Series I, Chart 5«. Ophiura, Ophiocoma, Ophioiiiyxa, Ophiothrix, Ophioglypha, Ophiarachna, 
 
 Class — Asteroidea (Starfishes) 
 
 Series I, Charl 8G. Aateracanthion rubena, peditellaria, .\stropecten hemprichti, Echinaater aentua. 
 
 Sub-type^Echinozoa 
 
 Class— ^Echinodea (Sea-urchins) 
 
 series I. Chart 81. Sea-urchin with lower floor removed, Arabic punctulata. Echinus acutus. Doror^idaris papillat 
 pustulosa. 
 
 Class — Holothuroidea (Sea-cucumbers) 
 
 jchirote Holothur 
 
 IV. TYPE— VERMES (WORMS) 
 
 Class — Platodes 
 
 Order — Trematoda 
 Series I. Charl fi2. Triatomum cocoieum, T. papiliosuni, GjTOdactylus elegans, Polystomum intoeerrinium, Octobothrium 
 laneeolatum, Diplozoon paradoxum, Dipora. 
 " Chart 33. Diatomum hepaticum, Distomum laneeolatum. 
 
 " Chart 73. Diatomum macroatomum, D. clavigerum, Cercaria macrocerca, D. cohinatum. 
 
 Order — Cealoda 
 " Chart 15. Taenia saginata. Taenia solium. 
 
 " Chart 44. Bothriocephalus latus, Tetrarhyccliidae, Caryophyllaeus mutabilis. 
 
 " Chart 99. Development of Taenia echinoacoccus, adult Taenia, genital organs of a young segment, Cysticercua condition 
 Coenurua cerebralis; Taenia serrata; Cysticercua piaiformia, headhooks on the Cyaticercus, head young 
 Taenia aerrata; development of the Cystoid tapeworms, Taenia cucumerina. young segment of s 
 Cysticeroid egg of same '^— '= -_■-_■_ _._ 
 
, Zoolog, 
 
 Chai 
 
 y, Leuckart-Chun (cuiitinucd) 
 
 PI an aria polychi 
 
 Chart 39. Nem 
 
 Order— Turbellarla 
 
 >a, Deiidracoelum laoteuin, Euryle 
 linearc. 
 
 Order — Nemertca 
 
 Amphyporus lacUfloreus, Tetrnal 
 ?us obscurus. 
 
 1 i\:^^ 
 
 IfjpriK 
 
 i 1, Chart 3 
 Chart Ri 
 
 s r, Chart 5 
 Chart 5 
 
 Pilidi 
 
 Class — Nemathelminthes 
 
 Order — Nematoda 
 
 Aacaria lumbricoides, Qxyurus vermicularia, Dochm: 
 
 tinalis. 
 Trichocephalus diapar, T. afEDia, Trichosomum crasaicauda, Trichina spiralis, mea 
 Heterodera schachtii. 
 
 O rder — Acant hoce pha I a 
 I. Male Echinorhynchus gigaa, male Ecliinorhynchua anguatatiis, female geuital 
 nephridea of same, oviduct of E. angustatus, and llgamentum suspensorium, s 
 of E. moniliformis, embryo of E. gigas and of E. angustatus, larvae. 
 
 V. TYPE— ANNELIDA (ANNELIDS) 
 
 Class — Chaetopoda 
 
 Order— Pol)cha€ 
 
 duodenalia, D. trigonocephalua, Atiguillulu intes- 
 taining Trichina. 
 
 Seri.-s I, Chart 
 
 itedi, Nereis puleataria. N. strioluta, Alciopa can 
 
 I':jvllochaetopteras major, Spirorbis laevis, Serpiila vermicularia, 
 
 I rulius proteiisua, Myxicola infundibulum. 
 Oliudchaeta 
 ■riudnlus latuuni, Lumbricua coiiiniuiiia, L. olidii.'j. l.iiTnljrirna trape- 
 
 Class — Hirudinea= Discophora 
 
 21. Hirudo niedieirialis, Pisciola. 
 
 Class — Gephyrea 
 
 Orders— Sipuncutoidea, Echiuroidea 
 
 50. Sipunculua nudus, Echiurua pallasi, Boaellia viridia, Sterriaspis spinosus, Attii.otrocha-larva «l I'hororiis. 
 
 Class — Rotifera, incl. Gasterotricha 
 
 51. irydatjna aenta. Stephanoceraa eichhorai, Mellcerta ringen.i, Rotifer vulgaris. IS'otornmala ai«bi>liii, Chae- 
 
 VI. TYPE— MOLLUSGOIDEA 
 
 Class -Bryozoa 
 Orders — Endoprocfa. Ectoprocla 
 34. Pedicelliiia echinata, Plumatella repens, stages of slatob lasts of Alcyonella fungosa in section, Alcyoriidium 
 mytili, Bowerbankia densa, Acamarchis avicularia, Flustra membrauacea. 
 
 Class— Brachiopoda 
 Order- Teslicardines 
 
 il^. Wal'llieirjiia a1l^if^ali^, and anatomy, Terebratula vitrea, Argiope neapolitana, larvji, Torobratiiln minor, 
 
 Argir^pe koivnievskii: 
 
 Lifjgula analina, and Order — Ecardines 
 
 101. Linculu anatma,— Anatomy in detail. 
 
 Series I, Char 
 
 VII. 
 
 Margaritana marg 
 
 Ostrea edulis, — loi 
 
 corpuscles, ba 
 
 Pecten jacobeus, ^ 
 
 TYPE— MOLLUSCA (SHELL-FISHES) 
 
 Class — Lameilibranchiafa (Bivalves ) 
 
 Order- Asiphonida 
 
 of larva ready to swnrin, side view of 
 1 mature eggs, 
 lus gaederopus. 
 
 Pholadidea. Terciio a 
 
 mpincoruni . 
 
 " Chart S9. Cardium tuberculatum, pcricardiiLl cliambcr of Venus v 
 
 Trigonia, Chondrophore of Mya truncata. 
 
 Class — Scaphopoda (Tooth shells) 
 
 Series I. Chart 92. Anatomy and developm.ent of Dentalium entails. 
 
 Class — Gastropoda (Univalves) 
 Order — P ul mo nata 
 
 Seric.sl, Chart ,30. Anatomy of Helix pomatia. Helix ncmoralis, Limnae stagnahs, i 
 Order — Opislhobratichiata 
 " Chart 8. PontolimaK capitatus, /Eolis, Dori,i, Polycera quadrilineata, Pleurobratichus, Aplysia punctata. 
 
 Orders— Pleropoda and Hetcropoda 
 " Charl 43. Creseis acicula. Cyinlnilia peroni, larva, Cliorje borealia, Clionopsis krohni, larva of Clione and Pueumo- 
 
 dermon, Pirola (Pterotrachea) coronata, Firoloides lesueuri, Atlanta peroni. 
 
 Class — Cephalopoda 
 
 Orders — Tetrabranchiata and Dibranchiata 
 
 latomy of Octopus vulgaris, head-cartilage of Sepia officinalis, brain of Sepia, section through eye of 
 
 Sepia and of Nautilus pompiliua. 
 lutllu-i pompilius, Spirula prototypus, shell of Spirula peroni, male Argouauta argo, female of same. 
 
 hectocotylus of Octopus carenae, s perm atop h ore of Sepia officinalis. 
 
 VIII. TYPE— ARTHROPODA 
 
 Sub-type^Branchiata 
 
 Class— Crustacea 
 Sub -class — Entomostraca 
 
 Order— Phyliopoda 
 
 , Charl 14. 
 Chart 3G. 
 
 Seriea I, Char 
 
 aus eancriformia, Apua prouet 
 
 Order— Copepo da 
 
 mthocamptus miautu.s, Cyclops canthocarpoid 
 Order— Cirripedia 
 
 stagnali! 
 i. Cyclui 
 
 Daphnia pulex, Polyphemus nculus. 
 
 , Acht.erea percarum. Argulus Foliace, 
 
Charts. Zoology, Leuckart Chun (co tnuei 
 
 Series I. Chart 87. Anato v in i e e opment 
 
 C 'pris stage, 
 
 t e Batanidae,— 
 
 Ibla cumingi. 
 
 the Sa.ccuUDS, 
 
 Series I. Char! 95 
 
 Sub-clasb — Malacostraca 
 Order^Slomatopoda 
 
 S.-|iiill3. iuaiiUs— Adult, 3ir]<> v.,>iv, l.a-k vi^,'.v rn 
 parts, three ataees in drv.-\- ;■ I . i.HniLii 
 
 iarva, older Squilloid 1; 
 
 1 through abdomen. 
 
 Chart 91. Macrurn— Larval his 
 
 jlopei 
 
 ; Z'..., 
 
 , r>unge3t Zoea stage, older Zoea larva, older Panaeua larva, 
 cnapoda, oE Galathea. of Pagurua; young Homarua and 
 . — Youngest Zoea of Thia, older Zoea of Maia. 
 
 of cephalo thorax, mouth parts, stomach, cirou- 
 thioLiglj eye, in 
 
 Chart 
 Chart ) 
 
 ■nhryo; Porcellio acaber,- 
 lale and female, ventral 
 
 Chart 
 Chart 
 
 larva; larva of Ast; 
 
 Astacus buviatllia, — Longitud. ._ __ . . . _ .... _. . 
 
 latory system, male genital apparatus, female genital apparatus. 
 
 Order — ^Arthrostraca 
 
 Sub-orde r— I sopo da 
 
 AseDus aquaticus, — male, central nervous system, female, anatomy, 
 
 groups of segments, incubatory pouch. 
 Entoniscidiae, — Development of Cepon elegans, second larval form, 
 female, dorsal view; Postunion maenadis, P. kossmanni. Cancrion miser. 
 Sub-order—Amphipoda 
 4. r.nm.narus ncslecUis. Phronima aedentaria, Cafirella- 
 
 Class — Acerata 
 Sub -class — ^Merostomata 
 
 O rder — Xi phosu ra 
 
 90. LiiiMiliL^ polvphemus,— Longitudinal section of body, transverse section of cephalotli 
 Liniiilua, circulatory and nervous systems, genital organs, young Limulua. 
 
 Sub-class — Arachnida 
 
 Oiders — Scorpianida, Pseudo scorpion! da, Cyphophthalmida 
 
 45. Inner structure of Buthus; Buthus afer, B. occitanus, Scorpio italicus, Chehfer cancroic 
 audeticum. 
 
 O rder — A rane i da 
 42. Inner structure of a female dipneumonic Araneid; Bpeira diadema, Segestria senoculata, 
 calophylla, Anyphaena accentuata, Philocea domestico, Agalena labyrinthica. 
 Order — Acarina 
 48. Metamorphosis of Trombidium fuliginosum; Tyroglyphua siro. Trie ho dactyl us anonym 
 58. baicoptes scahei var. hominis, S. mutans, Chorioptes apathiferus, Psoreotea longiroatri 
 serinus; Desmodex folliculorum. 
 
 Order — Linguatulida 
 G3. Linguatula (Pontaatomum) taeuiodes, I'entaatomum denticulatura, P. torquatam, P. m 
 
 Sub-type — Tracheata 
 
 Class— Prostracheata 
 Class — Myriopoda 
 Orders — Chilopoda, Symphyla, Paurnpoda 
 ,■52. f.ithobius forficatus, Scolopendra horiida, S. complaii; 
 
 Orders — Diplopoda, Onychophora 
 38. Polodeamus complanatus, Lysiopetalum insculptuin, 
 
 <"'laps Insccta 
 
 
 Scolopendrella, Pauropua. 
 
 la, Glomeria marginaLa, StroDgylo- 
 
 Charl 
 Chart 
 Chart 
 
 Migratory locust, il 
 Pelariua. Ephennr 
 Terraes lucifugn-, 
 
 ii'nlv of Acridiuni tartaric 
 
 ■. \5rinn puella. 
 
 ■ r -■ Tfriiies from Java. 
 
 17. Phylloxera vasl^ ■■■! 
 
 pupa. Map 01 I I ■ ■ r 1 ■' 1 
 
 9. Megaloptera, Chrjsopa Havifrona, Tricho 
 Order— Colepptei 
 
 G. Potato beetle (nor\|.Kor;i ilrii.'iniidi'ala). 
 
 ■;;,ll3 of Phylloxeri 
 I king generation a 
 I of Phylloxera. 
 
 „ Strcpaiptera. 
 
 Chart 78. Hyleainus piniiiiT.I. 
 gaster scolytiis, ' 
 Chart 84. Organs and met^im. 
 
 Chart 70. Musea (CsUiphora 
 
 Chart 21. Cabbage Butter(l\ 
 glands, etc., hi.':nl 
 wings, aUmenl;ii 
 
 U. Galls, adult ins.r 1 
 
 27. Honey bee (Api- r 
 
 97. Anomolon circum' 
 
 Platy gaster. 
 
 ■os^raphus, galleries in trunk of a fir 
 ■i;in May-beetles (Melolontha 
 i.i. I arnaria. Musca domestica. 
 
 1 gar is 
 
 !, Bostrichus laricis, Eccopto- 
 Lud M. hippocastani). 
 
 Chart 
 Chart 
 Chart 
 
 . , Midi (Cassus liguiperda), caterpillar of Bombys pini, ailk 
 
 ii. head of imago of Sphinx pinastri, scales from butterflies' 
 
 i.l.iLi.v atropos, egg of Smerinthus populi showing mioropyle. 
 
 -Wa'ips of the oak. 
 
 . pini, Microgaster 
 
 Series I. Char 
 
 IX. TYPE— GHORDATA (VERTEBRATES) 
 Sub- type — Acrania 
 
 Class— Hemichordata 
 
 :t. Balauogloasus kowalcwskii, — Development, organization of larva. 
 
 Class — Tunicata (Urochordata) 
 Sub-class — Copelata (Larvacea) 
 
 1. Appendicularia and tadpoles of Ascidiae, Oikopleura cophocerca. Stegoaom 
 
Charts, Zoology, Leuekart-Chun (contiQaoll 
 
 Sub-class — Ascidiacea 
 
 Ser[es I. Chart 53. Anatomy of Ciona inU'stiNulia, Corella parallelogra 
 the siiiirilo Ascidians. 
 
 — Thaliacea 
 
 Salpil pinnata, S: 
 Class — Cephalochordata 
 
 I, ClavellLi.alc paditor 
 
 Chart .in, Dolii.liim i.jilll 
 Chart 72. Devflopmfinl, ■ 
 
 Am Ohio 
 
 Sub- type — Graniata 
 
 Class — Pisces 
 
 Series II, Chart 1. Elet'tric organs of Torpedo mariiiorata, Gymnotua elei 
 organa of Mormyrua and Hiija clavatu. 
 
 Order-Klasmobranchii 
 Series II. Charl 2. EmI.ryonLc (IcvoU.i'-n -n' ■. .'. .■■i..-i.niiata: Belfour'a 3l 
 
 I Malapterurus elec 
 
 sof A,vr.tl.. ■ ,..i- -J.le view of skull of Notiiiaiaisi uinereua, tooth ol 
 
 Acanthlas and of 
 
 Order— Dipnoi 
 
 apecimena of COT^todua, Protoutenia annecteiis. 
 
 
 Class — Amphibia 
 
 
 Orders— Anura, Urodela 
 
 nic development of Rana tcmporaria and Triton, in detail, earlier ataj-ea. 
 nir dpvclnpmoiit of Rann temporaria, R. esculenla, Bombinator, and Triton, 1 
 
 Iter atagea (in con- 
 
 1 . ■ !■ ulenta and tigrina, details. 
 
 1 , - ' |.|..i . tmI Rana eaculanta, jaw of last, dissectio 
 
 1 of pyloric tract, 
 
 r Hysiem ol am phihia,— aorta nith oranchiae, heart and arteriea, venous syate 
 
 m.aection of heart 
 
 Chart 10. Var 
 
 Chart II. Into-siii.. 
 
 pli.r> 
 Chart 10. Vascular . 
 
 Chart 8. Nerve syatem, — brain and spinal cord of Rana temporal , 
 
 of larva of Bombinator igeneus, spinal cord of Rana eaculenta, a. 
 larval Triton taeniatus. 
 
 Chart 7. Urogenital syatem of Amphibia — segment canal from kidney of larval Siphonopa, urogenitalia of male 
 Rana temporaria and R. eaculenta jnd ol fem-ile of either ^peLits diagrams of male and female urogeni- 
 tal systema of Triton taeniatus 
 
 Class — Mammalia 
 
 Order— Pn mates 
 
 37. Gorilla eugena, skull of adult male UoriUa heii of adult n 
 on tang, head of Semnopithecua nasicui 
 
 [p Chimpanzee, skull ot an adult male Orang- 
 
 Chronograph, registering, with electric motor anil regulator after Tliur3', with three speeds, i.e., one 
 
 rotation every minute, one every ten seconds, or one every second; electro marking magnets 
 
 with two writing pens, all mounted on carriage with variable speed, A precision instrument 
 
 for the graphic recording of any laboratory experiments requiring the measurement of small 
 
 time. 
 
 Duty Free 300.00 Duty Paid 375.00 
 
 Chronoscope, Hipp, with two dials, reading to TiAioth of a second; clock-work operates for one minute. 
 
 Dut Free 96.00 Duty Paid 120.00 
 
 Chronoscope, Hipp, as above, but on wooden base with levelling screws. 
 
 Duty Free 90.00 Duty Paid 112.50 
 
 Chronoscope, Hipp, large model, operating 6 minutes from one winding; on column support. 
 
 Duty Free 156.00 ^. ^.. 
 
 Chronoscope, Hipp, as above, but on wall bracket. 
 
 Duty Free 144.00 
 
 Chronoscope, Ewald, for counting rapid interruptions in electric current, such as from an electrically 
 
 driven tuning fork, etc.; dial divided from 1 to 100; pointer may be set instantly to zero after 
 
 each reading. 
 
 Duty Free 50.40 Duty Paid G3,00 
 
 Duty Paid 195.00 
 
 Duty Paid.. 
 
 180.00 
 
24514. 
 24518. 
 
 24522. 
 24526. 
 
 Clamps. Bunsen, extension, of japanned iron, 
 holders No. 24518 and No. 24526. 
 
 Total length, inches 
 
 Wili talic tube, inches in diameter 
 
 No. 24526 
 
 For use with clamp 
 8 9 
 
 U 
 
 Each 40 
 
 .60 
 
 Clamps, Hitnsen, extension, of japanned iron, with one flat and one V shaped rubber covered jaw in the 
 small and medium sizes and two in the large size. For use with clamp holders No. 24518 and 
 No. 24526. 
 
 Total length, inches 7§ 9 10 
 
 Will take tube, inches in diameter 1 2 2J 
 
 Each 40 .60 .75 
 
 Clamps, Universal, extension, of japanned iron, with universal motion permitting its use for articles 
 of irregular shape. Especially recommended for use with condensers and retorts. For use with 
 clamp holder No. 24518. 
 
 Total length, inches S 11 
 
 Will take tube, inches in diameter 1^ 3 
 
 Each 75 1.25 
 
 Clamps. Hoffmann, extension, with one flat and one V shaped jaw, covered with rubber, the flat jaw with 
 parnllel motion. Total length 9j inches. Will take tubes up to 1^ inches in diameter 40 
 
 Clamps, Ostwald, extension, of polished brass. Jaws will take tubes from I to 50 mm in diameter. 2.00 
 
 Clamp Holder, of japanned iron, with brass screws for attaching extension clamps, extension rings, 
 etc., to apparatus supports. 
 
 For supports up to, inches in diameter i f 
 
 Each ^20 ^ 
 
 Clamp Holder, of polished brass throughout, for supports up to 16 mm in diameter 1.10 
 
 Clamp Holder, same as No. 24518 but adjustable, for rods up to 5 inch in diameter 50 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 2I5S(; 
 
 24530. Clamp, of nickel plated brass, with rubbtr covered ja\\a 50 
 
 24534. Clamp, of stamped steel, with rubber covered jaws; adjustable by check nut to any angle. A widely used 
 
 and satisfactory clamp 40 
 
 24538. Clamp, of japanned iron. With rubber covered jaws held together by spring 55 
 
 24542. Clamp, same as No. 2453S but for two burettes 75 
 
 24546. " Hoffmann, double, of japanned iron, with one V shaped and one parallel moving jaw, rubber 
 
 covered 1.00 
 
 24550. Clamp, improved double form, with V shaped and rubber covered convex jaw 1.00 
 
 24554. Clamp, of brass, with widely separated jaws giving perfect support to burettes, etc 1.25 
 
 24558. Clamp, same as No. 24554 but double _. 2.00 
 
 24570. " of brass, adjustable so that burette may be held in vertical position no matter in what position 
 
 the upright support may be fixed. Single, for one burette 2.70 
 
 24574. Clamp, same as No. 24570 but double, for two burettes 4.35 
 
 24578. " for immediate fixation of burette and permitting graduations to be freely read. Single . . . 1.05 
 
 24582. Clamp, same as No. 24578 but double 1.70 
 
 24586. Clamp, of brass, with one parallel moving and one V shaped jaw for tubes up to 2} inches in diam- 
 eter such as condensers, etc 2.10 
 
 24590, Clamp, with screw for attaching to supports and brass hook for supporting apparatus 75 
 
 24594, Clamp, of japanned iron, with strong spring closed, movable jaw. A heavy serviceable clamp for 
 
 large burettes, etc 50 
 
 24598. Clamp, Lincoln, for two burettes Will fit any rod up to ^ inch diameter. Burettes are held perpen- 
 dicular and are easily removed; very convenient and rigid 75 
 
 24602. " of brass, nickel plated, for burettes. For screwing into wall or wood, so constructed that the 
 graduated part of the burette is not covered 40 
 
24614. 
 24618. 
 24622. 
 24626. 
 24630. 
 24634. 
 24638. 
 24642. 
 24646. 
 
 24658. 
 24662. 
 
 Nit. 24GG2 
 
 No. 2-1666 
 
 Clamp, ('haddock, [m- Imldinif bc;ikers. 
 
 riiae Small 
 
 For beakerSj mm in diameter 40-nil 
 
 Each 25 
 
 Clamp, Chaddock, for holding evaporating dishes. 
 
 Size _ Small Medium 
 
 I'^or dishes, inches in diameter 3 to 4 4 to 6 
 
 Each 
 
 Clamp, Chaddock, for holding test tubes and necks of flasks.. 
 
 of wood, with rubber spring, for test tubes 
 
 same as No, 24618 but with wire spring. 
 
 .25 
 
 Large 
 
 (iO-SO 
 
 .25 
 
 Large 
 6 to 7 
 
 Stoddart, of spring brass wire, 4J inches long, for test tubes 15 
 
 same as No. 24626 but of nickel plated steel wire 10 
 
 of nickel plated steel wire, for test tubes, improved form, 6 inches long 15 
 
 nickel plated, for holding crucibles and small dishes _ _4(l 
 
 " " German form, for test tubes ,40 
 
 Clamp, Hoffman, nickel plated, for rubber tubing, so-called "screw compressor," bimensions given 
 are for maximum diameter of tubing for which clamp is available. 
 Size, inches i i 
 
 Each " _2() 
 
 Clamp, Hoffman, for rubber tubing, nickel plated, with one swinging jaw. 
 
 ^faximum diameter of tubing, inches ,' 
 
 Each '.'............^5 
 
 Clamp, Hoffman, for rubber tubing, nickel plated with open jaw. 
 
 Maximum diameter of tubing, inches \ 
 
 Each., 
 
 .25 
 
 Clamp, of brass, nickel plated, for rubber tubing, extra heavy, I x 11 inches ^50 
 
 " Mohr's Pinchcock. of nickel plated spring wire (rectangular cross section) for rubber tubing. 
 
 Total length of clamp, inches 1| 2 2i 3 
 
 Each.. ^ 
 
 10 .15 .20 .25 
 
 Clamp, Mohr's Pinchcock, for rubl>er tubing, same as No. 24662, but with automatic catch to hold 
 clamp open. 
 
 Total length of clamp, inches 2 2J 3 
 
 Each " 25 .30 i35 
 
 Clamp, of brass, nickel plated, for watch glasses. 
 
 For watch glasses, mm in diameter 50 65 
 
 Each .15 
 
 Clamp, of malleable iron with steel screw for fastening apparatus to table. 
 
 Length, inches 3 4 5 
 
 Each ~M ^40 ' ~l50' 
 
 .20 
 
246S2. 
 24686. 
 
 24710. 
 24714. 
 
 No. 247oe 
 
 N» 34710 
 
 No. 2-1690 
 
 id 10 ] 
 
 ■ uf this clauip 13 that 
 m, i. e., thermometers, 
 iviatiDg the use of any- 
 lit in stock to fit verti- 
 
 Clamp, for therniu-U' n ■ 'i-;rif 
 
 the same spriii_ ,■ I !■ ' ■ '■ 
 
 etc., serves al-' .i' 
 
 screws. The rljnq.^ :ii .■ ( 
 
 cal supports of uiiu, S i 
 
 To fit support, mm S 10 
 
 Each "" .90 .90 ~ ~90 
 
 Clamp, as above, with handle, for holding test tubes, small flasks, etc 1.15 
 
 Extension Holder with clamps as above to fit 6 mm support. 
 
 Number of clamps 1 2 
 
 Each ~ 'TjO 2.00 
 
 Clock (Thayer Interval Timer), new model with l>c'll entirely enclosed m brass case. Very convenient 
 
 in timing continuous laboratory operations. 4.75 
 
 COLOR TESTING APPARATUS. 
 
 and manganese in steel by the colorimetric 
 30 50 
 
 Color Comparison Tuhes, Eggertz. fur the estimation uf 
 method. 
 
 Capacity, cc 
 
 (iraduated in, cc 
 
 Per set of two .^2.50 2?75 
 
 " " " four _. 5.00 5.50 
 
 Color Comparison Tubes, Julian, same as No. 24702 but with bent ends. The bent end permits the 
 mixing of the contents without the use of a stopper in the tube. The lower portion of the tube 
 iff ungraduated. 
 
 Graduated from, cc 5 to 30 10 to 50 
 
 Graduated in, cc 1^ -^ 
 
 Per set of two ~ 2.75 3.00 
 
 " " " four 5.50 6.00 
 
 Color Comparison Tubes, Camp, for manganese determinations. 
 
 Per set of two ' 6.00 
 
 Color Comparison Tubes, Nessler, of special colorless glass, usual form. Height of 50 cc mark in 50 cc 
 tubes 120 mm, height of 100 cc mark in 100 cc tubes, 150 mm. 
 
 Graduation, cc 50 10 50 and IQQ 
 
 Each .50 .60 .70 
 
 Color Comparison Tubes, Nessler, American Public Health Association. With polished bottoms and 
 50 cc mark 210 mm high on 50 cc tube, and 100 cc mark 325 mm high on 100 cc tubes. Tubes 
 in selected sets of six or twelve guaranteed to have either 50 cc or 100 cc marks within 6 mm of 
 same height. See American Public Health Association "Standard Methods of Walcr Analysis," 
 1912. 
 
 Graduation, cc _ 50 
 
 Each _ .50 
 
 Per set of six 3.15 
 
 " " " twelve 6.60 
 
 100 
 
 9.90 
 
 50 and 100 
 .90 
 
 5.70 
 11.90 
 
ARTHUR H. THOMAS COMPANY 
 
 Lt.,, P 
 
 24722. 
 
 2472fi. 
 2473(1. 
 
 24732. 
 24734. 
 
 :^4739. 
 247 K), 
 
 Stand for Nessler Tubes No, 3171S, of wood painted a dull black, with boUom lined with opal glass 
 plate. For twelve 50 ce tubes 4_5() 
 
 Camera, for comparing color comparison tubes .such as No, 2i71S, etc. Improved form with blue and 
 ground glass ^qqq 
 
 Colorimeter, Rowntree and Geraghty, designed especially for accurately estimating the functional 
 abdity of the kidneys and for the determination of the relative efficiency of each kidney when 
 the Hccict ions are sepai'atcly collected by the Phenolsulphonephthalein Test. In wooden case, 
 
 wilhout urtiimuk'.'^ of Phenolsidphonephthalcin 20,00 
 
 Sterile Ampoules of Phenolsulphonephthalein, 10 in box ....'....'.'.'.'.'.... 1,00 
 
 Colorimeter, Dunning, for estimating the quantity of phenolsulphonephthalein excreted when apply- 
 _ Lng the IJowntree and Geraghty Renal Functional test. Complete in polished wooden case. 5.00 
 
 tolonmeter, Schreiner,as used m the U. S. Bureau of Soils. All working parts coming in contact 
 with the sample or standard are of glass. Broken parts are easily replaceable. See Journal of 
 the Anicncan Chemical Society, Sept. 9, 1905, and Bulletin I^o. SI of the U. S. Deparlmenl oj 
 
 Af/riLnlliiTp. Bureau of Soils 15.00 
 
 Graduated tubes for above, per pair [' ' ' ^'qq 
 
 Plain tubes for above, per pair * ' ' gg 
 
 Colorimeter. Kennicott— Campbell-Hurley. This instrument is used in theanalvsis of water,' determJiia- 
 tion nf ,.;ulion m steel, titanium metal, etc., and for the color variations of dye stuffs. See 
 Journal of the American Chemical Society, July, 1912 20.00 
 
24746. Colorimeter, Duboscq, original Freaeh make. A standard instrument for a great variiity of work and 
 as used in physiological chemistry in the determination of the total nitrogen in urine, non-protein 
 nitrogen, urea and ammonia in blood, urea in urine, etc., by the methods of Dr. Otto Folin. 
 
 Height of tube, cm 5 10 
 
 Duty Free 56.2o 77.50 
 
 Stock 81.00 111.60 
 
 247.50. 
 
 Extra Glass Tubes, for Duboscq Colorimeter. 
 
 Height of tube, cm ') 
 
 Each, from stock 3.00 
 
 10 
 4.25 
 
 Colorimeter, Duboscq, original French make, same as No. 34746 iaiit with longer tubes and with liori- 
 zontal reading telescope for convenience of operator. 
 
 Height of tube, cm 20 30 _ 35 
 
 Duty Free 100.00 125.00 " 137.50 
 
 Duty Paid 144.00 ISO.OO 200.00 
 
 Colorimeter, Duboscq, origuial French make, small size, for biological investigation of blood, serums, 
 etc., where only small quantities of solution are available. Determinations may be made with 
 less than 1 cc of solution, as furnished by us to Harvard Medical School, Cornell University, 
 University of Pennsylvania, etc. 
 Duty Free 37.50 Stock 54.00 
 
 Colorimeter with Polariscope (Polarisation-Colorimeter), with (irosse prism combination. See Zeit- 
 schriftf. phy-iik. Chra. 10. 165, 1S92. 
 Duty Free 57.00 Duty Paid 76.00 
 
 Colorimeter with Spectroscope (Spectro-Colorimeter), Kriiss with ocular slit ami device for accu- 
 rately measuring location in spectrum. See Kruss Kolorimeler S. 1^1 u. Zeitschrift f. Physik. 
 Ckemie 10. 165, 1892. 
 Duty Free 75.00 Duty Paid 100.00 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 24770— Seclioni 
 
 24770. Colorimeter-Chromoseope, Arons, for physiological and psychological work as well as the measure- 
 ment of colors of paper, leather, yarn and other substances. See Annalen der Physik, Band 
 3S. 1910 and Brnui 39, 1912. Reprint in German sent on application. 
 Duty Free 4''0 00 Dul Paid .'iSS.OO 
 
 r^ 
 
 •* ^--r^ ,T, 
 
 Jl, |l|l1!'>-2- 
 
 Colorimeter, Precision, Nutting, as used in the U. S- Bureau of Standards. This Colorimeter is 
 a monochromatic analyzer of wide range, high precision and great simplicity. The use of 
 arbitrary reference standards, such as red, green and blue, is eliminated, the reading beiag 
 given directly in wave length and per cent white. Light of a pure spectral hue may be mixed 
 with white light to match the unknown, or, in the case of purple, mixed with the unknown to 
 match white. The comparison is made by means of a Lumraer-Brodhun prism. See Bulletin 
 of the Bureau of Standards, Vol. 9, and Zeitschrift fur Tmhumentenkunde 1913, Januar. 
 Duty Free 202.50 Duty Paid 270.00 
 
Color Tester, Zeiss, with color scale, for accurate color comparisons of opaque uiatcriaU, solutions, 
 etc. 8cc Chemiker-Zeitung 1912, S. 853. Bd. S6. 
 Duty Free 50.00 Duty Paid 68.00 
 
 Colorimeter, Stammer, designed especially for use in the sugar industry, (.'onstvucted entirely of 
 nf metal, with tubes 260 mm high, and with four standard colored glasses. 
 Duty Free 52.50 Stock 70.00 
 
 Colorimeter, Stammer, constructed of metal throughout with tubes 350 mm high. Especially de- 
 signed for use in testing petroleum and other mineral oiis. Arranged for convenient deter- 
 minations of market grades of oil such as Standard White, Prime White, Superfine White and 
 Water White. With two Uranium Normal glass discs. 
 Duty Free 78.00 Stock 104.00 
 
 th two jars, for use with No. 
 
 Immersion Tube nf i;lass, 
 247S0. 
 
 Duty Free 12.60 
 
 Stock 17.50 
 
 Uranium Glass Plates for petroleum work for normal and half 
 norma! colors. 
 
 Duty Free, each , 4.35 
 
 Stock, each 6.00 
 
 Normal Glass Plates, for beer, sugar and other work. 
 
 Duty Free, each 1.10 
 
 Stock, each 1.50 
 
 Colorimeter (Chromophotometer) Plesch, Model I, as used in 
 biological chemistry and described by Plesch "Haemo- 
 dynamische Sludien," Berlin, 1909, and as used in the 
 Laboratory of Physiological Chemistry, University of 
 Pennsylvania. With two color tubes fitting one into the 
 other, Lummer-Brodhun prism, trough, comparison 
 prism, etc., with horizontal telescope and camera. 
 
 Duty Free 127.50 
 
 Duty Paid 170.00 
 
24S.i4. 
 2185S. 
 24862. 
 
 24866. 
 
 Duty Paid 3.00 
 
 Duty Paid 5 00 
 
 Duty Paid 5.00 
 
 12.00 
 
 9.00 
 12.00 
 
 LOVIBOND'S TINTOMETER 
 
 Not€---Bi_'C;iusf.' of the p;re;it variety of combinations possible we do not carry these outfits in stock. 
 
 ]Jeliver>- can bt made by importation usually in from three to five weeiis. Manufacturer's original 
 
 publication witli full descriptive matter sent upon request. 
 24S06. Colorimeter (Lovibond's Tintometer) improved optical instrument for both monocular and binocular 
 
 vision. 
 
 Duty Free 12.60 Duty Paid 16.80 
 
 24S10. Colorimeter (Lovibond's Tintometer^ ojDtical instrument, monocular only, arranj^ed in case for factory 
 
 use to prevent standards from being handled. 
 
 Duty Free 18.90 Duty Paid. 25.20 
 
 24x14. Colorimeter (Lovibond's Tintometer) improved optical instrument with hot water attachment for 
 
 liquidating solids below 212° F. 
 
 Duty Free 22.50 Duty Paid 30.00 
 
 24SIS. Complete Set of Standard Glasses for Lovibond's Tintometer, 470 glasses in set for matching all colors. 
 
 Duty Free 282.00 Duty Paid 376.00 
 
 Accessories for Lovibond Tintometer. 
 24,s22. Extra Shoe, to carry cells up to 6 inches. 
 
 Duty Free 2.25 
 
 24826. Stand for either No. 2480fi, 24810 or 24814, 
 
 Duty Free 3.75 
 
 24830, Stand, rigid, with support, to take cells up to two feet. 
 
 Duty Free 3.75 
 
 24834. Extra Support, making the above suitable for cells of any length. 
 
 Duty Free 2.25 Duty Paid 3.00 
 
 24838. Mirror, white reflecting, for long troughs. 
 
 Duty Free 3.75 Duty Paid 5.00 
 
 24842. Mirror, white reflecting, mounted on jointed brass stand. 
 
 Duty Free 9.00 Duty Paid 
 
 24846. Metal Trough, with glass ends either silver plated or of brass, 
 
 Tiauged, inches A 1 I- 
 
 Dutv Free 3.00 3.75 7.50 
 
 Duty Paid 4.00 5.00 10.00 
 
 Combination Outfits for specific purposes. 
 218,i0. Lovibond Tintometer Set for brewers, maltsters, sugar and caramel manufi.cturers, wine and spirit 
 
 merchants, etc., including the improved optical instrument No. MSOG box with stand and re- 
 flector, 1 inch, and j'g inch silvered cells, filtering apparatus and 20 standard glasses, series 52 
 
 and 50; as recommended by the Council of the Institute of Brewing in their Malt Analysis Report 
 
 "Colored Malts and Caramel." 
 
 Duty Free 37.50 Duty Paid 50.00 
 
 Extra Apparatus for estimating the color of dry malt, consisting of 83 standard glasses, with trays, pres- 
 
 ser and standard white. 
 
 Duty Free 17.40 Duty Paid 23.20 
 
 Lovibond Tintometer Set for estimating the color in water, including themonocular optical instrument 
 
 No. 24810, box with supports and reflect'^, 2 ft, and 1 ft. brass cells and forty standard glasses. 
 
 Duty Free 63. GO Duty Paid 84.80 
 
 Lovibond Tintometer Set for estimating percentage of Ammonia in Nessler's Ammonia Test, including 
 
 the improved optical instrument, No. 24806, box with stand and reflector, ^ inch glass cell, with 
 
 30 standard glasses. 
 
 Duty Free 36.00 Duty Paid 48.00 
 
 Lovibond Tintometer Set for estimating Carbon in Steel, including the improved optical instrument 
 
 No. 24S06, box stand and reflector, ! inch cell and 34 standard glasses series 52, and 26 glasses 
 
 series 50. 
 
 Duty Free 48.00 Duty Paid 64.00 
 
 24870. Lovibond Tintometer Set for estimating the color in oils, waxes, lards and other fats, varnishes, gela- 
 tine, scale, etc., including the improved optical instrument fitted with hot water attachment 
 
 for melting solids, No. 24814, thermometer for taking their melting point, box, 1 inch, ^ inch 
 
 and I inch silvered cells, without standard glasses. 
 
 Duty Free 40.50 Duty Paid 54.00 
 
 24874. Lovibond Tintometer Set, simple form, for estimating color in cotton seed oil, fitted with standard oil 
 
 bottle and compound glass and set of 24 standard cotton seed oil glasses. 
 
 Duty Free 20.40 Duty Paid 27.20 
 
 24878. Lovibond Tintometer Set, for estimating the color in cotton seed oil, including the improved optical 
 
 instrument No. 24814 fitted with lamp and hot water attachment for liquifying the oil and 
 
 maintaining a given temperature, 5| inch cell and 36 standard glasses. 
 
 Duty Free 57.00 Duty Paid 76.00 
 
 24882. Lovibond Tintometer Set for standardizing merchantable petroleums, including the monocular optical 
 
 instrument No. 24806, box with stand and reflector, 18 inch silvered cell, 4 special standard 
 
 glasses for water white, standard white, superfine white and prime white. 
 
 Duty Free 33,00 Duty Paid 44.00 
 
 24886. Extra Apparatus for Intermediate, Russian and Lubricating oils, containing tV inch silvered cell and 
 
 -5 additional standards. 
 
 Duty Free 9.60 Duty Paid 12.80 
 
 24890. Lovibond Tintometer Set for estimating the value of flour, including the improved optical instrument 
 
 No. 25S06. standard white, 6 trays, pressing apparatus and 90 standard glasses. 
 
 Duty Free 63.00 Duty Paid 84.00 
 
 24894. Lovibond Tintometer Set for estimating the coloring matter in tanning solutions, consisting of binocu- 
 lar instrument in polished box, with stand and reflector, 5 cm anci 10 cm glass cells and 88 standard 
 
 glasses. 
 
 Duty Free 64.50 Duty Paid 86.00 
 
ARTHUR H. THOMAS COMPANY 
 
 ,^v—-'n ,..- 
 
 ,o---, ...rrwr- 'IJ^^ 
 
 V^ r 
 
 Nil. 
 
 ...^^^ 
 
 24910. Combustion Boats, Koyal Meissen Porcelain. 
 
 Lengtli, nini W 75 75 100 llo 145 
 
 Width, mm lU 11 1') 18 13 14 
 
 Each 15 .15 .15 .25 .25 .30 
 
 24914. Combustion Boats, Opaque Silica, glazed, without biindle. 
 
 Length, inches li ■' ^ 4 
 
 Width, inches I ? s « 
 
 Each 50 .75 .90 1.15 
 
 24918. Combustion Boats, Alundum, adaptable to a great variety of work, but particularly designed for the 
 determination of carbon in iron and steel. The boats may be used repeatedly because the alun- 
 dum does not react with the iron oxide in the sample. Shapes have been carefully designed by 
 practical chemists. _ .^ 
 
 Length, inches 3j ^i ''rs ^ '"'? 
 
 Width, inches i s n: ^4 i 
 
 Depth, inches ^ » ts ts tj 
 
 Each 30 .35 .50 .40 .40 
 
 24922. Alundum Cover for Combustion Boat No. 24918, i^^ inches long x ^ inch wide 75 
 
 24926. Combustion Boats, Johnson, of clay 10 
 
 24930- R R Alundum, for use with combustion boats of either platinum or siliceous material.? and particuUuly 
 recommended for alundum boats, increasing their durability and preventing their destruction 
 during combustions. Consists of pure crystalline Alumina and is supplied in granular form of 
 No. 60, 90 and 120 mesh for use in the determination of carbon in steel. Please specify me.sh in 
 ordering. In glass stoppered bottles. 
 
 Size bottle i l'^. 1 lb. 2 lbs. 
 
 Each 40 . -75 1-50 
 
 24934. Combustion Capsules, Royal Meissen Porcelain, without lip, as used in coal analysi-s. 
 
 Diameter, mm "^0 w 
 
 Depth, mm 22 30 
 
 Each 20 .20 
 
 24938. Combustion Tubes, Alundum, to withstand temperatures of approximately 2000° C. These tubes 
 are made gas-tight by glazing without sacrificing their refractive quality; in 2-1 inch lengths. 
 
 Inside diameter, inches a 4 1 
 
 Each 4.95 4.95 4.95 
 
 24942. Combustion Tubes, Sanitats Porcelain. Glazed inside and outside. In 60 cm lengths. 
 
 Inside diameter, mm 15 IS 22 25_ 
 
 Each 1-60 2.00 2.25 2.75 
 
 24946. Combustion Tubes, Royal Berlin Porcelain, glazed inside and outside. Will staml a temperature of 
 1100" C. and are paractically gas tight. In 60 cm lengths. 
 
 Inside diameter, mm _l^ -Q r^ 
 
 Each 4-50 5.40 7.20 
 
 24950. Combustion Tubes, Marquardt Mass, for temperatures up to 1650° C, These are furnished either 
 glazed or unglazed. In 60 cm lengths. 
 
 Inside diameter, mm 1^_ 20_ 
 
 Each 4.00 4.75 
 
 24954 Combustion Tubes Opaque Silica, for temperatures up to 1500° C. Tubes of the following diameters 
 are carried in stock in 2 ft. lengths but tubing from ^ in. to 2 m. inside diameter can be fur- 
 nished in lengths up to 8 ft. ; 24 in. long x | in. inside diameter is the standard tube for Hoskins 
 Combustion Furnace No. 28988 ^ 
 
 Inside diameter, inches ^ ^ . .s i 
 
 Each, unglazed 4.20 4.60 5.00 
 
 Each, glazed on outside and at one end 5.20 5.60 6.00 
 
 24956. C'ombustion Tube, Vitrified Clay, Johnson. When used with tapered clay connector below rubber 
 
 stoppers are unnecessary in carbon combustion work, etc. See Journal of Industrial d: Engi- 
 neerin'i Chemistry, July, 1913 3.00 
 
 24957. Tapered Connector, Vitrified Clay, for use with above 90 
 
ARTHUR H. THOMAS COMPANY 
 
 VANIER COMBUSTION TRAIN 
 
 COMIJl S1U>N I lt\IN, VANIER. for the Determinalion of Carbon in Steel bj the Direct Combustion Method 
 with Electric Furnace, consisting of the following: 
 H and H', 4 liter Aspirator Bottles for maintaining a constant pressure, H being filled with water. 
 
 A, Potash Bulb with caustic potash for purifying oxygen before entering tube. 
 
 B, Calcium Chloride Tube, for removing moisture from oxygen before entering tube, 
 
 C, Hoskin Electric Combustion Tube Furnace. 
 
 D, Glazed Quartz Combustion Tube, f inch bore and 2 feet long. 
 
 E, Vanier Zinc Tube for granulated zinc, to remove any trace of sulphur. 
 
 F, Vanier Sulphuric Acid Bulb, for absorbing moisture. 
 
 G, Vanier Combined Potash Bulb and Drying Tube. 
 
 The determination of carbon in steel is one of the principal duties of the Steel Chemist and when this analysis 
 13 made by the direct combustion method with the proper furnace and absorption train, it becomes one of the 
 most satisfactory analyses, both in point of time and in accuracy to be made in a steel laboratory. This com- 
 bustion outfit is the design of Mr. Geo. P. Vanier, r'hiof (.'homist of the Pennsylvania Steel Company, several 
 of the important components of the brain being specially designed by Mr. Vanier for this apparatus. With this 
 outfit one man can, with five outfits, maintain a rate of ten combustions per hour. An important feature of 
 the outfit is the Vanier Combined Potash Bulb and Drying Tube (Patented) Fig. G of the illustration. It offera 
 many advantages over the bulbs formerly used, i.e. — 
 
 Lsree tapacitv. Sii grams, or more, of carbonic acid can be absorhed. thus enablinu (herhemisi lo makeover 100 combustions wilh- 
 
 oul refilling. 
 No rubber caps are necessary when weighing nilh the bulb filled uilh oxygen as the glass stopcock closes the inlet and outlet. 
 Having a drying tube attached they are compact and more easily handled than the ordinary bulbs. 
 They have a smooth ouler surface which ia easily cleaned. 
 
 They are self-supporting and, having a firm base, can be conveniently placed on the balance pan when neiKhini;. 
 The drying tube being vertical, the moist gases pass in al Ihe bottom and the drying lube never stops up. \s (he solid caustic potash 
 
 deliquesces it forms a pool in the bottom ofihe drying lube thus making an eitra seal. 
 The easses can be passed at a high rale without loss ofCOi or moisture. 
 When gases are pa.ssed through rapidly Ihe action is perfectly quiel without any sprayini; or jump! nu of the solution. 
 
 249n8. Vanier Combustion Train, complete outfit aa illustrated, consisting of aspirator bottles li and H'; bulbs 
 A. B. E, F and G, Hoskin's Electric Combustion Furnace C, glazed quartz combustion tube D 
 rubber tubing, supports, clamps, glass rods, two Alundum combustion boats, 3' x ^ inches, and 
 
 J lb. of R R Alundum but without oxygen tank 42.00 
 
 24962. Vanier Combustion Train, complete as above, but with the addition of Hoskins Rheostat for regulating 
 
 temperature of furnace 50.00 
 
 Single Parts. 
 
 44732. Potash Bulb. A of illustration .50 
 
 23252. Calcium Chloride Tube. B of illustration 90 
 
 28988. Hoskin Electric Combustion Tube Furnace. C of illustration 25.00 
 
 24954. Glazed Quartz Combustion Tube, ^ in. bore x 2 ft. long. D of illustration 5.20 
 
 26656. Vanier Zinc Tube. E of illustration 75 
 
 26660. Vanier Sulphuric Acid Bulb. K of illustration 1.25 
 
 26664. Vanier Combined Potash Bulb and Drying Tube. G of illustration 3.25 
 
 24918. Alundum Combustion Boats. 3f in. x |- in., each 35 
 
 24930. RR Alundum. In 1 lb. glass stoppered bottle 75 
 
 24964. Factor Weight, 2,7273 grams, of lacquered brass. For weighing charge of boat 75 
 
Compression Pump, hand, for laboratory use in the compres- 
 sion of either liquids or gases. 
 P'or pressures up to, atmospheres . . , 300 1000 
 
 Duty Free 136.40 156.20 
 
 Duty Paid 173.60 200.00 
 
 Reservoir for the above, on stand for the Cailletet experiment 
 in the liquefaction of gases. 
 
 For pressures up to, atmospheres 300 1000 
 
 Duty Free 39.60 50^ 
 
 Duty Paid 50.40 64.40 
 
 Note:— Compressors for liquefying Air and Hydrogen of large 
 Capacity are listed under Liquid Air Apparatus, page 
 
 Compre'i&ion Pump for (he Determ nat on of Cr t cal Pressur h high pressure manometer mounted 
 
 un board, wuh six extra capillaiieb. ..te Phyi. ckem. Mess. Seite 228. 
 
 Duty Free 43.60 Duty Paid 59.40 
 
 Compression Pump, Ramsay-Young, for gases, consisting of an iron compression cylinder with screw 
 
 for pressure up to 200 atmospheres, with three tubulations for manometers, three calibrated and 
 
 graduated manometer tubes of English lead glass, two cooling jackets with thermometers, etc. 
 
 See Trarers. cxperimenlHlc Uniersiichuno ion Gasen piQ. 251 Braunschweig 1903. 
 
 Duty Free 90.75 Duty Paid 123.75 
 
^ 
 
 '= 1 
 
 1 f 
 
 1 
 
 \l \l 
 
 ll 
 
 r f 
 
 q 
 
 
 \ 
 
 /r 
 
 
 \ 
 
 / 
 I 
 
 I 
 
 ) 
 
 i 
 
 J ( 
 
 
 
 
 
 No. 250US No. 2^ 
 
 No. 25028 No. 25032 
 
 Condenser, of brass, with condensing tube of glass. With rubber stoppers. 
 
 Length, mm 300 37.5 .500 600 675 750 
 
 Each 3.00 3.50 3.80 4.20 4.50 5.00 
 
 Condenser, Liebig, of glass, with condensing tube in form of cpi! sealed in water jacket. 
 
 25024. 
 2.5028. 
 
 l.ensf h, ram. . . . ." ' 150 200 
 
 Each 1.25 1.60 
 
 Condenser, Liebig, with rubber connections. 
 
 Length, ram 250 300 400 
 
 Each .85 1.00 1.10 
 
 Condenser Tubes for above condensers, of glass. 
 
 Length, mm 250 300 400 
 
 Each 18 .20 .22 
 
 Condenser, Liebig, of gl.ass, with inner tube sealed to body. 
 
 Length, mm 2.50 
 
 Each .90 
 
 Condenser, Allihn, of glass, with bulb condensing tube. 
 
 Length, mm 200 
 
 Each ' 1.10 
 
 250 
 1.80 
 
 .500 
 1.25 
 
 500 
 .25 
 
 300 
 1.10 
 
 250 
 
 300 
 2.25 
 
 000 
 1.60 
 
 JjOO 
 .35 
 
 400 
 1.25 
 
 300 
 1.40 
 
 400 
 3.00 
 
 800 
 2.00 
 
 1000 
 6.50 
 
 1 000 
 3.00 
 
 500 
 1.65 
 
 400 
 
 600 
 
 1.60 2.40 
 
 Condenser, Hopkins, outside jacket 35 cm long. As widely used in Extraction .Apparatus. See 
 Journal of the American Chemical Society, December, 1908 1.75 
 
 Condenser, Hopkins, Picard-Law modification, which consists in the side tube being bent upright at 
 right angles with a funnel top so that extraction fluid may be poured into the condenser with- 
 out disconnecting the extraction tube when used in connection with extraction apparatus. 
 Widely used in cotton seed oil work 1.90 
 
 Condenser, Gockel, may be connected air-tight with receiver and used either as a reflux condenser or 
 for the determination of inflammable substances where dangerous gases must be led off from 
 inside. 
 
 I^ength of jacket, inches IS 24 
 
 Each 3.00 3.60 
 
 Condenser, .Sulphurous Acid, Liebig, of glass, with two stopcocks on horizontal tubes 2.25 
 
 fr^T 
 
 
 25040. Condenser, of glass, with spiral. 
 
 Capacity, cc 500 
 
 Each 
 
 25044. Tripod, of metal, for use with condenser No.2.5040. 
 
 For condenser, oc 
 
 Each 
 
 500 
 
 1000 
 
 2000 
 
 3.00 
 
 3.50 
 
 4.25 
 
 500 
 
 1000 
 
 2000 
 
 1.00 
 
 1.50 
 
 2,00 
 
ARTHUR H. THOMAS COMPANY 
 
 25048. 
 
 25052. 
 25056. 
 25060. 
 
 25064. 
 25068. 
 25072. 
 
 25076. 
 
 25080. 
 
 25084. 
 
 Condenser, of zinc, with lieavy blocl 
 For stiil of capacity, gallons.. 
 Each.. 
 
 For use with distilling apparatus such as No. 26548. 
 
 _!s_ _ r 2 3 5 
 
 5.00"" 
 
 __ 6.00 8.00 10.00 12.00 
 
 Condenser, Friedrichs, of glass, screw shape, with glass screw inside. See Zeihchrift fur angew. 
 
 Cliemie, 1910 ■, /■■■:■,■,■■, ^i y *■'"' 
 
 Condenser, Friedrichs, of glass, screw shape, with counter current device. Specially adaptable for use 
 
 as reflux condenser. See ZeiUchriJi fdr angevi. Ckemie, 19I£ ._ 5.00 
 
 Condenser, Mohr, of glass, with cork stoppers and tubing as shown in illustration. 
 
 Length.mm... 300 360 500 
 
 Each 1.00 1.25 1.40 
 
 Condenser, Soxhiet, spherical, of copper tinned inside, 4 inches in diameter 3.00 
 
 " " same as No. 25064 but with two bulbs 6.00 
 
 Condenser Support, consisting of Support No. 37668, with extra large rectangular base, large clamp 
 
 holder No. 24516 and large universal clamp No. 24508 2.60 
 
 Condenser Support, consisting of No. 37668 with extra large rectangular base and brass condenser 
 
 clamp No. 24586 3-00 
 
 Condenser Support, for condenser up to 60 mm in diameter, with double clamp of brass, on iron 
 
 tripod 6-00 
 
 Condenser Support, for condenser up to 60 mm in diameter, of iron, with double brass clamp 6.00 
 
ARTHUR H. THOMAS COMPANY 
 
 25122. 
 
 25126. 
 
 25130. 
 251.54. 
 
 Corks, XXX Quality, ie{;iil;ii- length. 
 
 Kmiiber 1 2 :) 4 6 II 7 8 9 10 
 
 Diameter at smal! end, inches i vg i rs s rs f H H s 
 
 Per 100 .15 .18 .20 .25 .30 .35 ..50 .55" " ^5 M 
 
 Number 11 12 13 14 15 16 17 18 
 
 Diameter at small end, inches tI s il 
 
 Per 100 ^85 .95 1.05 
 
 Corks, Special Laboratory Quality, re9;ular length. These corks are made for laboratory use and are 
 not regularly listed or designated in the cork trade and because of the wide selection necessary 
 to get homogeneous wood are much more exjjensive than any corks regularly on the market. 
 They are particularly recommended for use with extraction apparatus, etc 
 
 1 
 1.15 
 
 1.25 
 
 1.60 
 
 1.80 
 
 19 20 
 2.00 2.15 2.45 
 
 3 
 
 S 
 
 .80 1.00 1.20 
 
 1.80 2.00 2.25 2.50 2.75 3.00 3.25 
 
 17 
 
 .15 .1. 
 
 11 11 
 
 .15 
 
 13 
 
 .18 
 
 14 
 
 'l5 
 
 .30 
 
 16 
 
 * i- 
 
 1 
 
 lA 
 
 IS 
 
 lA 
 
 10 
 
 11 
 
 1 
 
 lA 
 
 1.40 
 
 1.60 
 
 19 
 
 ai 
 
 lA 
 
 « 
 
 3.50 
 
 3.V5 
 
 9 
 
 10 
 
 f 
 
 H 
 
 .45 
 
 .65 
 
 19 
 
 211 
 
 IJ 
 
 lA 
 
 1.65 
 
 1.85 
 
 Number. . 
 
 Diameter at large end, inches... 
 
 Per 100 
 
 Number 
 
 Diameter at large end, inches. . . 
 
 Per 100 
 
 Corks, XXX Quality, short taper. 
 
 Number 
 
 Diameter at small end, inches.. 
 
 Per 100 
 
 Number 
 
 Diameter at small end, inches j \^ 1 Ij^ 1^ 1^ IJ 
 
 Per 100 75 ."80 ^5 ^0 1^05 1.15 1.35 
 
 Corks, XXX Quality, flat, | inch high, so-called "specie" corks, very slight taper. 
 
 Diameter, inches v | 1 IJ- 
 
 Per 100 ~M "^^50 Is ItO 
 
 Corks, XXX Quality, same as No. 25110 but f inch high. 
 
 Diameter, inches 1^ Ig 1| IJ 
 
 Per 100... 1.35 1..55 1.80 2.05 
 
 Diameter, inches 2j 2^ 2^ 2§ 
 
 Per 100 3.20 3.65 4.10 4.70 
 
 Corks. XXX Quality, same as No, 25110 but f inch high. 
 
 Diameter, inches 3 3^ 3.' 3j 4 
 
 Each Tot ^09 Jl ^13 Aft 
 
 Diameter, inches 4f 5 5j 51 
 
 Each ~24 .27 .31 .35 
 
 Cork Borers, of hard brass. 
 
 Number in set 3 6 12 15 
 
 Per set (iO iM 
 
 Cork Borers of hard drawn brass tubing. 
 
 Number in set 
 
 Per set Oo 1^75 2^0 
 
 Cork Borer, for both wood and rubber corks, with device for conveniently holding the set of borers 
 
 which vary from 4 to 15 mm in diameter 9.00 
 
 Cork Borer Sharpener, I'ojivcnicnt for use in connection with No. 25130, for sharpening both inside 
 
 and outside of borers 1.00 
 
 2 
 
 2i 
 
 .30 
 
 2J 
 
 2.75 
 
 21 
 
 .30 
 
 5.90 
 
 4; 
 
 *i 
 
 .18 
 .40 
 
 .21 
 
 6 
 
 .45 
 
 Each borer supplied with handle. 
 
 1.75 2.40 3.20 
 
 A very convenient form. 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 2r,1.38. 
 25142. 
 
 25154. 
 25158. 
 25162. 
 25166. 
 
 25170. 
 25174. 
 25178. 
 
 Cork Borer Sharpener, a ^Icel cuiie with kiiifd: . . 1.00 
 
 " Extractor, folding. Extractor is pushed down between nf(.'k of botlle aiul coi-k and tlieu i-otiited 
 and cork withdrawn. Very practical. 15 
 
 Cork Press, Lever, of cast iron. Size Hmall L;<.rge 
 
 Each ,25 .40 
 
 Cork Press, Rotary. I'or corks up to, mm IS 32 
 
 Each 5» "" .75 
 
 Cork Screw, quick aeting, in heavy wooden handle 25 
 
 " " self pulling, with wire cutter. The most simple and practical cork screw made 50 
 
 Cork Tongs, for compressing corks by hand 75 
 
 Counting Apparatus, Stewart, for colonies of bacteria, consisting of a hard wood box 12 x 6 x 8 inches, 
 which contains a 16 candle-power incandescent lamp and adjustable platform carrying a Petri 
 dish which is illuminated by oblique rays from the lamp which do not enter directly into the 
 eye of the operator. A ruled glass plate is provided on the top of the box and the counting 
 accomplished by viewing the colonies in the Petri dish through the glass plate. Sec Journal oj 
 
 Medical Research, January, 1906 12.00 
 
 Reading Lens, for use with same 1.50 
 
 Ruled Counting Plate, only 6.00 
 
 Counting Apparatus, Woiffhuegel, for colonies of bacteria. Complete on wooden base with ruled glasa 
 
 plate and black and white back-grounds 5.00 
 
 Ruled Glass Plate, only 1.50 
 
 Counting Plate, Jeflfer, for colonies of bacteria. See Journal of Applied Microscopy and LahoraioTy 
 Methods. Vol. 1, No. 3. Can be used interchangeably with the Wolffhucgel's ])late on the same 
 b^^e 2.00 
 
ARTHUR 
 
 THOMAS 
 
 O M P A N Y 
 
 J* 1 
 
 . HiitlchtT. with moist cliambcr, consisting of ;in i 
 II iii:imolci' and 8 mm high cemented thereon. (. 
 2 nun each, 19 of whieli squares arc numbered,, , . 
 
 Uii glasa 
 iilcd into 
 ., . 1.50 
 
 twiwffVV 
 
 25202. Crucibles, Denver Fire Claj made in both hard and soft burn, 
 
 Capacity, grams 5 
 
 Approx. number in original barrel 900 
 
 Per dozen .40 
 
 Per 100 in original barrel 3.00 
 
 25206. rovers, per dozen 40 
 
 300 
 1.00 
 
 Crucibles, Denver Fire Clay without covers. 
 
 Number D E 
 
 Height, inches -i 4-i 
 
 Diameter, inches 2^ -i 
 
 .'\pi)rox. nuiiLber in original barrel 500 .'i50 
 
 Per dozen 50 .75 
 
 Per 100 in original barrel 3.50 5.50 
 
 Covers, per dozen 35 .50 
 
 3 J 
 300 
 
 3ii 
 200 
 1. 10 
 
 1.80 
 7.00 8.00 12.00 
 
 L 
 3 
 5i 
 50 
 3.60 
 27.00 
 
f*. 
 
 
 \ 
 
 No. 252IS Nil. 2.1L'L>2 Mo. 2S2;)0 Nu . No. 25212 No ....Hi 
 
 2;)218. <.'rucibles, Hessian Sand, tciLiiigular form. 
 
 Threes Small 5s CtntimeferH Larite .Is Kifhla Siies 
 
 Kunibtir in nosfc ^ ;^ 8 5 o 6 
 
 Height of largest, inches 3 4 4g 4J 7^ SJ 
 
 Width at top, inches. 2 -^- 3_ 3,1 3^ 5J 4i_ 
 
 Per nest .10 " .10 .10 " .10 .30" .20 
 
 25222. Crucibles, Battersea, round form. Dimensions given are outside dimensions. Without covers. 
 
 Number A B C D E F O H J 
 
 Height, inches 2| 3 3.^ 4 4^ 5 5| 5^ 6| 
 
 Diameter, inches If 1^ 2i 2} 2} 3 3| 3i 4f 
 
 Number in original barrel 1000_JOOO_ 750 600 _ ^00 500 400 300 250 
 
 Per dozen 30 .3.5 ' .40 .45" .70 .80 1.10 1.20 1.65 
 
 Per 100 in original barrel 1.85 2.25 3.25 3.60 5.75 6.25 S.60 9.00 13.00 
 
 25226. Covers, per dozen 30 .30 .30 .35 .45 .55 .70 .80 .85 
 
 25222. Crucible, Battersea, Continued. 
 
 Number K J. M N O 1' Q R 
 
 Height, inches 7^ S Si 9^- 10 11 IL' 13 
 
 Diameter, inches 4j 5\ 5j ()k 7 7j &} 03 
 
 Number in original barrel _ 150 100 100 75 r,() 40 30 25 
 
 Per dozen 1.75 3.00 3.50 4.90 7.25 8.00 9.15 12.00 
 
 Per 100 in original barrel 13.50 24.00 28.00 39.00 58.00 64.00 73.00 100.00 
 
 25226. Covers, per dozen. 1.10 1.20 1.35 1.60 1.90 2.10 2.25 2.70 
 
 25230. Crucibles, Battersea, triangular form; without covers. 
 
 Number S T IJ V \V 
 
 Height, inches 4^ 4 3^ 3; 2| 
 
 Diameter, inches ig 31 3', 2} 2\ 
 
 Per dozen 1715 .85 .60 .45 .40 
 
 Per 100 in original barrel 8.75 6..50 4.75 3.60 3.00 
 
 25234. Covers, per dozen 85 .85 .70 .50 .50 
 
 25238. Crucibles, Alundum, highly refractory; well adapted to experimental electric furnace work and 
 used successfully for melting platinum. They are not, however, adapted for uses where slaga 
 are encountered on account of their absorbent nature. 
 
 Number 5144 6608 6S20 .5022 5923 
 
 Diameter, inches , 3 21 21 IJ If 
 
 Height, inches _3s 4J 2^ 2 3i 
 
 Each 1^25 £00 1.00 .75 1.50 
 
 25242. Crucibles, Opaque Fused Silica, for melting. 
 
 Number 1 3 4 6 7 14 IG 30 60 70 
 
 Height, inches..... 3A 4^- i r>\ 7\ 7| 83 10', 121 20 
 
 Diameter at top, indies 2J 3J 4j 4i 4}^ 5^ lij 7^ lOJ 12 
 
 Each 2^0^ 2V15 2.15' 3.15 '3775 4.00 5.00 "S.OO 12750" 18.00 
 
 25246. Crucibles, Dixon's Plumbago. Capacities given are actual total, not working capacities. The working 
 capacity is variable, and may be from 70% to 90% of those given. The total capacity in pounds 
 of metal depends on the specific gravity, and may be found approximately by multiplying the 
 total liquid capacity in pints by the specific gravity of the metal. 
 
 Number 00 000 0000 1 2 3 
 
 Capacity, pints I •'. ] 1 
 
 Height, inches 2 2^ 2i- 3 3j 4i- 5i 
 
 Diameter at top, inches H If 2 2^ 3t 3J 4{ 
 
 Each 20 .20 .20 725 " .30 .35 .40 
 
 Number 4 5 6 7 S 9 10 
 
 Capacity, pints H H 2^ 2' 3 3.} 4 
 
 Height, inches 5^ 6 6^ R-; 7'r 7h 7{^ 
 
 DiarYieter !it top, inches _ 4f 4| 5.^ 5?, ^ 5:; G 6| 
 
 Each ".4.5 !55 ^60~ 765 ~ .70 775 " .80 
 
 252.)0. Covers, Dixon's Plumbago, only, for crucibles No. 25246. 
 
 To fit No _0 00 IKHI OOriO I 2 3 
 
 Each .15 .15 7l5 .15 .15" .15 J5 
 
 To fit No _^ _^ G 7 8^ _ _ 10 
 
 Each 15 .15 ".20 .25 ^20 .20 .20 
 
25258. 
 25262. 
 
 25266. 
 25270. 
 
 25274. 
 25278. 
 
 25282. 
 26286. 
 
 25290. 
 25294. 
 
 30 
 
 .12 
 
 Crucibles, Sanitiits Porcelain, trade mark blue airuw 
 
 Number 8 7 (i 
 
 Capacity, cc 10 IS 
 
 Diameter, mm -30 3-5 
 
 Each .07 "" ^.07 "" 
 
 Covers, only, for crucibles No. 25254. 
 
 To fit Number _S 7 
 
 Each .05 .05""" 
 
 Crucibles, Sanitats Porcelain, trade mark bl 
 
 Number 000 00 
 
 Capacity, cc S 13 
 
 Diameter, mm 25 34 
 
 Each. 
 
 1 form, glazed throughout, without covers. 
 .-, 4 3 2 1 
 
 40 65 90 135 17^ 
 
 48 55 _ 63 70 80 
 
 .12 .16 .20 .25 .35 
 
 6 5 4 3 2 1 
 
 .08" .08 .12 .15 .17 .25 
 
 arrow, low form, glazed throughout. Without covers. 
 
 
 15 
 40 
 
 3 
 00 
 
 .07 .07 
 
 Covers, only, for crucibles No. 25262. 
 
 " - ■• ■ — 00 
 
 To fit Number 000 
 
 Each 05 
 
 Crucibles, Royal Berlin Porcelain, 
 
 Number 000 
 
 Diameter, mm 26 
 
 Capacity, cc 5 
 
 Each ^9 
 
 Covers, only, for crucibles No. 25270. 
 
 To fit Number 000 
 
 Each 
 
 .07 
 
 
 4 
 150 
 80 
 .14 
 
 5 
 250 
 
 87 
 
 .05 .03 .07 .07 .08 
 
 trade mark blue scepter, high form, glazed throughout. 
 
 
 35 
 
 52 
 57 
 
 3 
 62 
 
 .10 .14 
 
 without covers. 
 4 5 
 
 72 87 
 
 05 .05 .06 .06 .09 .12 .12 .15 
 
 Crucibles, Royal Berlin Porcelain, trade mark blue scepter, low form, glazed throughout Without covers. 
 
 Number 00000 0000 000 00 1 2 3 
 
 Diameter, mm 14 18 32 37 41 46 56 67 81 96 
 
 Capacity, cc i 2_ 8 12 17 30 50 90 145 265 
 
 Each 06 .07 .12" .15 .18 .23 .35 .40 .50 .60 
 
 Covers, only, for crucibles No. 25278. 
 
 To fit Number 0000 OOP 00 1 2 3 ^ 5 
 
 Each 05 .06 .06 .06 .09 .09 .12 .15 .18 
 
 Crucibles, Royal Meissen Porcelain, trade mark crossed swords. Glazed throughout. Without covers. 
 
 Number 123456789 10 11 
 
 Diameter, mm 80 70 65 55 45 40 35 30 23 18 14 
 
 Capacity, cc 200 140 100 60 40 28 15 7 3 1 U 
 
 Each ^40" .35 .35 .25 .21 .18 .15 .15 .15 .15 .15 
 
 Covers, only, for crucibles No. 25286. 
 
 To at Number 1 2_ 3 4 5 C 7 8_ 9 ^W_ 11 
 
 Each 21 .18 "^12 " .12 .09 .09 .06 .06 .06 .06 .06 
 
 Crucibles, Gooch, Royal Berlin Porcelain, trade mark blue scepter dazed inside and outside with the 
 exception of the outside bottom surface. Holes in bottom are ^ mm in diameter. Without 
 covers. 
 
 Number 2 3 4 
 
 Capacity, cc 10 2.5 36 
 
 Diameter at top, mm 27 35 40 
 
 " bottom, iiirii 18 22 25 
 
 Height, mm 30 40 43 
 
 Each 30 .40 .45 
 
 Crucible, Gooch, Royal Berlin Porcelain, trade mark blue scepter. Kxactlv similar to No. 1 of 
 25204 but with larger liolew, i. e., 1 nun ill diameter ." 45 
 
ARTHUR H. TH0^4AS COMPANY 
 
 -25300- 
 25302. 
 
 25303. 
 25304. 
 
 2530r.. 
 20356. 
 25310. 
 25312. 
 
 25316. 
 
 25318. 
 25320. 
 
 25322. 
 25324. 
 
 Crucible, Gooch, Sanitiits Porcelain, with perforated bottum, glazed throughout; 38 mm diameter of 
 top by 40 mm high, diameter of bottom 25 mm. Without cover 40 
 
 Crucible, Caldwell, Royal Meissen Porcelain, with removable perforated bottom.' ' Glazed throiiEhoiit. 
 Removable bottom glazed on upper surface only. 
 Height 40 mm, diameter at top 40 mm, diameter at bottom 25 mm .50 
 
 Loose perforated bottom only, for above crucible ^20 
 
 Crucible, Rose, Porcelain, with perforated cover and delivery tube. Unglazed, 
 
 Capacity, cc 15 30_ 60 
 
 Each 50 .80 .90 
 
 Crucible, Plattner, Royal Meissen Porcelain, glazed throughout, with wide flaring lip; height 25 mm, 
 diameter 45 mm 25 
 
 Crucible, Royal Berlin Porcelain, of special shape, with large filtering surface,' as used in the deter- 
 mination of soluble bitumen; height 24 mm, width at top 45 mm, width at bottom 35 mm. . .50 
 
 Crucible, Caldwell, Opaque Fused Silica, with open bottom with flange to take porcelain or plati- 
 num disc; 45 mm diameter at top, 25 mm diameter at bottom and 45 mm high, without disc. 1.80 
 
 Crucibles, Iron, spun from sheet, with covers. 
 
 Capacity, cc 20 50 100 
 
 Diameter, inches H 25 2i 
 
 Height, inches 1} 1^ 2 
 
 Each ^"o~ ^5 " ^30 
 
 Crucibles, Copper, epun from sheet, with covers. 
 
 200 
 3i 
 
 .40 
 
 Capacity; 
 
 Diameter, inches 1^ 
 
 Height, inches If 
 
 Each 750 
 
 Crucibles, Pure Silver, with covers. 
 
 Capacity, cc 20 
 
 Approximate weight, grams 35 
 
 Each "3T5 
 
 Crucible, Nickel, Pennock -Martin, 40 cc capacity 
 
 30 
 
 .60 
 
 50 
 
 .70 .80 .90 1.10 
 
 30 50 75 100 150 
 
 45 60 80 100 150 
 
 3.75 5.25 7.00 8.50 "1^00 
 
 For the rapid determination of sulphur in coal 
 and coke. See Journal of Ike American Chemical Society, December, 1903. 
 
 Complete on stand 3.OO 
 
 Crucibles, Pure Nickel. Theae are very superior to the ordinary article in which the manganese con- 
 tent frequently causes trouble. The shape is also special, being that approved in steel labora- 
 tory practice. With covers. 
 
 Diameter, mm 35 40 45 50 55 60 80 100 
 
 Actual capacity, cc 23 36 50 74 93 130 300 540 
 
 Each 60 .70 .80 I.OO 1.15 1.25 2.00 3.00 
 
 Crucible, Kawin, Pure Nickel, heavy wall, as used in muffle furnaces for burning off filter paper in 
 
 silicon determinations in iron; 28 mm in diameter by 15 mm high 50 
 
 Crucible, Gooch. Pure Nickle. with perforated bottom and extra removable cup; 30 cc capacity, U 
 inches in diameter by 1« inches high 1.25 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 25334 No. 2yub No. 25350 No -53J0 No. 25342 
 
 25326. Crucibles, Alundum, for general laboratory use. These crucibles are of a very light colored mix- 
 ture of which the factory number is RA 84, which number is stamped on each crucible. With- 
 out covers. 
 
 Diameter, inches 1 2 U U 
 
 Height, inches Ifs ^a 1* 
 
 Capacity, cc 20_ _40_ 25 
 
 Each .30 ~" .35 .35 
 
 25328. Covers, onlv, for crucibles No. 25326. 
 
 To fit Number 5202 5203 
 
 Each _ .30 \ .35 
 
 25330. Crucibles, Filtering, Alundum. These crucibles are madfc in three degrees of porosity of which the 
 factory designations are RA 98 very porous, RA 360 medium porous and RA 84_ slightly porous. 
 The varying degrees of porosity are easily discernible by their color and the mixture number is 
 stamped on each crucible. Please state porosity in ordering. Without covers. 
 
 Diameter, inches If If 
 
 Height, inches U IH 
 
 Capacity, cc 25 35 
 
 _ Each .._. ^ _ .30 .35 
 
 25332. Crucible, Alundum, specially made for determining moisture in samples of coal. 2 inches in diameter, 
 ] I iiN-licM high 40 
 
 25334. Crucibles, Opaque, Fused Silica, highly glazed; low, wide shape, without covers. 
 
 Height, inches i 1 l\ lie U 
 
 Diameter, inches If If If ~i -s 
 
 Each ^0 ^.60 .75 .90 1.25 
 
 25336. Crucibles, Opaque, Fused Silica, highly glazed, high form, without covers. 
 
 Height, inches " 2 If H 
 
 Diameter, inches 2 If 1^^ 
 
 Each 1.25 1.25^ T25 
 
 25335. Covers, only, for crucibles No. 25334 and 25336. 
 
 Inside diameter, inches If 1, 2 25 21 2f 
 
 Each ~50 T50~ .60 .60 .75 .90 
 
 25340. Crucible, Opaque Fused Silica, highly glazed, special large size, 73 mm diameter and 8 mm high. 2.50 
 
 2.5342. Crucible, Iron, Skidmore. Designed for making oxygen from MnO;, calcination of chalk with recov- 
 ery of the expelled CO2, manufacture of soda from cryolite, preparation of ammonia, destructive 
 distillation of coal, wood or other organic substances, or for any use in which the materials 
 employed or evolved do not act destructively on hot iron. 
 
 Capacity, ounces i 6 
 
 Each 1.25 2.00 
 
 2.5346. Crucible Holder, Bailey, consisting of a rubber holder taking a 25 cc |)orrelain Gooch crucible. The 
 rubber holder fits an ordinarj^ 2 inch 60° glass funnel as shown in illustration. The lower part 
 of the rubber holder rests against the side of the funnel supporting the crucible while the upper 
 fiart nialvcs a seal against the top of the funnel when suction is applied. Rubber holder only .30 
 
 25348. Crucible Holder. Spencer, consisting of a special glass funnel or filter tube, with projecting lug to 
 suppoit crucible, and rubber ring for use with Alundum crucible. The suction makes tight 
 contact between the crucible and the inside of the glass funnel. Wee Journal of Industrial and 
 Eu<iinen-in<i Chrmislry, Vol. 4. _Vo. 8, Sept., 1912 1.50 
 
 25350. Crucible Holder, Walter, for Cooch crucibles of 25 cc capacity, consisting of a combined rubber stopper 
 and cnicililo holder with glass funnel shaped tube set m stopper. Will fit the neck of any regu- 
 lar suction fiask up to 1 liter capacity. Price includes the funnel tube and rubber part only .40 
 
ARTHUR 
 
 HOMAS COMPANY 
 
 3.52. Crucible Holder, Kolary. Inr 1 lie niiiforni lirut- 
 
 in lij- .IrlriiLiiiialiO]. of 
 
 ;t,sli, cv.'ip.iralions wiili <-(jrir.Tih-;]l .:<1 
 siilplmrii'. !H-i'l, iiiciiicr;iliiiii •<( MUgu.r, 
 ^l\-iTrii]c. f(H]i| |jf(i(liii-i - elf A uniform 
 
 hcVlilljinl IImtiiIiiv rulil-Mii^of l.he CfU- 
 rihlr i^smicnl li\ ll,.' i nl :,l inn of the 
 
 triangle Kii[i|Mirlinii il . \ji|];iratua is 
 arranged wit h |nillr\ fm- iTinvnient con- 
 nection to \\".iici- ninhii- Ml- ul.licr source 
 of ])o\vcr. I 'onipli'ii- with nni- hiirnfir as 
 ■■'iiRlrafiMii .... 20.00 
 
 CRUSHING, GRINDING AND PULVERIZING APPARATUS 
 
 For Ores, Minerals, Drugs, Food Stuffs and Samples of various kinds. Bacteria, Animal Tissues, Lymph, etc. For 
 
 convenience we have grouped under the above heading apparatus heretofore liatcd under Crushers, Grinders, 
 
 Mills, etc., believing that such an arrangpitn'iif viM f:if!lit;it" 'r'lcction, 
 
 25354. Crusher, or Bucking Board, of riiill 1 ii i ].■ I i is x 24 inches 10.00 
 
 25358. " " " " siniil;i( - ■ J' ... ; i ..i liardest Chrome Steel, weighs 115 lbs. Rubber 
 
 IS 7 X 8 inches and weighs :-;ii It.- I l . r ' ' ...s not grind off into the sample. As used in 
 
 many large steel laboratories ami /i- I..(l by the Chrnii.sls' Committee of the I'. S. 
 
 Steel Corporation in their ''Unifm ;,... / .. . . 45.00 
 
 25362. Crusher, Weatherhead Patent, a pulveii/n ,- ■! I .iiii.,l'^:inialnifi niurtar which crushes and pulverizes 
 coarse material at one operation. W i.l li,L.,.iii :iiiy material from ulay to pig iron. 'Ihe cover 
 of the machine is so designed that. iL may be used as a small hand mortar usimi the end of the 
 handle as a pestle , , . , 25.00 
 
 25366. Mill, Assay, for pulverizing hard substances, such as ores, etc., for analysis. To bolt to bench or table 
 AVill take material abi^mt J inch in diameter 10.00 
 
 25368. Extra plates for al>ove, ]>cr set '.'.', 2.00 
 
 25370. Grinding Apparatus with Agate Mortar, for reducing ore to an impalpable powder. It is ahso used for 
 grinding bacteria and other organic materials. Any desired pressure may be obtained and both 
 mortar and pestle revolve giving a combined rolling and sliding motion. Agate mortar is UQ 
 mm in diameter. Total height of apparatus 18 inches 60.00 
 
Nn. 2537S No. 253&6 
 
 25374. Crusher, Case Patent. When driven by power has a capacity of from 100 to 200 lbs. per hour. Jaw 
 opening is 2^ x 3 inches. The adjustment for fine or coarse work is made by use of patented 
 shims which are inserted between the front jaw plate and the frame, affording a variation of from 
 I inch to 20 mesh. Weight 135 Iba. For hand power only 37.00 
 
 25378. Crusher, Case Patent, exactly game as No. 25374 but arranged for both hand and power driving 40.00 
 
 25382. " " " large size, for power driving only. Similar to No. 25378 but with jaw opening 
 3 X 4^ inches, capacity 200 to 300 lbs. per hour, shipping weight 350 lbs. Furnished with both 
 tight and loose pulleys 100.00 
 
 25386. Pulverizer or Sample Grinder, Iler's Patent Disc. Will grind an ordinary 8 oz. sacnple to 100 meah 
 in less than one minute. Adjustment for degree of fineness can be made while machine is in 
 operation, thus one part of a sample may be ground to 50 mesh, part to 100 mesh and part to 
 200 mesh while the machine is in motion. Made in two sizes, the small size with 6 inch discs, 
 weighing 130 lbs. and is furnished with 10 inch pulleys and requires ^- h. p. to operate; the large 
 size has 9 inch discs, weighs 300 lbs., and is furnished with 14 inch pulleys and requires 2 h. p. 
 for operation. With one set of discs. 
 
 Diameter of discs, inches 6 _9 
 
 Each 85.00 145^00 
 
 25388. Grinding discs, per set 5.00 11.00 
 
 No. 253311 No. 25390 No. 25402 
 
 25390. Sample Grinder, Braun, for Ordinary Ore, pulverizes to 200 mesh at one grinding. Capacity 4 oz. of or- 
 dinary granite rock to 100 mesh in 3 minutes. For hand power only, with one set of discs. 50.00 
 
 25392. Sample Grinder, Braun, for Coal and Coke, otherwise exactly the same as above 50.00 
 
 25394. Sample Grinder, Braun, for Coal and Coke, with tight and loose puUev for power driving 60.00 
 
 2.5396. Grinding Discs, for any of above, per set 10.00 
 
 25398. Sample Grinder, Braun, for Iron Ore, with discs of special carbon steel containing a low percentage 
 
 of phosphorous. With both tight and loose pulley for power driving 85.00 
 
 2.5400. Grinding Discs, of special carbon steel, per set 20.00 
 
 25402. Grinder for Iron Ore, Braun, New No. 7, similar in construction to the Sample Grinders but larger 
 and built for higher speed. Grinding plates are 7 inches in diameter and are of carbon steel 
 with low phosphorous content. Will grind | inch material to 200 roesh. With balance wheel 
 and tight and loose pulley for power only 125.00 
 
 24504. Grinding Discs of special carbon steel, 7 inches diam., per set 22.50 
 
 24505. Grinding Discs for coal and coke for above, per set 10.00 
 
 162 
 
Pulverizer, Eraun Planetary, wurks equally well on hard, soft and taley ores, such as lime rock, cement 
 rock, etc. The planetary movement is obtained by a set of external and internal clover leaf 
 gears. About 15 teeth are simultaneously in mesh, producing a slow, noiseless movement to the 
 quill, which, being bored eccentrically, causes the rotating plate to impart a planetary movement. 
 AH the working strain is removed from the main bearings, thus insuring long life to the most 
 expensive parts, and renewals at slight cost of those parts which take the most wear. Thia 
 machine has a greater capacity than the regular Braun Pulverizer. Material which has been 
 previously crushed to J mesh can be ground to 80 mesh at the rate of 1 pound in 40 seconds, or 
 90 pounds per hour. The machine can be instantly adjusted to pulverize to any fineness while 
 it is in operation, or at rest. The machine is as easily cleaned as the regular Braun Pulverizer 
 No. 254:^, and above illustration shows the simple manner of opening the cover and side door 
 for this purpose. An important feature is that all the material is brushed into the pan beneath 
 the machine so that the entire sample is saved. Length 36 inches, height 16 inches, speed 
 
 .550 r. p. m., power 2 H. P. With one set of grinding plates 150.00 
 
 Grinding Plates for above, extra, per set l.'i.OO 
 
 w ^^!»*!^ 
 
 25418. 
 
 25422. 
 2542^. 
 
 Crusher, Simplex Ore, for liand power only. The important features of this machine are the ease with 
 which the front jaw may be removed for cleaning the interior parts, and the simplicity of ita 
 adjustment. There are no bolts or screws to be removed and the machine can be opened and 
 closed again in a moments time; very substantially built; size of jaws 6x3 inches 30.00 
 
 Crusher, Simplex Ore, as above for hand and power driving 33.00 
 
 power driving only, with both tigli( ; 
 Pulverizer, Braun Improved UA Type. The most important feature oftlii- 
 ity of ail the interior parts for thorough cleaning. These parts are ci 
 isiied allowing the material to be easily brushed into the pnn. '! In- :ii 
 door of the machine are opened insures all of the pulp bein;: '.i i, I - ■ 
 of the machine varies according to the fineness to which the i ■ ■ i 
 If I and smaller mesh material is fed into the Pulverizer it ■■. I ■ - 
 100 mesh. If the material has been crushed to about 10 nu -ii i ■, 
 per hour to 100 mesh. The machine is fed through the spimi r ■ n 
 J mesh and smaller and reduce it all with one grinding tn :i.. . 
 age speed at which the Braun Pulverizer should be operatol i.s n.">iI i 
 set of grinding plates, length 23 inches, height 141 inches, power 1 H. P. 
 Grinding plates for above, extra, per set 
 
 leys 40.00 
 
 : I ' i< the accessibil- 
 ' . II' III or machine fin- 
 iLi \v ,]iili the cover and 
 I 111' pan. '1 ho capacity 
 '■(■11 |>nviunsl\- crushed. 
 liile till \\t~i. per hour to 
 ^i!y handle SO to 90 lbs. 
 and will take material 
 mesh. The best aver- 
 Complete, with one 
 
 100.00 
 
 8.00 
 
25458. 
 25462. 
 
 
 
 R 
 
 itric bolt 
 
 
 d 
 
 
 h backward 
 
 
 w d 
 
 d 
 
 erator, it 
 
 
 u 
 
 hp 
 
 h tationary 
 
 
 ma n f 
 
 
 h ne 13 the 
 
 
 
 and b 
 
 h d y secured 
 
 
 h 
 
 
 h h all of the 
 
 
 ■\\ 
 
 n b 
 
 n d from the 
 
 
 b w n 
 
 b kw 
 
 d h exposing 
 
 
 s n 
 
 up n 
 
 n trie shaft 
 
 
 Th 
 
 " 
 
 p a circular 
 d scribe an 
 
 
 
 hb ra ion, and 
 
 
 
 
 
 400 b per hour 
 ... 45.00 
 ... 55.00 
 
 
 g n 
 
 P 
 
 y 000 to 1500 
 
 
 d Dg 
 
 
 .. 110.00 
 
 2;|>438. Tru h No a 
 
 25442. Cm h No K 
 
 p n h n b h hand 
 
 25446. Crusher, No. 3a, laige size as above but for power drnmg onlj, with tight and loose pullejs. . 125.00 
 
 2;'i450. Milling Machine, Laboratory, Johnson, for taking samples of thin sheets, wire, resistance ribbon nails, 
 
 stnel 1)1 kIls and small samples of all kinds that are irregular in shape for use in carbon determi- 
 
 n ilioii-i in iron anil filcel analysisi 28.00 
 
 hriS I... n 
 
 Mill, Seckl :.■■■ 
 Mill, Grinding 
 
 by 1.' in. 
 Ramj 
 
 i;n;irsc .i^ii.-;t a wKloly usod laboratory null, parLiouhirly adaptable for grinding malt 
 ''' '■'■■^i''' '>' '■■•" '"■--. ^vliich IS adjustable by a special regulating device. '1 his mill 
 ■ ' '" I '■■" ■ " I ii.iial Congress of Chemists in Berlin and the Hoyal German 
 
 ;'■''■"' ' ■" ''■'"'.' >'viug 100.00 
 
 '""■'', '-'■"■' I ""■■■, I ■! dri\'mjj, 105 00 
 
 nd I'lilverizing. \\ ill granulate or grind to fine powder. Pulley 10 inches in' diameter 
 lofi wide. Is used with great satisfaction m tanning laboratories for grinding leather 
 in GOBrl oil and other laboratories . 25.00 
 
 1 in cotton e 
 
 Mill, Porcelain, for grinding either wet or dry substances, for both bacteriologicarand chemicafpur- 
 poaes, with grinding parts of acid-proof porcelain. With grinding surface of 170 mm in diam- 
 eter, lor hand power 25 00 
 
ARTHUR H. THOMAS COMPANY 
 
 Mill, Excelsior, fur dru^s, food stuUt, s( l l-, m 1 j „il it \ iii t\ f otiiLr work iii srindiiiji; laboratory 
 samples. Widely used iq -igntultural Fxpcriment 'stations Diameter of grinding discs 61 
 inches. Output per hour 2d to 50 lbs 
 DutyFree 77^> Duty Paid 94.50 
 
 Mill, Swift B. Easily adjusted to it I i I imlmf. Can be opened, cleaned aad 
 closed quickly and without ihiii nil i s as adjusted. Hopper capacity 3 
 lbs., total height 30 inche', h imc 1 i I I 25.00 
 
 Mill, Drug, for grinding drugs t,r un I i 1 i „ulited to grind to various degrees of 
 
 fineness. 
 
 Height, inches 12^ lo 20^ 
 
 Diameter nf wheels, inches ^ _ ^ 10 
 
 Each 4 25 li.OO 9.00 
 
 Mill, Laboratory Drug, Korner, a new moilcl p!ii'tu-iil:iilj- adajituil lor lin' gi-iniiiiii! t)f vegetable sub- 
 stances and the preparation of drugs, feed stuffs, etc.; ;is supplied by us to the leading pharma- 
 ceutical manufacturers in the U. S., and as used in the U. S. Department of Agriculture, etc. 
 See Chemiker-ZeHung , 1903 27, No. 4^. For hand driving, with improved ball bearings. 
 Duty Free 115.50 Duty Paid 140.00 
 
 Mill as above, but for power driving, with improved ball bearings. 
 
 Duty Free 82.50 Duty Paid 100.00 
 
CS2D 
 
 No. 23490 No. 25494 
 
 25490. Ball Mill, cuiiaiBtiiijr uT n pui-celiiiii jur with pebbles, ^\"ill handle specimens from j oz. to U lbs. at 
 one time. Pulley is 9 inches in diameter x 1 inch wide and requires 80 to 100 r. p. m. for fine 
 grinding. Outside dimensions of jar 5,2 x 5,7 inches. Price complete with pebbles 15.00 
 
 25194. Ball Mill, consisting of a porcelain jar and pebbles. Jar is 8.7 x 9.6 inches. Will handle quantities 
 from a few ounces up to 5 lbs. Wheel pulley 9 inches in diameter, with handle. Requires 60 
 
 r. p. m. Complete with pebbles 30.00 
 
 Extra Jars, for No. 25494, each 12.00 
 
 Porcelain Pebbles, per lb 30 
 
 Grinding Apparatus for Bacteria, etc., White, and as used in the laboratories of the Pennsylvania 
 
 State Live Stock Sanitary Board. Glass globes may be sterilized with the agate marbles inside. 
 
 Complete with two glass globes and set of agate marbles 35.00 
 
 25510. Extra Glass Globes, each 5.00 
 
 25514. " Marbles, per box of 25 5.00 
 
 25518. Ball Mill, Porcelain, small model on baseboard, with water turbine and including 2 kilos of hard 
 
 pnrcelnin balls. 
 
 Duty Free 26.40 Duty Paid 32.00 
 
 ^.1 
 
 No. 25522 jStf desc-riplion on foUowing paee.) 
 
N 
 
 -5522. Grinding Machine for Bacteria etc.. consisting of from Uirec to five horizontally operated porcelain milla. 
 As furnished by us to the laboratories of Henry Phipps Institute, Philadelphia, Pennsylvania 
 fatate Live btock Board, etc. Complete with motor for 110 or 220 volts direct current. 
 
 Number of Mills 2 3 4 5 
 
 ^"^y ^ree 136 j5 ' I63.35 199.65 252.30 
 
 -.sc^^ ^".*' «"* . . V..;, ■ ,. 1"»5.00 198.00 242.00 305.80 
 
 255Jb. Extra Porcelain Mills for above, capacity 1200 co. Can he sterilized. 
 
 Duty Free, each 8.7r) Duly Paid, each 11.50 
 
 No. 2o53l] No. 25538 
 
 Grinding Apparatus, Macfaedyen, for Bacteria and Frozen Organisms. The construction of this 
 apparatus is based upon the fact that the organisms pulverize better when frozen by liquid air 
 to the hardness of glass. The mortar is operated in a liquid air vessel. Complete with motor. 
 Current and voltage must be specified in ordering. 
 Duty Free 591.70 Duty Paid 717.20 
 
 Grinding Apparatus for Organs, Tumors, etc., by means of pressure applied during the cutting. Model 
 of the Hygienic Institute, Berlin. The substances can be finely enough ground as to be injected 
 directly. 
 
 Capacity, grams 10 50 
 
 Duty Free 24.75 49^ 
 
 Duty Paid 30.00 60.00 
 
 Grinding Machine for Bacteria, etc., Koch, as supplied by us to the laboratories of the Henry Phipps 
 Institute, Philadelphia. With motor. Current and voltage must be specified in ordering. 
 Duty Free 435.60 Duty Paid 528.00 
 
ARTHUR H. THOMAS COMPANY 
 
 25542. Grinding Machine for the Preparation of Animal Lymph. Dtiviaed for the thorough mixing of the ani- 
 mal lymph with the necessary glycerine. Ihe lymph is poured into the conical_ shaped funnel 
 and is carried by means of the revolving spindle through the cylinder. The spindle is of pure 
 nickel screwed with a thread, gradually tapering from a rough thread at top to a very fine thread 
 at bottom. The inside of the cylinder is also of pure nickel. The mixing sjiindle is run on a 
 compound ballbearing and is so arranged that it can easily be removed for pterilizing and replaced 
 without any difficulty. In order that the bore of the cylinder may be easily cleaned and examined 
 the cylinder is cut into two halves and held together when in use by the clamps shown. The 
 machine is mounted on a strong table with marble top and the working part is encased under 
 a glass cover with hinged door. The cover need not be removed when the machine is at work. 
 By means of this machine the lymph is thoroughly mixed in about 15 minutes without any loss 
 of the lymph which is kept perfectly free from dust. As supplied by us to some of the leading 
 manufacturers of biological products in the U. S. Complete as illustrated, for foot power, with 
 treadle and driving wheel. 
 Duty Free 142.00 Duty Paid 172.00 
 
 25.546. Grinding Machine, exactly same as No. 25542 but fitted with pulley for power driving. 
 
 Duty Free 122.10 Duty Paid 148.00 
 
 25550. Grinding Machine, exactly same as No. 25542 but with electric motor for direct current and adjust- 
 able resistance coila for starting. Voltage must be stated in ordering. 
 Duty Free 204.Rfl Duty Paid 248.00 
 
 25554. Grinding Machine, exactly same as No. 25542 but with electric motor for alternating current and 
 \\itli <ountershaft. Voltage must be stated in ordering. 
 Duty Free 224.50 Duty Paid 272.00 
 
 25558. Grinding Mili for Lymph. Model of the K. K. Impfstoff-Gewinnungs-Anstalt, Vienna; consisting entirely 
 of glass, permitting the whole utensil to be repeatedly sterilized. The complete outfit is mounted 
 on an enamelled iron bracket with marble top, and water motor for driving built in. 
 Duty Free 115.20 Duty Paid 158.40 
 
 25562. Grinding Mill for Lymph as above, but with electric motor drive. In ordering please state current. 
 
 Duty Free 204.00 Duty Paid 280.50 
 
 25566. Filling Apparatus for Lymph. Model of the K. K. Impfstoff-Gewinnungs-Anstalt, Vienna; improved con- 
 struction, with complete equipment for the adjustment of pressure and blast lamp for melting 
 the capillary tubing, on enamelled iron table, with electric motor. 
 Duty Free 228.00 Duty Paid 313.50 
 
 25570. Combined Lymph Grinding and Filling Apparatus, consisting of outfit No. 25562 for grinding, and 
 ontfit No. 25566 for filling. Complete, on enamelled iron table. 
 Duty Free 468.00 Duty Paid 643.50 
 
Grinding Apparatus, Borrel, for Organic Tissues, Bacteria, Lymph, etc. The grindiug is uccoiD- 
 plished by means of flexible steel leaves. The normal speed is about 2000 r. p. m. and the front 
 (shown removed in illustration) is of glass so that the entire process may be observed. All the 
 workinE parts may be readily sterilized and the machine is well suited for the grinding of moist 
 as well as dry material. 
 Duty Free 87.50 Duty Paid 105.00 
 
 Cryoscope, Friedenthal, for Molecular Weight Determination by depression of the freezing point in 
 physiological and clinical work. See Zcntralblalt fur Physdologie 1899-1900. Outfit consists 
 of the f llowing: — 
 
 Cooling Jar, with wooden cover nickel stirrer, one freezing tube with rubber stopper and one 
 freezing rod. 
 
 Thermometer, fur the cooling mixture, from —20 to +49° C. in single degrees. 
 Stirrer, for the solution, consisting of glass rod with platinum ring. Approximately 1.2 grama 
 of platinum. 
 
 Thermometer, Heidenhain, from +0.5° to -2 5° C. in,',„ths. As in medical work only a few de- 
 grees under zero are required in the thermometer, this thermometer is furnished with fixed 
 graduations so that the laborious adjustment of zero in the regular Beckmann thermometers ia 
 avoided. When small drops of mercury are found in the enlargement at the top of the tube 
 they must be carefully run into the tube by inversion of the thermometer. 
 Complete outfit as described. 
 Duty Free 10.75 Stock 16.25 
 
 Thermometer, Heidenhain, a.s described above 9.00 
 
 Cryoscope, Drucker-Burrian, for Molecular Weight Determination by depression of the freezing point 
 in physiological and clinical work, designed for small quantities, only 1.5 cc of solution being 
 necessary. See Z ntraiblolt Jiir Physiol oiji", Band XXI{I,Nt. 22. Outfit consists of the following: 
 Cooling Jar, with nickle plated cover and stirrer. 
 
 Freezing Tube, with cork ring and air jacket with cork for both thermometer and stirrer. 
 Stirrer, of glass with platinum ring, approximately 1 2 grams of platinum. 
 Thermometer, with fixed degrees as in Heidenhain No. 25582, from +0 5° to —5° C. in ^'^ths, 
 total length 24 cm, with specially small bulb designed especially for this apparatus. 
 Complete outfit as described. 
 Duty Fr.e 10.05 Stock 15.25 
 
 Thermometer only, as described above 9.00 
 
ARTHUR H. THOMAS COMPA N Y 
 
 25606. 
 25610. 
 
 25622. 
 25626. 
 
 Culture Dishes, Petri, of glass, fitted in pairs. The 100 x 10 mm size is the standard Petri dish for 
 bacteriological work throughout the U. S. The glass is very free from striae and will stand re- 
 peated sterilization with a minimum of breakage and corrosion. 
 
 Diameter, mm 100 120 150 
 
 Depth, mm 10 _ 10 10 
 
 Per pair : 20 .40 .60 
 
 Covers, Porous Earthenware, for culture dishes 100 mm in diameter. Each .15 
 
 Culture Dishes, of glass, fitted in pairs, with top and, bottom surface as free from striae as possible, 
 for cultures, mounting of specimens in gelatine, etc. 
 
 Diameter mm 40 50 60 80 100 120 150 200 220 240 
 
 .Depth, mm 10 10 IQ 10 15 20 20 35 40 50 
 
 Per pair 15 .15 .18 .21 .30 .40 .60 .80 .90 1.30 
 
 Culture Dish, of glass, with top and bottom polished, permitting the examination of cultures with 
 higher power objectives than the ordinary blown Petri dish. So-called Pasteur dish. Fitted 
 in pairs. 
 
 Diameter, mm : 100 100 
 
 Depth, mm 5 10 
 
 Per pair 50 .50 
 
 Culture Dish, of glass, fitted in pairs, with top and bottom of polished plate glass. Class rings forming 
 sides are cemented on at 600" C. in a special furnace. Especially valuable for photomierographic 
 work and use with microscope because of the freedom from distortion as compared with blown 
 dishes. Will stand sterilization as well as the ordinary Petri dish. Per pair 1.25 
 
 Culture Dish, White Metal, Friedberger-Kanten, rectangular form, 250 mm wide by 10 mm deep. 3.00 
 
 Culture Dishes, Gabritschewsky, as originally used for Tetanus cultures but as now used for growing 
 tissues in plasma. The culture is made on the under side of the lid. The circular concave por- 
 tion of the dish serves to collect the products of metabolism falling from the culture, the cir- 
 cular trough around the bottom dish being used for water. By means of the apertures provided 
 a slight turn o the lid permits or excludes the entrance of air into the culture compartment. Per 
 pair 75 
 
 Culture Dish, Porcelain, Neisser. Dishes are 100 mm in diameter x 10 mm deep and are furnished in 
 both black and white glazed porcelain. 
 
 Color ^'VTli te Black 
 
 Each,'.".'. "".60""' 775 
 
 Culture Dishes or Moist Chambers, large double dishes of heavy glass, with loosely fitting covers with 
 knob. 
 
 Inside heigth, mm _70 80 
 
 Diameter of cover, mm 200 240 
 
 Each 1-25 2.00 
 
 Culture Dishes or Moist Chambers, same as No. 25634 hi.it without knob on cover. 
 
 Inside heigth, mm J'O SO 
 
 Diameter of cover, mm "-00 240 
 
 Each 
 
 1.00 
 
No. 25670 No. 25G74 
 
 25642. Culture Dish Holder, Ravenel, for dishes 100 mm diameter, of spring brass, nickel-plated. A very con- 
 venient device for handling dishes in the incubator and sterilizer. 
 
 To hold, dishes 3 _6_ 
 
 Each 50 .75 
 
 2564S. Culture Dish Holder, of polished copper, with removable inside tray. To take 100 mm dishes. Height 
 9 inches 3.00 
 
 25650. Culture Dish Holder, of sheet copper, nickel plated, with door and handle. For dishes 100 ram in diam- 
 eter. Height 8 inches 6.00 
 
 25654. Culture Dish Holder, rectangular form, of nickel plated copper. For dishes 100 mm in diameter, . . 6.00 
 
 25658. Culture Flasks, Koch. 
 
 Capacity, cc 50 100 
 
 Each 12 .15 
 
 25662. Culture Flask, Fernbach, so-called Antitoxin flask. Shape as used in the Antitoxin Laboratories of 
 the Philadelphia Board of Health, 8 inches high and 10 inches in diameter at base 2.00 
 
 25666. Culture Flask, Freudenreich, with ear ground on, 25 cc capacity 35 
 
 25670. " " " withsideneek,capacity25cc .40 
 
 25674. " " Lister, for serum, capacity 500 cr 60 
 
 25678. " " Miquel, with flat bottom and ground on cap. Capacity, cc , . . _ 50 75 100 
 
 Each .35 "" .40 .45 
 
 25690. 
 25694. 
 
 No 256b2 
 
 " "" " ' _ " -^=^ No. 25ti'JJ 
 
 No. 25690 
 
 Culture Flask, Kolle, with indentation to prevent flowing out of medium. Flasks are about 3 cm deep. 
 As used in the preparation of typhoid vaccine in the U, S. Army Medical Department. 
 
 Diameter, cm 13 15 
 
 Each ~50 XO 
 
 Culture Flask, Roux, 220 mm long, 120 mm wide and 53 mm deep 80 
 
 " " Pioikowski, 140 mm long, 140 mm wide and 50 mm high 80 
 
25702. 
 25706. 
 
 25714. 
 25718. 
 
 Culture Flask, Martin, lui Lu.xiii, 
 
 Capacity, cc 
 
 Each 
 
 Culture Flasks, Chamberlantl. 
 
 Capacity, cc 
 
 Each 
 
 Culture Flasks, Miquei, pipette form 
 
 Culture Flask, Pasteur, witii side tubulations and ( 
 
 Capacity, re 
 
 Each,. 
 
 250 
 .50 
 
 Dnstricted neck. 
 
 500 
 .75 
 
 100 
 .40 
 
 1000 
 1.00 
 
 5 250 
 
 500 
 
 1000 
 
 .50 
 
 .60 
 
 .80 
 .30 
 
 250 
 
 500 
 
 1000 
 
 .50 
 
 .60 
 
 .80 
 
 Culture Flask, Pasteur, Jena Glass. Same shape as above. Recommended because of insolubility 
 
 of glass diirin;: sterilization. Capacity 500 cc 1,30 
 
 Culture Tube, Gayon, 220 mm lonp by 20 mm diameter 30 
 
 " " Roux, for potato cultures. 155 mm long by 20 mm diameter 10 
 
 No. i57t2 
 
 Cups or Cells, porous, of unglazcd porcelain, for use m batteries, etc 
 
 Height, mm 75 75 ilo 110 135 
 
 Diameter, mm _38 50 50 50_ _ _ _65_ ^80 80 
 
 Each 10 .15 ;i8 ...26 .30 ' .40 .55 
 
 Cupels, Brownite, for assaying, are absolutely uniform in compo-sition and density, give a lower silver 
 loss than bone ash, and are guaranteed against breakage in shipment. They should be hot 
 before receiving the button. 
 
 Diameter, inches 1 li U li 
 
 Height, inches s _t_ % 1 
 
 Per 100 1.00 1.25 1.75 "" 2.00 
 
 Cupels, Torry & Eaton, of best washed bone ash. 
 
 Diameter, inches 1 U IS " 
 
 Will absorb, grams 10 15 2tJ 
 
 200 
 
 _1J 
 2.50 
 
 • 100. 
 
 257.34. Cupel Rake, of iron, 24 inches long... 
 25738. " Shovel, of iron, 24 inches long. , 
 
 25742. Cupel Mould, of brass. 
 
 ■Size, inches 
 
 Each 
 
 2.00 2.25 2.50 3.00 
 
 30 
 3.40 
 
 3.75 4.00 4.50 
 
 2.50 
 
 2.75 
 
 >.00 
 .45 
 
 .45 
 
 1} 
 3.00 
 
0_ 
 
 -^33 
 
 Mao 
 
 No 25750 No 
 
 No. 25758 No. 2576! 
 
 ^^j™> 
 
 
 2rc 
 
 N». :257«G No. 25770 Na. 2577 ( No. 25778 No. 257S2 
 
 25762. 
 
 25766. 
 25770. 
 
 25774. 
 
 25778. 
 
 25782. 
 
 25784. 
 
 257S6. 
 25788. 
 
 25790. 
 25792. 
 
 
 .15 
 
 260 
 45 
 
 .16 
 
 300 
 40 
 
 .18 
 
 300 
 50 
 
 .16 
 
 315 
 65 
 
 .22 
 350 
 50 
 
 .24 
 
 365 
 65 
 
 .25 
 
 375 
 50 
 
 .26 
 
 450 
 50 
 
 250 
 40 
 
 .30 
 
 .35 
 
 .35 
 
 .45 
 
 .55 
 
 .50 
 
 .60 
 
 .50 
 
 .65 
 
 100 125 125 
 
 150 
 
 25 
 
 315 
 65 
 
 150 
 
 40 
 
 350 
 50 
 
 175 
 30 _ 
 .24 
 365 
 65 
 
 200 
 30 
 .25 
 375 
 50 
 
 210 
 
 _J0 
 
 .26 
 
 450 
 
 250 
 40 
 .30 
 
 500 
 
 .60 .50 .65 .75 
 
 300 
 
 75 
 
 .50 
 .70" 
 
 300 
 100_ 
 1.25^ 
 
 400 
 75 
 65 
 
 .90 
 
 400 
 _80 
 "1.25 
 
 Cylinders, with spout. 
 
 Heiglit, mm 100 125 125 150 150 175 200 
 
 Diameter, mm 25 25 40 25 40 30 30 
 
 Each 
 
 Height, mm 
 
 Diameter, mm 
 
 Each.. 
 
 Cylinders, with rim around top, top not ground. 
 
 Height, mm 
 
 Diameter, mm 
 
 Each Ti5 .16 .Ts 
 
 Height, ram 260 300 300 
 
 Diameter, mm 45 40 50 
 
 Each :B J5 ST .55 M 
 
 Cylinders, with enlarged top. Especially adapted for uae with hydrometers 
 
 Height, mm 350 
 
 Diameter at top, mm 50 
 
 " " bottom mm 40 
 
 Each 50 
 
 Cylinders, with ground rim at lop for use with glass plates. 
 
 Height, mm 200 300 
 
 Diameter, mm. 100 80 
 
 Each ^5 :M 
 
 Cylinders, with side funnel for acid chambers, so-called "drop cups." 
 
 Height of c^dinder. mm 125 
 
 Each 
 
 Cylinders, Graduated, with single graduations, anci spout, on foot. 
 
 Capacity, cc 5 10 15 
 
 Each ^^25 728 M 
 
 Capacity, ec 200 250 500 
 
 Each 75 M i.OO 
 
 Cylinders, Graduated, with double graduations, and spout, on foot. 
 
 Capacity, cc 5 10 25 50 100 
 
 Each 28 .30 .40 .50 ^65" 
 
 Cylinders, Graduated, with single graduations and ground glass stopper 
 
 Capacity, cc 10 25 50 100 150 
 
 Each 50 .55 .60 .80 .90 
 
 Cylinders, Graduated, same as No. 25778. but with double graduations. 
 
 Capacity, cc 10 25^ 50 100 JMO 500 100 200 
 
 Each ;50 .60 .70 .80 1.20 1.65^2^5 4750 
 
 Cylinders, Graduated, New Jena Glass, with single graduations. 
 
 Capacity, cc _ _50 100 _200_ 250 500 1000 
 
 Each .90 1.10 1.35 1.50 2.00 "3!00 
 
 Cylinder, Graduated, for use with the official Brown-Duvel Moisture Tester. With enlarged top, read- 
 ing in percentages up to 16%. See Bulletin 56 of lie U. S. Bureau oj Plan' Jmly!:try.. 40 
 
 Cylinder with Outlet but without spout, of well-annealed thin glass guaranteed to stand repeated steri- 
 lization; 4 inches in diameter and 15 inches high, with tubulation at the side; as used in the labo- 
 ratory of Soil Bacteriology of the U. S. Department of Agriculture 1.25 
 
 Cylinder, as used in testing sewage, with conical end graduated from to 50 ec, total capacity 1000 cc. 2.50 
 
 Cylinder, as above, of conical shape throughout, with graduations at points from to 100 cc, total 
 capacity, 1000 cc 2.25 
 
 .50 
 
 .60 
 
 50 
 
 100 
 
 .40 
 
 2000 
 "3.25 
 
 .50 
 
 3000 
 4.00 
 
 500 
 
 1000 2000 
 
 1 000 
 1.75 
 
 .80 1.00 
 So called "mixing bottle." 
 200 250 500 1000 2000 
 
 1.00 1.15 1.35 2.30 4.00 
 
ARTHUR H. THOMAS COMP ANY 
 
 Cylinders, Mixing, Precision, as used in the Hygienic Laboratory, of the U. S. Public Health Service for 
 determining the immunity unit in the standardization of diphtheria antitoxin. See Hygienic 
 Laboratonj Bulktin. No. 2i. These cylinders are standardized at 20° C. in accordance with the 
 requirements of the Bureau of Standards but are regularly furnished without certificate. With 
 ground glass stopper without constriction in neck and with flask shaped enlargement below 
 first graduation. Each cylinder of the series has a graduation of 10 cc in ,-oths, i.e. the capacity 
 to the beginning of the graduations is 10 cc and to the top of the graduations 20 cc and so on up 
 to 100 cc. 
 
 Graduations, cc^ 5-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100 
 
 1.90 
 
 Each.. 
 
 1.25 
 
 1.85 
 
 1.50 1.55 1.60 1.65 1.70 1.75 
 
 CYLINDERS. Precision, graduated by weighing at 20° C. in accordance with the specifications of the Physikalisch- 
 Technische Reichsanstalt, i. e., witii indivi iual control number, timi? of outfioi^f, all around g-aduations 
 for the whole centim'^ters and semi-i-ircular graduations for the fractions, etc. These cv'inders are 
 offered with our unofficlai factory certificate and with the Physikalisch-Technische Reichsanstalt cer- 
 tificate and control stamp i. e., the official certificate of the German government. Because of the 
 limited demand we do not carry these cylinders in stock with the offifial P. T. R. certificate but import 
 them on special order. We do, however, carry them in stock with our unofficial factory certificate. 
 These certificates are made out in the factory in exact accordance with the methods prescribed by the 
 P. T. R. and no Cylinder is certified unless the error falls within the limit permitted by the P. T. R. 
 The data on these certificates may be used as a check where cylinders are calibrated in the laboratory 
 or with entire rpliance upon the accuracv of the figures given. 
 
 Cylinders, Graduated, Precision, with single graduations and spout, adjusted for receiving, with unoffi- 
 cial factory certificate.. 
 
 Capacity, cc 10 25 50 100 250 
 
 Graduated in cc -h k \ 1 5 
 
 25800. 
 
 500 
 
 1000 
 
 Each 85 1.30 1..55' 1.35 1.90" 
 
 25804. Cylinders, Graduated, Precision, same as No. 25S00. but with double graduations; 
 factory certificate. 
 
 Capacity 10 25 50 100 250 
 
 Graduated in cc iV i s 1 5 ^^_^ 
 
 Each T25 ^60 1-90 1.50 2.25 2.70 3.50 
 
 25812. Cylinders, Graduated, Precision, with single graduations and ground glass stopper, adjusted for re- 
 
 2.35 3.05 
 
 with unofficial 
 
 1000 
 10 
 
 ceiving. So-called "mixing bottle; 
 
 Capacity, cc 10 
 
 Graduate in cc to 
 
 Each 1.20 
 
 Deflagration Spoons, of brass for burning phc 
 
 Di.imctor of bowI, inches , . . . 
 
 Each 
 
 Deflagration Spoons, same as above but of ii 
 
 Diameter of bowl, inches 
 
 Each. 
 
 dth unofficial factory certificate. 
 25 50 100 250 
 
 1.6 
 
 iphor 
 
 » 1.90 1.70 2.35 
 
 )US, sulphur, etc.. in oxygen. 
 
 lOOO 
 
 10 
 
 4.00 
 
 J. 
 .15 
 
 Deflagration Spoon, for decomposition of water by sodium; with brass gauze bow! and wooden handle .50 
 
25826. 
 25830. 
 
 25834. 
 25838. 
 
 25812. 
 25S46. 
 
 25850. 
 25854. 
 
 258.58. 
 25862. 
 
 25866. 
 25870. 
 
 25874. 
 25878. 
 2.5882. 
 
 25886. 
 
 No. 253G2 
 
 Demijohns, of glass, with rattan cover. Capacity, gallons 12 3 5 
 
 Each ;5(r ,75 1.00 Tso 
 
 Desiccator, Scheibler, e.\tra hne quality, with wide, finely ground flange to which covers are evenly 
 
 and accurately fitted. 
 
 Diameter, mm 100 120 150 200 250 
 
 Each 1.00 1:25 IM 2:50 4T5O 
 
 Desiccator, Scheibler, exactly like No. 25S30, 150 mm diameter, but with side tubolation to take 
 
 rubber stopper 2.25 
 
 Desiccator, Scheibler, exactly like No. 25834, but with a stout stopcock ground "in side tuljuiation. 
 
 Diameter, mm ^20_ 150 200 250 
 
 . Each. ......... .... 2.80 3.50" 5.50" 6.50 
 
 Desiccator, Scheibler, identical with No. 25830, but with ground in glass stopcock and hook in lid. 
 
 Diameter, 150 mm 3.50 
 
 " Scheibler, ordinary quality. Recommended as a very satisfactory desiccator at an 
 
 unusually low price. Shape same as No. 25830. 
 
 Diameter, inches 4 5 g 
 
 . Each. ,■■.:■, .60 ^0 1.25 
 
 Desiccator, Hempel, with glass stopcock and hook for suspension. Diameter 150 mm 5.00 
 
 Porcelain Plates, glazed, especially intended for use in Scheibler desiccators. On three small feet 
 and with from three to eight holes depending upon the diameter of the plate. 
 
 Diameter, mm 95 115^ 14Q ^ I90 240 
 
 Each. 75 .85 1.25" 2.06 2.50 
 
 Desiccator, Atwater, with triangle inside, diameter about 4} inches 2.00 
 
 Desiccator, Mitscherlich, with glass tripod for taking beal^ers and "deep veVsels, 150 mm deep, and 
 
 100 mm m diameter, with tubulation and ground in stopcock .... 3.00 
 
 Extra glass tripod for above .25 
 
 Desiccator, Fresenius. Diameter, mm .....[/..[.[.... ' ,S0 100 
 
 Each 1.00 1.20 
 
 250 
 10.00 
 
 230 
 13.00 
 
 Desiccator, Frnehling and Schullz, with glazed porcelain plate profusely perforated with small holes. 
 
 Diameter, mm 200 250 
 
 Each 7^0 
 
 Desiccator, Frnehling and Schultz, same as above but with stopcock in lid. 
 
 Diameter, mm 200 
 
 Each 9 15 
 
 Porcelain Plates, only, for Fruchling * Schultz Desiccator's", glazed and "profusely perforated with small 
 holes. 
 
 Diameter, mm 190 030 
 
 Each 1 75 2.10 
 
 Porcelain Plates, only, for Fruehling and Schultz Desiccators," with "holes M mm 'in diani'eter for tak- 
 ing crucibles. 
 Diameter, mm 19q 23O 
 
 Each,. 
 
 1.75 
 
 2.10 
 
ARTHUR H. THOMAS COMPANY 
 
 ^^Q- 
 
 ' j^^ 
 
 25894. 
 
 25898. 
 
 25926. 
 25930. 
 
 Desiccator, stoutly made to withstand considerable pressure, \^■ith glass stopcock, rubber stopper 
 
 and hook in lid. Diameter, 140 mm 5.25 
 
 Stopcock, only, for No. 25890 desiccator 1 .00 
 
 Desiccator, rectangular form, a new, very practical model. 
 
 Length, mm H5 185 
 
 \\ idth, mm HO 140 
 
 fleight, mm 90 90 
 
 Each 5.50 7.50 
 
 Desiccator, exactly same as No. 25S98 but with stopcock groun<l in side tabulation, but without porce- 
 lain plate as shown in illustration. 
 
 Length, mm 145 i,s5 
 
 Each 9.50 11.50 
 
 Porcelain Plates, rcctanguhir, glazed for use in either of above desiccators and as shown in illustra- 
 tion of No. 25902. 
 
 Length, mm 125 ITU 
 
 Width, mm (10 125 
 
 Each T;80 3^5 
 
 Note.— Desiccatora No. 2.533S and 25902 oaa be furnished in amber glasa on special order. 
 
 Desiccator, with Electric Hot Plate and Electric Fan. The electric motor and fan are mounted on a 
 nickel desiccator plate and motor may be operated by a three-volt battery. The air circulation 
 from the fan causes much more rapid drying. The tubulation is provided with glass stopcock 
 in addition to electrical connections so that the desiccator may be used for drying in vacuum 
 and with the electric hot plate in place on the nickel support becomes a small vacuum drying 
 oven. The electric hot plate is regularly furnished for connection with 110 volts d. c. ; 180 mm in 
 diameter. Complete with nickel support, fan, motor, electric hot plate for 110 volts and sup- 
 port, but without battery. 
 Duty Free 18.00 Stock 30.00 
 
 Dialyzers, consisting of an open top bell glass suspended in a glass jar. 'J'he large end of the bell glass 
 is covered with parchment. 
 
 Capacity, liters 2 4 
 
 Each 1^25 TiSO 
 
 Dialyzers, Graham. The inner glass to which parchment paper is fastened is supported by its rim 
 ujKjn the edge of the outer vessel. 
 
 Diameter, mm I^Uq 
 
 Each j_30 
 
 Dialyzer Tubing, of heavy parchment. 
 
 Diameter, mm 
 
 200 
 2.25 
 
 45 
 
 10 
 
 Per meter ^^ 
 
 Diamond, for writing on glass. A fine diamond mounted in a metal handle with removable^'cap ^.5(» 
 DifTiision Shells, Schleicher & Schiill No. 579. These shells offer a large dialyzing surface with the 
 
 smallest possible volume and enable work to be carried on with a small outside vessel Not 
 
 .suitable for Abderhalden technique. 
 
 ^'^'e. mm 100x10 100x35-40 
 
 Per box of 2.-; 3.15 7.35 
 

 No. 26000 
 
 No. 26012 
 
 25942. 
 25946. 
 25950. 
 
 25958. 
 25962. 
 
 25966. 
 25970. 
 25974. 
 
 No. 25962 
 
 YZING METHOD, ABDERHALDEN. Fur oonvenienee we aic iiating under this heading the special 
 Diffusion Shells, Fhisks, Tubes, etc., as used in the Abderhalden dialyzing method of serodiagnosis. 
 For Polariscope, etc., required for the optical method, see Polariscope No. 34380 with special electric 
 heating attachment No. 34392 and special tubes No. 34.396. 
 
 Diffusion Shells, Abderhalden, This is Schleicher & SchuU's No. 579a Diffusion Shell which differs 
 from the regular No. 579 in that they allow peptone to pass and retain the albumen. Size 50 x 16 
 
 mni. Per box of 25 3.00 
 
 Diffusion Shells, Tested, Abderhalden, as above, tested in Halle for their permeability for peptone 
 and retention of albumen, in accordance with the methods established by Abderhalden. In 
 
 sealed sterile bottles containing 25 each, Price 10.00 
 
 Fla.sks and Tubes, Abderhalden, for use with Diffusion Shells No. 579a for Abderhalden serodiagnosis 
 by the dialyzing method, consisting of a wide mouth special shape Erlenmeyer flask, permitting 
 the easy entrance and withdrawal of the diffusion shells. The size of these flasks is such that 
 the diasylate reaches a proper level after the diffusion shell has been filled with the serum to 
 be tested. The marks on the flasks and tubes render the measuring of identical movements 
 very easy. Both flasks and tubes are supplied in duplicate and each pair carries the same in- 
 dividual number, obviating the possibility of confusion between the tested and untested mem- 
 branes. As used in the Laboratory of Internal Medicine, Phipps Psychiatric Clinic, Johns 
 Hopkins University. Both flasks and tubes are of Jena glass. Flasks are marked at 20 cc and 
 tubes at 10 cc. 
 
 Flasks, as above described with identical numbers, per pair 60 
 
 Tubes, " " " " " . " " . " 50 
 
 Tongs, for the convenient handling and washing of the dialyzing shells, arranged for convenient open- 
 ing and closing by simple hand pressure; heavily nickel plated 3.50 
 
 Test Tube, with bulb to prevent boiling over and with two marks, at 10 and 12 cc and serial number. 
 
 Each ■, 25 
 
 Glass Bulb, with vents on the side for stoppenng above test tubes. Each .20 
 
 Water Bath, Abderhalden, with aluminum vane stirring device, of heavy copper, with Teclu burner 
 
 and inset for 25 of the above test tubes 25.00 
 
 Ninhydrin, (Triketohydrindene hydrate). Per ^V gram vial 25 
 
 Silk Peptone, Hoechst. Per gram 50 
 
 Placentapeptone. Per gram 5.50 
 
 Dish Boas, for feces experiments. Lower half of dish is black enamelled and upper half transparent. 
 
 ' With air-tight rubber ring and glass spatula .'{.50 
 
 Dishes, Crystallizing, of thin blown glass, high form with polished edges 
 
 Height, mm "K) 50 60 80 
 
 Diameter, mm J0_ _ 50 60 _ 80 
 
 Each iS -15 -16 .20 
 
 Dishes, Crystallizing, of thin blown glass, low form, with polished edges 
 
 Diameter, mm 30 40 50_ _60 70 
 
 Each -ll W -W -12 -ll 
 
 Diameter.mmV.V.::;.: 150 170 190 210 240 
 
 EjjI, 40 .50 .60 .70 .90 
 
 Dish, Crystallizing, of thin blown glass with polished edge; as used in tanning Laboratories 
 
 mm diameter 70 mm. Approximate weight 35 grams. Each 
 
 Dishes, Crystallizing, New Jena Glass, low form, with spout. 
 
 Diameter, mm 40 50_ 
 
 Each 17 •■* 
 
 Diameter, mm 100 125 
 
 Each -3* -60 .80 1.05 1.25 1.9 
 
 177 
 
 JiO 
 .19 
 
 150 
 .80 
 
 100 
 100 
 .25 
 
 .16 .18 
 270 300 
 1.50 2.25 
 
 200 
 1.05 
 
 120 
 
 120 
 
 730 
 
 100 110 
 
 .20 ,25 
 350_ 400 
 3.25 i.m 
 
 130 
 
 450 
 6.50 
 
 Height ,50 
 
 .28 
 250 
 1.25 
 
 90 
 
 300 
 
<^ 
 
 Nu. 26028— large 
 
 Dishes, Thiiringian Porcelain. ^IizliI inMile only, shallow form. Ilecommendeil as an inexpensive 
 dish for students use 
 
 Capacity, CO 20 3.5 .50 7.5 12.5 200 500 750 1100 
 
 Diameter, mm 58 JO 82 92 108 135_ 16 5 200 235 
 
 Each 07 .08 M ' .U .18 .20 .25 .35 .60 
 
 Capacity, cc 1500 2000 2.500 3400 4300 5200 7000 10000 
 
 Diameter, mm 265 285 305 315 34 5 375 415 45 
 
 Each M' i.lO 1.40 1.60 " 2.00 2.95 3.90 5.85 
 
 Dishes, Thiiringian Porcelain, glazed inside only, deep form, with heavy welted rim. .Same quality as 
 No. 26016. 
 Diameter, mm. ... 65 75 85 94 112 120 150 170 210 240 265 285 
 
 Capacity, cc 35 .50 7 5 100 170 225 450 600 115 1500 2250 2750 
 
 Each 10 .10 .12 .14 .17 .30 .40 .55 .70 .95 1.40 1.70 
 
 Dishes, Sanitats Porcelain, trade mark "blue arrow," glazed both inside and outside up to and in- 
 cluding 120 mm diameter size. Larger sizes glazed inside only as shown in large dish in illus- 
 tration. 
 
 Capacity, cc 20 50 75 90 115 160 225 240 350 
 
 Diameter, mm 50 70 80 ,85 95 105 110 120 150 
 
 Each 08 .10 .12 .14 .17 .20 .30 .35 .55 
 
 Capacity, cc 700 1000 1250 1500 2000 3000 5000 8500 1500O 
 
 Diameter, mm 100 210 235 2.55 275 300 .355 40 470 
 
 Each 90 .95 L35 1.55 1^95 2.65 3.95" 8.30 11.75 
 
 Dishes. Royal Berlin Porcelain, trade mark "blue scepter," glazed inside and outside up to and in- 
 cluding No. 5. Larger sizes glazed inside only and for a short distance below the rim on the out- 
 side, remainder of outside surface being unglazed. See larger dish of illustration. 
 
 Number 000 00 1 2 3 4 5 
 
 Capacity, cc 35 60 80 100 140 175 210 300 385 
 
 Diameter, mm 60 70 80 85 90 100 110 120 145 
 
 Each 15 .18 .21 .25 .35 .40 .45 .55 .70 
 
 Number 6a 6b 7 8 8a 9 10 11 12 13 
 
 Capacity, cc .535 690 765 1285 1430 2200 3250 5700 10000 16500 
 
 Diameter, mm 162 17(1 1.85 215 230 265 305 360 400 460 
 
 Each .8.5 .90 .95 1.20 1.75 2.10 4.00 5.60 13.50 22.50 
 
 Dishes, Royal Berlin Porcelain, satnc shape and execution as No. 2602S but with inside glazing of a 
 dark green color. 
 
 Capacity, cc 80 175 300 
 
 Diameter, mm SO 100 120 
 
 Each .60 1.00 ' 1.20 
 
 Dishes, Royal Berlin Porcelain, shallow form, with comparatively flat bottom. Glazed inside and 
 for a short distance below the rim on the outside, remainder of outside surface being unglazed. 
 
 Number 1 2 3 4 5 6 7 
 
 Capacity, CO 45 60 95 160 200 350 .550 
 
 Diameter, mm J70 80 95 105 120 140 160 
 
 Each 20 .25 " .40 .50 .60 .75 .90 
 
 Dishes, Royal Meissen Porcelain, trade mark "crossed swords" in blue, glazed inside and for a short 
 distance below the rim on outside, remainder of outside surface being unglazed. 
 
 Number 11 10 9 8 7 6 5 
 
 Capacity, cc 20 50 120 190 280 525 870 
 
 Diameter, mm 65 ' 8 3 110 123 1.35 _ _165_ 190 
 
 Each 18 " .20 .35 .40 .60 .85 1.20 
 
 Number 4 3 2 1 00 000 
 
 Capacity, cc 1100 1700 2250 37.50 4750 6200 8700 
 
 Diameter, mm 220 _250 275 300 340 Jmo 400 
 
 Each 1.45 1.70 2.10 2.75 4.00 fUJij jT!™ 
 
 Dish, Alundum, for incinerations, 45 mm diameter at top, 30 mm diameter at bottom, 22 mm high, 
 with wall 2 mm thick. These are furnished in either R.^ 84 or R\ 320 mixture, which should 
 be specified in ordering ; 35 
 
26036. 
 26060. 
 
 26064. 
 26068. 
 
 2«fl88. 
 
 26092. 
 26096. 
 
 shallow foiii 
 2 3 
 
 80 95 
 
 ■ilh Hat bottom 
 4 5 6 
 
 ' glazed inside only ' 
 
 40 
 
 70 
 
 ith 
 
 8 
 180 
 .34 .41 .51 
 
 vooden handle. 
 120 200 
 
 100 125 
 
 200 
 .68 
 
 525 
 170 
 1.35 
 
 Dishes Sdnitiits Porcelain, trade mark "blue arrow," 
 
 Number 1 
 
 Diameter, mm 70 
 
 Each 14 
 
 Dishes, Sanitats Porcelain, trade mark "blue arrow,' 
 
 Capacity, cc 
 
 Diameter, mm 
 
 Each 
 
 Dish, Thijringian Porcelain, glazed inside only, with heavy double welted rim. Deep form. As sup- 
 plied large chemical works. Dimensiona 430 mm diameter by 305 mm deep 12.00 
 
 Dish, Thiiringian Porcelain, glazed inside only, with heavy welted rim. As supplied to large manu- 
 factures. Capacity, CO 12,000 24,000 
 
 Diameter, mm 420 600 
 
 Each 4.75 12.00 
 
 Dish, Royal Berlin Porcelain, glazed, fiat bottom; 72 mm diameter by 16 mm deep 45 
 
 Dishes, Best Bohemian Glass, round bottom, with apout. 
 
 Diameter, mm 50 60 70 80 90_ 100 110 120 150 
 
 Each 15 .16 :i8 .20 .25 .28 .32 .35 .50 
 
 Dishes, Jena Glass, round bottom, with stout walls. For many purposes may be uaed in place of 
 porcelain and have the advantage of being transparent. With spout. 
 
 Diameter, mm 40 50 60 
 
 Each .15" .16 
 
 Diameter, mm 100 125 
 
 Each .34 " .55 
 
 .17 
 
 150 
 .73 
 
 70 
 
 .20 
 
 _200_ 
 
 .95 
 
 250 
 
 .29 
 300 
 
 _60_ 
 .17 
 150 
 .73 
 
 70 
 .20 
 200 
 .93 
 
 1.15 
 
 SO 
 .25 
 250 
 1.13 
 
 1.70 
 
 90 
 .29 
 300 
 1.70 
 
 lA 
 
 Dishes, Jena Glass, same as No. 26072 but with fiat bottom. 
 
 Diameter, mm 40 50 
 
 Each 7i5 ^W 
 
 Diameter, mm 100 125 
 
 Each .34 ^.55 
 
 Dishes, Opaque Fused Silica, highly glazed, with apout and round bottom. 
 
 Diameter, inches 2 2| 3i 
 
 Depth, inches tI 1 1^ 
 
 Each 1.00 1.15 1.23 
 
 Dishes, Opaque Fused Silica, highly glazed, flat bottom, with spout. 
 
 Diameter, inches 2i 
 
 Depth, inches I 
 
 Each 1.15 
 
 Dishes, Opaque Fused Silica, highly glazed, shallow flat form without lip. 
 
 nations, ignitions, etc., instead of platinum dishes. 
 
 Diameter, mm 35 44 51 
 
 Each 60 .60 .90 
 
 Dish, Opaque Fused Silica, highly glazed, for sugar analysis, of exactly the shape and dimensions of 
 
 platinum dishes usually used for the purpose, i.e. 51 mm diameter and 25 mm deep, flattened on 
 
 the bottom and without lip 1.25 
 
 Dish, Opaque Fused Silica, for tannin analysis, 82 nun diameter and 25 mm deep, flattened on the 
 
 bottom and without lip 1.25 
 
 1.23 1.35 1.83 
 
 As used for ash determi- 
 
 57 
 
 60 
 
 70 
 
 .90 
 
 1.00 
 
 1.25 
 
2fil08. 
 26112. 
 
 2(il2.S. 
 26132. 
 
 2S136. 
 26110. 
 
 26148. 
 
 26152. 
 26156. 
 26160. 
 
 Dishes, Preparation, of glass, with flaring sides and ground on covers. 
 
 Diameter, mm - -Hi 
 
 70 
 
 lUO 
 .35 
 
 50 
 100 
 
 70 
 
 Each 25 .30 
 
 Dishes, Preparation, of glass, low form. The lid is neatly fitted but is not ground on. 
 
 Height, mm 30 40 4.5 
 
 Diiiiuelcr, mm _50 70 90_ 
 
 Each 20 .25 .35 .40 
 
 Dishes, Preparation, of glass, same as No. 26104 but high form, i.e., 75 mm high by 50 mm diameter. 
 
 Very convenient for keeping clean micro slides on end. Each 25 
 
 Dishes, Preparation, of glass, with cover with knob, accurately ground air tight on broad flange. 
 
 Particularly convenient for use as receptacle for clean cover glasses. 
 
 Height, mm 30 35 40 45 
 
 Diameter, mm _50 65 _ m_ 100 
 
 Each 45 .50 .55 .65 
 
 Dishes, Preparation, of glass, so-called American Stender Dishes. Covers ground on. The largest size, 
 
 i.e., 90 mm high by 60 mm diameter is very convenient for clean micro slides. 
 
 Height, mm 24 30 35 90 
 
 Diameter, mm 36 .50 (30_ _ 60 
 
 Each 08 " .10 .15 "' .15 
 
 Dishes, Stender, of glass, for biological preparations, staining, etc., with covers of polished plate glass 
 
 accurately ground on. These are the original Stender dishes of German make. 
 
 Height, mm 25 30 35 40 50 
 
 Diameter, mm J) 50 JjO 80 100 
 
 Each 25 .25 .30 .40 .50 
 
 Dishes, Aluminum, with straight sides and flat bottom, as used in milk 
 
 Diameter, mm 
 
 Depth, mm ^18 
 
 Each 
 
 Dish, Aseptic Enamel Ware, of seamless steel white enamelled. Both acid and fire proof. Diameter 
 
 41 inches, depth 2^ inches ; 40 
 
 Dishes, Iron, lined with white porcelain inside and blue eniimel outside. With handles and spout. 
 
 DiaiiKtcr. mm 10 120 1 5 180 200 240 300 _ 36 400 
 
 Each 36 .50 .80 1.00 " 
 
 Dishes, Lead, Diameter, inches 2 2j 3 85 
 
 Each .10 .12 .16 .20 
 
 Dishes, Pure Wrought Nickel, with spout. Best imported onality with 
 
 Diameter, mm 
 
 Each 
 
 Dishes, Pure Silver, per gram 
 
 Diameter, mm .50 65 75 90 100 
 
 Approximate weight in grams 45 75 100 125 175 
 
 Dishes. Tin Foil for milk analysis; so-called "bottle caps." Size, inches 
 
 Per 100 
 
 120 
 
 140 
 
 60 
 
 .90 
 
 1.00 
 
 .50 
 
 
 
 
 65 
 
 75 
 
 90 
 
 IS 
 
 20 
 
 22 
 
 .30 
 
 .40 
 
 .50 
 
 1..50 2.25 3.00 4.20 
 
 .35 .50 
 
 trace of manganese. 
 60 SO 100 
 
 .70 1.25 "1.60 
 
 10 
 
 125 
 
 320 
 
 2J- X f 2 jxlA 
 
 1.25" 1.15 
 
 Dish, Weighing, with Counterpoise, of aluminum, shallow form. Capacity, cc 10 
 
 Each ""2JJ0 2^25 
 
 Dish, Weighing, with Counterpoise, of German silver. For Weighing Sugar Samples 3.2.? 
 
 1.80 
 30 
 
I 1^ 
 
 
 -" """""" " "^^^-^ 
 
 
 
 N9 1 
 
 ^^if: 
 
 — ^ — 
 
 ) 
 
 ^^3r= 
 
 ;-ii HI 11 111 — r 
 
 , _ -< 
 
 
 No 
 
 r 
 
 '-- ^— 
 
 No 
 
 
 ■.■■^■- — ri7 
 
 -_! iiiiiiiiiiiiiii n 
 
 .^.«-^ 
 
 26200. 
 26204. 
 2620S. 
 26212. 
 
 26216. 
 26220. 
 26224. 
 26228. 
 26232. 
 26236. 
 26240. 
 26244. 
 26248. 
 
 26252. 
 
 26256. 
 
 DISSECTING INSTRUMENTS 
 
 Blowpipe, for zoological work, of nickeled metal, 5 inches long .15 
 
 Forceps, Artery, of nickeled steel, bent form, self-closing, with corrugLited points, 55 mm lung 40 
 
 Forceps, Artery, same as No. 26204 but straij;lit 40 
 
 " Bone-Cutting, strong straight blades, witlL pinloss lock joint permitting separation for cleaning. 
 
 Length, mm 200 225 
 
 Each 2.50 2.75 
 
 Forceps, Bone-Cutting, of nickeled steel, with strong curved blades, 125 mm long 80 
 
 " Dissecting fine, straight, smooth points, 95 mm long 20 
 
 " " curved, with fine file-cut points and guide pin, 120 mm long 35 
 
 " " of steel, heavy, with straight, blunt, corrugated points, 110 mm long 15 
 
 Forceps, Dissecting, with fine straight corrugated points, 115 mm long 40 
 
 " " " " curved " " 110 mm " 40 
 
 " ' " medium fine, straight corrugated points, 115 mm long 40 
 
 1 11) n 40 
 
 •' t tit 1 i I t T ng 1 mm 105 11.5 130 145 
 
 Each .40 .40 .40 .40 
 
 Forceps, Dissecting, he; t (J t 
 
 Forceps, Dissecting, ' 
 
 No. 2r,2(;4 
 
 26260. Hooks and Chains, nickel plated, with sharp points 20 
 
 26264. Double Hooks, of steel, nickel plated 25 
 
 26268 Knife, Brain, with very thin blade of finest steel, in ebony handle. Length of blade 1S5 mm, width 26 
 
 mm 1.50 
 
 26272. Knife, Cartilage, all steel, with nickel plated handle, with 45 mm cutting edge 30 
 
 26276. " " (Prosecting Knife), with ebony handle and heavy blade thick at the back. 
 
 Length of cutting edge, mm _ 70^ _ _90 
 
 Each ^75 1.00 
 
 26280. Knife, Virchow, 3§ inches length of cutting edge 1.50 
 
26288. 
 26292. 
 26296. 
 26300. 
 26304. 
 26308. 
 26312. 
 26316. 
 26320. 
 26324. 
 
 26328. 
 26332. 
 
 Bone Saw. of steel, nickel plated, with detachable blade for sterilization. Length of blade 200 mm. 3.00 
 
 Needle, Dissecting, with ebony handle, straight and sharp, 135 mm long .30 
 
 " " " curved and sharp, 130 mm long 35 
 
 " blunt, 130 mm long 35 
 
 " " " half spear shaped, 130 mm long 35 
 
 spear shaped, with double cutting edge, 125 mm long 35 
 
 harpoon shaped, with two cutting edges and 145 mm long 60 
 
 hook shaped, 145 mm long 35 
 
 Dissecting Needle, cheap form, straight, in cedar wood handle. Per dozen 30 
 
 " " " " bent " " " " Per dozen 30 
 
 Needle Holders, of bone with clamp holding .any needle. With one straight needle. 
 
 Length, mm 85 110 
 
 Each .07 .10 
 
 Needles, for Holder No, 26324, of steel, 50 mm long. Style _A B C D 
 
 Per ten 05 .07 .05 .05 
 
 Oil Stone, for sharpening scalpels, 4 inches long 60 
 
 (\ 
 
 e 
 
 1 
 
 SCALPELS, DISSECTING, are carried in the following grades:— 
 
 Quality A instruments are of the best attainable quality, being made by the same makers and of 
 
 the same material as the highest grade minor operating knives. 
 
 Quality B instruments are of usual quality for general laboratory work. 
 
 Quality C instruments are entirely suitable for students work where instruments are used for one 
 
 course in dissecting only but are not recommended for permanent use where they are to be re- 
 peatedly resharpened. 
 26336. Scalpels, Dissecting, quality A, in ebony handle. Special shapes. 
 
 Style ABC 
 
 Length of cutting edge, mm 35 35 35 
 
 Each 1.25 1.25 1.25 
 
 26340. Scalpels, Dissecting, quality A, in ebony handle. Regular shapes. 
 
 Length of cutting edge, mm IS 25 32 
 
 Each 1.00 i.OO l700 UJO IM IM 
 
 D 
 
 ^10 
 
 1.25 
 
 38 
 
 E 
 50 
 
 F G 
 
 23 26 
 
 .25 
 
 1.25 
 
Scalpels, Dissecting, quality A, all steel. Easily cleaned and sterilized. Regular shapes. 
 
 Length of cutting edge, mm 25 
 
 Each 1. 00 
 
 Scalpels, Dissecting, quality B, with ebony handle. Special shapes. 
 
 fityle A B C D 
 
 Length of cuttingedge, mm.. , 35 3.5 35 10 
 
 Each 'M ~ .40 .40 .40 
 
 Scalpels, Dissecting, quality B. with ebony handle. Regular shapes. 
 
 Length of cutting edge, mm 18 25 32 
 
 Each ' .40 .40 .40 
 
 Scalpels, Dissecting, quality B, all steeL Regular shapes. 
 
 Length of cutting edge, mm 25 _ 
 
 Each .45 
 
 Scalpels, Dissecting, quality C, with ebony handles. Regular shapes. 
 
 Length of cutting e<lge, min 25 
 
 Each 2.5 
 
 .00 
 
 1.00 
 
 1.00 
 
 E 
 60 
 
 F 
 23 
 
 G 
 26 
 
 40 
 
 .40 
 
 .40 
 
 38 
 
 4.5 
 
 M 
 
 .40 
 
 .40 
 
 .40 
 
 32 
 
 3S 
 
 45 
 
 2G376. 
 26380. 
 
 No, 2fia8CI 
 
 Scissors, Dissecting, with fine points and screw joint, length 150 mm; regular quality. 
 
 Style Str aight Curved on edge Curved o n fla t 
 
 Each 750 /?5~ .75 
 
 Scissors, Dissecting, with fine points and aseptic lock joint, length 150 mm. Finest grade of surgi- 
 cal scissors. 
 
 Style ; Straight Curved on edge Curved on flat 
 
 Each ; .90 ~ ' LOO ~ " LOO 
 
 Scissors, Dissecting, medium weight, with straight points, L50 mm long, A low priced scissors for 
 student work 25 
 
 Scissors, Dissecting, same size and style as above, but better quality 40 
 
 Scissors, Dissecting, medium weight, with screw joint, 115 mm long. 
 
 Style With sharp points With one blunt point 
 
 Each .60 .60 
 
 Scissors, Dissecting, medium weight, with one sharp and one blunt point and aseptic lock joint. 
 Finest grade of surgical scissms. 
 Length, ram , 105 115 125 
 
 Each . .~'7ri .90 "" Too 
 
 No. 2i;:)S,S No. 2U392 
 
 263SS. Scissors, Dissecting, heavv, with one sharp and one blunt point and screw joint. 
 
 Length, mm ". J25 140 150 175 
 
 Each .65 " .80 .90 1.00 
 
 26392. Scissors, Dissecting, heavy, 140 mm long, with both blades blunt and with aseptic lock joint. Finest 
 grade of surgical scissors 1.00 
 
ARTHUR H. THOMAS COMPANY 
 
 26400. 
 
 26404. 
 26408. 
 26412. 
 26416. 
 26420. 
 26424. 
 26428. 
 26432. 
 26436. 
 26440. 
 26444. 
 26448. 
 
 Scissors, Dissecting, Coronary Artery, with oni; |..i-..l>o puint. As used in Jahns Hopkins University 1.25 
 " , , , '' with liandle of genuine ivory, for the finest invertebrate dissecting. Length of 
 
 blades 10 mm 3 qq 
 
 Section Lifter, nickel plated. Total length 100 mm, widtli 18 mm! 10 
 
 " " with ebony handle. Width of small blade 6 mm, width of larger blade 10 mm ^50 
 
 similar to No. 26408 but with only one blade. Width of blade 6 mm .35 
 
 with ebony handle and very flexible blades. Width of blade 20 mm 35 
 
 " same as No. 26416 but width of hbde -35 mm . 
 
 perforated, for handling 
 
 Seeker, or Probe, with the curved end shm |>I- 
 
 " " " Mall form. As used in Jr.' i 
 
 Cartilage Shears, uf nickeled steel. Tot;il im 
 
 Tenaculum, of steel, with ebony handle and si 
 
 " all steel, 160 mm long 
 
 Dissecting Instrument Cases, in the following 
 Tjpe A— onp fol-l U-ii-h.Mvttr' <--:^9<- wi'ii - 
 Type E— two l".,l:! !■■ -i,. . r. .■.,-, -■■ r", 
 
 T\pe C— two lull ■ ■■! I ir .,,. M I ,|. 
 
 Type D— tlHTT im.l ., ■ „,.,.,, i,.,,i 
 
 Tyi.e 
 
 Each 
 
 '■'P'-r'Hrto-r^- Wi.jfl- nf top 18 mm 50 
 
 ■!"■■■' ■ I ■ ' II 1 1' II ■ -)i:irp edge 20 
 
 ^■;>' ' I- M.':ii IS..1,.,,| 40 
 
 I' ■■'"I '. iviil, ,,l l.lndes, 60 mm 2.25 
 
 rp lii.iik. Length IGIJ inm .25 
 
 ■■ 40 
 
 '. il li velvet lining, and chamois protecting flaps. 
 
 \v ith velvet lining and chamois protecting flaps. 
 
 A B C_ D 
 
 25 .50 .90 1.25 
 
 DISSECTING INSTRUMRNTS IN SETS The following sets have been prepared as being those mostly in 
 demand. \\ . ,i.,,,, ! , ii|> special sets, utilizing, if possible, the standard types of cases as listed above, 
 and in acr.ii.' ,1 , r\ i liP requirements of the practice in vogue in any laboratory. 
 
 264.'>2. Dissectinii ,s<>!. .■■.hm-i mii of one-fold leatherette case with name card inserted and one forceps, one 
 
 scalpel, two needles, one scissors, one rule and one pipette 1 00 
 
 Dissecting Set, consisting of the followdng instruments in leatherette case No. '26448 Type A. '. '. ' L25 
 
 J S°- «n?5S- Scalpel, with ebony haadle and 38 mm clgo. I No. 2G224. Forrepa, fine, curved points 
 
 m"' f^ll' l,"^^"' ^",'^di'ira straight. 2 No. 2B324. Needle Holders, fitted with needles. 
 
 1 No. 26228. Forceps, blunt. I No. 3UD0. Celluloid Measure (not shown in illustmtion.) 
 
 264;>6. 
 
 26460. 
 
 Dissecting Set, consisting of the following instruments in leatherette case No. 26448 Type B. 
 Scalpel, with ebony handle and 4.1 mm e(ige. 1 No. 2(i272. Cartilage Knile, all ateril. with 45 m: 
 
 I No. 2G3fiO. 
 
 1 No, 2fi372. 
 
 1 No. 262S2. 
 
 1 No. 2R440. 
 
 Sciaaors, medium, straight. 
 
 Forceps, heavy, straight, for vertebrate uoj 
 
 Tenaculum. 
 
 1 No. 2(i272. 
 
 1 No, 2fi2M. 
 
 1 No, 2i;200, 
 
 1 No, 31100. 
 
 Triple ' 
 
 RIowpipe. 
 
 Celluloid .Measure (not shown ii 
 
 , 2.25 
 
ARTHUR H. THOMAS COMPANY 
 
 264(j4. 
 
 
 
 26i68. 
 
 1 No. 2G360. Scalpel, with ebony handle and 
 1 No. 26360. '■ " " , 
 
 1 No. 2e3S4. Scissors, fine, straight, 
 1 No 26372. " medium, straight. 
 
 1 No. 26224. Forceps, fine, curved points. 
 Dissecting Set, ronsisting of the following instrument 
 and chamois protecting flaps, No. 26448, Type C 
 ! No 26352 Scalpel, with ebony liandle and i5 mm edgo, 
 1 No! 26352. " " . " " ^ " 2o " 
 
 1 No 26376. Scissors, medium, straight, nickeled. 
 1 No 262S2. Forceps, heavy straight, for vertebrate "ork. 
 I No. 26440. Tenaculum. 
 26472. Dissecting Set, consisting of the following instruments 
 and chamois protecting flaps, No. 2644S Type D 
 1 No 26356. Scalpel, mU steel, mtll 4.^ mm edge. 
 
 1 No. 2635G. " ■■ ;; ;; ^? «;/" „ 
 
 1 N^. 26356. '• ' ..."., , J 
 
 I No 2C364. Scissors, fine, straight, nickeled, 
 
 J No. 26364. " •' ,. curved., . . ^ 
 
 1 No 263S0 " medium, straight, probe point. 
 
 1 No' 26248 " medium, heavy, straight, 115 lu 
 
 1 No. 26228. Forceps, medium, Ijlunt poii 
 
 
 2 No. 26324. Needle Holders, S5 mm lo 
 
 2, fitted with 
 
 needles. 
 
 
 1 No. 33788. Section Razor, with folding h 
 
 ndle. 
 
 1 No. 31100. Celluloid -Measure (not shown 
 
 
 ts in two-fold morocco c;ise. witli \ 
 
 (.lv,.t lininji 
 
 
 . 3. .50 
 
 1 No. 26272. Cartilage K.iife, all .-^u-^l. uirl, 
 
 
 1 No. 26428. Seeker. 
 
 
 I No. 26260. Triple Chain and Hook. 
 
 
 1 No. 26200. Blowpipe. 
 
 
 1 No. 31100. Celluloid .Meusure (not .-ihow.. 
 
 iij illustration. 1 
 
 s in three-fold morocco cat^e with \ 
 
 civet lining 
 
 3 
 
 8.00 
 
 1 No, 26252. Forceps, for vertebrate work 
 
 
 1 No. 26272 
 
 Cartilage Kniie, all steel, 45 m 
 
 
 
 
 
 
 
 
 1 No, 26260 
 
 Triple Chain and Hooks. 
 
 
 1 No. 2620t 
 
 Blowpipe. 
 
 
 :! No. 26204 
 
 ScrraSnes (Artery Forceps.) 
 
 
 1 No. 31100 
 
 Celluloid Measure (not shown 
 
 In illustration.) 
 
 1 No 262-18. Forceps, 1 
 
 
 1 long. 
 
STOKES AUTOMATIC WATER STILLS 
 
 I'.y ;i pidiMitcil i.'onf^ti-urtion tlie Stokes Automatic 
 ritill accomplishes two novel results. First — It utilizes 
 the heat generated in tlie S(ill foi' preheating the in- 
 coming raw water to the boiling yjoint. By this arrange- 
 ment a very small quantity of live steam is required to 
 operate the Still after it is once started. Secondly — 
 By preheating the feed water before it enters the dis- 
 tilling chamber, ammonia and other gases, due to impu- 
 rities in the raw water, are largely liberated and escape 
 into the atmosphere through an opening in the condenser 
 provided for this purpose. This is a very important 
 feature, for by driving off these gases before the water 
 enters the distilling chamber it prevents their reabsorp- 
 tion by the distilled water. 
 
 The Stokes Automatic Stills are made in five 
 sizes; the smallest, No, and No. 00 are heated by 
 gas, gasoline burner or steam coil, and the other 
 sizes; Nos. 1 to 4 are heated with live steam. The 
 principle upon which they operate is as follows: 
 The feed or raw water enters at (H) surrounds the con- 
 denser tubes (Cj and serves first to condense the steam 
 generated in the Still (B) as it descends the condenser 
 tubes, converting it into distilled water; in so doing 
 the raw water becomes heated to the boiling point by 
 the time it reaches the top of the condenser where the 
 ammonia and other gases escape into the air through 
 the opening (F). A part of this feed water escapes over 
 the goose-neck (E), either into a waste pipe or cistern, 
 and the balance passes into the Still through the pas- 
 sage (M), 
 
 By referring to the illustration, it will be seen there- 
 is a zone of water at the top of the condenser, which 
 being above the outlet to the overflow (G), is not drawn 
 off except to replenish the water in the Still as it evap- 
 orates. This zone of water at the top of the condenser 
 is constantly kept boiling by the steam from the Still 
 descending the condenser tubes, and it is here the am- 
 monia and other gases are liberated. The Still is heated 
 by live steam with a pressure of twenty pounds or over, 
 whi'.-h circulates In the copper coil (D), and serves to 
 boil or cvupiirMfe llic raw water. The distilled water 
 comes out at (J) and can be piped to any receptacle. 
 The condenser tubes evtend to the extreme top of the 
 steam chamber and high above the water level, so there 
 is no danger of water being carried over by steam. The 
 Still can be flushed for cleaning by opening a valve 
 connecting with the drain, or by removing the copper 
 lid on top, the interior can be easily scrubbed. 
 
 The heating coil is made of copper and will stand a. 
 steam pressure of 250 pounds. It is so arranged that 
 it can be detached from the Still for cleaning. This is 
 a very important feature, for scale will form rapidly on 
 any heating surface where hard water is being distilled 
 and unless I ho Still is ronstructed so this scale can b& 
 removed quickh' tlic Si ill soon loses efficiency and ceases 
 to operate ni'opcrly. 
 
 The condenser cylinder ami distilling chamber are 
 cast iron, the latter galvanized to resist corrosion. The 
 condenser tubes arc brass, lined both inside and out 
 with block tin. Tli>--r -.n-r liell with srrcw ferrules so 
 111.' lubes can be iT'iiin^erl li ,,(T--inii >;lM-iild demand. 
 'I he iii^irihole en\ri ni, il,r i<.|< i, ru[,|>rr, I in lined. 
 These Stills are of the bracket type, as this arrangemciil nffers the gre:ih-l ro^nmuy nf ^pa<■e aivl is more 
 sanitary than mounting them on floor stands. .... _.,, , 
 
 The cost of producing distilled water with the steam apparatus under ordmary conditions is one-hlth to one- 
 quarter of a cent a gallon; this includes the cost of both the si cam and water required. The quantity of raw 
 water required to p'roducc each gallon of distilled water depends on the temperature at which the distilled 
 water is delivered by the Still. Under average conditions it requires about eleven gallons of raw water to 
 produce one gallon of distilled. . , , ,■ r ± j ^ ^-l. u 
 
 As these Stills are self-contained and require only the two connections for water and steam, they can he 
 installed at very small expense. Thev are shipped set up ready for connecting the steam and water. 
 
 The capacity of the steam Stills is based on having live steam of 20 to 40 pounds pressure at the Still. 
 
H O M 
 
 We (guarantee these Stills to have the capacities stated above and to deliver pure water, free from any con- 
 tamination. Wc will ship them on 30 days' approval to any one in the United States where satisfactory reference 
 is furnished. 
 
 We supply copper tin-lined or glass-lined steel tanks for storing the distilled water m any capacity up to 
 1000 gallons. 
 
 26500. Distilling Apparatus, Stokes Automatic 
 
 Size 
 
 Capacity per hour, gallons 
 
 Each 
 
 Gas Heating; height 24 inehcs weight :i.) llj,- 
 
 Distilling Apparatus, Stokes Automatic, same as No. 00 of No. 
 
 ing chamber, capacity 1 gallon per hour 
 
 18.00 
 
 26500 but with steam c 
 
 000 
 
 inside of boil- 
 25.00 
 
 27.00 
 
 Distilling Apparatus, Stokes Automatic, same as No. 26500, equipped with 1 gallon gasolene storage 
 tank, connecting iron piping and gasolene burner; with tank arranged to hang on the wallalong- 
 side of the still. The burner for the ^ gallon size consumes one gallon of gasolene in ten hours. 
 
 Capacity per hour, g;illons 5 
 
 Each "25:06 
 
 Distilling Apparatus, Stokes Automatic, Steam Heating. 
 
 Size 1 2 ; 
 
 Capacity per hour, gallons 5 10 2. 
 
 Weight, lbs 275 325 751 
 
 Height, feet Sh 4?, : 
 
 Each 100.00 150.00 2.>0.0( 
 
 4 
 
 5 
 
 CO 
 
 100 
 
 200 
 
 1000 
 
 ,ng Iho-se uainu STOKES AUTOMATIC WATER STILLS, are (he fall 
 Kellogg Food Company 
 Inlernatianal CreasoUng Company 
 Diamond Rubber Company 
 Keystone Watch Case Company 
 Alan Wood Iron & Sleel Company 
 Republic Iron and Steel Company 
 Pennsylvania Sleel Company 
 American Can Company 
 New Jersey Zinc Company 
 Pennsylvania Salt Manufacturing Company 
 E. I. du PonI de Nemoura Powder Company 
 Philadelphia & Reading Railway Company 
 
 Texas Stale College of AHricullural , 
 University of Washington 
 ilniversity of Miasouri 
 Virginia Polytechnic Inslilule 
 Indiana State University 
 University of Cincinnati 
 Pennsylvania State College 
 Battle Creek Sanitarium 
 New York State Hoj^pital for the Im 
 German Hospital iPhiladelpliia) 
 U. S. Department of Agricullure 
 U. S. War Department 
 
T H O M 
 
 No. 26524 
 
 265l(). Distilling \pp iralus B irnstead Automatic, Type G, for Gas Healing, yielding chemically pure distilled 
 « iti 1 w illioiii I mil II nil i ^ascw. or organic impurities; substantially built of copper, nickel plated. 
 
 < t]MMt\ p.i l„iui .illinis I U- 2 _ _5 10 
 
 Each 45.00 50.00 75.00 125.00 225.00 
 
 20520. Distilling Apparatus Barnsteid Automatic, Tvpe E; for Electric Heating, cupacity 1 gallon per hour. 
 
 luinut " 110 volts 220volts_ 
 
 Each 55.00 ~65.00 
 
 26324. Distilling Apparatus, Barnstead Automatic, Type S, for Steam Heating; of heavy copper and composi- 
 tion, thoroughly coated with pure block tin on all parts that come in contact with the water. 
 
 Capacity per hour, gallons 2 .5-7 10-15 1.5-20 20-25 25-30 _ 50 75 
 
 Each 75.00 115.00" 170.00 2S5.00 .300.00 430.00 .540.00 775.00 
 
 N«- 2r,.-,2s No. 2652S No -hjJ- 
 
 Distilllng Appanilus. Jewell, Inr u.^^c willi g;i.-^; Iiighly recommended i'or llu'ir simpln ^t^ in i <lui d)ihty; 
 .substanl iiilly Imilt. ;unl :ill jiarts easily accessible; boiling chamber is of iron enimelled inside 
 and liiiislurl nuii^iilr wiUi :iliuniDum bronze paint; condenser of iron. Can be tuinishLd on older 
 wilh i'[i|i|jiT Imdiiii; riridibcr, nickel plated outside and tinned inside. 
 
 <_'ap:ii'ity per hour, gallons .' 1 l-J 
 
 Each 25.00 45.00 65.00 
 
 Distilling Apparatus. Automatic, for gas. Of cold rolled copper, lined througliuut with block tin, with 
 top of retort removable for cleaning. 
 
 Capacity per hour, liters _2 4 
 
 Each...~ 15.00 25.00 
 
raft' 
 
 Distilling Apparatus, Automatic, U laches in diameter by 13 inches high, made of heavy spun copper 
 without soldered seams; capacity 2 iitera per hour with a burner using 10 cu. ft. of gas per 
 
 hour 15.00 
 
 Iron Tripod, for use with above still 1.00 
 
 Distilling Apparatus, Femel, Patented, capacity 5 liters per hour; delivers absolutely pure and sterile 
 distilled water. Highlv recommended and widely used in Germany. 
 Duty Free 42.50 Stock fiO.OO 
 
 Distilling Apparatus, for steam, designed for experimenta. 
 or solids requiring agitation with high heat. 
 
 Capacity, gallons 
 
 Each ~i3.75 
 
 tion of heavy ods and other liquids 
 1 L' 3 5 
 
 24.00 3(5.00 42.00 54.00 
 
 Distilling Apparatus, consisting of a tin-lined copper retort with zinc condenser with block tin 
 
 worm, receiving funnel for cold water and outlet for hot water. 
 
 Capacity, gallons __5 1_ 2_ '3 5 
 
 Each ^ 12^00 ^.00 18.00 ^23^50 32^00 
 
 Note — For condenser only see No. 2504S and for retort only see Xo. 46012. 
 
 Distilling Apparatus. Automatic, for making distilled water by steam heat; of heavy copper with steam 
 
 coil near the bottom and provided with an automatic valve which controls the water supply; 
 
 also water gauge and union for connecting with condenser No. 25048 or other form. 
 
 Capacity, gallons 3 5 
 
 Each 29.25 32.25 
 
No. 2655G No. 265b0 No 265 >1 
 
 26556, Distilling Apparatus, of lieavy (^-opper, all scams brazed, intended f i 1 li^l t nj i ture uith flanges 
 secured by six thumb screw clamps, easily taken apart for cleaning. 
 
 Capacity, eallonp ^ 1 - 3_ 
 
 Each 23.25 25.50 36.75 51.00 
 
 2fi560. Distilling Apparatus, for Determination of Ammonia in Water. The in!et tube permits the introduction 
 of the permanganate solution into the flask after the distillation of the free ammonia; with mer- 
 cury' seal providing a perfect joint and easy disconnection 7.00 
 
 26564. Distilling Apparatus. Vacuum, for evaporations or distillations under diminished pressure. Consisting 
 of a porcelain dish 160 x SO mm, 2 liters capacity, glass dome with tubulation for thermometer 
 and side tube, and rubber fitting between dome and porcelain dish. Without thermometer. . 7.50 
 
 .No- 2l.r,i:)i No. 26584 
 
 26568. Distilling Apparatus, Vacuum, with east iron water bath, white enamelled inside, and tripod, but 
 
 witliiiut buriicr or thermometer 10.00 
 
 26572. Porcelain Dish only, 160 x 80 mm, 2 liters capacity, for either No. 26564 or No. 26568 5.00 
 
 26576. Glass Dome, only 1,75 
 
 26580. Rubber Ring, only 1.00 
 
 265S4. Distilling Apparatus, Vacuum, consisting of copper water bath with stopcock, on tripod, porcelain dish 
 
 with glass dome fitted air-tight by means of gasket and glass side tube for side of dome, but 
 
 without thermometer. 
 
 Capacity of ]jorcelain dish, liters i; 2-J 
 
 Each "22.50 30.00 
 
H O M 
 
 
 No b5 S No. Julias 
 
 i^*^ Dist liing \pparatus Vacuum sane is !No 26584, arranged for ilistillations but with the 
 
 ot V uun pump condei er ga ipe and glass bottle. 
 
 Capacity of porcelain dish, liters 
 
 Duty Free 
 
 Stock 
 
 26592. Porcelain Dish only, with tin ring 
 
 26596. Glass Dome, only 
 
 26600. Glass Side Tube, only 
 
 26604. Rubber Rings, only. .' 
 
 2G608. Glass Reservoir with metal top, with tabulations, K^uge, filter pump and stand. For uhc 
 
 in place of gauge, condenser, etc., as listed under No. 265SS. 
 
 Duty Free 7.50 Stock 
 
 li 
 
 n 
 
 28.05 
 
 36.30 
 
 42.50 
 
 55.00 
 
 7.50 
 
 10.05 
 
 3.00 
 
 4.20 
 
 .45 
 
 .60 
 
 .85 
 
 1.40 
 
 with No 
 
 26584 
 
 «^ 
 
 No. 26GI2.16-2I) No. 2G62J 
 
 26612, Distilling Tube, plain form, for fractional distillation.. 
 
 26616. " " with one bulb 
 
 26620. " " " two bulbs 
 
 26624. " " Glinsky, with glass valves. 
 
 Length, mm 
 
 Each. . 
 
 400 
 1.50 
 
 26628. Distilling Tube. Le Bel-Henninger, with two bulbs 1.00 
 
 26632. " " " " ■' three " 1.25 
 
 26636. " " " " " four " 1.80 
 
Dislilling Apparatus, Vacuum, consisting of metal retort heavily tinned inside, with steam jacket and 
 stopcock, with drip cup, stopcock for live steam connection, filass dome, copper condenser with 
 block tin tube and filter pump, and {^lass overflow reservoir with metal top and pressure gauge. 
 Very stoutly built for heavy work. 
 
 Capacity of metal pan, liters 7 
 
 Dut) Free 95.70 
 
 Duty Paid 145.00 
 
 Porcelain Dishes to fit inside of copper retort of No. 26640. 
 
 Capacity of porcelain dish, liters 5 
 
 To fit retort, liters 7 
 
 Duty Free 
 Duty Paid 
 
 Note — Pure nickel dishes can also be fitted inside of thu 
 
 |ipcr rcturt. I'ri 
 
 9.10 
 
 16.50 
 
 _■ on application. 
 
 12 
 108.90 
 165.00 
 
 9 
 
 12_ 
 
 12.90 
 
No. 3e(i4S-rortwolrays 
 
 Drying Apparatus, Hearson, for serums and other sensitive imd easily deeomposed liquids. This ap- 
 paratus works without vacuum and renders possible the rapid, safe and antiseptic drying of the 
 most delicate liquids at a low temperature. Two liters of serum can be dried in from six to 
 eight hours which, with a large vacuum apparatus as formerly used, required at least 24 hours. 
 The intake of air is filtered through a flannel filter and, after passing through the heating chamber, 
 reaches the drying compartment in which are placed the trays containing the liquid to be dried. 
 The warm air, after having become charged with moisture from the contents of the trays, passes 
 out of the apparatus. Baffle plates insure the direct passage of the current of air over the trays. 
 For most work a temperature of 25 to 30" C. is Tuaintained in the warming chamber, temperature 
 of which may be noted by reading the thermometer. The apparatus is provided for either gas 
 or electric heating as may be specified but for most work we recommend that electric heating 
 be used both for heating the chamber and operating the motor by means of a resistance on the 
 same circuit which makes it impossible for the heating or the motor to operate alone. The fol- 
 lowing experiment shows the antiseptic conditions under which work may be done with this 
 apparatus:— 
 
 Two liters of running water 1 ce were set. It grew 25 colonies of which the larger part was 
 washed away. The running water was then divided into the four receptacles of the marhine 
 so that 500 ec was in each division. The air ventilator was operated for five hours and the inuoing 
 air warmed with the following result:— 
 
 No, 1 Compartment — Water loss 180 grains— 1 dead cc'onj' in 1 cc 
 
 No. 2 " — 128 grains water evaporated — 9 larcr '!i v! '■iinnii ■ n 1 '■! 
 
 No. 3 " — leegrainswaterevaporated— 21arai' .!.■ ■. :' '. i "n 1 ot. 
 
 Nq, i " — 123 grains water evaporated— 7 la^i' .. ! ■ in 1 re. 
 
 From this experiment it is evident that the germ i...... i .:.■ ...ir l>y the drying process 
 
 has not been increased but considerably decreaaeu. Jn aiiuinn M-st, sterilized water was 
 used and the air admitted was not warmed. In each compartment 2.5U cc of sterilized water dried 
 for five hours, after which 1 cc of each tray was tested. All four tests remained free from germs. 
 
 Number of trays __2 3 ^_ 
 
 Duty Free 172.50 195.00 225.00 
 
 Duty Paid 258.75 292.50 337.50 
 
 
 // , ^ 
 
 . 2l)GbO 
 
 1 
 1 
 
 1 
 
 
 ^ 
 
 
 
 No. 2GGe4 
 
 No. 26652 No lib^U 
 
 26652. Drying Tubes. Liebig -30 
 
 26656. " " Vanier, for zinc, being "E" of the Vanier Combustion Train p. 150 75 
 
 26660. " " " " sulphuric acid, being "F" of the Vanier Combustion Train p. 150 1.25 
 
 26664. " " " Combined Potash Bulb and Drying Tube, being "G" of the Vanier Combustion 
 Train p. 150. 3.25 
 
2i>6fi8. Drying Apparatus. Faust-Heim, designed especially for serums and easily decomposed fluids. As 
 furnished by us to leading maaufaeturers of biological products, Henry Phipps Institute of 
 the University of Pennsylvania, etc. Illustration shows form as made for two dishes. The 
 two larger sizes accommodate three and four dishes, respectively. For gas heating. 
 
 To take, dishes _ 2 _Z 4_ 
 
 Duty Free T96.00 
 
 Duty Paid 237.60 
 
 26672. Drying Apparatus Faust-Heim, same as above but for electric heating. Price 
 
 I Voltafje must be stated in ordering. 
 
 To take, dishes 2 
 
 Duty Free 208.7.5 
 
 Duty'Paid 25.3.00 
 
 216.00 245.00 
 
 261.80 297.00 
 
 ncludes electric motor. 
 
 26()7(i. Drjing Apparatus, Buxton and Beebe. modified by Taylor, for the rapid dry- 
 ing, at low temperatures, of easily decomposed organic products. Of 
 heavy polished copper with motor and burner for heating which is not ir. ' 
 shown in illustration. Price does not include dish. Voltage must be _ 
 stated in ordering 85.00 ~ 
 
 26680. Drying Closet, of glass throughout, with nickel plated brass mountings. Inside ==^^^ -^^^ 
 dimensions 10 x 12 x 10 inches. No 26B88 
 
 Duty Free 19.20 Stock 28.80 
 
 26684. Drying Closet, same as No. 26680 but with two compartments and two handles. 
 
 Duty Free 32.00 Stock 48.00 
 
 26688. Ebulliometer, Dujardin-Salleron, original French make, in exact accordance with the official stand- 
 
 ard of the Arts and Trades Conservatory in Paris, reading in degrees of legal alcoholometer scale 
 and the degrees of Malligand Ebullioscope. Of polished copper with jacket around the burner, 
 complete in case with accessories and thermometer 30.00 
 
 26689. Special Thermometer, for above 10.00 
 
ELECTRO-CHEMISTRY APPARATUS 
 
 Storage Batteries Are Listed On Page <>(i 
 
 Switch Board lor the Demonstration of Ohm's Law. liy nio;iiis <<\ 
 roniicftud with u]3en connections, the opcnition of Ohm 
 [Kiriilivciy large class, C, E ami R being easily legible froii 
 
 ass, C, E 
 X (50 cm. 
 
 Duty Free 49.50 Duty Paid 
 
 Apparatus for the Demonstration of Faraday's Law ^m i rm iln ili 1 1 i iuinii ini 
 
 showing in a verj' instructive manner llir -i i. i ■ ■ ■ ' ■■■■ - 
 
 salts, such as copper from copper sulplj.i- . . , !■ ii , 
 
 time the equivalent deposits of the differeiil uKiai^ ';. uIj lIj^ -..uin' nn i n 
 sists of two (or more if necessary) balances of the fapecihc gravit\- !>pc 
 scale and, suspended from one arm, the platinum cathode in the r'lectn 
 of the metal to be deposited upon the cathode is usually used and elect 
 a current of from .1 to .2 amperes. The illustration shows two 
 
 imclcr, voltnietci' aiut resistance 
 
 can be demonstrated to a com- 
 
 the three scales, in am]5eres, volts and 
 
 "i"l. 
 
 
 ... 59.40 
 
 weights, 
 - uf their 
 
 lie same 
 iitus r 
 
 nd 
 
 ..< anode a ]ilate 
 
 ■stablished with 
 
 set u]) ill connection 
 
 26708. 
 _'«712. 
 
 26716. 
 
 with ammeter, rheostat and battery. Price include; 
 
 cell. See Zeitschriftfur den pkysikalischen iind elicmia 
 
 rhril'l fur Eleklrochemie XVII 1, page 45. 
 
 Duty JFree 10.00 
 
 Electrodes for above of Silver 
 
 Duty Free, when ordered with apparatus... , 1.25 
 
 Duty Paid " " " " ... 1.45 
 
 Switch Board, Experimental, small universal, for currents up to G amperes and under 40 volts. With 
 cision volt-ammeter reading to to 40 volts and from 0-4 amperes; regulating resistance, etc. 
 
 ilv the balances, set of riders and glaf 
 ■,rheh I'lilci-richI XX V 4, page 270 and Zeits- 
 
 Duty Paid 12.00 
 
 Copper Nickel Tin Bismuth _ 
 
 M ^ .85 1.05 ~ 
 
 .50 .65 1.00 1.25 
 
 Duty Free,. 
 Switch Board for Electrolytic Anah>i^ 
 
 ui'ement of currents IVom fl i n .'i 
 1 to electrolyses. The inirr 
 circuit. 
 
 Number of electrolyses 
 
 Total current in amperes 
 
 Voltage 
 
 Duty Free 
 
 Duty Paid 
 
 28.50 
 
 Dufv Paid 
 
 34.20 
 
 ization and meas- 
 n?ctions fo rfrom 
 ii lior low voltage 
 
 4 
 
 89.11) 
 107.00 
 
 For 
 For 
 
 lirect connection of above witli 110 volts, extra per electrolysis, 
 lirect connection of above with 220 volts, extra per electrolysis,. 
 
 30 
 
 1_2 
 
 130.50 
 
 1.56.60 
 
 ul> Paid 
 
 5.00 
 
No. 26720 for D. C. No. 2(i-2S for A. C. ,, . . N»- 2S73G 
 
 Switch Board. Experimental, Model C, for 110 volts direct current, with precision miih-ammeter and 
 voltmeter. Net weight SO kilogran:is; size 83 x 70 x 30 cm. 
 
 Range of meters from 1 milli-ampere to, amperes ■ l'-" 
 
 Duty Free JIJ-^^ 
 
 Duty Paid 132.75 
 
 Switch Board. Experimental, Model C, aw above, but for :220 volts, direct current. 
 
 Range oi meters from 1 milii-amjjere to, amperes 1^ 
 
 Duty Free 120.00 
 
 Duty Paid 1*4.00 
 
 Switch Board. Experimental. Model C. as above, but for 110 volts alternating current. 
 
 Range of meters from 1 milli-ampere to, luuijcres 15 
 
 Duty Free 108.75 
 
 Duty Paid 130-50 
 
 Switch Board. Experimental. Model C, as above, but for 2-JO volts, alternating current. 
 
 Range of meters from 1 milli-ampere to, amperes 15 
 
 Duty Free 118.15 
 
 Duty Paid l*l-'5 
 
 Switch Board. Portable, for Quantitative Electrolysis, particularly recommended for teaching purposes 
 because all connections are exposed, and not recommended for factory or continuous laboratory 
 work because of the deterioration in connections due to this exposure. On heavy hardwood 
 board arranged to either hang on the wall or stand on the work table. _ With precision volt- 
 meter and ammeter reading from to 10 volts and to 10 amperes, respectively. 
 Duty Free 52.50 Duty Paid 63.00 
 
 20 
 
 30 
 
 112.30 
 1!13.00 
 
 118.15 
 141.75 
 
 20 
 
 30 
 
 123.75 
 148.50 
 
 129.50 
 155.15 
 
 20 
 
 30 
 
 110.75 
 132.75 
 
 116.25 
 139.50 
 
 20 
 
 30 
 
 121.90 
 14S.25 
 
 127.50 
 153.00 
 
 No. 26740 No. 26748 
 
 2K740. Switch Board, Portable, for Quantitative Electrolysis, similar to No, 2G736 but with handles for convenient 
 carrying and particularly recommended for factory and practical laboratory work because of the 
 complete protection against dust and fumes and of the fact that the necessary accumulators may 
 be conveniently placed inside the desk shaped cover. With precision voltmeter and ammeter 
 reading from to 10 volts and to 10 amperes, respectively. With adjustable resistance, all 
 necessary connections, etc., but without accumulators 
 Duty Free 70.00 Duty Paid 82.80 
 
 267J8. Switch Board and Work Table, Classen, for Quantitative Electrolysis, with precision voltmeter reading 
 from to 1.5 volts in 0.2 volts and precision ammeter reading from to 15 amperes in 0.2 amperes, 
 and, in addition, both current and potential indicators with all necessary connections, resistances, 
 etc., and connections for laboratory supply of gas, water and vacuum systems Without accumu- 
 lators. Number of determinations 2 4 fi 
 
 Duty Free 211.25 330.00" 440.00 
 
 Duty Paid 256.00 400.00 532.00 
 
ARTHUR H. THOMAS COMPANY 
 
 30 __40 
 
 135.00 231.00 254.10 
 162.00 277.25 305.00 
 
 Switch Board and Work Table for Quantitative Electrolytic Analysis, for operation with direct current 
 up to 5 amperes per electrolysis and at a voltage of 12 volts. Tables are stoutly made of well 
 finished wood, with resistance, measuring instruments, switch, etc., on the upright switch board 
 behind each table. 
 
 Number of electrolyses 2 3 
 
 Amperes, direct current 10 15 
 
 Duty Free lOOToO ~i22;i'5 
 
 Duty Paid 130.75 146.50 
 
 Switch Board, Veit, for Quantitative Electrolytic Analysis, with two gold plated rotating spindles, the 
 polarity of which is reversible by means of switch; each spindle connected with six point switch, 
 advancing the current from .05 amperes to .5 amperes, and additional switch from 1 ampere 
 to 5 amperes. Ammeter reads from .05 to 5 amperes, with connections so that readings may 
 be taken sejiarately from either spindle. The container support will hold a platinum dish up 
 to 3J inches in diameter, with platinum contact points to insure good metallic contact when diah 
 is used as either anode or cathode. Complete outfit is mounted on polished slate slab 31 x_18 
 inches supported by angle-iron braces. This switch board obviously can not be connected with 
 an alternating current unless same is transformed by use of motor generator set 100.00 
 
 Switch Board, same as above but with two revolving spindles 150.00 
 
 Electrolytic Outtil, Herman, for Quantitative 
 Copper Analysis, etc., with revolving 
 anodes and cathode of platinum 
 gauze. Assays are quickly made. 
 Cabinets are made up of any number 
 of units, each unit having an indi- 
 vidual motor so that one or more 
 units may be operated at one time. 
 Can not be used on alternating cur- 
 rent excepting with motor generator 
 set. The outfit Is neatly mounted in 
 a hardwood case with a glass door, 
 which protects the motors from the 
 nitric acid fumes. Complete in cabi- 
 net with voltmeter and ammeter. 
 Platinum electrodes are furnished at 
 the market price of platinum. Ap- 
 proximate weight of anodes, 4.25 
 grams, cathodes, 9.00 grams. 
 
 Number of units 1 2 
 
 Each 100.00 120.00 
 
 Number of units. ... 4 6 
 
 Each 165^00" 220.00 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 2i;7i* Nj 
 
 Switch Board, Nissenson, for Quanlitative Eleclrolysis. closet, form. Cabinet is made of polished oak 
 with three counterpoised ghis,^ iln.,rs (in the outlit for H determinations) and two shelves covered 
 with glass plates; each coi(ip;irniient is fnrnislnvi with precision ammeter and voltmeter, neces- 
 sary control switches, resistaiuvs, etc. AVithoiLl accnuuilators. 
 
 Number of determinations 6 s 10 
 
 Duty Free 528.00 (>(i0.00 792700 
 
 Duty Paid... 640.00 SOO.OO 960.00 
 
 Electrolytic Support. Pischer, Inr u^c \mI1i anv nl i he s\mI fh-l.nards or work table outfits previously 
 
 listed. \\"illi irn' .■III. I I'lrTinnlr. holdi r U>r all kinds of electrodes and stirring devices, with 
 
 i-egiilatiiiLi- rlirn.-,rat in i lie l>:i... Cnnvni, volts... 110 d. c. a. c. and 220 d. c. 
 
 Duly Fret- . 4(i.2.5 ,>l.2.5 " ~ 
 
 Dut> Paid .IG.OO 62^00 
 
 26780. 
 26784. 
 
 26788. 
 26792. 
 
 No. 21 
 Ele. 
 
 FJec 
 
 Elec 
 Ele. 
 
 No. 2I.7>. 
 
 Irolyfic .Suppor(, Fischer, .-^ir 
 
 Duty Free 
 
 Duty Paid 
 troljlic Support. Fischer-Fi 
 
 No 21.7^ 
 il'Jl2model. Current, 
 
 UOd.c. 
 30.00 
 
 No. 2G792 
 
 a. c. and 220d. c. 
 34.65 
 36.00 42.00 
 
 ;enius. for electrolysis without rotation as in elementary electro- 
 
 trode holders and thermometer holder 5.00 
 
 troiytic Support, with .iai>;uincd iron base, glass upright with ring with three platinum lugs and 
 
 one ciamj), and binding post attached to both ring and clamp , 5.00 
 
 troiytic Support, same as No. 26784 with two clamps with binding posts 4.75 
 
 " " w'ith glass upright carrying clamp and separate glass upright carrying ring. . 5.00 
 
 , ith . 
 
r 
 
 1 
 
 T 
 
 1 
 
 r 
 
 L 
 
 J 
 
 ^1 - 
 
 
 
 
 
 No. 26SHi No. 26800 wilh 2SGli; 
 
 Electrolytic Support, Peters, adjustable as to heigliL and with extension clamp. 
 
 Duty Free 6.00 Duty Paid 11.00 
 
 Glass Stirrer, for Electrolysis. Fischer. Illustration of No. 26772 shows the stirrer attached to the 
 rotating head of the support and in connection with the double net electrode 1.50 
 
 Connecting Cords for electrolytic support, covered with red and blue silk, respectively, to show 
 polarity, 80 cm long, per pair 1.50 
 
 Double Net Electrode.Pure Nickel, Fischer 10-00 
 
 Note:— For Platinum Electrodes see Platinum Ware. 
 
 Electric Stirrer and Rotating Anode Apparatus, consisting of motor which can be furnished for either 
 alternating or direct current, 110 or 320 volts: adjustable arm for holding the anode or stirring 
 rod with suitable attachment for electrolysis current and rheostat for regulating speed from 50 
 to 1000 revolutions per minute. Recommended for depositing metals in quantitative analysis. 
 Price does not include crucible anode or dish shown in illustration, nor eiectrolytic stand with 
 glass upright. Please specify voltage and riirrnnt in orderinii 2.^.00 
 
 26824. 
 2G832. 
 
 No. 26824 No. 2bK32 
 
 Speed Counter, Fischer, for conveniently determining the speed of the stirring device 7.00 
 
 '< Potentiometer (Compensation Apparatus), Fischer; a quick and convenient measurement and check of 
 cathode potentials when determining and separating metals by means of electrolysis. The instru- 
 ment consists of a rectangular walnut case with a convenient and handy arrangement of the 
 following :^ — 
 
 A moving coil voltmeter for 0-2.5 volts with divisions of 0.05 volts; a movmg coil galvanometer 
 with pointer and scale divided 10-0-10, sensitiveness 1° = 0.000004 amperes; a current switch for the 
 auxiliary battery; a key; a sliding resistance and four terminals with suitable connections for 
 battery and electrolvsis. The sliding resistance is readily removable for cleaning. See A. Fischer, 
 Eleklroanalytische Schnellmethoden . Enke, Stuttgart 190S and -4. Fischer, Chemilxer-Zeitung Colhcn 
 1.909, No. 37, V. 3S7. 
 Duty Free S.'^.SO Duty Paid 66.60 
 
ARTHUR H. THOMAS COMPANY 
 
 268.56. Apparatus for Rapid Eiectroljais in a Magnetic Field, consisting of a solenoid of insulated copper wire, 
 inside of which is an iron cylinder to strengthen the magnetic field, the entire being covered by 
 an iron mantle which serves to protect the winding and, at the same time, concentrate the lines 
 of force. Connections are provided permitting the use of the same circuit for exciting the sole- 
 noid and conducting the electrolysis. The apparatus is intended for a 16 volt direct current 
 circuit but may be conveniently used on regular lighting circuits of HO or 220 volts direct cur- 
 rent with additional resistances. Without electrodes 21.00 
 
 GALVANOMETERS, DEMONSTRATION, designed primarily for lecture table use, with transparent scale 
 graduated on both front and rear so that same is visible to the audience as well as to operator. With 
 case and base of polished mahogany, with glass both front and back. These instruments are conven- 
 ient for use as Galvanoscopes, i. e., for the indication of the presence and polarity of electric currents, 
 or as Galvanometers as the angle of deflection is proportional to the strength of the current. They 
 are made in two systems, i, e., the electromagnetic or soft iron system with air damping device, and 
 the moving coil or Deprez d'Arsonval system. With the set of resistances and shunts they can be 
 used as volt and ammeters reading from to 250 volts and from to 50 amperes and, in addition, they 
 are offered below in both systems with special scales graduated in both volts and amperes. 
 
 26840. Galvanometer, Demonstration, with soft iron (electromagnetic) system, as 
 above described 
 
 26844. Galvanometer, Demonstration, with moving coil {Deprez d'Arsonval) system, 
 as above described 
 
 26848. Set of Four Resistances and Three Shunts on Baseboard, for use with above 
 Galvanometers, Can be connected singly with the instruments for 
 measuring voltage from to 1, to 10, to 100 and to 250 volts and 
 current from to 1, to 10 and to -50 amperes 
 
 Duty Free 
 13.50 
 
 DEMONSTRATION VOLT AND AMPERE-METERS. These consist of the above Galvai 
 scales reading directly in volts and amperes as indicated. 
 
 26852. Demonstration Ampere-Meter, with soft iron (electromagnetic) system, for 
 either direct or alternating current, 1 to 60 amperes 
 
 268.56. Demonstration Voltmeter, as above, 4 to 100 volts 
 
 26860. " " " " 100 to 250 volts 
 
 26864. '■ Combined Volt and Ampere-Meter, as above, with scale to 
 12 volts and to 6 amperes 
 
 Note: — Please state in ordering whether instrument is to be used on 
 direct or alternating current. 
 
 26868. Demonstration Ampere-Meter, with moving coil (Deprez d'Arsonval) system, 
 for direct current only, to 50 amperes 
 
 26872. Demonstration Voltmeter, as above, to 500 volts 
 
 26876. Demonstration Universal Galvanometer, scale 2-0-2 milliamperes. 100-0-100 
 millivolts, with resistances by which the range is increased to 10 milli- 
 ariipcrcs, 100 ohms and 1 volt 
 
 26880. Separate Shunts, for above, from 100 miUivoIts to 50 amperes, each 
 
 meters wit 
 
 h special 
 
 15.00 
 
 IS.flO 
 
 15.00 
 
 18.00 
 
 18.00 
 
 21.60 
 
 16.50 
 
 19.80 
 
 16.50 
 
 19.80 
 
 21.00 
 
 25.20 
 
 3.60 
 
 4..1.5 
 
ioi%iny Various Sea 
 
 26908 to 2G94(J Showinij \ 
 
 26896. Oalvanoscope, for Wheatstoiie Bridge measurements, determination uf E. M. F. by means of tfie com- 
 pensation method, etc., internal resistance 6 ohms, sensibility .02 milliampere = 1° of scale; 
 diameter 100 mm, height 50 mm 8.25 
 
 26900. Galvanoscope, Paschen, with internal resistance of 10 ohms, sensibilit> of .002 milli-ampere = 1" of 
 scale, and with an internal resistance of 6 ohms and a sensibility of .0002 milliampere = 1° of 
 scale. In an iron case for magnetic protection. Sensibilitv must be specified in ordering. 
 Duty Free 12.75 Duty Paid 15.30 
 
 26904. Galvanoscope, as above, in brass case. 
 
 Duty Free 16.35 
 
 Duty Paid 19.65 
 
 WESTON MINIATURE PRECISION DIRECT CURRENT AMMETERS, VOLTMETERS AND VOLT- 
 AMMETERS, Model 280. These instruments embody all the well known advantages of the Weston 
 instruments being absolutely dead beat and extremely sensitive and so designed that they may be 
 left continuously in circuit under full load without overheating or causing an appreciable change in 
 the indications. The separate voltmeters have a resistance of about 100 ohms per volt while the volt- 
 ammeters have a resistance of approximately 50 ohms per volt. The cases are made of sheet steel 
 finished in dead black and the dimensions are 4.6 x 4.4 x 1.5 inches and any of the instruments may 
 be carried in an ordinary coat pocket. A great variety of ranges is offered, i. e., the voltmeters from 
 50 milli-volts to 150 volts, and the ammeters from 50 milU-araperes to 30 amperes. They are admirably 
 adapted to all kinds of commercial and experimental testing falling within their limits of e. ra. f. and 
 current and are very adaptable for individual students use in laboratory work. Particular attention 
 is called to the double and triple scale instruments and the volt-arameters. The triple range volt- 
 ammeter is in reality si.x instruments in one case, since there are three current ranges and three e. m, f. 
 ranges. Range must be specified in ordering. 
 
 26908. Single Range Milli-Voltmeters. 
 
 Milli-volts 50 75 100 120 150 200 
 
 Bach 
 
 
 . 12.50 
 
 250 
 
 12.50 
 
 300 
 
 12.50 
 
 400 
 
 12.50 
 
 5 
 
 12.50 
 
 ,500 
 
 12.50 
 
 7.5 
 
 12..50 
 
 600 
 
 i2:.50 
 
 10 
 
 12..50 
 
 750 
 
 Each 
 
 Single Range Voltmeters. 
 
 Volts 
 
 1 
 
 . 12.50 
 2 
 
 12.50 
 3 
 
 12.50 
 
 15 
 
 Each 
 
 VoUb 
 
 12.50 
 
 25 
 
 12.50 
 
 40 
 
 12.50 
 .50 
 
 12.50 
 
 75 
 
 12.50 
 
 100 
 
 12.50 
 
 120 
 
 12.50 
 
 150 
 
 Each 
 
 Double Range Voltmeters. 
 
 Volts . 20-2 20-8 
 
 12.50 
 2.5-2.5 
 
 12.50 
 30-3 
 
 12.50 
 ,50-2,5 
 
 12.,50 
 
 ,50-5 
 
 12.50 
 
 SO- 8 
 
 12..50 
 100-10 
 
 12.50 
 
 150-15 
 
 Each.. 14..50 14.50 
 Triple Range Voltmeters. 
 
 Volts 
 
 14.50 
 
 25-10-2 5 
 
 14.50 
 
 30-3-1 5 
 
 14..50 
 30-(i-3 
 
 14.50 14.50 
 30-15-3 
 
 14.50 
 40-20-4 
 
 14.50 
 
 50-5-2.5 
 
 Each 
 
 Volts 
 
 16.50 
 
 50-25-5 
 
 16.50 
 
 50-25-10 
 
 16.50 
 
 ,S0-20-4 
 
 16..50 16.50 
 
 100-25-2 5 1.50-15-1,6 
 
 16.50 
 
 1,50-1,5-3 
 
Single Range Mil-Amnieters. 
 
 Milli-ampcroM ^50 
 
 Each 12.50 
 
 Milli-amperes 250 
 
 Each 12.50 
 
 Single Range Ammeters, 
 
 Ampeics 1 'S '■.'■ 
 
 Each 12.50 12..50 12.50 
 
 Double Range Ammeters. 
 
 Amperes. . . 10 1 2.5-0.25 5-0.1 5-0.5 
 
 Each 13..'>0 13.50 13.50" 13.50 ] 
 
 Triple Range Ammeters, 
 
 Amperes 5-2.5-0.25 10-1-0.1 10-10.5 
 
 Each 16.50 16.50 16.50 
 
 .Impercs 25-2.5-0.5 25-.S-2.5 25-10^.5 
 
 Each 16 50 16 50 16 50 
 
 Single Range \olt-Ammeleri 
 Volts 
 Ampeir 
 Each 
 
 73 
 
 100 
 
 120 1.50 
 
 200 
 
 12.50 
 
 300 
 
 12.50 
 
 400 
 
 12.50 12.50 
 
 ,500 600 
 
 12.50 
 
 760 
 
 12.50 
 
 12.,50 
 
 12.50 12.50 
 
 12.50 
 
 .J 
 
 7 5 
 
 HI 13 25 
 
 30 
 
 12.50 l: 
 
 >.30 12 
 
 .50 12.50 12.50 
 
 12.50 
 
 S-2 10-1 
 
 15-13 
 
 20-2 25-2 5 25-5 
 
 30-3 
 
 13.50 13.50 
 
 1 13.50 
 
 13.50 13.50 13.50 
 
 13.50 
 
 10-1-0.5 
 
 10-2. 5-1 
 
 15-3-0.15 20-4-2 
 
 20-8-2 
 
 16.50 
 
 2.5-10-5 
 
 16.50 
 
 30-3-1.5 
 
 16.50 16.50 16.50 
 
 30-6-3 30-15-3 15-3-1.5 
 
 16 50 
 
 16.,50 
 
 16.50 16.50 
 
 16.50 
 
 
 1.5 
 
 3 
 
 19.00 
 
 3 3 
 1 5 3 
 
 3 
 15 
 
 
 19.00 19.00 
 
 19.00 
 
 WESTON STANDARD PORTABLE DIRECT CURRENT VOLTMETERS AND AMMETERS, The illustra- 
 tion used shows the Kcneral tj-pc of the instruments ami form of mounting, etc., for all of the 
 \oltini-ters, Ammeters, Alil-Animeters and Rlilli-Voltmeters listed below. 
 
 26944. Portable Voltmelers. 
 
 Kange, volts 1.50 1-50 150-5 150-3 150-15 300-150 300 450 600 
 
 Division volts 1 1 1-J„ 1--,',, 1-,',, 2-1 2 .3 5 
 
 Each 55.00 .57.-50 75.00 75.00 75.00 77 ..50 65.00 65.00 65.00 
 
 26948. Portable Milli- Voltmeters. 10 to to 10 and to 20 and 
 
 Ran^e, milli-volta ti. 20 10 to to 10 100 to to 100 to ''00 
 
 Divisions 100 100 100 100 
 
 Each ,50,00 .'>0.00 55.00 55 00 
 
 269.52. Portable Mil-Ammeters. 
 
 Hanjre, mil-amijcrcs. , . 150 300 GOO 1000 1500 500 and 50 500 and 10 
 
 Divisions, rail-amperes 12-1 10 10 5-i 5— ,';, 
 
 Each 50.00 50.00 .50,00 50.00 -50.0(1 60.00 "60,00 
 
 2C956. Portable Ammeters. 
 
 Range, amperes 5 15 25 50 100 
 
 Division, amperes ^',i ,\, \ i \ 
 
 Each. 65.00 65.00" ~~65.00 GSloO 70^ 
 
ARTHUR H. THOMAS COMPANY 
 
 I 
 
 Slate liheostal. Type F 
 
 Rheostats, Ruhstrat, Simple Form of Sliite, Type F, 
 
 prismatic contact. 
 
 Univeraal Hheustat. Type U 
 iluniinurn feet, with liolcs for screwing to table, am.! 
 
 No. 
 
 Amperes 
 
 Ohms 
 
 Size, mm 
 
 Duly 
 Free 
 
 Duly 
 Paid 
 
 No. 
 
 Amperes 1 
 
 thrns 
 
 8i,e.mm 
 
 Duly 
 Free 
 
 Duly 
 Paid 
 
 26960. 
 
 O.o 
 
 250 
 
 120 X 30 X 15 
 
 3.15 
 
 3.80 
 
 27040. 
 
 4.0 
 
 iO 
 
 430 X IjO X 35 
 
 9.40 
 
 1130 
 
 26964. 
 
 
 400 
 
 160 X 40 X 15 
 
 3.75 
 
 4.50 
 
 27044. 
 
 7.0 
 
 1.7 
 
 120 X 30 X 15 
 
 3.23 
 
 3.90 
 
 26968. 
 
 
 650 
 
 200 X 50 X 20 
 
 5.45 
 
 6.55 
 
 27048. 
 
 
 :} 
 
 160 X 40 X 15 
 
 3.80 
 
 4.55 
 
 26972. 
 
 
 1200 
 
 300 X 50 X 25 
 
 6.10 
 
 7.25 
 
 27052. 
 
 
 5 
 
 200 X 50 X 20 
 
 5.70 
 
 6.85 
 
 26976. 
 
 
 1700 
 
 400 X 50 X 25 
 
 8.20 
 
 9.80 
 
 27056. 
 
 
 8 
 
 300 X 50 X 25 
 
 6.75 
 
 8.00 
 
 26980. 
 
 
 2400 
 
 450 X 60 X 35 
 
 9.40 
 
 11.30 
 
 27060. 
 
 
 16 
 
 450 X 60 X 33 
 
 9.75 
 
 11.70 
 
 26984. 
 
 
 
 140 
 
 160x40x15 
 
 3.75 
 
 4.50 
 
 27064. 
 
 10 
 
 ,85 
 
 120 X 30 X 13 
 
 3.40 
 
 4.05 
 
 26988. 
 
 10 
 
 55 
 
 120 X 30 X 15 
 
 3.15 
 
 3.80 
 
 27068. 
 
 
 1.5 
 
 160 X 40 X 15 
 
 3.90 
 
 4.70 
 
 26992. 
 
 
 150 
 
 200 X 50 X 20 
 
 5.45 
 
 6.55 
 
 27072. 
 
 
 2,5 
 
 200 X 50 X 20 
 
 6.00 
 
 7.20 
 
 26996. 
 
 
 300 
 
 300 X 50 X 25 
 
 6.10 
 
 7.25 
 
 27076. 
 
 
 4 
 
 300 X 50 X 25 
 
 7.05 
 
 8.45 
 
 27000. 
 
 
 440 
 
 400 X 50 X 25 
 
 8.20 
 
 9.80 
 
 27080. 
 
 
 6 
 
 400 X 50 X 25 
 
 9.10 
 
 10.90 
 
 27004. 
 
 
 550 
 
 450 X 60 X 35 
 
 9.40 
 
 11.30 
 
 27084. 
 
 
 8,3 
 
 450 X 00 X 35 
 
 10.15 
 
 12.20 
 
 27008. 
 
 2 
 
 14 
 
 120 X 30 X 15 
 
 3.15 
 
 3.80 
 
 27088. 
 
 15 
 
 3 
 
 400 X 50 X 25 
 
 9.10 
 
 10.90 
 
 27012. 
 
 
 24 
 
 160 X 40 X 15 
 
 3.75 
 
 4.50 
 
 27092. 
 
 20 
 
 2,4 
 
 120 X 30 X 15 
 
 3.40 
 
 4.03 
 
 270L6. 
 
 " 
 
 35 
 
 200 X 50 X 20 
 
 5.45 
 
 6.55 
 
 27096. 
 
 
 0,4 
 
 160x40x15 
 
 3.90 
 
 4.70 
 
 27020. 
 
 
 70 
 
 300 X 50 X 25 
 
 6.10 
 
 7.25 
 
 27100. 
 
 
 3 
 
 200 X 30 X 20 
 
 6.00 
 
 7.20 
 
 27024. 
 
 
 105 
 
 400 X 50 X 25 
 
 8.20 
 
 9.80 
 
 27104. 
 
 
 1 
 
 300 X 50 X 25 
 
 7.05 
 
 8.43 
 
 27028. 
 
 
 130 
 
 450 X 60 X 33 
 
 9.40 
 
 11.30 
 
 27108. 
 
 
 1,6 
 
 400 X 50 X 23 
 
 9.10 
 
 10.90 
 
 27032. 
 
 4.0 
 
 6 
 
 120 X 30 X 15 
 
 3.15 
 
 3.80 
 
 27112. 
 
 " 1 
 
 2.5 
 
 430 X CO X 35 
 
 10.15 
 
 12.20 
 
 27036. 
 
 
 10 
 
 160 X 40 X 15 
 
 3.75 
 
 4.50 
 
 
 
 
 
 
 
 
 To prices given above add til 
 
 folloivins foi 
 
 extras art indicated, if desire 
 
 . 
 
 
 
 
 
 
 E^tra for scale wi 
 
 li olim 
 
 Extra for 
 
 BindJne Willi w 
 
 ire 
 
 Exira for Re 
 
 -Ira: cr 
 
 ss 
 
 For 
 
 Rheost 
 
 ats 
 
 30 X 15 
 
 divisions 
 
 
 Of increasing diameter 
 
 Duly Free Duly Paid 
 
 .55 .65 
 
 wind 
 Duly Free 
 
 Duly 
 .9 
 
 
 
 Duty Free 
 .83 
 
 D 
 
 uly Paid 
 1.00 
 
 Paid 
 
 Size, mm 
 
 120 X 
 
 
 
 
 60 X 
 
 40 X 15 
 
 .85 
 
 
 1.00 
 
 .55 
 
 .65 
 
 
 .75 
 
 .90 
 
 
 200 X 
 
 50x20 
 
 .83 
 
 
 1.00 
 
 .55 
 
 .63 
 
 
 1.05 
 
 1.3 
 
 
 
 
 300 X 
 
 50x25 
 
 .85 
 
 
 1.00 
 
 .55 
 
 .65 
 
 
 1.05 
 
 1.30 
 
 
 400 X 
 
 50x25 
 
 .85 
 
 
 1.00 
 
 .83 
 
 1.00 
 
 
 1.50 
 
 1.80 
 
 " 
 
 450 X 
 
 60x35 
 
 .85 
 
 
 1.00 
 
 .85 
 
 1.00 
 
 
 1.50 
 
 1.80 
 
 istats, Ruhstrat, Universal Form of Slate, Type U, consisting 
 almninum feet. The two resistances may be operated 
 being provided with separate contact slide. This form 
 experimental purposes. 
 
 ; of two resistances mounted side by side on 
 independently, in serie.^, or in parallel, each 
 of Rheostat lends itself to a great variety of 
 
 No. 
 
 27116. 
 
 27120. 
 
 27124. 
 
 2712S. 
 271.52. 
 
 2713G. 
 
 27140. 
 27144. 
 
 0.3/ 
 
 200 X ,50 X 20 
 
 11..50 
 
 13.73 
 
 1/ 
 
 300 X 50 X 25 
 
 12.60 
 
 15.00 
 
 13 1 
 1 6( 
 
 400 X 50 X 25 
 
 14.70 
 
 17.65 
 
 2,5) 
 
 450 X 60 X 35 
 
 16.73 
 
 20.00 
 
 65 1 
 
 200 X 50 X 20 
 
 11.23 
 
 13.50 
 
 120 1 
 
 IS,* 
 
 ,300 X 30 X 23 
 
 12.60 
 
 15.00 
 
 1701 
 13/ 
 
 400 X .50 X 25 
 
 14.70 
 
 17.65 
 
 250/ 
 
 430 X 60 X 35 
 
 16.75 
 
 20.00 
 
 I / 150 1 
 
 4/ 6/ 
 
 300 / 
 
 271.36. 
 
 
 440 
 40 
 
 27160. 
 
 
 ,300 
 
 27164. 
 
 0,3 
 
 030 
 
 
 
 65 
 
 27168. 
 
 
 1200 
 120 
 
 27172. 
 
 
 1700 
 170 
 
 27176. 
 
 
 2400 
 250 
 
 200 X 50 X 2(1 
 300 X 50 X 25 
 400 X 30 X 23 
 450 X 60 X 33 
 200 X 50 X 20 
 300 X 50 X 23 
 400 X 50 X 23 
 450 X 00 X 33 
 
 11.00 
 12.00 
 14.33 
 16.00 
 11.00 
 12.00 
 14.35 
 16.00 
 
 Paid 
 
 13.20 
 14.40 
 17.23 
 19.20 
 13.20 
 14.40 
 17.23 
 
To pricts given above add the following for extras as indicated, if desired. 
 
 
 Exlra for scale u 
 
 ith ohm 
 
 Eslra for 
 
 vinding with wire 
 
 l!:ilra for Iluhslrat cross 
 
 Size, mm 
 
 
 diTiaions 
 
 
 of incre 
 
 asine diameter 
 
 
 
 Duty Free 
 
 
 Duly Paid 
 
 Duty free 
 
 Duly Paid 
 
 Dut) Fr.c Duly Paid 
 
 200 X 50 X 20 
 
 .45 
 
 
 .55 
 
 .45 
 
 .55 
 
 .7.3 .90 
 
 300 X 50 X 25 
 
 .45 
 
 
 .55 
 
 .45 
 
 .55 
 
 1.05 1.30 
 
 400 X 60 X 25 
 
 .75 
 
 
 .90 
 
 .75 
 
 .90 
 
 ]..r> 1.65 
 
 450 X 60 X 35 
 
 
 
 .90 
 
 
 .90 
 
 l.fi,-. 2.00 
 
 Tube liheoalal. Tjjie U 
 
 Rheostats. Ruhstrat, Metallif Tttbe Form, Type F, on foot, consisting of thin walled rnetal tubes thoroughly 
 insulated with enamel and wound with resistance wire of a special alloy which is so well insulated by 
 means of a microscopically designed oxide deposited on the surface as to permit the wire to lie in contact. 
 
 No. 
 
 Oiin 
 
 Lenglti.l Diam.. 
 
 Duty Free Duty Paid 
 
 Duly Free } Duly Paid 
 
 27180. 
 27184. 
 27188. 
 27192. 
 27196. 
 27200. 
 27204. 
 27208. 
 27212. 
 27216. 
 27220. 
 27224. 
 27228. 
 27232. 
 27236. 
 27240. 
 27244. 
 27248. 
 27252. 
 27256. 
 27260. 
 27264. 
 272G8. 
 27272. 
 27276. 
 
 700 
 
 1000 
 
 1400 
 
 2300 
 
 2600 
 
 3600 
 
 5500 
 
 150 
 
 225 
 
 270 
 
 450 
 
 500 
 
 710 
 
 1130 
 
 25 
 
 3S 
 
 50 
 
 86 
 
 100 
 
 140 
 
 220 
 
 10 
 
 15 
 
 20 
 
 35 
 
 30 
 30 
 40 
 40 
 50 
 50 
 60 
 30 
 30 
 40 
 
 2.65 
 3.00 
 3.45 
 4.20 
 5.05 
 5.70 
 7.60 
 2.65 
 3.00 
 3.45 
 4.20 
 5.05 
 5.70 
 7.60 
 2.65 
 3.00 
 3.45 
 4.20 
 5.05 
 5.70 
 
 3.00 
 3.45 
 
 4.20 
 
 3.15 
 3.60 
 4.15 
 5.05 
 6.05 
 6.85 
 9.10 
 3.15 
 3.60 
 4.15 
 5.05 
 6.05 
 6.85 
 9.10 
 3.15 
 3.60 
 4.15 
 5.05 
 6.05 
 6.85 
 9.10 
 3.15 
 3.60 
 4.15 
 5.05 
 
 27280. 
 27284. 
 27288. 
 27292. 
 27296. 
 27300. 
 27304. 
 27308. 
 27312. 
 27316. 
 27320. 
 27324. 
 27328. 
 27332. 
 27336. 
 27340. 
 27344. 
 27348. 
 27352. 
 27356. 
 27360. 
 27364. 
 27368. 
 27372. 
 
 11 
 IS 
 20 
 28 
 45 
 
 1 
 
 1.5 
 
 1.8 
 
 3 
 
 3.2 
 
 4.4 
 
 7. 
 
 300 
 400 
 500 
 150 
 200 
 200 
 300 
 300 
 400 
 500 
 150 
 200 
 200 
 300 
 300 
 400 
 600 
 
 0.25 150 
 
 0.4 200 
 
 0.45 200 
 
 0.75 300 
 
 O.S 300 
 
 1,1 400 
 
 1.9 500 
 
 5.70 
 7.60 
 3.00 
 3.30 
 3.75 
 4.65 
 5.25 
 6.10 
 S.OO 
 3.00 
 3.30 
 3.75 
 4.65 
 5.25 
 6.10 
 8.00 
 3.00 
 3.30 
 3.75 
 4.65 
 5.25 
 6.10 
 
 6.85 
 9.10 
 3.50 
 4.00 
 4.50 
 5.60 
 6.30 
 7. .30 
 9.50 
 3.50 
 4.00 
 4.50 
 5.60 
 6.30 
 
 3.50 
 4.00 
 4.50 
 5.60 
 6.30 
 7.30 
 9.50 
 
 a for rotary drive 
 
 160 
 
 200 
 
 200 
 300 
 300 
 400 
 600 
 
 30 
 30 
 40 
 40 
 50 
 50 
 
 Duty Fre 
 .55 
 
 .60 
 .60 
 
 .70 
 
 .85 
 
 .75 
 .75 
 
 1.00 
 
 Duly Free 
 2.05 
 2.10 
 2.25 
 2. .55 
 2.55 
 2.S5 
 3.15 
 
 Duty Paid Duty Free 
 
 3.10 
 3.10 
 3.45 
 3.80 
 
 1.05 
 1.15 
 1.30 
 1.45 
 1.65 
 
 Duty Paid 
 1.00 
 1.10 
 1.30 
 1.35 
 1.50 
 1.75 
 2.00 
 
 Duty Free 
 
 Duty Paid 
 
 .55 
 
 .65 
 
 .55 
 
 .65 
 
 .55 
 
 .65 
 
 .55 
 
 .65 
 
 ..55 
 
 .65 
 
 .55 
 
 .65 
 
 .55 
 
 .65 
 
 Rheostats, Ruh.strat, Universal Metallic Tube Form, Type U, on feet, consisting of two metal tubes as in Tube 
 Forrn Type V, but with two independent rontacts permitting the use of the resistances either sepa- 
 rately in, series, or in parallel. A new and useful form in laboratory work. Price twice those quoted 
 above for Tube Form, Type F. 
 Note — In ordering Rheostats please specify carefully current capacity, resistance, and size desired. 
 
# 
 
 I 
 
 No. 27412 
 27400. 
 27408. 
 27412. 
 
 27416. 
 
 27420. 
 
 27428. 
 27432. 
 27436. 
 
 27452. 
 27456. 
 
 27460. 
 27464. 
 27468. 
 
 
 No. 2743U No. 27424 No 2 440 No > 4la No. 27452 No. 27456 No. 27464 Nu. 274G8 
 
 Emery Cloth, in .sheets 9 x 11 iriLhet. hnc me 1 uri jr coarse. Per dozen sheets 70 
 
 " Paper " " 9 x 11 Per dozen sheets 30 
 
 Eudiometers, Bunsen, with platinum electrodes. Graduated, cc 50 cc in i^ths 100 cc in ^tha 
 
 Each ^2:50 " 3.00 
 
 Eudiometers, Bunsen, graduated in millimeteia. Graduated to ram 30O 500 
 
 Each .^ _ " 2700~ ~2.50 
 
 Eudiometers, Mitscherlich, with glass stopcock and platinum electrodes. 
 
 Graduated, cc 50 cc in ^ths 100 cc in ^ths 
 
 Each " 3.-50 4.25 
 
 Eudiometers, Ure, with platinum electrodes. Graduated, cc 50 cc in 5ths 100 cc in ice 
 
 Each 2.00 ~ 2.50 
 
 Extraction Flask, Knorr, for mercury seal ; capacity 100 ce . .40 
 
 " " " with two holes in the neck to provide for the return flow of ether .50 
 
 Sy, with trough for mercury seal, with large neck to facilitate cleanin] 
 
 20n 
 
 750 
 .37 
 
 250 
 
 250 
 
 1000 
 
 500 
 
 Capacity, cc 100 150 
 
 Each ;■■■■.■ 50 '.65~ 
 
 Flask, Extraction, New Jena Glass, flat bottom with wide neck and vial mouth. 
 
 Capacity- cc 50 100 150 250 500 
 
 Each 12 .13 .14' .19" .29~ 
 
 Flask, Extraction, New Jena Glass, round bottom with wide neck and vial mouth. 
 
 Capacity, cc 50 100 1.50 
 
 Each 12 .13 .14 .19 .29 
 
 Extraction Thimbles Schleicher & Schiill's No. 603; seamless and made from the best material, it is ab- 
 solutely impossible for any particles of the substances undergoiuff extraction to find their wav 
 into the ether. The ether itself flows readily from the shells. 
 Diameter, mm. . . 19 22 26 25 28 30 33 .33 33 43 
 
 Height, mm 90 80 60 80 SO 80 8 9 4 US 123 
 
 Per box of 25 1.65 1.65 1.65 1.85 " 1.60 1.85 i.8"5 2^30 3716^^70 
 
 Extraction Thimbles, Schleicher & Schiill's New Double, exactly same as above but of double thickness. 
 
 Diameter, mm 25 33 43 
 
 Height, mm 80 SO 123 
 
 Per box of 25 3.70 3770 7.40 
 
 Extraction Thimbles, Alundum. For the extraction of soaps, fats, foods, rubber, etc., by both organic 
 and inorganic solvents, these thimbles offer the advantage of being rapid, practically indestruct- 
 ible and readily cleansed bv ignition. 
 
 Diameter, mm ' 32 35 26 25 30 10 34 32 45 
 
 Height, mm 51 55 60 70 80 90 100 127 127 
 
 Each. . 
 
 40 .50 .40 .40 .45 .50 .60 .75 1.00 
 
 Extraction Thimbles, Glass, round bottom, with perforations. Diameter, mm 25 33 43 
 
 Height, mm " SO 80 123 
 
 Each 35 .56~~ .75 
 
 Extraction Tubes, Soxhlet. The sizes of thimbles given are for convenience in ordering only as other thim- 
 
 bles may be used in each extraction tube. 
 
 Capacity to top of syphon, cc 
 
 Height of syphon tube, mm 
 
 Suitable for S, & S. thimbles, mm. . 
 
 Inside diameter, mm 30 
 
 70 100 
 
 90 112 
 
 28^80_ _33xllS 
 
 Each 1.20 1.60 
 
 Extraction Tube, shape as above but of dimensions required by the Southern Cotton Oil Co. 
 
 Extraction Tube, Smalley, for cotton seed oil work 1.30 
 
 Extraction Tube, Lehmann, with ground in top, for the extraction of bulky substances. 4.00 
 
 50 
 
 200 
 
 120 
 
 43x123 
 
 2.30" 
 
 1.20 
 
No. 2TISU No. 
 
 No. 274t»i No. 27508 No. 27512 No. 27516 No 2 oM 4 No 27528 
 
 27491'. 
 
 274%. 
 
 27500. 
 27504. 
 27.^08. 
 
 27524. 
 
 27528. 
 
 Extraction Apparatus, Soxhlet, complete with flask and condeoser. Consisting of buib couileiisei, 
 Soxhlet extraction tube No. 27456, and wide mouth Jena extraction flask fitted with specially 
 selected fine grain cork stoppers. 
 
 Inside diameter of Soxhlet Tube, mm 3U 3S .'>0 
 
 Each 3.25 3.50 4.50 
 
 Extraction Apparatus, Soxhlet, same as No. 27476 but with ground joints instead of cork stoppers. 
 Each apparatus is furnished with three Jena glass flasks ground to fit extraction tube. 
 
 Inside diameter of Soxhlet tube, mm 30 3S 50 
 
 Each 4^50 5.00~ 6.00 
 
 Extraction Apparatus, Soxhlet, same as No. 27480, i. e., with ground joints throughout, but with Hop- 
 kin.? Condenser in place of bulb condenser. With three Jena extraction Flasks ground to fit. 
 
 Inside diameter of Soxhlet tube, mm 30 38 50 
 
 Each "5^6 5^50 6^ 
 
 Extraction Apparatus, consisting of Soxhlet tube 38 ram inside diameter, Hopkins condenser and Knorr 
 flask; 100 cc, for mercury seal. The joint between the condenser and extraction tube is ground 
 
 air-tight 6.00 
 
 Extraction Apparatus, exactly same as No. 274SS but with Sy Flask for mercury seal 6.00 
 
 " " Knorr, complete with condenser, e.xtraction tube with perforated platinum 
 
 disc and Knorr fiask. See U. S. Department of Agriculture, Bureau of Chemistry, Circular No. 69, 
 
 Wilier & Goodrich "Improvements in the Knorr Fat Extraction Apparatus" , 6.50 
 
 Extra Condenser with adapter sealed on 3.60 
 
 " Extraction Tube, with platinum disc 3.0ft 
 
 " Tube, improved form with nickel disc and wire spring 1.20 
 
 Note^If Knorr flasks are desired with two J inch holes in neck for return of flow of ether, an extra 
 
 price of lOii per flask is charged. 
 Extraction Apparatus, Ringer, with Hopkins condenser. An extraction apparatus well suited for 
 continuous extractions from liquid media. The ether as it condenses in the condenser drips 
 down into a central tube which permits of its escape through small openings at its bottom. The 
 ether then, because of its gravity, rises to the surface of the medium to be extracted. This 
 apparatus is well adapted for the extraction of /3-oxybutyric acid from diabetic urine. As used 
 in the Laboratory of Physiological Chemistry, Medical Department, University of Pennsylvania. 
 All joints ground air-tight. Inside diameter of extraction tube 38 mm, length of extraction tube 
 
 37 cm. Complete with three flasks ground to fit , . , 8.00 
 
 Extraction Apparatus, Friedrichs, for continuous liquid extractions. Complete with counter current 
 condenser and three flasks, with all joints ground air-tight. The condensed ether from the 
 condenser drops into the funnel tube of the extractor and reaches the bottom through the screw- 
 cylinder. It then ascends and the new drops enter the liquid to be extracted. When the ether 
 layer reaches the lower tube the excess runs back into the flask and the process goes on. By 
 means of the stopcock funnel and the lower stop-cock, liquid may be introduced or drawn 
 
 olT without interrupting the operation. See Zeiischrift far anal. Chemie, 1911 15.00 
 
 Extraction Apparatus, Teas, as u,sed in tanning laboratories; extractor, flask and reflux condenser are 
 of heavy copper, the flask being of 1 quart capacity. Original form without side tube A. 17.40 
 
 Extraction Apparatus, Teas, as above with side tube A for flooding contents of extraction 18.00 
 
 Extraction Apparatus, Yocum, as used in tanning laboratories. The extractor and flask are of heavy 
 polisiicd copper, the latter of 1 liter capacity. The condenser is of brass ground in 24.00 
 
^. 
 
 ■J^ 
 
 27->44. 
 
 2754S. 
 
 27560. 
 
 27564. 
 
 Extraction Apparatus, Cottle, frequently referred to aa the Underwriter'a Laljuuit jiii.b t jim. .See No- 
 vember Journal of Industrial and Engineering Chemistry, 1912; consisting of a metallic spiral 
 reflux condenser supporting a porcelain Gooch crucible by means of platinum or aluminum wire. 
 Ail contained in a specially desijined, long neck Erlenmeyer flask, the whole apparatus being 
 only 6 inches high and 3 inches wide. Specially reconunended for use in testing rubber com- 
 pounds as used on wires and cords 2.50 
 
 Extraction Apparatus, for Rubber Analysis, as recommended by the Joint Rubber Insulation Committee. 
 See Journal of Industrial and Engineeriruj Chemistry, January, 1914- This apparatus is in 
 general like the preceding form but with a syphon cup for holding the paper extraction thimble 
 instead of a Gooch crucible as used in the Cottle form. In addition, all of the dimensions 
 are slightly different, being in exact accordance with the specifications of the Committee above 
 referred to 2.50 
 
 Extraction Apparatus, as used in the Food Laboratories, Bureau of Chemistry, U, S. Department of 
 Agriculture. Parts arc supplied separately at the prices given or the complete outfit at the 
 total of the three prices. 
 A— Cylinder, 20^ incLf ^ I<>i l^ _' inches in diameter, except at its lower or sealed end, which is 
 
 enlarged to di' 'nhes for a length of 4 inches 1,50 
 
 E — Condenser, Ij intli ■; .;. 'i. m-ulur, except at its upper end which is enlarged to a bulb 2j inches 
 
 in diameter, tu iJeiuuL ils suspension in "A" 1.50 
 
 C — Thimbles, 6 inches long and I5 inches in diameter, perforated i inch from top with two 3 inch 
 holes placed opposite each other, capacity 100 cc, with straight upper rim ,50 
 
 Extraction Apparatus, Reed, as used for bark and wood extracts, etc.; in use in many tanning labora- 
 tories. Of polished copper, with polished condenser. Complete as shown in illustration. . 18.00 
 
 Extraction Apparatus, Thorn, with ground joint condenser. 
 
 Height, mm ISO 210 
 
 Diameter, mm 30 40 
 
 Each 2.40 4.00 
 
 Extraction Apparatus. Wiley, with metallic condenser and top and with porcelain Gooch crucible. 
 \o stoppers are required and the arrangement permits double weighing of both residue and 
 extracted matter 5.00 
 
 Extraction Apparatus, Wiley-Eichardson, a simpie form, recommended where much work is done on 
 fats, oils, gums and resins, combining the simplicity and efficiency of the original Wiley appa- 
 ratus with the maceration and percolation method of washing as in the regular Soxhlet apparatus. 
 Complete with glass syphon cup a.s shown in illustration but without extraction thimbles, . 5.00 
 
 Support and Gas Heating Apparatus for Extraction Apparatus, consisting of extra large support, ring 
 95 mm, clamp, cast iron water bath, 120 mm, without burner or glassware , 2,50 
 
 Support and Electric Heating Apparatus for Extraction Apparatus, consisting of large support, clamp 
 and electric heater for three heats, 115 mm, the latter being set into the base of the support. 
 These supports may be arranged in banks of three, six, twelve, etc., and form a convenient and 
 satisfactory method of conducting extractions as each extractor may be operated at a given heat 
 independently of the others. For either 110 or 220 volts. Voltage must be stated in ordering, 7.00 
 
ARTHUR H. THOMAS COMPANY 
 
 "6 iliii 
 
 Support and Electric Heating Apparatus for Four Extractions, consisting of 4 supports, 4 clamps and 
 electric hot plate, without glassware. A convenient arrangement as the hot plate is not per- 
 manently attached to the bases of the supports and may be used for other work as well, as 
 may also the supports 15.40 
 
 Support and Heating Apparatus for Six Extractions, consisting of rectangular copper water bath, with 
 water level, and special upright supports for six extractors. Can be heated either by gas or run- 
 'ng hot water. Without glassware or burner 24,00 
 
 Support and Electric Heater for Six Extractions, for heating by electric 
 lamps. Box support is made of asbestos wood, with holes over 
 the lamps used for heating. With iron uprights and adjustable 
 metal rods with six clamps each. State voltage in ordering. 
 
 Without glassware 30.00 
 
 Support with Electric Heaters for Six Extractions, similar to above but 
 with electric hot plates with individual switches and support. 
 The base is of sheet iron, 9 inches high, 5^ inches wide and 24 
 
 inches long. State voltage in ordering 55.00 
 
 .384. Revolving Support and Electric Heating Apparatus for Extraction Apparatus with copper condenser. 
 The tank of the condenser is adjustable in height so that extractors of different sizes may be 
 used. The temperature of the hot plate is high enough to volatilize solvents of the highest boil- 
 ing point generally used in fat extractions. Where different temperatures are required small 
 discs of asbestos may be inserted under the flasks. Very economical of space and of current. 
 For eitlier 110 or 220 volts. Voltage must be stated in ordering 35.00 
 
. 2758S Ni 
 
 Nu. 27586 No. 2760U 
 
 27592. 
 27596. 
 
 27(i04. 
 27608. 
 
 27616. 
 27620. 
 
 27624. 
 27628. 
 27632. 
 27636. 
 
 Fermentation Tubes, for bacteriological work, small size; height of vertical tube 100 mm, outside 
 diameter of tube 12 to 13 mm; with loag tabulation for plugging and bulb carefully made to 
 hold entire contents of vertical tube; on glass foot, ungraduated 25 
 
 Fermentation Tube, same size and shape as No. 27588 but without glass foot 15 
 
 " same size and shape as No. 2758S with glass foot and tube graduated in cubic 
 centimeters 50 
 
 Fermentation Tube, American Public Health Association standard. See "Standard Methods for thr 
 Examination of Water and Seioage." Inside diameter of upright tube 15 mm, length of verti- 
 cal tube 140 mm, diameter of bulla 38 mm, on giasa foot 35 
 
 Fermentation Tube, same as No. 27600, but without glass foot 20 
 
 " without bulb, so-called "fish hook" form; height of vertical tube 100 mm, out- 
 side diameter of tube 12 to 13 mm 10 
 
 Fermentation Tube, Smith, without foot, designed primarily fur the cultivation of anaerobes, in exact 
 accordance with the specifications given us by the author; carefully made as to all dimensions 
 and as to the angle between the vertical tube and the bulb ; in appearance similar to No. 27604. .30 
 
 Fermentation Tube Support, of copper; for 10 tubes without foot, of the usual size 
 Figures, of steel, for stamping steel, iron, bullion, etc. In sets of 9. 
 
 Face, inches s 
 
 Per set of nine 1.00 
 
 Files, fiat, best quality. Length, inches o 4 
 
 Each " 10 .12 
 
 Files, round (Rat tail), best quality. Length, inches 
 
 Each 
 
 Files, triangular, best quality. Length, inches 3 
 
 Each .08 
 
 File Handle, best quality 
 
 .15 
 
 .10 
 
 .15 
 
 .12 
 5 
 
 2.50 
 
 .20 
 
 8 
 
 .12 
 
 27648. 
 27652. 
 27S56. 
 
 No. 2764^ No. 27652 
 
 Filtering Apparatus, Witt, with ground in funnel and ground on glass cover with side tubulation for 
 liltering into beaker, or other receptacle, under diminished pressure. Price does not include 
 beaker. The main body of the jar is 16 cm high by 12 cm in diameter and ground in funnel in 
 
 9 cm in diameter 4.50 
 
 Filter Apparatus, Martin, for filtering toxins or for filling bulbs with sterile liquid by means of a 
 filter or other suction pump. Consisting of Pasteur-Chamberland cylinder in special metal 
 mounting with funnel and stopcock. All parts are demountable, permitting sterilization in the 
 autoclave. Without stand, clamps or glass bulb these being indicated in illustration to show- 
 arrangement only 12.60 
 
 Filter Apparatus, Martin, complete with suitable support and clamps 14.00 
 
 Filter Apparatus, Kitasato, consisting of 1000 ce flask, filter cylinder with bulb and rubber stopper. . 2.50 
 
 Filter .Apparatus, Reichel, improved form, for separating the bacteria in fluid cultures from their 
 
 various products. Complete with special flask of about 150 cc capacity, filter cylinder and 
 
 rubber and asbestos rings 2.75 
 
=^ 
 
 276fi8. 
 -27G72. 
 
 Filter Apparatus, Uhlenhuth and Weidanz, for filter ng se un t f o in i e hate dehver\ into am- 
 poules without exposure. With measuring tube on the side for raea&uriQ), doses up to _ cc. May 
 
 be u^f'l "iHi P-f-Tk^'fi^ld filter and glass mantle a(5 m Jicate J in illu&tiation, but filter cylinder and 
 •j.[:jF~ 'I ■'' 'III rubber stopper are not included in the price. It may also be used with 
 
 .M:ia- I i I I \ii. 27708 by means of asbestos ring and rubber cap 6.00 
 
 Filter Appariuu-.. . -mill II lo above but with Silberschmidt filter held in place by rubber band with 
 asbestos ring, < iraduations on the tube permit the delivery of accurate doses into ampoules by 
 
 means of pinchcock. Price does not include filter cylinder 4.50 
 
 Filter Apparatus, same as 27664 with glass stopcock, but without filter cylinder 6.00 
 
 Filters, Berkefeld, cylinders only with metallic head-pieces. As widely used in all laboratory work 
 ill the filtration of toxines and the preparation of sterile liquids of all sorts. These filters are 
 furnished in three degrees of fineness: — 
 
 "W" = very fine or slow filtering. 
 
 "N" =normal or medium filtering. 
 
 "V" =coarse or rapid filtering. 
 Unless other specifications are given, the "X," or normal, filters are supplied on all or<lers. 
 
 Number 1 2 13 3 5 6 
 
 Size, inrhes 10x2 Sxl 5x1 2.1 x |- Is x | Jxf 
 
 2768S. 
 27692. 
 
 2769G. 
 
 27700. 
 
 27701. 
 
 2770S. 
 
 27712. 
 
 Each 
 Filters, Berkefeld. 
 
 3.50 3.00 2.50 1.25 1.15 1.00 
 
 ve but with glass mantle with circular opening in bottom into which metal 
 
 4.25 3.75 2.00 
 
 ncluded with the cylinder 
 
 1.65_ 
 
 n Xo. 2<67G. 
 
 1..50 
 
 2i \ ; 4| X u 
 ToO .50 
 
 nlated mount with 
 
 head-piece is clamped. 
 
 Number l 
 
 Each 5.25 
 
 Glass Mantles, oiilv, for Berkefeld Filters, such as are 
 
 Number ' 1 2 3 
 
 Size, inches 14 x^ 11 x 2J 4x1 
 
 Each 1.75 " "" 1.25" """ .75"" 
 
 Filters, Berkefeld, Household. Can be screwed to anv ] inrh hiii fnucrf . In niiki.l 
 
 filler .■vlinder 6y x 2f inches ". 4.00 
 
 Extra Filter Cylinder, only 1.50 
 
 Filter Cylinder, of unglazed porcelain, 200 x 17 mm, outside dimensions. As used in Kitasatos and 
 
 similar filters 20 
 
 Filter Cylinder, Pasteur-Chamberland, Bougie "B," i, e., fine and suitable only for use with pressure, 
 
 orij^inal Freiirb make, with glazed flange and nipple, 200 mm long by 25 mm diameter 1.25 
 
 Filter Cylinder. Pasteur-Chamberland, Bougie "F," i. e., of coarser texture and suitable for ordinary 
 
 flltratiiKi.v; s:iinc .-:inc and shape as above 1.25 
 
 Filter Cylinder, Berkefeld, of same shape as Pasteur Chamberland, i. e., with glazed flange and nipple; 
 
 may be ii^ed iiilerchangeably with these in the pressure apparatus 3.00 
 
 Filter Cjiinder, Maassen, of unglazed German porcelain with glazed flange at top, for use by the 
 
 Maas.^en, Heichel or Silberschmidt method, i, e.,with asbestos ring between the flange and the 
 
 lop of 1 he filter flask; 130 mm long by 35 mm diameter 1.25 
 
 Filter Cylinders, Berkefeld, of the same shape and for the same purpose as above. 
 
 Length, inches. , 
 
 JJiameter, inches 
 
 Each 
 
 Filter Balloon, Pukal, of unglazed Royal Berlin porcelain. 
 
 {'apaeity, cc 
 
 Each 
 
 5i 
 2.50 
 
 lA 
 
 ico n 
 
 3.00 
 
27722. 
 27724. 
 
 Filter Apparatus for Pressure. Hill, for the use of hydraulic pix'^surc. By this method the material to 
 be filtered is separated from the pressure mediuiu by a soft rubber membrane. This avoids foam- 
 ing and also permits the use of water instead of air pressure. City water service will usually 
 furnish 40 lbs. per square inch, which is about three times the pressure of a vacuum filter. The 
 force pump supplied increases this to 300 lbs, per square inch. At the left top of the chamber 
 is a block tin funnel and tube, through which the liquid is introduced to the filter. To this tube in- 
 side the chamber aflexible rubber tube connects the soft rubber filter bag. Within this bag is placed 
 the Berkefeld, or similar, bougie, the nozzle of which fits through a bushing at the bottom of the 
 filter chamber and delivers the filtered liquid below. The side funnel tube of tin is soldered 
 into a brass nut, which, together with the tube, is readily removable for sterilization. There 
 is a rubber washer at the base of this nut and a screw stopper in the funnel to prevent back flow 
 under pressure. When filled the screw plug is inserted in the funnel and the contents of the bag 
 may be subjected to the required pressure. The three-way cock enables one to admit water to the 
 chamber, to close the chamber from the service pipe, leaving it under pressure, and to drain 
 the chamber. The vertical pipe with pressure gauge at the top is an air pressure storage chamber 
 and is for the purpose of keeping a fairly uniform pressure without continuous pumping. There 
 is a vent cap at the top. This should be kept tightly closed. If it leaks, air will be gradually 
 forced out and the chamber will be kept filled with water. In that case its usefulness would be 
 temporarily impaired and, moreover, a single stroke of the pump would then raise the pressure 
 beyond a safe point. Complete with one S x 1 inch Berkefeld cylinder and 1 liter rubber 
 bag 92.00 
 
 Extra Rubber Bag, 1 liter capacity 1.50 
 
 " " " 150 cc capacity 1.35 
 
 Filter Apparatus, for filtering toxins by means of pressure. As supplied by us to the Antitoxin Lab- 
 oratories of the Philadelphia Board of Health. Consisting of a cast iron bowel, enameled inside, 
 20 inches deep and 6 inches in diameter, with air-tight cover held down by four wing nuts, and with 
 pressure cock attached and bracket for fastening on wall. Attached below is a detachable, 
 nickel plated metal cylinder with a ground in stopper, carrying a Berkefeld cylinder 10 x 2 
 inches. Price includes the Berkefeld cylinder .50.00 
 
 Filter Apparatus for Pressure, Chamberland-Pasteur. 
 
 pump and Pasteur-Chamberland cylinder. 
 Duty Free 45.00 
 
 Original French make, with manometer, pressure 
 Stock 60.00 
 
 Filter Bags, of felt. 
 
 Capacity, quarts 1 
 
 Size, inches 8^ x g 
 
 9^ X 10 12 X 13^ 
 .70 1.25 
 
No. 27736 
 
 Ultrafiltration Apparatus, Bechhold, as used in the Kgl. Institut fur Experiment. Therapie, Frankfurt, 
 a. M., consisting of a double filtration apparatus, one with stirrer and one with glass trough, with 
 ground-on lid, separatory funnel, manometer and twelve clamps, but without the ultrafilter 
 discs. 
 Duty Free 80.00 Duty Paid 115.00 
 
 Ultrafilter Discs, Bechhold, for use in the above apparatus, as used for filtering and separating 
 colloids and crystalloids, iilhnnifnnirl^- nlbumoses, ferments, soaps, etc., as well as for testing 
 beer, milk, etc. In Physioloi. i 1 ' I i i , -.; ly it i.? most useful in the examination of animal fluids 
 such as urine, serous liquid, I.:.. . i I in Bacteriology during the examination of the prod- 
 ucts of bacterial growth (fnxu!.- :i h'I ; ni id.ixins); while in Pharmacology, filtration of decoctions 
 and extracts is facilitated Ijy its use. The permeability of the ultrafilter to various colloids de- 
 pends on its density, i.e., to the percentage content of nitrocellulose in the acid collodion im- 
 pregnating the filter, i.e., the higher the percentage the denser the filter. A 4^' , ultrafilter 
 win, generally, prevent the passage of haemaglobin from a 1',!^ solution. Small variations in either 
 direction can not be coniplctely avoided. Each filter is sent out between perforated pergament 
 paper immersed in water to which a little chloroform has been added to prevent the growth of 
 micro-organisms and the whole contained in an aluminum case sealed by a rubber ring, as after a 
 filter becomes dry it is useless. The filters are impregnated in vacuo with acetic acid collodion 
 and are supplied under the designations of 1|, 3, 4^, 6 and 7i%, according to the content of nitro- 
 cellulose in the collodion. The filters are 90 mm in diameter. 
 
 Designation \\% 3-^ W", _ ^ % 1^% 
 
 Duty Paid, per case of 10 .90 1.20 1.40 1.75 2.00 
 
 References. 
 
 Kolloidsludicn wit der Fillrationsmethode {Ultrajiltratio n) von I! . Bcchholil, Zcitschrift fiir physikal 
 
 Chemie, LX. 3, 1907. 
 Die Gallertfiltration ( UUrafiltration) von II. Bechhold. Zeilschrifl filr Chemie und Industrie der 
 
 Kolloide, Bd. II, Heft 1 und 2 
 UUrafiUraiion von II. Bechhold, Biochemische Zeitschrijt 6, Heft 5 und 6. 
 ntrajUlnitlnnund Ultrafilter vun Prof . Dr. E. Bertarelli, Zentralblatl fur Bakterlolocjie Y2, nr iS 
 
 vhd "'J 
 1111 J I I I TI / 0, nr.SO. 
 
 D lit! 1 •alion von E. Hatschek, Zeitschrift fur 
 
 Che 
 T cr / Hilfe der Ullrajiller von A. v. Lebedew, 
 
 1 
 r de Brasser e I '^5 7 1910 par M. H. Van Laer. 
 
 Pi hi old I ai Bemn Pie I Festschrift 430-433 . 
 
 r I Urafiltratio ion Bur n, Pfiuger's Archiv. d. Physiol. 136, 
 
 1 b 
 
 Filter Discs, Alundum. These discs can be advantageouslj used to replace perforated porcelain plates 
 in many operations, obviating the necessity of preparing an asbestos mat. They are easily 
 cleaned by reverse washing and ignition, permitting of their repeated use. They are supplied 
 in two degrees of porosity RA 225 Medium and RA 98 Porous, which must be specified in order- 
 ing. Edges are moulded to a 60° bevel to fit funnels. 
 
 Diameter, inches f 1 2 3 4 5 6 7 8 
 
 Thickness, inches iV tV ^ J ve_ -i\ tV } i 
 
 Each 25 .25 .35 .50 .75 1.00 1.25 1.50 1.75 
 

 27753. 
 27756. 
 
 27760. 
 
 27761. 
 
 Filter Cones, Alundum. These may be used in any tiO° funnel by stretching a wide band of rubber 
 tubing over the funnel. They have a largo filtering area and can be thoroughly washed from 
 all soluble salts and are recommended for the filtration of gelatinous and slow filtering sol- 
 utions. They may be cleansed by reverse washing, reduced to a constant weight by ignition 
 and used repeatedly. They are furnished in three degrees of porosity, KA 320 dense, RA 321 
 medium and llA 322 porous. Please specify porosity in ordering. Each cone is supplied with 
 wire stand as shown in illustration. 
 
 Diameter, inches Ij 2| 4j 
 
 Capacity, cc 30 50_ _ 100_ 
 
 Each 30 " .35 " .50 
 
 Rubber Gaskets for use with any of the above 05 
 
 Filter Dish, Alundum. Will fit into the top of any 60° funnel and affords a rapid means of filtering 
 large amounts by suction. Well adapted to organic w-ork. Supplied in three degrees of 
 
 porosity, HA 84, RA 360 and RA 9S. Diameter 5f inches, capacity 400 cc 1.50 
 
 Rubber Gasket for use with above Dish 50 
 
 Filter Paper, White, A. H. T. Co. Special. This paper is offered for qualitative work and general manu- 
 facturing purposes, as being unequalled in strength, uniformity of texture and clear and rapid 
 
 filtering. We have supplied this paper in large quantities to leading college and uni\ 
 
 for I 
 
 oratories throughout the U. 
 
 Diameter, mm 75 
 
 Price per 100 Tl¥ 
 
 Diameter, mm 200 
 
 Per 100 ^33 
 
 Filter Paper, White, A. H. T. Co. Special 
 
 in qualitative chemistry. 
 90 100 110 
 
 250 
 .46 
 
 330 
 .70 
 
 3S0 
 
 4.50 
 1.20 
 
 500 
 1.50 
 
 uty lab- 
 
 180 
 
 .26 
 
 600 
 
 2M 
 
 Same as above, in sheets 480 x 4S0 mm. Per 100 1.36 
 
 Filter Paper, Gray, A. H. T. Co. Very tough and durable. Especially designed for pharmaceutical 
 and manufacturing purposes. 
 
 Dhameter, mm J^OO 125 loO 180 200_250_330 380 450 500 600 
 
 Per 100 11 .14 .18 .24 .28 .40 .60 .76 1.10 1.40 1.80 
 
 Filter Paper, Gray, A. H. T. Co. Same as above, in sheets 500 x 500 mm. Per 100 1.25 
 
 Filler Paper, Baker & Adamson, washed in hydrochloric acid, very rapid filtering, all soluble salts re- 
 moved ("single washed.") 
 
 Diameter, mm 55 70 90__ 110 125 150 
 
 Per 100 15 .30 .45 ..55 .60 .85 
 
 Filter Paper, Baker & Adamson, "A" Quality, thin paper, very rapid filtering, for general analytical 
 works verv low ash. 
 
 Diameter," mm .55 70 90 110 125 150 
 
 Ash in each paper JlOOOl .00002 .00003 .00005 000065 .0 00093 
 
 Per 100 .40 .50 .65 .80 1.00 1.20 
 
 Filler Paper, Baker & Adamson, "B" Quality, dense paper for filtering Barium Sulphate, Calcium 
 Tixalate, and other troublesome precipitates, also rapid filtering. 
 
 Diameter, mm .55 70 90 110 125 130 
 
 .4sh in eiich paper 00006 ,00012 .00018 .0003 .0004 .0005 
 
 Per 100 .40 .50 .65 .80 f.OO 1.20 
 
 Filter Paper, Munktell, No. 00. For special scientific work — washed in hydrofluoric and hydrochloric 
 acids. Cut in round filters, 100 filters in a package, five packages in a box of birch bark. 
 
 Diameter, mm 55 70 90 110 125 150 
 
 Ashes, gram O.OOO Oll 000018 0.000030 0.000045 .000 058 . 000083 
 
 Per 100 ^0 .55 .80 1.00 1.10 h25^ 
 
 Filler Paper, Munktell, No. 0. Washed with hydrochloric acid, removing traces of iron, alumina, lime, 
 etc. The ash is reduced to a minimum, and a high standard of purity is secured. A uniform and 
 quick filter, retaining fine precipitates, adapted to the most precise requirements of analytical 
 work. Cut in round filters, 100 filters in a package, five packages in a box of birch bark. 
 
 Diameter mm 55 70 90 110 125 150 185 
 
 Ashes, gram 0.000060 0.00010 0.00017 0.00025 0.00033 0.00046 0.00070 
 
 Per 100 . 
 
 .27 
 
 .42 
 
 .55 
 
 .63 
 
 .85 
 
 1.25 
 
Filter Paper. Munktell, No. 0. s ime i a-bo\e in shepts 4S[) x 4SU mm. Per quire 2.50 
 
 Filter Paper. Munktell, No. IF. Ihe Original Swedish Paper. Of best linen material, by some claimed 
 to be the most perfect filtering paper mdde !edve'> jne-third less ash than formerly, probably 
 the smallest amount of any of unwashed paper. Cut in round filters, 100 filters in a package, 
 five packages in a box of birch bark. 
 
 Diameter mm 55 70 90 110 125 150 185 
 
 Ashos, gram OO O U 0.00023 0.000.38 000056 0.0007-3 0.00105 0,00161 
 
 Per 100 .11 ,16 .25 .30 :40 ^0 J5~ 
 
 ■ Paper, Munktell, No. IF. Same as above in sheets 480 x 480 mm. Per quire 1.20 
 
 r Paper, Munktell, No, 2. A pure white tinen paper of medium thickness, not as closely made, 
 therefore more rapid in filtration. A superior paper for all laboratory work. 
 
 Diameter mm ,55 70 90 110 125 150 185 
 
 Ashes, gram 0_ 00018 0.00030 0.00051 0.00074 0.00095 0.00138 0.00209 
 
 Per ino .10 .1.3 .20 ' .26 .31 ^0 ^3~ 
 
 27S0S. Filter Paper. Munktell, No. 2. Same ns above in slieet'^ 480 x 4S0 mm. Per quire I.OO 
 
 ;7S0O. Filler I 
 :7804. Filter I 
 
 27816. 
 27820. 
 
 27824. 
 27828. 
 
 Filler Paper, C. S. & S.. No. .J95. A jj;oo(l light paper, free of chlorine and tasteless, made of the best 
 material. A filter of 15 cm diameter filters 100 cubic cm of water in 50 to SO seconds. 
 
 Diameter mm 55 70 90 1 10 125 150 185 240 270 3 20 385 
 
 Per 100 10 .11 .16 .18 .20 .28 T34 ^5~ TSS 1.05 1.25 
 
 FilterPaper, C. S.&S.,No.595. Same as above in sheets 470 x 540 mm. Per 100 2.20 
 
 Filter Paper, C. S. & S.. No. 597. A stouter paper than the foregoing, perfectly white and clean, filters 
 very quickly (100 cubic cm of water pass through a plain filter of 15 cm diam. in SO to 100 
 seconds). A standard paper for analytical purposes. 
 
 Diameter mm 55 70 90 110 125 150 
 
 Per 100 .15 .16 ~ " "^2 .2S~ ^30~ .38 
 
 Diameter mm 185 240 270 320 385 500 
 
 Per 100 ,48 .75 1.00 1.20 1^55 2.^0 
 
 Filter Paper. C. S. & S. No. 597. Same as above in sheets 580 x 580 mm. Per 100 4.20 
 
 Filter Paper, C. S. & S. No. 571, fat extracted for milk analysis. See M. A. Adajns "Analyst" 1886, 
 p. 4S. In strips 56 x 65 mm. Per 50 strips I.75 
 
 Filter Paper, C. S. & S. No. 604, soft. This paper is similar to No. 597 but has the additional advantage 
 of possessing rapid filtering in the highest degree. In all cases where quick working ia desired 
 this paper is most suitable, excepting where the precipitate to be filtered, is very fine and requires 
 a closer and harder paper. 
 
 Diam., mm 55 70 90 110 125 150 185 2 40 270 320 38 5 500 
 
 ., Per 100 15 .16 .22 .28 ..30 .38 .48 "75 1.00 ""1720 ~T:55~2:60 
 
 Filter Paper. C. S. &.S. No. 604. in sheets 580 x 580 mm. Per 100 sheets 4.20 
 
Filter Paper, C. S. & S. No. 575. Hardened filters, especially adapted for use with the filter pump as 
 they cliiit; closely to the sides of the funnel. These hardened filters will retain the finest pre- 
 cipitates and resist pressures of 2 or 3 atmospheres when racist. Another important feature is 
 durability in continued use, one sheet of this paper being available for several operations, as 
 the precipitate can be scraped off without removing the fluff from the filter. They are probably 
 the only papers which are suitable for the filtration of caustic liquids, requiring a long time to 
 deposit, such as solutions of bichloride of tin (SnCL), chloride of antimony (SbCU) also acids 
 and strong alkalies. 
 
 Diameter mm 40 55 
 
 Per 100 ~i2 .52 
 
 Diameter nmi 185 
 
 Per 100 1 70 
 
 Filter Paper, C. S.&S. No. 588. Fnided Filters. F. 
 
 Diameter mm 125 
 
 Per 100 32 
 
 Filter Paper, C. S. & S. No. 589 "Black Ribbon." Washed in hydrochloric and hydrofluoric acid, of soft 
 and very loose composition, filtering very quickly. Used for deposits which do not pass through 
 easily, as is the case with many metals. Specially adapted for use in laboratories of metal- 
 lurgy. For BaS04 and similar deposits passing through easily, these filters should not be used. 
 
 Diameter mm .55 70 i)0 110 125 150 
 
 Ashes, gram 00004 .00q07_ _ .00011 ^^00017^ .00 021 .00025 
 
 Per 100 52 .$5 .82 1.00 1.10 1.30 
 
 Filter Paper, C. S. & S. No. 589 "Blue Ribbon." Washed in hydrochloric and hydrofluoric acid, and 
 made from close, firm material. We recommend them to be used in connection with an air-pump 
 or if possible as folded filters. They are suitable for the finest precipitations, which are not kept 
 back by the black or white ribbon. 
 
 Diameter mm 55 70 90 110 125 150 
 
 Ashes, gram . 0004 . 00007 . 0001 1 . 00017 . 00021 . 00025 
 
 Per 100 52 .55 .82 1.00 1.10 1.30 
 
 l liter Paper, C. S. & S., No. 589 "White Ribbon." Washed in hydrochloric and hydrofluoric acid. Suit- 
 
 27872. 
 27876. 
 
 27884. 
 27888. 
 
 70 
 
 30 
 
 110 
 
 12,5 
 
 1.50 
 
 .56 
 
 240 
 
 .82 
 270 
 
 1.00 
 
 320 
 
 1.10 
 
 SS.5 
 
 1.30 
 
 .500 
 
 2.60 
 
 3.40 
 
 4.1.5 
 
 5.50 
 
 9.00 
 
 ineral use. 
 
 240 
 
 .320 
 
 3.S5 
 
 .500 
 
 .48 
 
 .68 
 
 1.10 
 
 1.45 
 
 2.40 
 
 ■ and retain a properly treated 
 
 able for most analytical purposes. These filters filter quick 
 deposit of BaSO^. 
 
 Diameter mm 55 70 90 110 125 150 
 
 Ashes, gram .00004 .00007 .00011 .00017 .00021 .00025 
 
 Per 100 .52 ' ..55~ " ^2 TM TTlO 1.30 
 
 Filter Paper, C. S. & S„ No. 589 "Yellow Ribbon." Washed in hydrochloric and hydrofluoric acid. 
 The filters of this brand are identical with the brand "white ribbon" but after being freed of 
 mineral constituents, they are also treated with ether. 
 
 Diameter mm 55 70 90 110 125 150 
 
 Ashes, gram 000O4 .00007 .00011 00017 ,00021 .00025 
 
 Per 100 .65 .70 1.05 1.25 1.40 1.65 
 
 Filler Paper, C. S. & S., No. 590. These filters, which are also treated with HCI and HFl are thinner 
 than the brands specified under No. 589. They therefore contain slightly less ash and filter 
 and are slower than No. 589 — white ribbon — but otherwise readily retain fine precipitates. 
 
 Diameter mm 55 70 90 110 125 150 
 
 Ashes, gram 00002 .00003 .00005 ,00007 .00009_ 00013 
 
 Per 100 65 .70 1.05 " 1.25 1.40 " 1.65 
 
 Filter Paper, C. S. & S., No. 602, hard or extra hard, a paper of especial density and hardness. 
 The finest particles or precipitates which no other paper can filter are retained. Consequently 
 these papers must not be expected to work quickly and they are recommended for use with an 
 air pump or as folded filters. The "hard" filters are supplied if grade is not specified in ordering. 
 After filtration through these papers the superphosphates are rendered soluble for the purpose 
 of determining the amount of the phosphoric acid soluble in water, and solutions which are to 
 be polarized and impregnated with acetate of lead, become clear at once. 
 
 Diam., mm 55 JO 90 110^ 125 150 185 240 270_ 320 385 500 
 
 Per 100 ^22 .26 .34 .42 .44 .55 .72 1.10 1.45 "1.75 2.30 3.80 
 
 FilterPaper, C. S.&S.No.602,hardor extra hard, in sheets 580 x 580 mm. Per 100 4.20 
 
 Filter Paper, C. S. & S. No. 591, an extra heavy and strongpaper, specially adapted for the filtration of 
 liquors, fruit juices, syrups and oils, and does not give off any hairs or fuzz to the filtrate. In 
 sheets 580 x 580 mm. Per 100 _ 5.80 
 
 Filter Paper. C. S. & S. No. 551, a deep black filtering paper, specially adapted for filtering light col- 
 ored sediments and for drop reactions of the same nature. These papers are not acted upon by 
 water, alcohol, ether diluted acids or alkalies. 
 
 Diam., mm 55 70 90 110 125 _ 150 1S5 
 
 Per 100 22 .26 .34 .42 .44 .55 .70 
 
 Filter Paped, C. S. & S. No. 601, for drop reactions. In sheets 140 x 220 mm. Per 100 2.35 
 
 Filters, Folded C S. & S. No. 580, with parchmentized points to prevent breaking under pressure. Spe- 
 cially recommended for the filtration of molasses, fruit juices, liquors and caustic solutions. 
 
 Diam., mm 320 385 .500 
 
 Per 100 1.40 1.75 2.70 
 
 Filter Cones, C. S. & S. No. 574, consisting of semi-circular discs of No. 575 hardened filter paper, for 
 folding. An excellent substitute for platinum cones. 
 
 Diam.:mm 55 70 90 _ 110 125 1.50 1S5 _ 240 
 
 Per 100 42 .46 .62 .76 .85 1.00 1.30 ~ 2.00 
 
<io iin 
 
 
 12.5 
 
 150 
 
 185 
 
 .26 .29 
 
 240 32(1 
 
 
 .33 
 
 380 
 
 .37 
 
 450 
 
 .50 
 
 500 
 
 .81 1..31 
 
 
 1.83 
 
 2..51 
 
 2.81 
 
 ihed with hydrochloric 
 90 110 
 0.0O0.5 O.OOOS 
 
 acid. 
 
 125 
 0.001 
 
 150 
 0.0016 
 
 .41 
 
 .54 
 
 
 .65 
 
 .82 
 
 2789(i. Filler Paper, Dreverhoff, No. 8(>, crimped fast filters, heavy, dense and pure white. These papers filter 
 more rapidly than any other, the filtering surface being increased 60% by the crimping. Spec- 
 ially adapted for sugar work and for filtration in silica determinations. 
 
 Diam., mm .m 70 
 
 Per 100 14 .20 
 
 Diam., mm -OO 
 
 Per 100 (i4 
 
 27900. Filter Paper, Dreverhoff, No. 207, rapid filtering, wasl 
 
 Diam., mm 55 70 
 
 Ash per filter, grams. . 0.00010 0.0003 
 
 Per 100 .22 .27 
 
 27904. Filter Paper. Dreverhoff, No. 400, washed with hydrochloric and hydrofluoric acids; of very close tex- 
 ture, retaining the finest precipitates. Although very strong, it filters rapidly. 
 
 Diam., mm 55 70 90 110 125 150 
 
 Ash per filter, grams . 0,00003 O.OOOOG 0^00009 0.00014 0.00018 Q.Q0028 
 
 Per 100 " .52 .78 l.Oft 1-50 1.68 1.98 
 
 27908. Filter Paper, Dreverhoff, No. 417, washed twice with hydrochloric and hydrofluoric acids; retains fine 
 precipitates such as barium sulphate, etc. 
 
 Diam., mm 55 70 90 110 125 150 
 
 Ash per filter, grams. _0.00002 0.l.)004 0.00006 0.00009 0.00012 0.00019 
 
 Per 100 ~ T67 .95 1.34 1.73 1.96 2.28 
 
 27912. Filter Paper, Dreverhoff, No. 206, a superior white paper for general qualitative and pharmaceutical 
 work, retaining fine precipitates. 
 
 Diam., mm 55 70 90 110 125 150 IS5 240 320 400 500 
 
 Per 100 .13 .15 .20 .23 .27 .30 .38 .58 1.02 1.91 2.18 
 
 27916. Filter Paper, Dreverhoff, No. 206, in sheets 450 x 450 mm. Per quire 56 
 
 27920. Filter Paper For Agar, A. H. T. Co. Special, sometimes designated as " Lautenschlaeger" filter paper. 
 .\ heavy, white paper with rough surface. Specially recommended for filtering agar and other 
 culture media. In sheets 400 x 400 mm. Per 100 2.50 
 
 27924. Filter Paper, white, so called "bibulous" paper Per ream 3.00 Per quire .20 
 
 27928. Filter Paper, Chardin, as used and specially recommended for filtering agar agar in preparation of 
 culture media. The filters are already folded and come in boxes containing 50 of the 32 cm size 
 and 25 of the 50 cm size. 
 
 Diameter, cm -32 50 
 
 Per box 1. 00 " .70 
 
 27932. Filter Paper, Chardin, in sheets 58 cm square. Per 25 sheets 1.50 
 
 27936. Filter Paper, Prat-Dumas, white, in sheets, 17 x 21 inches. Per quire .20 
 
 Per ream 3.50 
 
 27944. Filter Paper, Dialyzing, Morochowetz, C. S. & S., a specially cut and folded membrane of parchment 
 |->ai)Pr. They are folded ready for use in funnels from 12° to 15° angle and 250 mm high. No. 
 521 is thick and No. 522 thin. 
 
 S. & S. number 521 522 
 
 Per package of 25 2.70 2.00 
 
 Note — For Funnel for use with above Dialyzing Filters, see No. 28582. 
 
 27948. Filter Racks, for holding the filter paper away from the sides of the funnel; made of galvanized iron 
 wire and rubber ring. May be folded to serve as squeezer. 
 
 Diameter, inches 5 7i 9 12 
 
 Each 30 .40 .50 .75 
 
 27952. Filter Paper Box, of japanned tin, holding five sizes of circular filters from 3 to 71 inches in diameter. 
 \'erv convenient in the laboratory as it provides ready access to clean filters at alt times 2.50 
 
ARTHUR H. THOMAS COMPANY 
 
 2795(j. Filter Press, Laboratory, complete with pressure pump, three filter frames of different thickness and 
 
 three sets of filter cloths. Exposed filtering surfaoo is 400 sq. cm. Press is of iron on heavy iron 
 
 base. 
 
 Duty Free 45.00 Duty Paid 60.00 
 
 279G0. FilterPress, Laboratory, na above but of bronze 
 
 Duty Free 60.00 Duty Paid 80.00 
 
 279fi4. FilterPress, Laboratory, with two pumps, one for pumping the material for filtration into the press, 
 
 the other to pump in the bleaching solution. Complete with three filter frames and three sets 
 
 of filter cloths. With an exposed filtering area of -iOO sq. cm. 
 
 Duty Free 60 00 Duty Paid 80.00 
 
 27968. FilterPress. Laboratorv, with press an!!ri[\fr z nil HI ron 
 
 Duty Free SO 00 Dut Paid 120.00 
 
 27976. 
 27980. 
 279S4. 
 
 27988. 
 27992. 
 27996. 
 
 28000. 
 
 28004. 
 28008. 
 
 Filter Pump, Chapman, of polished brass. For operation under ordinary water pressure either on 
 faucet or directly connected to water supply pipe. Length, inches. Sf 4^ 5| 
 
 Each 1.35 1.75 2.00 
 
 Filter Pump Couplings, of brass, with faucet thread. Style and size of filter pump must be given when 
 ordering 35 
 
 Filter Pump Couplings, of brass, for connecting with faucet without threads. Style and size of filter 
 pump must be given in ordering 55 
 
 Filter Pump, of brass. New patent form. More efficient than the Chapman. 
 
 Length, inches 3^ 4f 5| 
 
 Each 1".35 1.75 2.00 
 
 Filter Pump, Geissler, of glass SO 
 
 '' •' Muencke, of glass, with one suction tube. 1.25 
 
 two 
 
 1.50 
 
 I pump. 
 
 13 
 
 7.50 
 
 Filter Pump, Richards, of brass. A very powerful 
 
 Length, inches V 7 
 
 :Size pipe fitting thread, inches j f 
 
 Each 1.25 ~ 2.00 
 
 Filter Pump, On Base, with stopcocks for water and air connections . 10.00 
 
 Filter Pump, Water Jet Form, displacing § cu. ft. of air per minute with 20 lbs. water pressure. Will ex- 
 haust a 1 gallon vessel to a vacuum of 295 inches of mercury in 10 min. with a 10 lbs. water pres- 
 sure and in 5 min. with a 20 lbs. water pressure. Very useful for filtrations, percolations and 
 distillations in laboratory work. Complete with vacuum gauge, connecting tee and two stop- 
 cocks _ 12.00 
 
 Filter Pump, as above but for operating by steam instead of water, with steam connections .... 12.00 
 
No. 28064 
 
 No. 2S072 
 
 28020. 
 28024. 
 
 28028. 
 
 28032. 
 
 280-5(;. 
 
 28040. 
 28044. 
 
 28048. 
 
 28052. 
 
 280^4. 
 
 28068. 
 
 28072. 
 28076. 
 
 Filter Pump, for both suction and pressure; with metal reservoir. Filter pump is removable. Stop- 
 cocks and fittings are nickel plated and reservoir is of zinc finished in bronze lacquer. . . . 8.00 
 
 Filter Pump, as above, with manometer - 15.00 
 
 Metal Band for either of above, with holes to conveniently screw to wall .50 
 
 Filter Tubes, for filtering through asbestos, glass wool or glass powder. 
 
 Length, mm _ 150 200 
 
 Each .10 .15 
 
 Filter Tube, Fresenius, with bulb, 20 mm inside diameter at top 20 
 
 Filter Tubes, for use with Gooch, Alundum and similar crucibles. Tube of 32 mm inside diameter is 
 suitable for Gooch crucible No. 25294, 25 cc or Alundum crucible No. 25266, 25 cc. Rubber 
 tubing suitable for making air-tight connection with Gooch crucible is listed under No. 46236, 
 
 Inside diameter at top, mm.. ^8 20 25 2S 32 37 _ _ 40 
 
 Each 18 .20 .22 .25 .30 ..35 .40 
 
 Flask, Acetvlization, with ground in condensing tube, as used in determining menthol in oil of pepper- 
 mint, etc 1.25 
 
 Flasks, Assay, Best Bohemian Glass. Capacity, cc 50 
 
 Each ~15"" 
 
 Flasks, Assay, Best Bohemian Glass, conical high form, with narrow mouth and spout. 
 
 Capacity, cc 50 100 
 
 Each 15 .20 
 
 Flasks, Assay, Best Bohemian Glass, conical wide form, with spout. 
 
 Capacity, cc 50 lOn 
 
 Each 15~ .20" 
 
 Flasks, Assay, Best Bohemian Glass, pear shape, with long neck. 
 
 Capacity, cc 50 
 
 Each .12 .15 .25 
 
 Flasks, Best Bohemian Glass; light weight, low form, with extra wide mouth and fiat bottom, so- 
 called Carbonic Acid flasks. Capacity, cc 25 50 100 150 250 
 
 Each .10 .12 .15 .20 ' .25 
 
 Flask, for Copper Determinations, with flaring neck. Capacity, cc ISO 250 
 
 Each 20 ^ 
 
 Flasks, Joliet, much heavier than boiling flasks but made to stand heat; as used in iron and steel 
 
 analyses. Capacity, cc 50 1000 2000 
 
 Each 25 .35 ^60 
 
 Flasks, Johnson, for Sulphur Determination, for use in iron and steel analysis. With heavy ring neck, 
 taking a No. 6 rubber stopper, capacity 275 cc to base of neck; height 165 mm 25 
 
 Flasks, Low, for Copper Determination; cylindrical neck with flaring top. 
 
 Capacity, cc 125 250 
 
 Each Tl8 ;30 
 
 Flasks, Soil Analysis, of Jena Glass, witii long condenser tube ground in with air tight joint. 
 
 Capacity, cc 200 500 
 
 Each 1.60 2.00 
 
 100 
 
 250 
 
 .18 
 
 .20 
 
 550 
 
 500 
 
 .25 
 
 .30 
 
 250 
 
 500 
 
 .25 
 
 .30 
 
 100 
 
 250 
 
-'^'^'^'^L:R H. T ho, mas company 
 
 ^"- -i^"^^ No, 28088 No. 2t)lJU2 No. IWJU No. 2S104 
 
 Flasks, Best Bohemian Glass, flat bottom, vial mouth, with uniform necks. 
 
 Capacity, cc 2.5 50 100 150 200 250 300 400 500 750 
 
 To take stopper No 123344556 
 
 Each .07 .08 .10 A2 ~^4 " .IG .17 .18 .20 !25 
 
 Capacity, cc 1000 1500 2000 3000 4000 6000 8000 12000 20000 
 
 To take stopper No _ 6 7 9 10 10 10 10 11 13 
 
 *^»<^h .30 .35 .45 .60 ^0 1.00 1.50 2.00 TSO 
 
 Flasks, Best Bohemian Glass, flat bottom with heavy ring neck. 
 
 Capacity, cc 25 50 100 150 200 250 300 400 
 
 1 o take stopper No 1 2 3 3 4 4 5 
 
 Each. ^07" W ~7i0 :i2 A4 .U A7 A~S 
 
 Capacity, cc 500 750 1000 1500 2000 3000 4000 
 
 To take stopper No 5 ,j ,] 7 9 10 10 
 
 Each 20 .25 .30 .35 .45 .60 .80 
 
 Flasks, Best Bohemian Glass, round bottom, with vial mouth. 
 
 Capacity, cc 50 100 250 500 750 1000 1500 2000 4000 
 
 To take stopper Mo 1 2 4 5 G 7 9 10 
 
 Each .OS .10 .16 .20 .25 .30 .35 .45 .80 
 
 Flasks, Whitall Tatum "Nonsol" Glass, flat bottom, with vial mouth. Very insoluble in water, 
 alkalis and acids and specially recommended for uniformity of shape. By special arrangement 
 with the manufacturer we are enabled to offer these Flasks for immediate shipment from our 
 own stock at original net factory prices. 
 
 Capacity, cc 60 120 180 250 500 1000 2000 
 
 To take stopper No 1 2 3 4 5 __6 9 
 
 Each Til " .13~~ .14 ^5 ^0 'M A5 
 
 Flasks, Whitall Tatum Regular Glass, flat bottom, vial mouth, widely used in industrial laboratories 
 because of their uniform shape which is identical with the illustration of "Nonsol." By special 
 arrangement with the manufacturers we are enabled to offer these Flasks for immediate ship- 
 ment from our stock at oiiginal net factory pricrs- 
 
 Capacity, cc 30 60 120 180 250 500 1000 2000 4000 8000 12000 
 
 Each .08 .09 .10 .11 .12 .15 .23 .35 .75 1.25 2.00 
 
 Flasks. Wash Bottle, with stout ring neck to withstand corking. The heavy wall of these flasks makes 
 them much more durable under mechanical stress than the ordinary boiling flask. 
 
 Capacity, cc 250 500 1000 2000 
 
 To take stopper No 3 5 6 7_ 
 
 Each ~.1.5 .20 .35 .50 
 
 Flasks, Opaque Fused Silica. These flasks are sufhcicntly transparent to enable the level of a liquid 
 to be determined. They are furnished with either round or flat bottom and are admirably 
 adapte<] for direct heating by electric resistance wires for boiling at high temperatures, etc. 
 
 Capacity, cc 50 100 150 200 250 500 1000 
 
 Each 2.75 4.00 4.25 5.00 6.25 7.50 16.00 
 
 Flasks. New Jena Glass, round bottom, with vial mouth. See illustration on following page. 
 
 Capacity, cc 50 100 150 200 300 400 
 
 To take stopper No _i^ 3^ 3 4 5 5 
 
 Each U .12 .14 .16 "7l9 .23 
 
 Capacity, cc 500 700 1000 1500 2000 3000 
 
 To take stopper No _5 _6 7 _8_ 10 
 
 Each 26 .32 .38 .45 .53 .68 
 
Flasks, New Jena Glass, ll;it bottom with vial mouth. 
 
 Capacity, cc 50 100 IJO 
 
 To take stopper No I 
 
 Each 11 -12 .14 
 
 Capacity, cc .500 700 1000 
 
 To take stopper No 7 
 
 Each 26 -32 .3S 
 
 Flasks, New Jena Glass, fiat bottom, with heavy ring neck. 
 
 Capacity, cc 
 
 To take stopper No 
 
 Each 
 
 Flasks, New Jena Glass, round bottom, with sliort ring neck. 
 
 Capacity, cc 50 100 150 200 
 
 To take stopper No 2 _3 3 
 
 Each 13 .14 .16' .19 .23 
 
 Capacity, cc 1500 2000 3000 400O 
 
 To take stopper No 
 
 Each ..<5 
 
 Flasks. New Jena Glass, routnl bottom with long ring neck 
 
 .16 
 
 1500 
 
 .500 
 
 
 .19 
 
 2000 
 
 400 
 4 
 
 .23 
 
 3000 
 
 9 
 
 .68 
 
 300 400 500 
 
 700 1000 
 6 7 
 
 .63 .80 .93 
 
 Prices and sizes 
 
 5000 6000 8000 10000 
 
 11 11 12 12 
 
 1.05 1.40 1.90 2.50 
 
 same as for No. 28124. 
 
 28152. 
 28156. 
 
 Flasks, for Iodine Determinations; with wide, fiaring fumiel shaped lip and hollow, ground in stopper 
 fitted to neck. 
 
 Capacity, cc 125 250 500 
 
 Each T60 .75 TOO 
 
 Flasks, Copper Oxide, for storing CuO in organic analyses. 
 
 Cap.acity, cc " _125 2.511 500 
 
 Each 55 .65 .85 
 
 Flasks, Copper, polished, with ring neck. 
 
 Capacity, cc 250 ,500 1000 2000 
 
 Each 1.75 2.00 2.50 3.00 
 
 Flasks. Copper, polished, as used for Kjeldahl detenninations; 4 inches high, 83 inches diameter, capac- 
 ity 1000 cc 3..30 
 
 Flask, Orlovius, for the sterile drawing and handling of blood for bacteriological purposes, fitted with a 
 ground in glass stopper with two tubulations and a protecting cap 2.50 
 
ARTHUR H. THOMAS COMP.-XNY 
 
 Flasks, Erienineyer, Best Bohemian Glass, with iiariow mouLli. 
 
 Capacity, cc 2,} 50 100 150 200 25U 3U0 400 500 750 
 
 To take stopper No 12 3 3 4 4 5 5 6 
 
 Each 07 ".08 .lo 712 ^4 06" .17 .18 .20 .25 
 
 Capacity, cc 1000 1500 12000 3000 4000 
 
 To take stoppei- No 7 7 9 9 
 
 Each 30 .35 .45 .ftO .80 
 
 Flasks, Erienmeyer, Best Bohemian Glass, with wide mouth. 
 
 Capacity, cc 26 50 100 150 200 250 300 400 
 
 To take stopper No 1 2 3 4 4 5 5 6 
 
 Each 07 '^08 .10 .12 .14 .l(i .17 .18 
 
 Capacity, cc 500 750 1000 15011 21)0(1 :iOO0 4000 
 
 To take stopper No 6 7 7 8 11 12 
 
 Each .20 .25 .30 .35 .45~ M .80 
 
 Flasks. Erienmeyer, Best Bohemian Glass, witli extra wide mouth. 
 
 Capacity, cc lOO 250 50(1 1000 
 
 Each 10 .!(> .20 .30 
 
 Flasks, Erienmeyer, New Jena Glass. 
 
 Capacity, cc 25 50 100 150 200 250 300 500 
 
 To take stopper No 00 1 3 4 5 5 6 6 
 
 Each :09~ -fO Al ^l2 7X3 "^5 "^17 724 
 
 Capacity, cc 600 750 1000 1500 2000 3000 4000 5000 
 
 To take stopper No 6 7 S 9 10 10 10 10 
 
 Each 26 .29 .37 .45 .53 M .85 1.00 
 
 Flasks, Erienmeyer, Whitall Tatum Nonsol Glass. Very insoluble in water, alkalis and acids, and 
 specially recommended for uniformity of shape. By special arrangement with the manu- 
 facturers we are enabled to offer these flasks for immediate shipment from our stock at original 
 net factory prices. 
 
 Capacity, cc 60 120 180 2.50 500 1000 2000 
 
 To take stopper No 5 3 4 5 6 8 
 
 Each Vll ^13 .14 ^15 TiO ^0 ^ 
 
 Flasks, Erienmeyer. Whitall Tatum Regular Glass, widely used in industrial laboratories because of 
 their uniform shape, which is exactly similar to the Nonsol above listed. By special arrange- 
 ment with the manufacturers we are enabled to offer these flasks for immediate shipnaent from 
 our stock at original net factory prices. 
 
 Capacity, cc 60_ 120 _ J.80 250 350 .500 700 1 000 200 
 
 Each 09 " .10 .11 .12 .14 .15 .20 ^ 738 
 
 Flasks, Erienmeyer, Best Bohemian Glass, wil.li ground in glass stopper. 
 
 Capacity, cc 125 250 Ml 1000 
 
 Each 50 .65 .8.5 1.25 
 
 Flasks, Erienmeyer, with very flat, extra wide base, specially constructed for boiling on electric hot 
 plates and for culture flasks. 
 
 Capacity, cc 2o0 _ 500 1000 
 
 Each 18 .24 .45 
 
28192. 
 
 28196. 
 
 28200. 
 
 28204. 
 
 28208. 
 
 28212. 
 28214. 
 28213. 
 
 2821G. 
 28220. 
 
 28224. 
 
 28228. 
 
 28232. 
 
 28236. 
 28240. 
 
 No. 282H; No. 28220 No. 28232 
 
 Fla.sks, Distillation. Best Bohemian Glass, with side tube high on neclv. 
 
 Capacity, cc 30 60 100 250 
 
 Each .15 .20 .25 .30 
 
 Flasks, Distillation, Best Bohemian Glass, with side tube at center of neck 
 
 Capacity, cc 30 60 100 250 
 
 Each .15 .20 .25 .30 
 
 Flasks, Distillation, Best Bohemian Glass, with side tube low on nee];. 
 
 Capacity, cc 30 60 100 250 
 
 Each 15 .20 .25 .30 
 
 Flasks, Distillation, Best Bohemian Glass, with side tube 400 mm long at center of neck 
 
 Capacity, cc 100 
 
 Each .30 
 
 Flasks. Distillation, New Jena Glass, with side tube at center of neck. 
 
 Capacity, cc 50 100 200 300 .500 
 
 Each 22 .24 .29 .34 .45 
 
 Flask, Distillation, Best Bohemian Glass, with side tube bent down at right angle. 
 
 Iihur" Bask. Capacity 500 cc BU 
 
 Flask, Glass, for use with the official Brown-Duvel Moisture Tester. See Bulletin 66 of the U. S. 
 Bureau of Plant Industry 75 
 
 Flask, Copper, Double Wall, for use with the official Brown-Duvel Moisture Tester when same is used 
 for moisture determinations in flour and ground grain substances in which the copper flask la 
 used in place of the glass flask. See Bulletin 58 of the U. S. Bureau of Plant Industry 5.00 
 
 Flask, Distillation, Ladenhurg, with three bulbs in neck. Capacity 500 cc 80 
 
 Flask, Distillation, Hempel, as used in the U. S. Department of Agriculture, Forest Service, for the dis- 
 tillation of creosote. Capacity 500 cc 80 
 
 Flasks, Distillation, Lunge, with trap in neck. Capacity, cc 125 250 500 
 
 Each TSO JO So 
 
 Flasks, Distillation, Claisen. Capacity, cc 50 100 250 500 
 
 1.00 
 
 500 
 
 1000 
 
 2000 
 
 .50 
 
 .65 
 
 1.00 
 
 500 
 
 1000 
 
 2000 
 
 .50 
 
 .65 
 
 1.00 
 
 500 
 
 inoo 
 
 2000 
 
 .50 .65 
 
 r of neck. 
 250 500 
 
 1.00 
 
 1000 
 
 .40 
 
 .60 
 
 .75 
 
 1000 1500 2000 
 
 30O0 
 
 .65 
 
 ngle. 
 
 .78 1.00 
 
 So-called 
 
 1.25 
 
 'sul- 
 
 Made to exact dimensions. 
 
 Each 
 
 Flasks, Distillation, Engler, as used in the coal tar industry. 
 
 Capacity, cc 100 
 
 Each 30 
 
 Flask, Distilling, Engler, Semi-transparent Silica, for use in distillation above 300° C 5.00 
 
 Flask, Opaque Fused Silica, with side arm for distillations. 
 
 Capacity, cc 50 100 1.50 200 2.50 .500 
 
 Each 3.25 4.75 5.00 6.00 7.50 9.00 
 
 250 
 .40 
 
 lOOO 
 18.50 
 
28244, Flasks, Filtering, Erlenraeyer shape, of heavy ^lass to withstand pressure. 
 
 Capacity, cc 250 
 
 Each 25 
 
 28248. Flasks, Filtering, same as No. 28244 but with side neck. 
 
 Capacity, cc 2,J0 500 7.50 
 
 Each 35 .45 .50 
 
 28252. Flasks, Filtering, same as No. 28248 but with side neck and glass stopcock. 
 
 Capacity, cc 25 
 
 Each 1-25 1.50 2.50 
 
 28256. Flasks, Filtering, Erienmeyer shape, of heavy glass, with side neck and tubalation at bottom at 
 opposite side to take ordinary stopper. 
 
 Capacity, cc _ 500 1000 2000 
 
 Each 90 1.20 2.00 
 
 28260. Flasks, Filtering, Erienmeyer shape, of heavy glass, with side tube at neck and in addition tubula- 
 tion with stopcock on opposite side near Dottom. Capacity 1000 cc 2.00 
 
 
 No. Z8260 
 
 
 r,m 
 
 1000 
 
 2000 
 
 .40 
 
 .GO 
 
 .75 
 
 1000 
 
 2000 
 
 4000 
 
 .60 
 
 x.oo 
 
 1.50 
 
 2.50 
 
 500 
 
 1000 
 
 w 
 
 No. 2826-1 No. 282fi8 No. 28273 No. 28276 
 
 28''64 Flask. Filtering, as above, but with ground in stopcock in lower tabulation. 
 
 Capacity, cc 500 _1000 _2000 
 
 Each 1-50 2.00 2.50 
 
 28268. Flasks, Filtering, Erienmeyer shape, of heavy glass, with side tube and with funnel ground into neck. 
 
 Capacity, cc 500 _1000 
 
 I^ach ~-^^ 2.75 
 
 28272. Flask, filtering, with side tubuiation and funnel shaped neck into which the filtering funnel may be 
 
 tightly fitted by means of a heavy rubber ring. Price does not include glass funnel or rubber 
 
 Capacity of flask, cc 500 1000 2000 
 
 Each ■6** 1-™ 1-50 
 
 28273. Rubber Rings, each ^ -IS 
 
 28276. Flasks, Kjeldahl, Whitall-Tatum, Nonsol Glass, very insoluble in water, alkalis and acids. Specially 
 
 recommended for uniformity of shape. By special arrangement with the manufacturer we are 
 enabled to offer these Flasks for immediate shipment from our stock at original net factory 
 
 SpSty,cc 500 800 
 
 Height, mm 300 280 
 
 Diameter of body, mm \m__ 110 
 
 Each 3" .'^ 
 
No. 2S.i2S No. 38332 No. 28.33*; 
 
 28280. 
 28284. 
 28288. 
 28292. 
 
 28300. 
 28302. 
 28304. 
 
 28.308. 
 28310. 
 28312. 
 
 28316. 
 
 28320. 
 
 28324. 
 28328. 
 28332. 
 28336. 
 
 300 
 .22 
 
 .300 
 
 300 
 
 500 
 .30 
 
 .800 1000 
 .35 .45 
 
 00 
 
 .soo 
 
 1000 
 
 1500 
 
 2000 
 
 30 
 
 .3.5 
 
 .45 
 
 .55 
 
 .63 
 
 00 
 
 800 
 .40 
 
 1000 
 
 1500 
 
 2000 
 
 33 
 
 .50 
 
 .63 
 
 .70 
 
 300 500 
 
 Flasks, Kjeldahl, New Jena Glass, round bottom, short neck. 
 
 Capacily, lc 50 100 200 
 
 Each 13 -14 .18 
 
 Flasks, Kjeldahl, New Jena Glass, flat bottom, short neck. 
 
 Capacitv, ..■(■ _50 100 200 
 
 Each, 13 .14 .18 
 
 Flasks, Kjeldahl, New Jena Glass, round bottom, long neck. 
 
 Capacilv, CI- 50 100_ 200 
 
 Each... 14 .15 .20 
 
 Flasks, Kjeldahl, New Jena Glass, flat bottom, long neck. 
 
 Capacity, cc 50 100 200 
 
 Each 14 .15 .20 .25 .33 
 
 Flasks, Vacuum, Dewar, tube form, for liquid air, without base and unsilvered 
 
 Length outside, mm 
 
 Outside diameter, mm 
 
 Inside diameter, mm 
 
 Each, , . ." 
 
 Flasks, Vacuum, as above, but silvered 
 
 Support for either of above 
 
 Flasks, Vacuum, Dewar, pear shaped, for liquid air, unsilvered. 
 
 Capacity, cc 
 
 Each.... 2.50 3.00 4.00 
 
 Flasks, Vacuum, as above, silvered 3.00 3.50 4.75 
 
 Support, only, for above flasks 1.00 1.00 1.50 
 
 Flask, Cassia, with graduated neck and glass stopper. Capacity 120 cc, neck graduated to 10 
 
 2000 
 .63 
 
 100 
 
 45 
 
 30 
 
 2.00 
 
 2.50 
 
 4.50 
 5.00 
 . .75 
 
 150 
 
 300 
 
 500 
 
 1000 
 6.50 
 7.25 
 1.50 
 
 ^ths. . 
 
 Flask, Volumetric, with graduations above and below bulb, for saponification method of determining 
 total fatty acid in cotton seed and similar products 1.50 
 
 Flask, Volumetric, for the determination of unsapon'fiable fats, capacity of lower bulb 100 cc, with 
 mark indicating 50 cc ; capacity of upper bulb 30 cc; with ground glass stopper and graduated to 
 contain _ _ 1.10 
 
 Flask, Volumetric, for insoluble phosphoric acid determinations, with wide neck 25 mm inside diameter, 
 capacity of flask 200 cc, of stout glass .40 
 
 Flask, Volumetric, for fertilizer work, 250 cc capacity, with short neck, of heavier glass than regular 
 volumetric flask and with mark low on neck 50 
 
 Flask, Volumetric, as used in the analysis of feed water for boilers, particularly in determining the 
 alkalinity, etc.; accurately graduated to deliver 58.3 cc 35 
 
 Flask, Volumetric, conical shape with enlarged mouth, 100 cc capacity. As used in oil analysis. . .75. 
 
ARTHUR H. THOMAS COMPANY 
 
 m 
 
 No. 28340 No- 2S3.l'l No. 28348 No. 28360 No. 2N364 No. 28368 
 
 28340. Flasks, Volumetric, without stoppers, graduated to contaiu. 
 
 Capacity, cc 10 25 50 1 00 200 250 300 .500 1000 2000 
 
 Each 15 .18 .20 .25 .30 .40 .45 .50" .t;5""T00 
 
 28-344. Flasks, Volumetric, with ground glass stopper; graduated to contain. 
 
 Capacity, cc _ 10 25 50 100 200 250 
 
 Each 20" .25 .30 .35 .45 .50 
 
 Capacity, cc 300^ 500_ 1000 2000 3000 6000 
 
 Each 55 .60 .80 1.20 2.00 4^ 
 
 28348. Flasks, Volumetric, with ground glass stopper; graduated to contain and to deliver. With two marks 
 on neck. 
 
 Capacity, cc 100 250 -jOO 1000 
 
 Each .50 70 .90 l.IO 
 
 28352. Flask, Volumetric, without graduation, for graduation by the user. Without stopper. 
 
 Capacity, cc 100 250 500 1000 
 
 Each 18 .28 .40 .50 
 
 28356. Flask, Volumetric, same as above, with glass stopper. 
 
 Capacit\, cc 100 250 500 1000 
 
 Each .30 40 ^.55' .70 
 
 28360. Flasks, Volumetric, with blue stripe on white enamel back, as in Schellbach burettes, making easy 
 the reading of a sharp meniscus; with ground glass stopper. Graduated to contain. 
 
 Capacity, cc 100 250 500 1000 
 
 Each 35 .50 ~" .65 .85 
 
 FLASKS, VOLUMETRIC, PRECISION, graduated by weighing at 20''C. in accordance with the specifications 
 of the Physikalisch-Technische Keichsanstalt, with individual control number. These flasks are offered 
 with our unofficial factory certificate and, in addition, with the Physikalisch-Technische Reichsanstalt 
 certificate and control stamp, i. e., the official certificate of the German government. 
 Precision Volumetric Flasks with Unofficial factory certificate 
 These certificates are made out in the factory in exact accordance with the methods used by the 
 Physikalisch-Technische Reichsanstalt and no flask is certified unless the error falls within the limit 
 permitted by the P. T. R. The data on these certificates may be used as a check where flasks are cali- 
 brated in the laboratory or with entire reliance upon the accuracy of the figures given. 
 2S364. Flasks, Volumetric, Precision, without stopper, adjusted to contain; with unofficial factory certificate 
 
 Capacity, cc _ 50 100_ _ 250 .500_ 100q_ 2000 
 
 Each 65 .70 LOO 1.25 1.50 2^30 
 
 28368. Flasks, Volumetric, Precision, with stopper, adjusted to contain, with unofficial factory certificate. 
 
 Capacity, cc 50 100 2 00 250 500 1000 2000 
 
 Each .80 .85 1.10 1.20 1.50 1.75 2.50 
 
 28372. Flasks, Volumetric, Precision, with stopper, adjusted for delivery, with unofficial factory certificate 
 
 Capacity, cc 100 250 500 mO_ _ 2000 
 
 Each 85 1.20 1.50 1.75 2.50 
 
 Precision Volumetric Flasks with Physikalisch-Technische Reichsanstalt Certificate 
 These flasks are exactly the same as those described above in workmanship and accuracy but are 
 furnished with the official Physikalisch-Technische Reichsanstalt certificate and control stamp, for 
 which a higher price must be charged because of the German government fee. 
 28376. Flasks, Volumetric, Precision, with stopper, adjusted to contain, with P. T. R. certificate. 
 
 Capacity, cc 100 250 500 1 00 2000 
 
 Each 2.00 2.65 3.15 3.75 5.25 
 
 28380. Flasks, Volumetric, Precision, with stopper, adjusted for deliverv, with P. T. R,. certificate. 
 
 Capacity, cc 100 " 2 50 500 1000 2000 
 
 Each 2.00 ' "~ 2^65 3.15 3.75 5.25 
 
ARTHUR H. THOMAS COMPANY 
 
 28384. 
 
 28388. 
 28392. 
 28396. 
 28400. 
 28404. 
 28408. 
 
 28412. 
 28416. 
 
 Flasks, Volumetric, New Jena Glass, without stoppers and without graduation. The indicated capac- 
 ity falls near the middle of the neck. 
 
 Capacity, cc 50 100 125 200 2,50 300_ 500 
 
 Each 17 -18 -19 ■-* -29 -33 .42 
 
 Flasks, Volumetric, New Jena Glass, same as No. 2S384 but with glass stoppers. 
 
 Capacity, cc 50 100 125 200 250 3 00 500 
 
 Each,...' 38 .39 .40 ,48 ..53 .58 .73 
 
 750 
 ,50 
 
 1000 
 ,55 
 
 2000 
 ,78 
 
 750 
 
 1000 
 
 2000 
 
 ,83 
 
 ,90 
 
 1,15 
 
 Flasks. Volumetric, New Jena Glass, without stoppers. Graduated to contain. 
 
 Capacity, cc 50 100 125 200 2.50 300 500 
 
 Each 50 ,53 ,55 ,60 ,70 ,75 .85 
 
 Flasks, Volumetric, New Jena Glass, same as No. 2.S392 but with glass stoppers. 
 
 125 
 
 250 
 
 750 
 
 i.bo 
 
 .500 
 1.16 
 
 1000 
 1.15 
 
 2000 
 1,40 
 
 1000 
 1,50 
 
 100 and 110 200 and 220 
 
 200.6 
 
 201.2 
 
 20L4 
 ,65 
 
 Capacity, cc. 
 
 Each tl 
 
 Flasks, Sugar, with two graduations and without stoppers. 
 
 Capacity, cc _ 50 and 3; 
 
 Each 28 
 
 Flasks, Sugar, Eohlrausch, with enlarged mouth. 
 
 Capacity, cc 100__ 200 
 
 Each -il , , ,^ -65 
 
 Flasks, Sugar, with dark blue enameled stripe on white enameled background. 
 
 Capacity, cc 50 and 55 lOO^and 110 200 an d 220 
 
 Each.'...! '. :. M ' -50 ,70 
 
 Flask, Sugar, Bates, 100 cc capacity, pear shape with flaring top ,60 
 
 Flasks, Volumetric, Stohmann, of heavy glass for shaking, graduated to contain, without stopper 
 
 Capacity.cc 250 500 1000 
 
 Each 60 .80 1.00 
 
 Flasks, Volumetric, Stohmann, as above, with glass stopper. 
 
 Capacity,cc 250 500 1000 
 
 Each 75 1.00 1,20 
 
 Flasks, Volumetric, Giles, with glass stopper and two graduations. When used for making nor- 
 mal solutions the 10% extra volume in the neck of the flask is used for ascertaining exact titra- 
 tion, leaving a volume equal to the exact capacity of flask, for correction. 
 
 Capacity, c5 500/50 1000/100 2000/200 
 
 Each 1.75 2,40 3150 
 
 Flasks, Watering, as used in the determination of water requirement of plants. This flask is of special 
 shape and of exactly 2000 cc capacity when filled even with the ground rim, there being no other 
 mark on the flask. This feature enables them to be quickly filled by total immersion and insures 
 delivery of the exact amount of water when placed in a vertical position over the pot, as illus- 
 trated in BiiUetin S84 of the U. S. Deparlmenl of Agriculture, Bureau of Plant Industry 1,50 
 
28432. 
 28436. 
 
 28440. 
 
 28460. 
 28464. 
 28468. 
 28472. 
 28476. 
 
 28480. 
 28484. 
 28488. 
 28492. 
 
 28496. 
 28500. 
 28.104. 
 28508. 
 28512. 
 
 Flask Heater, lie;iU'<l by eleutriu iiii;aiid(.'«i;cut hiuip, for conducting ether iiinl siiiiiliii- distillation.^ wilii- 
 out dangci-. On support, with connecting cord but without flask. Will accommodate a 1000 
 
 cc flask 4.00 
 
 Flask Heater, Electric, of copper, with convenient ring top. Diameter Sk inches, height 4 inches. 
 Furnished w ith three heats, regulating switch, 6 ft. of cord and switch for connecting. Requires 
 ,^00 watts. ^Yorks equally well on direct or alternating current but voltage must be specified 
 
 in ordering 12.00 
 
 Flask Heaters, of sheet iron, with ventilating openings and asbestos inset. 
 
 Diameter, mm 110 130 180 220 .270 
 
 Each ,60 .7.5 .90 1.10 1.25 
 
 Forceps, of brass, straight 15 
 
 " " " bent 
 
 " " " with ivory tips 
 
 " " " nickel plated, so-called Goosenecl 
 
 " " steel, plain. Length, mm 
 
 Each 
 
 Forceps, Blowpiping, French form, 5\ inches long, t 
 
 Forceps, Pinning regular stvlc 
 
 Blake " 
 
 Forceps, of steel nickel plated: For removing specimens from deep jars or bottles. 
 
 Length, mm 250 .300 
 
 Each 1.25 1.50 
 
 Forceps, Cover Glass, with flat, bent blades, 105 mm long 
 
 " with thin, straight blades and guide pin, 115 mm long 50 
 
 ■' •' " with thin, bent, flat blades; self-closing; 125 mm long 75 
 
 " " " Ehrlich, with long, flat blades and locking device; 135 mm hjng 1.25 
 
 Forceps, Cover Glass, Novy, with flat lower blade and curved, pointed upper lihidc. Nickel phded. 
 
 Will not c 
 
 rrode; 
 100 
 
 150 1 
 
 .10 
 
 .'ith heavy platinum tijis 
 
 .12 
 
 .18 
 . .70 
 . .50 
 
 150 
 
 .20 
 5.00 
 
 450 
 2.50 
 
28516. 
 28520. 
 28524. 
 28528. 
 28532. 
 28536. 
 28540. 
 28544 
 
 28552. 
 
 2S.55S. 
 
 28560. 
 28564. 
 
 28568. 
 28572. 
 
 .15 
 
 250 
 
 .18 
 300 
 1.35 
 
 Forceps, Cover Giass, Novy, same as No. 28512 but with locking dev 
 
 " " " Cornet, of spring brass, nickel plated, self-closing, 120 mm Ion] 
 
 " " " and Slide, with weight to increase stability 
 
 " " " Stewart, original form, of nickeled spring wire, self-closing 10 
 
 " " " " same as No. 28528 but with ring to hold jaws together 08 
 
 Slide, Kirkbride 10 
 
 " Boston 25 
 
 Funnels, Glass, with angle of 00° and stem ground to point. 
 
 Diameter, mm _25 40 50 6.3 75 90 100 
 
 Each 07 m ^9" .10 .12 
 
 Diameter, mm nO 150 170 200 225 
 
 Each 20 .30 .35 .50 .65 .90 
 
 Funnels, Glass, Bunsen, with an exact angle of 60° and with long, thin stems (sizes up to 100 mm 
 diameter have stems about 100 mm long) ground to point and with ground rim. This is an accu- 
 rate funnel and is not to be confused with the ordmary funnel which we list under No. 28544. 
 
 Diameter, mm 25 40 50 _65_ 75 90 100 110 120 150 
 
 Each 10 .10 .12" il5 .16 .TS .2: 
 
 Funnels, Glass, Special, exactly as above but with extra long, thin stems. 
 
 Diameter, mm 50 65 75 
 
 Each ^.15 .18 ^0" 
 
 Funnel, Glass, exactly as above but with capillary bore for perfect suction. 
 
 Diameter, mm 50 65 75 90 
 
 Each 15 .18 ' .20 .25 
 
 Funnels, without stem, as used in sugar analysis. Diameter, mm 70 90 
 
 Each 15 .20 
 
 Funnels, Glass, with short, wide stem; so-called powder funnels. 
 
 Diameter, mm 60 SO 
 
 Diameter of stem, mm 14 16 
 
 Each 20 .25 
 
 .25 .30 
 
 .40 
 
 90 
 
 100 
 
 .25 
 
 .30 
 
 Funnels, Glass, with bulb, for filtering through glass wool. 
 
 Each 
 
 Funnels, Victor-Meyer, to suspend over evaporating dishes 
 
 Each 
 
 Diameter, mm 100 
 
 30 
 
 160 200 
 1.00 
 
 .45 
 
 260 
 
 1.20 1.60 
 
28576. Funnels. Ribbed, for quick filtering. 
 
 Diameter, inches. 2^ 3f "41 "5^ 7i 8J 10} 13_ 
 
 Each .10 .12 .15 TlS l25 .40 .75 1.50 
 
 28580. Funnels, Glass, with diagonal fluting, for very rapid filtering. Particulary recommended for use 
 
 with our special filter paper No. 27920 in filtering agar agar for culture media. 
 
 Diameter, mm _70 _ 100 IGO 200 240 
 
 Each 25 .50 70 1.45 2.25 
 
 25582. Funnel for use with Morochowetz dialyzing filters, with very accurate angle 12''-15°, and 250 mm high .75 
 28584. Funnels, Vogel, with side tubulatioii for suction. Diameter, mm 80 90_ 105 
 
 Each ^75 ~~90~ 1.00 
 
 28588. Funnels, Double Walled, for either hot or cold filtrations, with inlet and outlet tube, 100 mm in 
 
 diameter 3.00 
 
 28592. Funnels, Double Walled, with exhaust and silvered lid, 100 mm in diameter 6.50 
 
 28596. Funnels, set of three for delivering minute quantities; J, 1 and l\ inch in diameter. Per set .25 
 
 28600. Funnels, Copper, with ribs, 4 inches in diameter. Without stem 75 
 
 28604. Funnels, Aseptic Enamel Ware. Of seamless steel, white enameled, both acid and fire proof. With 
 
 handle. Diameter, inches 3 4^ 6 8 
 
 Each ^5 " ~ .50 .75 1.00 
 
 28608- Funnels, Porcelain, with perforated sides, 160 mm in diameter - . 1.20 
 
 28612. " " small size, for use as filter cones. Diameter, mm 45 _ 0.5 
 
 Each 25 .35 
 
 28616. Funnels, Porcelain, Euchner, with fixed perforated, porcelain plate. 
 
 Diameter, mm 50 65 80 100 125 150 200 
 
 Each.. 
 
 55 .70 .85 1.00 
 
 Funnels, Royal Berlin Porcelain, Buchner, with fixed, perforated plate, 
 funnel is distinctly superior to No. 28616 in that funnels of the sa 
 of perforations of 1 mm diameter in the piate. 
 
 Diameter of funnel, mm ">9 
 
 Each ^90 
 
 Funnels, Royal Berlin Porcelain, Hirsch, with fixed, perforated porcelain plate. 
 
 Diameter of funnel, mm 50 75 92 103 120 
 
 Diameter of plate, mm 36 44 57 59 59 
 
 Diameter of holes, mm 1 _ 1_ 1 H 'i 
 
 Each .60 " ~75~ ^0 ^OO 
 
 Funnels, Hard Rubber, with corrugatei 
 freely. 
 
 Capacity 
 
 Each .35 
 
 1.35 1.70 2.05 
 
 While more expensive, this 
 ; size have an equal number 
 
 1.50 
 
 112 
 
 100 
 
 2.10 
 
 4.20 
 
 140 
 
 163 
 
 59 
 
 112 
 
 ^ 
 
 H 
 
 2.10 
 
 2.70 
 
 1.50 
 
 pout which allows the air to escape so that the liquid flows 
 
 pt. i pt. I pt. 1 qt. 
 
 45 M ^ 
 
ARTHUR H. THOMAS COMPANY 
 
 28fi32. Funnel, Hot Water, nf lii';i\>-, |iuii.->licd copper, duublc wall, on three iron legs. Much superior to the 
 oriiinar\' article made without inside wall of copper. Including a glass funnel No. 28544, 150 
 iiiin diameter 6.00 
 
 28636. Funnel, Hot Water, double walled, with constant water level, Bunsen ring burner, clamp, stopcock and 
 glass funnel, 150 mm diameter, but without support 7.50 
 
 28640. Funnel, Hot Water, same as No. 2S636, but w-ith support 8.15 
 
 28644. " " " for electric heating, particularly recommended for filtration of culture _ media. 
 
 Of copper, with constant water level and stand and connection cord and plug for electric light 
 socket. Voltage must be stated in ordering. Including a glass funnel, 150 mm diameter. . 16.00 
 
 28648. Funnel, Hot Air, Lothar Meyer, of copper, double w-alled, \\'ith ring burner, support and a funnel, 
 1:^11 mui dial. iclcf 10.00 
 
 28652. 
 28656. 
 28660. 
 28664. 
 
 Funnel, Hot Water, of tin, with double wall 2.50 
 
 same as No. 28652 but of copper throughout 
 
 Funnel, Hot Water or Steam, consisting of a lead coil and one glass funnel, 170 mm diameter. 
 
 Funnels, Separatory, of heavy glass, with glass stopper. 
 
 Capacity, cc ^250 500 lOOU L'OOn 
 
 Each 2.00 2.25 2.50 3.00 
 
 4.50 
 i.50 
 
 4000 
 4.00 
 
 Funnels, Separatory, of heavy glass, with angle 60° and stem ground to point. 
 
 Diameter, mm ". 100 150 ISO 200 _240 
 
 Each 1.50 2.25 2^50 3^00 3.75 
 
 Funnel Separatory, (Terrapin Separator), as used in the U. S. Department of Agriculture, Bureau of 
 (.'hcmistry, for the handling of emiscible liquids which separate with difficulty because of their 
 tendency to form emulsions; 200 cc capacity, with ground in stopper and stopcock 3.00 
 
2S676. 
 28680. 
 28684. 
 28688. 
 
 28712. 
 287Ifi. 
 
 28720. 
 28724. 
 
 28728. 
 28732. 
 ^28736. 
 
 Funnels. Separatory, bell shape, with open top. 
 
 Capacity, cc 25 oO 75 100 
 
 Each 80 I.OO 1.10 1.25 
 
 Funnels, Separatory, cylindrical, with i.ipen top. 
 
 Capacity, cc 30 _ 50 100 loO 200 250 
 
 Each ;90 ~i:00 LIO 1.35 1..50 1.75 
 
 Funnels, Separatory, cylindrical, with ground glass stopper. 
 
 Capacity, cc 30 50 100 150 200 250 
 
 Each I J5~' nr.25~ 1.3:i 1.50 1.75 2.00 
 
 Funnel, Separatory, cylindrical, with ground glass stopper and short stem, of stout glass. 
 
 Capacity, cc 500 _ j.q00 
 
 Each 2.50 " 3.25 
 
 Funnel, Separatory, cylindrical, with ground glass stopper and short stem, exactly like No. 2S6S8but 
 graduated. 
 
 Capacity, cc 500 1000 
 
 Each 4.00 5.00 
 
 Funnel, Separatory, cylindrical, graduated, with glass stopper and air vent. 
 
 Capacity, cc 100 250 
 
 Each 2.00 XOO 
 
 Funnels, Separatory, pear shape, with ground glass stopper. 
 
 Capacity, cc 30 60 125 250 _ 500 1000 2000 
 
 Each 1.00 1.10 1.20 1.50 2.00 3.40 " 5.00 
 
 Funnels. Separatory, same as No. 28700 but with air vent in stopper. 
 
 Capacity, cc 125 250 500 1000 2000 
 
 Each 1.50 2.00 2.50 3.90 5.50 
 
 Funnel, Separatory, for ether separation in nickel determinations. The outlet stem is moderately 
 long and of small caliber so as to hold a column. Specially designed for use in iron and steel 
 laboratories. Capacity, 160 cc 1.75 
 
 Funnel, Separatory, for nickel determinations, as described in Blair's "Analysis of Iron and Steel," 7th 
 Kd., p. 191 3.00 
 
 Funnels, Separatory, Squibb, with ground glass stopper. 
 
 Capacity, cc 125 250 500 
 
 Each 1.50 " 1.80 2.40 
 
 Funnel, Separatory, for sulphonation test of creosote, as used in the Forest Service of the U. S. Depart- 
 ment of Agriculture. With graduated tube above the bulb. Capacity 125 cc 3.00 
 
 Funnel, Separatory, LaWall, for preventing the formation of emulsions in shaking out with im- 
 miscible solvents. See Journal of American Pharmaceutical Association, April, 1914, p. ^98, 
 The liquid to be extracted is placed in one bulb, with sufficient water to completely fill 
 the bulb and the immiscible solvent is placed in the second bulb. By inclining the apparatus, 
 with the lighter of the two solvents in the lower bulb, extraction is easily accomplished by the 
 passing of the liquids through the construction between the bulbs. Recommended for use in 
 the assay process for alkaloidal fluid extracts. 
 
 Capacity of bulbs, cc 25^ ^50 100 
 
 Each 1.50 1.60 1.75 
 
 Funnel, Straus, for estimating lactic acid in gastric juice; with glass stopcock 1.25 
 
 Funnel, Dropping, Walter, for examining single drops. Capacity, 60 cc 1.50 
 
 Funnel Attachment, for use in filling test tubes, flasks, etc. It prevents contact of fluid with the 
 surface of vessel being filled so that the latter remains clean for the insertion of cotton plug. 
 Including rubber tubing and pinchcock .50 
 
0?0¥ 
 
 250 
 
 28740 2K744 2874S 28752 28756 287G0 28764 
 
 28740. Funnel Tubes, straight, with'conical top. Length, mm 200 
 
 Each .10 
 
 28744. Funnel Tubes, straight, with thistle top. Length, mm 200 
 
 Each 07 .08 
 
 28748. Funnel Tubes, with loop and conical top. Length, mm 200 
 
 Each 16 
 
 28752. Funnel Tubes, with loop and thistle top. Length, mm 200 
 
 Each 15 
 
 28756. Funnel Tube, with loop, one bulb aud conical top. Length 300 mm 
 
 28760. " " same as No. 28756 but with thistle top 
 
 28764. " " with double loop and one bulb on each side. With thistle top; length 300 mm.. 
 
 28768. " " same as No. 23764 but with bulbs near top and with short stem 
 
 28772. Funnel Support, for holding funnels on beaker. Diameter, mm ., . 65 80 100 
 
 Each .20 .25" .35" 
 
 28776. Funnel Support, Ostwald, of brass wire, for one funnel 
 
 28780. " " as above, but adjustable in height from 15 to 24 cm 
 
 .12 
 300 
 .10 
 
 300 
 .20 
 300 
 .16 
 
 400 
 
 .12 
 
 400 
 
 .25 
 
 400 
 
 .20 
 
 . .25 
 
 . .25 
 
 . .25 
 
 . .25 
 
 120 
 
 .40 
 
 .30 
 
 1.00 
 
 ,. 28784 N«. 28788 No. 25792 No. 2S79B No. 28800 
 
 Funnel Support, of wood, for one funnel .90 1 
 
 " .50 I 
 
 " " *' " " two funnels, one on each side 75 
 
 " " " " " " " both on one side .70 
 
 " " " " " four funnels, two on each side .90 
 
 
 No. 2saoi 
 28804. Funnel Support, of wood, improved pattern. For, funnels 6^ _12 
 
 Each 2.75 4^ 
 
 28808. " Support, Schultz, of brass, nickel plated, adjustable in length from 40 cm to 120 cm and 
 
 adaptable to from 1 to 20 simultaneous filtratioas; with 12 triangular funnel supports 15.00 
 
ARTHUR 
 
 THOMAS COMPANY 
 
 
 I bi\ fuiiuela 111 uue luw Witli slutted hul a 
 tweUo fuQaels bi\ in each row with slottei hok-^ 
 Funnel Support, Leach, for separatory funnels 
 
 " " for four funnels jf rut 1 \Mth metal clamp far attai^hin^ to suppoit 
 
 Funnel Support, revolving form i ^ci\ n\' ' lent nevi- modi 1 
 
 n Showing Arrangemenl of Samples 
 
28900. 
 28904. 
 
 28908. 
 
 28912. 
 
 28916. 
 
 28920. 
 
 s 1 No. 2891G 
 
 Furnace, Fletcher Crucible No. 15, for operation without blast. Takes crucibles up to 4 x Si inclies. 
 For operation with either illuminating gas, natural gas or gasoline gas. Requires i inch diame- 
 ter gas feed pipe. Price includes 6 ft. oi pipe, a No. 3 clay crucible, clay cylinder and tongs 16.00 
 
 Furnace, Fletcher Crucible No. 40, for illuminating gas only. Requires blast from foot blower such 
 as No. 21968 and -g- inch gas supply pipe. Takes No. 00 clay crucible. Complete with one 
 No. 00 crucible, but without foot blower 3.50 
 
 Furnace, Fletcher Crucible No. 40a, Injector. For use with illuminating gas, natural gas or gasoline 
 gas. Requires f inch supply pipe and takes a No. 00 clay crucible. May be used with foot 
 blower No. 2196S and, where regular gas supply is not available, with gasoline gas generator 
 Complete with one No. 00 clay crucible, but without foot blower 4.00 
 
 Furnace, Fletcher Crucible Kerosene Blast No. 40B, for use with refined petroleum or kerosene oil. 
 ]?oquiros foot blower No. 21968 and takes No. 00 clay crucible. Complete with one No. 00 
 clay cnH^ible but without foot blower 5.50 
 
 Furnace, Fletcher Crucible Kerosene Blast No. 41E, similar to No. 28912 but larger. Complete with 
 one \n. I clay crucible and two burners, but without foot blower 10.50 
 
 Furnace, Fletcher Crucible Kerosene Blast, similar to No. 28916 but larger. Complete with one 
 nnd three burners, but without foot blower 13.00 
 
 2.'^924. Furnace, Fletcher Combined Muffle and Crucible No. 
 
 141, for use with illuminating gas, natural gas or 
 
 gasoline gas. Requires foot blower No. 21968 
 
 ^ "fki^^B if'"'^ ^'^'-^ ■'- '^^^^^ '^ore supply pipe. Takes a No. 3 
 
 I ri'iiHBB I |f ^i > ^ crucible or a muffle 3* x 21 x &i inches, or, when 
 
 flNl fl'liiBt > "^^^"^ '^^ ^ crucible furnace only, takes a No. 6 
 
 -^—-~ -■ crucible. Complete with muffle and one No. 3 
 
 'iJ^^-^^^ Nt ^^ clay crucible, but without fnot hlowor .... 11.00 
 
ARTHUR 
 
 THOMAS 
 
 COMPANY 
 
 No. 28836-40 
 
 Furnace Fletcher Muffle, foi exact temperatures oot exccediag that of the fusing point of copper. 
 F r e ith illurain.itiQg gas, natural gas or gasoline gas. Complete with mufHe, dome, cru- 
 cible tongs and 6 ft. of pipe. 
 ^' ' 3 
 
 28932. 
 28936. 
 
 101 X 9. ^ ss 
 1 
 
 22.00 35.00 45.00 
 
 1.25 1.50 2.50 
 
 "Manual of Assaying Gold, Silver, Copper 
 natural gas or gasoline gas. Consists of 
 
 Number. . 
 
 MufHe space, inches .'jj x .5'; x -ji- 7'. \ 6^ x oj- 81 x 71 x ii] 
 
 Bore of gas pipe, inches . \ 
 
 Each ~ 17.00 
 
 Extra Domes or Muffles, each 1.00 
 
 Furnace, Assayer's Combination, Brown, fully described i 
 and Lead Ores." For use with illuminating gas, 
 
 three furnaces; the one on the left for roasting sulphurets, the center one for crucible fusions, 
 taking a plumbago crucible 4 inches high by 35 inches in diameter, and the one on the right for 
 scorification and cupellation. Complete with plumbago fittings, chimney pipe, horizontal gas 
 pipe and three | inch taps, as illustrated, but without vertical gas pipe, fire-brick covered bench 
 
 or rubber tubing 57.00 
 
 Fire-Brick Covered Bench, extra 32.00 
 
 28944. Furnace, Wiesnegg Muffle, original 
 French make, for incinera- 
 tion. As supplied by us to 
 the Food Laboratories of the 
 U. S. Department of Agri- —.=^ 
 
 culture, etc. Muffle dimen- 
 sions 115 X 70 X 16-5 mm. 
 Complete with muffle and 5 
 
 gas burners 16.00 
 
 2S94fi. Extra Muffles, each... .75 
 
 28952. Combustion Furnace, Fletcher, for 
 ordinary gasoline or natural 
 gas. For high temperatures 
 it should be used with Foot 
 Blower No. 21952 or other 
 form of blast. 
 Length of furnace, inches 
 
 12 18 2 4 
 
 Each. 12.00 16.00 20.00 
 
 28956. Extra Fire-Clay Tiles, 6 inches 
 
 M long, for use with Furnace 
 
 ^^ No. 28952. Each 50 
 
ARTIILR H. THOMAS COMPANY 
 
 ^ 
 
 28960. Combustion Furnace, von Babo-Erlenmeyer, a widely used and satisfactory model. With Bunsen 
 burners with both stopcock and air regulator. 
 
 Number of burners 10 1.5 20 25 
 
 Length of heating surface, cm 25 35 45 60 
 
 Each 20^0 ~ 25.00 30.00 38.00 
 
 28964. Combustion Furnace, Glaser, with burners of the Finkener type with stopcock and air regulator. 
 Burner system is adjustable both vertically and horizontally and, by a special arrangement of 
 the tiles and burners, a uniformly long surface is heated by each burner so that only 20 burners 
 are required to heat an 80 cm surface. 
 
 Number of burners 10 15 20 
 
 Length of heating surface, cm 38 56 80 
 
 Each 35.00" 40.00 50^ 
 
 28968. Extra .Side Tiles for Furnace No. 28964. Each 25 
 
 28972. " Top " " " " 28964. Each ' " " ,35 
 
 28976. " Clay Gutters for Furnace No. 28964. Each 20 
 
 289S0. Furnace, Freas Tube, with electric heating and control. Recommended as a safeguard against untimely 
 explosions so frequent with gas heated furnaces, due to fJuctuating gas pressure, etc. The front 
 of the furnace is fitted with a cast iron frame with four iron tubes 25 inches long and 1-^ inches 
 in diameter, set in and properly supported. The iron frame is also provided with a heavy metal 
 hood to prevent contents of the tubes causing personal injury in case of an explosion. The 
 indicator of the furnace is graduated for temperatures up to 200" C, but can be furnished for 
 other temperatures when desired 85.00 
 
 28984. Furnace, Explosion, Carius, for five 20-inch tubes. Tubes may be used up to 1^ inches outside 
 diameter 15.00 
 
ARTHUR H. THOMAS COMPANY 
 
 28992. 
 28996. 
 29000. 
 29004. 
 29008. 
 
 29010. 
 29012. 
 29016. 
 29020. 
 
 29024. 
 29028. 
 
 No. 29020 No. 28938 
 
 Combustion Furnace, Hoskins Electric, Type FA, for temperatures up to 1000° C. Operates on 110 or 220 
 volts, A. G. or D. C. Life of heating element about 1000 hours if operating tenaperature is kept 
 down to 1000°C. or below by means of rheostat- Immediate renewals can be made by the user with 
 repair parts we supply at prices below. Voltage must be specified in ordering. Widely used for the 
 determination of carbon in steel by the combustion method as in the Vanier Train, p. 150. 
 Heating compartment is 12 inches long x 1^ inches in diameter. These furnaces should always 
 be used with Rheostat for exact temperature control and to avoid burning out. Without 
 rheostat 25.00 
 
 Combustion Furnace, as above, but with rheostat 33.00 
 
 Alundum Tube, only 2.10 
 
 Heating Unit 2.00 
 
 Alundum Tube Wound with Nickel Chromium wire 7.00 
 
 Combustion Furnace, Hoskins Electric, Type FB, for A. C. only. Operates on low voltages, from 10 to 50, 
 which are most satisfactorily obtained by stepping down alternating currents by means of a trans- 
 former. Regularly supplied for use on 110, 220 or 440 volts, 25 or 60 cycle lines. Maximum work- 
 ing temperature 1100° C. at which the life of the furnace is about 1000 hours. Specially designed 
 for continuous operation. Power consumption 1000 watts. Heating chamber is 11 inches long by 
 1 inch in diameter. Voltage and number of cycles must be specified in ordering. Without rheo- 
 stat or transformer 30.00 
 
 Combustion Furnace, as above, but with rheostat and transformer for 60 cycle, A. C 55.00 
 
 " 25 " " 65.00 
 
 Extra heating unit 4.10 
 
 Temperature Regulator and Recorder for Electric Furnaces, Thwing; automatically controls the tem- 
 perature of electric furnaces and records the temperature every minute (or oftener, if desired) 
 proving the efficiency of control and supplying an absolute record as to the temperature at which 
 the work is done. Adapted to any type of electric furnace. Circuit made and broken by relay 
 switch, there being no contacts made or broken in the instrument. Control outfit also built for 
 Thwing or other indicating pyrometers. Recorder and Controller, without thermocouple, 
 
 (which must be selected for the range desired) or furnace as shown in illustration 165.00 
 
 Indicator and Controller, only 115.00 
 
 Controller only 75.06 
 
 237 
 
Combustion Furnace, Heraeus. Type A. Wininil with platinum ribbon for ;i in;iximum temperature of 
 1400° C. The inside diameter of the tube is 20 mm. Voltage must be specified in ordering. 
 Prices include platinum. Length of heating tube, cm 22 44 60 
 
 29032. Furnace only, without rheostat ~47T50 63.00 72.50 
 
 29033. " with rheostat for 110 volts 61.50 85.00 98.10 
 
 290.34. •' " " "220 " 85.00 98.10 
 
 Combustion Furnace, Heraeus, Type B, exactly same as No. 29032 but with tube 30 mm inside diameter 
 
 and niaxiniuni temperature of 1350° C. Length of heating tube, cm.. 20 30 40 60 
 
 290.36. Furnace only, without rheostat .57.00 69.00 78.50 90.50 
 
 29037. " with rheostat for 1 10 volts 72.00 91.00 104.10 124.50 
 
 29038. " •' ■' "220 " 91.00 104.10 124.50 
 
 Combustion Furnace, Heraeus, for Reactions in Vacuum or in Gases other than Air. This is a platinum 
 
 wound furnace of the same type as No. 29032 and No. 290.36 but with larger internal chamber 
 so that a special tube with closed end may be inserted. One end of the tube is provided with 
 connections for the thermo-couple of a pyrometer and the other end with a mica observation 
 window and inlet and outlet tubes for the gases. Tubes can be used of Royal Berlin porcelain, 
 glazed inside and outside, opaque fused silica or Marquardt mass. For temperatures under 
 1000° C. the Royal Berlin glazed porcelain tubes are recommended as being more likely to be 
 entirely gas tight.We guarantee none of the tubes to be absolutely gas tight under all conditions. 
 With silica or Marquardt tubes a temperature of 1300° C. can be obtained. Prices include a 
 suitable tube of Royal Berlin porcelain with the end fittings as shown in illustration but do 
 not include pyrometer or thermo-couple. Inside diameter of the tube is 1^ inches. 
 Length of heatings surface, cm 30 60 
 
 29040. Furnace, without rheostat 93.25 142.50 
 
 29041. " with 110 volt rheostat 127.25 185.00 
 
 29042. " " 220 " " 127.25 185.00 
 
 29044. Combustion Furnace, Heraeus, for Organic Analysis. Consists of two mutually independent fur- 
 naces mounted on wheels which operate on top of a supporting frame. A grooved metal trough 
 extends through both furnaces and carries a combustion tube which should be about 90 cm in 
 length . Each furnace is provided with a separate rheostat. The larger furnace is 35 cm in length 
 and will cover a charge of copper oxide about 25 cm long. Prices include platinum. 
 
 Voltage 110 ^20_ 
 
 Each 135.00 124.50 
 
 238 
 
ARTHUR 
 
 THOMAS COMPANY 
 
 2904S. Combustion Furnace, Heraeus-Dennstedt, for elementary organic analysis. See Zeitschrift fur ange- 
 waitdle (Jhemit 1905, 18, IIS4. For 110 volts the furnace takes about 16 grams of platinum and 
 the 220 volt takes about S grams. This is not included in the price and is addedto the cost of 
 the furnace at market price. The glassware and suisports constituting the train after Denn- 
 stedt are not included in the price nor is the combustion tube. Furnace only, for either 110 or 
 220 volts, Duty Free 82.50 
 
 29052. Complete Set of Glass Parts, rahi;ipr innnections and supports for ;i!iovr. outfit to be arranged as 
 shown in illustration. Duty Free 27.00 
 
 Furnace, Electric, Hoskins Crucible Type FA, for operation between a minimum of 316° C and a maxi- 
 mum of 1000° C, for citiifr 110 or 220 volts alternating or direct current. Life of the heating 
 element of nickel chromium al>out 1000 hours if operating temperature is kept at maximum or 
 below by moans of ilift.sUil wliioh should always be used in connection with the furnace for 
 safety as to luini mils :iiid acuurate control. Power consumption of No. 101 is 450 Watts and of 
 No. 103 is 1001) \\":tit.^, \"ollfl^;o must be specified in ordering. 
 
 Numbor ~ ' 
 
 Intcnud dimensions of chamber, inches 
 
 290.5li. Furnace only 
 
 29057. Furnace with rheostat 
 
 Alundum Core only. . 
 
 Heating Unit 
 
 Core wound with wire , 
 
 Furnace, Electric, Hoskins Crucible Type FB. fnr alhrnaiiii^ rr 
 mum of 1100° C continuously with great i'|'oiio?li>- of mrr 
 ages, i. e. 10 to 55, varying with the size of the- I'urnarr -nul 
 by stepping down by means of a special tran.sfuriiicr. \"i 
 specified in ordering. 
 
 Number 
 
 Inside dimensions of chamber, inches , , , . 
 
 29060. Furnace only 
 
 29061. Furnace with Rheostat and Transformer, 60 cycles 
 
 29062. Furnace with Rheostat and Transformer, 25 cycles 
 
 Extra Heating Units 
 
 Note Regarding Use of Hoskins Type FA Furnace; 
 All Hoskins Typo FA Furnaces are wound so that when 
 or 220 volts alternating or direct) which is always stamped '■i-i f V 
 mum safe wnrkiiiy; li'inpcrature of lS32°For 1000° Gin :i|.|>i ■ -i 
 and Crucible Furnaees require approximately 40 minuti 1 
 
 naces are loft on Ihe full line voltage after they have cfa'-inil i-.>- > im iiiuperaiure wiil eonunuc 
 to increase and the resistance element will consequently burn out in a short time. To guard against 
 this, a rheostat should always be connected in series with the furnace, and after the furnace has reached 
 the desired working temperature the rheostat handle should be turned back part of the way toward 
 the starting position. The proper point at which to set the rheostat handle in order to maintain any 
 desired temperature may readily be determined by trial. Where the furnace is frequently operated 
 at the same temperature it is convenient to make a mark on the rheostat at the proper point for main- 
 taining this temperature, and after furnace has reached the proper temperature the rheostat handle 
 can be set at the mark and left (here, thus insurinsr that the proper temperature will not be exceeded. 
 
 FA 101 
 
 F.4 103 
 
 FA 104 
 
 L' \- L'.i 
 
 4x4 
 
 0x3 
 
 18.00 
 
 40.00 
 
 60.00 
 
 23.00 
 
 48.00 
 
 70.00 
 
 1.00 
 
 2.00 
 
 4.00 
 
 1.00 
 
 2.00 
 
 3.00 
 
 4.00 
 
 8.00 
 
 13.00 
 
 \-. 'I'll. 
 
 '?'-!:^''"!u 
 
 nil luW Volt- 
 
 iil\- obtained 
 
 tage aii.l i 
 
 Ultll.T „( (■) 
 
 (.■les must be 
 
 FB 101 
 
 FB 102 
 
 FB 105 
 
 1* X U 
 
 2x2} 
 
 4x6 
 
 18.00 
 
 20.00 
 
 60.00 
 
 41.00 
 
 45.00 
 
 109.00 
 
 .31.00 
 
 3.5.00 
 
 122.50 
 
 3.00 
 
 4.00 
 
 8.00 
 
 jrnaces 
 
 
 
 noctc.l 1. 
 
 ll». |,n,,.er 
 
 vnbasc illO 
 
 .■mn' ];!■ tc 
 
 lhr\- ^vill lY 
 
 irh the llla\i- 
 
 . 1 1 
 
 .in- Tlir'l 
 
 If Il.,>r. fur- 
 
No. 2M0CB— Rear Vitw of Type FB202 No. 2906S— FB2US 
 
 Furnace, Electric, Hoskins Muffle Type FA, general specificatimis the same as above with (he exception 
 of shape. FA 201 consumes 11(10 Watts and FA 204 consumes 41.j0 Watts. Voltage must be 
 specified in ordering. 
 
 Number FA 201 FA 202 FA 203 FA 204 
 
 Inside dimensions of chamber, inclios. , . 3^ x 2^ x 5 4^ x 3 x S 5r x 3| x_9^ 7^ x 5\ x U 
 
 29064. Furnace only 35.00 50.00 GS-OO" 80.00 
 
 290G.i. Furnace with rheostat 43.00 60.00 85.00 110.00 
 
 .\lundum Muffle only 2..50 4.00 .>.00 7.00 
 
 Heating Unit 2.50 4.00 6.00 10.50 
 
 Muffle wound with wire 9.00 13.50 18.00 28.00 
 
 Furnace, Electric, Hoskins Muffle Tjpe FB, operating within the same limits as Type FB Crucible 
 Furnaces above. The control on the small size FB 202 is by means of rheostat with transformer 
 but in all of the larger sizes is accomplished by means of regulating transformer only. Furnaces 
 FB 20G and FB 207 are furnished on wire stand as shown in illustration. 
 
 Number FB 202 FB 204 FB 206 FB 207 
 
 Inside dimensions of chamber, inches. ... 4^ x 3 x 9 7| x 5 x 12j 12 x S x 19 12 x 8 x 26 
 Number of Heating Units 10 J0_ 14 14 
 
 29065. Furnace only 60.00 95.00 " 250.00 300.00 
 
 29069. Furnace with Rheostat and Transformer, 60 
 
 cycles 116.00 190.00 422.00 486.00 
 
 29070. Furnace with Rheostat and Transformer, 25 
 
 cycles 132.50 210.00 481.00 554.00 
 
 Heating Units, each I.OO 2.00 3.00 4.00 
 
 Note Regarding Use of Hoskins Type FB Furnaces 
 Hoskins Type FB Furnaces which are operated in connection with rheostat control, i. e., Type FB 
 101, 102, 105, 202 and 301 are controlled in the same manner as Type FA Furnaces, the use of the trans- 
 former with the above mentioned Type FB Furnaces being simply for the purpose of stepping 
 down the line voltage to the proper pressure for these furnaces. 
 
ARTHUR H. THOMAS COMPANY 
 
 4r L 1*1 /x 
 
 Furnace, Electric Arc, Moissan Type, new model for experimenta! work. Current consumption 100 
 amperes at 50-60 volts. Accommodates a crucible 50 mm high by 45 mm diameter or a dish 
 35 mm high by 28 ram diameter. Without cables. 
 Duty Free 49.50 Duty Paid 65.00 
 
 ircd 
 
 Dulj Free 
 11.40 
 
 2.85 
 .45 
 .27 
 .30 
 .60 
 .27 
 .27 
 
 Duly Frea 
 11.40 
 2.85 
 4.50 
 .35 
 .45 
 .95 
 .60 
 
 Dutr Paid 
 15.00 
 3.75 
 .60 
 .35 
 .40 
 .80 
 .35 
 .35 
 .75 
 with 
 
 Dutj Paid 
 15.00 
 3.75 
 
 .60 
 1.25 
 
 Accessories 
 1 pair Cables, 150 cm long, with connectiooa 
 
 Extra per meter per pair when cables longer than above are r 
 
 Carbon Electrodes, 350 x 22 mm, per pair 
 
 Carbon Crucible with depression for electrodes 
 
 Magnesite Crucible 
 
 Magnesia Crucible 
 
 Carbon Dish 
 
 Magnesite Dish 
 
 Magnesia Dish .60 
 
 Note — Duty Free prices are extended on Accessories only when they are ordered in connection 
 
 the Furnace and complete outfit. 
 Furnace, Electric Arc, Moissan Type, new model with carbon adjustment. Current consumption 100 
 
 amperes at 50-60 volts. Will accommodate a dish 100 mm in diameter by 55 mm high. With- 
 out cables. 
 
 Duty Free 87.40 Duty Paid 115.00 
 
 Accessories 
 
 1 pair of Cables, 150 cm long, with connections 
 
 Extra per meter per pair when cables longer than above are required 
 
 Screen of colored glass 
 
 Carbon Dish, 100 mm diameter 
 
 Magnesite Dish, " " " 
 
 Magnesia Dish, " " " 
 
 Carbon Electrodes, 500 x 22 mm, per pair 
 
 Furnace, Electric Arc, same as No. 29076 but with a current consumption of 200 
 
 volts. Without cables. 
 
 Duty Free 136.80 Duty Paid 
 
 Accessories 
 
 1 pair of Cables, 150 cm long, with connections 
 
 Extra per meter per pair, when cables longer than above are required 
 
 Screen of colored glass 
 
 Carbon Dish, 100 mm diameter 
 
 Magnesite Dish " " " 
 
 Magnesia " " " " 
 
 Carbon Electrodes, 500 x 40 mm, per pair 
 
 Furnace, Electric Arc, for Continuous Operation, for the handling of oxides difficult to reduce, such as 
 
 chrome oxide, etc., as well as more or less infusible metals. The oven may be filled through 
 
 the funnel at the top and emptied through the spout at the side. Dimensions of melting chamber 
 
 140 X 100 mm. For current consumption of 100 to 150 amperes at 50-60 volts. 
 
 Duty Free 95.00 Duty Paid 125.00 
 
 Accessories 
 
 1 pair of Cables, 150 cm long, with connections , 
 
 Extra per meter per pair when cables longer than above are required. . 
 
 Colored Glasses with one pair of extra glass discs 
 
 Crucible of Carbon, with outlet tube 
 
 " " Magnesite, with outlet tube 
 
 Upper Carbon Electrodes, 500 x 30 mm 
 
 Lower " " 300 x 40 mm 
 
 DpcTcs at 50-60 
 
 Duly Free 
 
 19.75 
 
 9. .50 
 
 4.50 
 
 .35 
 
 1.60 
 
 180.00 
 
 ily Paid 
 
 26.00 
 
 12.50 
 
 6.00 
 
 .45 
 
 .60 
 
 1.25 
 
 2.00 
 
 Duly Free 
 
 Duly Paid 
 
 16.00 
 
 21.00 
 
 4.50 
 
 6.00 
 
 1.35 
 
 1.75 
 
 3.80 
 
 5.00 
 
 4.50 
 
 6.00 
 
 .45 
 
 .60 
 
 .60 
 
 .75 
 
290S,S. 
 
 No. 2HIIS4 No. 29088 No. 29092 
 
 Furnace, Electric Arc, for distillations of phosphorus and various metals. The distillate is taken 
 off through the side tube and the remaining material after the removal of the lid. For current 
 consumption of 100 to 150 amperes at 50-OU volts. Dimensions of melting spare 140 x 100 mm. 
 Without cables. 
 
 Duty Free 171.00 Duty Paid 22.5.00 
 
 Accessories Dulv Frpp Duty Paid 
 
 1 pair of cables, 150 cm long, with connections 
 
 Extra per meter per pair, when cables longer than above are re- 
 quired 
 
 Crucible of Carbon 
 
 " " Maffnesite 
 
 Upper Carbon Electrodes, 750 x 30 mm, per pair 
 
 Lower " " 300 x 40 mm, per pair .60 
 
 29092. Furnace, Electric Arc, Vacuum or Pressure, or for operation with gases other than aii 
 sumption 100 to 150 amperes at 50-60 volts. Without cables. 
 Duty Free 285.00 Duty Paid 
 
 Accessories Ouly Free 
 
 1 pair of Cables, 150 cm long, with connections 10.00 
 
 Extra per meter per pair, when cables longer than above are requireil . 4..50 
 
 Carbon Crucible. 70 x 60 mm .35 
 
 <^arbon I'^lectrodes, 150 x 'J,i inm. onch ...... 
 
 Hi. 00 
 
 3. SO 
 4.50 
 
 (i.OO 
 5.00 
 (i.OO 
 
 Current con- 
 
 . . .375.00 
 I July Paid 
 21.00 
 
 6.00 
 
 crrit 
 
 29096. Furnace, Ar;,em Eltclric Vacuum, as \\< 
 pany, I", ti. IJuieau of Standatii.s, 
 
 L'.li LiiiMiniturics of the (.icncral Klectric Com- 
 ,es and description.^ nf various installations on request. 
 
'I 
 
 Cascade Attachment for Large F 
 
 taken apart 
 
 Healer Uni 
 
 Cascade Aflachm 
 
 FURNACES, HIGH TEMPERATURE ELECTRIC, NORTHRUP. a new construction of electric furnace on a non- 
 vacuum principle wherein the furnace itself develops in its heating chamber an atmosphere of carbon 
 monoxide. The furnaces consist essentially of three main parts, a graphite heater unit, an inner com- 
 partment of moulded refractory material into which the heater unit fits, and an outer compartment 
 filled with powdered refractory material, with outside jacket of polished monel metal. The furnaces 
 are of the vertical type and heating chamber in the large model is a tube 1^ inches internal diameter and 
 12 inches long, and in the small model 1 inch in diameter and 5j inches long. The Cascade Attachment 
 for the large model is inserted in the chamber of the large furnace after same has been brought to a high 
 temperature and the energy from the same transformer transferred by means of switch to the heating 
 element of the attachment. The resistor-unit of the Cascade Attachment consists of a tube of re- 
 graphitized Acheson graphite containing a crucible 11 mm internal diameter and 70 mm deep. These 
 furnaces operate only on alternating current of low voltage. 
 
 Transformer for Large Model — This is specially made for a primary of 110, 220, 220 or 240 volts with 
 five taps offs on its winding and a switch whereby the secondary voltage may be regulated as 
 many steps for a variety of temperatures. Capacity 4 K. W. for continuous operation and avail- 
 able for short intervals at a greater load. 
 Transformer for Small Model — Capacity 1.5 K. W. continuously or 3 K. W. for 30 minutes. 
 Temperatures — For the large model a working temperature of over 1600°C. is not recommended al- 
 though an occasional use at the temperature of melting platinum, 1755°C. is possible. With 
 the Cascade Attachment in the large model a temperature of over 3000°C. is attained throughout 
 a heating space of 15 cc. The small model may be safely operated at temperatures up to ISOO'C. 
 Use — These furnaces have been developed by Dr. Northrup for use in his own researches upon the 
 electrical conduction of matter at high temperatures but they have a great variety of application 
 between 1I00°C. and 1800°C., avoiding the inconvenience and expense of the vacuum type 
 furnace and where the temperature required makes the use of platinum wound furnaces impossi- 
 ble. No contaminating vapors are given off in these furnaces and their perfect black body tem- 
 perature makes them admirable for the calibration of optical pyrometers. The small furnace 
 is particularly adapted for melting cylinders or cones of coal ash without the gradual deterio- 
 ration of the heater unit by vapors given off by the material. The furnaces are well adapted to 
 the fusing of any of the precious metals and to the study of alloys because of the freedom from 
 contamination during the process. 
 
 243 
 
29100. Furnace, Northrup, High Temperature Electric, Large Model, iucluding graphite-cruoible-tube with 
 tongs for convenient handling and one cover piece for Furnace. Without transformer. . 360.00 
 
 29104. Special Transformer for Large Model, 4 K-W. capacity for continuous operation. To work on pri- 
 mary line of 110, 120, 220 or 240 volts, as ordered. The secondary voltage is regulated in five 
 steps by tap offs from the primary winding 165.00 
 
 29108. Cascade Attachment for Large Model, with double-pole double throw switch with two pairs of flexible 
 leads with connectors. 125.00 
 
 29116. Heater Units for Large Model, of standard size and construction and ready for quick connection . .35.00 
 
 29120. Graphite-Crucible-Tube for Large Model, 12^ inches long with .'\ inch wall, closed at bottom 5.00 
 
 29124. Special Tongs, for handling graphite-crucible-tubes 1.50 
 
 29128. Cylindrical Graphite Weights for Large Model, These fit in the graphite-crucible-tiibe and are 2 inches 
 high. They are convenient for use in building up load to bring the charge to any desired height 
 from the bottom of the Furnace. Arranged for convenient handling by special tongs listed 
 
 above 1 .50 
 
 29132. Special Refractory Cylinders for Large Model, These are of the same shape and serve the same 
 purpose as the Graphite Cylinders. They will not shrink or expand or contaminate the charge 
 and have very high insulation 4.50 
 
 29136. Extra Covers for Large Model, of refractory material with window or sight hole and a stopper to close 
 same when necessary 9.00 
 
 29140. Replaceable Resistor Units for Cascade Attachment 3.00 
 
 29144. Graphlte-Crucible-Tubes for Cascade Attachment 1.50 
 
 29146. Furnace, Northrup, High Temperature Electric, Small Model, with one graphite-crucible-tube with 
 tongs for handling, furnace cover piece and one compression carbon rheostat for insertion in the 
 primary for close control of the voltage 90.00 
 
 29148. Special Transformer for Small Model, U K.W. capacity for continuous operation or 3 K.W. for 30 
 minutes. Primary winding to order for 110, 120, 220 or 240 volts. This transformer is not 
 sold separately and is furnished only with the Small Model Furnace 65.00 
 
 29152. Heater Unit for Small Model, complete 30.00 
 
 References— 
 
 "Resistivity of Copper in Temperature Range 20° C. to 14.'iO° C." Journal of the Franklin Institute, January, 19H. 
 
 "A New High Temperature Furnace." Metallurgical and Cliemieul EuyincerinR. Jariu.iry, 1D14. 
 
 "High Tcmperalure Resislivily of Refractories; a New Method of Measuring, with Results for Alundum." Metallurgical 
 
 and Chemical Engineering, February. 1914. 
 "Temperature and the Properties of Mailer." Metallurgical and Chemical Engineerine, June, 1912. 
 "Molybdenum and Tungalen; Their Thermal E, M. F." Metallurgical and Chemical Engineering. January, 1913. 
 "Realivily of a few Metals Thru a Wide Range of Temperature. Journal ol the Franklin Institute, February, 1913. 
 "Some EITecIs of Temperature upon Ihe Resistance of Graphlle and Carbon." Metallurgical and Chemical Engineering, 
 
 Mnv, 1913. 
 "Resistivity of Pure Gold In Temperalure Range 20° C. to ].iOO° C." Journal of the Franklin Inatitute. March, lOU. 
 "Resistivity of Brass: Solid and Molten." Metallurgical and Chemical Engineering, March, 1914. 
 "Cascade Arrangement for Graphite Furnaces." Metallurgical and Chemical Engineering. May, 19U. 
 
 Complete eight page circular, shouing heating curves, eic, will be sent upon request. 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 2915t> 
 
 29156. Fusel Oil Apparatus, Bromwell, with stopcock and glass stopper in accordance with the requirements 
 of the U. S. Dcparttnent of Agriculture, Bureau of Chemistry, Bulletin 107, revised 3..50 
 
 GAS ANALYSIS APPARATUS 
 
 No. 2yn No ai No. 2917S 
 
 29160. Gas Analysis Apparatus, Orsat-Muencke, fur the determination of 00^, CO and O, particularly in 
 Hue and furnace gases. Consisting of graduated measuring burette with water jacket, aspira- 
 tor bottle, three absorption pipettes and naanifold tube which projects through the upper left- 
 hand side of the case and which is provided with four glass stopcocks. Complete in portable 
 
 oak case of durable construction 25.00 
 
 29164. Manifold for above with one horizontal and three vertical stopcocks, for three pipettes. . . . 8.00 
 
 29168. Gas Analysis Apparatus, Orsat-Fischer. This apparatus differs from the Orsat-Muencke only in 
 
 the addition of a drying tube inside the case and attached to the manifold, the left-hand end 
 
 of which turns down to make this connection instead of projecting through the wooden case 
 
 as in the Orsat-Muencke. For three pipettes 25.00 
 
 29172. Manifold for above 8.00 
 
 29176. Gas Analysis Apparatus, Orsat-Lunge, similar in arrangement and principle to the Orsat-Muencke, 
 but with four pipettes and bent palladium tube with lamp for heating same for separate estima- 
 tion of hydrogen, and also drying tube on outside of case. Complete in portable oak case. . 34.00 
 
 29180. Manifold for above, with one horizontal stopcock and four pipette stopcocks 10.00 
 
 Note — The pipettes, measuring burettes, etc., for the three preceeding gas analysis apparatus 
 are standard and interchangeable and are carried in stock separately as follows:^ 
 
 29184. Measuring Burette only, without water jacket 3.00 
 
 29188. Water Jacket only, for measuring burette 75 
 
 29192. Absorption Pipette, plain 2.00 
 
 29196. " " filled with glass tubes 2.50 
 
 29200. " " " " " " and copper spiral 2,50 
 
 29208. Soft Rubber Bag for attaching to pipette .50 
 
 29212. Rubber Bulb, of black acid-cured rubber with double valve set in bone fittings 2.50 
 
 29216. Gas Analysis Apparatus, Orsat-Dennis. See Journal of Industrial and Engineering Cheinisiry, Vol. 4, 
 No. 12. Complete with measuring burette in water jacket, aspirator bottle, manifold tube with 
 one horizontal stopcock and three pipette stopcocks and the new patent spiral absorption 
 
 pipettes after Friedrichs. Complete in portable case 45.00 
 
 29220. Gas Analysis Apparatus, Orsat-Allen and Moyer. See "Transactions of the American Society of Me- 
 chanical Engineers," Vol. IS, p. 901, and "Power Plant Testing," by J. A. Moyer, Chapter 
 IX, 1911. The distinctive improvement over the preceding forms of Orsat Apparatus is in the 
 substitution of hard rubber capillaries for glass and the new absorption pipettes which are easily 
 removable for the renewing of solutions 25.00 
 
No. 2!(220 No. 29280 
 
 29280. Gas Analysis Apparatus, Lomschakow, for Hue, generator and mine gasc^; a new system offering the 
 advantage of great rapidity of operation, quick and complete absorption, economy of reagents 
 
 and simple and convenient cleaning, 
 
 f inn pipettes 
 
 Extra Absorption Piprttcs, 
 
 See Chemiker-Zeilung, Nr. 133, 1913. With three absorp- 
 
 50.00 
 10.00 
 
 ^. l„^^ 
 
 29292. 
 29296. 
 
 No. 29288 No 2929b 
 Gas Analysis Apparatus, Williams Patent, Model A for complete analjaift ot combustible gases For 
 carbon dioxide, illuminants, oxygen, carbon monoxide, hydrogen methane and nitrogen Com- 
 plete in portable oak case 50.00 
 
 Portable Explosion Coil, with batteries, in quartered oak case 5.00 
 
 Gas Analysis Apparatus, Williams Patent, Model B for flue gas analysis. With Williams' special bub- 
 bling pipettes. For carbon dioxide, oxygen and carbon monoxide 35.00 
 
:930(] No. 2!!a(IS jNu. 29311, 
 
 GAS ANALYSIS APPARATUS, BURRELL. U. S. BUREAU OF MINES TYPE. This series of Gas Aualvsi^ Ap- 
 paratus is made in accordance with the original drawings furnished us by the Bureau of Mines and is in 
 exact accordance with the specifications and descriptions in Bulletin 42 of the Bureau of Mines, The 
 Snni-plihg and ExaminaHon\oJ Mine Gases and Naiurcl Gas, Burrell and Seibcrt. The figure numbers 
 itiven refer to illustrations in the above Bulletin. Prices on individual glass parts are quoted on ap- 
 plication. All connections in explosion pipettes are of No. 27 platinum ivire. 
 
 Apparatus for the Determination of Methane in Mine Air, Portable Form, Fig. 13 of Bulletin 42. Com- 
 plete in wooden case with sliding doors, rubber tubing, clamps, etc 17.00 
 
 Complete Set of Glass Parts only 8.00 
 
 Apparatus for the Determination of Carbon Dioxide and Methane in Mine Air, Portable Form, Fig. 14 
 of Bulletin 42. Complete with rubber tubing, clamps, etc.,inwoodencasewithslidingdoors. 18.50 
 
 Complete Set of Glass Parts only 9.00 
 
 Apparatus for the Approximate Analysis of Mine Air, Portable Form, Fig. IG of Bulletin 42. Pipettes are 
 
 filled with glass tubes not shown in illustration. Complete in wooden case with sliding doors 29.50 
 
 Complete Set of Glass Parts only 17.00 
 
 29300. 
 
 29304, 
 29308. 
 
 29312. 
 29316. 
 
 29320. 
 
 No. 29324 No. 29332 No. 293-10 
 
 29324. .Apparatus for the Exact Analysis of Mine Air and Flue Gas, Laboratory Form, Fig. 7 of Bulletin 42. 
 
 Complete with three iron supports, rubber tubing, etc 35.50 
 
 29328. Complete Set of Glass Parts only 21.50 
 
 29332. Apparatus for the Exact Determination of Methane, Laboratory Form, Fig. 11 of Bulletin. Complete 
 
 with supports, rubber tubing, clamps, etc 34.50 
 
 29336. Complete Set of Glass Parts only 20.00 
 
U R H. 
 
 THOMAS COMPANY 
 
 29340. Apparatus for the Exact Determination of Carbon Dioxide and Metliane. Laboratory Form, Fig. 15 of 
 
 BiiUotiii 42. Complete with iron supports, tubing, etc 33.50 
 
 29.344. Complete Set of Class Parts only 19.50 
 
 No. 29348 No. 2935S No. 29368 
 
 2934S. Apparatus for Natural Gas Analysis, Laboratory Form, Fig, 23 of Bulletin. Complete with four iron 
 
 supports, rubber tubing, clamps, etc 45.00 
 
 29352. Complete Set of Glass Parts only 25.50 
 
 29356. Apparatus for Mixtures containing CO;, C^H^. O2, CO, Ha, CH4, CjHe and Nj, Laboratory Form, Fig. 
 
 17 of Bulletin 42. Complete with four iron supports, tubing, case, etc 56.00 
 
 29360. Complete Set of Glass Parts only 35.00 
 
 29364. Gas Collecting Tube, Haldane, with three-way stopcock at each end, capacity 70 cc 4.00 
 
 29368. Gas Absorption Tube, Blount, for moisture and carbon dioxide. Sec Hnldane "Methods of Air Analy- 
 
 :^':^" . 3.50 
 
 Gds Anahsib Apparatus Haldane Portable for gene al a 1 an! gis inalysis ebpe Ai le;3igned tor 
 physiological investigation&. See Journal of_ Fluj!<iology, VvL 'M. 1898 and Fig. 10, Haldane 
 "Methods of Air Analysis," 1912. Complete in wooden case, with rheostat for controlling the 
 current to the platinum spiral 45.00 
 
 Gas Analysis Apparatus, Haldane, for the determination of very small percentages of carbon dioxide 
 in the physiological investigation of air in ordinary rooms, schools, factories, etc. See Journal 
 of Hyc/iene, 1901, p. 109, First Report of the Departmental Committee on Factory Veniilaiion. 
 1902 and Fig. 11, Haldane "Methods of Air Analysis." 19tS. Complete in wooden case, , . 32.00 
 Official English Certificate for above 10.00 
 
No. 29388 No. 2n% 
 
 293S8. Gas Analysis Apparatus, P Falmiiu \nde on n ent and exact determination 
 of CUa in air. The standard apparatus tor investigations of ventilating and other sanitary con- 
 ditions of schools, factories, etc. Complete in case 50.00 
 
 29392. Sulphuretted Hydrogen and Ammonia Apparatus, Tutwiler, Standard U. G. I. Form. This apparatus 
 gives direct readings in grains per 100 cu. ft. of gas of HaS or NHj. It affords a simple and 
 accurate method for determining the efficiency of the condensing, scrubbing and purifying appa- 
 ratus in gas manufacture, A determination may be made in less than three minutes. In portable 
 case, with chemicals necessary for operation 25.00 
 
 29-596. Apparatus for Determining Hydrogen Sulphide in Gases, Johnson, Patented, a new system offering 
 the advantage that accurate results may be obtained from small samples of gas as compared with 
 the gravimetric method and that the time needed for a test is greatly shortened 18.00 
 
 29397. Apparatus as above but in case with necessarv reagonts .30.00 
 
 Gas Apparatus for the Quantitative Determination of Sulphur and Ammonia, consisting of an 
 ammonia saturator and automatic shut-off meter registering from Tjj'ujth of a cu. ft, to 100 cu. ft. 
 a double dry governor mounted on stand and a London Gas Referee's sulphur determination 
 apparatus, mounted as illustrated. The apparatus conforms to the latest modifications of the 
 Board of London Gas Referees 115.00 
 
 Sulphur Determination Apparatus, only, as used in above outfit, complete with burner and support 15,00 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 23432 No. 2U43tt 
 
 29408. Gas Bags, nval, of 
 CapiKit, 
 
 lions. 
 
 . 2a440 No. 2944S 1 
 
 , without stopcock 
 
 1 
 
 2.40 
 
 3.50 
 
 4.50 
 
 Each 1.50 2.1 
 
 29412. Brass Stopcock for above gas bags, to connect with tubing 
 
 29416. Gas Balance, Lux, for the automatic determination of the spccilic gravity of gases. In glass case with 
 
 levellinf; screws arui spirit level. 
 
 Dutv Free 116.00 Duty Paid 160.00 
 
 29420. Gas Balloons, of blown glass, for weighing gases. Shape _ .\ B < ' D 
 
 Each "l.OO 1.50 1.30 2.50 
 
 29424. Cas Generating Bottles, sloiit walleil, for generalm.: gases, etc. 
 
 Cai.acity, cc 12.j 2.30 .500 7.50 _ 1000 
 
 Each 12 .18 .25 .33 .40 
 
 29428. Fittings only for above gas bottles consisting of thistle tube, rubber stopper and outlet tube. 
 
 To fit, cc 125_ 250 500 750 1000 
 
 Each .35 .35 .35 .40 .40 
 
 29432. Fittings only for above gas bottles consisting of safety thistle tube, rubber stopper and outlet tube. 
 
 Tofit, cc ". .-j25 ^50 .500 7.50 1000 
 
 Each .40 .40 .45 .45 .50 
 
 29436. (;as Generating Bottles, with ground glass stopper, safety tube with glass stopcock and delivery tube 
 
 Capacity, cc 
 
 Each 
 
 29140. Gas Washing Botlles, Allihn, with stopper. Capacity, cc 2.50 
 
 Each 1.50 
 
 29418. Gas Washing Bottles, Bunsen, with rubber stopper. Capacity, cc 125 
 
 Each .40 
 
 29452. Gas Washing Bottles. Drechsel, high form. Capacity, cc 100 150 
 
 Each 75 .85 
 
 29456. Gas Washing Bottles, Drechsel, low form. Capacity, cc 100 150 
 
 Each .75 1.00 
 
 29460. Gas Washing Bottle, Friedrichs, new spiral form, on glass foot 4.00 
 
 29464. " " " " wdth spiral tube inside jar, without metal support. 
 
 Size, mm 200 x 40 300 x 50 
 
 Each 4.00 5.00 
 
 29468. Metal Support, for above 1.00 1.00 
 
 2.00 
 
 500 
 
 ' 2.00 " 
 
 250 
 1.10 
 
 250 
 1.10 
 
 .300 
 2.50 
 1000 
 2.50 
 
 300 
 .60 
 
 500 
 1.35 
 
 500 
 
 i;35 
 
A R THUR H. THOMAS COMPANY 
 
 29480. 
 29484. 
 29488. 
 
 29492. 
 29496. 
 
 29.jno. 
 
 No. 294;>l> No. 29-)m; 
 
 Gas Washing Bottles, Muencke, with wide mouth. Capacity, ci; 100 250 50U 
 
 Each 1725 1.50 2.00 
 
 Gas (ollecting Tube, with bulb in center and two filass stii|icofks 2..50 
 
 " " " long form, 125 cc capacity, with two stopcocks 2.50 
 
 Case for above, of polished mahogany, with fittings. To hold tubes ^ 
 
 Each.. 
 
 6.00 
 
 7.00 
 2.50 
 
 Gas Collecting Tube, short form, 125 ce capacity, with two stopcocks 
 
 Mailmg Case, with screw cap, for convenient mailing of No. 29492 gas collecting tubes 15 
 
 Gas Collecting Tube, Winkler, 12 inches long by 4^ inches in diam. ; of zinc with brass stopcocks. . , 3.00 
 
 No. 29504 No. :;y.i08 
 
 No 29516 
 
 No 295JII 
 
 No. 295aG 
 
 29504. Gas Burette, Bunte, TMthout w itt-i 1 n ket f•^ iduated to 50 cc in iVths, with two sCopcocks. . 5.00 
 
 29508. " " " sani( i^]So 29504 but with w iter jacket 5.75 
 
 295T2. " " Henipel, on «< if.lited wnodrn bises T\ithout stopcocks. Per set 5.00 
 
 29516. Gas Burette, Henipel-Winkler w ith nl i^fs stopcoi ks, on weii;iitcd wooden bases. Per set 7.50 
 
 29520. Gas Burette, Heinpe!. wiHi ( ihili tion for t{ tnpei \ture anrl i^res.^ure, for measurement of gas volumes 
 varying between .5 md lUO cc \\ ith stopcock and levelling bulb, complete as illustrated . . 12.50 
 
 29524. Connecting Tube for gas buiettes 15 
 
 29528. Levelling Bulb, on iron stmd con\t,mcnt toi use m gas analysis and other purposes 1.50 
 
 29532. Glass Bulb only, for abo\ e 75 
 
 29536. Gas Burette, Standard U G I Form, brmg Tiitwihr's modification of Hempel's burette. With ma- 
 nometer, correction tube ^ itei jicket lr-\t,llmg bulb and heavy metal bases. A special feature 
 of this burette is the four -n i-\ stopocl vihn b permits a permanent connection with the potash 
 pipette, thus obviating; the neceS'^it'v of repeatedly connecting and disconnecting the pipette 
 during the course of an anah sis . 25.00 
 
29518. 
 29552. 
 
 2955(i. 
 
 2!(557. 
 29560. 
 
 Gas Cylinder. Low Pressure, Empty, of str<l 
 
 inch; wilh sli.|n-'K-k ;iiiil I'lmpiing. '1 
 but iKit. (<.r rivciit., 
 
 8ize, i^l^ll^^ 
 
 Ciipiu'ily in riihic fi.'('l of oxygen at 1 
 
 Each 
 
 Gas Gylinder, High Pressure, Empty, of seamless steel c 
 cyliniirT is tested, ' ■ • ■ 
 
 . pre 
 
 Lizeil, testeil to (500 lbs. |)ressui-c to the square 
 .■ire fur siile iind arc returnable for re-filling 
 
 10x32 13x44 
 
 : 25 50 
 
 16.50 22.50 
 
 inches in diameter by 51 inches high. Each 
 
 ■li and stamped with the wording required by Paragraph 1S22A of the 
 iiniisf-ion lietjuhitions, which number is registered in New York with the 
 Chief iTi^iicrtdf ,,i tlic lluri'iiu for the Safe Transportation of Explosives and other Dangerous 
 Articles. 'I'liesr ryli riders are sold outnglit only and are not returnable for credit 15.00 
 
 Gas Cylinder of Carbon Dioxide, eonsisting of high pressure cylinder Mo. 29544 filled with 20 lbs. of 
 Carbon Di<i\nle as iiseil ki connection with freezing microtomes and other laboratory purposes. 
 Cylinders are ret iirtial>le f<ir re-filling only and not for credit 18.00 
 
 Gas Cylinder of Oxygen. sisting of high pressure cylinder No. 29544 filled with 70 cubic feet of 
 
 99% purccleid iol\tiel f\\ ^;eii i under INOO Ihs, a I Hs^Fi. ("Jxygen is absolutely free from the oxides 
 of carbon, hydcnriulinns and uthei- .lelri.rciniis iiii|nirities. As used in calorimetry, carbon com- 
 bustions in steel ;niLil>-.-i.-. eie. (s i nn ji Is ret unied foT refilling only not for credit 17.80 
 
 Gas Cylinders of Oxygen. These cylinders are filled with the indicated quantities of 97% pure Oxygen 
 (S, S While Dental Mfg. Co.) at lOOU lbs. pressure. These cylinders are only sold filled with 
 Owgen lint aie returnable when empty for either re-filling or credit at the prices indicated. 
 
 Capacity, gallnns 40 100 
 
 Each, filled wilh Oxygen 8.15 17.00 
 
 Cylinders returnable for credit at (elnuges prepaid! .... 6.00 12.00 
 
 Set of connections, {or :\.}.<.vi- mliiiders '. 1.75 
 
 Throttle Control Valve. 
 
 re(]uircd in I he use 
 
 of oxygen in calnn 
 
 Gas Pressure Regulator, 
 
 cylinders. 'I li' -.i 
 up to 40 lbs |ii' -■ 
 
 Ir n S ppo 
 
 e delivery of small quantities of gas from cylinders a 
 ■ ] .11. in eunnection with freezing microtomes and in the delivery 
 
 ■ I I J il J I'll ei, Ml)] list ions in steel analysis 7.50 
 
 Liiinidii a constant pressure of oxygen when delivered from pressure 
 
 > will deliver oxygen or other gas uniformly at any desired pressure 
 
 I One of the dials shows the pressure at which the oxygen is deliv- 
 
 p essu e ren a n ng n he t k 30 00 
 
 d ^o 9o44 4 00 
 
 W 
 fj h h 
 
 D r 
 
 it 
 
T H U R 
 
 29576. 
 
 29.580. 
 
 29.584. 
 
 29.588. 
 
 29.592. 
 29596. 
 
 29600. 
 29604. 
 
 29608. 
 
 Gas Generator, Kipp, improved form, for the continuous production of hydrogen sulphide; with large 
 
 side opening for filling. Complete with Geissler stopcock, funnel tube, etc. 
 
 Capacity, cc 250 500 1000 1500 2000 4000 
 
 Each 
 
 Rubber Rings, for use in the abo' 
 
 ohambei 
 
 3.50 4.00 5.00 6.00 7.00 9.01) 
 
 generator to prevent the iron sulphide from falling into the lower 
 
 .500 
 
 1000 
 
 To fit generator, cc 250 
 
 Each 30 .35 .45 
 
 i Generator, McCoy. A steady gas pressure is maintained by delivering the acid in drops. 
 
 2000 
 
 .60 
 
 Capacity, cc. . .: :.:...'. '. .". 1000 2000 
 
 Each 8.00 10.00 
 
 Gasoline Gas Generator, for operating one Bunsen burner or one blast burner in laboratories without 
 gas supply. Must be used in connection with a foot blower or other form of blast apparatus. 
 Dimensions 4^ inches diameter by 7 inches high and contains 14 lineal feet of evaporating sur- 
 
 fa. 
 
 Gas Holders, Berzelius-Pepy's improved form, of heavy copper, with glass gauge. 
 
 Capacity, liters 20 40 
 
 Each 20.00 25.00 
 
 Gas Holder, Eerzelius, entirely of glass with ground fittings; capacity 8 liters 16.00 
 
 Gas Generator, Tirrill, for generating gasoline gas for use m laboratories. This machine accomplishes 
 the mixing outside and is permitted by all fire underwriters without extra cost. The gas delivered 
 gives a white, absolutely smokeless flame without odor. It is composed of a generator placed in 
 the ground 30 ft. from the building and buried 6 ft. under ground, a mixer placed near the 
 generator 3 ft. under ground and an air pump placed in the cellar of the building. The machine 
 can be operated by either weight or water. The above illustration shows the machine operated 
 by weight. Any plumber or gas fitter can set the same up with the directions supplied 
 Number of burners 15 25 
 
 50 _ 
 210.00 
 
 75 
 410.00 
 
 _ ™ 
 525.00 
 
 Each 210.00 250.00 
 
 Gas Measuring Tubes, of glass, graduated, closed at one end, without stopcock. 
 
 Capacity 25 cc in ^ths 50 cc in i^tbs 100 cc in |th s 
 
 Each .65 " 1.00 TSO 
 
 Gas Measuring Tubes, same as No. 29600 but with stopcock. 
 
 Capacity 25 cc in I'pths 50 cc in ypths 
 
 Each ..\ 1.50 2:00 " 
 
 Gas Palladium Tube. Hempel, for the absorption of hydrogen, with about 2 grams of palladium sponge. 
 
 5.00 
 

 No. 2l)(il2 
 
 29612. 
 29616. 
 29620. 
 2962.1. 
 
 Gas Di 
 Gas Di 
 
 No. 39616 No. 29(124 
 
 itributors, of bras:*, with one supply pil"' ■irnl tluee burner connections with stopcocks,. 4.00 
 
 ilributors, of brass, same as No. 29612 but with burner in center 4.75 
 
 " " with gas supply pipe and four burner connections, with stopcocks. . . 4.75 
 " " " same as Xo. 29620 but with b\irner in center 6.00 
 
 No. 296^2 No. 29636 No. 29644 
 
 2962S. Gas Filter, for use with cither thr ( ucrninan m- Ihc Roux iSinietallic Thcrmo-regulators, to clean the 
 Has of coal tar or other impurities, thereby securing more satisfactory working of the regula- 
 tors , . . 5,00 
 
 296.32. Gas Filter Tube, with projections to support paper thimble and ground in connecting tube. The upper 
 connecting tube is 1 inch in diameter; without thimble 2.00 
 
 29636. Gas Generator, 'Autogenor," for generating oxygen, automatically producing an absolutely pure oxygen 
 from oxone at an^- desired pressure up to 50 lbs .' 45.00 
 
 29640. Oxone Cartridges, in tins each containing six round tablets, sufficient for 4^ cu! ft. of oxygen, 
 for use in above. Per cartridge 1.35 
 
 29644. Gas Generator. <<u ^lami with three flame Bunsen burner, .')0 cm long 12.00 
 
 29648. Gas Generator, Electrolytic Oxygen and Hydrogen. By means 
 of }>ure nickel electrodes and the use of 30% caustic soda 
 solution as electrolyte, pure oxygen and hydrogen are 
 generated in turn by reversing the poles of the battery. 
 The oxygen is very pure, being particvdarly free from 
 ozone. Height 7 cm by 15 cm in diameter. See Zn't,- 
 sckrift fiir den plipsikalischcn uiiil chcmiacltcn V rderricht 
 (Poske) XXV.r. p. 69. 
 
 Duty Free 11,55 
 
 Duty Paid 16.20 
 
ARTHUR H. THOMAS COMPANY 
 
 2965(i. 
 29660. 
 
 29668. 
 29664. 
 
 Cubic Foot Bottle, immersion t^'pe, standardized by the U. H. Bureau of Standards. This instrument 
 is the basis of all gas measurements; operating on the principle of displacing 1 cu. ft. of gas by a 
 volume of 1 cu. ft. of water 125.00 
 
 Cubic Foot Bottle, as above, cabinet form 275.00 
 
 " " " Yo, on wooden stand, for tcsfiiiL; llu' con'ortion of the registration of gas meters, 
 particularly the wet test meters as used for r\|KTiniriil.il jiurposes 55.00 
 
 Cubic Foot Bottle, as above, ,V cu. ft 55.00 
 
 Gas Meter, a wet test laboratory meter with a ^ di'um and a dial reading from YuVs^h of cu. ft. to 
 100 cu. ft. This meter is also furnished with a special dial having an hourly rate circle within 
 the To circle. This rate circle reads from to 6 ft. per hour. Complete with water gauge, ther- 
 mometer, spirit level and levelling screws . . 50.00 
 
 Gas Meter, a photometer wet test meter, with a vV cu- ^^ 'I'liir ■ n I ii 'ri!' I ■.'■■'■■ ;1"'. i :■■. linj^ from 
 to 5 cu. ft. per hour. This is the meter mostly u-' ■' i. i ! ■ . ■ i ■ i' .■,. '' ,■ ; ;',r Ttiakes 
 one revolution of the drum per minute in accordaufi' (■■. 1 1 li i Isr i( l;i1 r.u <■ .m >a Imii L:ri.-^ -hould be 
 burned in ascertaining its candle power, i.e., 5 cu ft. pei- hour. \\ ith waler g;iugi', Ihonuonieter, 
 two spirit levels and levelling screws 50.00 
 
ARTHUR H. THOMAS COMPANY 
 
 Harcourt Pentane Lamp, model adopted as standard by the Lnmlon Gas Referees with improvements 
 
 as suggested by the U. S. Bureau of Standards 75.00 
 
 Harcourt Pentane Lamp, as above, with certificate of the Bureau of Standards 87.50 
 
 Gas Meter, "Rotameter," an accurate instrument for showing instantaneously with direct reading 
 the volume of gas or liquid passed through it per hour. In ordering it is important to state the 
 kind of gas to be measured, the maximum and minimum capacity in liters per hour, the pres- 
 sure at which measurement is to be made, the diameter of the inlet and outlet tubes to which 
 the Rotamesser is to be connected and the temperature of the gas or liquid to be measured. 
 
 Capacity, liters per hour. 
 
 Duty Free 
 
 Duty Paid 
 
 .05-10 
 75.00 
 
 Capacity, liters per hour. . 
 Duty Free 
 
 Duty Paid 
 
 10-2011 
 31.50 
 42.00 
 
 .1-20 
 66.00 
 
 88.00 
 
 80-300 
 .54.50 
 46.00 
 
 1-50 
 45.00 
 
 50-500 
 39.00 
 52.00 
 
 2-100 
 37.50 
 50.00 
 
 JOO-1000 
 51.00 
 68.00 
 
 29692. Gas Regulator, for shutting off the supply of gas at any desired time, consisting of a specially con- 
 structed clock with timing device and gas valve. The gas valve is connected by rubber tubing 
 
 between the gas supply and the apparatus which it is to regulate 4.00 
 
 29696. Specific Gravity Apparatus, Schilling, for illuminating gas 18.00 
 
 211700. Gas Pipette, Hempel-Friedrichs, simple absorption, of reddish brown glass. See Zeiischrift fur angew. 
 
 Chemie, !91^. On metal stand 4.50 
 
 29704. Glass Parts only for No. 29700 3.00 
 
 29708. Gas Pipette, Winkler, for the determination of methane. On iron support, with platinum spiral. . 7.50 
 
 29712. Glass Parts, only, with platinum spiral 6.00 
 
 2971 6. Gas Pipette, Double Absorption for Cuprous Chloride, Standard U. G. I. Form. This pipette was designed 
 to replace the two double absorption pipettes otherwise necessary in making a gas analysis. 
 Bv simplv turning the cock it is possible to bring the gas in contact with the absorbent contained 
 
 in either "side of the pipette without disconnecting 10.50 
 
 29720. Glass Parts, only, for above 7.50 
 
n>ii-r. 
 
 No. 29724 N0.2H732 
 
 GAS PIPETTES. HEMPEL, mounted on improved iron supports with l:vc<| 
 
 tenedtothe supports by means of adjustable metallic clamps witii cork iiisct. 
 
 of the use of glass parts of slightly varying dimensions. To avoid breulcagc 
 
 pijjette are packed separately and must be set up in the laboratory. 
 
 Gas Pipette, Hempel, simple absorption, for liquid reagents, on new form iron si ;unl 
 
 Glass Parts only for No. 29724 
 
 Glass Pipette, Hempel, simple absorption, for liquid ami ^nlid reagents, on new form iron stand 
 
 Glass Parts only for No. 29732 
 
 Gas Pipette. Hempel, compound absorption, for ]i<|uid nii^ruls, on new iron stand 
 
 Glass Parts r.nlv for No i'!17.J0 
 
 1^9724. 
 
 29728. 
 29732. 
 29736. 
 29740. 
 
 29744 
 
 :(^s parts are fas- 
 Ijustment permits 
 iipports and glass 
 
 3.00 
 
 1.25 
 
 3.00 
 
 . 1.50 
 
 29748. Gas Pipette, Hempel, compound alisoiptuin. tin liquid and solid reagents, on n( 
 
 29752. Glass Parts only for No. 2974S 
 
 29756. Gas Pipette. Hempel, for the preparation of hydrogen, on m \\ iron stand 
 
 29760. Glass Parts only for No. 29756 
 
 29764. Gas Pipette, Hempel, with glass beads for ethylene absorption 
 
 29768. Glass Parts only for No. 29704 
 
 29772. 
 29776. 
 29780. 
 29784. 
 
 29788. 
 
 No. a^TTS ^O J "" 
 
 Gas Pipette, Hempel, simple explosion, witti stopcocK: ana platinum electro<lcs, 
 
 Glass Parts only for No. 29772 
 
 Gas Pipette, Hempel, explosion, with platinum electrodes, stopcock and levelling bulb 
 Glass Parts only for No. 297S0. 
 
 Gas Pipette, Hempel, with platinum spiral, for methane, mounted on new iron stand 6.00 
 
 257 
 
29796. 
 29800. 
 
 29808. 
 29812. 
 29816. 
 29820. 
 29824. 
 
 2982.5. 
 29828. 
 
 2S832. 
 2983G. 
 
 rn 
 
 
 ■h 
 
 
 Nil. 2983li No. 2981U 
 Gauge, Prfssure. 
 
 ^'^^Ujj^jjj^ 
 
 ■■lit 
 
 -loam, watiM- or air pressure but when 
 syphon. May be graduated to any 
 ordering. The 3 inch gauge connects 
 
 pipe thread. 
 3 5 
 
 on J iiK'ii pipo tlireail and ."■ iillii SAaiiNi- vnuhii' l.^ uii , 
 
 Diameter, inches . . , . . . ^ 
 
 Each 5.00 7.50 
 
 Gauge. Vacuum, reading in inches to 30 inches of niercury. Otherwise similar to No. 29792. Dial 3 
 inches in dianjctor 5.00 
 
 Gauge, Vacuum and Pressure, both on same dial, vacuum scale for to 30 inches of mercury, pressure 
 scale from to 1.5, 30 or 60 lbs. Range must be specified in ordering. Exactly the same in con- 
 struction as Nos. 29792 and 29796 14.00 
 
 Gauges, Wire, American Standard, B & 8, of best tempered steel. 
 
 .Size n to .36 5 to_36 
 
 Each 2.50 2.00 
 
 Glass Beads, solid, 3 to (3 mm in diameter. Per lb 90 
 
 " " hollow, 5 to 6 mm long by 4 to 5 mm in diameter. Per lb 70 
 
 Glass Cutter, Diamond. Price depends upon quality of splint and varies from $5,00 to $20.00. 
 
 " ■' with small steel wheel 20 
 
 " Tubing Cutter. Large size will cut tubing of f to 1 inch in diameter in lengths up to S inches; 
 small size will cut tubing ^ inch diameter in lengths up to 5 inches. 
 Sizo Small Large 
 
 L50 
 
 1.50 
 2.00 
 
 Each 
 
 Extra cutter wheels. Per dozen 
 
 Class Tubing Cutter, Griffin's form. 
 
 For lubes, mm in diaineter 17 30 
 
 Each ....._ ~U)i) 2:00 
 
 Glass Cutter, (.'onsisting of a. hardened, sharjienod ,slccl t:nife with wooden liandlc, A most convenient 
 niui satisfactory laboratory utensil. . ._ ^ 1.00 
 
 Glass Tubing Gauge, of steel, very convenient for rapidly sorting glass or metal tubing by outside 
 di;i]iiel(Ts. The slots vary in width by ^ mm. These gauges come in three sizes, the size meas- 
 uring fjom 5 to 11 mm being shown in the illustration. 
 
 Size, moi 1 to 5 ;5 to 1 1 11 to 16 
 
 Each 1. 00 r25 1.50 
 
 Glass Tubing, heavy walled for sealing, so-called "Einschmelz" tubing 
 
 Length, mm 500 600 700 
 
 Diameter, mm IS 20 22 
 
 Each ^40 .45 ^50 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 2!*SJS 
 
 Glass Blowers Table t nsi lin^ (f m ii n coverod tabic to]-> 7.j x 75 cm, siipiioiicii river ;i i.'.\liDdri- 
 < U fout liello«s \li\ ( ii\(nunf in the laboratory for glas.s-blowiiit;; as the blast lamp may 
 l)e left peimanciitlj in pi ite uii the table without blast lamp or burner. 
 Duty Free 17.50 Duty Paid 22.00 
 
 Glass-blower's Table, Thiiringian model, with single and double blast burncr.s, as shown in illustration, 
 permitting the use of flame of all kinds as used in ordinary laboratory s'ass blowing. The use 
 of this outfit makes laboratory glass blowing far easier of accomplishment than is possible with 
 the use of ordinary blast lamp and foot blower. 
 Duty Free 23.2.5 Duty Paid 27.85 
 
 Glass-blower's Table, as above without burners. 
 
 Duty Free 13.80 Duty Paid 16.50 
 
 View in Stock Room ShoMing Atijuslablc ParCiCions on HiglK and Glass TuhinL' on L<rt 
 
I)© ©) © Q 
 
 @3MM 
 
 K^5 MM 
 No. 29872 
 
 29856. 
 29860. 
 
 29.^84. 
 298S8. 
 
 29S96 
 29900 
 
 ; TLBLNt; AND ROD is cariieii in slock in the origioaj factory lengths of from H to 2 meters. Customera 
 are requested to .*tate the length to which pieces may be cut for shipment. On small orders, particu- 
 larly where factory length is not required, an extra charge is made for the special box required to insure 
 safe transit. The following prices are based on tubing with usual factory variations as to bore, thick- 
 ness of wail, etc. Where tubing must be selected to an exact measurement as to inside and outside 
 diameter, an extra charge is made. Specifications as to diameter of glass tubing are always taken to 
 be outside diameter unless otherwise stated, except in the case of combustion tubing where it is cus- 
 tomary to specify inside diameter in order lo make sure same will take proper size combustion boat. 
 
 Glass Rod, for easy manipulation before the lamp. From 1 to 25 mm diameter. Per lb 40 
 
 Glass Stirrers, with one end rounded and the other end pointed. 
 
 Longth, inches 4 5 6 S 10 12 15 
 
 Diameter, inches -J | -^^ j-g \ ^ i 
 
 Per dozen 20 .25 .30 .40 -GO 1.00 1.15 
 
 Glass Bending Tubing, Best imported. Particularly recommended for laboratory use because of the 
 case with which it can be manipulated before the lamp. Not to be confused with low priced, 
 thin walled "vial" tubing of either German or American make. 
 
 Outside diameter, mm 1 to 4 -5 to 20 21 to 35 36 to 50 
 
 Per lb ~"".45 .40 .50 " .60 
 
 Glass Tubing, Barometer, in three outside diameters, i, e., 6, 8 and 10 mm. Per lb 70 
 
 Glass Tubing. Capillary, with very small outside diameters, i. e., approximately 2, 3, 4 and 5 mm. The 
 2 mm tubing has a capillary fine enough to be designated as thermometer tubing. The tubing 
 of 3, 4 and 5 mm outside diameter has a bore of about 1 mm and differs from barometer tubing 
 
 only in the outside diameter. Per lb I.OO 
 
 Glass Tubing Combustion, Kavalier Hard Bohemian. Dimensions given are inside dimensions in 
 order to determine size suitable for various combustion boats. 
 
 Inside diameter, mm 3^o^S 9-25 
 
 Per lb ~ 1.10" 1.00 
 
 Glass Tubing, Jena. Combustion, containing very little alkali. Very tractable in the blowpipe flame 
 although as hard to fuse as the hardest Bohemian. Inside diameter, mm.. 3 to 5 G to 25 
 
 Per lb l.OO' J5 
 
 Glass Tubing, Jena Apparatus Glass, adapted for work before the lamp in the manufacture of appa- 
 ratus. Outside diameter 5 to 25 mm. Per lb 1.00 
 
 Glass Tubing, Jena Compound Robax Glass (registered trade-mark a light blue longtitudinal line) 
 for explosion furnaces, etc. Of great resistance to sudden temperature change, the action of 
 
 water, acid or alkali solutions, etc. Outside diameter 12 to 25 mm. Per lb .75 
 
 Glass Tubing, Jena Uviol Glass, of high transparency to ultra-violet rays and very thin wall. Im- 
 ported to order only. Duty Free, per kilo 3.50 Duty Paid, per kilo 7.00 
 
 Glass Tubing, Jena 397IU Glass, adapted for the enclosure of platinum wire, so-called fusing-in 
 
 glass. Outside diameter 5 to 12 mm. Per kilo 1.00 
 
 Glass Tubing, Jena Fiolax Glass, made especially for the manufacture of ampoules and other con- 
 tainers for sterilized solutions. Very resistant to alkalies under sterilization and at the same 
 time easy to manipulate before the lamp. Trade-mark for white tubing a red line and for amber 
 a white line. A very valuable tubing for laboratory work because of its resistance to alkalies. 
 
 Outside diameter 10 to IS mm. Per kilo 2.50 
 
 Glass Tubing, Thermometer, Jena 16™ Glass, of great resistance power, almost entirely eliminating 
 the periodical changes of the zero point. Registered trade-mark red longitudinal line with 
 
 white background. About 5 to 6 mm outside diameter. Per lb 1.75 
 
 Glass Tubing, Thermometer, Jena Borosilicate 59lii Glass, with white background with lowest possible 
 temper.ature coefficient, i. e., 1° C. = .0000177. For the manufacture of thermometers to measure 
 high tfTtiperaturos, i. e., up to ."jOO" C. About 5 to G mm outside diameter. Per lb. 2.75 
 
29904. Glass Tubing, Thermometer, Thuriiiiri:ui niakc, with white buckjiiruuud. AUml 5 lo miii outside 
 
 diameter. Per lb ] .00 
 
 29908. Glass Wool, of best Boiieniian spun glass. In original cartons. 
 
 Quality _A (wavy, coarse spun) FF (wavy, finespun) B (smooth, free from lead) 
 
 Per 25 gram carton. . . . 
 " 100 " ■' , ,. 
 
 " .iflO " 
 
 29920. 
 
 29924. 
 
 2992S. 
 
 29932. 
 
 29936. 
 29940. 
 
 29944. 
 
 29948. 
 
 No. 29924 
 
 Glut Testing Apparatus WeiSh ( n ster c\ Rlete ) fur measuring the consistency of rubber, sugar, 
 sugar sokitions, ghie, gelatine, fats, oils, etc. The time of rotation of a horizontal disc under 
 
 the impulse of a fixed weight is measured on the circular dial 200.00 
 
 Glue and Gelatine Tester, Alexander, of brass, with electric annunciator. See Journal of the Society 
 
 of Chemical Induslry, Feb. 28, 1906 26.00 
 
 Glue Viscosity Pipette, Alexander, with tripod, raetal jacket, etc 5.00 
 
 Glue Tester, Scott, for testing the tensile strength of glue, gelatine, etc., and for making comparative 
 tests of the hardness of greases, wax, etc., reading in pounds and fractions of ounces automati- 
 cally 25.00 
 
 Goggles, gas tight and indestructible, with rubber fittings and removable, clear glast 
 Graduates, Glass, of ordinary accuracy, graduated in ounces. 
 
 Capacity, ounces te _s_ ^ _ 6 8 
 
 Each 18 .22 ' .28 " T35 .40 
 
 Graduates, Glass, of ordinary accuracy, graduated in cubic centimeters. 
 
 Capacity, cc 30 60 12q_ _ 250 _ 
 
 Each .25 ' .28 .35 .50 
 
 Graduates, Glass, of ordinary accuracy, graduated in ounces and cubic centimeters. 
 
 Capacity, ounces 1 2 4 6 S 
 
 cc ^0 60 120 _ 1.50 250 
 
 Each 32 .35 .50 .60 .75 
 
 Graduate, Glass, 1500 cc capacity, graduated in cc 
 
 Graduate, with graduated stem, as used in moisture testing it 
 
 is graduated to 12 cc in i^gths. .Sec Bulletin Ko. lS.i 
 
 Forest Service 
 
 lenses 
 
 IG 
 500 
 
 i.io 
 
 wood that has been creosoted, etc. 
 of the U. S. Department of Agric 
 
 1.50 
 
 32 
 1.20 
 
 1000 
 1.40 
 
 32 
 1000 
 "2.00 
 . 1.25 
 
 Stem 
 dture, 
 . 1.20 
 
29952. Graduates. Aseptic Enamel Ware, of searnks'^ steel, « hite enameled, buth a(.i(i .mil tin- proof; gradu- 
 ated in cubic centimeters on the inside. 
 
 Capacity, cc 500 1000 2000 4000 
 
 Each 1.00 1.25 1.75 3.00 
 
 29956. Grain Germinator, Schonjahn, with thermometer; as used in determining the germinating power of 
 
 barley, etc., in malting. For 100 grains 4.00 
 
 29960, Grain Tester. Grobecker. of bra.ss, for seetioning 50 grains g^OO 
 
 APPARATUS FOR HAEMATOLOGY 
 
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 Fuchs and liasenlhal Jtuling 
 
ARTHUR H. THOMAS COMPANY 
 
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 Uiirker No, 1 Ituling No. 30088 
 
 HAEMACYTOMETERS, ZEISS. We particularly emphasize the advantage of using the original Zeiss make 
 of Thoma Haemacytometers and all modifications thereof; our experience having shown that the cheaper 
 makes are inferior and never satisfactory as to accuracy. Our stock of Haemacytometers, with the 
 exception of the Hayem-Sahli and the Thoma-Metz, is confined entirely to the Zeiss product. The 
 counting chambers when sold separately are supplied without leather case but with one each thick and 
 thin cover glasses. They are all of .1 mm depth, excepting the Helber and Fuchs-Rosenthal. The vari- 
 ous rulings are shown in illustrations on preceding page. 
 
 30000. Counting Chamber, Thoma ruling, with two cover glasses but without case 4.50 
 
 30004. " " Zappert " " " " " " " " 4.70 
 
 30008. " " Tiirk " " " " " " " " 6.30 
 
 30012. '• " Breuer " " " " " " " " 5.60 
 
 30016. " " Biirker No. 1 ruling. The chamber is provided with two counting surfaces sepa- 
 rated by a cross channel so that two countings can be done one shortly after the other. The 
 rectangular cover glass is placed in position before introducing the blood mixture, the drops 
 are placed upon the semicircular prominence of the middle plate and flow from thence by capil- 
 lary attraction upon the counting surfaces. With cross lines divided on both counting sur- 
 faces 7.40 
 
 30020. Counting Chamber, Biirker No. 1 ruling, but with spring clamps to hold cover glass in position. . U.OO 
 
 30024. Counting Chamber, Biirker No. 2, the counting surfaces of which are not provided with cross line 
 
 divisions. Counting is done by means of special ocular diaphragms; the value of the square 
 
 aperture of these diaphragms can be estimated by the stage micrometer (1 mm divided into 100 
 
 parts) cemented alongside the counting chamber. With three ocular diaphragms 8.85 
 
 30028. Counting Chamber, Biirker No. 2 ruling but with spring clamps to hold cover glass in position 11.70 
 
 .50032. Counting Chamber, Special, w^ith two counting surfaces as in the Biirker No. 1 but with the surfaces 
 ruled with the Neubauer ruling. As made specially for us by Zeiss and as used in the Clinical 
 
 Laboratory at Johns Hopkins University Medical School 11.70 
 
 30036. Counting Chamber, Helber, for counting blood platelettes, yeast cells, bacteria, etc. With Thoma 
 
 ruling but with counting cell 0.02 mm in depth instead of 0.1 mm 4.85 
 
 30040. Counting Chamber. Fuchs and Rosenthal, for cytological investigations of the corebro-spinal fluids, 
 
 with counting chamber 0.2 mm deep - 4.70 
 
 30044. Leather Cases, of morocco, velvet lined, for any of the above counting chambers 55 
 
 30048. Cover Glasses, for above counting chambers, square 0.4 mm thick _ 20 
 
 300.:.6. " " " Biirker counting chambers, rectangular, 0.3 mm thick 25 
 
 30060. " " " " " " " 0,5 mm " 25 
 
 30064. Mixing Pipette, Thoma, for red corpuscles, diluting 1 to 100; with rubber tube and mouth piece 1.80 
 
 30068. " " " forwhitecorpuscles. dilutingl to 10;wJthrubbertubeandmouth piece 1.80 
 
 30072. " " Rieder, for dilutingl to20; with rubber tube and mouth piece 2.90 
 
 30076. " " Miescher, for dilutingl to 100, 1 to 150 and 1 to 200; with rubber tube and mouth piece 4.30 
 30080. " " " for diluting 1 to 200, 1 to 300 and 1 to 400, with rubber tube and mouth piece 4.30 
 30084. Fluid Chamber, Biirker, for use on Biirker's counting chambers 75 
 
H 
 
 U R 
 
 H. 
 
 H O 
 
 M 
 
 M 
 
 N 
 
 Wilh Iwo pipelies Wiih ene pipeile 
 rod and white red or white 
 
 300S8. Haemacvlomeler. Thoma. i:uiii|.letL' with lealiR-r ciisi; and pipeltes 9.7,> 7.75 
 
 30092. " Zappert " " " " " " 9.90 7.90 
 
 30096. " Turk " " " " " " 11-50 9..W 
 
 30100. ■■ Breuer " " " " " " 23.60 21.30 
 
 30104. " Biirker 1 " " " " " " 12.60 10.60 
 
 30108. " Barker 1 " " " " " " «-iti. damps 16.20 14.25 
 
 30112. " Biirker 2 " " " " " " 13.90 12.10 
 
 30116. " Biirker 2 " ' " " " " withciaraoa 16.90 14.95 
 
 30120. " Special Biirker-Neubauer " " " " " 16.90 14.95 
 
 Note— For counting with Burkcr No. 2 clumiber without rulings, and in fact with all the counting cham- 
 bers, it is sometimes convenient to use tlio seven square diaphragms after Ehrlieh and the Ocular 
 
 Net Micrometer Nos. 30132 and 30144, both of which arc best used with thv .\djuvt;iblp Oculars 
 with fncu sing e\e lens N "0140 
 
 30132. 
 30136. 
 
 No- 30124 
 
 Haemacytometer Outfit, Biirker, for red corpuscles, consisting of Biirker No. 1 counting chamber with 
 clamps, Biirker fluid chamber, 2 mixing flasks 125 cc capacity, 1 diluting pipette 4975 cmm, 2 
 transfer pipettes and 1 blood lancet. Complete in case with directions for use and 100 diagrams 
 for tabulating results. See K. Biirker, Pfliiger's Arch. f. d. ges., Physiol., U^ 3S7 ff. 1911 . . 23.75 
 
 Haemacytometer, Hayem-Sahli, complete in case, consisting of the following, Eyepiece III with sliding 
 eye lens anil screw-in Hayem counter, including tables; object slide with chamber 0.2 mm deep, 
 without ruling, but with reference square of 0.2 mm side ruled on the floor of the chamber and 
 surrounded by concentric orientation circles; object slide with chamber 0.1 mm deep, with refer- 
 ence square of 0.2 mm side surrounded by concentric orientation circles and, in addition, a microm- 
 eter scale, i. e., 1 mm divided into 100 parts, 2 pipettes for the diluent of 250-500 cc capacity, one 
 red and the other white, pipette of 1-5 cc capacity, for red corpuscles; pipette of 5-25 cc capacity 
 for white corpuscles^ two mixing cells with stoppers, one marked "red" and the other "white;" 
 two thick and two thm plane, parallel cover glasses and one stirring spatulum 22.00 
 
 Ocular Net Micrometer, Zeiss, consisting of a square of 5 mm divided into small squares of 0.5 mm. , 1.55 
 
 Ocular Diaphragms, Ehrlieh, Zeiss, with square openings of 1 mm, 2 mm, 3 mm, 4 mm, 6 mm,S mm and 
 9 mm. Convenient to place on the diaphragm of any regular Huyghenian Oculars 3,10 
 
 Oculars, Adjustable, Zeiss, particularly recommended for use with the various ocular micrometers 
 in that the eye lens may be focussed sharply upon the micromeirr when resting on the dia- 
 phragm 
 
 Designation K. H. 2 H, 3 H. 4 
 
 Duty Free 6.25 2.75 2.75 2J5 
 
 Duty Paid 7.75 3.40 3.40 3.40 
 
ARTHUR li. THOMAS COMPA N Y 
 
 30144. 
 30148. 
 
 30152. 
 30156. 
 
 30164. 
 30168. 
 30172. 
 30176. 
 
 No. 3016O No. 30176 
 
 Ocular, Ehrlich, wit.li adjustable square diaphragm forjuse in blood counting, cytology, i:iv 11.40 
 
 Haemacytometer, Thoma-Metz, consisting of a counting ocular, counting slide, piano cover glass, pipette 
 forred corpuscles and pipette for white corpuscles. The usual graduations on the counting cham- 
 ber are omitted and are provided in the ocular which is adjusted for use with a4mm objective. 
 Small variations in the focus of the objective may be compensated for by adjustment of tube 
 length. This adjustment is controlled by the coincidence of the counting plate with a square 
 
 engraved on the slide. In case 16.00 
 
 Haemaglobinometer, Dare, complete in leather case 22.50 
 
 Haemaglobin Scale, Tallquist. A color scale of ten tints, ranging from lO*^. to 100*^7, bound in book 
 form, pocket size, complete with 50 sheets of standard filter paper sufficient for 1.50 tests, and 
 
 directions for use 1.50 
 
 Haemometer, Sahli, original Swiss make being constructed under Dr. Sahli's personal supervision and 
 not to be confused with the many unsatisfactory imitations at a lower price. Complete with direc- 
 tions for use 7.50 
 
 Standard Colored Tubes for above, each 1.25 
 
 Graduated Tubes for above 1.25 
 
 Graduated Pipette for above 1-25 
 
 Haemometer, Fleischl, for measuring the percentage of haemaglobin in blood. The standard of com- 
 parison in this instrument is a tinted wedge of glass mounted movably beneath the stage. Only 
 a small quantity of blood is required and the results are obtained easily and quickly. Complete 
 in case with lock and handle 24.00 
 
30180. 
 
 301J14. 
 
 30188. 
 30192. 
 301%. 
 
 Nd. 301S0 
 
 No. 30196 
 
 Haemometer, Fleischl-Miescher, for estimatiiif? the absolute as well as the relative percentage of liaema- 
 
 filobin content of blood with great accuracy. Complete with ceils, naixing pipette, etc. 45.00 
 
 Capillary Tubes for FleischI Haemometers of varying capacities to suit wedge of instrument. Capacity 
 
 in cubic millimeters. Each 30 
 
 Yellow glass disc, for use with FleischI haemometers in day light. Each 1.75 
 
 Coagulometer. Blffi-Brooks. Complete with thermometer 8.00 
 
 Coagulometer, Brodie-Russell-Boggs, for use on the stage of the microscope. >See Johns Hopkins Hos- 
 pital Bulletin, June-July, 1907 9.00 
 
 Coagulometer, Schultz, consisting of small glass tubes each with 14 bulbs, which may be broken off 
 readily with the fingers for introduction into the normal salt solution A simple and convenient 
 method for determining coagulation time of blood. See Berliner klin. Wochenschr., 1910, N'o. 
 13. Each 20 
 
 30204. Apparatus for the Determination of Urea in the Blood, Marshall. Complete outfit as shown in the illus- 
 tration consists of two calcium chloride tubes, two Erlenmeyer flasks, two cylinders, one gas 
 washing bottle, two rubber stoppers to fit cylinders, one Chapman filter pump, three special 
 Folin tubes with perforations in bulb, three glass bulb connecting tubes, tubes for connecting 
 flasks and tubes to reach to the bottom of the cylinders with necessary hose, etc. See Journal 
 
 of Bioloqlad Chemistri/, Vol. XV. No. 3, Se-plember, WIS. Complete outfit 7.00 
 
 30208, Folin Tube with perforated bulb, for above, each ' ' ,15 
 
 30212. Bulb Connecting Tube, for above, each Iso 
 
 30216. Connecting Tubes, short, for connecting flasks, for above, each '.'. !lO 
 
 30220. " " long, to reach bottom of cylinders, for above, each Il0 
 
 30224. Stalagmometer, Traube, for determining the surface tension of fluids by the number of drops'form'ed 
 by a given volume in a given time and as used for the small drop reaction in the diagnosis of ty- 
 phoid vaccines and other studies in immunity. See Biockem. z. Mdrz, 1910, Munch, med. W. 576S. 
 1910 and Journal of the American Medical Association, May S8, 1910. Complete outfit consisting 
 of three accurately calibrated glass tubes one each for small quantities of thin liquids large 
 quantities of thin liquids, and one specially for blood and other more viscous solutions ' 16.00 
 30228, Stalagmometer Tubes, as above, if ordered singly, each " ' j'gg 
 
3023G. 
 
 30240. 
 
 30244. 
 30248. 
 
 ^ 3023C No. 30210 3024J 30218 
 
 Viscoyimetei, Hess, far detennining the viscosity of blood. Complete in case, with instructions for 
 
 use 22.25 
 
 Blood Capsules, Wright, uf soft glass, 2^ inches long. Per 10 50 
 
 Blood Collector, Vacuum, as devised by Dr. Keidel for collection of blood for Wasserman and other 
 tests, consisting of an ampoule of 5 cc capacity from which the air has been exhausted, a piece 
 of rubber tubing, a syringe needle and a glass tube to protect needle after sterilization. Per 
 
 dozen 2.40 
 
 Blood Lancet, Swan, for drawing blood .25 
 
 Blood Lancet, English form, single end, with guard screw to regulate depth of stab I.OO 
 
 " " " " double end, with both points protected for carrying in the pocket. 1.50 
 
 Blood Pipettes, Wright, of soft glass with end rounded for convenient application of rubber tube and 
 
 carefullly drawn point; length 7] inchr's over all. Per 10 ,50 
 
 L 
 
 10 
 
 18 
 
 26 
 
 .60 
 
 0.80 
 
 .90 
 
 14 
 
 20 
 
 28 
 
 .75 
 
 1.00 
 
 1.25 
 
 11 
 
 16 
 
 20 
 
 .60 
 
 .75 
 
 .90 
 
 No. 30272 Gauge lor No. DU^iTO No. 3027G 
 
 30260. Hammers, of solid cast steel, wedge shaped, for breaking ores. 
 
 Weight, ounces 7 
 
 Each .50 
 
 30264. Hammers, for geologists, of solid cast steel, with edge parallel to handle. 
 
 Weight, ounces , 
 
 Each 
 
 30268. Hammers, for geologists, of solid cast steel, with edge at right angle to handle. 
 
 Weight, ounces 
 
 Each 
 
 30272. Hardness Tester (Scleroscope), for measuring the hardness of metals. A miniature trip hammer is 
 dropped from a fixed height upon the surface of the metal the hardness of which is to be tested. 
 The height of the rebound of this hammer depends on the hardness or amount of resistance to 
 penetration offered by the metal, and is measured by the Scleroscope scale. In addition to the 
 Scleroscope proper the outfit consists of one plaster-mount vessel, one nickeled and enameled 
 swing arm and stand, one magnifier, hammer for soft metals only, one brass and one hard steel 
 standard reference bars, 50 blank curve charts, all in polished hardwood carrying case 150.00 
 
 30276- Hardness Tester, Keen, a simple portable instrument for testing the hardness of metals, the readings 
 of which may be easily converted into approximately the Brinnell hardness numerals. A standard 
 weight drops from a standard height, delivering a blow of constant magnitude on a socket io 
 which is mounted a hardened steel ball. The indication on the piece to be tested is measured with 
 a small celluloid gauge graduated to it^ mm or with a microscope. The instrument weighs only 6| 
 lbs., is thoroughly portable and is finished with highly polished nickel plate. Complete with three 
 extra hardened steel balls and measuring scale 18.00 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 30280 No. 3029G— With lop removed, showing replaceable healing units 
 
 30280, Hardness Tester, Brinell, for use in making Brinell's ball impression test or Ludwik's test by conical 
 impressions. This method is standard throughout the world and gives numerical values of the 
 hardness of materials without elaborate preparation., and insofar as iron and steel are concerned, 
 the tensile strength as well. Some of the applications of this instrument are as follows: — 
 
 Rapid control of chemical carbon determinations during iron and steel smelting. 
 
 Testing finished articles without damaging the same, say railp, tires, projectiles, armor 
 plates, gun barrels of ail kinds, structural steel, etc. 
 
 Examining the nature of the material in entire or broken parts of machinery, where the 
 making of a tensile test bar is impossible. 
 
 Testing the degree of hardness and softness obtainable by thermal treatment of any steel- 
 Testing uniformity of temper. 
 
 Ascertaining the effect of the nature and temperature of various hardening fluids. 
 
 Studying the effect of cold working, etc.. etc. 
 For a maximum pressure of 3000 kilograms. 
 
 Duty Free 210.00 Duty Paid 250.00 
 
 30284. Hardness Tester, Brinell, as above, for a maximum pressurf of 5000 kiloiiramy. 
 
 Duty Free 235.00 Duty Paid 280.00 
 
 30288. Hot Plates, for gas, with extra heavy polished steel top. 
 
 Length, inches IS 24 30 36 
 
 Width, inches 14 IS 18 18 
 
 Each 12.00 Ki.SO 21 .(iO 26.50 
 
 30296. Hot Plates, Electric, "Multiple Unit" Type, wound for 110 and 220 volts interchangeably. Size 6| x 18 
 inches reaches 400° F. on low heat, 600" F. on medium and 750° F. on high heat, and consumes 
 330, 660 and 990 Watts, respectively, for these temperatures. 
 
 Size, inches 12} x 12^ 125 x IS 18 x 24 6-J x 18 
 
 Each, one heat 17,.50 24.50 34.00 15.00 
 
 Each, three heats 20.00 27.50 37.50 17.50 
 
 Extra Units, each 3.25 4.00 4.00 2.50 
 
 Rewiring Units, each 2.50 3.00 3.00 2.00 
 
Hot Plate, Hoskins Electric, with heating elements of nickel-chromium. \^'ith 500 watts gives a maxi- 
 mum temperature of 483° C. With pressed steel top 6 inches in diameter. Works equally well 
 on alternating or direct current but voltage must be specified in ordering. Furnished with six 
 feet of flexible cord and plug. Requires use of 5 ampere snap or knife switch 6.00 
 
 Hot Plate, Hoskins Electric, with polished sheet steel top and cast iron legs. Spiral resistance unit 
 covers circular area 5f inches in diameter in center of top, 12 inches square. Gives maximum 
 temperature with 500 watts of 260° C, at center and 121° C. at edge. Works equally well on 
 direct or alternating current but voltage must be specified in ordering. Furnished with 6 ft. of 
 flexible cord and plug. Requires 5 ampere snap or knife switch for operation 8.00 
 
 Hot Plate, Hoskins Electric, Three Heat, with polished sheet steel top 12x18 inches, with square 
 steel legs. Resistance unit composed of three parallel windings, each controlled by a snap switch 
 on front of plate. Heat distribution is absolutely uniform. At '"Low" heat with 600 watts gives 
 177° C, "Medium" with 1200 watts gives 232° C. and "High" with 1800 watts gives 288° C. 
 Works equally well on direct or alternating current but voltage must be specified in ordering. 
 Requires use fa 1 lip] Inife'^wt h I) amperes rapa it\ (i 110 volts, and 10 amperes on 
 220 volts 
 
 Nos 30316 and 30320 
 
 30312. Hot Plate, Electric, Three Heat. Furnished with regulating switth j ft U flexible < oi i md snap 
 switch. Gives maximum temperature of 315° C. when running idle. Of polished steel. Operates 
 equally well on direct or alternating current but voltage must be specified in ordering. 
 
 Length, inches 6 6 
 
 Width, inches _ 6 J^ 
 
 Each 9.00 11.00 
 
 30316. Hot Plates, Electric, Three Heat, circular form, of polished steel with slate base, with regulating 
 switch. All are furnished with 6 ft. of flexible cord and the 4^ and 6 inch sizes with a lamp socket 
 plug. No socket plug is furnished with the 8 inch size but a plug switch is furnished with the 
 10 inch. Operate equally well on direct or alternating current but voltage nust be specified in 
 ordering. Maximum surface temperature on "High" heat when running idle about 340° C. For 
 arrangement to use these heaters in connection with Extraction Apparatus, No. 27564. 
 
 Diameter, inches Ah 6 8 10 
 
 Each 6^0 7.50 10.00 13.00 
 
 30320. Hot Plate, Electric, circular form, for single heat, with 6 ft. of cord and lamp socket plug but without 
 regulating switch. Diameter, i^ inches. Of polished steel on slate base. Gives surface tem- 
 perature when running idle on 250 watts of about 340° C. Operates equally well on direct or 
 alternating current but voltage must be specified in ordering 4.00 
 
 30324, Hot Plates. Electric, rectangular form, for one heat. Of polished cast iron. Furnished with 4 ft. of 
 cord but no plug. Will reach about 340° C. when running idle. Operate equally well on direct 
 or alternating current but voltage must be specified in ordering. 
 
 Length, inches 12 IS 
 
 Width, inches 9 _ 1^2 
 
 Each 11-00 16.50 
 
 30328. Hot Plate, Electric, rectangular form, same as No. 30324 but with three heats and furnished with 
 4 ft. of cord and plug switch. Operates equally well on direct or alternating current but voltage 
 must be specifled in ordering. 
 
 Length, inches 12 18 
 
 Width, inches 9 12 
 
 Each 13.00 18.50 
 
 30332. Hot Plate, Electric. long form, with three moderate heats, very suitable for extraction apparatus 
 such as No. 2756S. With 5 ft. of cord and snap switch. Operate equally well on either direct or 
 alternating current but voltage must be specified in ordering. 
 
 Length, inches 24 24 
 
 Width, inches 2|_ 4i 
 
 Each 13.00 13.50 
 
ARTHUR H THOMAS COMPANY 
 
 ^ 
 
 
 HOT PLATES, HERAEUS PATENT, WITH AUTOMATIC TEMPERATURE REGULATION. These plates 
 are of aluminum with heating element of sheet Nichrome and reach a maximum temperature of 
 250°C. A micrometer screw is set to any temperature desired below the maximum, after which the 
 plate will maintain the desired temperature to within 1° without attention, all of which is accom- 
 plished without the use of rheostats. The plates are listed below both without regulator and with 
 regulator for both alternating and direct circuits. As the heating element is contained in an air 
 box 2 inches deep the hot plate proper can be removed and replaced with a plate with aluminum rings 
 extra price. 
 
 
 >i x25 
 400 
 
 125 X 50 
 000 
 
 20x40 
 1200 
 
 25x50 
 1800 
 
 10x85 
 
 Maximum current consumption, Watts 
 
 1300 
 
 Hot Plate, ns iibove, without regulator Duty Free 
 
 11.50 
 
 17.00 
 
 18.50 
 
 25.00 
 
 23.00 
 
 Duty Paid 
 
 16.10 
 
 23.80 
 
 25.90 
 
 35.00 
 
 32.20 
 
 " witli regulator for D.G., Duty Free 
 
 22.00 
 
 27.50 
 
 28.50 
 
 35.50 
 
 33.50 
 
 Duty Paid 
 
 30.80 
 
 38.50 
 
 39.90 
 
 49.70 
 
 46.90 
 
 " " " " withrcsulator for A.C, Duty Free 
 
 24.00 
 
 29.00 
 
 30.00 
 
 37.00 
 
 35.50 
 
 Duty Paid 
 
 .5.3.60 
 
 40.60 
 
 42.00 
 
 51.80 
 
 49.70 
 
 Aluminum Rings, for above Hot Plates. 
 
 
 
 
 
 
 
 
 
 
 12 
 
 15 
 6 
 
 18 
 
 Number of rings in set 
 
 
 4 
 .80 
 
 
 Duty Free, per set. 
 
 1.00 
 
 1.20 
 
 1.40 
 
 Duty Paid, " " . 
 
 
 1.15 
 
 1.40 
 
 1.70 
 
 2.00 
 
30346. 
 30348. 
 
 Hot Plate with Flask Heater, Electric, Multiple Unit Type. A practical combiniition of hot plate, 
 
 fltisk heater and sand bath. The hot plate is removable and either the sand bath or flask 
 heater may be inserted in its place immediately over the heating units. Attains a maximum 
 temperature of 540° C which may be reduced sufficiently low for ether or alcohol extractions. 
 The unit is rephiceable by the operator. Complete with connectint; cord and plug for either 
 
 110 or 220 volt lines. Voltage must be specified in ordering. ... 25.00 
 
 Extra Units, for either voltage 3.00 
 
 Rewinding Units at factory, each 1,25 
 
 HYDROMETERS. 
 
 ir Bauiue scale Hydrometers are grai 
 ^ for liquids heavier than i 
 
 ill aecordanee with the American Standard scale, i. e. 
 nd S.G. = ■ ^ I ^a for liquids lighter than water. 
 
 .303.52. 
 303.56. 
 30360. 
 
 Hydrometers, Specific Gravity, for liquids lighter thai 
 and 0.700-1.000. Each 
 
 water; ranges 0.700-0.800, 0.800-0.900, 0.900-1.000 
 1.00 
 
 .3036S. 
 30372. 
 
 30376. 
 .30380. 
 30384. 
 30388. 
 30392. 
 30396. 
 
 30400. 
 
 30404. 
 .30408. 
 
 30412. 
 
 30416. 
 
 30420. 
 
 30428. 
 30432. 
 
 30436. 
 30440. 
 
 Hydrometers,SpecificGravity,forliquidshcavierthan water; ranges 1.000-1.200, 1.200-1.400, 1.400-1.600, 
 1.600-1.800. 1.8OO-2.O00, 1.000-1.500, and 1.000-2.000. Each 1.00 
 
 Hydrometer, Specific Gravity, Patent, for both hght and heavy liquids in either small or large 
 quantities, as well as for solids. Provided with three scales on the one stem. Fig. 2 shows 
 the paper scale laid out flat, before beinit placed in the stem of the hydrometer. One scale is 
 graduated from 0.700 to 1.000 for light liquids in bulk, the second is graduated from 1.000 to 1.400 
 for heavy liquids in bulk, and the third is graduated in grams and to grams, serving as a balance, 
 for determining the specific gravity of light or heavy liquids and solids, which are placed in the 
 small graduated stoppered bulb of the instrument. Complete in tin carr^dng case. . . 4.00 
 
 Hydrometers, Specific Gravity and Baume, for liquids lighter than water; ranges 0.700-1.000 and 
 70-10; 0,700-0.850 and 70-34; 0.850-1.000 and 34-10: 0.700-0 800 and 70-44: 0,800-O.ftOO and 44-25, 
 0.900-1.000 and 25-10. Each 1.25 
 
 Hydrometers, Specific Gravity and Baume, for liquids lighter than water, with thermometer in stem; 
 ranges 0.7110 to 1 .000 and 70-10. Each 2.25 
 
 Hydrometers, Specific GravKv and Baume, for liquids heavier than water; ranges 1.000-2.000 and 0-70; 
 1.(I1K)-L4im and ()-41 ; 1.40O-2.000 and 41-70; 1,000 to 1.200 and 0-24; L20O-1.400 and 24-41; 
 1.400 1.000 and 41-54 ; 1 .000-1.800 and 54-64; 1.80O-2.000 and 64-70. Each 1.25 
 
 Hydrometer, Specific Gravity and Baume for liquids heavier than water, with thermometer combined: 
 1.000-2.000 and 0-70. Each 2.25 
 
 Hydrometer, Universal, Baume and Specific Gravity, for both heavy and light liquids. Baume ranges 
 from to 70 andlO to 100° in single degrees, specific gravity from 0.700 to 1.900. Each 1.75 
 
 Hydrometers, Baume, for liquids lighter than water; ranges 20-10°, 30-20°, 40-30°, 50-40°, 60-50°. 
 70-00°, 80-70°, and 90-80°; divided in ^°. Each 1.00 
 
 Hydrometers, Baume, for liquids heavier than water; ranges 0-10°, 10-20°, 20-30°, 30-40°, 40-50°, 50-60° 
 and60-70°; divided in 1^=. Each I.OO 
 
 Hydrometers, Baume, for liquids heavier than water; 0-50° and 0-70°; divided in single degrees. 
 Each 50 
 
 Hydrometer, Twaddle, for liquids heavier than water {Twaddle degrees multiplied by 5 and added to 
 l()00 = specific gravity); about 12 inches long. Ranges No. 0, 0-10; No. 1, 0-24; No. 2, 24-48; 
 No. 3, 48-72;No.4,72-102;No.5, 102-134 and No. 6, 134-160. Each 75 
 
 Hydrometer, Twaddle, same construction and scales as No. 30396 but small .s^izc. i. e,. about 6 inches 
 long. Each 1.00 
 
 Hydrometer, Brix, ranges 0-30°, 30-60° and 60-90° graduated in -J-°. Each 1.00 
 
 of Jena glass; ranges 0-15°, 15-30°, 30-45°, 45-60°, 60-75°, and 75-90°; graduated 
 inT^°. Each 1.25 
 
 Hydrometer, Brix, of Jena glass, range 20-25°, graduated in t^°, with enclosed Centigrade thermometer 
 of .Jena glass. Each 3.00 
 
 Hydrometer, Brix, of German silver throughout, ranges 0-30°, 30-60°, and 60-90°; graduated in |°. 
 Each 4.50 
 
 Hydrometers, Specific Gravity, Precision, of Jena 16 III glass, reading to between the third and fourth 
 decimal place from 0,700 to 1.950. Each hydrometer 350 mm long; ranges 0.700-0.760, 0-760-0.820. 
 0.820-0.880. 0,880-0.940, 0.940-1.000,1.000-1.060, 1.060-1.120, 1.120-1.180, 1.180-1.240, 1.240-1.300, 
 1.300-1.360, 1.360-1.420. 1.420-1.480, 1.4S0-I.540. 1.540-1.600, 1.600-1.660, 1.660-1.720, 1.720-1.780, 
 1.780-1,840 and 1.840-1.950. Each 2.50 
 
 Hydrometer, Specific Gravity, complete set of above (No. 30420) consisting of 20 hydrometer spindles and 
 one indicating thermometer spindle with which to determine the correct hydrometer to use in 
 a given solution 50.00 
 
 Hydrometers, Specific Gravity, complete set as in No. 30424 but certified to four points and with certifi- 
 cate of the Physikalisch-TechnischeReichsanstalt. In wooden case 70.00 
 
 Hydrometers, Precision, exactly same as No. 30424 and same ranges, but 15 cm long, for small quanti- 
 ties of fluids. Each 1.75 
 
 Hydrometers, Precision, complete set of No. 30432. In wooden case. . , 35.00 
 
 " " " " " " " certified to four points and with certificate of the 
 Physikalisch-TechnischeEeichsanstalt. In wooden case .55.00 
 
ARTHUR H. THOM AS COMPANY 
 
30452. 
 30456. 
 304SO. 
 
 30464. 
 
 30468. 
 
 30472. 
 30476. 
 
 30480. 
 30484. 
 
 304SS. 
 30492. 
 30496. 
 30500. 
 
 30504. 
 
 3050S. 
 30512. 
 30516. 
 
 30520. 
 30524. 
 
 30528. 
 
 305-32. 
 30536. 
 
 30540. 
 30544. 
 
 30o4S. 
 30552. 
 
 30-556 
 30560. 
 
 Hvdrometers, Precision, reading in specific gravity to the third deeinui! place. Set of six, 0.700-0.8.50, 
 O.SoO-1.000,_ 1.000-1.250, 1.250-1,500, 1.500-1.750 and 1.750-2.000. With separate thermometer 
 in case. Spindles are not sold separately. In wooden ease 15.00 
 
 Hydrometers, Precision, complete set as in No. 30444 but with certificate of the Physikalisch-Technische 
 Reichsanstalt. In wooden case 21.00 
 
 Hydrometer, Baume, of German Silver, for liquids heavier than water, scale 0-50° in 1° 4.50 
 
 Hydrometer, Alcohol, Gay-Lussae, scale from 1°-100° in single degrees 1.00 
 
 " Tralle and Proof Scales reading from 100° below to 100° above Proof and 
 from 1° to 100° Tralle in single degrees 1.00 
 
 Hydrometer, Alcohol, Tralle and Proof Scales as in No. 30460 and also with enclosed thermometer. 
 U. S. Custom House standard pattern 2.00 
 
 Hydrometers, Alcohol, U, S. Internal Revenue Bureau Pattern, covering the entire range of 
 spiritous liquors. No. 1, 0-100°; No. 2, 80-120°; No. 3, 100-140°; No. 4, 130-170°; No. 5, 160-200°. 
 Each 2.50 
 
 Hydrometers, Alcohol, Complete Set, as above, in polished wooden case with leather lining, includ- 
 ing one copper spirit can with standard thermometer. 24.00 
 
 Hydrometers, Alcohol, Plate. Set of three hydrometers 9 cm in length, for testing alcohol in mu- 
 seum jars and biological work without the inconvenience of pouring off a sufficient quan- 
 tify to float the usual large hydrometer. Reading from 30 to 100% volume and tested in the 
 Zeiss laboratories. In handsome case 5.00 
 
 Hydrometer, Ammonia, 3-5-10° Baume scale in 5° divisions 75 
 
 Sommer's Patent, for determining the specific gravity of Asphalt, graduated from 0.85 
 to 1.3° at 25° C, as recommended by the Committee of the American Society of Civil Engineers. 
 Complete with brass receptacle and fittings, with instructions for use 10.00 
 
 Hydrometer, same as No. 30484. but graduated from 0.950 to 1.100° 10.00 
 
 " (Barkometer) for tanning liquids reading from 0-60° Baume in single degrees 1. 00 
 
 Hydrometer, same as above but with thermometer and correction scale 2.50 
 
 Hydrometer (Barkometer) reading from to 60° Baume in single degrees with Fahrenheit thermom- 
 eter to 90°, scale about 5 inches long 2.00 
 
 Hydrometer, Benzene, also for coal oil, gasoline, naphtha, etc., scale 90-60° Baume reading in single 
 degrees. Each 2.75 
 
 Hydrometer Ether, rriiding from 0.75 to 0.700 Specific Gravity, with enclosed thermometer 2.75 
 
 Hydrometer Glue, li^'^i'lnated from 0-12° in 1° 1.25 
 
 Hydrometer, Lime-sulphur, for use in determining the degree of density of lime-sulphur solutions, as 
 recommended by Parrott and Stewart; scale is from to 38° Baume and from 1.000 to 1,350 
 specific gravity, without cylinder 75 
 
 Hydrometer, as above, with special cylinder 1.00 
 
 Special Cylinder only 40 
 
 Hydrometer, (Salinometerl with direct reading in percentage of salt content, range from 1 to 100% 
 in ] '■','n divisions 75 
 
 Hydrometer, Storage Battery, witii specific gravity scale, with range 1.100 to 1.300 and 7 inches 
 in length. Encii 75 
 
 Hydrometer, Storage Battery, h irh syrin^ie. The pointed tube of the syringe is inserted in the storage 
 cell opening and the (■IiTtr<.ilyle withdrawn by means of the bulb. The specific gravity is then 
 read by the liydcinurlcr floating in the cylinder of the syringe without the use of another con- 
 tainer. Reading from 1175 equals total exhaust of battery to 1300 equal full charge 1.75 
 
 Hydrometer, Sugar and Syrup, "sweet water spindle," Brix scale, — 5 to -|-5° in iVths 1.25 
 
 " " " Morse's Rendimento, for tropical cane sugar factories. A special hydrometer 
 with thermometer combini^d, for determining the possible j'icld of sugar from the cane by the 
 density of the raw juice. The hydrometer shows how much sugar to expect and, by comparing 
 this with the actual yield, the efficiency of the factory work can be estimated. 6.00 
 
 Hydrometer, Sugar and Syrup, Baume scale graduated in single degrees; 0-20° and 0-50°. Each .75 
 
 Hydrometer, Saxe's Areo-Pycnometer. for testing small quantities, only 3 cc of solution being neces- 
 sary, range 1.000 to 1.060 specific gravitj'' 2.50 
 
 Hydrometer, Vinegar, showing percentage of acetic acid 75 
 
 " " fSolidimeterl, for solids in vinegar, with I heinioinotcr 3,00 
 
ARTHUR H. THOMAS COMPANY 
 
 xn 
 
 305fiS. 
 30572. 
 3057G. 
 
 30580. 
 
 305S4. 
 
 3058S. 
 30592. 
 
 30593. 
 30594. 
 30595. 
 
 Hygrometer, Mason, wet and dry bulb, fur Lbe determiiiLition of relative and absolute humidity and 
 dew point in connection with the tables and directions. With black oxidized brass scale on 
 oak board 5x11 inches 2.25 
 
 Hygrometer, simple form, in nickel plated case, with scale 80 mm in diameter 2.75 
 
 " in brass case, with scale reading in degrees and percentage 6.00 
 
 " Wurster's model, for industrial use. For the testing of the moisture content of yarn, 
 cloths, bales of tobacco, paper, etc. With thermometer 10.00 
 
 Hygrometer (Sling Psychrometer), for obtaining more rapid results than are possible with a station- 
 ary wet and dry bulb instrument. Scale 0° to 100° F. io ^°. With copper protecting case. . 9.00 
 
 Hygrometer (Hygro-Autometer), an improved form of wet and dry bulb hygrometer, reading directly 
 in percentage of relative humidity and dew point without the aid of tables. On black japanned 
 iron frame 10.50 
 
 Hygrometer (Hygrodeik), an improved wet and dry bulb instrument showing relative and absolute 
 humidity, with dew point without reference to tables. With black, japanned iron frame. 12.00 
 
 Hygrometer, Registering (Hygrograph), latest model, for registering the relative humidity, As used 
 by manufacturers of food products, paper, explosives, etc., and in cold storage and tobacco 
 warehouses. Including charts for one year's use. 
 
 Duty Free 45.00 Stock 55.00 
 
 Extra Charts, per box of 53 sheets 2.00 
 
 Extra Pens, each 1,50 
 
 Special Ink, per bottle 50 
 
ARTHUR H. THOMAS COMPANY 
 
 Hygrometer, Lambrecht's Polymeter; an accurate hygrometer with thermometer ind ^ iiiout, toriec- 
 tion scales, used both in meteorology and for industrial purposes; non-toiiodiblr ^ith phosphor- 
 bronze finish with enamel scale, total height 245 mm, diameter of &<_ ili 7jiiuii, not to be con- 
 fused with cheaper forms of the name instrument 12 00 
 
 Hygrometer, Miniature Form, total height 140 mm with scale 75 mm in diametei m nou-toiioduig phos- 
 jihnr-ljronze case, with tliermometer; pai^ticularly recommended for libonton ust as m bac- 
 teriological incubators, etc 14 00 
 
 Hygrometer, Lambrecht, for factory use, for hanging on wall, without thcrnKiniftei, in nickel plated 
 
 zinc case, total height 150 mm, with scale 75 mm in diameter 5.00 
 
 Incinerator, Laboratory, for convenient disposition of laboratory and dissecting room refuse, particu- 
 larly infected animal carcasses and similar material. The arrangement of the combustion cham- 
 ber and burner insures the drj'ing of wet compact refuse by allowing air passage through it until 
 Any diip or liquid matter is caught in the trough below the burner. 
 Kjiii .i' ill its operation and because of asbestos lining causes very little 
 .1 1 1 is easy to take apart. Full directions for installation and 
 <■ I li iiiM liine. A f inch gas supply pipe is necessary and a proper flue 
 .Lii.^^ <.A Lumbustion. Size I is supplied with a single grate and 8ize II 
 
 5 finally consumed. 
 The apparatus is oroi 
 heat radiation in 1Iji 
 operation are sent ^^■i 1 1 
 for disposing of the pn 
 has two grates. 
 Designation. . 
 
 
 Outside dimensions, inches 15 x 11 x 37 IS x IS x 49 
 
 Capacity of combustion chamber, cu. inches 1412.5 _ 2S25 
 
 Each 60.00 " 90.00 
 
 Induction Coils, KuhmkorlT, mounted on polished mahogany base, with condenser and adjustable 
 vibrator. 
 
 Length of spark, approximately, inches i | 5 ^j 1 
 
 Each TaO oTtS ¥.00 13.50~" 18.00 
 
 Ink, Diamond, for writing on glass. 25 grams in gutta percha bottle. Per bottle 50 
 
Ja Mu e n \ H T Co 
 
 I 1 i 11 1 I 
 lit nd t t 
 Istbelo of lit 
 He ght n 
 
 Diam., cm 
 
 Each 
 
 Jars, Museum. A. H. T. Co. 
 Special Museum Jara . 
 prices, duty free, f. o. 
 jars of a size (except 
 
 Height, em 
 
 Diameter, em 
 
 Duty Free, per 10 . . . 
 
 Height, cm 
 
 Diameter, cm . 
 
 Duty Free, per 10 . . , 
 
 Height, em 
 
 Diameter, cm 
 
 Duty Free, per 10 . . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free, per 10 
 
 Height, cm 
 
 Diameter, mm 
 
 Duty Free, per 10 . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free, per 10 .. 
 
 Height, cm 
 
 Diameter, cm . 
 
 Duty Free, per 10 
 
 Height, cm. 
 
 Diameter, cm 
 
 Duty Free, per 10 . , 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free, per 10, . . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free, per 10 . . . 
 
 Height, cm 
 
 Diameter, cm 
 
 Dutv Free, per 10. . . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free, per 10. . . 
 
 bpe al tl f t nip ound mart ght utopi e tl k ol Aw dely 
 t 1 u 1 purpose of spe lal fin h fl 1 j, eat bnli an y 
 
 I nt 1 tl jars of simdar shape to be harl at iiuich less price. See 
 
 t t I 1 1 on import orders. 
 
 10 10 13 15 15 15 15 is 18 20 25 60 
 
 , . <.o 10 1.5 10 15 20 30 12 15^ _30 25_ 15 
 
 . . -50 .80 .60 1.00 1.80 3.00 6.80 1,30 2.00 7.55 6.00 8^00 
 Special Import List. For the convenience of those preparing lists of our 
 IS listed above for duty free importation we list the sizes available with 
 b. Philadelphia boxing extra. Orders are intended to be for at least 10 
 in the case of verv large sizes) and to aggregate at least $50.00 in value. 
 5 5 5 5 5 6 ti 6 6 6 6 
 
 1 _2 3 5 G S 
 
 75 .75 .75 1.05 1.15 1.80 
 8 8 S S 8 S 
 
 3 4 5 G.5 8 10 
 
 1 
 
 2 
 
 3 
 
 4 
 
 5 
 
 .75 
 
 .75 
 
 .75 
 
 .95 
 
 .95 
 
 S 
 
 2 
 
 3 
 
 4 
 
 10 
 
 2 
 
 .75 
 
 8 
 
 ir, 
 
 .95 
 
 
 
 1.15 
 
 9 
 3 
 
 2.40 
 9 
 4 
 
 1.05 
 
 9 
 
 1.15 
 
 1.35 
 9 
 9 
 
 1..35 1.50 
 
 10 
 
 10 
 
 1.90 
 
 10 
 
 2.70 
 10 
 
 0.00 1.15 1.15 
 
 10 10 10 
 6 7.5 10 
 
 2.70 
 
 12 
 
 1.15 1.35 1..50 1.50 
 
 1.70 1.90 3.00 4.50 5.55 
 
 12 12 12 12 12 
 
 10 12 1.5 IS 20 
 
 3.75 4.65 0.00 7. .50 9.75 
 
 1.15 
 
 13 
 
 1.35 
 13 
 
 2.25 
 
 15 
 
 1.70 1.90 
 13 15 
 
 16 2 
 
 2.40 
 
 15 
 3 
 
 3.75 
 
 15 
 25 
 
 7.50 
 15 
 
 1.50 1.70 
 18 13 
 
 2 8 
 
 1.70 1.90 2.65 
 
 2.05 2.25 2.25 
 20 20 20 
 
 9 
 3.75 
 
 6.G0 11.25 15.00 26.35 1.70 
 
 18 IS IS 18 
 
 11 12 15 18 
 
 2.45 2.05 2.85 
 
 1.90 
 
 20 
 
 30 
 
 37.60 
 
 15.00 2.85 3.20 4.50 
 
 25 30 30 .30 
 
 33 5 S 10 
 
 56.00 3790 5.90 6.85 
 
 10_ 
 4.50 
 
 20 
 JO 
 4.S0 
 
 "s 
 
 3.30 
 
 6.60 
 30 
 
 15 
 
 1.70 
 
 18 
 
 7.50 
 20 
 16 
 
 9.30 15.00 
 
 20 
 
 20 
 
 25 
 
 9.60 
 
 30 
 20 
 
 18_ 
 
 11 lis 
 
 9.00 12.00 18.75 
 
 22 22 22 
 
 12 14 16 
 
 6.90 
 
 25 
 
 ;.55 
 
 20 
 
 15.0 
 
 30 
 30 
 
 9.00 
 25 
 
 30 
 
 22.50 34.10 
 
 35 
 
 35 
 20 
 
 7.75 11.65 19.40 29.15 45.75 5.80 
 
 40 40 45 45 .50 50 
 
 10 15 12 20 10 25 
 
 35 
 
 8 
 
 7.20 
 55 
 
 11.05 15.40 26.25 38..50 10.85 18.40 15.40 30.65 13.15 66.50 14.90 
 
30628. Jars, Museum, Hopkins-Columbia Model, as riiniisiictl l>y us in [jiru,. ,|ii:irititirs to vai'ioiis laboriitories 
 in Jolins IIopkiriM lliiivrrsity ;i.iiil ( ^ilii[i.ij):i riii\oi-sJi \ . 'I'lii^ si oi)|)(t of the jar is ground inside 
 hut flic lid remains some distaiirc from IIm' i\]\\\i-r ll;iiif!'-. ' 'lass and ^^■ll^klllanship identical with 
 No. im-M. Thvi^v jars aru iiol ntiuhLily carnrd in slurk. 
 
 Height, cm !) 10 U ]'.', ]:, \R -jO 
 
 Diameter, cm 4 ."i II 7 'i .s 14 t> 
 
 Duty Free, per 10 1.30 l..^*0 1.80 2.2.i 2.(i0 <i.(i5 2.40 
 
 Height, cm 2U 22 L'l: l'I :ii) 35 '?,:, 
 
 Diameter, cm 10 9 -Jli 14,5 15 !t,5 :',(} 
 
 Duty Free, per 10 ~ 4.70 4.00 12.50 7.:r> 11.00 7.70 75.00 
 
 30632. Jar, Museum. oF same quality and finish as No. 30620 Imi ■■■. n L I'l ■ M.; \>. jdi air liglifc yrinding btdwccn 
 tlio lid and top of jar and with the downward |ii(<|i'. i.., ■ . : m- hrl luusidv fitting into the jaf. 
 l.huw preventing the sticking of the lid sometinn.- i m .-u.i,, ji'd wlirn the ground surface i.s 
 inside tlic jar. The flat lid permits stacking of the |ai eii her i\ lieti filled or empty. 
 
 Height, cm 10 10 13 15 lo 15 15 IS 18 " 20 25 60 
 
 Diam., cm 7 .5 10 7 -5 10 15 20 30 12 15 30 25 15 
 
 Each .50 .80 .60 1.00 1.80 3.00 6.80 1730 2700^ 7.55" 6^6 8^ 
 
 30636. Jar, Standard Museum, Whitall-Tatum Co., with mouth same size as body; with rubber band and 
 metal clamp and two glass suspension rings on under side of glass cover. By special arrange- 
 ment with the manufacturers we offer these Jars at original factory prices. 
 
 Height, inches 4 6 S 12 18 6 8 12 LS 8 
 
 Diameter, inches 2.1 2] 2\ 2J- 21- 3i 3t 3^ 3^ 5 
 
 Capacity, pints A '] 1 1?^ 2} If 2^ 4 6 5^ 
 
 Each "^SS ^1 ^3 ^9~ .54 S7 .62 ~^ .73 ^6 TOS 
 
 Per dozen 3.65 4.05 4.32 4.73 5.40 .'>.67 6.08 7.16 8.51 10.94 
 
 Height, inches 12 15 18 S 12 S 12 15 18 
 
 Diameter, inches b 5 5 6J- Of 7^ 7^- 7-t- 7-^ 7^ 
 
 Capacity, pints 8 10 __ 12 8 12 9 12 18 22 28 
 
 Each 1.30 lJs~ ~"l.'49^ " 1.40 1.57 "2103 2^16 2^46 ^^70 2^9 
 
 Per dozen 12.96 13.77 14.85 14.04 15.66 20.25 21.60 24.57 27.00 28.89 
 
 Height, inches 24 36 12 18 24 
 
 Diameter, inches 7| 7^ 11^ 11'- 11-i 
 
 Capacity, pints 36_ 56 38 58 80 
 
 Each 3..32 4.32 5.13 6.48 8.10 
 
 Per dozen .33.21 43.20 51.30 64.80 81.00 
 
 Fittings for No, 30636 Jars. 
 
 Diameter, inches 2^ 'i] 5 GJ 7i 11' 
 
 30640. Lids, only, each 06 .10 .20 .28 .50 1.30 
 
 30644. Clamps, only, each 24 .30 .48 .54 .90 1.70 
 
 30648. Rubbers, only, each 05 .15 .35 .40 .60 1.40 
 
 30652. Jars, Museum, A. H. T. Co. Special Flat Top, with gound on lids of plate glass and with foot. The 
 great variety of sizes ofTered and low prices have resulted in a very wide use of these jars. The 
 foreign method of manufacture produces a jar of much finer appearance and finish and less sus- 
 ceptible to sudden temperature changes than corresponding ware made in the U. S. See follow- 
 ing import list for duty free prices and variety of sizes available on importation order. 
 
 Height, era 10 10 10 15 15 15 15 18 
 
 Diameter, cm 6 JiO_ 16 10 15 20 30 15 
 
 Each .35 .60 1.10 .75 1.05" 1.90 i^OO " 1.20 
 
 Height, cm 18 20 20 25 60 70 70 
 
 Diameter, cm 21 18 3q__ 25 15 10 15 
 
 Each 2.30 1.75 6.00 3770 05 376o 4.95 
 
 30652. Jars. Museum, A. H. T. Co. Special Flat Top, Import List. For the convenience of those ordering 
 Jars No. 30652 for duty free importation we give the following list of sizes available and dutv 
 free prices. 
 
 Height, cm 5 5 5 C 6 6 7 7 S 8 8 
 
 Diameter, cm 1.5 2 3 2 3 4 1.5 5 2.5 3.5 5 
 
 Duty Free, per 10 . . .55 .55 .60 .60 .65 "75 .60 .90 .70 .80 .95 
 
 Height, cm S 8 8 8 8 9 9 9 9 10 10 
 
 Diameter, cm 8 10 12 13 15 4 6 9_ 18_ 2 4 
 
 Duty Free per 10. . . 1.45 1.95 2.40 2.80 3.35 .90 J.20 1.85~ 5.30" .75 ^90 
 
 Height, cm 10 10 10 10 10 11 11 12 12 12 12 
 
 Diameter, cm 5 6 8 10 16 ^ 9 ^_ 3 4 5 
 
 Duty Free per 10. . . 1.15 1.15' 1.65 2.15 4.00 .'85 2.05 .75 .90 1.00 ~ 1.15 
 
 Height, cm 12 12 12 12 12 13 13 13 13 13 13 
 
 Diameter, cm 8 10 12 16 20 3 5 7.5 10 13 
 
 Duty Free per 10. , . 1.85 2.55 2.80 4.45 6.55 .95 1.30 1.55 2.05~ 2.55 3.35 
 
 Height, cm 13 13 13 14 14 14 14 15 15 15 15 
 
 Diameter, cm 15 18 28 __10 14 20 _25_ 2_ * _ 5 6 
 
 Duty Free per 10. .. 3.90 5.70 14^00 2.70 3.65 6.80 10.30' 1.00'~'l.05" 1.30 i;.55 
 
 Height, cm 15 15 15 15 15 15 16 16 16 16 IS 
 
 Diameter, cm S 10 12 1 5 2 30 10 15 16 20 3 
 
 Duty Free per 10 ., . 2.05 2.75 3.15 3.90 6.95 15.40 2.80 3.90 4.55 '6.95 1.15 
 
 Height, cm 18 18 18 18 18 18 18 18 18 20 20 
 
 Diameter, cm 4 5 8 _10 12^ _ A^__ ^^ -^ ^'^ --^ ■* 
 
 Duty Free per 10... 1.25 1.55 2.2.5' 3. 10 3.75 4.45 6^40 8..35 fLSO 1.20 1.25 
 
(Coiit.) 
 
 Height, cm 
 
 Diameter, cm.. .. . 
 Duty Free per 10 . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free per 10 . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free per 10. 
 
 Height, cm 
 
 Diameter, ciii. , . . 
 Duty Free per 10 . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free per 10 . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free per 10., 
 
 Height, cm 
 
 Diameter, cm .... 
 Duty Free per 10 . . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free per 10 . . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free per 10 . . 
 
 Height, cm 
 
 Diameter, cm 
 
 Duty Free per 10 , . 
 
 Height, cm 
 
 Diameter, cm 
 
 2{) 
 
 20 
 
 20 
 
 2.00 
 
 6 
 .75 
 
 20 20 
 
 30 3.5 
 
 .05 23.10 42.50 
 
 25 2.T 2.) 
 
 5 6 7 
 
 .05 2.10 2.40 
 
 1.55 
 
 20 
 20 
 
 10 
 3.80 
 
 4 
 
 2.15 
 
 30 
 
 2S 
 
 6_ 
 
 2. GO 
 30 
 
 2.90 
 
 30 
 
 2.60 
 
 3.25 
 
 30 
 
 35 
 
 30 
 
 3 
 
 31.10 
 
 2.10 
 
 35 
 
 35 
 
 20 
 
 25 
 
 35 
 30 
 
 15.50 29.75 42.00 
 40 45 45 
 5_ 8 
 3.35 5.05 
 50 
 
 30 
 52.50 
 
 50 
 
 12 15 20 
 10.90 15.50 24.00 
 
 60 00 70 
 
 2.90 
 30 
 11 
 
 5.60 
 
 35 
 
 
 
 3.3.5 
 40 
 
 3.10 
 
 45 
 
 50 
 15 
 
 19.00 27.,50 11.15 13.10 14.40 
 
 Duty Free per 10 38.00 18.15 
 
 10 
 20.60 
 
 20 
 
 20 
 
 20 
 
 "0 
 
 20 
 
 20 
 
 12 
 
 13 
 
 U 
 
 15 
 
 16 
 
 18 
 
 3.75 
 
 4.05 
 
 4.50 
 
 4.95 
 
 5.75 
 
 6.40 
 
 22 
 
 23 
 
 23 
 
 23 
 
 25 
 
 25 
 
 1) 
 
 6 
 
 12 
 
 IS 
 
 3 
 
 4 
 
 2.60 
 
 2.10 
 
 4.20 
 
 7.50 
 
 1.40 
 
 1.80 
 
 2a 
 
 25 
 
 25 
 
 25 
 
 25 
 
 25 
 
 lo 
 
 16.5 
 7.30 
 
 IS 
 7.85 
 
 20 
 
 25 
 
 30 
 
 5.90 
 
 9.90 
 
 13.65 
 
 24.65 
 
 2S 
 
 2S 
 
 28 
 
 28 
 
 30 
 
 30 
 
 10 
 
 12 
 
 16 
 
 20 
 
 3.5 
 
 5 
 
 4.75 
 
 5.60 
 
 7.S5 
 
 11.15 
 
 1.70 
 
 2.15 
 
 30 
 
 30 
 
 30 
 
 30 
 
 30 
 
 30 
 
 12 
 
 14 
 
 15 
 
 16 
 
 20 
 
 25 
 
 6.10 
 
 6.95 
 
 7.50 
 
 8.65 
 
 11.90 
 
 18.20 
 
 35 
 
 35 
 
 35 
 
 35 
 
 35 
 
 35 
 
 7 
 
 8 
 
 10 
 
 12 
 
 15 
 
 18 
 
 3.75 
 
 4.00 
 
 5.75 
 
 7.75 
 
 10.25 
 
 12.85 
 
 40 
 
 40 
 
 40 
 
 40 
 
 40 
 
 40 
 
 6.5 
 
 8 
 
 10 
 
 15 
 
 20 
 
 25 
 
 60 
 
 5 
 
 4..50 
 
 18.40 
 
 50 
 
 10.65 
 
 70 
 
 15_ 
 21.65 
 
 00 
 
 15 
 32.30 
 
 8.35 
 
 SO 
 10 
 
 11.85 
 
 80 
 12 
 
 10_ 
 J.90 
 
 13.95 
 
 95 
 
 16.40 
 
 100 
 
 8.60 
 50 
 
 4..55 6.45 8.70 
 
 13.20 
 
 80 
 15 
 
 18.60 
 100 
 
 _8_ 10 
 
 22.55 27^35 45.25 
 
 25.15 
 100 
 
 30660. Jars, Rectangular Museum, A. H. T. Co. Special, with flat ground on lids for permanent sealing. 
 Of heavy clear white gljiss of Gxtr.T. fine fini.sh^and annealing. Much superior to ,iars of similar 
 
 appearance which are gold at lower prices 
 
 list for duty free prices. 
 
 Height, cm 
 
 Width, cm 
 
 Depth, cm 
 
 Each 
 
 Height, cm 21 
 
 Width, cm 21 
 
 Depth, cm _10_ 
 
 Each 2,85 
 
 Plain finish only in stock. See also following import 
 
 1,15 
 
 12 
 
 13 
 
 15 
 
 16 
 
 20 
 
 20 
 
 '0 
 
 8 
 
 10.5 
 
 10.5 
 
 12 
 
 6 
 
 10.5 
 
 15 
 
 
 
 4 
 
 
 
 9 
 
 4 
 
 5 
 
 7 
 
 ,60 
 
 .70 
 
 .80 
 
 1.10 
 
 .75 
 
 1.20 
 
 r.75 
 
 26 
 
 20 
 
 30 
 
 37 
 
 42 
 
 45 
 
 46 
 
 21 
 
 15 
 
 20 
 
 25 
 
 10.5 
 
 12 
 
 ^5 
 
 16 
 
 4 
 
 IS 
 
 14 
 
 7.5 
 
 9 
 
 16 
 
 ,00 
 
 2.00 
 
 4.35 
 
 5.00 
 
 3.20 
 
 3.30 
 
 6.00 
 
 Jars, Rectangular Museum, A. H. T. Co. Special, Import List. For the convenience of those ordering 
 Jar.s No. 30660 for duty free importation we ^ivr a list of the sizes available and duty free 
 prices. These are furnished in two styles of finish, i. c, A plain, and B, with one wide face 
 ground and polished. 
 
ARTHUR H. THOMAS COMPANY 
 
 A 
 
 \}\k^V 
 
 
 
 E^ 
 
 t 
 
 
 (Cont.) 
 
 Height, em 10 10 12 12 13 1:1 14 14 14 
 
 Width, em 5 6 S 9 10. .o 13 9 10 11 
 
 Depth, cm 2.5 5 ,S 3 4 5 2.5 2 3 
 
 A, Duty Free, per 10 1..50 1.90 2.20 2.20 2.50 3.80 2.35 2.55 3.80 
 
 B " " " 2.30 2..55 3.65 3.80 4.00 6.75 4.00 4.20 6.95 
 
 Height, em 1.") 1.5 15 15 10 17 IS 18 IS 
 
 Width, em 10,5 14 1.') 30 12 20 8 12 12 
 
 Depth, cm _ ^ _ 10 9 7 4 2 6 
 
 A, Duty Free, per 10 "2.95 ^.80 "4.20 13.90 4.00 "9.70 .^TltF 4T0O 4.20 
 
 B " " " 4.35 7.15 7.60 22.90 7.60 15.75 5.25 6.95 7.15 
 
 Height, cm IS IS 20 20 20 20 20 20 20 
 
 Width, cm 22 40 6 10 10.5 12 12 13 13 
 
 Depth, cm 3 14 4 7 5 5.5 10 5 7 
 
 A, Duty Free, per 10 10.30" 30.00 2.S0 4.45 O5 4^4.5 SSS OS OS 
 
 B " " " 16.80 52.50 4.45 6.75 6.65 7.15 8.40 7.35 7.35 
 
 Height, cm 20 20 20 20 20 21 21 22 22 
 
 Width, cm 17 17 19 42 .50 10 21 7 10 
 
 Depth, cm 9 14 7 7.5 15 7 10 3 3 
 
 A, Duly Free, per 10 7.80 9.25 " 7.75 36.00 58.75 4.45 10.50 4.20 4.45 
 
 B " " " 13.65 15.15 14.95 50.00 90.00 6.65 17.65 6.30 0.65 
 
 Height, cm 24 25 25 26 20 26 26 26 26 
 
 Width, cm 24 10 20 6.5 15 15 18 21 21 
 
 Depth, cm 14 S 7 5 8 10 15 8 W 
 
 A, Duty Free per 10. 13.45 5.70 10.50 4.40 8.80 9.25 14.75"" 12.35 13.20 
 
 B, " " " 19.55 8.65 17.65 6.40 13.00 13.45 20.50 21.15 22.00 
 
 Heijtht, cm 28 28 28 20 29 30 30 30 30 
 
 Width, cm 10 19 20 9 15 10 10 17 19 
 
 Depth, cm 6 7 7-5 7 4_ _ 6 10 9 6.5 
 
 A, Duty Free per 10. 5.95 11.00 12.35 5.95 7.70 5.95 6.85 9..50 11.45 
 
 B, " " " 9.25 19.80 21.15 9.25 11.55 9.90 12.10 17.60 20.70 
 
 Heiglit, cm 30 30 31 33 34 35 35 36 37 
 
 Width, cm 24 25 29 16 28 15 20 12 12 
 
 Depth, cm 7-5 6 11 _ 10 _ IS 13 10 9 4 
 
 A, Duly Free per 10. 16^10 16.10 22.00 11.50 28.00 lG..5b 19.25 10.00 9.50 
 
 B, " " " 25.30 25.30 39.50 21.25 49.25 27.75 33.00 15.00 14.50 
 
 Height, cm 40 42 45 45 45 46 47 50 50 
 
 Width, cm 40 10.5 10 12 25 25 12 12 20 
 
 Depth, cm 25 7.5 7 _9 1.5 16 9 10 15 
 
 A, Duly Free per 10. 71.25 14.00 14.00 14.50 24.75 26.25 14.50^16.00 49.25 
 
 B, • 19.80 20.00 21.00 55.00 57.50 21.00 23.00 85.00 
 
 Height, cm 57 60 00 05 
 
 W4dth, cm 12 15 16 16 
 
 Depth, cm 4 15 1 3 11 
 
 A, Duty Free per 10 17.50 36.25 36.25 37.50 
 
 B, " " " 27.50 67.50 67.50 75.00 
 
 Jars, Rectangular Museum, of same quality and shapes as Ko. 30660 excepting that t 
 
 nishcd with glass foot and ground fiange or lip at the top, providing a broader su; 
 
 and a widened space for air tight sealing. Not carried in stock. 
 
 Height, cm 6.5 11 12 ' 13 20 21 25 27 35 
 
 Width, c;m 5.5 3,5 S 12 16 21 26 26 13 
 
 Depth, em 5 12 4 4.5 10 1 2 13 12 
 
 Duty Free per 10... 4..50 3.60 3.60 6.09 18.45 2L75 27..30 30.00 27.00 
 
 2.65 
 4.40 
 
 15 
 
 9 
 
 7.5 
 
 2.959 
 
 4.555 
 
 18 
 
 18 
 
 7 
 
 6.75 7.60 
 10.50 11.80 
 
 20 20 
 
 6.30 6.95 
 10.50 10.95 
 
 4.85 
 7.15 
 
 26 
 
 15.40 
 
 26.95 
 
 30 
 
 6.30 
 10.50 
 
 26 
 26 
 
 13 
 
 17.60 
 
 30.80 
 
 30 
 
 23 
 
 16.75 14.10 
 23.80 22.90 
 
 37 
 25 
 
 40 
 30 
 25 
 
 22.00 " 39.50 
 
 40.00 
 
 50 
 
 50 
 
 30 
 _ P_ 30 
 .57.50 75.00 
 103.75 
 
 65 S5 
 
 30 16 
 
 hey are fur- 
 pport at base 
 
ARTHUR H. THOMAS COMPANY 
 
 Jars, Specimen, Whitall-Tatuni Co., lA dear white {flasy, with extra wide iiiouth and glass stoppers 
 carefully ground ill. By special arrangement with the manufacturers we offer these Jars at 
 original factory prices. 
 
 Height, inches 2 3 2i 3^ 5 3J 5 7 4 6 
 
 Diameter, inches IV U '2 2 2 2j 2t 2-' 3 3 
 
 Capacity, ounces _!} 'Ih 3 5 6_ _S_ ll' J.6' _14 ^ 
 
 Each 16 .18' .19 .21 .23 .24 .27 .30 .32 .35 
 
 Per dozen 1.62 1.76 1.89 2.03 2.30 2.43 2.70 2.97 3.11 3.51 
 
 Height, inches S 6 S 10 5 S 12 7 10 12 15 
 
 Diameter, inches 3 3, 3f 3} 41 4' 4^ li 6 6 6 
 
 Capacity, ounces 2S 20 40 52 3S" 62' 92 OS _ 140_ 16S _212 
 
 Each 43 .46 .57 .68 .59 .73 .86 1.03 1.35" ' 1.46 1.67 
 
 Per dozen 4.19 4.59 5.67 6.75 5.81 7.29 8.64 10.26 13.50 14.58 16.74 
 
 Jars, Brain, of heavy, clear white glass, with trough or channel around rim into which cover fits 
 loosely. Can be made air tight by the use of glycerine, paraffin oil, etc., and are particularly 
 recommended for use as brain jars, or for other purposes where specimens must be readily 
 accessible and yet air tight. Not carried in stock. 
 
 Height, cm 15 15 15 20 15 20 25 30 
 
 Diameter, cm 15 20 25 25 30 30 30 30_ 
 
 Duty Free per 10 15.00 19.50 22.50 24.00 29.45 34.90 38.75 46.50 
 
 Jars, Dressing, of heavy white glass, with flat bottom, ground rim and loosely fitting cover. 
 
 Height, mm 130 180 
 
 Diameter, ram 65 80 
 
 Each .40 M 
 
 Jars, Dressing, of heavy white glass, with lid closely fitting on shoulder but not ground air tight, 
 with cut and polished knob. 
 
 Height, mm 100 120 150 210 260 
 
 Diameter, mm _100_ _ 120 _ 150 _ 2 10 260 
 
 Each 95 " 1.15 1.60 2.60 3.40 
 
 Jar, Dressing, nf heavy white glass, with foot and lid fitting looselv, without indented shoulder. 
 
 Heifjht. mm. . . . ." ". lOO "120 150 210 260 
 
 Diiuueter, mm 100 120_ ?:'^0__ 210 260 
 
 Each 75 .95 " 1.30 2.25 3.00 
 
 Jars, Specimen, of glass, with lid smoothly fitting but not ground air-tight. Knob in the lid is 
 countersunk so that jars may be readily stacked one on top of tlie other. Nearly air-tight 
 when rubber band is used. 
 
 Height 3| 4^ 55 6 Gi 7i 
 
 Diameter 6^ 61 8.', 91 10} 11^ 
 
 Capacity 1 1'^ _ __^ Pt._ 6 pt. ^ pt. 13_pt. 2 gal. 
 
 Each, plain 30 " ,35 .80 ' 1.15" 2.00 2.50 
 
 Each with rubber band 35 .40 .85 1.25 2.15 2.75 
 
 Jars, Specimen, with slight constriction at neck and lid provided with a rubber washer which renders 
 the jar partially but not entirely air tight. These jars are of clear flint glass, but not of such 
 fine finish as No. 30620 or 306.52. 
 
 Height, inches 7i- lOi IH 12^ 13^ 
 
 Diameter, inches 6i S.} 10^ 10^- lU 
 
 I Capacity, gallons J 2 3 4 5_ 
 
 Each.. 80 1.40 2.40 3.40 4.00 
 
Cdt* 
 
 J\rs Specimen with foot, slightly conHtrit^tcd iieuk and ground in atoptior. Highly finished. 
 
 H (,1 t mm. ... SO 100 120 1,30 ISO 200 
 
 Di netcr mm _J^_^ J^_ _ ^ ^^ _ ^ _ ^^ 
 
 Fach 25 .35 " ' .35 .50 .55 .75 
 
 J irs Uniform Specimen, with foot, slightly constricted neck anrl ground in stopper. These jars are all of 
 tl sin e height i. e., 145 mm, but of varying capacities and are widely used in chemical museums. 
 
 ( ]i(ity -c ■") 10 20 oO 1 00 12.5 
 
 Each 
 
 11 
 
 hit. 
 
 19.5 
 
 .20 
 
 1 Pt- 
 
 9 
 
 Hpt- 
 
 .50 
 
 1 qt. 
 
 1 qt- 
 
 35.5 
 14^ 
 1.00 
 
 2 gat. 
 
 Jars, Inverted Specimen 
 
 Height, cm. 
 
 Diameter, c 
 
 Each 
 
 Jars, Inverted Specimen, for cork stopper 
 
 Height, cm 9.5 
 
 Diameter, cm 4 
 
 Each 10 .13 .15 
 
 Jars, "Lightning," of greenish glass. Lid is clamped air-tight by spring clip. 
 
 Capacity -^ pt. 1 pt. Lji^____ 
 
 Each 12 .14 " .15 .16 -20 
 
 Per gross 9.00 10.00 11.00 12.00 15.00 
 
 Jars, "Safety Valve," of white glass. Improved spring clamp with rubber washer makes the jars ab- 
 solutely air-tight. 
 
 Capacity 
 
 Each 
 
 Per gross 
 
 Jars, Specimen, of white glass. 80-called "Jam Jars 
 
 spring clamp. 
 
 Height, mm 40 
 
 Diameter, mm 40 
 
 Capacity, cc 30 
 
 Each... 07 
 
 Jars, Specimen, with metallic screw cap. 
 
 Height, mm 
 
 Diameter, mm 
 
 Capacity, cc 
 
 Per dozen 
 
 Jars, Preparation, so-called "Ointment Pots." Of flint glass with metal screw caps lined with paraf- 
 
 fine paper to protect the metal from corrosive action of contents. 
 
 Capacity, ounces. I k _^ _ _ - '^ "* '^ 16 
 
 Each .. .05 .06 .OS ' .10 .12 .14 .25 .40 
 
 Per gross 4..50 5.45 6.95 8.85 10.50 12.40 21.00 36.00 
 
 .14 
 
 .Iti 
 
 .18 
 
 .20 
 
 .24 
 
 10.75 
 
 12.00 
 
 14.00 
 
 15..50 
 
 19.50 
 
 with covei 
 
 held ail 
 
 tight by 
 
 rubber 
 
 band and 
 
 70 
 
 .SO 
 
 100 
 
 150 
 
 120 
 
 05 
 
 75 
 
 75 
 
 70 
 
 100 
 
 125 
 
 200 
 
 250 
 
 400 
 
 600 
 
 .09 
 
 .10 
 
 .11 
 
 .14 
 
 .23 
 
 . 60 
 
 95 
 
 120 
 
 110 
 
 145 
 
 30 
 
 35 
 
 45 
 
 60 
 
 SO 
 
 30 
 
 60 
 .90 
 
 120 
 
 250 
 
 500 
 
 .80 
 
 1.25 
 
 1.83 
 
 3.00 
 
Jar^, Pretipildting, hti.nght cylindrical foi 
 
 Capacity, cc 125 250 
 
 Each 20 .30 .40 
 
 Jars Precipitating, conical or tapering form, with spout. 
 
 Capacity 8oz. Hioz. 32 oz. 5gal. 
 
 Each .20 .30 .55 .70 1.25 
 
 Jars, Stoneware, witli two handles and cover, rcpistant to chemicals and useful 
 
 Igal 
 
 2gal^_ 3ga[. 
 2.90 4.00 
 
 aboratories as 
 ■ilar purposes. Can be furnished on special order up to 50 gallons capacity, 
 value in comparison to their bulk, boxing is charged extra at cost. 
 
 Bec:n,-. . ■; 
 
 Capann. .:, 
 
 Height, inches 7f 9 IH 12J- 14^ 16i 18^ 
 
 Diameter, inches 7m .sV 12 12J 121 13^ 15§ 
 
 Each .40 .60 1.00 1.25 1.50" 1^75 2.50 
 
 Jars, Stoneware, low form. The sizes listed are frequently used for temporary preservation of speci- 
 mens in comparative anatomy. They can also be furnished on special order up to 50 gallons 
 capacity. With covers. Boxing charged extra at cost. 
 
 Capacit.y, gallons 4 
 
 Height, inches Sj 
 
 Diameter, inches 13 
 
 Each 1.00 ~i. 
 
 Knife, n convenient labo[;itor-\' knife for preparing potato cultures, parinir corks 
 
 r, 
 
 10 
 
 15 
 
 Id 
 
 12i 
 
 145 
 
 15 
 
 17i 
 
 19-; 
 
 2S 
 
 2.25 
 
 4.00 
 
 rti- 
 
 
 .20 
 
 No. ,HI7,5(; No. :;{<7i,t) No. 307G8 
 
 Labels, Dennlson, gamnicd, on white jinper with red border. 
 
 Number :J'J5 2L!3 217 213 209 205 201 
 
 Size, inches | x ^^ a ^ li li^ ^ In lA -^ 1 lA >^ U l-^ x 1| 2'- x 1^ 
 
 Number in box ^ 1"^ V^^ V-^ 100 100 75 ' 100 
 
 Per box 06 .06 .06 .06 .06 ~.m M 
 
 Per carton of 1 doz. boxes.. .50 .50 ..50 .50 ..50 .50 .50 
 
 Labels, Dennison, gummed, in books, white with red border and rounded corners, in sheets, perforated, 
 bound in book form. Size of book 9x5 inches, with 25 sheets in book. 
 
 Number 225 223 221 219 217 21.'i 209 205 201 
 
 Size, inches f x ^^ li x f ^ x t'« UxJ U x f ^- lA x f^- lA x H lH x liV 2^x11 
 
 Number in book.. . 1575 1400 1050 750 7 50 750 500 300 225 
 
 Per book 25 .25 .25 .25 .25 .25 .25 .25 .25 
 
 Carton of 6 books. . 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 
 
 Labels, Dennison, gummed, perforated, in rolls. Each roll is contained in a special box with slot 
 opening so that labels can be drawn out as needed without opening the box. Each roll contains 
 
 1000 labels. Number 221 217 209 205 
 
 Size, inches « >t it H x 1^ 1-^ x 1^ Ij-g x l^V 
 
 Per roll 45 .50 .65~ T70 
 
 Labels, Dennison, gummed, white with red border, large rectangular shape. Packed 100 in a box. 
 
 Number 2004 2007 2002 2001 2006 2005 2003 
 
 Size, inches 2^- x Ii V 21 x 1 S- 3f x 1-V 3^ x li^ 4 x Ij- A-?- x j 4-^x2 
 
 Per box .12 .15 .15 .18 " .IS .20 .22 
 
 Per carton of 10 boxes.. . l.Ofl 1.25 1.25 1.50 1..50 1.75 2.25 
 
3082 I 
 
 30770. 
 30780. 
 
 30784. 
 30788. 
 
 30792. 
 30796. 
 
 .30800. 
 
 30804. 
 
 30812. 
 
 .30816. 
 
 30828. 
 30832. 
 
 30836. 
 30840. 
 30844. 
 
 Circular. 
 ASS AS4 
 
 A.S.5 
 
 .15 
 
 .15 
 
 Rectangular. No. A18, size li x f 
 
 Labels, Dennison, gummed, on plain white paper without border. 
 
 Number A81 
 
 Diameter, inches -^ 
 
 Per box of 1000 JO 
 
 Labels, Dennison, gummed, on plain white paper without border. 
 
 inches. Per box of 1000 
 
 Label Book, containing the names and formulae of the most used chemicals and reagents. 
 
 on good paper, gummed and perforated and bound in book form. Per book 
 
 Ladles, of wrought iron, with lip, 4 inches in diameter 
 
 Lamps, Alcohol, of polished brass, with screw top and metal cap. 
 
 Capacity, ounces '2 i 
 
 Each 50 .60 
 
 Lamp, Alcohol, of brass, with wick; capacity 8 ounces 
 
 " " of glass, with base and ground on glass cap. \Vith wick and metal htting. 
 
 Capacity, cc 60 100 
 
 Each 40 .45 
 
 Lamps, Alcohol, cylindrical shape, of gias? with cap ground on. With wick and metal fittinK. 
 
 (.'apacity, cc 30 fiO 100 
 
 Printed 
 40 
 
 . .20 
 150 
 
 150 
 
 Each 35 .40 .45 .50 
 
 Lamps, Alcohol, cylindrical shape, of glass with cap ground on, nnd with side tubulation and glass 
 
 stopper. With wiek and metal fitting. 
 
 Capacity, cc GO 100 I.jO 
 
 Each .55 .60 .65 
 
 Lamp Wicking, a wick of any size is obtained by using the required number of strands. Per bundle. .05 
 
 Lead Shot, for cleaning bottles. No. 6. Per lb 10 
 
 LECTURE APPARATUS AS DESCRIBED BY HOFFMAN in his "Introduction to Modern Chemistry." The 
 more frequently required pieces only are listed but the complete set is q\ioted for importation upon 
 application. 
 Apparatus for the Decomposition of Water, with sliding, graduated glass tubes for the collection of gases. 
 
 With platinum electrodes 2.25 
 
 Apparatus, same as No. 30816 but on glass foot 2.75 
 
 Apparatus for the Decomposition of Water, with graduated glass tubes with ground in stoppers. With 
 
 platinum electrodes 3.50 
 
 Apparatus, same as No. 30824 but on glass foot 3.75 
 
 Apparatus for Decomposition of Water, with plain tubes with stopcocks, platinum electrodes, support 
 
 and binding screws 10.00 
 
 Glass Parts only for No. 30832, with platinum electrodes 6.00 
 
 Apparatus for the Decomposition of Water, similar to No. 30832 but with graduated tubes, on support 11.00 
 
 Glass Parts only for No. 30840, with platinum electrodes 7.00 
 
No. 30872 
 
 30S52. 
 30856. 
 
 30860. 
 30864. 
 
 30868. 
 
 30876. 
 
 30880. 
 
 30884. 
 
 30888. 
 
 Apparatus for the Decomposition of Hydrochloric Acid, Water and Ammonia 
 
 ;tnd siii)|>ort. 
 
 Glass Parts unly for iNo. 3l)N4S, with phu 
 Apparatus for the Decomposition of Water, Hydi 
 
 trodes and glass stopcocks, on .-iu|i]ini-t \v 
 Glass Parts only for No. 3f)sr>[\, with phit. 
 
 Linum electrodes 
 
 6.00 
 
 Hrudijs 3.00 
 
 Acid and .Ammonia, with two platinum elec- 
 
 11- srIPWv 10.00 
 
 6.00 
 
 Apparatus, same as No. 30S56 but with carbon electrodes 10.00 
 
 Glass Parts only for No. 30S64, with carbon electrodes ... 6.00 
 
 Note— The complete outfit for the decomposition of water, hydrochloric acid and ammonia consists of 
 two No. 30Kli4 connected wilh one No. 30856. 
 
 Lecture Eudiometer, with platinum electrodes, two stopcocks, one graduated arm and support. . 10.00 
 Glass Parts only for Xo. 30S72, with platinum electrodes 7.00 
 
 Apparatus for the Decomposition and Recomposition of Water, with platinum electrodes in middle of 
 
 tube, two glass stopcocks and support 10.00 
 
 Glass Parts only for No. 30880 with platinum electrodes 7.00 
 
 Apparatus for Demonstrating that Three Volumes of Hydrogen Combined with One Volume of Nitrogen 
 to Form Two Volumes of Ammonia. With platinuni nloctrodcs, two glass stopcocks and sup- 
 port 8.00 
 
 Glass Parts only for No. 30888, with i)1alinum rlrri inilrs 5.00 
 
 No. 30908 
 
 ■ become greasy and harsh. 
 
 .30896. Lens Paper, Japanese, for cleanlnt;- lenses, dues not easily collrct ■ 
 ll is \(Ty .soft, and free from impurities, 
 
 i<i7,c of sheet mm 185 x 275 275 x 275 
 
 Per package of 100 sheets .35 .65 ~ 
 
 .^0900. Level, of brass, 4 inches long ,50 
 
 30904. " round, in brass case; for balances, bacteriological work, etc.; 30 mm diameter 2.00 
 
 30908. " " " " " nickel plated ; 15 mm diameter 65 
 
 30912. Liquid Air Apparatus, Olszewski, Demonstration Model, \rransied fitr the liquefaction of air only. 
 Simple model for lecture table work with a capacity- nf Kill re i,\' lii]i;id air in .'i or 10 minutes 
 when operated with cylinders of 13 liter capacity urMln- rnnipn-s.sidn (if l.'>ll l<i 200 atmospheres 
 pressure. With two i3 liter Steel Cylinders. See iiiu.-^tralifm mi ioiiowinL; pagr. 
 
 Duty Free 175.00 Duty Paid 245.00 
 
 30916- Liquid Air Apparatus, Olszewski, Technical Model. With apparatus entirely enclosed in nickel plated 
 jacket. Ca|>acity 1 liter of liquid air ]ior hour when used in connection with a 7 h. p. Whitehead 
 Without Compressor. 
 
 Coi 
 
 Duty Free 287.50 
 
 Duly Paid 402.50 
 
ARTHUR H. THOMAS COMPANY 
 
 .(7| 
 
 
 M^ 
 
 1 ' ' 
 
 
 '"': 
 
 
 
 
 
 
 
 i 
 
 |il 
 
 r 
 
 No. 30812 No. 3091b No. 3092U 
 
 References :—K. Olraewski, "Vt-rau^siguns d.-y Wasaerstoffs hni Vermeiduag von Kulte-Verlusten," Zeitschrift fiir koiii|ii 
 und flussi^e Gase sowic fur die Preasluft-Iiiduatrie (XIV, Jahrgang). 
 
 K. OI.MOW3ki, "Dii! Vurflusaigun? der Gase," Bulletin des Sciences de Craoovie, Maiheft 1B03. SLtzung vom 4. 
 
 30920. I/Kiuid Air .\pparatus. Olszewski, Universal Type. 
 
 Fur liydroguu and other gases, latest im- 
 proved model. rnp;u'ity 1 .:> lilprs of liquid 
 air per hour wju'u upn-itnl ■/.itli ;i White- 
 head Compres^nr uf 7 li. p. ( iq,:, fit y of hy- 
 drogen 1 liter |jcr liuui with ihe siicnc sized 
 C'nmpres.sor. Wiltiuul ( 'oiupressor. 
 Duty Free . . 575.00 Duty Paid... 805.00 
 30924. Thermostat for Low Temperatures, Olszewski, 
 range from to -190° C. For use with liquid 
 air or other liquified gas as cooling media. 
 Duty Free ... 325.00 DutyPaid, .. 455.00 
 
 30928. Compressor, High Pressure. Whitehead, suitable 
 for both air nn'\ hydroy:i'Ti Imt not for work 
 with o\>'gen, require^ 7 h. ]). for attaininga 
 final pressure of 12U0 kUograms per cubic 
 centimeter; to be operated at 350 r. p.m. and 
 with a loose pulley for power driving. 
 Drawing wiMi dimensions and other details 
 upon :ip|ili' ,ii :<ii As furnished by us to the 
 Palnirrl'l ■■ ■■■.' I iiinratory, Princeton Uni- 
 versii \ .'■' ■ i direct connecting elec- 
 
 tric niOli.H Dll li qllt.'^t. 
 
 DutyFree... 885.00 DutyPaid... 1062.00. 
 
 Note — Reprints in German descriptive of the above 
 apparatus on appiication. 
 
ARTHUR H. THOMAS COMPANY 
 
 .08 
 
 .10 
 
 .35 
 
 1011 
 .15 
 
 .Ni.. :Hia4.^ No. 3«95fi 
 
 3im2. Magnets, Bar, of stocl, ix-st (nihility. Leiifitli, mm.. 
 Each 
 
 .3093(i. Magnets, Horseshoe, with ariiiatiiro. Length, mm.. 
 Each..." 
 
 30940. Mattrasses, of hard Buhemian glass, for blowpiping. 
 
 30944. Magnifiers, Pocket, Oval Shape, Single Lens. Mounted in best quality vulcanized rubber, durable, 
 lipht weight and of neat appearance. 
 
 Nmnhor 50 56 52 6S 74 7S 
 
 Long Diam. in Indie? } 1 li U U 2 
 
 Vuwv 5 X 4 X 3.5 X 3 X 2.5 X 2 X 
 
 Each 35 .45 .55 .70 .85 1.00 
 
 30948. Magnifiers, Pocket, Oval Shape, Double Lens. Otherwise same as above. 
 
 Number 51 57 63 69 75 79 
 
 Lens Diam. in Inches.. . f, f i, 1 U, U H. U IJ- U U, 2 
 
 liange of Powers 5 to 12_X 4 t o 9 X 3 . 5 to 8 X 3 to 6 X 2.5t.o5X 2 to 4 X 
 
 Each ' .50 .70 .85 1.00 1.35 L70 
 
 30952. Magnifiers, Pocket, Bellows Shape, Single Lens. Otherwise same as above. 
 
 Number 101 110 119 
 
 Lens Diam. in Inches. . i i 1 
 
 Power ;^X_ _ 4^X_ 4 X 
 
 Each 35 " .40 .45 
 
 30956. Magnifiers, Pocket, Bellows Shape, Double Lens, "thcrwise same as above. 
 
 Number 102 111 120 
 
 L('ng Diam. in Inches I, I hi s. 1 
 
 liangc of Powers 7 t o 15 X 4 to 9 X 4 to 9 X 
 
 Each .50 '"".60 .70 
 
 -30960. Magnifiers, Pocket, Bellows Shape, Triple Lens. Otherwi.se same aw above. 
 
 Number 103 112 121 
 
 Lens Diam. in Inches i. m, I 1. f , s h h ^ 
 
 Range of Powers 7 to 30 X 4 to 20 X 4 to 20 X 
 
 Each .70 .85 1.00 
 
 30964. Magnifiers, Pocket. Nickel Mounted, Single Lens. Differ from preceding in mounting which is of 
 metal. Simjilx- ron.strurted ;ind iittrai'tively nickeled. Furnished only in bellows shape. Lenses 
 of same quality and raii^i' as those in vulcanite mounting. 
 
 Number 101 NK HONK 119 NK 
 
 Lens Diam. in Inches 4 i U 
 
 Power 7 X 5 X__ 3.5 X_ 
 
 Each .50 .55 .65' 
 
 30968. Magnifiers, Pocket, Nickel Mounted, Double Lens. Otherwise same as above. 
 
 Number 102 NK 111 NK 120 NK 
 
 Lens Diam. in Inches i, j 1, 1 Ig, li 
 
 Range of Powers 5 to 12 X 4 to 9 X 3 to 6 X 
 
 Each .70" .80 " .95 
 
 30972. Magnifiers, Pocket, Nickel Mounted, Triple Lens. Otherwise same as above. 
 
 Number 103 NK 112 NK 121 NK 
 
 Lens. Diam. in Inches *, J. I !> li 1 1|, H, li 
 
 Range of Powers 4 to 20 X 3.5 to 17 X _ 2.5 to 9 X 
 
 Each 1.00 1.20 " 1.35" 
 
Nos. 17,'ta. 172. 171a Nos. 173. 172, 171, 170 No. 30980 No. 30980 
 
 No. 30988 No. 30988 Nos. 163, 162. 161, 160 Nos. lG3a, 162a, 16Ia, 160 
 
 30976. Magnifiers, Doublet. Good lenses ;it a very muJeiMti- fost. Consist of two sep;irated, piano conve.v 
 lenses. Nos. 1, 2 and 3 are niomiteil fur dissecting microscopes, No. is a hand magnifier with 
 hexagonal handle and No. 7 and 7a have folding pocket cases. 
 
 Number 1 2 3 7 7a 
 
 Focus in Inches . H 1 * 'i i I 
 
 Power 7 X 10 X U X 14 X j^X 12 X 
 
 Each 75 .75 .75 .75 1.00 1.00 
 
 30980. Magnifiers, Coddington. Give a good definition and a wide field. Composed of a cylinder of glass 
 with a deep groove cut in at equal distance from ends to serve ;is a diaphiatrin; ends of cylinder 
 ground spherically and polished to form lens surfaces, Xn-. 1U:Jri. lfi-:i, hihi. liiUa are mounted 
 for use in dissecting microscopes, and Nos. 163, 1<J2, lill , U',i) jn luldms; pin-kcT i;iwes. 
 
 Number 163a 162a 161a lG();i ]i>-; li;_' 161 160 
 
 Focus in Inches. . . . l^ 1 f i \] 1 f i 
 
 Power 7 X 10_X _ _ 1-1 X 2q_X 7 X _ 10_X _ 14 X _ 20 X 
 
 Each 1.25 1.2.5 1.25 1.25 " L.ifl I..1O " l.oi) 1.50^ 
 
 30984. Magnifiers, Triple Aplanats. High l:i:l<1'' m.i-inli.'i v.iih bir,..- n.'M .■umI pitI.t-i -■,,, i ,.rr i,,., fi)r chro- 
 matic aberration as well a^^ ll 1 ; ■ ■ 1 1 1- ; 1 I. ■ 1 ■ 1 1 . ■ r .■ 1 ■ ■ I -. Lined for 
 highest grade vi'ork. Compe^' I m , , 1, m.'i.i . , ■ h -i-.' ■ I l.'H _. ■-■ .-]■.:. '■■I ]■■■ ■,■■]■■.'■ ninvex 
 lens of crown glass. Nos. 16s... li^T.i, H'lU.i. Ui-3.( i.i>' iin..nil- d liri i.^i iw ii,,-..>rri ini^ ii.K-roscopes 
 and Nos. 168, 167, 166, 165 in folding pocket cases, 
 
 Number 168a 167a 166a 16r>a ]6S 167 166 165 
 
 Focus in Inches I3 1 f ^ I3 1 i § 
 
 Power J\5 X 10 X 15 X_ 20 X 7.5 X 10 X 15 X 20 X 
 
 Each 3^50 3.50 3.50 " 3.50 3.50 3.50 3.50 3.50 
 
 30988. Magnifiers, Hastings Aplanatic Triplet. With a very hirge angle of view and corrections of a high 
 order. Nos. 173a, 172a and 171a are mounted for use in dissecting microscopes and Nos. 173, 
 172, 171 and 170 in folding pocket eases. 
 
 Number 173a I72a 171a 173 172 171 170 
 
 Focus in Inches I5 1 f li 1 I i" 
 
 Power 7.5X lOX 14X 7 X 10_X U_X 20 X 
 
 Each 7.50 7.50 7.50 7.50 7.50 7.50 7.50 
 
 1^ 
 
 •,"0. :)II992 No. 3099fi 14-lA No. 309% lJJ-2 No. 3oa9(i 14IL1' No. 31(101) 
 
 Magnifier, Tripod. Used for elementary biological work and dissections. Lens mounting screws up 
 
 and down in brass frame for focusing. Diameter of lens one inch, power 7.5 X 35 
 
 Magnifier, Watchmaker's. Easily held in orbit of the eye; No. 144LP has detachable spring to pass 
 around the head. Lenses furnished in two different diameters (sizes 2 and 3), with same eye 
 opening in each case. No. 144A fitted with two lenses, one removable to give two different mag- 
 nifying powers as indicated below. 
 
 Number 144-2 144-3 144| 144-2 LP 144-3 LP 144.\ 
 
 Lens Diam. in Inches 1 H 2 1 li 2,1 
 
 Range of Power 2 to 10 X 2 to 5 X 10 X 2 to ^ X 2 to 5 X 4 to 10 X 
 
 Each .40 .40 .40 .55 " .55 .60 
 
 Magnifiers, Engravers' Glass. Designed for engravers, carvers and die cutters, also available for 
 biological work, retouching and use as condensers because of their large clear field. Nos. 146-148 
 made with two plano-convex lenses giving flatter field and better image than one lens. All 
 styles in vulcanized mountings. 
 
 Number 146 US 146A 148A 
 
 Lens Diam. in Inches Is 2J Ig 2^ 
 
 Power 3.0 X 2.5 X 3,5 X 2.5_X 
 
 Each 1.50 2.50 .75 1.25 
 
 2S7 
 
No. .'ilUlU No. 31(I0S No. ;;1U12 
 
 31004. Magnifiers, Linen Testers. Inteoded priduinly fur cuiiiitins tlircjida in cloth, hul. used for beginners' 
 
 cla.-swi.'a and various other magnifying purpose.^. Mounting hinge to fold up compactly when not 
 
 in use. Number 141 141^ 1^2 143 143§ 
 
 Openings in Inches 1x1 ^ x I t x h i^i Q \ f^ia. 
 
 Power 7 X 10 X ^10 X 10 X 1 X 
 
 Each ~2M .45 .45 .45 .45 
 
 31005. Magnifier, Cloth Counting Glass, with base divided into spaces of i, I and 1 inch and the space be- 
 
 tween the ! and I inch mariis divided into 10 mm. With focusing eyepiece with pointer attached 
 which traverses the whole scale by means of quick acting screws. In leather covered case. . . 7.50 
 31012. Magnifiers, Reading Glasses. Regularly furnished with nickel rim of sufficient width to protect 
 lens surfaces and with handle of ebonized wood. 
 
 Lens Diam Inches 2 2J- 3 3^ 4 4^* 5 5^ 6 
 
 locusmlnhe _S 6 7 S 10 12 J3 14_ J5 
 
 Each .60 .80 I^~ ~r50~~ 2m~ 2.25 2.50 3^00 3.50 
 
 ^ll l.;i'illi:.|i::.;iiiitBii:^^ 
 No. 31020 
 
 Duly Free 
 10.00 
 
 8.75 
 
 Slock 
 
 12.40 
 
 10.85 
 
 MAGNIFIERS, ZEISS ANASTIGMATIC COMBINATION LENSES 
 FOR DISSECTING, ETC. These excellent combinations 
 are to be recommended particularly because of a compara- 
 tively large field of view, e.xcellent definition and remarkably 
 long working distance, and are furnished in simple mount 
 ^■1 for use in a dissecting microscope, handle and lens ring, or 
 
 small tripods, as well as in single and double folding pocket 
 cases. The Briicke system is designed especially for dis- 
 secting with the Mayer Dissecting AJicroscope and the sys- 
 tems may be used separately as simple magnifiers or with 
 the ocular for greater magnification. To secure the best 
 results with all simple magnifiers the observer should place 
 the eye as near as possible to Ihe magnifier. 
 Dissecting Combination Lens, Briicke, giving powers of 11, 17, 30, 40, 60 and 100 
 diameters w ith the different combinations used singly or with the ocular 
 
 lens 
 
 Dissecting Combination Lens, Briicke large, with lens of a free aperture of 25 
 mm, ijower 5 to 10 diameters, with working distance from 60 to 70 mm 
 
 and cuvcring field from 7 to 13 mm in diameter 
 
 Magnifier.s. Anastigmatic, in simple mount, for use on dissecting stands or in 
 small tripods, etc. 
 
 Magnification 16 X 20 X 27 X 
 
 Diameter of field of view, mm 10 S 6 
 
 Free working distance, mm 9 7 55 
 
 Duty Free 5. .50 
 
 Stock 6.82 
 
 Magnifiers, Anastigmatic, same as above but in single folding mount. 
 
 Magnification 16 X 
 
 Duty Free 6.25 
 
 Stock 7.75 
 
 Magnifiers, Anastigmatic, same as above hut in double folding mount. 
 
 Magnification 10 X an d 20 X 1 6 X and 27 X 20 X and 27 X 
 
 Duty Free " 10.50 " 12.00 12.00 
 
 Stock 13.02 14.88 14.88 
 
 Plankton Magnifier, Kolkwitz, a special magnifier of 40 diameters, very useful in field work, giving a 
 field of view 2 mm in diameter with a free working distance of 3 mm. This magnifier has a nu- 
 merical aperture of 0.27. See R. Kolkwitz, "Entnahme-und Be.ohachtungsinstrumenle fiir biolo- 
 gisckc Wasseruntersuchungen." Mitteilunq mts der koniglichen Prufungsanslalt fur Wasserver- 
 sorc/nna zv Berlin, 1907, Heft 9, . 1S6 and 127. pp. 
 Duty Free 12.00 Stock 14.88 
 
 ens ring with handle, 
 
 5.50 
 6.82 
 
 5.50 
 6.S2 
 
 20 X 
 6.25 
 7.75 
 
 27 X 
 6.25 
 7.75 
 
ARTHUR H. THOMAS COMPANY 
 
 if jj'L^ r,{^=^ 
 
 Magni 
 31040. 
 
 31044. 
 
 31048. 
 
 31052. 
 31056. 
 31060. 
 
 31064. 
 31068. 
 
 Nn. 31060 No 31 " I 
 
 fiers, Zeiss Anastigmatic Combination (Continued). 
 
 Magnifier, Low Power, for use either ia handle or on lens stand as listed bel; 
 
 of 2i diain- 
 2.80 
 
 eters, field of view 100 mm in diameter and free working distance of 100 mm. 
 Lens Ring, without handle, for use with either of the Brlieke systems when same are to be used in 
 
 combination with lens stand 50 
 
 Lens Ring for Anastigmatic Magnifiers, in plain mount, for use in connection with handle or lens 
 
 stand -50 
 
 Handle, only, for use with above Lens Rings; illustration shows ring in position in handle .50 
 
 Tripod, with ring, to take any of the three Anastigmatic Magnifiers in plain mount 1.00 
 
 Lens Stand, adjustable, for use with either the Briicke combination dissectins systems or the Anastig- 
 matic Magnifiers in plain mount in combination with the necessary rings. Illustration shows 
 
 larce Briicke dissecting system with ring in position. 
 
 Duty Free '. 3.75 Stock 4.65 
 
 Lens Stand, adjustable, with hinged joints and rack and pinion adjustment, without lens or ring. 
 
 Duty Free lO-OO Stock 12.40 
 
 Object Holder, Wolf, designed expecially for Kntomology and for use with Anastigmatic Magnifiers in 
 
 double folding case and with lens stand No. 31064. Price does not include the double magnifier 
 
 shown in illustration but does include cork pinning blocks of three different shapes. In leather 
 
 case with space to accommodate magnifier. 
 
 Duty Free 8.00 Stock 9.92 
 
 31072. Manometer, consisting of glass U tube on wooden support, with scale. Without mercury 2.00 
 
 3]076. " Bennert, with glass stopcock and movable scale engraved on wood. Without mercury, 5.00 
 
 31080. " " with movable scale engraved on glass. Without mercury 6.00 
 
 Note— When desired the Manometers No. 31072, 31076 and 3I0S0 will be shipped filled with mercury at 
 customer's risk, with the cost of mercury added at market price. 
 
ART 
 
 HUR H. THOMAS COM P A N Y 
 
 '!'■: +. -' _FJjJlJ» •iilMlillBii 
 
 HI 7 S '.|l 10 33 3:4 25'3'n_27 3 S 2'Q 3'0 
 
 31088. 
 .11092. 
 
 .31112. 
 31110. 
 31120. 
 
 31128. 
 311.32. 
 
 311.36. 
 31110. 
 
 ^:s:. 
 
 \J'/" 
 
 IManometer, Differential, Konig. 
 
 btjndarrl phenol 
 
 /;. !89 fir Chnnil-vr-Ztnlinuj I'^.R: 
 Gauge, Segcr Draft 
 
 (Intfts in fiurs, 
 Manometer, fur \m-.\ 
 
 t »^^-«— . -I 
 
 For measurements up to '^U n n cf viter pre'^sure ^\lth bottle of 
 Spp Lunge, Chemi ih trckntiche I ntersuchungs methoden, 5. Aufl., 
 
 1r. 
 
 
 .■itd ■ 
 
 itl, i.M 
 
 5 door. . 
 measuring 
 
 3I00G. Rule, Boxwood. 
 
 12 i 
 
 radii 
 
 18.00 
 
 the difference of 
 
 8.00 
 
 rni!; \'<-\-y simlii ■ hlln .in i .-■ in |inssnir, .is in the determination of the specific 
 
 ■, See Zciticltr. fiir plty^. nml. rheni. Untcrrichl 1905, p. 199 6.00 
 
 MEASURING APPLIANCES 
 led on one side in millimeters to 30 centimeters, on the other in gth inches to 
 
 .20 
 
 Rule, Celluloid, 6 inches long, in both metric and English, with comparative Centigrade and Fahren- 
 heit thermometer scales on the back. A convenient vest pocket rule for the laboratory work .05 
 
 Rule, Steel, with English and mcli-ic .sr^iKs, <i,r:Ldii;Ltcd on one side to 5 millimeter and |, ^, ■^, and^th 
 inehe.s; and on the other to I'lT. i'_. j'.. ■ ■ 1' ■ .'.■ ,',. ^md yjjj inches. Length 6 inches (150 mm) .75 
 
 Meter Stick, with brass bound cnd.-^. ;;r:iiiii;iiiil in inctrii' system on one side and in inches on the other .50 
 
 Meter Stick, as above, plain, i. e. without brass bound tips 25 
 
 Half Meter Stick, exactly the same as above but only J meter long, with metal tips 30 
 
 Ituie, liildiii^ I'idiper, of boxwood, graduated on one side in millimeters and on the other in i^^th inches. 
 
 Length (unfolded) inches 6 12 
 
 Each 
 
 Rule, Decimeter, Steel. 
 in centiineUTs .■iml 
 metal bound U-:ii li< 
 
 Caliper Rule. ])nrkr( Int 
 and !■;. Jnrli.-. \ < 
 
 Micrometer ('aiiper. nick 
 
 ing between jaws. 
 
 Each 1.75 2.00 2.25 
 
 Micrometer Caliper, B. & R. American Standard, 1 inch reading to Tri'r7,)th of an inch 5.00 
 
 " ■' same as No. 31136 but reading to li'mth of a millimeter 5.OO 
 
 30 .50 
 
 mr dciiiticter long, one centimeter wide, one millimeter thick and graduated 
 iiiilliiiieters. Volume is 1 cc and weight in grams is the specific gravity In 
 
 '• l""-l-^''f ■■■■■^^: ■■■■■ 25 
 
 11, (tl pnh.-'i' ■! !■■ I ■■ ■ ■■.lib both English and metric scale up to 6 centimeters 
 
 '■V rn(i\v II ■ I I M,i,,tnry work. 50 
 
 ■I |ila1cd. ;.:r,i|:i:ii..l in i ,',-jjth millimeter. Sizes given are the maximvun open- 
 Scale, from to, mm 10 l,-) 2O 
 
31144. 
 
 :m48. 
 
 31152. 
 
 31156. 
 31160. 
 
 31168. 
 31172. 
 31176. 
 
 31180. 
 31184. 
 
 Micrometer Caliper, for meaanrin;: 
 in measuring glass or metal 
 
 Micrometer Caliper, roller form, i 
 Reading in --.('niths of an inrl 
 
 Micrometer Caliper, dial form witJi 
 
 w uf tubing walls to ,',, iiini. iaiticulail; (.■ouvenu^nt 
 y and with accuracy. Range from iV to 10 mm. .5.00 
 Iff the thickness of sheets of rubber, cloth, paper, etc. 
 
 uf an inch 20.00 
 
 •tefl box, reading on the dial to n^rtth mm; very convenient for 
 
 measurement of cover glasses in the laboratory, diameter of small wires, etc., in both laboratory 
 and shop practice 12.00 
 
 Micrometer Caliper, as abovr, hut r'\i(iiiiLr {•> , ,,',Hith of an inch. 15.00 
 
 Vernier Caliper, for both insicie ami nni.-^ido ni'';isur!ng. Of steel, graduated in millimeters to 10 centi- 
 meters, with vernier reading in ;',,! Ij uiilliuieter 1.50 
 
 Vernier Caliper, of steel, graduated in niilliiuclci's and inches, 20 centimeters long, with vernier reading 
 to ^th millimeters 2.00 
 
 Cafiper, plain, of steel, for inside and outside measurements 60 
 
 " with graduated measuring arc, readinginmillimeters to80mm and in^thinches toSinches 1.75 
 
 Measuring Cones, of .'^toel, nickel plated, for measuring holes, graduated to ^th millimeter. 
 
 .Scale, TiiTii l^to 15 
 
 Each ~1.00 
 
 Tape Measure, Linen, with English and metric graduations. In nickel plated case with spring 
 Total length, meters 1 
 
 Each _ .-■■.-:■. -. -25 
 
 Tape Measure, Steel, with metric divisions on one side and English on the other. In Germa 
 case with spring. Very convenient in laboratory work. Total length, meters, . , 1 
 Each 
 
 15 to 30 
 1.50" 
 
 2 
 .40 
 
 n silver 
 2 
 
 i.ob 
 
 .1 
 
 pr_gj_ 
 
 nr 
 
 Micrometer Microscope, a mtasurmg dcMce tor U'^e in (alibriting oi \Lut\'Uig theimometer scales 
 etc., or as a comparator. With two microscopes mounted on horizontal carrier, each with micro- 
 meter fine adj ustment and one with Fraunhofer ocular micrometer. Reading by means of Fraun- 
 hofer micrometer to -,,',,r millimeter. 
 Duty Free 84.00 Duty Paid lO.j.OO 
 
ARTHUR H- THOMAS COMPANY 
 
 Micrometer Measuring Machine, Model of 1010, for actual as well as comparative measurements, 
 reading by comparison to an accuracy of , u\ii,th of a millimeter and giving absolute value meas- 
 urements to ,„■'„„ of a millimeter; total length which may be measured 300 mm, with centering 
 device. This instrument is of great value in shop and laboratory practice where great accuracy 
 is desired. Larger models measuring up to 2 meters quoted on application. 
 Duty Free 480.00 Du«y Paid 600.00 
 
 Micrometer Microscope, Fraunhofer, measuring a total length of 20 mm and readingto tJjj of amil- 
 liiiK'tcr. Mounted on tripod with axis so that same may be used vertically (Fig. a) or horizon- 
 tally ( Fig. b). The tripod i.s folding and the whole is mounted in a neat wooden case. 
 Duty Free 84.00 Duty Paid .105.00 
 
 Microscope, Measuring, with vertical and horizontal scale on silver reading to iiruth millimeter. 
 The vertical and horizontal scales are 16 cm long and are both actuated by rack and pinion. The 
 microscope rotates in a vertical plane and may be clamped in any position. The horizontal 
 and vertical positions of the microscope are definitely marked. A glass micrometer scale is 
 placed in the common focus of the eyepiece and objective and serves to measure very short dis- 
 tances without moving either slide. By substituting a telescope objective the instrumentmay 
 be used as a reading telescope or as a short range cathetometer. With one ocular, a 2 inch micro 
 objective and extra telescope objective. 
 Duty Free 54.00 Duty Paid 68.40 
 
 Kxtra Micrometer Eyepiece for above, reading to M,'„,ith of a niillinieter. 
 
 Duty Free 2.'».M Duty Paid 32.30 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 3120S 
 
 31208. Micrometer Microscope, or Comparator, for the most accurate measurement of spectrographic negatives 
 and other measurements of great accuracy. The separation of two spectral lines, for instance, 
 is measured by direct comparison to a small scale on the speculum metal, the coefficient of expan- 
 sion of which is equal to that of the plate itself; reading by means of Fraunhofer micrometer in 
 the ocular to ^qVo millimeter, which diminishes the error of the thread 5th. Particularly rec- 
 ommended for rapid measurements as the screw carrying the stage or table is immediately 
 disengaged and its position changed. 
 
 For measuring over, cm 9 x 12 13 x 18 
 
 Duty Free 321.60 480.00 
 
 Duty Paid 402.00 600.00 
 
 Micrometer Microscope. Hilger, 1913 Model 
 
 embodying the following modifications — 
 
 The mirror mo»ea with the lrH*elling microscope. 
 The milled head far turning the screw has been 
 
 replaced by a handle. 
 The standards which support (he slide and eubstage 
 
 arc so designed that the aii» ot the microscope 
 
 is sloped towards the observer. 
 A vernier has been added, reading to 0.001 mm. 
 
 Though specially designed for rapid and 
 accurate measurements of spectrum 
 photographs, this instrument can be 
 used with equal advantage for any of the 
 accurate length measurements needed in 
 a laboratory. With the aid of the 
 handle now provided, one can pass 
 rapidly over the whole range of motion, 
 while at the same time the large drum- 
 head enables measurements to be taken 
 to 0.001 mm. The base is of cast iron 
 and the microscope slide is mounted on 
 two cast iron standards of such shape as 
 fo form convenient handles for moving 
 the instrument. 
 Length of horizontal motion, inches 
 
 Duty Free 164.70 
 
 Duty Paid 225.70 
 
 197.10 
 270.10 
 
ARTHUR H . 
 
 THOMAS COMPANY 
 
 No. 312lli No. 31216 
 
 MICROSCOPE, MEASURING AND SCREW TESTING, LARGE MODEL. This instrument has been designed 
 to give absolute measurements of small objects to a very fine degree with extreme accuracy. It is 
 particularly useful for measuring and checking such articles as micrometer screws, divided scales, 
 standard gauges, dies, etc., and is constructed for great ease of manipulation in such work. It is 
 designed to give the length and pitch of a screw to .001 mm, the maximum, minimum and effective 
 diameters and depth of thread to .01 mm, and the angle of the thread to 5' without the necessity of 
 moving the screw after it has been once set up for examination. 
 
 The object, according to its shape, is either held in one of the chucks. A, of the rotating, divided 
 holder, B, or fixed on the stage and its length measured by moving it across the field of the webbed 
 ocular, P, by means of a micrometer screw with a divided head, C. The pitch of this screw is .5 mm 
 and the head is divided into 100 parts; the fractions of these divisions are read from a vernier to Wdu 
 ram or ^.i^?,,,-,, inch. Entire millimeters are shown by an index on the scale, D. The plate of the stage 
 is held against the flint hard point of the screw by two long spiral springs set in the same plane as 
 the dove-tailed fittings, one on each side equally displaced. The point of the screw is turned on a 
 separate piece of steel to the thread; it is hardened, ground and polished, and let into the main piece 
 before the thread is cut. This is done to prevent distortion of the thread which would occur if the 
 hardening were done after cutting. The screw, which is of the most accurate description, is cut be- 
 tween dead centres with a single point. 
 
 The width of an object is measured by moving it across the field by means of the milled head, 
 F; the amount of the traverse is read to .01 mm by the scale and vernier, G. 
 
 The angle between two lines, edges, sides, etc., as, for example, the angles of a screw thread, is 
 ascertained by rotating the webbed ocular. One of the webs is brought coincident with a side and the 
 milled head of the tangent screw, H, is turned until the web coincides with the other side. The angle is 
 given on the scale and vernier, K, to 5'. 
 
 The milled head, L, actuates a tangent screw which inclines the object under examination to the 
 optic axis; the degree of inclination is read to 5' by the scale and vernier, M. _ As the object lies in 
 the same plane as the axis of rotation it does not go out of focus on being inclined. When the pitch 
 of a screw is being measured the screw should be inclined the same number of degrees as the angle 
 at which the thread crosses it; this angle can be approximated or else measured accurately by means 
 of the circle attached to the ocular. 
 
 The object is focused by fin ordinary rack and pinion coarse adjustment and a micrometer screw 
 fine adjustment; thf tnillrri hr-ad, N, of this latter is divided to read direct to .01 mm. This divided 
 head is of use in ol II ii:i_ ili coiTect position for viewing the profile of a screw thread. To effect 
 
 this, the top of tin.- i . ■ ■ used on the cross-wires of the ocular and the body is lowered by 
 
 means of the fine ailjn.-i mrru. an amount equal to the secant of the angle through which the screw 
 is tilted on the stage uiultiplied by half the maximum diameter of the thread. 
 
 Extremely large objects, such as milling cutters, hobs up to 2^" diameter, etc., can be accommo- 
 dated on the instrument by means of special arms attachable to the stage which holds adjustable male and 
 female centres. 
 
 3121G. Microscope, as above described, with 1| inch objective, cross-webbed ocular 
 
 and complete set of chucks for carrying micrometer screws, small taps. Duty Frpe Duly Paid 
 
 etc., in strong wooden case 300.00 380.00 
 
 31220. Attachable arms, for carrying large objects 18.90 23.95 
 
 31224. Extra Objectives 2 inch, 1 inch or -f inch focus 6.30 8.00 
 
Model A Model C 
 
 MICROSCOPE, MEASURING, ZEISS, MODELS A, B AND C, witli liorizuntal movement of the microscope tube 
 of either 20 or 50 mm and reading by moans of Mijfronii>|.(jr head to ,,', „ mm. Model A is intended for use 
 
 with objects which may be placed upon ili -i i ;i;raduations, small castings, etc., and especially 
 
 for the measurement of the concavities in i i i ,.1 . ■:■ I n;ed by the Brinell Ball Test. In large pieces or 
 castings the microscope body is removi'^l Icnn] im' n^sr and clamped in a regular laboratory support 
 as in Fig. 2. Model B differs from Model A only in the base and -i.ij.^ . r/n.;. n nu which consists in 
 a heavier base with revolving circular stage permitting two lui m-. i i ■ i : ... i crer, for instance, 
 at 90° each from the other. Model C consists in a base., as in ;i i ■ i — ■■ . nr , with stage and 
 
 mirror for the examination of photographic plates, spectrograph.-,, m '<:.L(jr uby.- ■i.i ii\ means of trans- 
 mitted light. With model C higher power objectives may be used such as Aj (l^li diameters) and AA 
 (54 diameters). The stage plate shown in illustration of ilodel A is removable so that the whole micro- 
 scope with base may be conveniently placed upon large castings in the measurement of Brinell test 
 depressions, etc. 
 3122S. Model A, with horizontal motion of 20 mm, without objectives or oculars, in nuiy Free Duly Paid 
 
 case 50.00 62.00 
 
 312.32. Model A, with horizontal motion of 50 mm without objectives or oculars, in 
 
 case 56.25 69.75 
 
 31236. Model B, with horizontal motion of 20 mm, with heavy base and removable 
 
 revolving circular stage, without objectives or oculars, in case 65.00 80.60 
 
 31240. Model B, as above but with horizontal motion of 50 mm 71.25 88.35 
 
 31244. Model C, with horizontal motion of 20 mm. with stage and mirror for trans- 
 mitted light, without objectives or oculars, in case 68.75 85.25 
 
 31248. Model C, as above but with horizontal motion of 50 mm 75.00 93.00 
 
 31252. Ocular 2, with crosshairs and adjustable eyelens 4.25 5.27 
 
 31256. Achromatic Objective A2, giving a power with above ocular of 15 diameters. , 3.00 3.72 
 
 31260. " " A3, 26 diameters 3.00 3.72 
 
 31264. " " AA, 54 " 7..50 9.30 
 
 Note — Outfits may be made up with any of the above stands and optical 
 equipment of oculars and objectives, but we offer the following as a 
 typical outfit for Brinell test measurements, etc. 
 
 31268. Microscope, Measuring, Model A, with ocular 2 and objective As, in case 57.25 70.99 
 
 For more detailed information send for a copy of Zeiss, Mess 162. 
 
Ca the tome ter, for either horizontal or vertical use, consisting of a brass bar, hexagonal section, mounted 
 between two hardened steel centers and which can be clamped in any position in azimuth. The 
 scale is divided in millimeters and the carriage is provided with spring and clamp. The position 
 of the telescope is read by means of verniers to T/mth millimeter. The telescope has a focal 
 length of about 7 inches and a clear aperture of ^ and is provided with level and cross-wires 
 and may be focused from intinitv to within three feet. 
 
 Length of bar 50 cm 1 meter 
 
 Duty Free 51.00 73.00 
 
 Dity Paid 64.60 91.20 
 
 31276. Cathetomefer, or Reading Telescope, with objective with a focal length of 6 inches and aperture of 
 i inch, can be focussed from 3 ft. to infinity. Telescope is provided with crosshairs and level 
 and fine adjustment screw for accurate setting in horizontal position. With vertical movement 
 by rack and pinion to a distance of 24 inches. Very convenient in the laboratorv for reading 
 thermometers, barometer tubes, burettes, etc. 
 
 Duty Free 33.00 Duty Paid 44.00 
 
 Extra with scale on vertical rod to be read by vernier to 0,02 mm. 
 
 Duty Free 9.0 Duty Paid 12.00 
 
 312S0. Reading Telescope, with hhjr.liv ■_'] ,un, In <li,f.,ri> ,- :iud crosshairs in ocular, with horizontal and 
 verti.'jd rotation aij.l .■! i.i, ! ■,.,, - port.. 17.50 
 
 312M. Reading Microscope, witli i: ,, .- '■ ■ .., ■ , , , , , ,,,,1, scale divided into A mm. This is a most 
 useful rnii.Tny(/o|">p fnr ( i-i ■! 1 n l, 1 int m .mj.- 1.; : , i|, ricoscopes, etc; in general laboratory work. It 
 IS furnished with objei;ti\'es of two fucii and prices do not include any support. The magnify- 
 ing power of the 4 cm focus is 20 diameters and of the 10 cm focus 12 diameters. 
 
 Focussing at approximatelj', cm 4 10 
 
 Duly Free 8.25 §.25 
 
 Stock 12.10 12 10 
 
 31288. Reading Microscope, as above, but with V-shaped support and levelling screws. 
 
 Focussing at approximately cm 4 
 
 S"''' £'" TO-05 
 
 Duty Paid 14,75 
 
 31292. Tele-Microscope, e.xactly similar in appearance to tiie al,ovi. Kc^i.lin,^ Microscope but with special 
 lenses to fiive high magnification and wide field an-l 1, ill. ■, .h ,■, -tube enabling it to be used at 
 
 various distances. .\ very useful laboratory micros, ,, I nnlicularly recommended tor use 
 
 in reading electroscope leaves m the measurement ,.l nini,,- ,< 1 mtv and as used for this purpose 
 by Thomson, Rutherford, etc. The eyepiece scale is lu mm long divided in ,>„ mm and with the 
 draw-tube closed the instrument focusses at approximately 15 cm distance with a magnification 
 of 20 diameters and with draw-tube open focusses at 10 cm with a magnification of 50 diameters 
 without support. 
 
 Duty Free 12.00 Stock . 17 60 
 
 .312116. Tripod Support, convenient for use with either of above Reading Microscopes, with V-shaped rest 
 two adjusting screws and spring clamp (not shown in illustration) to hold microscope tube in 
 position 
 Duty Free 7.50 Duty Paid 11.00 
 
 10 
 10.05 
 14.75 
 
 296 
 
31284. Meat Chopper, useful for the preparation of meat for culture media. Leaves no meat in the machine 
 and is easily cleaned. 
 
 Number 12 4 6 8 
 
 Capacity^ lbs j ^_ 2 __3 4 
 
 Each 1.25 1^ 2.00 "sToo" ~"4.50 
 
 31288. Meat Cutter for Bagasse, etc., for cutting in preparation for laboratory analyses. With automatic 
 feed giving shavings from |th inch thick down to the thickness of thin paper. 8.00 
 
 31292. Melting Point Tube, Thiel, of hard glass 1.00 
 
 31296. Mercury Trough, of porcelain, cross form, holding 3 kilos of mercury 75 
 
 31300. " " of porcelain. 
 
 Capacity, kilos _ 4 8 
 
 Each 1.00 2.00 
 
 31304, Mercury Still, Hulett, as used in the U. S. Bureau of Mines Experiment Station, Pittsburgh, Pa. See 
 Bvlleiin No. ^2 of the U. S. Bureav of Minr» and Pinj^unl Rcnnr. Vol. 34. 1911, p. 30:. consisting 
 of flask of 500 cc capacity, with long neck and side tube, as illustrated, which is sealed to the 
 outlet tube of a Dreehsel wash bottle. The asbestos air bath, asbestos disc "S' tripod and burner, 
 are not included in the price 3.00 
 
 31308. Mercury Still, Hulett, for electric heating. Glass parts only, without electric heater "B." See BuUr- 
 tmNu. iSoflhe U. S. Bureau of Mines 5.60 
 
METALLOGRAPHIC 
 APPARATUS 
 
 No. 3131fi No. 31320 
 
 MICROSCOPE, METALLURGICAL, SAUVEUR-BAUSCH AND LOMB, latest model Handle Arm Type with lever 
 fine adjustment, with rack and pinion for the raising and lowering of the stage so that focusing may 
 be done without moving the vertical illuminator out of the optical axis of the illuminating system and 
 also providing a much greater working distance for thick specimens. With circular revolving stage 
 with large size opening (If inches) in the center, for convenience in manipulating the Sauveur magnetic 
 specimen holder. This is the most widely used microscope in metallurgical laboratories in the U. S. 
 and the outfit as regularly supplied consists of Sauveur Metallurgical Stand; two oculars, lOX and 
 5X; three special metallographic objectives, i.e. short mounted and corrected for use without cover 
 glass, of 32, 16 and 4 mm e.f. ; vertical illuminator; two stage specimen holders, one magnetic and the 
 other non-magnetic, and auxiliary tube, in polished case. 
 
 31312. Microscope a abo e w ut ^ e r Mechanical Stage 128.00 
 
 31316. Microscope as abo e w tl S Mechanical Stage as shown in illustration 150.00 
 
 MICRO-PHOTOOR4PHir APP\R\TUS FOR METALLOGRAPHY, SAUVEUR-BAUSCH & LOMB. This 
 , outfit oft f p t -micrographic outfit with microscope which may be removed for 
 
 regular n 1 instantly replaced in proper position on the outfit or mounted with the 
 
 illun na t rt with aJl adjustments. 
 
 'lup nea finiahed and very stable; has four supports with 25-incli lateral spread, provided 
 
 g screws; carries plate, 21 x 75 In., at height of 22 in. from floor, to which plate are 
 
 f p e type, carefully planed, one accommodating supports for the mioroaeope, arc lamp 
 
 for macroscopic photography (of rail sections, etc.), and parts for lantern slide and 
 
 on when these are desired. The other, graduated to 640 mm, carries camera and 
 
 3 ong hinge joint, permitting the camera to be used in any positioQ from vertical to 
 
 II n c lamp for use witli direct or alternating current, enclosed in a small cj'lindrical hood with 
 
 ach i o rear of condensing mount; carbon adjustments so arranged as to be conven- 
 
 on e he at the microscope or at the camera. Carbons may be adjusted 
 
 Condens ng w h naes ii in, diam. in patent ventilated mount, which Is in turn 
 
 9 and 5 in. diam., in which the condensers may be easily adjusted 
 
 o a d al extension slips o\er the eni of the h"ni and helps to render 
 
 e S lipisprovidedforholding flit r t„ ^ "t en monochromatic 
 
 n found to be almost lo li'- ; hoto micrographic 
 
 ok 'a special fork and stx I i ight and also to 
 
 and nveoiently located adj 1 t tt ng Its direction 
 
 e ted at an angle for transi ir ; illumination. 
 
 Camera I plates and smaller having i i\ i r i,llows draw of 24 in., 
 
 e u g kits for 4 s SJln. and 31 t 4} in. pUtes and a ground glass screen 
 
 V, h g on wo supports clamped to optical bed front standard fitted with alid- 
 
 g o ope A similar camera to take 4x5 and 31 x 41 in. plates can be sup- 
 
 r! e trongly recommend the regular 5x7 camera, however. 
 
 Shu 1 r e ma n um opening of 40 mm. may be set with Instantaneous, bulb or time 
 
 31320. Micro photograph c Outfit i above described, including Sauveur-Bausch & Lomb Metallographic 
 M s N 1 ir w th Mechanical Stage and 5 ampere rheostat for 110 volt circuit. . 310.00 
 
 31324. Micro photographi Outfit as al ove for 220 volts 311.50 
 
 31328, " without Mechanical Stage 288.00 
 
 31.332, " " " " " " Microscope 160.00 
 
 Note — If a 4 X 5 camera is desired $10.00 may be deducted from each of the above prices. 
 31336. Set of Lantern Slide Accessories consisting of supports, bellows, elide carrier, mounted condenser 
 
 and If inch diameter projection lens of either 6, S or 10 inch focus, as desired 17.50 
 
 31340. Extra Carbons for lamp. Please state whether current is alternating or direct. Per 100 2.50 
 
 31344. Focussing Glass 4.00 
 
 29S 
 
MICRO -PHOTO GRAPHIC OUTFIT FOR METALLOGRAPHY WITH INVERTED SAUVEUR-BAUSCH & 
 LOME METALLOSCOPE, The microscope included with this outfit is of the inverted or Le Chatelier 
 type, with fine adjustment controlled from the rear of the camera by a small milled head pulley. The 
 iltuminant is set at a convenient angle to the bed of the camera and arc may be conveniently set 
 without movement from the position necessary at time of focusing. A separate microscope tube is 
 provided for visual examination and with the vertical illuminator permanently fixed the only adjust- 
 men n c I mp 
 
 bupp ne d fid and h atP dp d d 
 
 d warpW ghO flwpe 
 
 OpaBd hpe uypd mm da g upp h p h 
 
 Cond ns ng S em 1 
 
 o a d V h 
 
 31352. 
 31356. 
 31360. 
 31364. 
 
 gk 5 a d i n e a 
 
 I I I l< muuntiDK on two Supports clamped to optical bed; tront standard fitted 
 
 ui li liijj, li~ It »,iit 111 L J iu ih^r t nith nietalloacope. A similar camera to take 4x5 and 31 x 4i in. platea 
 
 can Ll upplitl it a ri- luLtMn At S'O 00 in the price. We recommend the regular 5x7 camera, however. 
 
 .'^hulle^^\ntolnatlc nith steel leases having a ma\imum opening of 40 mm may be set with instantaneous, bulS or time 
 
 Micro -photographic Outfit, as described above, including three special metallographic objectives, 16 
 mm and 4 mm in long mounts and 32 mm in short mount, all corrected for use without covers; 
 four oculars, two each of 6.4X and lOX ; vertical illuminator, two Sauvcur specimen holders, one 
 magnetic and one non-magnetic; inverted Metalloscope stand; camera with automatic shutter 
 and pulley for controlling fine adjustment of microscope as above described, with 5 ampere rheo- 
 stat for 110 volts and with Sauveur Mechanical Stage 345.00 
 
 Micro-photographic Outfit, as above, with rheostat for 220 volts 346.50 
 
 " " " " " without Mechanical Stage 323.00 
 
 Focussing Glass 4.00 
 
 Extra Carbons for lamp. Please state whether current is direct or alternating. Per 100 4.00 
 
 Note — If 4x5 camera is preferred, $10.00 may be deducted from each of the above prices. 
 
METALLOGRAPHIC MICROSCOPE AND CAMERA, TASSIN-BAUSCH & LOMB, a portable outfit for the 
 microscopical iQvestigation of structural metals and other surfaces; particularly designed for the 
 practical study of the forging, casting or bar as it is turned out rather than from specimens cut from 
 the piece which must be taken to the laboratory for examination. The Tassin Apparatus consists 
 essentially of three parts the Microscope, the Illuminating \pparatus and the Camera 
 
 It has 3 large stific « li"ielmg 
 
 Microscope — The n ii,ro3C0pe is of I 
 screws and torma the ba9< 
 ita lenter to the base of t 
 
 aoh iL Lomb tiandk arm t\p 
 the icatniment The staee 
 arm The effect le le iKth d 
 
 the le\ehi g 
 
 1 of the bu I 
 lec permitt 
 
 ir la m j\f 1 jf) a J (ijwn. b\ a rack 
 
 a I ^ means ct j fine A-lju-tment of 
 
 ) the bod\ tube aci that the tube 
 
 I r tl J I minttmg all risk at 
 
 ^hlCh Id furn is 
 itixig apparatus 
 clamped 
 
 li a 
 
 ilium 
 
 \ r tJ Ik 
 reguhr llu- or U lolt 1 
 la fuTDiahed witbr ut Umr 
 direct <r alternatu g thr I 
 cult la to he u'ed the lam i 
 
 When aeet\lene la to b ii I ik 
 "1 h" gii ma^ be =uppl ed b\ a charged ao 
 
 Within tbf vertical illuminator li i 
 n h rea h hi 
 
 amall Acetylene burner both of which are 
 shown ID illustntion the Mazda Kmp being mounted 
 r oulated lugs 
 
 li permit one tf> take current from either the 
 e bank is pro^^dcd with si Ixmp socket^ hut 
 tularh lucphed with a 110 lolt circuit either 
 I and lb c p carbon lamps if a 220 volt cir 
 Wmps 
 I t th bark of the shield by tCPi a of a rod and clamp 
 u,-<e 1 o 1 automobiles nr b\ the generator Hated 
 Lc tor ol clear E,las3. Openings in the mounting permit the 
 ec pon the objeut. Adjustments are provided for 
 
 ha n eu eatablislied, no further attention need be 
 
 h ho ubeln focusing. 
 
 d w 1 a focusing ground glass, two double plate 
 
 Tb board ia fitted witb a draw tube which is 
 
 be e u ar draw tube when making a negative. Two 
 
 6 and 8 mm, when used with a 7.5X ocular, will give 
 
 b wbat sort of neptives he haa obtained and there 
 a a tank for daylight dovdopincc to meet this con- 
 n dard developer and fixing solution. 
 
31368. Tas.sin Metallographic EQuipment complete, as above, consisting of the following |>:irta: special micro- 
 scope stiiud;quick changing nosepiece with three rings; two eyepieces, 7.5X ; three objectives, 32, 
 16 and S mm; vertical illuminator; Tassin illuminating apparatus complete for acetylene; electric 
 light attachment with Mazda lamp; resistance bank with cord, fuse block and connecting plug; 
 Never Out Acetylene Generator No, 3 with six feet of rubber tubing; camera; 2doz. Seed plates; 
 hand magniher; package of developing powders; focusing cloth; changing bag; carrying case 
 
 with fittings 122.00 
 
 31372. Special Microscope with stage 119x92 mm, with four leveling screws, rack and pinion and 
 
 lever fine adjustments 2fi.75 
 
 31376. Quickchanging Nosepiece with three rings 7,00 
 
 31380. Eyepiece 7.5X 1.50 
 
 31384. Objective 32 mm 4.00 
 
 31388. Objective 16 mm 5.00 
 
 31392. Objective S mm 8.00 
 
 31396. Vertical Illuminator 6.50 
 
 31400, Tassin Illuminating Apparatus for acetylene 15.00 
 
 31404. Tassin Illuminating Apparatus for electricity including illuminator, hood, 6-volt Mazda lamp 
 
 and socket 17.50 
 
 31408. Electric Light Attachment consisting of hood, lamp and socket 3.50 
 
 31412. Resistance Bank with snap switch and sockets for six lamps, fuse block, cord and plug; nec- 
 essary for use with electricity; furnished without tamps 7.50 
 
 31416. Never Out Acetylene Generator No. 3 9.00 
 
 31420. Camera with ground glass, two plate holders, shutter and draw tube. 13.50 
 
 31424. Changing bag 1.25 
 
 31432. Developing tank 4.00 
 
 31434. Carrying Case 8.00 
 
 METALLOGRAPHIC MICROSCOPE, REICHERT. The advantage of this instrument is the manner in which 
 the light is brought to bear upon the preparation and the more perfect quality of the illumination 
 obtained thereby. The specimen requires one prepared surface only, which does away with the 
 necessity of providing it with two approximately parallel planes, the instrument being so arranged 
 that the polished surface rests upon a stage set accurately at right angles to the optic axis. The appa- 
 ratus is fitted with convenient appliances for taking rapidly a series of photographs; a new and con- 
 venient form of slow adjustment with slide motion and micrometer screw at the side, the whole acting 
 on the principle of the screw and incdined plane and thereby furnishing an exceedingly sensitive and 
 exact adjustment. 
 
 ■■^^ 
 
 Q i-r^:r^^^^:^^ 
 
 rV^ 
 
 Fig. 4 shows diagrammatically the path of the rays. The rays emitted by the source of light are 
 brought to bear upon the object by means of a prism and the objective, the function of the latter be- 
 ing both that of a magnifying lens and that of a condenser. The light reflected at the object passed in- 
 to the prism Pj, by which means it is deflected into the horizontal tube I and so reaches the observer's eye. 
 To pass from observation with the eye to photographic records the prism marked P^, in Fig. 4 can be 
 given a quarter turn about an axis at right angles to the plane of the stage. The photographic plate, 
 as shown in Fig. 7, is placed at right angles to the optical bench which carries the illuminating appli- 
 ances. To facilitate the observation of the image the instrument may have appended to it an eyepiece 
 elbow fitting which is inserted into the sleeve of the horizontal tube of the microscope. The rays are 
 deflected upwards by a prism and thence pass through the eyepiece to the eye. The advantage of this 
 arrangement is that 'it enables the worker to assume bis accustomed posture. Fig. 5 shows the arrange- 
 ment of the illuminating appliances and their order of sequence. A suitable illumination is furnished 
 bv anv of the usual sources, such as Welsbaeh burners, Nernst lamps, Liliput arc lamps, and arc 
 lamps taking large currents, whilst in photomicrographic work pref- 
 erence should be given to one of the three last named sources. The 
 whole of the illuminating appliances, the wheel diaphragm I (Fig. 5) 
 and the condensing lens B are accommodated in a tube fitting which 
 attaches to the microscope stand. In i '■■•'> same tube there is a slit for 
 the glass screens and the light filter trough furnished with the micro- 
 scope. 
 
 Externally the complete Metallograph presents the form shown in 
 Fig. 6. It will be seen that a heavy sole-plate is surmounted by a 
 pillar, which, like other Reichert microscope stands, is provided with 
 a loop serving as a convenient handle for lifting the microscope. This 
 pillar carries the rack and pinion mechanism for the coarse motion of 
 the stage, as well as a mirror capable of being moved in all directions. 
 
 .-^^ 
 
 "^ 
 
ARTHUR H . 
 
 THOMAS COMPANY 
 
 Fig. 6. No. 3143b. Microscope nith CircuUr Meehanicjl .Slages 
 
 METALLOGRAPHIC MICROSCOPE, REICHERT, (cont ) 
 
 Tlip stage of the inicioscopc; is of the revolving and centering type, two screws being fitted to the side 
 of the stage frame by meana of which the specimen may be displaced by a few millimeters in any direc- 
 tion. Larger displacements may either be made by hand or with the aid of the compound mechanical 
 stage. Fig. 7 represents this microscope as set up in combination with a photographic apparatus. The 
 latter rests with its heavy metal feet upon an optical bench set at right angles to the centre line of the 
 illuminating appliances. The tube facing the camera is optically connected with the latter by means 
 of a sleeve and socket arrangement. The picture on the camera screen can be readily focused with 
 great nicety by means of the movable eye lens of the projection eyepiece without in any way inter- 
 fering with the adjustment of the eyepiece in the drawtube. To make the transition from ocular 
 observation to photomicrography all that is necessary is to turn the small lever under the prism mount 
 horizontally up to its stop. An image which has been sharply focused with respect to the ordinary 
 eyepiece will then appear sharply upon the camera screen. Nevertheless, especially when light filters 
 are being used, it is advisable to complete the fine adjustment by focusing on the screen. In this case 
 the slow motion is transmitted to the microscope by means of a Hooke's key fitted with a socket by 
 which it may be attached to the micrometer head facing the camera. 
 
 The Camera of the metallographic apparatus may be fitted with a focusing mirror, which adds mate- 
 rially to the ease and rapidity with which the apparatus can be used. It enables the observer, after 
 completing the adjustment of the microscope, to obtain a sharp focus on the ground glass focusing 
 screen without having to leave his seat. The ground glass focusing screen M is in this case at the side 
 and parallel to the track of the camera, whilst the dark slide K remains in its usual position. It will 
 be seen that the vertical mirror Sp, as shown in Fig. 8 is hinged between the ground glass focusing 
 screen M and the dark slide K and may be turned about its axis by means of the lever fitted to the out- 
 side of the case. To view the image on the screen the mirror should be placed at an angle of 46° to 
 the axis of the camera (Fig. 8) and during exposure it should be turned back in the direction of the 
 arrow so as to lie close to the ground glass screen. This arrangement is particularly convenient in 
 all cases where the use of feeble sources of light coupled with high magnifications necessitate long 
 exposures. In such cases the arrangement may be readily controlled during the exposure. 
 314.56. Metallographic Microscope, Reichert, as shown in Fig. 6, with rack and pinion coarse adjustment, microm- 
 eter screw fine adjustment with milled heads at the side reading displacements of 0.001 mm, 
 with centring revolving stage, also with wheel diaphragm, condensing lens, two glass screens, 
 and one light-filter trough in a tube fitting. Without objectives or Duly Frue Duty Paid 
 
 eyepieces 126.00 168.00 
 
 31440. Objective, No. 2 .5.10 6.80 
 
 31444. Apochromatic Objective, 16 mm 18.00 24.00 
 
 31448. " " S! mm 25.50 34.00 
 
 31452. " " 4 mm 31.50 42.00 
 
 31456. " " 3 mm 34.50 46.00 
 
 31460. Apochromatic Immersion Lens 2 mm 75.00 100.00 
 
 31464. Compensating Eyepiece, No. 4 4.80 6 40 
 
 31465. " " " 6 4.80 6.40 
 
 31472. '■ " " 8 4.80 6.40 
 
 31476. Micrometer Eyepiece " III 3.60 4.80 
 
ARTHUR H. THOMAS COMPANY 
 
 31488. 
 31492, 
 31496, 
 
 31500. 
 
 31504 
 
 31508. 
 31512. 
 31516. 
 31520. 
 31524. 
 
 31528. 
 31532. 
 31536. 
 
 31540. 
 31544. 
 31548. 
 
 Attachable and Recording Mechanical Stage giving two motions at right angles to one another, the 
 ranges of the respective motions being 30 mm. The magnitudes of the motions can be read 
 with the aid of scales and verniers, and hence the position of any given element may be record- 
 ed and found without searching. 
 Duty Free 25.50 Duty Paid 34.00 
 
 Large Circular Mechanical Stage for attachment in the place of the centring and revolving stage usually 
 employed. It has a diameter of 120 mm, it may be rotated and gives two motions at right angles 
 to one another through a range of 20 mm. The magnitude of the motions can be read to 0,01 
 mm with the aid of verniers and divided drums. The stage is interchangeable with respect to 
 the fixed stage, which is better adapted for the examination of large pieces of metal. Additional 
 price of both stages. 
 Duty Free 30.00 Duty Paid 40.00 
 
 Eyepiece Elbow Mount with prism for observation from above, to slip into the Duty Free Duij Paid 
 drawtube of the microscope (Fig. 5) 6.30 8.40 
 
 Stage Micrometer ruled upon metal, being one millimeter divided into 100 
 
 parts 2.55 3.40 
 
 Ground Glass Screen with etched scale of millimeters for use in conjunction 
 with a stage micrometer for ascertaining the magnification furnished 
 by a photograph 3.75 5.00 
 
 Ground Glass Screen for ocular observation, to secure greater uniformity in 
 
 the illumination when arc lamps are used, on stand. 3.75 5.00 
 
 Photographic Equipment for use with Beichert Metallographic Microscope. 
 
 Large Base Plate with two Optical Benches, Microscope Base, and Photomicrographic Camera, the latter 
 being provided with a ground glass and plain plate glass focusing screen and a dark-slide to take 
 
 13 X IS cm (7* X 5 in.) plates and carriers to take 9 x 12 cm (4^ x 3} Dufy Free 
 1.) plates. The bellows give an extension of 75 cm (30 inches) ...... 50.10 
 
 " '■ 3.00 
 
 Hooka's Key for focusing from a distance 
 
 Projection Evepiece No. 2 
 
 No. 4 
 
 One Extra Double Dark-slide 
 
 One Focusing Lens 
 
 New Nernst Lamp on stand to raise and lower 
 
 a) for a supply pressure of 80 -200 Volts 
 
 b) " " " " " 200-300 " 
 
 Small Hand Regulating Arc Lamp with carbons placed at right angles to one 
 
 another, taking 4 amperes 12.75 
 
 Ditto with Ilooke's Key for operating from a distance 18,75 
 
 Resistances for lamp No. 31536 for 110 volts 4.50 
 
 Large Hand Arc Lamp with carbons placed at right angles to one another, in 
 
 metal casinc;, wound for a current of 10-30 amperes ■ ■ •. 
 
 Universal Motion Fitting for adjusting lamp No. .'',1548 in every direction, with 
 
 two Hookp'p knys 
 
 12.00 
 6.30 
 4.20 
 
 9.75 
 9.75 
 
 56.2: 
 
 16.80 
 
 Duly Paid 
 66.80 
 4.00 
 16.00 
 16.00 
 8.40 
 5.60 
 
 13.00 
 13.00 
 
 25.00 
 6.00 
 
ARTHUR 
 
 THOMAS COMPANY 
 
 MICROSCOPES AND ACCESSORIES 
 
 The BH Mifro^nprs ; 
 probably more widely us 
 IhroiLghoul the U. S. for s 
 di^nts' laboratory work lli 
 
 lype I 
 
 Mir 
 
 
 with regular qnick acting acrew substage 
 
 MICROSCOPE, BAUSCH & LOME TYPE BH. This iiiicroscupe is probably more widely used for students' 
 laboratory work in the U. y. than any other make or type of instrument. It was the first Handle Arm 
 Microscope with the modern adaptation of the lever fine adjustment and was such a pronounced suc- 
 cess that the modification of the other instruments, BBH, CAH and DDH, rapidly followed. With the 
 iiddition of a substage of thp ciuick acting screw type, Abbe condenser, and iris diaphragm, the BH 
 type is available for !>;mIi] luln^ieal and other work requiring the use of the oil immersion objective of 
 1.9 mm focus. Tin- i- I.-:.-, , .-I as the BH8. 
 
 
 
 Focusing Adjustment — Coarse adjustment by standard rack and pinion; fine adjustment of the Bausoh & Lomb lever type with 
 
 tivo-sized knurled head for slow and rapid movement, ceasing to operate when objective touches the slide. 
 & g BH — m d leasuring 103x101 mm. with a distance of 59 mm from 
 
 to 8 phragm so mounted as to be readily detached if desired and 
 
 g er; iris diaphragcn controlled by knurled ring, operated 
 
 
 BH - 
 
 a mounting for the Abbe condenser and an iris dia- 
 urned up as far as possible, allowing the condenser to be 
 eft of the optical axis when screw reaches the limit of 
 osing when condenser is in position, 
 heads in yellow. 
 
 31600. 
 31604. 
 31ti08. 
 .31612. 
 31616. 
 
 <) III fit 
 
 D 
 
 y ( 
 
 BHl 
 
 10 nun 
 
 4 mm 
 
 liH2 
 
 16 mm 
 
 4 mm 
 
 bh;} 
 
 16 mill 
 
 4 mm 
 
 BH4 
 
 16 n-ini 
 
 4 mm 
 
 BH8 
 
 16 mm 
 
 4 mm 
 
 1.9 mm 
 
 L Eyepieces 
 
 "o X 
 
 7.-5 X 
 
 5 X 10 X 
 
 5 X 10 X 
 
 5X 10 X 
 
 Circular Double 
 
 Circular Double 
 Circular Triple 
 
 1.20 N. A. 
 
 Price 
 27.50 
 31.50 
 29.00 
 33.00 
 70.00 
 
 Note — Microscopes BHl, BH2, BH3 and BH4 are furnished with a substage ring .and Abbe condenser 
 1.20 N. A., in an iris diapliragm mounting at an additional cost of S7.50. The Abbe Condenser 
 in the BHS outfit is supplied in the regular quick acting Screw Substage. The above are the 
 outfits regularly supplied. Prices on special outfits quoted on application. 
 
The BBHK Microscope is the 
 idurd thraui!hou( the U. S. 
 
 :dical and olher advanced 
 
 No. 3H;wi— CAHN 
 Viilh complete sub stage 
 
 MICROSCOPE BAUSf H AND LOME TYPES BBH AND CAH. The BBH Microscope is the handle arm suc- 
 
 1 e 1 1 1 s for many years the standard microscope throughout the United 
 
 e n 1 fur 1 b -atory work in all advanced work. The CAH Microscope differs 
 
 ze ind ha ng the complete substage and is recommended for the individual 
 
 n ore al need work. Unless otherwise stated the following specifications 
 
 f tie BUM 
 t te fo ph 
 f n tie BBH 1 
 p t pnt St d 
 i pi t 1 oth t I 
 Body Tube-0 
 
 i 1 with society screw thread; atandard size eyepieces are used; draw-tube graduated 
 ine numbered, adjustable in olotli-line<l slec^ve, or in metal fitting, if ao apecified, 
 a for the use of low power objectives. 
 
 andard rack and pinion; fine adjustment of Bausch & Lomb lever type with double 
 
 ow and rapid movement, the larger part, graduated into 100 divisiona, each equal 
 
 t and provided with a hinged indicator, which may be turned back from the head; 
 
 nhen objective touches the slide. 
 
 duized rubber; measures 120 x 107 mm, with a distance of 70 mm from ita center to base 
 
 th a distance of 7.i mm from its center to base of arm. 
 t ct:ng acrew; consiata of a mounting for the Abbe coudeaaer and an iria dia- 
 t ige when the screw ia turned up as tar aa possible, allowing the condenser to 
 tUB, i£ desired; aubstage is swung to the left of the optical axis when screw 
 
 r of Bausch & Lomb n 
 
 1 mjun ; upper iris diaphra 
 
 substaee; Abbe condei 
 
 lafhragm for use: lower ir 
 
 w construction, and arranged to take all the substage 
 m of domeahape, self-locking, combined with Abbe 
 ler removable from optical axis by a double swing 
 < diauhragm adjustable laterally by rack and pinion 
 
 31620. 
 31624. 
 31628. 
 31632. 
 31636. 
 31640. 
 
 31644. 
 31648. 
 31652. 
 31656. 
 31660. 
 
 d ng od u n ol ol proof black, adj 
 with polished hniah; fitted mth braaa loclc a 
 Objeefiyes 
 
 BBHl 
 BBH2 
 BBH3 
 B6H4 
 
 BBH6 
 BBH8 
 
 CAHl 
 CAH2 
 CAH.5 
 CAH4 
 CARS 
 
 -The new sv ^ 
 
 one in Ihc liBHb and BBH8 o 
 
 Hi mm 
 16 mm 
 16 mm 
 16 mm 
 16 mm 
 16 mm 
 
 16 mm 
 l(i mm 
 16 mm 
 16 mm 
 16 mm 
 
 4 mm 
 4 m. 
 4 nr 
 4 mm 
 4 m: 
 4 mm 
 
 4 mn: 
 4 mi 
 4 mill 
 4 mm 
 4mi] 
 for th< 
 tills i 
 
 Oil Immersion Eyepieces 
 
 "7..5X "~ 
 
 7.5 X 
 
 5 X 10 X 
 
 5X 10 X 
 
 5 X 10 X 
 
 1.9 mm 5 X 10 X 
 
 7.5 X 
 
 7,5 X 
 
 5 X 10 X 
 
 5 X 10 X 
 
 10 X 
 
 kbbe Condetiser witli upper and ii 
 
 of SS.l 
 
 Circular Double 
 
 Circular Double 
 Circular Double 
 Circular Triple 
 
 Circular Double 
 
 Circular Double 
 Circular Triple 
 iria diaphragms, i 
 
 Price 
 41.50 
 45.50 
 43.00 
 47.00 
 54.50 
 80.00 
 
 76.00 
 80.00 
 77.50 
 81.50 
 110.00 
 aubslituted for the regular 
 
 1.20 X. .4. 
 1.20 N. A. 
 
 1.20 N. .A.. 
 1.20 N. A. 
 1.20 N. A. 
 1.20 N. A. 
 1.20 N. A. 
 
 When ordering this mounting, please specify " 
 
No, 31680— DDHS wilh Kevolvinf .Mechanical Stage 
 and Complete Substage 
 
 MICROSCOPE, BAUSCH AND LOME TYPE DDH. This is the largest and most elaborate of the Bausch and 
 Lomb Handle Ann series and is imrticularlj' designed for advance research work, photo-micrography, 
 etc. 
 Pillar— Double rectangular in aeotioii, provided with inclination joint and clamping lever to secure the instrument in any position 
 
 and with stops in the vertical and horizontal positionB. 
 Body Tube — Of aluminum, 50 mm outside diameter; provided with society screw thread standard size evepieces are used; draw 
 tube graduated in single millimeters with every tenth Une numbered aijuotahle in cloth lined sleeve, or in metal fit- 
 ting, if so specified, and provided with a society screw thread; loner collar ma\ be removed for attacliing the Micro- 
 Tessar, 72 mm objective. 
 Focusing Adjustment-Coarse adjuotiiient by standard rack and piniou; fine adjustment of Bauach & Lomh lever type with 
 
 h ger graduated Into 100 divisions, each equal to 
 
 to hioh ma\ be turned back from the head. 
 
 and pinion i io\e iients, covering a range of 75 
 d ble for substitution o£ plain stage, if desired, 
 
 b CLeaaonns inserted into the upper sleeve, may 
 
 "i k d p diaphragm ot dome shape, self locking, com- 
 
 be condenser removable from optical axis by a 
 PP n lower iris diaphraKm adjust:ilile laterally by 
 
 d mounted on a swingins arm, allowing it to 
 
 _a vertical n m 
 
 Stage — Revolving mechanical, w h 
 
 mm outside and 112 rat d 
 
 mm and -^5 mm, respect 
 or upper part may be r i 
 
 Substage— Complete with swinp: 
 
 he easilj' employed; ad h 
 
 bined with Abbe conde 
 double swill g_ mo vemen 
 rack and pinion for obi 
 be swung entirely out 
 Finish— Main parts, including 
 Case- 0/ hardwood with polish d fi 
 
 
 n J ellow 
 
 31664. 
 
 31668. 
 31672. 
 31676. 
 31680. 
 
 31681. 
 
 Oulfil 
 
 
 
 DDHI 
 
 16 mm 
 
 4 mm 
 
 DDH2 
 
 16 mm 
 
 4 mm 
 
 DDH3 
 
 16 mm 
 
 4 mm 
 
 DDH4 
 
 16 mm 
 
 4 mm 
 
 DDHS 
 
 16 mm 
 
 4 mm 
 
 7 
 
 5 X 
 
 Nosepieces 
 
 Condcns 
 i,2() .\ 
 
 er 
 
 Price 
 131.00 
 
 7 
 
 o X 
 
 Circular Doublu 
 
 1.2U N 
 
 
 135.00 
 
 b X 
 
 10 X 
 
 
 1.20 X 
 
 
 132.50 
 
 ,S X 
 
 10 X 
 
 circular Double 
 
 1.20 K. 
 
 
 136.50 
 
 b X 
 
 10 X 
 
 Circular Triple 
 
 1.20 K. 
 
 A, 
 
 165.00 
 
 1.9 mil 
 Plain Vulcanite Stage for DDH, intercliangeabic with the Revolving Median ical Stage. 15,00 
 
ARTHUR H. THOMAS COMPANY 
 
 Tho F and FF MicrOHCOpi'. 
 trnbody all (lie advanUgcs o 
 Ihc Lever Fine Adjusi 
 combined wilh the C 
 
 N«, 31G9G-F4 
 iviLh slaiie iris diuphratim 
 
 MICROSCOPE, BAUSCH & LOME CURVED ARM TYPE F & FF. This Microscope is tbe latest development 
 of the handle arm type with lever fine adjustment and is preferred by many to the BH type because 
 of the facility and safety with which the arm of the microscope may be grasped by the whole hand and 
 because of the large amount of space available for manipulation of the object on the stage. 
 
 Jody Tube— Fr 
 rtiillime 
 
 ety screw threud; 9t;uid:ir<l shed eyepieces are used (23 » 
 tenth line numbered, adjustable in cloth lined sleeve or 
 V- thread for the use of low power objectives. 
 
 I fittin 
 
 Focusing Adjustment — Coarse adjustment by standard rack and pinion, provided with stop to prevent pinion from overriding 
 rack; fine adjustment of Eausch & Lomb original lever type with two-sized knurled head for slow and rapid movement, 
 (■eiiin'T to npcriti' wlii'n objective touches the slide; adjustment head locked to prevent removal; all parts of fine ad- 
 
 Finish— M 
 
 Case— Of I 
 
 iizb I rubber except at point o£ attachment; 
 t'jge surface (distance from optical center 
 H o F4 outfits the stage is provided with an ins 
 to hold an Abbe condenser; iris diaphragi 
 ige attached to arm on broad bearing surface 
 
 f I lack, adjustment heads in yellow. 
 
 I rass lock and ki'v. 
 
 103 X 102 mm, with a dia- 
 
 extreme inner curve of arm, 85 
 
 s diaphragm with, mount having 
 
 illed by knurled ring, 
 
 ; maKimum rigidity. 
 
 
 Substage 
 
 d 
 
 ' 
 
 
 
 
 luick-actmg scr, 
 the stage when tl 
 e slide; eondeii'.er ] 
 
 ung to the l^ir i j 
 ked against tlo-'iiiE u 1 
 
 ',. , 
 
 
 rami i 
 
 Ihe .., 
 
 
 
 
 
 Objecli 
 
 o 
 
 
 Eyepieces 
 7.5 X 
 
 NnsepieMS 
 
 Abbe 
 Condenser 
 
 
 
 Oulht 
 
 D 
 
 'r„;;7 
 
 Oillm 
 
 mersion 
 
 Price 
 
 31(iS4. 
 
 
 n 
 
 6 mm 
 
 27.50 
 
 31688. 
 
 
 r2 
 
 6 mm 
 
 4 mm 
 
 
 
 7.5 X 
 
 Circular Double 
 
 
 31.50 
 
 31692. 
 
 
 F3 
 
 6 mm 
 
 4 mm 
 
 
 
 5 X 10 X 
 
 
 
 29.00 
 
 31696. 
 
 
 F4 
 
 6 mm 
 
 4 mm 
 
 
 
 5 X 10 X 
 
 Circular Double 
 
 
 33.00 
 
 31698. 
 
 
 FF6 
 
 6 ram 
 
 4 mm 
 
 
 
 5 X 10 X 
 
 Circular Double 
 
 1 20 X. X. 
 
 41.00 
 
 31700. 
 
 
 FFS 
 
 6 mm 
 
 4 mm 
 
 1.9 
 
 mm 
 
 5 X 10 X 
 
 Circular Triple 
 
 1.20 K. A. 
 
 65.00 
 
 Note — Microscopes Fl to F4 can be furnished with a substage ring and Abbe condenser, 1.20 N. A. in 
 an iris diaphragm mounting at an additional cost of $7.50. In the FF6 and FFS outfits the sub- 
 stage furnished is the regular quick-acting screw type. The above are the outhts regularly 
 supplied. Prices on special outfits quoted on application. 
 
Thps|. Microsropes offer 
 the combined advan- 
 lages of (he Lever Fine 
 Adjuslmenl with (he 
 Side Whfcl and Curved 
 
 MICROSCOPE B4USCH&LOMB( UR\Fr» \RMT\Prrs \ND FFS with Lever Side \\ heel Fine Adjust- 
 
 ment ilii^ IS a ncrt miciuoi j] 
 conjuoftion with the cui^pd an 
 their oiigmil le\ er t\pe of fine 
 adopted TIj n I i t ti i 
 est pon L I I I 
 
 adjustm I I I 
 
 motion I I I 
 
 pleteioti I 
 
 fine adju I 
 
 ing turn t 
 
 ind the i Ij i i 
 
 matic til I \ 1 1 
 
 BodfTube 3cre\ 
 
 1 1 
 
 1 t 
 
 t the le\ti tjpe ■^\hith i3 here used in 
 I) tor man J \ears The pimciple is that of 
 t the test of time md ha'i been\er^ generally 
 1 Ii ite n ^ III lit 1 I T\ rk With the high- 
 Ill I wedge, and the 
 I III- wear or lost 
 
 inner eqiiival 
 
 s I ^ ei ti tl 111 II I I ji e\ ery corn- 
 
 lie operated fion citl I 1 I ^ht ji iri le ji 1 1 f- nil a turn of the 
 inff the body tube m the same direction upoido^n is a torrespond- 
 heads Pcitn e stops denote the upper and lower liinitb of motion, 
 
 I ite when the objective comes m contact with the slide \n auto- 
 
 d 
 
 'i are u'^ed C 
 
 31704. 
 31708. 
 31712. 
 31716. 
 31720. 
 31724. 
 
 
 Substageori'l'fM^ an 
 
 .lU[,lir4ir,.l 
 
 Outfit 
 FSI 
 
 FS2 
 
 FS3 
 
 FS4 
 
 FFS6 
 
 FFS8 
 
 
 : ani^ adjuatm 
 r teada prodm 
 
 I I J iilcanized rubber except at point of contact with arm; measures 102 x 102 mm, with a 
 
 i r Lij iriii at Btage surface (distance from optical center to extreme inner curve of arm, 85 mm); 
 
 la tliL Fbl to PS4 Outfits the stage is provided with an iris diaphragm with mount having 
 
 a aubstage nng to taku an Abbe Condenser; the iris diaphragm being controlled by a knurled 
 
 at of ite circumference. With mechanical stage No. 32508 tile entire surface of a slide, 50x75 
 
 I f L L im I I (injj; screw; consists of a mounting for the Abbe condenser and an iris 
 
 I I I I .1 lu'Ei the screw ia turned up as tar as possible, allowing the condenser 
 
 I III I I .li-kioe is swung to the left of the optical axis when screw reaches the 
 
 I I II ii II ally locked againat eloaing when condenser is in position, or against 
 
 tubt in ali^ohol-proof black ; other parts i 
 nish fitted with brass lock and key. 
 Objectives 
 
 Eyepiecc a 
 7.5 X " 
 7.5 X 
 
 5 X 10 X 
 
 5x 10 X 
 
 5x 10 X 
 
 5x 10 X 
 
 Dry Immersion 
 
 16 mm, 4 mm 
 
 16 ram, 4 mm 
 
 16 mm, 4 mm 
 
 16 mm, 4 mm 
 
 16 mm, 4 mm 
 
 16 mm, 4 mm 
 I to FS4 can be furnished 
 ind FFS8 are provided 
 
 Circular Double 
 
 1.9 
 
 with ; 
 
 Circular Double 
 Circular Double 1.20 NA 
 Circular Triple 1.20 NA 
 
 aubstage ting with Abbe Condenser of 1.20 NA at an extr 
 quick acting screw sub stage. 
 
 provided with a 
 
 Price 
 
 30.00 
 34.00 
 31.50 
 35.00 
 43.50 
 67.50 
 ist of S7.S0. 
 
R T H U R 
 
 Thcsr 
 
 Micnisci 
 
 ipos i 
 
 off IT 
 
 the 
 
 rambined adtmi 
 
 lafft 
 
 1 of 
 
 the 
 
 U-ver Fi 
 
 ne Adj. 
 
 ■slmi 
 
 Mlt > 
 
 ,vith 
 
 I he Side 
 
 Wheel 
 
 and 
 
 Curved 
 
 No. 31741 CA 
 
 MICROSCOPES. BAUSCH & LOME CURVED ARM TYPES CAS AND CCS with Lever Side Wheel Fine Ad- 
 justment. These models are of the size and general construction of CAH and CCH and combine with 
 these features the curved arm with lever side wheel fine adjustment as introduced in types FS and FFS. 
 
 Base and PiLlar— Same as in CAH. 
 
 Arm— Long curved form of rectangular cross section with rounded edgea. 
 
 Body Tube— Same aa in CAH. 
 
 Focusing Adjustment — Coarse adjustment by rack and pinion; fine adjustment of new ai 
 
 liead on each side of arm, with drums graduated to read single microns of vertical 
 
 on side of arm to show upper and lower limits of fine adjustment range. 
 Stage of CAS — Of metal covered with vulcanized rubber, 125 x 115 mm with a distance of 87 mm from center to baseol 
 
 spring clips. 
 Stage of CCS — Circular revolving. 125 mm diameter, with vulcanite top, centering screws and spring clips. Distance 
 
 of stage to base of arm 87 mm. Interchangeable with large revolving mechanical stage. 
 Substage — Complete substage equipment xvith Abbe Condenser, as supplied with CAH, DDH, DHS. etc. 
 Finish — Main parts, including body tube, in alcohol proof black. Adjustment heads in yellow lacquer 
 Case— Of hardwood with polished finish. With brass lock and key. 
 
 31728. 
 31732. 
 31736. 
 31740. 
 31744. 
 31748. 
 31752. 
 31756. 
 31760. 
 31764. 
 
 
 
 Objeetires 
 
 Ouini 
 
 Dry 
 
 Oil I 
 
 CASl 
 
 16 mm 
 
 
 imn 
 
 CAS2 
 
 16 mm 
 
 
 mm 
 
 CAS3 
 
 16 mm 
 
 
 mm 
 
 CAS4 
 
 16 mm 
 
 
 mm 
 
 CASS 
 
 16 mm 
 
 
 mm 1 
 
 CCSl 
 
 16 mm 
 
 
 mm 
 
 CCS2 
 
 16 mm 
 
 
 mm 
 
 CCS3 
 
 16 mm 
 
 
 mm 
 
 CCS4 
 
 16 mm 
 
 
 mm 
 
 CCS8 
 
 16 mm 
 
 
 mm 1 
 
 7,5X 
 
 7.5X 
 
 5X lOX 
 
 5X lOX 
 
 5X lOX 
 
 lOX 
 
 lOX 
 
 6X lOX 
 
 5X lOX 
 
 5X lOX 
 
 Noaepieces 
 
 Circular Double 
 
 Circular Double 
 Circular Triple 
 
 Circular Double 
 
 Circular Double 
 Circular Triple 
 
 A. 
 
 Abbe 
 
 1.20 X. 
 1,20 X. 
 1 20 N. A. 
 1 20 N. A. 
 I 20 N. A. 
 
 1 20 X. A. 82.00 
 
 1 20 X. A. 86.00 
 
 1.20 iX. A. 83.50 
 
 1 20 X. A. 87.50 
 
 1.20 X. A. 116.00 
 
 72.00 
 76.00 
 73.50 
 77.50 
 106.00 
 
ubslaHP 
 
 MICROSCOPE, BAUSCH & LOME CURVED ARM TYPE DOS with Lever Side Wheel Fine Adjustment. This 
 Microscope is in size and finish identical with DDIl but is here combined with the curved handle arm 
 and lever side wheel fine adjustment previously introduced in FS and FFS. This Microscope, like the 
 DDH, is provided with large body tube for photo-micrograpln- and large revolving mechanical stage 
 and is particularly designed for advanced work in research. 
 
 Baa -H I 
 
 u ng Ad 
 
 ces are used; draw 
 eeve, or in metal At- 
 taching the Micro- 
 
 o a ub stage support. 
 
 
 Ouirit 
 
 D„ 
 
 Oil 
 
 Immersion 
 
 Eyppicce.s 
 
 N.«,lece, 
 
 Condenser 
 
 Price 
 
 3176S. 
 
 DDSl 
 
 16 mm 4 mm 
 
 
 
 7.5X 
 
 
 1,20 N. A. 
 
 120.00 
 
 31772. 
 
 DDS2 
 
 16 mm 4 mm 
 
 
 
 7.5X 
 
 Circular Double 
 
 1.20 N. \. 
 
 124.00 
 
 31776. 
 
 DDS3 
 
 16 mm 4 mm 
 
 
 
 •5X lOX 
 
 
 1 20N. A. 
 
 121.50 
 
 31780. 
 
 DD.S4 
 
 16 mm 4 mm 
 
 
 
 ■^X lOX 
 
 Circular Double 
 
 1 20 N A. 
 
 125.50 
 
 31784. 
 
 DD,S8 
 
 16 rriTii 4 mm 
 
 
 1.9 mm 
 
 .5X lOX 
 
 Circular Triple 
 
 1 20 N. A. 
 
 154.00 
 
R T H U 
 
 No. 3180-1— BHPN in Cus 
 
 Nn. 31808 
 
 MICROSCOPE, BAUSCH AND LOME PORTABLE TYPE BHP. Tliis microscope is of the same general con- 
 strintif 11 it, the BBH but with folding st i^p m I base to permit of convenient insertion in a small 
 carrying case It has bcfn wideh used for fieli work nutibh b> the Rockefeller Sanitary (.'ommis- 
 sion for the Eradicatioti of the Hookworm to which we ha\e supplied many iastruments. 
 
 Base— \ ■)} a[ed n tl I u I p I il I n th micro'ic re -it full inclination. 
 
 Focusing Adjustment adjuitm nt of Bau3ch & Lomb lever type with doable 
 
 ki rl i n 1 r I irger r'lrt gr'id.uited into 100 divisions, each equal to 
 
 dim jt r nh f imj be turned back from the head; fine 
 
 Stage (If I Uckened ] ■-U 
 
 of .irm provi led w tl i 
 pUn e It in case and \ 
 
 Substage — Adjustable for fofui I 
 
 1 a distiinee of 
 
 the \1 be condenser and an iris diaphragm, 
 ir as possible, allowing the condenser to be 
 to the left of optical axis when screw reaches 
 
 Objectiv. 
 
 Outfit Dry Oil Immersion Eyepieces 
 
 31800. ~ "BHP4 K; mm 4 nim ' 5 X 'l"0 X Circular Dou'ble 
 
 31804. BHPS 16 mm 4 mm 1.9 mm 5 X 10 X Circular Triple 1.20 N. 
 
 MICROSCOPE, BAUSCH AND LOMB DEMONSTRATION TYPE O. This instrument enables an instructor 
 to supplement his lecture work by showing a single object to an entire class. He has only to adjust 
 the slide, focus the instrument and pass it around the class, the students pointing it to the light to 
 make the observations. We have supplied this instrument also to a number of industrial establish- 
 ments, such as manufacturers of safety razor blades for the convenient examination by workman of 
 delicate parts during manufacture. 
 Arm — Handle type, of ample size. 
 Stage — Of blackened metal, 100 x S3 mm, giving a distance of 42 mm from its center to arm, provided with Bpring cUpi 
 
 small posts underneath to hold the instrument in a vertical position when not in use. 
 Focusing Adjuatmenf— Body tube slides in a cloth-lined spring tube; when properly focused, it may be secured by a 
 
 31808. 
 31812. 
 
 .56.50 
 92.50 
 
 md with 
 
 V above the handle. 
 Body Tube— Fixed length. 160 mn 
 
 Outfit 
 
 O 
 
 O, 
 
 ivided with society scr 
 Objectives Dry 
 
 tiv for regular miscoacope objee 
 Eyepieces 
 
 7:5 X 
 
 7.5X 
 

 erUcailj 
 
 MICROSCOPE, BAUSCH & LOME BINOCULAR, with image erecting prisms, paired ocuiars and objectives. 
 The body tube with prisms is similar to that used in the Zeiss Binocular and the eye-pieces are ad- 
 justable for intcr-pupilary distance. The base is readily removable as is the glass part of the stage 
 in which arrangement the instrument may be used for a variety of purposes. The distinct improve- 
 ment in this model is in the construction of the arm which permits the detaching of the curved portion 
 from the sliding piece which carries the rnck and nlso frnm the body tube proper. These features 
 penjiii flic <|uickiri<Tc:isinti"rdcrn-i-inM ,/(!,, v, ,,, \ : ..m ,] i ,| , ,,,.] .,U„||u' Mbiiosl uiiivrrsal applica- 
 tion ofl.hc l,innrul:i r Ix.dv wlini u,-' I II. ■ ...mI I,. I r.^i tiJon^tMiid.-iiMlsiipport, The 
 
 Stand fill' l;irKc piv|,ar.-iliniisfniiM-i- . I 1 .,-. .. 1... ..■■■I,... i. i .,■,>. li li .-i iTiunvuhlc wooden stage. 
 
 31816. Microscope, Binocular, as abm-r, si'iml iujl; -.■.Ml. I.^r.l kvi- Lim \miIiou1 ncuhir^^ nr objectives, in 
 c:isr 45.00 
 
 Support for Largo Preparations, without binocular body tube 18.00 
 
 31820, 
 .■ilS24 
 
 with binocular body tube, without i 
 for binocular body tube 
 
 Paired Objectives, for Bausch & Lomb Binocular J\Iicrosro|i('. 
 
 Equivalent focus, mm .")."i 
 
 Each 11.00 1 
 
 Paired Oculars, for Bausch »t Lomb Binocular Microscope. 
 
 Power 5X 6 
 
 Equivalent focus, mm 50 
 
 Each XOO 
 
 ihjc 
 
 ul;\ 
 
 i but with case 
 53.00 
 
ARTHUR H. THOMAS COMPANY 
 
 No r,\fM No. 31848— Sho wine base opened 
 
 MICROSCOPE, BAUSCH AND LOMB CHEMICAL TYPE M. C^onstructecl after the specifications of Dr. E. M. 
 Chamot of Cornell rniyorsity, and is designed for work in all branches of Micro-Chemistry and in coni- 
 me,rcia! laboratories, being admirably adapted for the examination of foods and drugs as well as chem- 
 icals. Hip:h power objectives may be used with it, but a small cover glass should be cemented with 
 pure glycerine to the f ont fe ei 1 wjo erst pre ent da naging from contact with reagents. Bausch 
 & Lomb quick changi ^ ose; e e reo- larlv 1 ste 1 w th this instrument, as it is desirable under 
 ordinary conditions to 1 e b one ol je ti e on tl e stand at once. The instrument is of the Handle 
 
 p to the BBH except for the revolving stage. 
 
 n single degrees, with, every tenth, line numbered, and 
 J 78 mm inside graduationa, witli a distance of 58 mm 
 spring clips and centering acrews. 
 
 raduated in two-degree divisions with every tenth line 
 g over draw tube and ia slotted to engage stud for zero 
 
 tenth 
 
 C OH S Ha r Eyepieces 
 10 X 15^< 
 
 10 X 15 X 
 
 f 5X 7.5 X\ 
 "I 10 X 15 X / 
 
 
 Arm Type with le er fi e 1 
 
 
 SUge— Circular re vol v ng w 
 
 
 read by acon^enen 
 
 
 from center to aae o 
 
 
 
 
 numbered; col a e 
 
 
 point; can be eas e 
 
 
 
 
 line numbered and la an 
 
 
 bj- stud which e es orreapo 
 
 
 Finiah— Entire instrun ea fins 
 
 
 Case— Of hard wood u h po d fin h h ed w 
 
 
 Outfit Ob ec ves D y 
 
 3183(i. 
 
 Ml 16 mm S mm 
 
 31840. 
 
 M 2 10 mm 8 mm 
 
 With Two Rings 
 With Three Rings 
 
 84.00 
 90.65 
 
 Microscope, Dissecting, Barnes, consisting of a block of wood neatly finished and made in a shape 
 forming hand rests; with hinged base providing a case for accessories. Stage is of glass 80 x 70 
 mm, removable, and with black and white plate supplied for use as opaque background; distance 
 from center of post to center of lens 50 mm. While Doublet lenses are supplied with the regular 
 outfits listed below any of the regular magnifiers such as Coddington, Triple Aplanat and 
 Hastings will fit the lens holder. 
 
 Number of Doublets 1 2_ 
 
 Each _. 2^50 3^ 
 
 Lens Holder, Type TU, consisting of a one piece lens arm with spring clamp taking any magnifier not 
 more than 38 mm in diameter, all mounted on heavj' metal base; distance from center of post 
 to center of lens 205 mm, adjustable in all directions 3.00 
 
 Lens Holder. Tj^pe TUS, consisting of jointed lens arm on triangular post, with rack and pinion, dis- 
 tance from center of pillar to center of lens 340 mm. Spring clamp will take any lens not over 
 38 nun in diameter, range of rack work 48 mm. Sec illustration on following page 9.00 
 
No. 31N5h TUS 
 
 No. liVnr. Tipe YZ 
 
 **^^**. 
 
 No ll'.hU Tvpi I 1 No. :!1SSS Type Wl 
 
 MICROS* OPES, B\US<:H \ND LOME DISSECTING, TYPES U, W AND Y. Thrso tliree typos of dissecting 
 Miciosto]K?s art supplii (1 in varying outfits as given in the price list below or in special outfits as may 
 be requiied Ihc spec ifications of the stands are as follows with a list of regular equipment and prices:— 
 I Lena Arm— Jointed ao thjt tlie entire field of stage mav he covered; maximum distance from center of pillar to center of lens, 80 
 
 Type LI. 
 
 Focusine Adjustment B n 
 
 a " of si I 
 
 ne oost 
 
 
 ge 17 mm. 
 
 
 Stage 
 
 CI 
 
 
 
 a> le second et 
 
 
 for Mack and whil« met-al plate, supplied for use a 
 
 
 
 opaj p 1 
 
 ekero nd 
 
 rr ng rl ps 
 
 ittacl ed 
 
 
 1 sts mav be attached to edges of support. 
 
 
 ' Focusing Adjusin 
 
 nl P 
 
 
 1 
 
 
 J on e tber aide, giving a range of 60 mm . 
 
 Type W. 
 
 : Hand Rea 
 
 
 
 
 
 
 and detachable. 
 
 
 Lens 
 
 L 
 
 
 
 
 
 
 distance from center of pillar to center o( leni.. ilO niir 
 ovable support provided for attachment of Abbe Came 
 
 
 
 
 
 1 Focus 
 
 dj FT 
 
 
 
 
 
 n e tl r side; range, 60 mm. 
 
 Type Y. 
 
 1 Miage 
 
 PI 
 
 t 1 
 
 
 
 
 
 th sta.,e for black ami white metal plate, supplied for u 
 
 
 1 
 
 
 firaq p 
 
 1 ackgrr> n 
 
 1 en-tra lont Bonne clipa attarhed to ata 
 
 j;e support 1 o!es for hand rests in edges of stage support. 
 
 
 ' Hand 
 
 Rei 
 
 ts-Ma 
 tfifs. 
 
 Oiiini 
 
 ogan IGO 
 
 n n long 
 
 ttar-heJ to edg 
 
 p^ of support 
 Lenses 
 
 aTl stead i by metal frames; detachable but included i 
 
 
 
 
 Focal Lengths 
 
 
 Formulae Camera Lucida Prke 
 
 318(10. 
 
 III 
 
 
 
 25 mm 
 
 
 llniiblct 6.75 
 
 31S64. 
 
 
 
 U2 
 
 
 38 mm 
 
 
 in mm 
 
 Dnublof 7.50 
 
 318e,S. 
 
 
 
 U3 
 
 
 
 2.5 mm 
 
 
 C.^IJinLiton 7.25 
 
 31872. 
 
 
 
 U4 
 
 
 ;JS Hini 
 
 
 1(1 II im 
 
 Coa,limitun 8.50 
 
 31876. 
 
 
 
 vr> 
 
 
 
 25 mm 
 
 
 Triple Aplanat 9.50 
 
 31880. 
 
 
 
 (m; 
 
 
 25 mm 
 
 
 13 nun 
 
 Triple Aplanat 13.00 
 
 31884. 
 
 
 
 H li 
 
 
 A[etal Hand Rests f 
 
 n- Type U 
 
 per pair— .75 
 
 31888. 
 
 
 
 W 1 
 
 
 
 25 mm 
 
 
 Doublet 9.00 
 
 31892. 
 
 
 
 W 2 
 
 
 3S mm 
 
 
 19 mm 
 
 Doublet 9.75 
 
 318%. 
 
 
 
 U 3 
 
 
 
 25 mm 
 
 
 Coddington 9.50 
 
 31900. 
 
 
 
 W 1 
 
 
 3S 1,1 lU 
 
 
 19 mm 
 
 Coddinston 10.75 
 
 31904. 
 
 
 
 \y r, 
 
 
 
 25 nmi 
 
 
 Triple Aplanat 11.75 
 
 31908. 
 
 
 
 w a 
 
 
 2.'> mm 
 
 
 1 3 nuu 
 
 Triple Aplanat 15.25 
 
 31912. 
 
 
 
 Y 1 
 
 
 
 25 nmi 
 
 
 Doublet 17.00 
 
 319 IG. 
 
 
 
 Yl' 
 
 
 38 mm 
 
 
 1!) mm 
 
 Doublet 17.75 
 
 31920. 
 
 
 
 Y3 
 
 
 
 25 mm 
 
 
 Coddington 17.50 
 
 3192'!. 
 
 
 
 Y4 
 
 
 38 mm 
 
 
 19 mm 
 
 Coddington 19.00 
 
 31928. 
 
 
 
 \ r^ 
 
 
 
 25 mm 
 
 
 Triple Aplanat 19,75 
 
 31932. 
 
 
 
 Y(i 
 
 
 34 mm 
 
 
 17 nuu 
 
 Triple Aplanat 23.25 
 
 31 936. 
 
 
 
 Y7 
 
 
 38 mm 
 
 
 W mm 
 
 Hastings Triplet 31.25 
 
 31940. 
 
 
 
 Y8 
 
 
 3S mm 
 
 
 19 mm 
 
 Hastings Triplet Abbe Xo. 32044 41.25 
 
MICROSCOPE ACCESSORIES, BAUSCH AND LOMB. 
 
 Objectives— The 4 mm (l in.) objective is supplied in two types of different N. A. The 0.65 N. A. is 
 distinguished by an extraordinarily long worliing distance, which enables the objective to focus 
 easily through the thickest cover-glass of the Thoma-Zeiss Haemacytometer. 
 The 4 mm objective of 0.85 N, A., with less working distance and less depth of focus than the 0.65 
 N. A. type has the advantage of greater resolving power. 
 
 Equiralenl Focus 
 
 
 Calaloe Number 
 1005 
 
 Millimel*rs 
 
 48 
 
 Inches 
 
 Numerical 
 Aperture 
 
 Working 
 DiBtance 
 
 Micrometer Values 
 Willi t>,4 X Ocular 
 
 Price 
 
 31944. 
 
 ■> 
 
 08 
 
 53 
 
 0,087 = 87/i 
 
 4.00 
 
 31948. 
 
 1009 
 
 32 
 
 1 
 
 0.10 
 
 38 
 
 044 -44 m 
 
 4.00 
 
 31952. 
 
 1021 
 
 16 
 
 
 0,2,5 
 
 7,0 
 
 OOIS - ISp 
 
 5.00 
 
 31956. 
 
 1027 
 
 8 
 
 
 50 
 
 10 
 
 0OS5 - 8,5 m 
 
 8.00 
 
 31960. 
 
 1029 
 
 41. 
 
 
 6,5 
 
 0,6 
 
 0,0040= 4,0 ,. 
 
 8.00 
 
 31964. 
 
 1031 
 
 4S 
 
 
 0.85 
 
 0,3 
 
 0,0040= 4,0 (. 
 
 8.00 
 
 31968. 
 
 1035 
 
 3 
 
 
 0,85 
 
 0,2 
 
 0,0029= 2,0 M 
 
 8.00 
 
 31972. 
 
 1041 
 
 19 
 
 l\ 
 
 1,30 
 
 0,13 
 
 0,0018 - 1.8 m 
 
 27.00 
 
 31976, 
 31980, 
 31984, 
 31988 
 31992, 
 
 32020. 
 32024. 
 
 Oculars — The Huyghenian Oculars are of 23 mm outside diameter and are interchangeable witli all 
 modern European oculars sucii as Zeiss, Leitz, etc. If oculars are ordered for the old American 
 size, i. e., 25 mm outside diameter, this fact must be stated in ordering. 
 
 Approximate Equivalent Focus 
 
 Catalog Number 
 1100 
 1101 
 1102 
 1104 
 1106 
 Substage Condensers- 
 
 H 
 
 Price 
 
 1.50^ 
 
 1.50 
 
 1.50 
 1.50 
 
 Magnifying Power Millitnelers 
 
 " 5 " X "50" 
 
 6.4 X 40 
 
 7.5 X 33 
 10 X 25 
 12.5 X 20 
 
 ■The usual Abbe Condensers are neither chromatically nor spherically corrected, 
 but for all ordinary work serve their purpose very well- Their function is to send light through 
 the object under an angle sufficiently large to fill the aperture of the objective with light. They 
 are furnished in two numerical apertures: 1.20 N. A., containing two lenses, and 1.40 N. A. con- 
 taining three lenses. The Aplanatic Condenser 1.40 N, A., consists of three lenses — an over 
 hemispherical, a meniscus and a double convex, which has a spheroidal surface for correcting 
 the spherical aberration. The spherical correction obtained in this way is of the highest de- 
 gree and perfect for all zones of the condenser, a result that has not been reached by any other 
 construction. The lenses are separable, and the condenser, with the upper lens removed, gives 
 a numerical aperture of 0.60; with both lenses removed, one of 0.40. The quality of correction 
 in each case is of the same high order as that of the complete combination. 
 
 The Achromatic Condensers are corrected for two colors and spherically corrected for two zones. 
 They are recommended for work where it is essential that a sharp image of the light source, free 
 from color fringes, be projected into the plane of the object. The iris diaphragm is located 
 between the lenses. 
 
 Abbe Condenser 
 
 Abbe Condenser 
 
 Aplanatic Condenser 
 
 Achromatic Condenser 
 
 Achromatic Condenser 
 —This Condenser is interchangeable with the Abbe Condenser, and can be 
 applied to any Bausch & Lomb Microscopes fitted with either the screw or the complete substage. 
 It consists of a reflector so constructed that the rays are made to strike the object at oblique 
 angles, corresponding to numerical apertures between 1-00 and 1.40, allowing only those rays 
 to reach the eye which are diffracted by the object. The result is that a dark field is produced 
 in which objects appear brilliantly illuminated. Objectives having numerical apertures between 
 1.00 and 1.40, such as the oil immersion 1.30 N.A., must be provided with a funnel stop, when 
 used with this condenser, in order to reduce the numerical aperture to less than 1.00. For suc- 
 cessful operation a powerful light source is required. See discussion under Micro Lamps, Printed 
 directions are enclosed with each illuminator. In centering mount with iris diaphragm. . . 11.00 
 
 Funnel Stop for oil immersion objective, when used for dark field 40 
 
 Nosepiece, Double, new dust proof form accurately centered and par-focal for 16 mm and 4 mm 
 
 objectives 4.00 
 
 Nosepiece, Triple, accurately centered and par-focal for 16 mm, 4 mm and 1.9 mm objectives 5.50 
 
 
 
 EandL 
 
 
 Catalog Number 
 
 31996. 
 
 
 1740 
 
 32000. 
 
 
 1742 
 
 32004. 
 
 
 1743 
 
 32008. 
 
 
 4535 
 
 32012. 
 
 
 4537 
 
 32016. 
 
 Dark-Field 
 
 Condensers- 
 
 
 Equivalent Focus 
 
 
 
 
 
 
 
 
 Aperture 
 
 Millimeters 
 
 Inches 
 
 Thickness 
 
 Price 
 
 1,20 
 
 12,0 
 
 i 
 
 1..80 
 
 7..50 
 
 1,40 
 
 8 7 
 
 ^ 
 
 0,90 
 
 9.00 
 
 1,40 
 
 12,0 
 
 
 2,00 
 
 22.50 
 
 1.00 
 
 12 
 
 1 
 
 1,90 
 
 25.00 
 
 1.40 
 
 13,0 
 
 i 
 
 0,90 
 
 30.00 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 32032. Mechanical Stage, Model A, for attaching to the pilhir aljove the stage of Bauseh and Lomb Micro- 
 
 scopc^i BI I , BBH 17.00 
 
 3203fi. Mechanical Stage, New Model, for clamping to the side of the stage of any Microscope provided with 
 :l sqii.ire or rectangular stage. Scale reads 75 mm forward and 55 mm backward, with verniers 
 reading lo 1 10 uirn. Bangc permits cxaminatinii of :^lid^'^^ 50x75 mm from corner to corner. 
 
 Valuable for examining serial sec'l ions, ctr 16.00 
 
 32040. Abbe Camera Lucida, Model A, simple form , . 8.00 
 
 32044. Abbe Camera Lucida, Model B, with extension arm for the mirror and moderating glasses 10.00 
 
 32048. Abbe Camera Lucida, Model C, with centering screws, two series of moderating glasses and extension 
 
 arm for the mirror 17.00 
 
 32052, Drawing Board, Stationary. 11x9 inches, designed particularly for use with Model A Abbe Camera 
 
 Lucidii 1.50 
 
 .'i205fj. Ocular Micrometer Disc, for use on diaphragro nf niidar, ruled ti> 0.1 mm with rv(-r\' tenth line num- 
 bered 1.25 
 
 .320(10. Ocular Micrometer Disc, for use on diaphragm of ocular, ruled iu 0.5 mm squares with every second 
 
 line on two adjacent sides numbered 2,00 
 
 32(Hi4. Ocular Micrometer Disc, for use on diaphragm of ondar, ndcd in 1.11 mm squares, with every line on 
 
 two adjacent sides numbered 1.75 
 
 32(ll>8. Ocular Micrometer Disc, Whipple, for counting bacteria, consisting of a large square divided into four 
 squares, one of which is subdivided into twenty-five squares, and one of these again subdivided 
 
 into twenty-five squares 3.50 
 
 Note — Unless oth<'rwiHe specified the above Ocular Micrometer Discs are furnished of 23 mm diameter 
 to fit all standard oculars as at present constructed. If for older microscopes with larger diam- 
 eter of oeul.ir dimensions must be given with order. 
 
 32072. Micrometer Eyepiece, with movable scale divided in 0.1 mm 8.00 
 
 3207f;. " " " fixed scale divided in 0.1 mm 4.00 
 
 32080. Filar Micrometer— A micrometer screw acts on a slide that carries a movable wire. One revolution 
 of this screw moves the wire 0.5 mm across the field. This screw has a drum head divided into 
 50 parts, one part, therefore, being equal to 0.01 mm. One-tenth of this interval (equal to 0.001 
 mm = 1 (k) can easily be estimated. A fine line running through the center of the field, parallel 
 to the axis of the screw, serves as a guide in orienting the object with reference to the direction 
 of motion of the movable wire. A glass scale placed in the field and ruled in intervals of 0.5 mm 
 each serves for counting the full revolutions of this screw. Every second interval of the scale 
 is numbered. The eyepiece, which can be focused on the movable wire and scale, is of the 
 
 Ramsden type and has an equivalent focus of 20 mm (12.5 X) 25.00 
 
 320S4. Stane Micrometer, on glass slide 75 \ 25 mm, ruled to 0.1 and 0-01 mm 3.00 
 
 32088. " " " " " •' " " " " " 0.01 an<l 0.001 inch 2.00 
 
 316 
 
3209(5. 
 32100. 
 32104. 
 
 32108. 
 32112. 
 3211G. 
 32120. 
 
 32124. 
 321 2S. 
 32132. 
 
 3213(i. 
 32 138. 
 
 .Micro Drawing Apparatus, a new :\ni.l uonvenicut airjiiiiiiiucNi lur tlir iisr nf ;lii unliii 
 
 ill ilrawiiiff ; suitable for use with i)ov\'ers from .50 tn I ii il i i -■ I u' --' I'l.lir I 
 
 of 111 iiiclie.s being fixed, the pencil is operated with ii. ■ i r i ■ ■ i . i i ■ 
 
 porlimt feiiture wbere much work is to be done. I'u, ii inrl.iilc- .h .n'. .uli - j-L n 
 
 ;irr lamp and rheostat for 110 vol Is, 4 iuupores, with piui; and curd liul, withouHim 
 Drawing Board, only, with ^ii|i|iih I liir tlic microscope, clamp and light shield. 
 Mirror, only, with clamp for dr;;« titltr. 
 
 Micro Drawing Apparatus, simihir lo :il>nvc in up 
 scope, permitting alterations of the piiijcfli 
 ing board, mirror, hand feed arc lain]) :nnl i 
 
 scope 
 
 Adjustable Drawing Board, only, w'.il 
 
 Polarizer, for use interchangeably with :ii I ''.■■, . 
 
 Polarizer, same a.s No. 32112, but with li ■■:■ i . 
 
 Analyzer, for use with either of the abovr I'm! i' i/.i' 
 the objective. 
 
 Analyzer, for attaching to draw tube above the o( 
 
 Turn-Table, for ringing mounts and making cells 
 
 Bulls-Eye Condenser, for the illumination of opaque nhjeii 
 ficial sources of light. On adjustable stand. 
 
 Diameter of lenses, mm 3S "ifi 7-5 
 
 Each 3.00 -5.00 7.00 
 
 Vertical Illuminator, for ill luiiina ting opaque objects, particularly metal surfaces; for attaching 
 in. mediately above the objective 6.50 
 
 Vertical Attachment, new form, with bulls-eye condensing lens and iris diaphragm attachnient. 15.00 
 
 distance 
 i, an im- 
 :uid feed 
 J.. 2.5.00 
 .. 3.50 
 .... 2.50 
 
 ration hut with adjustable support for the micro- 
 
 n .iist:irier iirlwerti inirror and paper. With draw- 
 
 ensi;Ll Ini- I 10 vi.lts, 4 aniperes, but without micro- 
 
 .. 27.50 
 
 I f,„ II . ■ .,.„„. , l.rii ■! 11 'lif -iK.'ld... 6.00 
 
 „ .■ , ., . -,, ,- . . i"', ,„, . ■■■■ I . . . 12.00 
 .;, ,, ,. ,1 ',. ., i, , ■ I , gs 15.00 
 
 , l"i,l I I I -irlilM" 111 I lie IMIrHi-r-ilJc lllillii'illnl rlv aboVe 
 
 7 •■ 10-00 
 
 il'u-; wilh y,radaated disc to measure angle. . . 15.00 
 
 4.00 
 
 to secure parallel beam from arti- 
 
 \Vc have found it difficult to comprehensively and clearly present the two makes 
 of Microscopes and Accessories i Bausch & Lomb and Zeiss) in the space at our disposal 
 in this catalogue. We believe those familiar with Microscope equipments will find no 
 difficulty in securing the information necessary to the selection of outfits from the ma- 
 terial listed on these pages but we emphasize our desire to send upon application the 
 original catalogues of both Carl Zeiss and Bausch & Lomb Optical Co. with such addi- 
 tional and more specific information as we have gathered in an experience of over 
 twenty years in the sale of Microscopes. 
 
No. 32141— Slaiid IB wilh Tripio Nor 
 
 ?, Objei 
 
 MICROSCOPE, ZEISS STAND I. This is the standard Microscope throughout the civilized world for the 
 most refined investigations by ocular observation, photo-micrography and micro projection; the large 
 bodvtube permits the use of projection objectives and micro planarswith full use of the emergent beam. 
 Thetae stands ire 11 jf the hindle arm tjpe ii shown m illu tration The finish and mechanical 
 adjustments of tl e&e Microscopes represent the highest de\ elopment ot m tr i ent i il ins is applied 
 to optical mstrumerf 
 
 Fine Adjustment— B P e. r lo 117 
 
 Slatea — The pla n re I ng ol ug mwhani- 
 
 cal stage as ahovm r as a pxt.ra ancBs- 
 
 soT\ for mterctaneeah 
 
 L le w th the o I 
 
 ndIO snotinter- 
 ^ncs to the large 
 t3 extremely slow 
 
 th 
 
 Illumlnalfng App 
 
 
 1 
 
 1 of the movable stop 
 
 paratus n tl 4bbe condenser system 
 j,ph c work part cularlj with objec- 
 er or to the regular Abbe aj'stem and 
 phj 1 to be a o 1 1 shed with objec- 
 unQde la a con lele photij- 
 
 tleref ■ 
 tl e'^ of le 
 
 Thp Stands are all furnished m hne poliihed mahogan\ cases and ] ices do net inclu le oculars, 
 
 Tiosepieces or objectives. I'or prices on Complete outhts see page 323. 
 
 Stand lA, with plain revolving and centering vulcanite stage and Abbe condenser of 1.40 N. A. 
 
 Duty Free 81.25 Stock 100.75 
 
 Stand IB, with large revolving mechanical stage and Abbe condenser of 1.40 N. A. 
 
 Duty Free 100.00 Stock 124.00 
 
 Stand IC, with special photo-micrographic stage, aplanatic condenser of 1.40 N. A. and set of accessory 
 fittings for photo-micrography, consisting of a light-proof connecting funnel, light-proof connect- 
 ing sleeve, adapters for the attachment of Microplanars, centering diaphragm, moderating glass 
 and revolution counter. 
 Duty Free 112.50 Stock 139.50 
 
ARTHUR H. THOMAS COMPANY 
 
 D-revolving at 
 
 No 3215b— Stand III C\ Hilh Triple Nosepiece Ocular and Objeclives 
 
 MICROSCOPE, ZEISS STAND III. This is the most widely used of the new series of Zeiss Microscopes with 
 handle arm and Berger fine adjustment. It is identical with Stand I with the exception of large body 
 tube and the finish of the base which in Stand III is of crystallized lacquer instead of smooth black. 
 For all ocular observations, therefore, this stand meets the requirements of the most refined investiga- 
 tions but is not recommended for a wide range of use in photo-micrography and micro-projection 
 because of the narrow or standard tube. Special attention is called to the four types of stages fur- 
 nished as regular equipment with this outfit. With the exceptions above noted this stand is identical 
 in finish and mechanical adjustments to Stand I, 
 
 Pine Adjustment— By Berger slow motioa with aide wheel, firat introduced by Zeiss 
 
 Stages — The fixed round sta^e furnialied as regular equipment with Stand IIIC 
 
 stage furnished as regular equipment with Stand IIICA isa nt 
 
 ward and forward movement by operating two screws jointly 
 
 opposite directions, with a range of displacement of 10 nam. T 
 
 poses aa satisfactory as the largo mechanical stage. This 
 
 furnished as regular equipment for Stand IIICB. The pi; ^ ^. - , . , - , . .-■ , 
 
 equipment with Stand HID is the same as supplied with btand L4. and the large revolving mechanical stage supplied a^ 
 
 re"Tjl3r equipment to Stand IIIE is the same as supplied with Stand IB. All of these stages are interchangeable and can 
 
 be" supplied as acceaaory equipment after the purchase of the regular niioroscope. 
 
 Illuminatiiis Apnaratug— Those Stands are all furnished with the complete Abbe Illuminating Apparatus with Abbe condenser 
 
 system of 1.40 N.A. as regular equipment. For very refined work we particularly recommend the addition of aplanatic 
 
 condensing system of 1.40 N.A, or the achromatic centering condenser of 1.00 N.A. 
 
 The Stands are all furnished in fine polished mahogany cases and prices do not include oculars, 
 nosepieces or objectives. For price on Complete outfits see page 323. 
 32152. Stand IIIC with fixed round stage and Abbe Condenser of 1.40 N. A. 
 
 Duty Free 63.75 Stock 79.05 
 
 32156. Stand IIICA with simplified non-revolving mechanical stage and Abbe Condenser of 1.40 N. A. 
 
 Duty Free 66.25 Stock 82.15 
 
 32160. Stand HID with plain revolving and centering vulcanite stage and Abbe Condenser of 1.40 N. A. 
 
 Duty Free 72.50 Stock 89.90 
 
 32164. Stand IIIE with large revolving mechanical Stage and Abbe Condenser of 1.40 K. A. 
 
 Duty Free 91-25 Stock 113.15 
 
 a in diameter. The simplified mechanical 
 fitted mth a movable plate giving a back- 
 motion by operating the same screws in 
 has been found a great convenience and for many pur- 
 ipliSed mechanical stage is also arranged as a revolving stage 
 revolving and centering vulcanite stage furnished as regular 
 
ART 1-1 UR H. THOMAS COMPANY 
 
 32170. 
 
 Swingoul Condenser Mounting, for Abbe i'ond ns i ot 1 1(1 N \ It uiJcred with Stands ]A, IB 
 lilC, \Ur.A, HID, or HID, extra 
 
 Duty Free 6.25 Duty Paid 7.75 
 
 Noro.— Th.ArikuiiilicrondeTiKerof 1.40N.A.;isfurnLshpdon Stand IC is not aduptublo to tlie KWineout mounting. 
 REVOLVING STAGES, ZEISS. The Plain Revolving Vulcanite Stage as well as tlir- Lai'ge Revolvinjc Me- 
 chanical Stage may he ordered separately at any time for use with both Stands I and III or may be 
 ordered as additional accessories at the prices given below. 
 32172. Plain Revolving Vulcanite Centering Stage, onlv 
 
 Duty Free 6.2.5 ' Stock 7.75 
 
 -32176. Large Mechanical Revolving Stage, with center housing. 
 
 Duly Free ,, 25.00 Stock 31.00 
 
 32180, Center Housing, for use with plain revolving vulcanite stage or large mechanical stage. 
 
 Duty Free 4.25 Duty Paid 5.27 
 
 SUBSTAGE CONDENSERS, ZEISS. The following Condenserw all f^t interehangeablv into the upper sleeve 
 of the iiirii|)Wtc AI.Im. [lIiuiiiTKiTiTijT Apparatus. Tn i],r Miir,~ nf ^i:nuU I and III previously listed we 
 lia\-i' im-hulrd < 'mnli ij-ii - rj i l.i' price but here li^i i Im mi -iiLirui rl\- « ilh ailditional systems for special 
 wnrk fi>r read\' n-rei I'lii ( ii i i.i l^ mg up the prices nl - ; .i ■■i.i i . m! lit -.. 
 Abbe Condenser, Uate U■ll.^ ^.\stem, 1.40 N. A., e((iu\;ili m foms N nun. 
 
 Duty Free 6.25 Stock 7.75 
 
 Aplanatic Condenser, 1.40 N. A., equivalent focus 10 mm, particularly reconunended for phntomi- 
 rrngrai>}iv ^^■ith high power objectives of wide aperture. 
 
 Duty Free , 15.00 Stock 18.60 
 
 Noll — 'l*lii' I Mint liii.- <,i I. . , ' , |. - . Ill, Li; roTidensers maybe removed and the remaining lenses used as a long focus Condeni^er of 
 ■-111:111 :i|nTtii[i' i. I |. ■■ I rk When the complete set is used with objectives of laree aperture the Condenser .should 
 
 Centering Athronialii Condenser (if 1.0 N. A., equivalent focus 14 mm. This condensing system has 
 ail iris diaphragm iiioioited between the lenses and the iris diaplinigin .if the Ablie Illuminating 
 .\l)pa)atus shnuld. tberefnre, reu];iin opened when this eimih'iiser is used. This Cundeiiser is 
 r<'coTomeml<>d fm- the Tiiust retinerl investigations in bol h i.niiai- and mirr.i|ilintograidde .ibser- 
 vatiuus with nlqerlives up to 1,0 X. A. and for best results sliouhl be u.sed in inuoeision contact 
 
 with the slidr. 
 
 Duty Free 18.75 Stock 23.25 
 
 Condenser, Quartz, of ].Mt N". A. with interchangeable upper part i-eduring the aperture tu (I.S. For 
 
 use in wr.i'k \\ith the Clti a-\"iulet as in the Luminescence ?>lieroseiipe. 
 
 Duly Free 17.50 Stock 21.70' 
 
 *'ondenser Paraboloid, fm d irk h< Id illumination 
 
 321 84. 
 32188. 
 
 32192. 
 
 32I9(;. 
 
 32200. 
 32204. 
 
 Duti Free 
 Piriboloid Stops 
 
 ■ /M 
 
 10 00 
 
 \(hiomitiL ()b| 
 IS md less 
 
 Stock 
 
 (O)]) ] 1' I 
 
 ,d \,uMln 
 
 12 40 
 
 ' Arc Lamp iSo J2b4h page J31 or i\e 
 let w ith the slide carti being taken to a' 
 ■n IS obtained bi total reflection at the ci 
 
 OCULARS ZFISS 
 
 n< 111 I - I Irii I li I I II I I II I I lul,l 
 
 ID'I " II I II 'III I n]in 
 
 01 M ' ll h M III I I til I HLi 
 
 sitint,"'. iilir^ (liM piiniit III. UM -I tin i\e it 
 thf inti!( hrhf m virw 
 32208. Zeiss Huyghenian and Orthoscopic Oculars. 
 
 ~ \Mth \. III'. Ill ill. 
 
 1 II- II. IM, iiifii. n 1 
 
 '\ ^'HHfolt'!bl'(".'i'lsl I 
 
 1 > i"ii hromatic Objectives 
 I'll-. The Compensating 
 il I. . 1 i\es of considerable ap- 
 1 )b|. . tues DD E, F and ,'- 
 I'l I.M use with ■\ehromatit 
 \s Lii the rise of Compen- 
 u. ( ibo\. thf e\( lens n ith 
 
 Huyghenian 
 
 Orthoscopic 
 
 Dosipnalioii Nii 
 iMluivnl.-iil fori 
 MaEiiifiraluni . 
 
 Dutv Free 
 
 SlOfk 
 
 1. 511 
 1 .86 
 
 1 .51! 
 1 .8(1 
 
 1 ..")() 
 1.8(1 
 
 ^^9,:. 
 
ZEISS ACHROMATIC AND APOCHROMATIC OBJECTIVES, HUVGHENIAN, ORTHOSCOPIC AND COM- 
 PENSATING OCULARS. The tables on bottom of prefe'Hnt; |.;ik<' :ni(l those on this page give the 
 principal optical data and prices. Please always specify focal k'ugth in addition to catalogue number 
 in ordering. The information on this page with tho tables of magnification on the following p:i(ie 
 will be found of great assistance in selecting the optical equipment for Zeiss Microscopes. 
 
 32212. Compensating Oculars. Zeiss. 
 
 Designation 
 
 Equivalent focus, 
 
 2 
 
 70 
 
 4 
 
 30 
 
 5.00 
 B.20 
 
 6 
 
 33 
 
 
 
 
 5.00 
 6.20 
 
 5.00 
 
 Slock 
 
 (i.20 
 
 7. .50 
 9. .30 
 
 Achromatic Objectives. Zeiss. 
 
 32216. 
 
 
 An 
 
 32220. 
 
 
 
 32224. 
 
 
 
 32228. 
 
 
 
 32232. 
 
 
 
 32236. 
 
 
 aa 
 
 32240. 
 
 
 
 32244. 
 
 
 
 32248. 
 
 Drv Series 
 
 
 32252. 
 
 
 
 
 
 
 32260. 
 
 
 tDD 
 
 32264. 
 
 
 tDD with c(.rr<.di«n c»l 
 
 32268. 
 
 
 
 32272. 
 
 
 tC with correclion coll 
 
 3227«. 
 
 
 
 32280. 
 
 
 tF wllh correction coll 
 
 32284. 
 
 
 PI 
 
 32288. 
 
 Water 
 
 
 32292. 
 
 Immersion 
 
 
 32296. 
 
 
 J Hilhcorrcctiun colla 
 
 32300. 
 
 Homogeneous 
 
 1-12 Incti 
 
 32304. 
 
 Immersion 
 
 
 
 
 HuyKtienI 
 
 n Ocular 1' 
 
 
 
 
 
 with ItiO 
 
 nm tube 
 
 
 
 
 Numcrica 
 Aperture 
 
 Free work- 
 ing distance 
 
 Kth 
 
 Diameter 
 of held of 
 
 Duly Free 
 
 .Slock 
 
 4 
 
 
 
 32 
 
 14 
 
 3.00 
 
 3.72 
 
 43 
 
 — 
 
 01 
 
 10 
 
 3.00 
 
 3.72 
 
 37 
 
 — 
 
 43 
 
 7 5 
 
 3.00 
 
 3.72 
 
 28 
 
 — 
 
 ■27 
 
 5 2 
 
 3.00 
 
 3.72 
 
 43-29 
 
 — 
 
 10-42 
 
 9-20 
 
 10.00 
 
 12.40 
 
 26 
 
 0,17 
 
 ]4 
 
 4 
 
 6.75 
 
 8.37 
 
 15 
 
 0,20 
 
 9 
 
 2 
 
 5.00 
 
 S.20 
 
 17 
 
 30 
 
 7 5 
 
 2,5 
 
 7.50 
 
 9.30 
 
 12 
 
 35 
 
 3 
 
 1,5 
 
 7.50 
 
 9.30 
 
 
 40 
 
 IS 
 
 9 
 
 7.50 
 
 9.30 
 
 4 2 
 
 65 
 
 
 
 5 
 
 8.75 
 
 10.85 
 
 4 3 
 
 n 85 
 
 4 
 
 5 
 
 12..50 
 17.50 
 
 15.50 
 21.70 
 
 ■J 8 
 
 !I0 
 
 25 
 
 .35 
 
 15.00 
 20.00 
 
 18.60 
 24.80 
 
 1,8 
 
 <10 
 
 0,17 
 
 0,23 
 
 18.75 
 23.75 
 
 23.25 
 29.45 
 
 ■ ,;^ 
 
 U,ll 
 
 311 
 
 4 
 
 5.00 
 
 6.20 
 
 4 4 
 
 75 
 
 1 5 
 
 .''.5 
 
 18.75 
 
 23.25 
 
 1 S 
 
 1,1,S 
 
 0,2 
 
 23 
 
 27.50 
 32..50 
 
 .34.10 
 40.30 
 
 l.S 
 
 1,25 
 
 15 
 
 25 
 
 25.00 
 
 31.00 
 
 1,8 
 
 1,30 
 
 0,13 
 
 22 
 
 35.00 
 
 43.40 
 
 t Flnorite system. 
 
 Apochromatic Objectives, Zeiss. 
 
 with Compeusatin 
 
 Ocular 4 at 16U mn 
 
 tube lenglh 
 
 Duty Free Stock 
 
 32308. 
 32312. 
 32316. 
 32320. 
 
 32324. 
 
 32328. 
 32332. 
 32336. 
 32340. 
 32344. 
 
 Dry Series 
 
 Water Immersi 
 
 Homogeneous 
 Immersion 
 
 0,30 
 
 65 
 0,95 
 0,95 
 
 1,25 
 
 1,30 
 1,40 
 
 1 30 
 1,40 
 1 30 
 
 31 
 63 
 
 83 
 
 5 
 
 1,0 
 2 
 15 
 
 II) 
 12 
 
 09 
 
 0,45 
 35 
 
 25 
 
 35 
 35 
 25 
 25 
 20 
 
 20.00 , 24.80 
 
 25.00 I 31.00 
 
 35.00 3.40 
 
 40.00 49.60 
 
 62.50 
 
 75.00 
 100.00 
 
 75.00 
 100.00 
 
 87. .50 
 
 77.50 
 
 93.00 
 124.00 
 
 93.00 
 124.00 
 108.50 
 
MAGNIFICATION TABLES FOR BAUSCH & LOMB AND ZEISS OBJECTIVES AND OCULARS 
 
 mputed upon the baaisortube 
 
 
 ' Magni- 
 
 Size of 
 
 Mflgni- Size of 
 
 Magni-l Size of 
 
 Magni- 
 
 Size of 
 
 fi cation field 
 
 fication 
 13 X 
 
 field 
 9.0 mm 
 
 15 X 
 
 field 
 8.5 mm 
 
 fi patio Q 
 20 X 
 
 field 
 
 fioation 
 25 X 
 
 field 
 
 10 X 10,5 mn 
 
 8 8 mm 
 
 20 X 
 
 5.5 mi 
 
 2BX 
 
 4.8 mm 
 
 30 X 
 
 4.3 mn 
 
 40 X 
 
 4 4 ran 
 
 , 50 X 
 
 
 50 X 
 
 
 Hi X 
 
 1 85 mm 
 
 75 X 
 
 1.70 mm 
 
 ; 100 X 
 
 1.74 mn 
 
 1 125 X 
 
 1.38 mm 
 
 100 X 
 
 1.02 mn 
 
 laox 
 
 O.yOii.m 
 
 150 X 
 
 0.83 mm 
 
 , 200 X 
 
 0.85 mm 
 
 260 X 
 
 
 215 X 
 
 0,48 mn 
 
 , 275 X 
 
 0,43 mm 
 
 320 X 
 
 
 1 430 X 
 
 0.40 mm 
 
 , 590 X 
 
 0.32 mm 
 
 
 0,36 mn 
 
 ; 365 X 
 
 0.32 mm 
 
 420 X 
 
 0.29 mm 
 
 570 X 
 
 0.30 mm 
 
 740 X 
 
 0.24 mm 
 
 475 X 
 
 0,22 mn 
 
 610 X 
 
 0.19 mm 
 
 720 X 
 
 0-17 mm 
 
 1 860 X 
 
 
 1260 X 
 
 
 Table of Magnification! 
 
 lube length and 
 
 16 
 
 
 
 4 
 
 125 
 
 
 3 
 
 167 
 
 
 2^ 
 
 300 
 
 
 2 
 
 250 
 
 
 1.5 
 
 
 
 r. 
 
 12 
 
 IS 
 
 187 
 
 
 375 
 
 562 
 
 750 
 
 1125 
 
 1000 
 
 1500 
 
 1200 
 
 noo 
 
 1500 
 
 2250 
 
 2000 
 
 3000 
 
 ind OrlhosGOpic Oculars 
 
 leo mm tube length 
 Orthoscoplc Oculars 
 
 Table of Maanifica 
 
 , Witl 
 
 54 
 
 
 With 
 
 vilh Paired Ocular 
 
 40 
 
 030 
 
 1650 
 
 540 
 
 2500 
 
 100 
 
 
 650 
 
 1050 
 
 570 
 
 2540 
 
 570 
 
 2540 
 
 s when 
 
 used on 
 
 30 
 
 35 
 
 pbragm phragm 
 
 ^i'- PB ^ "W "»!£- ™E"! "sJ- |"E" "ss^p^^ 
 
 20 5 31 I 3.3 i 37 3 
 
COMPLETE ZEISS M 
 
 With the preceiiiii^- iTifmriKil inn ,'is tu Zeiss .^t^iiiils 
 of oculars and objerl i\Tw, cninplctr Zris.s .ml lits i-m h 
 encc of customers wo lis! hrluw coiiiincndahlo outlils m 
 apochroinatic equipmciil.. 
 
 32348. ApochromalicOulfit (in the biisis of Stand lA. 
 i. e., with plain rovnlviiiK viilc;uiil(.' 
 stage. 
 
 Stand lA, with Abbe condi.>nsiT llul) I'Vrc Slooli 
 ori..lO N. A.andplikin rv- 
 volvinc vulcanite slat-e . . . NI.2S l(Hf.75 
 
 Triple Revolving Nuscpii^ce 5.00 e.20 
 
 Corapensalin)! Ocular (i. 5.00 ^.20 
 
 12 TJitI 9.30 
 
 Apochramalic Objective, llj mm 20.00 21.80 
 
 4 mm 3,1.00 43.40 
 
 2 mm 
 
 1.30 N. A 75.00 93.00 
 
 22S.T5 " 283.e5 
 32352. Apochromatic Outfit on the basis of Stand IC 
 stand IC wilh aplanatic con- Duty Free Slock 
 denser of 1.40 N. A. and 
 special stafie and accesso- 
 ries for micro-pholography. 112.50 13!l.50 
 Tube Slide for InlerchanginK ob- 
 jectives 2.00 2.4S 
 
 3 Objective slides (i.On 7.44 
 
 CompensalinE Ocular II 5. 111! (;.20 
 
 Apochromatic Objective. IB mm 20.1111 24.K0 
 
 4 mm 35.01) 43.40 
 
 1-30 N. A 75.00 93.00 
 
 2li3.()0 326J2 
 
 32.55G. Achromatic Outfit on the basis of Stand III- 
 CA. 
 
 Stand IIICA. with simplified me- Duty Free Slock 
 chantcal atai^e and Abbe 
 
 condenser of 1.40 N. A... 6B.2.5 82.15 
 
 Triple Revolving Noscpiece 5.00 ' G.20 
 
 Huyghenian Ocular 2 1.50 1.8B 
 
 4 1.50 1.8H 
 
 Achromatic Objective A .1.00 0.20 
 
 D 8.75 I0.S5 
 
 1. 12" Oil 
 
 Immersion 1.2.i N. A . ... 25.0(1 31.00 
 
 113.00 140.12 
 
 ICROSCOPE OUTFITS 
 
 , sl;ttirf; .-iiid cdnili'nsrrs and lli 
 
 32.'l(il). ApDchromalic Oiitlil n 
 
 Triple Kev 
 
 ic ba.sis (,f stand lli, 
 volviiit; me.'lianioui 
 
 Duty Fre< 
 100.00 
 
 stock 
 
 124.00 
 6.20 
 6.20 
 9.30 
 24JtO 
 43.40 
 
 32364. Apochromatic Outfit on the basis of Stand IlICA 
 
 stand IllCA with simplified me- 
 chanical alai;e and A)>bc 
 canden.ser of 1.40 N. A... 
 
 Triple Bevolvint' Nosepiece ... 
 
 Compensating Ocular li ... 
 12 
 
 Apochromatic Objective. IB mm 
 
 ■ Stock 
 82.15 
 
 323(i8. Apochromatic Outfit on the ha.sis of Stand MIE 
 u-ith lar<i,c revolving nieHianicid sta<;e- 
 
 Sland rUE wilh larKe revolvinfi Duty Free Stock 
 mechanicat slaye and 
 Abbe condenser of 1.40 
 
 N. A 91.25 113.15 
 
 Triple Revolving Nosepiece 5.00 6.20 
 
 Compensating Ocular 5,00 6.20 
 
 12 7,50 9.B0 
 
 Apochromatic Objective, 16 mm 20.00 24.80 
 
 4 mm 35.00 43.40 
 2 mm 
 
 1.30 N. A _ 75.00 93.00 
 
 ~238.75 296.05 
 
 ^ 
 
 
 32.372. 
 
 Portable Outfit, 
 
 on th 
 
 ba^is of 
 
 11? 
 
 
 Stand IV. 
 
 Zeiss TravelinR Sta 
 
 nd IV, 
 
 Duty Duly 
 Free Paid 
 
 
 n 
 
 Double Nosepiece 
 Huyghenian Ocula 
 Achromatic Object 
 
 D.. 
 
 3.75 4.fi5 
 1.50 1 .86 
 5.00 6.20 
 8.75 10-85 
 
 
 
 
 
 
 iil.50 76.26 
 
 
 
 32376. 
 
 Portable Outfit, 
 
 Stand IV. roiiii 
 
 on Ih 
 
 h.'tr fo 
 
 basis of 
 bactcrio- 
 
 
 r 
 
 
 Zeiss Traveling S 
 
 as above . 
 Triple Kevolvina Ni 
 Huyghenian Ocula 
 
 Achromatic Object 
 1-25 N. A 
 
 and ]V, 
 
 sepiece . 
 
 4 .'.'.'.'.'.'. 
 
 ve A 
 
 D 
 -12 inch 
 
 Duty Duty 
 Free Paid 
 
 42.50 52-70 
 5.00 6.20 
 1.50 1.86 
 1.50 t.86 
 5.011 6.20 
 8.75 10.85 
 
 25.00 31-00 
 
 t 
 
 
 
 
 
 89.25 110.67 
 
 Microscope. Zeiss Traveling Stand IV, a new anrl compact Microscope with 80 mm rectangular stage, 
 Rubstage condenser of 1.0 N, A. in a strong, well protected canvas carrying case designed 
 I'spccialh' for use in the tropics, bvit without oculars, nosepiece, objectives or accessories shown 
 in illustration. 
 Duty Free 42.50 Duty Paid 52.70 
 
 Accessories, as shown in illustration, consist ing of forceps, scalpel, scissors, dissecting needles, etc. 
 Duty Free 2.25 Duty Paid 2.79 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 32388. 
 32392. 
 32396. 
 
 32400. 
 32404. 
 32408. 
 32412. 
 32416. 
 32420. 
 32424. 
 32428. 
 32432. 
 
 324.36. 
 
 32444. 
 3244S. 
 
 32452. 
 32456. 
 32460. 
 
 Duty Free 
 5.00 
 3.75 
 
 2.00 
 2.00 
 
 15.00 
 4.50 
 9.50 
 
 13.00 
 1.88 
 2.50 
 2.50 
 
 No. 32404 No. .1215 
 
 Zeiss .Microscopf .\ccessories 
 
 Triple Revolving Nosepiece 
 
 Double Revolving Nosepiece . 
 
 Sliding Objective Changer, Tube Slide recommended for microphotographic 
 
 work on account of accurate centering 
 
 Sliding Objective Changer, Objective Slide. One for each Objective 
 
 Large Abbe Drawing Camera, in case 
 
 Vertical Illuminator, prism form 
 
 " , with iris diaphragm 
 
 Drawing Table, Bernhard 
 
 Ocular Micrometer, 10 to 100 
 
 " Contrast Micrometer, 5 mm, consisting of 50 squares in 0.1 and .05 mm 
 " •' " 10 mm " " 25 " in .4 and .2 mm 
 
 " Screw Micrometer with Ramsden ocular for use with achromatic 
 
 objectives 22.50 
 
 Ocular Screw Micrometer with compensating ocular No. d, for use with apo- 
 
 chromatic objectives 26.25 
 
 Stage Micrometer, consisting of 3 mm divided into iV mm and iV mm divided 
 
 into I ,', „ mm 
 
 Abbe Apertometer for measuring the numerical aperture of micro objectives, 
 Microspectral Objective, Engelmann. See Bat. Zeit. iO, 419-4P.6, 1882 and 
 
 PJlufier's Arch. f. d. ges. Physiol a, 1,86-490, 18SS 
 
 Spectral Ocular, Abbe (Microspectroscope) 
 
 Maltwood Finder 
 
 Ocular, Abbe Stereoscopic, by the use of which any of the Zeiss Stands may be converted 
 
 lar microscope for use with any powers. The_ attachment is adjustable for the 
 
 distance of the observer and should be used with achromatic objectives only. 
 
 revolving nosepiece or with apochromatic objectives is not recommended. 
 
 Duty Free 45.00 Duty Paid 
 
 2.13 
 17.50 
 
 50.00 
 5.00 
 
 Slork 
 6.20 
 4.65 
 
 2.48 
 2.48 
 18.60 
 5.58 
 11.78 
 16.12 
 2.33 
 3.10 
 3.10 
 
 27.90 
 
 2.64 
 21.70 
 
 52.70 
 
 62.00 
 
 6.20 
 
 into a binocu- 
 
 inter-pupiUary 
 
 Its use with a 
 
 .55.81 
 
MICROSCOPE, ZEISS BINOCULAR STAND X, with image ereetiog prisras,^ paired oculars and objectives. 
 This is the original Binocular Microscope giving true stereoscopic vision and which has not only come 
 into wide use of recent years but has been widely copied by other makers. The regular outfit includes 
 the stage and base and the vulcanite fork for attaching when the Microscope is used with the stage 
 and base as a Dermatoscope, as shown in upper right hand corner of illustration. It is also furnished 
 as Stand XB, with rack and pinion elevating motion with extension arm with joint, which arrange- 
 ment has found much favor with geologists, mineralogists, botanists and zoologists. A lower priced 
 form of this stand is now offered for the first time as Stand XB, .Simplified Model. Where one pair of 
 binocular tubes is to be used on both Htand XA and XB, the tubes should be ordered as a part of the 
 Stand XB outfit after which they can be used on the stage and base of Stand XA by means of the 
 Straight Support No. 32476. This Support is also necessary when the Drijner Stereoscopic Camera is 
 used in connection with Stand XA. 
 32464. Zeiss Binocular Stand XA, with base, stage, hand rests for dissecting and vul- 
 canite fork for use with the body tube as Dermatoscope, without objec- Dutr Free stock 
 
 tives or oculars, in mahogany case 48,75 60.45 
 
 32468. Dermatoscope, consisting of the upper part of Stand XA with the vulcanite 
 fork but without stage and base and also without objectives and oculars, 
 
 in case 33.25 41.23 
 
 32472. Vulcanite Fork, only, for Dermatoscope _. l.'yQ 1.86 
 
 32476. Straight Support, for use when the Driiner Stereoscopic Camera is to be used 
 with Stand XA and also when the binocular body of Stand XB is to 
 
 be used interchangeably on stage and base of Stand XA 2.50 3.10 
 
 .32480. Zeiss Binocular Stand XB, on heavy base, with rack and pinion vertical mo- 
 tion and extension jointed arm, without objectives or oculars, in ma- 
 hogany case 65.00 80.60 
 
 32484. Zeiss Binocular Stand XB, simplified model, as shown in illustration, without 
 
 objectives or oculars, in mahogany case 40.00 49.60 
 
 32486. Adapter, necessary for occasional use because it is impossible in either 
 form of Stand XB to lower the tube sufficiently to focus on the plane 
 of the table top or desk on which the base of the stand rests. If this 
 feature is unnecessary this adapter need not be ordered 3.75 4.65 
 
—Outfits involving tijc use i)f ,St:ai(lH XA and XB may be mailc up by ordering the paired ouiilars 
 and objectives listed below. For the convenience of those wishing cither a simple or a toin- 
 plete outfit we list two outfits on the basis of Stand XA as follows: — 
 Binocular Outfit, on the basis of Stand XA giving 32492. Outfit, on the basis of Stand XA giving a 
 
 .ge of magnification from 9 to 40 diam- 
 eters, with fields from 13 to 3.3 mm in 
 diameter. 
 
 range of magnifications from 9 to 103 di- 
 ameters, with fields from 13 to 1 .S mm in 
 diameter. 
 
 Zeiss Binocular Stand XA 
 
 Duly Free Slock 
 48.75 eo.45 
 3.00 3.72 
 3.110 3.72 
 11.25 13.95 
 11.25 13.95 
 77.25 HS.T'J 
 
 Zeiss Binocular Stand XA , . . 
 
 Duty Free 
 
 48.75 
 
 3.00 
 
 3.00 
 12.50 
 11.25 
 11.25 
 
 11.25 
 
 Stock 
 
 
 
 
 
 
 
 A, 
 
 Paired Objeclives 55 
 
 13.95 
 
 
 
 
 
 -Aj 
 
 13.95 
 
 Slereosiopii < imcra Driintr li 
 
 1 u , «ill, I'lnoMiln 
 
 MlMo M,pi \Mlli 111 tiU- 
 
 112.25 
 
 U9.I9 
 
 llld pl.t. hold' 1 1 >I 1 |> 
 nltlinill uidlllnuil 1(<(S 
 
 -■npiMiil No _47b 
 LMri PJHte Holder foi p 
 Refie(lin(iSt(r(..sn.p. 1 i nbl ii 
 
 /' 
 
 Pair._d Ohj* t tin- \ h > 1 i 
 l>.M).,iilion 
 
 lU ol |jl ill ^ (> \ (.' 11 
 on Ol „ll Stui 1 \ \ 
 
 11 of 6 \ t» cm |il jii 
 
 IIJ i_llll III II n[ tWl 
 
 190 
 \hh 
 < Kul .1 an usM.pf 
 
 1 Ol 11 , on SI ni(i \l' 
 b III! II 1 ot Sli il^hl Duly Free 
 3.5.00 
 
 4. .50 
 V M llii ncgatuesmiiie 
 di iiiHliis hee /' Rok 
 
 published In Julius 
 \\1 1908 j,,> 2h^-2\7 12.00 
 1 OT in ignifit ition < ti see page 322. 
 55 Ao Ai As 
 
 Duly Paid 
 43.40 
 5-58 
 
 14.SS 
 
 PI 
 
 
 
 
 11.25 
 13.95 
 
 322. 
 
 G 
 12.-50 
 
 I. 5.. 50 
 
 
 Stock 
 
 Paired Oculars for Zeiss liinoc 
 Designation 
 
 jlar ^licroscope. Fo 
 
 . , 13. 5 13.95 13.95 
 
 magnification, etc.. seepage 
 3 4 5 
 
 17.05 
 
 7 
 
 Duty Free 
 
 3.00 3 00 
 
 3.00 3.00 3.00 
 3.72 3.72 3.72 
 
 12.50 
 1.1 ..5ft 
 
 Stock 
 
 , , 3.72 3.72 
 
ARTHUR H. THOMAS COMPANY 
 
 MI( ROS( OPE. DISSECTING, MEYER-ZEISS, a huge 
 
 with the great variety of acL't'ssories offered; pail 
 but niij be fitted with simpler magnitiers such 
 combination or with eitlier the monocular or bin 
 XB, XC or XI. 
 
 32512. tUssectinz Stand with adjustable mirror and light modifyini 
 
 round, stage opening 4J inches in diameter bnas di-sc 
 openine, two arm rests, Jiid 1 older httei with nr-k ai 
 
 32S16. DUto, with simple sliding lens holdBr 
 
 3262(1. Cabinet for the stand, of alderwooj 
 
 32524. Round Foot retidiiring the lens 1 oldera a jh f r u e as e 
 
 aectir^g microscope 
 
 Note— The stand of the new di-isect e: " " " " ■" 
 
 binocular microscope \ 1 tl e ]J 
 
 well as a single tube liraiUr to tl 
 
 attachment of two p^tterIJ■■ 
 32528. Yoke with Slide CairiaEe lor eivim_ u 
 
 ahniist uiiiveirial application 
 (■ use witli the Binocular body, 
 . 31024, the Brucke dissecting 
 opes, as on Zi'iss stands XA, 
 
 
 Duly Free 
 
 Duty Pa 
 
 disc to fit the atage 
 
 
 
 g hers and con pos 
 
 
 
 
 21.50 
 
 30.38 
 
 
 17.5(1 
 
 21.70 
 
 ■ u e as eri '<tan ndependentlv o£ tl e d s 
 
 a l-e uie n on un t on w th the boi ol the 
 era the bod of the erect ng n croscope "V 1 as 
 md IX I'or this purpose we supply a yoke 
 
 iL h jt iIj jiil [ ii iipo bod\ with t«o fixing 
 
 32S3e 
 32540 
 32544 
 
 32548, 
 
 325S0. 
 32564. 
 
 325fi8 . 
 
 Yoke without Traver.^ina ^lidi ' n i 
 
 Note— The various Bodies whi'lii^ i I I 
 
 Body of Ihe Binocular Microscojie \h 
 Driiner Stereoscope Camera 
 
 Pillar Bracket for the attathmpot to the \oke of tt 
 Pillar Bracket for the attachment of the bodi of S 
 Body of Ihe Single-tube Erecdni? Microscope XI w 
 Body similar to that of the blngle-tuhp Stand \l 
 Note — The following ports Jre required to rendtr t 
 
 Ball Stage to drop Into the stage opening 
 Raising Block for attachment bet^seen tin- xokt j 
 Drawing Apparalua for uip nith the \U\ ^r Dm t 
 
 e pilUr hrai liet l^ ith tvi o long h\mg acre 
 
ARTHUR H. THOMAS COMPANY 
 
 
 MICROSCOPE, LUMINESCENCE, ZEISS T n u u o J u . I I tand as used for 
 
 other work, with Achromatic or Apochromatic Objectives and either Huyghenian or Corapensating^Ocu- 
 lars, and differs only in the illuminating apparatus and source of light. In order that the illuminating 
 apparatus permit the radiation of the object with ultra-violet light, which causes the luminescence, 
 it is essential that the object slide as well as the condenser system be of quartz, which is permeable 
 for the ultra-violet ray, exactly as is required in the micro-photographic outfit for ultra-violet light. 
 The source of light may be either an arc lamp with specially prepared carbons or a Quartz Mercury 
 Vapor Lamp, both of which are rich in ultra-violet rays. A collector condensing system of quartz 
 lenses is also necessary. Light, particularly of wavelength visible to the eye, must be cut out by means 
 of ultra-violet filters in order that the object may be examined solely in the fluorescent light originating 
 from it under the action of the ultra-violet ray. The Lehmann filter with the additional filters of 
 blue Uviol glass provides this feature. The illustration shows the outfit complete with Zeiss Micro- 
 scope Stand III in position and the hand regulating arc lamp, but with the diaphragm removed to better 
 display the remaining parts. For more detailed description send for a copy of Zeiss Micro 325. The 
 component parts of the equipment with individual prices arc aa follows: 
 
 32572. 
 32576. 
 32580. 
 32584. 
 32588. 
 32592. 
 32596. 
 32600. 
 32604. 
 32608. 
 32612. 
 
 32616. 
 32620. 
 32624. 
 
 ,32628. 
 32632. 
 32636. 
 
 32640. 
 
 32644. 
 
 32648. 
 32652. 
 32656. 
 
 32660. 
 32664. 
 32668. 
 32672. 
 
 32674. 
 
 Duty Free 
 
 Base Board, with optical bench 70 cm long 8.75 
 
 Diaphragm Arrangement 5.00 
 
 Blue Uviol Glass Disc, 6 cm diameter, on support 7.00 
 
 UV Filter, 6 cm diameter, on support 17.00 
 
 Wash Bottle, for filling and emptying the UV Filter .69 
 
 Quartz Condensing Lens, plano-convex, 6 cm in diameter, on support 13.25 
 
 Support for microscope with quartz prism 12. .50 
 
 Quartz Substage Condenser with iris diaphragm 17.50 
 
 Centering Device for above 3.00 
 
 Uranium Glass Plate, with circular ring for centering 2.00 
 
 Plane mirror in mounting, for the convenient observation of the uranium glass 
 
 centering plate .38 
 
 Micro Slide of Quartz, 0.5 mm thick, 25 x 30 mm 1.13 
 
 Cover Glass, of Euphos glass, 0. 17 to 0.20 mm thick, 12 mm in diameter .25 
 
 Object Carrier, Heidenhain, for the convenient manipulation of the quartz 
 
 slides 50 
 
 Hand Regulating Arc Lamp, for 10 amperes 13.50 
 
 Carbons, special, impregnated with nickel, per 50 pairs 1.75 
 
 Quartz Condensing Lens, consisting of two plano-convex lenses of quartz, 4 
 
 cm in diameter, on support 10.75 
 
 Rheostat, for 110 volts, alternating or direct current, for either 5 or 10 
 
 amperes 8.00 
 
 Rheostat, for 220 volts, alternating or direct current, for either 5 or 10 
 
 amperes 10.63 
 
 Note — As an alternative to the Arc Lamp above listed the Quartz Mercury 
 
 Vapor Lamp may be used as a source of light as follows: — 
 
 Quartz Mercury Vapor Lamp 32.50 
 
 Light Box for above 27.50 
 
 Quartz Condensing Lens, similar to above, but consisting of a meniscus and 
 
 plano-convex lens of 4 cm diameter, on support 12.00 
 
 Rheostat for 110 volts direct current 10.00 
 
 Additional Rheostat making above available for 220 volts direct current 6.25 
 
 Extra Quartz Lamp, only, for replacement 11.25 
 
 Microscope, Zeiss Stand IIIDQ as shown in illustration and specially designed 
 
 for this outfit 60.00 
 
 Complete Luminescence Ouffi* with Arc Lamp as above with rheostat for 110 
 
 volts 282.45 
 
 Complete Luminescence Outfit with Arc Lamp as above with rheostat for 220 
 
 volts 285.08 
 
 6.20 
 8.68 
 21.08 
 .85 
 16.43 
 15.50 
 21.70 
 3.72 
 2.48 
 
 .47 
 1.40 
 .31 
 
 .62 
 16.74 
 2.17 
 
 13.33 
 
 9.92 
 
 13.18 
 
 40.30 
 34.10 
 
 14.88 
 12.40 
 7.75 
 13.95 
 
 74.40 
 
 350.23 
 
 353.49 
 
ULTRA-MICROSCOPE. ZEISS CARDIOID CONDENSER TYPE. The Cardioid Microscope as devised by 
 iSiedeutopf is designed for bringing into view ultra-microscopic particles by means of a simplified attach- 
 ment (the cardioid condenser) providing a remarkable light concentrating power. By this arrangement 
 the rays of high aperture are employed to illuminate the object, while those of low aperture reach the 
 eye. The difficulty occasioned by the presence of surface impurities, the maintenance of a stratum of 
 the correct thickness and the absorbing properties of the ultra-microscopic particles have been avoided 
 by the use of a suitably designed chamber. The Cardioid Ultra-Microscope is primarily adapted for 
 the examination of colloid solutions, diluted precipitates and for the observation of micro-chemical 
 and photo-chemical reactions. Where a suitable microscope and source of light are already 
 available it is only necessary to provide the Special Equipment. In the illustration the Cardioid 
 Condenser is shown in position on Zeiss Stand III equippedwith the special apochromatic 3 mm ob- 
 jective with centering appliance, Cardioid Condenser in position on substage and quartz chamber in 
 position in its holder on the stage, with the water cooling cell and arc lamp in position. For more 
 drlaili'd (Icscriplit'ii send for Zeiss Mikro S06. 
 
 Special Cardioid Condenser Equipment, consisting of trough for water cooling without wooden sup- 
 port; Cardioid Condenser; quartz chamber; chamber holder; special apochromatic objectives 
 3 mm, N.A. 0.9; centering applicance for special apochromatic objective; compensating ocular 
 18 with sliding lens system; Huyghenian ocular 1 as searcher ocular, and platina collar with 
 two accessory supports, in case, but without Microscope stand or arc lamp as shown in illus- 
 tration. Duty Free 66.50 Duty Paid 82.46 
 
 Complete Cardioid Ultra -Microscope Outfit, consisting of above Special Equipment and Zeiss Stand 
 IIIAA, .4rc Lamp No. 3284S as shown in illustration, with rheostat for 110 volts and 50 carbons. 
 
 Duty Free 134.76 Duty Paid 168.51 
 
 Complete Cardioid Ultra -Micros cope Outfit, as above, with rheostat for 220 volts. 
 
 Duty Free 136.26 Duty Paid 170.37 
 
 Cardioid Condenser, only. 
 
 Duty Free 10.00 Duty Paid 12.40 
 
 32700— Sli I Ulira-Microscope 
 
 32676. 
 
 32684. 
 32688. 
 
 ULTRA -MICRO SCOPE, ZEISSISLIT TYPE, an improved arringement of the "^ ede t jpt and Zsigmondy appa- 
 ratus originally announced in 1904 and which by the orthogonal arrangement of the direction of illumi- 
 nation and observation and the micrometrically alterable thickness of the illuminating beam in relation 
 to the depth of definition of the objective, entirely removes the powerful absorptive effect of the upper 
 surface of the slide and the lower surface of the cover glass. This arrangement is specially recom- 
 mended for the investigation of all colloidal substances, serum solutions, drinking water, etc. With 
 some additions as listed in separate outfit this arrangement is the only practical one for the investi- 
 gation of ultra-microns inside solid bodies, glasses and crystals. For titore ilptmleil de.irripfion send 
 fur Zeiss Mil.ro 230. Suitable outfits for both liquid colloids and solid colloids are offered as follows: — 
 32700. Complete Slit Type Ultra -Microscope Outfit for Liquid Colloids, consisting of table top with optical 
 bench; objective f = 120 mm in disc-stop on saddle stand; precision slit on saddle stand 
 capable of being rotated by 90°; objective f = 55 mm in disc-stop on saddle stand; sole-plate 
 with cross slide for the optical bench with intermediate-plate; achromatic objective AA for 
 the cross slide; immersion objective D* with trough holder and screw-ring in case, trough with 
 fixed sleeve with conical adapter and hose-clamp; Stand V without mirror, stage or case; 
 Huyghenian ocular 4, cross ruled, with sliding eyelens; Weule's automatically regulating arc 
 lamp for direct current, 5 amperes, with diaphragm for the casing and rheostat for 110 volts. 
 
 Duty Free 172.65 Duty Paid 214.09 
 
 32704. Complete Slit Tj'pe Ultra -Microscope Outfit, as above, with rheostat for 220 volts. 
 
 Duty Free 177.38 Duty Paid 219.95 
 
 32708. Additional Equipment to above for Solid Colloids, consisting of achromatic objective C, polarizer on 
 saddle stand, Analyzer I and Zeiss Microscijpe Stand IV with stage to raise and lower, without 
 Abbe illuminating apparatus, and with case. 
 Duty Free 120.75 Duty Paid 149,73 
 
 329 
 
Zeiss, for the Observa- 
 tion of Liquid Crystals, consist- 
 ing of Stand IV, with large 
 mechanical stage divided in de- 
 grees with index, but without 
 condenser system, diaphragm 
 holder and iris diaphragm ; with 
 gas heating condenser with air 
 cooling apparatus; preparation 
 stage for the large mechanical 
 rotatory and adjustable 
 analyser with selenite film for 
 red of the first order; objectives 
 A and D, each with water cool- 
 ing arrangement; cross line ocu- 
 2 and 4; micrometer ocular 
 H3 and compressed air cylinder. 
 
 Duty Free 221.25 
 
 Duty Paid 274.35 
 
 Microscope. Zeiss, same as above, but 
 with analyzer, to be put on the 
 ocular instead of the rotatory 
 and adjustable analyser. 
 
 Duty Free 207.50 
 
 Duty Paid 257.30 
 
 Microscope, Binocular, Chun, with image erecting prisms, as used for dissecting and observing small 
 ;miiiia[s in trays or on plates of large dimensions. The legs of the stand are jointed and may be 
 extended or brought together to suit the size of the vessel. With paired oculars Nos. 2 and 
 4 and paired objectives of 77 mm and 40 mm focus, giving a range of magnifications from about 
 10 diameters to 50 diameters. 
 Dutyfree 80.50 Duty Paid 115.95 
 
ARTHUR H. THOMAS COMPANY 
 
 MICROSCOPE LAMPS. For all purposes involving the use of a Microscope, i. e., general microscopy, dark- 
 field illumination, micro-photography, projection for drawing, illumination of opaque objects such as 
 metallic surfaces (metallography), etc., the small arc lamp gives the best results, although in the 
 ordinary use of the Microscope the light from the arc must be tempered by the use of ground or blue 
 glass discs as provided. The Nernst lamps are a very convenient and satisfactory source of light for 
 all of thp work above mentioned with the exception of dark-field illumination with high powers, such 
 as I'jtii inch iduncrsion objective for which use the are is much superior. The Welsbach gas lamps 
 givr vrcy jiuinl results, particularly in micro-jjhotography, and are very satisfactory for general work 
 icope. The kerosene lamp, while quite suited for ordinary use with the Microscope 
 
 ""r powers. All of the arc 
 I 111) or 220 volts, atter- 
 A suitable resistance 
 
 'ii'il for use with both the 
 
 , ith curd and plug but without 
 
 14.00 
 
 ck -field illumination with the Zeiss 
 ; examination of colloidal solu- 
 cdl with weak copper sulphate 
 
 32852. 
 
 32856. 
 32860. 
 32864. 
 32868. 
 
 32876. 
 
 32880. 
 
 is not rciuiiiiiifuded for dark-field illumination, partici 
 
 lamps listed below may he used on nrdiiKLry house lishtii ._ ■ ■ . ; i ■ ■ 
 
 nating current or direct current, the divert i.'urreut Ix'in^ 1 1 -i -.i 
 
 is always necessary in using these lamps. The Flask (.'omicn-i r i- m-u 
 Xernst and Welsbach lamps, particularly for dark-field illuminatioii. 
 Micro Lamp, Hand Feed Arc, Bausch & Lomb, on adjustable support, 
 
 rheostat 
 
 Micro Lamp, Hand Feed Arc, Zeiss, specially recoimnendpd for d:i 
 
 Paraboloid Condenser and with the Cardioid * Vmdeiisi'i' for 
 
 tions, etc. To prevent undue heating of the nbjcft i lie usi- nl 
 
 solution or cool distilled water is recommended, Willnmt sil.i 
 
 Duty Free 11.75 Stock 15.98 
 
 Rheostat, fixed form, for 110 volts, 4 amperes; necessary in using either of the above Hand Feed Arc 
 
 Lamp on house circuit 5,00 
 
 Rheostat, as above, for 220 volts, 4 amperes 6.50 
 
 Carbons, for either of above Lamps, 6 inches long, ^ in, diameter. Per 10 40 
 
 " " " " " " " " " \ in. " Per 10 38 
 
 Micro Lamp, Nernst Electric, Bausch & Lomb, on adjustable support with frosted globe; with cord and 
 
 plug, ^'oltage must be specified in ordering. No rheostat necessary 9.00 
 
 Extra Glowers. Voltage must be specified in ordering .35 
 
 Micro Lamp, Nernst Electric, Zeiss, in metal mounting, conveniently inclined for easy direction of the 
 
 beam upon the microscope mirror. The Nernst glower must be warmed when the current is 
 
 first turned on with an alcohol lamp or similar source of heat- Voltage must be specified in 
 
 ordering. No rheostat necessary. 
 
 Duty Free 10.00 Stock 13.60 
 
 Extra Glowers. 1.50 
 
 Glass Cell for use with above lamps, with plane glass sides, 100 x 80 x 8 mm 3.0O 
 
 Micro Lamp, Welsbach Gas, with adjustable support, on base, and with a blackened metal chimney 
 
 and condensing lens 8,00 
 
 Micro Lamp, Welsbach Gas, similar to above but with the addition of an iris diaphragm for controlling 
 
 the size of the emergent pencil of light 12.00 
 
 Micro Lamp, Welsbach Gas, similar to above but without either condensing lens or iris diaphragm- 
 
 ■ '-' ' ■■*" ^'"''^--' ^^- o..r>r>^:„ ..,u: u :.,.... ^j^^ diaphragm nof the 
 
 intended for use with Flask Condenser No. 32900 in which case neithe 
 
 condensing lens is necessary 
 
 Mantles for above Welsbach Lamps, each. 
 
 6.50 
 
ARTHUR H. THOMAS COMPANY 
 
 32900, Flask Condenser, oq wooden stand for filling with distilled water; for use with either the Bausch & 
 Lomb Nernst Lamp or VVelsbach Lamp No. 33S96, particularly in dark-field illumination. . . 2.25 
 
 32904. Flask, only " 75 
 
 32908. Micro Lamp, Incandescent Gas, Zeiss, with inverted mantle and flask condenser. 
 
 Duty Free 5.00 Stock 6.80 
 
 32912, Micro Lamp, Zeiss, fo"- Monochromatic Light, consisting of a mercury vapor arc lamp 20 cm long, spe- 
 cially made for this work, support, screen, and Jena glass flask to act as both condenser and ray 
 filter; particularly valuable in refined microscopic work where it is of advantage to use a beam 
 of light of a given wavelength. By using different solutions in the composition of the ray filter 
 monochromatic light of wavelengths as indicated below are available. 
 
 Filler for yeUow llghl, \ = 579 and 576 u m- Filter for green lighl, X = G46 ^ «. 
 
 Potassium bichromate 15 grams Picric acid 0.4 grams 
 
 Copper sulphate 3.5 grams Copper sulphate 3.5 grama 
 
 Sulphuric acid 15 cc Didyraium nitrate 1.5 grams 
 
 Distilled water,.... 300 cc _ Diatilled water 300 cc 
 
 Note — -The above formula without the Didymium nitrate gives a yellowish green light of wavelength X = 570, X = 576 and 
 X = 516 »i It. 
 
 Filter for blue light X = 436 fi li. 
 
 Copper sulphate 1 gram 
 
 Diatilled water 22.T cc 
 
 Ammonia 75 cc 
 
 Note— This filter ia transparent also to the violet raya of wavelength 107 and i05 ix u. 
 
 Reference — A Kokler Vber die Verwenditng des Quicksilberlickls far inikroskopisclie Arbciten; 
 ZciUrhr. fur wiss. Mikroskopic, XXVII, 1910. 
 32912. Complete Outfit, as above, with support for the lamp and condenser flask and condenser flask of .Jena 
 plass. without resistance. 
 
 Duty Free I6.2.i Stock 25.00 
 
 Duly Free Duly Paid 
 
 3291G. Mercury Vapor Lamp, only, for above 5.50 8.65 
 
 32920. Special Resistance necessary for above lamp, for 110 volts 8.75 10.85 
 
 32924. " " " " " " " 220 volts 11.25 13.95 
 
 32928. Micro Lamp, Electric, with 60 watt incandescent bulb, blue and amber colored screens and one diffus- 
 ing glass also platform for convenient use in warming glides 10.00 
 
 32932. Micro Lamp, Kerosene, on metal foot; with blue moderating glass, shield, etc 7.50 
 

 32948. 
 32952. 
 
 32956. 
 
 32960. 
 
 No. 32944 l\:j- :l.'.i.-,. Nu j jj 
 
 Micro Object Marking Apparatus. This device is muLiiiteJ m a sj letj sciew dn 1 cau be inserted in 
 plaije of the objective or carried on the nosepieee for ut," when occasion demanib -Vfter the 
 field to be marked is found the diamond point is set to engrave a circle around same, the 
 smallest circle possible being } ram. After the circle is made, the field can always be easily lo- 
 cated by the use of a low power objective at first. This apparatus is intended for use only on 
 preparations mounted under a cover glass. 
 Duty Free lO-'iO Stock 14.00 
 
 Micro Object Marking Apparatus, in objective mounting for screwing into nosepieee. This arrange- 
 ment marks by means of a colored ring on the cover glass. The apparatus is filled with color- 
 ing matter and when brought gently in contact with the slide leaves a small ring 4.50 
 
 Microscope Oven. Plehn-Nuttal, for constant temperatures, improved construction, with metal parts 
 of Nickelin, a non-corrodible alloy. With micro burner and metallic thermoregulator, but with- 
 out thermometer or microscope 
 Duty Free 61.05 Duty Paid 81.40 
 
 Micro Warm Stage, Pfeiffer, with three concavities for banging drop, tubulations for inflow and out- 
 flow of water and thermometer graduated from 33° to 44" C. in ^ths 7.50 
 
 Micro Warm Stage, Schultze, consisting of a "U" shaped metal stage to which heat is applied by means 
 of an alcohol lamp or small burner. The stage is fitted with a condenser which renders it avail- 
 able for observations under a high power, and has a thermometer reading to 100° C 12.00 
 
 Micro Warm Stage, Strieker, consisting of a flat metal chamber through which a constant stream of 
 warm water may be passed; with a lens a,t the center making it available for use with high powers. 
 A thermometer is provided with bulb within the chamber and scale on the outside of stage. 14.00 
 
 Ocular, Double Demonstrating, for use with two observers, with pointer in the common field of view, 
 with power of 6 X. 
 Duty Free 17.60 Duty Paid 22.00 
 
I-CORROSIVE 
 
 o o 
 
 No. 33012 
 
 e 
 
 
 32980. 
 32984. 
 
 .12996. 
 33000. 
 
 33002. 
 33004. 
 
 .33012. 
 33016. 
 
 Thitkness 
 
 —varying from 0.1 
 
 NDN'C0RR3SI\ 
 
 (1/100 
 
 No. 32992— Size 
 Number of (over Glass in * Oz 
 iz. box of No. 1, IR mm square contains I: 
 .z. bo« of No.2, 22 n ' ' 
 
 .z. box of No. 1.22» 
 
 tangles contains 156 covers. 
 
 form in color and smoothly cut. Carefully 
 in ordering. 
 
 Micro Cover Glasses, Standard White, Blue Label, 
 
 packed in | oz. round cardboard boxes. Please specify size, shape and tliicki 
 
 iSize, mm, squares or circles 1 2 15 18_ 
 
 Per^oz.boxNo. 1 38 .38 -38 
 
 No.2.. 
 
 No. 3 25 
 
 .30 
 
 .25 
 
 Micro Cover Glasses, "Non-Corrosive," Red Label, guaranteed against corrosion in any climate. Glass 
 is .(f slightly greenisli tint. Neatly packed in i oz. round wooden boxes. A specialty of our own 
 introibution in very wide use. Please specify size, shape and thickness in ordering. 
 Size, rncii. squares or circles 12 15 18 22 25 
 
 . squares 
 
 . box No. 1 45 
 
 " No. 2 35 
 
 icro Cover Glasses, "Non-Corrosive," Red Label, rectangular 
 
 Per 
 
 ix30 
 
 ^3 of 5 O 
 
 22 .X 32 
 58 
 
 22 X 36 
 50 
 
 22x40 
 48 
 38 
 
 .45 .45 
 
 .35 .35 
 
 Most used sizes. 
 
 50 24 X 30 
 
 3S 
 
 6(3 
 51 
 
 Per ^ oz. box of No. 1. . 
 " " " " No.2.. 
 
 Hizo, mm 
 
 .\r'pnJX. eonteDts of J oz. box 
 
 .50 
 
 35 X 50 
 
 Per ' oz 
 
 box of No. 1 
 
 No.2 
 
 .75 
 .50 
 
 .75 
 .50 
 
 16 
 .75 
 .50 
 
 43x50 
 16 
 
 .75 
 .50 
 
 43x70 
 14 
 
 12 
 
 .75 
 .50 
 
 Ij mm; 
 
 Micro Slides, Standard White. Blue Label, witli carefully ground edges, average thickness 1 
 carefully packed witli p;ii)cr between each slide, in h gross cardboard boxes. 
 
 Size, inches 2x1 -i x 1 3 x U 3x2 
 
 Per ^ gross box 45 -45 .75 1.10 
 
 Micro Slides, same as above, 3x1 inches, but J to 1{ mm thick. Per j gross box 40 
 
 " " " " " 3x1 " " " " " " " and polished on both sides, of spe- 
 ciallv selected stock. Per I gross box 1.10 
 
 Micro Slides, same as above, i.e. f to li mm thick, 1 1- \ 1 inch, for petrographers. Per \ gross box .40 
 
 Micro Slides, "Non-Corrosive," Red Label, with well ground edges. The limits of thickness are 
 usually from j to IJ mm but the slides in any one box are usually of the same thickness. A 
 specialty of our own in wide use. This slide is of a slightly greenish tint and is guaranteed not 
 
 to corrode or become cloudy in any climate. Size, inches 3_x 1 ^^U _ 3x2 
 
 Per i gross box 45 1.00 1.25 
 
 Micro Slides, same as above but carefully selected to be between U and 2 mm thick, and as free from 
 striae and scratches as possible as required in the U. S. Bureau of Plant Industry. In 3 x 1 
 inch size only. Per -J- gross box .50 
 
 Micro Slides, for Brain Sections, with fiircfulh- ground edges and about 2 mm thick. 
 
 Size, mm 80x110 100 x 150 U5 x 150 160 x 100 
 
 Per 100 6-00 8.00 " 9.00 15.00 
 
 Micro Covers for Brain Sections, of glass varying from .5 to .7mm thick. 
 
 Size, mm.... 40x55 40x00 45x70 65x100 65 x110 75 x125 90x140 90x175 105x140 125x145 
 Per 100 "l.lO LSO 1.60 3.25" 3.60 4.70 6.30 7.85 " 7.35 '9.10 
 
 Micro Covers of Mica, for Brain Sections, carefully selected to be as free as possible from striae, etc. 
 
 Size, mm 40x.55 40x00 45x70 65 x 10 65 x 110 75 x 12 5 90 x 140 90x175 105x140 125x145 
 
 Per 100 "1.80 4.80 3.60 12.00 13.20 21.00 27.00 36.00 36.00 54.00 " 
 
 Culture Slide, 3x1 inches, with polished spherical concavity 12 mm in diameter; as used for hanging 
 drop and similar reactions. Each 05 
 
 Culture Slide, same as No. 33008 but with two concavities. Each 08 
 
 " " 3x1 inches, of heavy polished plate glass with flat bottom, depression 3 mm deep and 
 16 mm in diameter. Inside of bottom is smooth, but not polished. For drop cultures, etc. 
 Each 20 
 
ARTHUR H, THOMAS COMPANY 
 
 33024. 
 
 33028. 
 
 3303(). 
 33040. 
 33044. 
 
 33048. 
 33052. 
 
 3305(5. 
 33060. 
 
 Culture Slide, consisting of heavy polished plate glass slide with cell, 15 mtn in diameter, 3 mm deep, 
 fused on in electric furnace. The advantage of this slide is that the bottom of the cell 
 consists of the plate gla'^s slide free from inequalities 35 
 
 , etc., with side tubes and cover 
 5 finch' ground, for cementing on i 
 
 i,f . 
 
 i to mal 
 
 .15 
 
 1.00 
 
 10 
 
 Culture Slides, for cultures, clcctroly 
 Glass Rings for Micro Slides, with cdfii 
 
 Diameter, mm 
 
 Height, mm 
 
 Each 
 
 Glass Cells for Micro Slides, con.sijjting of ;i scji 
 
 Diameter of hole, nmi 10 HI ]o 
 
 Thickness of glass, mm 1 2 1 
 
 Each ~.15 .15 .15 
 
 Micro Labels, for sliiles, with burder, 22 nun .square Per box of 100 
 
 Per carton of 10 boxi , 
 
 " " " " " " rectangular, 22 x 1.5 mm. Per box of 100 10 
 
 Per carton of 10 boxes 75 
 
 " " " " in book-5 of 500 Ubch each These labels are printeii on best white gummed 
 paper and are scored as to be ieidd\ torn fiom the book, leaving clean edges, interleaved with 
 paraffine paper. Size 22 mm squ ii r Per book 25 
 
 10 
 
 Micro Labels, for slides, same 
 
 Micro Slide Box, for con\enientl i i 
 
 attaching on wall. Foi i I i n li 
 Micro Slide Mailing Cases foi ^h I In 
 
 Boxes, of white wood popul irlj 1 
 
 Each 
 
 ctangular. Size 22 x 15 mm. Per book _„ 
 
 I ^l^des to be withdrawn one bv one as needed. For 
 
 1.00 
 
 Per dozen 10 
 
 ,\n as Pillsbury boxes, for twetu v-fi\c Z\ 1 slides 
 
 Per 100 6.00 
 
 '■ Slide Boxes, improved form, of selected wood, with lid fitting down "wr the outside of pro- 
 jection instead of inside as in No. 33000, Box is joined by superior method of gluing and is dis- 
 tinctly worth the difference in piice. 
 
 Number 1024 1030 1932 1934 
 
 Size of slides 3x1 1^x1 3x2 3x1 
 
 Capacity 12 25 25 25 
 
 Per 10 l5~ 1T25 2.00 IM 
 
 Micro Slide Box, for one hundrei! 3 x 1 slides, of wood covered with green book-bimler's cloth, with 
 hinged lid , 40 
 
ARTHUR H. THOMAS COMPANY 
 
 iH) Micro Slide Cabinet. Bau*,ch i. Lomb. mi 
 
 index. For 3x1 sliilrs. 
 
 Number 
 
 Capacity, slides 
 
 Each 
 
 II, t i. t iLid.liOg,m\ , « itli Ji^\M:,i HI bottom for card 
 
 2016 2020 2025 
 
 _500 1500 _ 3000 
 
 12.00 25.00 50.00 
 
 3307(i. Micro Slide Trays of cardboard, in map form, holding twenty 3x1 slides 25 
 
 3.30.S0. Micro Slide Cabinet, Minot, of metal. The 30 trays each hold twcntv-four 3 x 1 slides giving a total 
 
 capacity of 720 slides 20.00 
 
 View in .Stock Iti 
 
 Office View ShowinR Section for Dislrihution of Calalagues 
 
ARTHUR H. THOMAS COMPANY 
 
 MICRO-PHOTOGRAPHIC APPARATUS, BAUSCH AND LOMB, MODEL G. for Horizontal and Vertical Work, 
 with and without Microscope. Designed especially for general laboratory and research work in 
 college, commercial institution or wherever photomicrographic work of the highest grade is desired. 
 The new models presented here are the outgrowth of many years experience in developing and 
 constructing apparatus of this general type with a view of obtaining the greatest possible stability and 
 efficiency. Not only will this apparatus accommodate a wide range of magnifications, producing 
 photomicrographs up to 8 x 10 inches in size, but it can also be used to advantage in photographing 
 gross objects, in enlarging and reducing work and is thus an excellent laboratory camera. Its dis- 
 tinctive features are: 
 
 Extreme rigidit;. 
 
 Constantly accurate alignment of parts, due to construction on single supporlint! stand with accurately planed optica 
 free from spring and vibration- 
 Superior illuminating system- 
 Convenient and efTeclive adjuslraent.i. 
 Swing-out of microscope plate, permitting direct abserva 
 Long range vertical adjustment of microscope plate, per 
 Special camera box. providing for focusing on opaque screen in 
 Removable plate holder adapter, permitting long side of plate ti 
 Wide scope of adjustability and usefulness 
 
 Supporting Stand — Of east iron maaaue fonstructioa having base of four feet cast in one piece with heavy connecting rib. 
 base baa spread of 54 x 24 m and is fitted with both castors and leveling screws; two upright supports carry main optical 
 bed at height of 42 in., nooden shelf for accessories measuring 37 i 18 in- is mounted between upright aupporta. 
 
 Optical Beds — Three in number of lathe t\pe carefulK planed and accommodating supports for the different parts, -which 
 may be adjusted as desired and ntidh ImiLel niun ied, 78 in- (198.5 cm) long and 4) in. 111.8 cm) wide, carries two sup- 
 plementary beds — one adJUSl^ble cjrr i i J one stationary, bearing illuminating apparatus; adjustable bed 49 
 
 of object lo be photographed through eyepiece. 
 ing use of any standard microscope. 
 I in olace of ground glass if desired- 
 
 d in either vertical or horizontal positior 
 
 in. (124 cm] long and 41 ii 
 aolutely rigid by its supportiug I rj 
 every fifth centimeter numbered t 
 desired point or removed nithout Jill 
 Illtiminant — Two different electric illuminai 
 feeding device for adjusting 'rom ri 
 
 t it any position from the horizontal to the vertical and rendered ab- 
 
 r I adjustable beds graduated io centimeters and millimeters, with 
 
 inted on heavy casting which may be clamped to main bed at any 
 
 ,guUrly listed with outfit— 90 arc lamp, orovided with long extension 
 _ _. __ ... _ -a bolt or aiiigle-glower Nernst lamp for 110 or 220 volts; both lamps mounted 
 
 either in large fight-tight lamp house with observation windows and spring door or in smaller lamp house without door; 
 both lamp houses, when furnished with arc lamp, provided with, small mirror mounted near one of observation windows 
 to serve aa guide in feeding lamp from rear of camera box; 5-ampere, UO volt rheostat mounted on base of stand, when arc 
 lamp is furnished- 
 Condensing System — Apparatus is listed with two different condensing systems— complete and simple; comolete consists of 
 regular triple system, 4i inch diameter, in Bauach & Lomb patent ventilated mount with water cell, bellows and standards 
 mounted on stationary optical bed, front standard of bellows has special mounting carrying a 2i inch diameter, 12 inch 
 focua piano convex condensing lens for use with front lens of triple system removed, an iris diaphragm with 2i inch 
 opening and a trough for carrying yellow glass ray filter or cell for Uquid filter, both o£ which are furnished with outfit; 
 sirnple system consists only of this front standard with plano-convex lens, iris diaphragm and ray filters as described. 
 Camera — Consists of supports carr.ving tapering bellows with draw of approximately 40 in. having wire support in center; rear 
 support carries box of neatly finished hard wood witb door in side for use in focusing image on opaque white screen if de- 
 sired; supplied with reversible adapter carrying laboratory plate holder for 8x10 plates and kits for smaller sizes, also with 
 two focusing screens — one ground glass with clear center and one clear glass with graduated croas lines ia tjenter; hinged 
 cover with two springs at rear of ad^ter permits plate holder to be placed in exact position without jarring apparatus; plate 
 holder of special book form construction, ensuring exact registration. 
 Shutter— Bauach & Lomb automatic shutter, No- 4570, with ateel leaves, having a maximum opening of 40 mm; may be aet for 
 
 instantaneous, bulb or time exposure; supplied with tube for making hght-tight connection with microscope eyepiece. 
 Microscope Plate— Of metal, 75 X 5i in., provided vrith three leveling screws to serve in bringing any microscope into ei aet 
 alignment with optical axis of camera; fitted to main optical bed by clamping block and provided with vertical screw 
 of 9 inch range, operated by hand wheel, for accommodation of varying center distances on different microscooes; so con- 
 structed that plate may be turned out 90° for locating field to be photographed by direct observation, and provitied with 
 a stop which brings it at once int« alignment with optical axis of camera when turned back; support attached to plate car- 
 ries universal joint and pulley with extension rod, by means of which fine adjustment of microscope, whether level, prism 
 or side adjustment, can be controlled from rear of camera box. 
 PHces on following page. 
 
 337 
 
33088. 
 3309-'. 
 33090. 
 33100. 
 
 33104. 
 
 .331 OS. 
 33112. 
 
 ilh Mkr 
 
 Large Micro-Photot;raphif \.pp;i 
 
 beds, are hinip w ii li i i 
 complete fomlriiNin- ■,- ■ 
 camera ami 
 
 No. :!:I0.11 Arraiiiicd for Murrn-l'hnloj;raph> 
 umI, coiupleU; with adjustable and stationary 
 ifiht lamp house, 5 ampere, 110 volt rheostat, 
 i)ie plate with adjusting rod for microscope, 
 300.00 
 
 Large Micro-Photographic Apparatus. Same as Xo. 330S4 but with Single-Glower Nernst lamp in place 
 
 nfnrr, rii.ust:tt :uid adjusting rod ^ ^ 287.50 
 
 Large Micro-Photographic Apparatus. Same as No. 33084 but with small lamp house and simple con- 
 
 driisin^s\>le>iii ill |)l:ici-i,f rnmplcti- . , . 280.00 
 
 Large Micro-Photographic Apparatus. Sanio as Xo. >ionii'_' bul v\ii h Siiis:h'-( Unwri' Xcin-^i liini|"> in place 
 
 of :irc, rlirnsTat ;in<l :uliustin<: nid .... . . 267.50 
 
 Automatic Arc Lamp, will be furnishrd with an\ nl' llir above niitiils, in |>birr of tlii> hand-feed arc 
 
 ami .■idjusfiTisi rod, at an udditiurial rnsi nf 57.50 
 
 Regular Double Plate Holder for S \ LU plates. ^\ilh«iiil redurinti kits 2.00 
 
 Regular Double Plate Holder. Same as Xu. :;:";ill4, wilh rediieing kits 4.00 
 
 Special Single Laboratory Plate Holder, bookform, for 8 x 1(J plates, with reducing kits 5.50 
 
 Note.^Special descriptive pamphlet sent on application. Bceauae of the many poaaible combinations and arrangements of this 
 
 outfit we sneap.''t the sending of information as to requirements ro that we may submit detailed estimate on specific outfit. 
 
 Micro-Photographic Camera. 
 Bausch and Lomb, Model 
 
 H. The Camera is the 
 riame as furnished with 
 the combined apparatus 
 and is mounted on :i 
 similar optical lied, 
 graduated to 640 mm. 
 The bed is mounted by 
 a strong hinge joint on 
 a heavy metal basi*. 
 13x9£- in.; may Ik- ad- 
 justed in any ijosition 
 between the vertical and 
 horizontal and secured 
 by a clamp. The adj iist - 
 ments on the plate will 
 accommodate any stand- 
 ard microscope. T }i e 
 outfit does not include an 
 illuminating apparatus 
 or shutter 4.1.00 
 
 Micro-photographic Camera, Bausch & Lomb Model K, a simplified outfit for quick operation. The 
 jil ill liiildi T wdl take S\ x 4j inch plates. The camera may be rotated in and out of the axis 
 III tin rriii niv( npi as shown in illustration and the base may be utilized on the work table as 
 I j( ^.iil 1] Mipi'iirt for the microscope at all times so that the vertical rod and camera need only 
 I" id<Kd will 1. photographs are to be made 20.00 
 
 AutomatK Shutter, \Mtli maximum opening of 40 mm, for use with instantaneous, bulb or time ex- 
 iio--iiif ind ji id\ to attach to either Model 11 or Model K cameras as listed above 10.00 
 
iv'ilh special stace hat 
 
 COMBINED DRAWING. MICRO-PHOTOGRAPHIC AND PROJECTION APPARATUS, BAUSCH AND LOMB, 
 
 for use with any regular microscope ixs used for ordinary work and providing for the following: — 
 Drawing with apparatus in horizontal position. 
 Drawing with apparatus in rertical position. 
 Photo -micrography with camera horizontal. 
 Photo-micrography with camera vertical. 
 Gross photography with Micro-Teagar objet 
 Gross photography of solid objects with regi 
 Microscopic projection. 
 Lantern slide projection. 
 
 Drawing of large opaque objects by addition of opaque attachment. 
 Photo -micrography of opaque objerU by addition of vertical illuminator. 
 
 Supporting Stand— Of cast iron, provided with both castors and leveling screws. 
 
 Optical Beds — Two in QiJinber, of lathe type, acoummo dating aupporta for different parts which may be adjusted as desired and 
 rigidly clamped; one bed, graduated to 570 mm, carries illuminating accesaories, microacope plate, and mirror, the other, 
 graduated to 640 mm, carries camera; both are attached to base plate by atrong hinge joints, permitting them tobeadjuated 
 in either horizontal or vertical position. , , , ... ,. . . 
 
 Uliuninant— Either a hand-fed arc or single-glower Nernat electric lamp, as ordered, for uae on du'ect or alternaUng current, en- 
 closed in a small cyhndrical hood with observation windows, attached to rear of condensing sj'stem mount; a rheostat ia 
 mounted on lower base of outfita equipped with the arc lamp, ■■ , .■ i. ■ 
 
 Condensing System— Regular ih in. di;im. triple condensing aystem m patent ventilated mount, which in turn la mounted 
 in a cylindrical shaped metal hood, in which the condensers may be eaaily adjuated to and fro with reference to the lamp; 
 a conical shaped extension slips on the front of the cylindrical shaped hood and helps to render the apparatus more nearly 
 light-tight; diaphragms of three different apertures are furnished to cut off superfluous light and heat when desired; en- 
 tire illuminating apparatus is carried by a special fork and standard, adjuatable for height and also to and fro oa the 
 optical bed, and provided nith coarse and fine adjustment acrewa for shifting its direction vertically or laterally. 
 
 Camera— Regularly suppUed with camera for 4 X 5 in. plates, having a maximu- '-- '- 
 
 plate holder with reducing kits for 3i x 4} m. platea aad a ground gl as 
 
 mounting on two supports clamped to optical bed; front standard faf 
 
 ■ ■ ■' .__ ^. ..1.^ = „ 1 :.^ plates can be supplied ai^ „ — .,.^. — ,„. 
 
 n opening of 40 mm ; may be set for inatantaneous, bulb or time exposure 
 luare, adjustable on front standard of supporting stand, which ia gradu 
 V particular position; supplied with velvet hood on adjustable atandard ti 
 
 33132. 
 33136. 
 
 I beilowa draw of 24 in., equipped with a double 
 
 , ^ ,, ,„. , „ „ — 3 foouaing screen with clear center; in adjustable 
 
 iupRorta clamped to optical bed; front standard fitted with sliding light-tight tube to connect with □ ' 
 croscope- A similar camera to take 5x7 
 Shutter— Automatic with ateel leaves, having a n 
 Drawing Board— Of wood, neatly finished, 14 i 
 ated so that one can readily reset board a 
 shield board from light. 
 Combined Drawing and Micro -photo graphic Apparatus, as described, with hand-feed arc lamp and 
 
 5 ampere rheostat for 110 volts without microscope 155.00 
 
 Combined Drawing and Micro-photographic Apparatus, but with 5 ampere rheostat for 220 volts. 157.50 
 
 Combined Drawing and Micro -photographic Apparatus, but with sinele-glower Nernst lamp in place of 
 
 arc. Please to specify voltage when ordering 150.00 
 
ARTHLiR H. THOMAS COMPANY 
 
 MICRO-PHOTOGRAPHIC APPARATUS, ZEISS. We list below two typical micro-photographio outfits, one 
 i>ii the has?is of llir Zi'iss Ciiii]l)iiii'il Horizontal and Vertical C'amera with Nernst light and one on the 
 Iklsis f.f The Large ^[icrn-plintoi;rLi|jhie Camera with Mercury Vapor Lamp. I'^quipment for micro- 
 
 phoiiigra[)liy shoulil }•<■ ^tArrinl iti every ease with special referenre tn liir ^..m i c- n'l !<:].: a v ^^ilalile and 
 the kind of woiK t n he ari.ninpl i>hed and we recommend that we lie |ni-niii i ■ .1 i .i ; i . i.i . |-.. .|Uiit;ition 
 
 \vli(rev(.T |iossil>lr. Znss Mihru-m^, a 50 pp. catalogue devoted eMl.i-- ■. ■ i ■ i -|.l .i:r!i|>iiH' 
 
 fi|uipnient, will \"- seut vqioii request. Modern research has sliown \.\i:\.\. Ilir l:Li;;r .-niinji.- uf linht of 
 fireat rurri'iil eonsumption are unnecessary if a proper condensing system be used, and where electric 
 r-uiiMii is a\;nlablG we recommend for alternating current the Nernst lamp with iris diaphragm and 
 wherr diriri i iiirent is available the Weule are lamp requiring onlv 5 amperes of current as compared 
 
 wilh Ihe _'ll and ;;n .i,,].. !■.■ I'll ,-,- r ■,l^ IV,.,!, ,„■ the new Meivui'x Vapor Lani]/;,s shown \n lower 
 
 lllll^lrallo]|, Tlii- I .,-1 . , . .■, . .iinarilx uinfonii and I ,n-iit ii-lil . n liirl, with the aid of 
 
 simple li'-dil Illlo, -,,.,.. : I ■ ,..,. „ ■, , . ■n.ix.iN perre<.t<lor,nT, The Zei.> ^\^■ule arc lamp with 
 
 rheoslat ami roiidn, ■ i ,,;: \, n- i- a|,,,li, aUr h, , all, or of I hr out lits I isted beloH al Uie fullowinR prices:— 
 
 33140. Wrui-I Oircn <'orrciU Arc [ unip, •", .ir^i.i, ,-, ,n,iIi cusin^i. 
 
 Duty ^'ri-(- 50.00 Duly Paid , eii.OO 
 
 33144. Cnndcnsing Li-ns IC, ,>r, -;i,|'ll--M .,1 vmiIi in- ilL:i|)liracm 
 
 Duly Free , . 15.00 Duly Paid 19.80 
 
 3.'il4S. .\djuslabte Kcsi.-lance ti.r Hit volts ilircct current. 
 
 Duty Fri-c i.i,5 Duly Paid ... K.14 
 
 Micro-pholographic Outfit, Zeiss, on basis of Combined Horizontal and Vertical Camera (illii.stration shows Cam- 
 era m hoii/oiil d position) Without ]\Iicios(<i|i' oi ((]uipni<nt foi sime 
 
 33156. Combined Hanwnlal and Vertical < dmira 1.>e i>I rli^ , In 45.00 59,40 
 
 331fi0. Two seta of kils t >r Ma illn i I iIl 1.50 1,98 
 
 33164, FocuQsmp Glass 5.00 6.60 
 
 ,33168. Itemole PocusKine < c ar I r ,il , liini il ii, /i l M ui Unuli 1 i i la, , iju I ir i it 14.50 19.14 
 
 33172. Optical Bench 5.00 6.60 
 
 33176. Nernst Lamp I ' I mUi \pljnjtR Coideuscr iial in lL,|lir,_„ 26.25 34.65 
 
 33180. Rheostat t r I I it ilternating or direct curri m 2.50 3.30 
 
 33184. Ray Filter I , li lamp with glass cell 2.50 3.30 
 
 33188. Complete Oiii 102.25 134.97 
 
 Micro-Photographic Ou(fi( /' i m li i i ii I ii_i Cimei i with Mi 1 1 ui \ \ 1)101 I imji foi diicel current onlv 
 
 Without MiLiosi 111 I I M| I , I I I ijiie 
 
 33132. Large Camera uitli , i i i i ill inGring For pbti •- In \ I ' im li s 77.50 102.30 
 
 33196. Three sets of kits lor 2.r> 2.97 
 
 3320O. Focussing Leni G.50 H.liS 
 
 33204. Projection TabU »n}i i m ill < a, li uniaiil I i>n ricid ca at iron stand 25.00 33.00 
 
 33205. ICIevatint! buppiirl I rlh imrr :u\i Hlni.iti tu In used in upright poaitLiiu 13.00 17.16 
 33212. ReflectinK Prism \iitli In i I ir itt i. In, a ii( i > llir ramerT n hen Micro to[ i i t I a I in urticTl position 5.00 6.60 
 33216. Remote Focuxsi 11), I . ir 12.75 Ifi.MS 
 33220. Mercury Vapnr ')ii irl/ I imp i a 4 i i i t lir ( urn m 32.,'iO 42.90 
 33224. Light proof lamp • i im. I . a i III i m I r . I llni a iima^ . m i uli li la nltn- 
 
 \iiil.( I h li II 27.50 36..30 
 
 33228. Rheostat trjr in li 6.25 8.25 
 
 33232. Condenser III III ilK -.iwn diii 7.50 9.90 
 
 33236. Iri.s Diaphratm i i I 7.50 9.90 
 
 33240. Ray Filter i i I ll Inncclh 6.00 7.92 
 
 33244. Complete Oi.n 229.25 302.61 
 
 34o: 
 
(-PHOTOGRAPHIC OUTFIT FOR ULTRA-VIOLET LIGHT, ZEISS. The special effects obt^iinable 
 by the application of ultra-violet light to micro-photography are mainly as follou-s: — 
 Resolving power. In a microscope objective this increases in direct proportion to any decrease in the 
 wavelength of the light used. With the quartz objective in this arrangement the resolving 
 power is about doubled as compared witli an objective of identical numerical aperture when 
 made of glass and operated with daylight. 
 Permeability. Many colored organic objects, both in the fresh and preserved state, display consid- 
 erable variation in their degree of permeabiiitj' under ultra-violet light when they show no sign 
 of color in white light. 
 Physiological effects. These are sometimes very pronounced upo]i '^xinL^ 'irM,,':! ■ rJucris. 
 
 The objectives employed are the monochromats of quartz, ■-.. i . .; ,, ■ ]iL£th 275^^1 and 
 
 with a numerical aperture of the high power 1.25. The entire u|iiir,.l -.■.-iiin iij. In. Iiii^j slides, cover 
 glasses, etc., must be of fused quartz or of glass permeable to the ulua-Muki r.iv. The monochromatic 
 objectives of quartz cannot be used with light of a different wavelength, such as daylight, nor can 
 they be used with an immersion fluid differing in composition or having a refractive index other than 
 that as supplied with each objective. The outfit consists essentially of a Cadmium arc as a source 
 of light which is actuated by the secondary circuit from an induction coil. The beam of wavelength 
 275 fi/x from this sort of light is made available by quartz prisms and this beam, after passing through 
 a quartz condenser lens, is used as a source of illumination for the microscope. As the ultra-violet 
 of this wavelength is totally invisible to the eye, fluorescence screens must be used in order to find 
 suitable field, etc. A list (Zeiss Mikro 237) of the complete literature referring to the use of this in- 
 teresting method, and also Mikro 170 giving more detailed information as to the outfit is sent upon 
 request. The outfit listed below is the latest arrangement offered by the firm of Carl Zeiss. 
 
 33348. 
 333.52. 
 3335e. 
 33360. 
 3336i. 
 3336S. 
 33372. 
 
 Cast Iron Base Plate nith "Ik 
 Verlita! Camera 
 Adapter, with timp shutter 
 2 Sheets for 9 \ 12 cm pUtea 
 Dark Slide, for t« o 9 \ 12 cm 
 Searcher, nith nuartz objeetii 
 Carrier for tfie Searcher \ntli 
 
 let for the micro'icope 
 
 Duly Free 
 
 itito the reEi3ter of the c. 
 nifier for direct obaervatn 
 t on the rod of the i 
 
 33392. Achromatic Objtclive \ 
 
 333911. Quartz Eyepieces t T 11) U viii 20 
 
 33400. Huyghenian Eyepiece 2 
 
 334D4. Sliding Ohjechve Changer for ihc thriP Monoc 
 
 33408. Mahogany Case uith lor k and ki\ lor ti objet 
 
 (Outfit conlinued on Tollowing page t 
 
334ie. 
 33120, 
 
 33432. 
 33438. 
 33440. 
 33444. 
 
 33448. 
 33452. 
 3345S. 
 33460. 
 334G4. 
 
 33480. 
 33484. 
 33488. 
 33492. 
 33496. 
 33500. 
 33504. 
 33508. 
 33512. 
 33516. 
 33520. 
 33524. 
 33528. 
 33S32. 
 
 33536, 
 
 33544, 
 33548. 
 33552. 
 .33556. 
 33560. 
 
 -Photographu Outfit for Ultra- Violet Li^ht, Zeifis Kontmiiecii 
 
 Quarlz ( ondenacr mtli iri^ ,li ipliruiu md with a smglu IrODt iiid 3 duplev front mten hj.iigi Dufv Free Duly Paid 
 
 ,\.\. IT ,l\ 23.10 
 
 Centering \pplianct Inr lh= gijirtz CDndeaaer or for objects ea whicli are to be used aa con 
 
 deimri 5 00 3,96 
 
 Screen il llranium C la-s to in i rt uiin Ihp di iphragiu r irncr of the Abbe lUummating app i 
 
 ntiia "itli n.l I ir ' 2 00 2.64 
 
 Reclangulftr Plant Minor i I i' i i ; i nfind « .49 
 
 4 Object Slides of quarl/ il i i i n . nim tliii L sue 2d i 30 mm 
 
 e-uh 4 50 5.58 
 
 10 Object Slides of U ^ ' I 1 n , , ,1 , n^^Omrn 5 00 6.20 
 
 5 Aluminum Midta l II 1. 1 nhain 2 dO 3.10 
 5 Cover Classes of fus^d m in 3 T5 4.65 
 Stage Micrometer 1 min I i i i irti on quirtz 'lide under a co\er gliaa of fused 
 
 i|uartz nithotiK Hi ili l ii i nun slide 5 00 6.20 
 
 Stand III E ^Mtli larE i, i i i ,_ 1 W N A. 11 21 113.15 
 
 Horse shoe cast iron Base I Ute 2 50 3.10 
 
 Short Optical Bench nith three let ^re»s and column for the co Ike tor 5 00 6.60 
 
 Spark Stand for horiaontal eLrtrodes 20 00 26.40 
 Projection Lens Carrier mth ili Je fur flip • ullini itor on saddle stand without micrometrical 
 
 moieiii II 3 aO 4.62 
 
 Collimator of mii n i ' b 25 8.25 
 
 Prism Platform i i I i [i it on saddle atand 575 7.59 
 
 2 Prisms of quarl hi I i surface about 3 cm high and 5 cm wide 
 
 inrhrii M i i il i I i i r I 25 00 33.00 
 
 10 mptprs Cadmium Wirt 2 50 3.30 
 
 10 mettri Magnetium Tape 75 .99 
 
 Induction Coil Sen. i HB without (ondenaer 45 00 59.40 
 
 Eleclrolvte Tontact Breaker Simon with pore pUin nozzle 1125 14.85 
 
 Resistance Coil 12 00 15.84 
 
 Amperemeter T\ pe \( fur 1 to 5 amperes aperiodic 9 98 13.17 
 
 Switch lor cut off I 75 2.31 
 
 Fluorescent Screen 3 t H cm 38 .50 
 
 Condenser Loniisting ol two Le\ dpii jars 11 25 14.85 
 
 Burner h 25 8.25 
 
 Table top and case for the illuminating appiratui 12 50 16.50 
 
 Switch board 35 00 46.20 
 
 Wire and montage 12 50 16.50 
 
 Support Irir thL ' aiiitr i 4 25 5.61 
 
 Complete Micro-photographic Outfit for Ultra-violet Light, as above listed. 785.73 1037.15 
 
 ACCESSORIES FOR USE WITH MICRO -PHOTO GRAPHIC OUTFITS. 
 
 Micro-Tessar Objective, Bausch & Lomb, Zei.'Es. constructed after the formulae of the large photo- 
 graphic lenses of the same name and particularly well adapted to photo-micrography. The 
 angle of view is 55**, the illumination is uniform and the definition remarkably sharp. Each 
 is mounted with a metal iris diaphragm and provided with a society screw. 72 mm equivalent 
 
 focus 32.00 
 
 Micro Tessar Objective. Same as above, but with 48 mm equivalent focus 26.00 
 
 Micro Tessar Objective. Same as above, but with 32 mm equivalent focus. 26.00 
 
 Doublet Focusing Glass 4.00 
 
 Achromatic Focusing Glass, 8.00 
 
 Light Filters, Wratten and Wainwright, Set of 9, etc., for micro-photography, cemented between glass, 2 
 inches square. 
 Duly Free . . S.IO Duty Paid IMO 
 
 View in Salesroom Showing Microscopes, and Accessories, Apparatus for Cement and Asphalt Testing, etc. 
 
ARTHUR H. THOMAS COMPANY 
 
 N»- 33624 No. 33636 
 
 MICROTOME, STUDENT. BAUSCH AND LOME, suitable for individual and elementary laboratory use. 
 
 Feedinu Mechanism— Oporated by liand; consists of aecuratelv cut miiTO meter screw of 0,,i mm pitch, provided with a disc 
 
 graduated iuto 100 parts each equal to a microns, the edge having 100 teeth which engage with a click and secure perfect 
 
 control of the feed; whole supported in a metal stirrup, permanently attached to front of stand. 
 Object Clamp— Of one piece, extremely rigid; when fully extended will accommodate objects measuring 30x22 mm; adjustable 
 
 vertically and orienting in one plane; may be attached at either side of vertical slide for paraffin or celloidin works, 
 Dimensions-Length, 2i0 mm; width, 127 mm; height. 14fi ram. 
 Possible A llachmpnis— Microtome regularly furnished without knife; plain knife No. 33744, 30 mm, with holder No. 33772 or shanked 
 
 knife No. 33753 are recommended; CO2 Freezing attachment can be fitted to this instrument. 
 
 33600. Student Microtome, without knife and holder, as described 22.00 
 
 33604. Plain Microtome Knife 90 mm, without handle, in case, but with No. 33772 Knife Holder!!!!. 5.00 
 
 33752. Shanked Microtome Knife, 90 mm, in case 5 00 
 
 MICROTOME, MEDIUM LABORATORY, BAUSCH AND LOMB, as widely used in hospiVaV laboratories.' 
 
 Feeding Mech n m h d r; can be set by simple movement of the quadrant to feed any thickness 
 
 from ni p ied with split nut which releases carriaae at any point of feed, enabling it 
 
 to be d h pp ted in metal stLrnip permanently attached to front of stand. 
 
 Object Clamp— < o g d wli lly extended will accommodate objects mea.saring 3.7 x 32 ram, adjuat- 
 
 able ^ pla L set at either side of the vertical slide for paraffin or celJoidin works. 
 
 Dimensions — gh 8 mm. 
 
 Case — Microto h h die. 
 
 Possible Atta hm n d without knife; plain knife No. 33744, 13.5 mm, with holder No. 33772 
 
 or sh d mended; 00; Freezing attachment can be htted to this instrument a« can 
 theN 
 
 33612. Medium Labo ato M o om -n kn fe and holder, as described 45.00 
 
 33616. Plain Micro ome Kn fe ^ ut andle, in case, but with No, 33772 Knife Holder. . . . 6.50 
 
 33752. Shanked Microtome Knife, 125 mm, m case 6 75 
 
 MICROTOME, AUTOMATIC LABORATORY, BAUSCH AND LOMB, a most satisfactory form of the 'sledge 
 type of Microtome for general use. A special feature is the lateral adjustability of the feeding mech- 
 anism along the entire front of the stand, providing for different cutting angles and stroke lengths. 
 The feeding is either automatic or by hand as desired. 
 
 Feeding Mechanism— Automatically operated with stroke of knife by arm extending from rear of knife block— also provided 
 with lever for hand feeditic; controlled by adjustable cam with graduated knurled button and spring click giving feed of 
 2 to 36 microns in steps of 2 microns; provided with spUt nut having convenient handles and with releasing 'lever, enabUng 
 carriage to be released at any point of feed and to be set at any desired position on the feed instantaneously; whole sup- 
 ported in a metal stirrup adjustable laterally along front of stand and secured in any position by clamping screws 
 
 Object Clamp— Of one piece, extremely rigid; engages rigidly with slide; when fully extended will accommodate objects meas- 
 uring 35 X 32 mm ; adjustable vertically and orienting in one plane; can be set at either side of the vertical slide for paraffin 
 or celloidin works. 
 
 Dimensions— Length, 344 mm; width, 158 mm; height, 218 mm. 
 
 Passible A I lach men Is— Microtome regularly furnished with knife; plain knife No. 33744, 18.5 mm, with holder No. 33772 or shanked 
 knife No. 33752, 165 mm, are recommended; Ether Freezing attachment can be fitted to this instrument, as can the Naples 
 Universal Clamp. 
 
 33624. Automatic Laboratory Microtome, without knife, as described 65.00 
 
 33628. Plain Microtome Knife, 165 mm, without handle, in case and No. 33772 Knife Holder S.OO 
 
 33752. Shanked Microtome Knife, 165 mm 8.00 
 
ARTHUR H. THOMAS COMPANY 
 
 MICROTOML MIN()TROT\R\ B4LS( H \ND LOMB 
 
 \ 1 it iid iiapiu^ei ti m tin 
 iti f t i\ instrument for piritt 
 
 Fecd ng Mechanism Ponaista of u, m 
 lull 1 p1 r 
 
 I e J ff I 
 
 I J r c ete 3 r h 
 
 Dl < 1 irk S Ml! 1 
 
 I \e^l 11 e mrot 
 
 n prcce Img pige 
 
 het heel i\h ch engas 
 
 Kiiialv used and 
 
 
 in relation to knife 
 bered from to 25, 
 d releasinK lever, by means 
 i heel protected by strong 
 
 Knife Block 
 
 fro 
 
 Diitienaion 
 Case—'' ij- [ 
 Possible A 
 
 3363C. Minot Automatic Rot in Mur 
 
 33744. Knife 1 i i I 1 1 I 
 
 MICROTOME MINOT SIMPIIFIFD ROTARY B\IS< H \ND LOMB 
 
 R tin All I )tomc t let, expci 
 
 Feeding Mechanism — Con' 
 
 ic ril e 1 with three object discs. , 
 
 . 75.00 
 .. 4.75 
 
 iLne 1 to meet the demand for a 
 
 33744. 
 MICR 
 
 eiV 
 
 Ipfll 
 
 ndel 
 
 
 
 lount of feed con- 
 o knife with pawl 
 :aas, and opera tfid 
 
 Tt m a d amcter ha ng fixed ball on ••tern unversally adjustable a socket holder; oan 
 
 r J cuttmg irfile tin 1 aecur Ij clan ped n plTce Yy conven ent screw stem of disc projects 
 
 !. coovenient adjustment from the rear, holder moves on a ■vertical slide actuated by a crank which 
 
 l:inced drive wheel with handle and stopped by a convenient locking device. Object holder on 
 
 Microtome No. 3:M36 can be substituted for that above if desired. 
 
 iron casting which is attached to base and holds knife in fixed position; adjustable to and from 
 if to permit use of entire cutting edge; knife clamp may also be tilted in its support to set angle 
 
 Dimensions— L...J nth, 1% dun ; width, 212 mm; height, 208 mm. 
 Case — Supphed in strong wooden box with handle. 
 Possible A (tachm on Is— Regularly furnished without knife, unle 
 handle i'l recommended' rot'iry object clamp No 33732 o 
 
 n mp fi d Au ma Ro a M m 
 
 T ^ }< M N T A T M4TIC PRECISION BAl 
 
 P n 
 
 specified; knife No. .^3744, 90 n 
 
 .33652. 
 33656. 
 33660. 
 33664. 
 
 33668. 
 
 1 h Z b k e C amp 
 
 R k 
 P \ k 
 
 5 00 
 5 00 
 
 d h 
 
 h 
 
 147 50 
 
Microtome, Large Brain, Sartoriuy, for niLtinji wh 
 
 
 witli thiw iiiu-niluiiK 
 
 V uf Hi- 
 for fiv, 
 
 ;ilrnlM,| - 
 
 
 4,5 cm lung aii.l %vo„< 
 
 vn \n\<\r 
 
 I'm- Ihc liilri 
 
 
 Duty Free 
 
 
 .... 420.110 
 
 33(570. 
 
 Knife and Clamp tu 
 
 liol-ls:,!, 
 
 1' ill I'CfhiiM 
 
 
 Duty Free 
 
 
 30.00 
 
 336)S0. 
 
 Extra Knife, 45 cm 
 
 uu" fur 
 
 
 
 
 
 
 33ti«4. 
 
 Object Disc, reKuI;! 
 
 
 
 
 Duty Free 
 
 
 15.00 
 
 33f;SS. 
 
 Object Disc, with c 
 
 ;iinp. 
 
 
 
 Duty Free 
 
 
 21.00 
 
 V,jj_^ ^y^ 
 
 
 iK-as ot 
 
 ImmI an. 
 
 1.3 iiiiiruns 
 „!,.■. Wil 
 
 1 111 r.lllll. 
 
 .is 
 
 lake 
 
 ■til. 11 
 
 IICL' 1111 
 
 iiiilca one 
 
 inile 
 
 Duty Paid 560.00 
 
 I Inr |i;iraffiii MCctiuus. 
 Duty Paid 40.00 
 
 No. 33lia2-.A(l»ched 
 
 Microtome. Freezing, Sartorius, suitable fur both paraffin and 
 
 :i' tho Miust lunvenient 
 "iii'N III' -]i.Tiiiiii|is frozen 
 
 : I ■! I ^'1- sections 
 
 III . ['M J I ■■ ,1 ' t clamp, 
 I. K.ii in'ijui>;, t.iiibedding 
 ■ Ml without (.'«.); Cylinder. 
 S(ock 50.00 
 
 I -.1 iif cylinder.'* in ivhich CO2 is 
 ■.K'yiin.lera. Sw IJ. 232. 
 
 celloidin cutting but \ 
 form of r 
 by means of ('< I. 
 down to 5 mil II 
 two knives with 
 CO.freiL 
 Duly Free 
 
 IVruii^eof III!-' U. ;^. 
 
ARTHUR H. THOMAS COMPANY 
 
 33708. 
 33712. 
 
 33716. 
 33720. 
 
 33724. 
 
 33728. 
 
 33732. 
 33736. 
 
 No. 3374I) 
 
 Microtome, Hand. Bausch & Lomb. This convenient little microtome is carefully made and neatly 
 fiaished. While'designed primarily for cutting sections of stems and roots, it can be used for 
 both animal and vegetable tissues. The feed is accurate and effected by means of a micrometer 
 screw, the collar of which is graduated in steps of 25 microns each. Without knife 6.00 
 
 Microtome, Table, Bausch & Lomb. This model attaches securely to a table edge or similar support 
 and is adapted to all kinds of sectioning for thicknesses of 5 microns and over. It is used largely 
 in work preliminary to surgical operations and by students in ordinary laboratory work. With- 
 out knife 12.50 
 
 Microtome Bardeen CO2 Freezing, Bausch & Lomb. This instrument was originally designed by Prof. 
 G, R. Bardeen, formerly of Johns Hopkins University, now of the University of Wisconsin, It 
 is indispensable for clinical work where sections of morbid tissues are required during an oper- 
 ation. The knife slides on glass guides. The finest feed is 20 microns. The object disc is scored 
 concentrically and measures 36 mm in diameter. The microtome may be attached directly to 
 a CO2 cylinder. We recommend for use with this microtome a special knife No. 3370S with handle 
 
 to fit the hand. Without knife 16.00 
 
 Special Knife 4.00 
 
 C02 Freezing Attachment. The freezing device in this attachment consists of a small metal cylinder. 
 The object is placed on the flat disc top of the cylinder, which measures 36 mm in diameter, and 
 is frozen by the expansion of the COj. This device is connected with the gas cylinder by a flexi- 
 ble copper tube, provided with a connecting nut for joining to the cylinder and the necessary 
 adapter for fitting to the microtome. Wc furnish it also with an extra valve, which can be 
 placed at either end of the tube. This attachment may be used with Students, Medium Labor- 
 atory, Automatic Laboratory or Table Microtomes. Complete with valve, but without cylinder 
 of CO3 9.00 
 
 CO2 Freezing Attachment as above but without valve 7.50 
 
 Ribbon Carrier, for attaching to the knife block of either of the Minot Rotary Microtomes as shown in 
 the illustration and is very useful in serial sectioning. The ribbon is of silk 40 mm wide, mounted 
 on rollers and is easily operated by a knurled head 7.50 
 
 Ribbon Carrier, same as above, for attaching to Precision Microtome 7.50 
 
 Object Clamp, for Rotary Microtomes, to replace embedding disc. With closed back and open sides. 
 Will take an object 26 mm thick 3.00 
 
 Object Clamp, as above, but with closed sides. Will take an object 28 x 26 mm 3.00 
 
 *' " Coplin, for Rotary Microtomes. Provides extreme rigidity and will take a block 32 x 
 29 mm 4.00 
 
 Object Clamp, Naples Universal for the Automatic and Medium Laboratory Microtomes. Will accom- 
 modate a block 35 x 32 mm 15.00 
 
ARTHUR H. THOMAS COMPANY 
 
 33744. Microtome Knives, a plain, straight blade wiiich may be held on the microtome either by the razor 
 
 or knife holder, or by a special holder which supports the knife at both ends. The blades are 
 true and evenly tempered. Ease and rapidity in sharpening are secured by the use of an attach- 
 able ebony handle. Each knife is furnished in a. velvet-lined case. 
 
 Length of blade, mm 90 125 165 
 
 Cutting edge, mm _82 120_ 158 
 
 Each 3.50 4.75 6.00 
 
 33745. Handle for use in sharpening above knives 1 .00 
 
 33752. Microtome Knives, Shanked, for attaching directly to the knife block by means of the clamping screw. 
 
 Each knife furnished in a velvet-lined case. 
 
 Length of blade, mm 90 12.3 165 
 
 Cutting edge, mm _S2 120 160 
 
 Each 5.00 6.75 8.00 
 
 33756. Microtome Knife, Shanked, 165 mm blade and 160 mm cutting edge. Same as No. 33752 but heavier. 10.00 
 33760. Microtome Knife, Minot, for the Minot Automatic Precision iVIicrotome . The handles are simply ex- 
 tensions of the back of which they are a part and have the same section, hence when the knife 
 is placed in the clamps it is held perfectly true. The knife may be honed in the usual manner 
 but, instead of stropping, the edge is polished by means of diamantine powder on a plane glasa 
 
 plate, 315 mm long with cutting edge of 190 mm. In velvet-lined case 15.00 
 
 33764. Glass Plate, for use in sharpening 1.25 
 
 33768. Diamantine Powder, per bottle 50 
 
 33772. Knife Holder designed to hold the plain knives for the Automatic and the Medium Laboratory 
 Microtomes and for the Student Microtome. This holder is strong and rigid and when the 
 knife is in position its upper surface is entirely exposed. 
 
 To hold knife, mm _^0 125 165 
 
 Each 1-50 1.75 2.00 
 
 33776. Adjustable Knife and Razor Holder 4.00 
 
 33780. Tilting Knife Clamp, for Precision Microtome, per pair 7.50 
 
 33784. Section Knives, for Table or Hand Microtomes, or for free-hand sectioning. Of very best quality 
 steel, with straight blade, flat on one side, and with fixed ebony handle. In case. 
 
 Length of cutting edge, mm 75 90 _ _95 125^ _ 140 
 
 Each 1.75 '2.00 ' 2.25 2.75 3.50 
 
 33788. Section Razors, folding type with perfectly straight edge. Flat concave shape with blade 75 mm 
 
 long 85 
 
 33792. Section Razor, same as No. 33788 but with both sides flat 1.00 
 
 33796. Section Razor, same quality steel as above but better finished. Flat concave shape, with blade 100 
 
 mm long 1 .25 
 
 33800. Section Razor, same as No. 33796 but 75 mm long 1.00 
 
 33804. " " " " No. 33800 but with both sides concave 1.00 
 
33808. 
 33816. 
 33820. 
 33824. 
 33828. 
 33832. 
 33S36. 
 
 33840. 
 33844. 
 
 33852. 
 33856. 
 
 Block Strop of finest leather, perfectly blocked on a solid wood back; 375 x tio mm. Coarse or fine. . . 2.00 
 
 Dressing for above Strops, per box 25 
 
 Hone. Yellow Belgian, 250 x 50 mm 3.50 
 
 150x40 ram 1.50 
 
 Blue Green, 260 X 50 mm .. 1.00 
 
 180 X 40 mm 75 
 
 Palm Oil Soap, per cake 10 
 
 Note,— The Yellow Beleian Hone with Palm Oil Soap ia used for firat grinding, followed by the Blue Green Water Hone. The above 
 hones are of the fineat possible grain, free from grit. Each is furnished in a wooden bos with cover. The Blue Hones have 
 mhbmg stoi.e. 
 
 Razor Strop, Emerson, of calf skin, 17^ inches long 2.00 
 
 Red Fibre Blocks, for celloidin sections. Size, inches. . ^x?ixf fxfx^ ix^xj IxIxJ 
 
 Per 100 3.00 ~3'M ^750 ^G^OO 
 
 Spring Back for holding microtome knives at proper angle during lioning. It is necessary for us to 
 
 have the knife in order to fit this back 50 
 
 Safety Razor Holder 4.00 
 
 Paraffin Embedding Box, for use in embedding objects in paraffin, consisting of two metal L's with a 
 
 niefal platfi. Height, mm 10 20 30 
 
 Hach .40 ^40 Mi 
 
 Embedding Table, for embedding objects in paraffin, consisting of a triangular copper plate 400 mm 
 
 lung and IHO mm wide at the large end 2.00 
 
 r^ A 
 
 . -S |g fe |g y B IS IS IS IS K IB te.L. - 
 
 No. .ICiSOIJ No. SVMii 
 
 MILK TESTING APPARATUS 
 
 33900. 
 33904. 
 
 33916. 
 33920. 
 
 ( reamometer, for showing the percentage of cream in milk, graduated from to 30% 30 
 
 " on foot, without stopcock; graduated 
 1 rom to 50% 75 
 
 Milk Testing Set. Holt, for testing human nulk, con.'sisting of two stoppered graduated 'cylinders, lac- 
 tometer and cylinder for same 2.50 
 
 Laclorneter, New York Board of Health form, with Spence scale, in which sp.gr. 1.029= ioO; length 'l2 
 inches, without thermometer 75 
 
 Lactometer, same as No. 33912 but with thermometer .'..'...'.'.'.'.'....'.'.['.'.... l!75 
 
 Lactometer, Quevenne, new design; graduated in accordance with the specific gravity scale witih first 
 two figures omitted for sake of convenience, i. e., 1.029 specific gravity = 29 Quevenne The 
 fractions in the blue columns indicate the percentage of water in skim milk, and in the yellow 
 column, in whole milk ; 165 mm long, without thermometer 50 
 
tl 
 
 32 No 3)t3f No 13141) 
 
 Lactometer, same ;is No. 33920 but 210 mm long 60 
 
 " " No. 33924 but with thermometer 1 50 
 
 Lactoscope, Feser, for determining the amount of fat in milk b> Us dtgn i oi tiinslucency With grad- 
 uated pipette, in polished wooden case, complete with direction^ for use 4 50 
 
 Milk Tester, Babcock, fitted with deep, seamless brass tubes and malleable iion tinned head. Op- 
 erates easily, without vibration or jar and may be readily attached to any table or bench. Com- 
 plete with full set of glassware, consisting of test bottles, pipette, acid measure, bottle brush and 
 bottle of acid. With directions for use. 
 
 Number of tubes ^_ 2 4_ 
 
 Each 4.00 " 5.00 
 
 Milk Tester, Babcock, for hand operation, enclosed in cast iron case with cover. Operates easily and 
 noiselessly at high speed. With complete set of glassware and directions for use. 
 
 Number of bottles _6 S 10 12_ 
 
 Each 9.00 10.00 12.00 14.00 
 
 Milk Te'iter Babcock s irai as \o 33940, but for operation iHi t i t irt i le 
 
 Numbti ot bottleb 12 _ 18^ 2^ 
 
 Each . 25.00 27.50" 30.00 
 
 Milk Tester, Babcock, International Electric Size 1, S-Bottle. These are of same construction as the 
 International Electric Centrifuges, for which the Babcock heads listed and shown here are inter- 
 changeable. With S trunnion buckets and with speed control rheostat but without glassware 
 or heater. 
 ^ 110 volls a. c. 220 rolts, a. c. 
 
 Current ^10 voUs d. c._22q_volIs d.^. 60 cycles _ _ _ eo cycles _ 
 
 Each 54.00 58.00 60.00 "" " gsVoo "" 
 
33952. Milk Tester, Babcock, International Electric Size 2. I6-Bott!e. The cups regularly furnished with this 
 machine carry all the usual styles of 7 inch Babcock test bottles and, in addition the 9 inch cream 
 test bottles may also be used. With 16 trunnion buckets, speed control rheostat and mechanical 
 brake, but without glassware or heater. HOtoIisb. c. 220 volts a. c. 
 
 Current IIO volts d. c. 22U yolta d. c. 60 cycles' * GO cy cles 
 
 Each 76.00 80.00 105.00 107.00 
 
 33956. Milk Tester, Babcock, International Electric Size 2, 24-Bottle. This is a modified form of the regular 
 .Size 2 Centrifuge, but of greater height, i.e., 40 inches and weighing about 200 lbs. With 24 
 buckets, speed control rheostat and mechanical brake but without glassware or heater. 
 
 „ ^ 110 Tolta a. c. 220 volts a. e. 
 
 Current no volts d. c. 220 volta d. c. 60 cycles 60 cycles 
 
 Each 125.60' 130.00 140.00 145.00 
 
 33960. Electric Heater for International Milk Testers, for convenience in heating the test bottles while in 
 
 the centrifuge, operating on the same current as the motor. 
 
 For Milk Tester Number ^33948 33952 _ 33956 
 
 Price of Electric Heater attached 11.50 " 12.50 12.50 
 
 Glassware for Babcock Test, in accordance with the specifications formulated by the U. S. Bureau of Stand- 
 ards for standard Babcock glassware and adopted by the Official Dairy Instructors Association. 
 
 33964. Milk Test Bottle. 8%, 18 grams, so-called "6 inch" bottle. Each 25 
 
 33968. Cream Test Bottle. 507^, 9 grams. Length, inches 6 9 
 
 Each 40 .45 
 
 33972. Pipette, Babcock, delivering 17.6 cc in 5 to 8 seconds at 20° C. Each .20 
 
 3.3976. Skim Milk Bottle, double bore.- Patent. Graduated in 20 % TTrTF% 
 
 Each " ".50 .50 
 
 33980. Acid Measure, 17.5 ec 10 
 
 33984. Acid Burette. Number of 17.5 cc charges 3 6 12 25 
 
 Each 2.00 2.00 2.50 3.00 
 
 33988. Combined Acid Bottle and Pipette. For storing acid and delivering charges of 17.5 cc 5.00 
 
 33992. Milk Tester, Heeren (Pioscope), for determining the richness of milk by comparison with standard 
 
 colors 1.00 
 
 33996. Paper, Schleicher & Schiill, No. 571, fat extracted for milk analysis. See M. A. Adams, "Analyst," 
 
 1883, p. i6. In .strips 56 x 65 mm. Per 50 strips 1.75 
 
 34000- Slide Rule, Richmond, for calculating the total solids in milk 4.00 
 
No. 4031)0 
 
 n 
 
 No. 40312 
 
 40308. 
 40312. 
 
 Balance, Torsion, for cream test, with aiidiiig tare weight, weight pan, special bottle holder and arrest; 
 sensibility 1 centigram; with special 9 and 18 gram weights. 
 
 For, bottles 1 2 J_ 
 
 Each 12.00 13.00 15.00 
 
 Fat Extraction Tube, Rohrig, for use in the Rose-Gottlieb method; 4G cm high with a capacity to base 
 of neck of 87J cc. The delivery tube with stopcock is so placed that its center line coincides with 
 the surface of 23 cc of liquid in the main tube. With polished wooden base with indentation for 
 flask, but without flask as shown in illustration. As used in the Dairy Laboratory, Bureau of 
 Chemistry of the U. S. Department of Agriculture 2.25 
 
 Galactometer, Adam, with two bulbs and glass stopcock 2.50 
 
 Automatic Reckoner, Ackermann, for dry substances in milk, with directions 2.00 
 
 sliawing special stands for the display of Beakers, Fla^k^, 
 
MINERALOGY, CRYSTALLOGRAPHY. PETROGRAPHY, ETC. 
 
 Note — We are enabled to offer by special arrangement with the maker, the optical measuring instru- 
 ments for Crystallography as designed by Prof. Victor Goldschraidt, of Heidelberg. Original 
 catalogue is sent on application. 
 
 40400. Goniometer, Grinding, Goldschmidt. complete as described in Zrtt^rlir fiir Uuiy free Outy Paid 
 
 Kri/.^hdln,,'-. l.9l.-\ B'l. SI, Srilr .U9 ". . , 690.00 920.00 
 
 40404. Goniometer, Two-Circle type. Goldschmidt, Model 1910, complete as describeil 
 
 in Zril.-,rhnfl f,iy Kri/f'/riU.ofir.. 1898. Bd. 29, Seile 333 .360.00 480 00 
 
 40408. Goniometer, Two-Circle type, Goldschmidt, aa above, simplified model 240.00 320.00 
 
 40412. Accessory U< f lie ;ibovc for the photography of oriented specimens 21.00 2s!oO 
 
 40416. Application Goniometer, Pcnfield, pocket form, from stock l]2.5 
 
 40420. Crystal Modeling Apparatus, Goldschmidt, as described in Zeilachrifl fur 
 
 Kra.h.JInur. I9fis. B,l. .J,:7, Srltf 573 ■.,;,,, 120.00 160.00 
 
 40424. Mineral Sectioning Apparatus, Wiilfing 11.40 \^ ■>() 
 
4042b. 
 
 40432. 
 
 40436. 
 40440. 
 40444. 
 
 40452. 
 40456. 
 40460. 
 40464. 
 
 40476. 
 40480. 
 40484. 
 
 Goniometer, Goldschmidt, lurgt; model, for the measuring of very large erys- 
 tals, complete as described in Zeitschrift fur Knj^tallofjr. WW, Bd. 1,7 , 
 Seilc SO 
 
 Application Goniometer, Two-Circle type Goldschmidt, an improvement of tiie 
 1806 model, as described in Zeitsckrijt Jiir Krystallogr. 1S96, Bd. 25, Seile 
 
 No. 40449 
 
 
 Duty Free 
 
 Duty Paid 
 
 540.00 
 
 720.00 
 
 SSI.. 
 
 15.20 
 
 150.00 
 
 7.50 
 
 200.00 
 
 10.00 
 
 Axial-Angle Apparatus, Wiilfing, complete in accordance with Neues Jahrbuck 
 fur MineraLogie. 1899, Beil. Bd. 12, Seite 343 
 
 Tourmaline Tongs, with condensing lens. Price varies in accordance with the 
 perfection of the tourmaline plates. A good specimen may be had for 
 
 Tourmaline Specimens, mounted in cork mounts, 48 x 28 mm, for demonstration of optical properties 
 of crystals in potariscope, dichroscope, etc., and very suitable for use with tourmaline tongs, 
 and illustrating all of the six crystal systems, are to be had at prices varying in accordance 
 with the perfection of the specimens. On this account it is difficult to list these specimens but 
 complete lists of the best European preparers will be sent on application. 
 
 Grinding and Polishing Machine, Gasser, designed especially for the preparation of micro sections 
 of bones and teeth. The table is rigidly constructed and is 1 meter in height, and is provided 
 with a zinc dish in which the revolving lap operates, so that grinding may be done under water 
 if necessary. The electric motor drives the lap at a speed of 1.500 r.p.m. while above the table 
 a heavy support carries the specimen spindle, provided with knob for hand guidance and adjust- 
 able ring for regulating the thickness of the specimen. The specimen discs are 5 cm in diameter. 
 Bone sections may be ground and polished corapletely in ten minutes and teeth sections in 20 
 minutes. Outfit consists of apparatus with motor (Voltage must be specified in ordering), start- 
 ing rheostat, connecting plug, two 15 cm grinding discs of different 
 degrees of fineness, one 15 cm metal disc for poUshin^i and four speci- 
 men discs 
 
 Extra Grinding Discs, 15 cm, each 
 
 Polishing Discs, 15 cm, each 
 
 " Specimen Discs, 5 cm, each 
 
 Grinding and Polishing Machine, for minerals and metals, identical in construction with above but 
 with gear providing a speed of 2000 r.p.m. to the grinding disc and with disc 20 cm in diameter. 
 With automatic gear for rotating the spindle carrying the specimen disc during the process. 
 Removable lead weights provide means of regulating the pressure upon the specimen disc when 
 automatic gear is used. An adjustment ring upon the spindle automatically ends the grinding 
 when the desired thickness of specimen is reached. Outfit consists of motor (Voltage must be 
 specified in ordering). With rheostat and connecting plug, two 20 cm grinding discs of silica- 
 carborundum compound of different cutting capacities and 20 cm disc Duty Free Duty Paid 
 of metal for polishing and two specimen discs 5 cm diameter 92.40 112.00 
 
 Grinding and Polishing Machine, as above, with two specimen spindles for 
 
 simultaiK'Ously grinding two specimens and with four discs 118.80 144.00 
 
 Grinding and Polishing Machine, as above, with four specimen spindles for 
 
 siiriultancuusly grinding four specimens and with eight discs 151.80 
 
 Extra Grinding Discs, of Silica-Carborundum, 20 cm diameter, each. . . 6.60 
 
 " Polishing Discs, of metal, 21) cm diameter, each 4.00 
 
 " Specimen Discs, eacli -70 
 
 Duty Free 
 
 Duty Pai 
 
 66.00 
 
 80.00 
 
 1.63 
 
 2.00 
 
 .70 
 
 .80 
 
 184.011 
 
 .80 
 
GONIOMETER, HUTCHINSON UNIVERSAL, for use as mi ordinary gnniumetcr for the measurement of angles, 
 aa an axial-angle apparatus, as a Kohlrauach total-retlectometer and for determining refractive 
 indices by the prism method. It is intended primarily for the examination of small crystals and 
 by its aid all the usual crystallographic and optical determinations can be readily carried out. In 
 its design the attempt has been made to combine efficiency with simplicity and strength of construc- 
 tion, together with adaptability to a great variety of purposes. 
 
 A circle D, five inches in diameter, graduated tja i degrees and readiag by a vernier to minutea, ia supported by a atout 
 bracket 5. at a height of ten inches above a flat base-plate P, eleven inchea square. The circle is provided with a alow- 
 ttacliment and an be lamppd h> the screw E. A ateel rod, wnich can be clamped at any coovenient positLoQ by 
 ' ' ' ■• . 1 - ■ lower end, the ordinary centringand adjusting arrange- 
 
 S, gives the means of raising the adjust- 
 
 the screw F, pa«aea it 
 ments shown at ' ^ 
 ing head and of b''jj 
 
 A telescope -1 inc 
 being provided for thii 
 ameter and abo it 4 m 
 tional lens of 2i inches 
 thereby converting thp 
 
 The telescofe and 
 be fonndauitaHe) and 
 tube, which is eight i ' 
 
 
 of the circle and cai 
 iirse cil jr wh h ran ba damped to the rod by the a< 
 lo Ting it tj Its former position, 
 
 d t j.t r ' IT icurely clamped to the base-plate 
 
 1 t positions. TheoliJL-i-i i^li^^'-. n 
 
 I rieir tubes are earn.' i i 
 
 This can be alippi- I ■ i ■ . ■ • i i 
 ] L I low power with !■ !■ 
 
 r r c t i 13 rranged ao that its optic.'il ;i>;i.'i liit 
 loog IS moM'd b\ an ordinary coarae a 
 ■ below the telescope. 
 
 40496. 
 40500. 
 40504. 
 
 . ... ;r ahown at A", a number of holes 
 
 .-. Ill III- U'lcacope antj collimator are } inch in di- 
 
 ■" - . ! -iviiled with adjusting screwa. An addi- 
 
 ■ II' II froat of the objective of the telescope, 
 
 I' r .1 l1 can be examined. 
 
 r I'l lii-r (■tome angle between 60* and 90° will 
 
 I liiwels the angle between them. The microscope 
 lent actuated by a pair of milled heads, one of 
 
 . . . _ _ a the fitting of an objective changer of the Zeiss 
 
 pattern which enables different objectives to be rapidly slipped into position and provides a means of adjusting them to the 
 axis of the microscope. Objectives of J inch and of 2 inchea focal length will be found the most generally useful, but others 
 can be employed if desired. At the other end a nicol jV slips on over the eye-piece; the latter and the nicol-holder are 
 slotted to admit of the insertion of a quarto-wedge or mica-plate. A Bertrand lens L slides into tlie body of the microscope. 
 An adjiiatable table T, which can be levelled by the screws W, ia carried by a steel rod which can be clamped by the 
 screw Q; a loose collar clamped to the rod by a screw enables the table to be rotated when supported at any convenient 
 height. On this table can be placed a tank, when it is desired to observe the crystal immersed in a liquid. 
 
 Two extra fittings, not shown in the figure, are also provided. One enables a ahort tube containing a nicol and a con- 
 densing lens to be placed opposite the objective of the microacope. The other can be damped to the graduated circle: at 
 ita lower end it carries a collar into which the telescope A can be screwed, thus enabling the latter to be supported at the 
 aame height above the base-plate (3} inches) as the collimator and microscope. 
 
 Universal Goniometer, as above, with 2 inch and ^ inch microscope objectives 
 and centering objective changes 
 
 Special Objective, with centering changes and webbed ej'epiece for using 
 microscope as a telescope 
 
 Gla.<<$ Tank, with optically plane face and Centigrade thermometer 
 
 Sliding tank holder 
 
 Case, for camnlr>te outfit 
 
 40512. Dichroscope, von Lang, improved form, in case 
 
 40516. Dichroscope, with revolving stage and graduated circle, with spectroscope 
 
MICROSCOPE, BAUSCH & LOME PETROGRAPHICAL, RESEARCH MODEL LD. This microscope, except 
 
 for certain mechanical details, is patterned after the microscope described by /''. h'. Wricihl in Amer. 
 
 Jour, of Sciehce, U) 29, 407-4U, 1910; also in '-The Methods of Petrographic Alicroscope Research." 
 
 Carnegie Institution of Washington Puhlication 158, 1911. 
 
 The special features of this research model are; — 
 
 Large Abbe Aplanatic Condenser, N. A. 1.40, which, together with an Ahrens prism of 20 mm aperture, 
 ran be used both with high power and low power objectives. 
 
 Special Mounting for Polarizer, which can be swung in and out of axis of microscope at will. 
 
 Large Sensitive Tint Plate mounted in rotating carrier below condenser. This arrangement is superior 
 in two respects to the usual method of inserting; the plate above the objective: the optical system 
 is not disturbed on insertion of the plate; the mounting enables the observer to rotate the sen- 
 sitive tint plate and thus to vary at will the inteusity of field illumination produced by the plate, 
 also to pass from one quadrant to another. In very weakly birefracting minerals it is essen- 
 tial that the field illumination from the sensitive tint plate be very weak; otherwise the faint 
 interference colors from the fine mineral grains, either in parallel or in convergent polarized 
 light, will be veiled and lost to view in the intense illumination of the field produced by the 
 sensitive tint plate in the usual diagonal direction. 
 
 Large Mechanical Stage, simple in design and construction and practically dust-proof, with a play 
 of 24 mm in two directions at right angles, the divisions on the screw heads reading to 0.01 mm. 
 
 355 
 
MICROSCOPE, PETROGRAPHICAL (continued! 
 
 Large space between stage and arm, necessary for manipulation of universal stage and other acces- 
 sories; also for opaque mineral investigations in reflected light. 
 
 Objective Clamp and rings of case-hardened steel. 
 
 Device for simultaneous rotation of Nicols. 
 
 Wide Draw Tube useful for photomiero graphic vi^ork. 
 
 Entire analyzer carrier included within body tube and thus protected from dust. Even when the 
 analyzer is withdrawn from axis of microscope, it is still within the tube. 
 
 Bertrand lens slide accurately constructed to insure exact centering. Below the Bertrand lens is an 
 iris diaphragm and above it a small lens on an arm, which, together with eyepiece, formsa micro- 
 scope focused on the plane of the iris diaphragm and enables the observer to bring the image of 
 the object on the stage to coincidence with the plane of the iris diaphragm and thus to insure 
 elimination of stray light from adjacent mineral grains in the case of the measurement of the 
 optic axial angle of a mineral grain or plate in a specimen. 
 
 Rack and Pinion movement for Bertrand lens, permitting one to raise or lower it and thus change the 
 magnification of an interference figure from one to two diameters. 
 
 Specifications of Stand 
 
 Arm — Curved type, providing ample vertical distance from stage to arm of 60 mm; horizontal distance from center of stage 
 
 TBbe— Body tube, 55 mm outside diameter, with inner tube adjustable by rack and pinion (two heads) through a range 
 of 25 mm; inner tube contains a Bertrand lens, with an auxiliary lens above it and an iria diaphragm below it, 
 each adjustable from the right hand side of the body tube; draw tube slides in metal fitting graduated in single 
 millimeters and numbered 160, 170 and 180, taking standard sized (23 mm) eyepieces, which are supplied here with 
 cross-hairs and the eye-lens adjustable tor focusing upon them; notch in the upper edge of draw tube fises azimuth 
 of the eyepiece; within the lower portion of the body tube tiie analyzer is mounted to sUde in and out of the optical 
 axis on the rotating arm; 45° slot ia body tube with dust-proof shutter placed just beneath the analyzer for acces- 
 soriea; provided with non-detachable nose-piece, centering by meansof twoacrews working at right anglesin N and 
 E positions. 
 
 Focusing Adjustments — Coarse adjustment by standard rack and pinion; fine adjustment of Bauach-Lomb lever type 
 with micronieter screw head graduated in 100 parts, each equal to .0025 mm in vertical movement, and provided 
 with a vernier sliding vertically to follow rise and fall of micrometer head for reading to .0005 mm; mechanism 
 ceases to act when objective touches slide. 
 
 Stage — Revolving, with clamping device ("5 set in any desired position; circumference graduated in single degrees with 
 each tenth line numbered, the two verniers reading to 0.1°; two additional verniers, also reading to O-l", are at- 
 tached to the support of bar connecting nicols; outside diameter of graduated circle, 112 mm; mounted o '' 
 volving stage is an adjustable stage plate, 95 mm in diameter, with mechanical cross ... 
 
 uated heads set 90° apart, the graduations reading to 0.01 mm; stage aperture, 32 n 
 an aperture of 19 mm. 
 
 Snbstage— Adjustable by rack and pinion; carries condenser, iris diaphragm, aelenite plate and polarizer. 
 
 U laminating Apparatus — Aplanatic condenser, 1,40 N,A., with upper two lenses removable, giving 0.40 N.A. with lower lens 
 alone; placed in fixed aubstage arm with small set-screw and is easily removable; iris diaphragm below condenser; 
 mirror, plane and concave, 50 mm in diameter, with fork ia socket adjustable along substage support. 
 
 Polarizer — An Ahrens priara in revolving mount attached to swinging arm, permitting complete removal from optical 
 axis; above the polarizer, attached to the iris diaphragm mount, is a revolvable carrier for sensitive tint plate (20 
 mm outside diameter), itaelf carried in sliding mount allowing withdrawal from, and return to, optical axis. 
 
 Analyzer — A Thompson prism, revolvable a quarter turn, insliding prism-box, allowing withdrawal from, and return to 
 optical axis entirely within the body tube. 
 
 Simultaneous Rotation of Nicols— Rigid bar is supported at plane of stage by arms moving through 90°, with two 
 verniers to provide for reading angle of rotation; connsction arms, with broad bearing surfaces, extending from 
 analyzer and polarizer carriers engage bar in such a way as to permit free movement of body tube and aubstage 
 wnen focusing and to eliminate lost motion; bar ia movable in its support for instant release of arms, allowing inde- 
 pendent rotation of polarizer or analyzer; a clamping device with milled head on one of the verniers sets the bar 
 support against rotation, to permit tne principal nicol planes to be set parallel with croaa-hairs of eyepiece and to 
 provide for rotating specimen on stage rather than rotating connected nicola. 
 
 Changing Noaepiece — Consists of two parts: — ^the upper one with clamp permanently attached to centering nosepiece, 
 the lower, a ring threaded to take objectivs; ring and socket in which it fits made of steel tor long term service; 
 with ring for each objective quick interchange is provided for. 
 
 Accessories Included— Bertrand lens, rnounted; one aelenite plate, mounted, to f 
 glasa and ground glass for insertion below condenser iris diaphragm wht 
 optical asia. 
 
 Finish — Principal parts in alcohol-proof black; smaller adjusting heads and bar nickel-plated; graduated ci.-cleB 
 
 Case — Of hard wood with polished finish, fitted with brass lock and key. 
 
 $311.75 
 320.00 
 
 40520. LD Ifimm, 4mm j 7.5X, lOX. With two rings 
 
 40524. LD 32mm, 16mm, 4mm ! 7.5X. lOX, 12.5X ' | With three rings 
 
 For the measurement of the optical constants of mineral grains and plates, the following accessories are 
 essential : 
 
 40528. Universal Holder and Positive Eyepiece to be used with the following accessories 15.50 
 
 40532, (a) Graduated Quartz Compensator for the measurement of birefringence 17.25 
 
 40536. (b) Bi-Quartz-Wedge Plate for the measurement of extinction angles 19.50 
 
 40540. (c) Co-ordinate Grating, 0.1 mm divisions, for the measurement of optic axial angles and for 
 
 f^tatictical mineral volume analysis after the Rosiwal method or the percentage area 
 
 method 10.00 
 
 40544. (d) Cap Analyzer with 2" graduations for use above positive eyepiece, fitting into recessed 
 
 plate with means for a sufficient rotary adjustment to permit accurate setting of the 
 
 index point with zero of the analyzer g.OO 
 
 40548, Sliding Stop Eyepiece for the observation of interference figures from fine mineral grains; substituted 
 for regular eyepiece; consists essentially of two adjustable slits at right angles with special eye- 
 piece for focusmg on the same 12,50 
 
 40552. Adjustable Support for opaque objects: replaces condenser in substage; two adjustable screws set at 
 right angles tilt the table in any direction desired; the object table revolves 10 00 
 
 40556. New Model Vertical Illuminator 12 00 
 
 40560. Petrographical Objective, 0.95 N. .V., 4.5 mm E. F ...,,..'!! .^ ' ^ 8^00 
 
40564. 
 40568. 
 40572. 
 
 id numbered 160, 
 1 diameter] eye- 
 zing two notches 
 body tube with 
 ■detachable, cen- 
 
 MICROSCOPE, BAUSCH AND LOME PETROGRAPHICAL TYPE LCH. Tlie features of this new model are 
 the unusually large space provided for manipulation of objects and super-stage accessories; the mount- 
 ing of rotatable analj'zer; the arrangement of the aubstage parts for quick change from polarized to 
 ordinary and from parallel to convergent light. It is a high-grade instrument combining the efficiency 
 and simplicity of adjustment which are commensurate with the requirements of laboratory work. In 
 designing this instrument the Bausch & Lomb Optical Co., have had the kind assistance of Dr. Wright, 
 of the Carnegie Institution of Washington, D. C. 
 
 Tube — Body tube. 35 mm outside diameter; draw-tube, sliding in metal fitting, graduated in single millimetei 
 170 and ISO; having slot for Bertrand lena, with an iris diaphragm above it; taking standard aize (23 
 pieces, which are supplied here with croas-haira and the eye-lens adjuatable for focuaing upon them; 
 in upper edge for fixing the azimuth of the eyepiece; analyzer bos alidea in and out of body tube; sic 
 duat proof shutter placed just beneath analyzer for acceaaories; noaepiece with aociety screw thread, : 
 tering by means of two screws working at right angles in N and E positions. 
 
 Focusing Defices— Coarse adjuatment by atandard rack and pinion; Sne adjustment of Bausch & Lomb lever type with microm- 
 eter screw liead graduated in 100 parts, each equal to .0035 mm in vertical movement, and provided with a hinged 
 vernier for reading to .0005 mm, mechanism ceaaea to act when objective touches ahde. 
 
 Stage — Revolvable; circumference graduated in single degreea with each tenth line numbered, the double vernier reading to one- 
 tenth degree in both directions; diameter of stage outside of graduations 102 mm, inside 90 ram; stage plate, vulcanite- 
 covered, having inlaid for orientation two millimeter scales at right angles. 30 mm long, with each tenth line numbered. 
 
 Substage — Adjustable by long-range quick-acting screw, turning to the left completely clear of the optical a.-ds when screw reaches 
 limit of downward movement; carrying condenser, iris diaphragm and polarizer. 
 
 Illuminating Appsratus^Three-lens condenser, 1.10 N.A.; upper lenaea in awinging arm operated by knurled head at the side, pro- 
 viding for quick change from convergent to parallel light without disturbing any of the other substage parts; iris dia- 
 phragm below condenser; mirror plane and concave. 50 mm diameter, on swinging arm with spring clip for central position. 
 
 Polarwer— A Nlcol priam 'angnlar field 19°) in revolving mount graduated in lo degree parta, each alternate line numbered— 0, 30. 
 60. 90 and so on up to 330; entire mounting with prism removable from optical axis by a double-swing movement to ons 
 aide. 
 
 Analyzer— A Thompson prism, revolvable a quarter tiirn, in sliding-prism-boic 
 withdrawal and return to optical axis without disturbing the reading o 
 0.30. 60 and 00. 
 
 Changinfi Nosepiece — As shown in illustration, consists of two parts, the upper c 
 the lower, a ring threaded to take objective. The ring and the socket i 
 With a ring for each objective, quick interchange ia provided for. 
 
 Accessories Included — One selenite plate, mounted, one quartz wedge. 
 
 trand lena. mounted; pinhole cap fitting draw-tube for obaerv 
 
 Finish — Main parts including body-tube in alcohol-proof black, pinion heads 
 heads nickel plated; all graduations in German silver. 
 
 Case — Of hardwood with poliahed finiah; fitted with brass lock and key. 
 
 Oulfit Objerfivea Cross Hair Eyepieces 
 
 LCH2 16 mm " 4nim "~ 7.5 X 10 X 
 
 LCH4 32 mm 16mm 4 mm 7.5 X 10 X 
 
 tr Undulation plate, mounted, and Ber- 
 
 16 mm 
 32 mm 
 
 Glass Model of Nicoi Prism, Vrba, on adjustable 
 free 
 
 Quick Changing Nosepieces 
 
 With Two Rings" 
 With Three Rings 
 upport, 30 cm in height, for lecture table use, duty 
 7.35 
 
 .5 X 
 
 15,3.65 
 160.00 
 
ARTHUR 
 
 H O M A 
 
 COMPANY 
 
 ^ 
 
 
 EB eE 
 
 
 
 2 
 
 1 
 
 A. 
 
 ^ 
 
 
 Polarization Model, Vrba, consisting of four metallic rods with crosspieces of various lengths set at 
 right angles thereto and representing: — 
 
 1. The ether vibrations in an ordinary beam of light, i.e. vibrations in various plunes. 
 
 2. " ■' " " a plain polarized beam of light, i.e. vibrations ail in one plane. 
 
 3. " " " ■' ■circular polariied beam of liglit, i.e. vibrations in a spiral plane, laevo-rolary. 
 
 4. " " " " ■' circular polarized beam of light, i.e. vibrations in a spiral plane, dextro- rotary. 
 
 Set of 4 models 6.50 
 
 Glass Rhombohedron. Busz, for demonstration of double refraction in calcspar, on adjustable support 
 with base, duty free fi.7.5 
 
 40584. 
 
 40588. 
 
 Models of Crystal Axes, a set of six wooden axes showing the axial arrangement of each of the six crys- 
 tal systems, 15 cm size. When ordered with models, duty free.. 4.50 
 
 Models of Crystal Axes, as above, 25 rm size, duty free 6.30 
 
 Models of Crystal Axes, consisting of a set of six metal supports with colored silk threads to indicate 
 positions of surfaces. The models are 38 cm in size, with supports and are very well suited tor 
 lecture table demonstrations, duty free 24.00 
 
 Models of Crystal Axes, as above, 50 cm size, duty free 30.00 
 
 358 
 
No. 40G00 
 Crystal Models, Pear Wood, consLstinfr ofaset of 30 models demonstratiiiff the simpler fundamental 
 
 I, Regular, Nns- I to 1 
 11. Hexagonal. Noa. 14 
 in. Tetragonal, Noa. 21) 
 
 Models, as above, 
 
 forms of the six orvstal systems as follows :- 
 
 IV. Rhombic, Nos. 24 lo 27. 
 1 ig V. Monosym metrical, Nos. 2S and 29. 
 
 „ 23* VI. Ass>inetricat. No. 30. 
 
 /ith 5 cm models, in polished compartment case, from stock 10.00 
 
 u u " " 10 cm " " " " " dutyfree 18.75 
 
 Crystal Models, Pear Wood, consisting of a set of 20 models supplementing the preceding set of 30 
 and whicli add some of the more ordinary combmations and twin developments. 
 
 Models, as above, 5 era size, in polished compartment case, from stock U.W 
 
 " " 10 cm" " " " dutyfree 17.40 
 
 Crystal Models, Pear Wood, lecture table set of 30 models, each of 20 to 25 cm size, with blackened 
 surfaces for marking with crayons. The arrangement of the models is exactly the same as in 
 set No. 40600. Imported to order only, duly free. ......... .^ ■■■-■■■■■■■,■■■■■ ,f*-?" 
 
 Crystal Models, Pear Wood, Hintze, consisting of a set of 80 models including the holohedral, hemi- 
 bedral and tetartohedra! forms, to which are added the designations of the new arrangement by 
 Groth, Fl.ysikut. KiysUdlugmphie, 4. Aujl. and Liebisch, Grundmss der phy^ikuL Krystalio- 
 
 Models, as above, 5 cm size, in polished compartment case, duty free 21.60 
 
 « « .' iQ " " " " " " duty free 60.00 
 
 40616 Crystal Models, Glass, with colored silk axes, consisting of a set of six models representing the six 
 crystal systems with a typical form of large size, i.e., 20 to 25 cm, from each system; specially 
 adapted for lecture table use. In case without supports, from stock 9.00 
 
40620. Crystal Models, Glass, consisting of a set of 15 
 models of the same size and execution as the 
 above but representing the more important 
 fundamental forms of the six systems. In 
 polished wood case; duty free 14.40 
 
 Crystal Models, Glass, consisting of a set of 9S of 
 the same size as above, i.e., 20 to 25 cm, and 
 same execution as the preceding sets, composed 
 of six separate collections which may, if de- 
 sired be ordered separately as follows: 
 
 40624. Crystal Models, Set B, 14 models showing tiie simpler pyramidal and prismatic forms of the six crystal 
 systems and their relative position to each other. In polished wood case. Duty free. . , . 13.20 
 
 40628. Crystal Models, Set D. 30 models showing the simpler fundamental forms, with colored axes in 
 polished wood case. Duty free 34.20 
 
 40632. Crystal Models, Set E. 10 models showing the simpler hcmihcdral forms, the holohedral form being 
 made of cardboard and enclosed in the former. In polished wooden case. Duty free. . . , 16.80 
 
 40636. Crystal Models, Set F, 18 models showing the simpler combinations; in polished wooden case. Duty 
 free 30.00 
 
 40640. Crystal Models, Set G. 16 models showing the complex crystals of holohedral and hemihedral forms. 
 The combination is made of cardboard and is shown inside the glass model which corresponds 
 to the faces of the simpler form of the combination. In polished wooden case. Duty free . 26.70 
 
 40644. Crystal Models, Set H, 10 models of twin crystals arranged so that each part may be rotated about 
 the twinning axis. In polished wooden ease. Duty free 20.40 
 
 40648. Complete Set of 98 Models, consisting of six collections as above, without boxes and if ordered at one 
 time, duty free 108.00 
 
 40652. Crystal Models, Cardboard, Vrba. These models are of the large lecture table size, i.e., 16 to 25 cm. 
 and are stoutly made of sized cardboard with yellow faces and black binding. Complete arrange- 
 ment of 60 models, duty free 40.50 
 
 40656. Crystal Models, Cardboard, Vrba, as above, but a smaller set consisting of 30 representative models, 
 
 duty free 21.00 
 
 Note — For large collections of 520 models arranged by Vrba, send for Krantz special catalogue No. 11. 
 
 40660. Supports for Crystal Models, Vrba, a three-arm support for simultaneously displaying three large glass 
 or cardboard models. When ordered with models, duty free 3.60 
 
 40664. Supports for Crystal Models, Krantz, a new set of ten holders on individual bases, suitable for demon- 
 strating all ordinary forms; duty free 13.50 
 
 40668. Supports for Crystal Models, a simplified set to support the six principal forms, on adjustable support 
 with base, duty free 9.00 
 
hi O M A 
 
 40672. Petrological Collection of Rock Forming Minerals, Busz, with both micro and lantern slides of each speci- 
 men, consisting of a set of 25 of the most important rock forming minerals each with its mounted 
 thin section for use with the microscope and a lantern slide made from a tnicro-photograph of 
 same for class room demonstration, with a copy of Part I, "KleinenpetrographischenPraktikiim." 
 
 Specimens are 4x6 cm; duty free 22.50 
 
 40676. Petrological Collection, Busz, supplementary set to above, consisting of 14 eruptive, 6 crystalline and 
 6 sedimentary rocks, illustrating Part II of "Kleines petrographisches Praktikum," with copy 
 
 of same. Specimens are 6^ x S; cm ; duty free 24.00 
 
 40680. Petrological Coliection of 100 Rocks with Micro Sections of each, arranged in accordance with Credner's 
 "P^lements of Geology," edition of 1912, in wooden case with four trays and separate case for 
 
 the 100 micro thin sections; size of specimens 6| x 84- cm; duty free. . , 60.00 
 
 Mineralogical Collections, arranged by Klockmann: "Lehrbuch der Mineralogie." V and VI Editions; con- 
 sisting of 120 specimens divided as follows:^ 
 I. Elements. Noa. I to 5. 
 II. Sulphides. N<>». R to 24. 
 
 HI, Oiidee, Hydrates and Oxyl salts. Nos. 25 lo 110 
 IV. Haloids. Nos. Ill to llC. 
 V. Organic Compounds, Nos. 117 to 120. 
 
 Collection, as above, with specimens 3x4 cm, each in separate cartons. Stock 18.00 
 
 with specimens 3x4 cm.inwoodencasewithcompartment trays. Stock 23.00 
 
 " " " with specimens 5x6 cm, in separate cartons; duty free 21.60 
 
 " with specimens 5x6 cm, in case with compartment trays, duty free. . 29.10 
 
 with specimens 6x8 em, in separate cartons; duty free 33.00 
 
 with specimens 6x8 cm, in ease with compartment trays; duty free. . 43.50 
 arranged by Brauns, consisting of a basic collection of 70 specimens, a first sup- 
 plement of 98 specimens, a second supplement of 47 specimens and a third supplement of 35 
 specimens. The basic collection and the supplements are sold separately so that the basic 
 collection may be ordered first and the supplements from time to time until the collection is 
 finished. For a complete list of the specimens in this collection send for Ivrantz catalogue No. IS. 
 
 Complete Collection, as above, with specimens 5 x G cm, duty free 84.00 
 
 " " " " " 6x8 cm, duty free 141.00 
 
 " " " " " " 5x6 cm, in polished oak ca.se with five drawers 
 
 with individual compartments for each specimen, duty free 101.40 
 
 Collection, as above, with specimens 6x8 em, in case as above, duty free 161.40 
 
 Mineralogical Collections, arranged to illustrate the physical properties of Minerals, consisting of 200 speci- 
 mens distributed as follows: — 
 
 Crystalline, crystallized and amorphous 
 
 state 10 specimens 
 
 Specific BTST'ty l" " 
 
 Tenacity 4 " 
 
 Fiacture 7 " 
 
 Direction of cloavaee 13 
 
 Degree of cleavage 5 " 
 
 Structure 12 " 
 
 Degree of hardness 10 " 
 
 Different hardness in the same mineral... . 1 " 
 
 Metallic colors 15 " 
 
 Non-metallic colors — 40 " 
 
 40684. 
 40688. 
 40692. 
 40696. 
 40700. 
 40704. 
 Mineralogical Collections, 
 
 40708. 
 40712. 
 40716. 
 
 40720. 
 
 Degree of transparency. . 
 
 Kind of lustre 
 
 Double refraction 
 
 Pleochroism 
 
 6 specimens 
 
 Blending of colors 3 
 
 Aeterism 1 
 
 Phosphorescence 3 
 
 Electricity 2 
 
 Magnetism 1 
 
 Varii 
 
 n the 
 
 40724. 
 40728. 
 40732. 
 40736. 
 
 Various colors in the same crystal 2 " 
 
 Collection, as above, with specimens 5x6 cm, duty free 60.00 
 
 " " " " " 6 X S cm, duty free 97.50 
 
 " " " " " 5x6 cm, in ease with compartments; duty free. . 69.00 
 
 Collection, as above, with specimens 6x8 cm, in case as above, duty free 109.50 
 
No. 408J8 
 
 ielerted. With pestle. Ijii 
 3.T 40 .50 
 
 3 givcTi arc outside 
 
 100 
 
 10804. 
 40S08. 
 
 40812. 
 40816. 
 40820. 
 40824. 
 
 40828. 
 
 40836. 
 40840. 
 
 40844. 
 
 40848. 
 
 Mortars, Agate, carefully f 
 
 Diameter, mm 
 
 Each rso 1J5 2JM XSO 4 50 7.00 8.50 
 
 Mortar, Diamond, Leeds, of hardest steel 2.00 
 
 120 
 15.00 
 
 Plattner, of hardest steel. Outside diameter, mui. 
 Each 
 
 Mortars, Glass, with pestle. Capacity, ounces 2 
 
 Diameter, inches 2J 
 
 Each 20 
 
 Mortars, Iron, with pestle. Actual capacity, cc 250 
 
 Outside diameter, inches 4i 
 
 Each 50 .60 
 
 Mortars. Porcelain, with spout and pestle, glazed outside, rough inside. 
 
 Outside diameter, mm. . . . m RO 110 130 Vn_ 
 
 Each .15 .20 .40 ".50 .70 
 
 Mortars, Porcelain, with spout and pestle, glazed inside and outside. 
 
 15_ 
 l.OO 
 
 16 
 
 25 
 
 s.oo 
 
 350 
 4i 
 
 750 
 5^ 
 
 1300 
 
 6i 
 
 1^25 
 
 4000 
 
 H 
 
 4.00 
 
 1.10 
 
 Outside diameter, mm 65 SO 110 
 
 Each ^30 .35" ^'.SiT 
 
 Mortars, Hard, Acid-proof Stoneware, so-called "Wedgewood," 
 Diameter, inches. . .3-} 3i 4 4-' 
 
 Each ^5 ^40 ^5 ^50 
 
 Diameter, inches.. 8 10 10| 
 
 Each 1 .25 1.50 'i.K^' ' 2.40" 
 
 130^ 150 175 
 
 .65 " .80 1.20 
 I'ith pestles with wooden handle. 
 
 5 Hi 6S 
 
 .60 .70 .85 
 
 Hi i2_i 13 
 
 3.00 3.50 4.10 
 
 By rotation of the miller a large sample of quartz 
 Diameter, inches 6 8 
 
 Mortar, Iron, Buck, for grindioR and amalgamating 
 
 may be ground in contact with quicksilver. 
 
 Each 6.00 9^00 
 
 Motor, Water, for direct attachment to faucet; with SO lbs. pressure will furnish i- H. P. With pulley. 5.00 
 Motor, Water, Rabe, improved construction with 75 mm diameter turbine, and clamp to hold same on 
 
 an ordinary apparatus stand in either a vertical or horizontal position 5,00 
 
 Motor, Water, Rabe, same as No. 40S40 but to screw on table 6.00 
 
 " " " with clamp for vertical apparatus stand so that turbine revolves in a horizontal 
 
 position. Convenient for stirring devices and with clamp to shaft to attach rods and other forms 
 
 of stirrers and with long delivery tube to carry waste water away from apparatus 8.00 
 
ARTHUR H. THOMAS COMPANY 
 
 40852 Motor Hot Air, may be used with eithei g'ls oi akohol diametei ul Mj -wheel G inches, belt pulley Ij 
 inches ; speed about 300 r. p. m. ; consumes 3 cu. ft. of gas per hour. 15.00 
 
 40856. Motor, Hot Air, j^ H. P., similar to No. 40S52 but larger; speed 300 r. p. m. With gas burner. . 35.00 
 
 40860. " " " same as No. 40860 but for gasoline burner 40.00 
 
 40864. Countershaft, for use in power transmission with small laboratory motors; shaft 12 inches long, IJ 
 inches in diameter with pulleys 1, 2, 3 and 4 inches in diameter 1.50 
 
 408ti8. Speed Reducing Gear, for small laboratory motors. Useful for converting the high speed of a motor 
 into a slow, powerful motion. The round plate may be removed and apparatus directly connected 
 to shaft of motor. The fast running pulley is provided with three grooves and the slow with two, 
 thus effecting a wide range of speeds 5.00 
 
 40872. Motor, Hot Air, Heinrici, noiseless, and absolutely safe; for operating with gas burner. Motors of ^V 
 H. P. can be furnished on special order for alcohol burner without increase in price. Motors of 
 the four larger sizes are furnished on special order with either alcohol burner or patent petroleum 
 burner at slightly extra prices. 
 
 Horse Power, appro.i ,/,,■ A- .V tW ^ 
 
 Revolutions per minute 200 200 _180 IfiO 14_0 
 
 Duty Free 22.50 28.80 39.00 ' GO.OO 87.00 
 
 Duty Paid 30.00 38.40 -52.00 84.00 116.00 
 
 40876, Motors, Electric, small ventilating type for operation on either direct or alternating current and either 
 110 or 220 volts circuit, with triple pulleys, f, i^ and -^ inch in diameter. Current and voltage 
 must be specified in ordering. 
 
 Horse Power ;;'j -r, A tV 
 
 Revolutions per minute 1000 1500 2000 3000 
 
 Each, for 110 volts 12..50 12.50 ' 12..50 12.50 
 
 Each for 220 volts 13.50 13.50 13.50 13.50 
 
 40S80. Motor, Electric, for operating on battery circuit, for any voltage up to 8 volts; sii'.e 3| x 4^ x 4^ inches 
 hi ah; weight 3J lbs.; pulley § inch diameter 4.50 
 
 40881. Motor, Electric, with variable speeds, i. e., from 100 to 1800 r. p. m.; without motor. Adjustable to any 
 angle. For use on either 110 or 220 volt circuits. In ordering please specify voltage and whether 
 current is direct or alternating 7.00 
 
ARTHUR 
 
 THOMAS COMPANY 
 
 40888. 
 40892. 
 40896. 
 
 40912. 
 40916. 
 
 40920. 
 40924. 
 
 40932. 
 40936. 
 
 1.00 
 1.00 
 
 Nil. 40920 No. 40928 
 
 Mould, Pouring, of cast iron, with three (.■uiiieal uavitiea 1 iurlie.-; in (.li:uiieter, with wooden handle. 
 
 Mould Pouring, of cast iron, with hemispherical cavities l] inches in diameter, with t' cavities. 
 
 Mufflles, Eattersea, regular form. Dimensions given are outside. 
 
 Number B C D E 
 
 Length, inches Ih 8 S5 9 
 
 Width, inches 4^ A\ 5 5^ 
 
 Height, inches 2g 3 3j 3f 
 
 Each 45 .55 .65" .70 
 
 Muffles, Opaque Fused Silica. 
 
 Length, inches 4^ 7^ 6J 9^ 9^ 15 
 
 Width, inches 2| 3 41 5{- 6J 9i 
 
 Height , inches 2f 3 Z\ 5 44 6i 
 
 Each 1.85 2.50 2.50 
 
 Muffles, Alundum, D shaped. 
 Length, inches . . . 4J 
 W'idth, inches .... 3i 
 
 Height, inches. . . 2 2i 3i 3.; 3^ 4^ 41 4J 
 
 Each 1.75 2.25 3.50 3.25 4.50 6.00 6.50 7.00 
 
 Needle, Innoculating, a i^lass rod with If inches of No. 26 platinum wire fused in end 50 
 
 Needle, Innoculating, same as above but with Z\ inches of No, 24 platinum wire 1.00 
 
 " " KoUe, consisting of a holder entirely of aluminum with a non-conducting inset 
 to prevent extreme end from heating, without platinum loop 80 
 
 Needle, Innoculating, Eolle, new form, with demountable hard rubber handle, without platinum loop 1.20 
 
 Needles, Innoculating, Ravenel, consisting of No. 24 platinum wire securely mounted in an aluminum 
 rod with protecting cover made of a glass tube with one end closed. Furnished either with a 
 
 straight needle or twisted loop. Style Straight Twisted 
 
 Each 80 1.50" " 
 
 Needle, Innoculating, Rosenberger, consisting of a rosewood handle with clamp for conveniently 
 inserting platinum wire 50 
 
 Needle, Innoculating, same as above, but with If inches of No. 26 platinum wire 75 
 
 "Platinid" Wire, as recommended by Neisser for use in innoculating needles because of the present 
 high pri(.'e of iilalinum. Per foot 10 
 
 APPARATUS FOR THE DETERMINATION OF NITROGEN 
 
 1.85 
 
 2.50 
 
 n 
 
 6» 
 
 3i 
 
 5 
 
 _2l 
 
 H 
 
 No 409r0 '^ No. 4l)%S 
 
 Kjeldahl Distilling Apparatus, complete, consisting of No. 40964 Condenser with block tin tubes and 
 Burner .Shelf No. 4096S. With burners but without glass flasks or connecting tubes. 
 
 Number of burners fj 10 
 
 Each 4~2.0"0 60'.00 
 
 Kjeldahl Condenser, only, of copper, with coils of block tin, as shown in Kjeldahl outfit No. 40960, 
 
 Number of coils (i 10 
 
 Each 28.00 42.50 
 
 Kjeldahl Digesting Shelf with burners, with iron support for the necks of the flasks when used for diges- 
 tions. This is identical with the distilling shelf used in outfit No. 409C0. 
 
 Number of burners 6 10 
 
 Each YiM 24.00 
 
 364 
 
ARTHUR H. THOMAS COMPANY 
 
 'fs'^%'%A^ 
 
 40989. 
 40992. 
 
 I* 
 
 4} j> No. 4097fi 
 
 >o. 4099. C 
 
 lillilC 
 
 No. 40984 No. 40988 
 
 Kjeidahl Digesting Shelf, Electric, same as No. 409GS bat with individual electric heaters. Voltage 
 
 must be stated in ordering. Number of heaters 6 10 
 
 Each 40.00 64.00 
 
 Kjeidahl Distiiling Apparatus, improved form, made to bang on the wall. A very convenient apparatus 
 for food chemists in the determination of ammonia and nitrogen. The burners, flasks and receivers 
 are handled from the front and without interference. The burners are adjustable and may be 
 used with natural, illuminating or gasoline gas. Condenser of heavy copper with block tin tubes. 
 With six burners, but without glassware 60.00 
 
 Kjeidahl Distilling Apparatus, same as above but with support to stand on table. With six burners. 
 
 Kjeidahl Distilling Apparatus. Folin Modification, of heavy tinned copper, with quickly removable, 
 adjustable and interchangeable ring supports of both 4 and 5 inch diameter. The copper still 
 proper is bolted between cast iron end brackets by which the entire apparatus is fastened to the 
 
 wall. Number of burners ^ _ 12_ 
 
 Each 35.00 60.00 
 
 Extra Rings 5 inch, Kach 3" 
 
 " 4 " Each 2a 
 
 Kjeidahl Digesting Rack, Folin Modification, which obviates the use of a shelf as the burners and 
 bulb rack are a self-contained unit. Supports for the necks of the flasks are not regularly in- 
 cluded because it is better to allow the necks to rest directly in the lead pipe connected with 
 ventilating tube. Individual supports are furnished extra if desired, 
 
 N umber of burners ^ ^- 
 
 Ea^;!, 15.00 25.00 
 
 Individual Rack Supports for necks of flasks, each -20 
 
 Kjeidahl Digesting Shelf, Johnson, as used in the Connecticut Agricultural Experiment Station. 
 Of heavy cast iron. The flask heaters are 4^ inches apart from center to center and the flasks are 
 supported by placing their necks within the openings in the large lead pipe which should be con- 
 nected with the ventilating system. Each burner is furnished with stopcock and the price mcludes 
 the lead pipe, 4 inches in diameter, on separate stand. 
 
 Number of burners 6 J^ _13_ 
 
 Each 34.00 44.00 50.00 
 
 Kjeidahl Digesting Shelf only as jisted in above outfit; without lead pipe or glassware. 
 
 Number of burners _p_ J^^ _ '^ 
 
 Eacli 24.00 30.00 33.50 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 No. nous No. 41036 No. 41040 
 
 41000. Kjeldahl Distilling Apparatus, new form, with individual condensers, light and portable and offers the 
 advantage of complete adjustment in all directions so that different size flasks and connecting 
 bulbs may be used. Each burner is furnished with a removable protecting shield and condenser 
 jackets are of brass with condensing tubes of heavy block tin. With out glassware. 
 
 Number of condensers 't 6 
 
 Each 30.00 40.00 
 
 41004. Digestion Apparatus, Fumeless, Sy. See Journal of Industrial and Engineering Chemistry. September. 
 1912. \\'ith this apparatus digestions can be made without the use of a fume closet in any place 
 having a water supply and drain. All fumes are disposed of by means of a filter pump and the 
 price includes filter pump, connecting bulb tubes, stand, burners and four 500 cc Jena Kjeldahl 
 
 flasks 15.00 
 
 41008. Kjeldahl Distilling Apparatus for Single Determinations. Convenient where but little work is to be 
 
 done. Complete as illustrated, including glassware 5.00 
 
 41012. Kjeldahl Connecting Bulbs, spherical form, with one curved tip at top. 
 
 iJiameter of bulb, mm 52 _65 
 
 Kach -50 .60 
 
 41016. Kjeldahl Connecting Bulb, Jennings, as used in water analysis. With tubulature in bulb 75 
 
 41020. Kjeldahl Connecting Bulbs, cylindrical form, with two curved tips inside of the bulb. 
 
 Diameter of bulb, mm 45 55 
 
 Length of bulb, mm JHO 120 
 
 Each 65 -75 
 
 41024. Kjeldahl Connecting Bulbs, Hopkins, with single straight tubulation inside of bulb. 
 
 Diameter of bulb, mm 50_ 65 
 
 Each -50" .60 
 
 41028. Nitrogen Bulb, Fresenius 50 
 
 41032. " " Vollhardt 50 
 
 41036. " " " latest form 60 
 
 41040. " " Will-Varentrapp, with three bulbs 35 
 
 41044. " " " " " four " 45 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 No. .11048 
 
 No. 4HISi 
 
 41052. 
 410.5e. 
 41060. 
 
 41088. 
 41092. 
 
 Nitrometer, Dupont, latest moditicntion. For original description see Journal of the Society of Chem- 
 ical Industry, 1900, p. 1S2. As used by the manufacturers of explosives. Glass parts only, with- 
 out support 18.75 
 
 B. Compensating Tube, only 1-75 41076. L. large Iron Supporl inth aix uprights fitted with rings. 
 
 C. Large Measuring Tube, only 4.00 Raeic and pinion movement for levelling bulb, etc. 
 
 D. Nitrogen Bulb Tube, oaly 5.00 Made to order only 50.00 
 
 E. Levelling Reservoir, only 75 Nole — For suitable tubmg for use with above see our No. 
 
 J. Reaction Bulb, only 6,00 46225. 
 
 K. Three-way Tube, only 50 
 
 Nitrometer, Lunge, with rubber tubing, but without support. Capacity. . 50 cc in ^ths. 100 cc in Hbs. 
 
 Each .~ 4;00 ^.50 " 
 
 Nitrometer, Lunge, as used in the determination of nitrogen in gun powder, nitro-glycerine, dynamiti' 
 etc. Graduated from 100 to 140 cc in j^gths, Wiih. rubber connection but without support. 6.00 
 
 Nitrometer, Lunge, same as No. 410S4 but complete with support and clamps 10.00 
 
 " Sthiff, graduated to 100 cc in jths, on support, with reservoir, special clamp and rubber 
 
 tubing 7.00 
 
 41096. Apparatus for the Gasometric Determination of Aliphatic Amino 
 Groups, Van Siylte. See Journal of Biological Chemistry 
 Xn, p. 275, 1911, and XVI, p. 121, 1913. also Abderhalden' s 
 Handbuch der biochemischen Arbeitsmethoden, V, p. 995, and 
 VI, p. 278. The nitrogen gas evolved from amino groups 
 and nitrous acid in the reaction RNHa+HNOs^ROH+HsO 
 -l-Ns is purified and accurately measured in a gas burette. 
 A complete determination of the NHj nitrogen of amino 
 acids requires but six to ten minutes, and the accuracy is 
 equal to that of a Kjeldahl determination. An indefinite 
 number of successive determinations can be performed with- 
 out disconnecting any of the parts. The apparatus permits 
 analysis of any volume of solution up to 10 cc and give 
 results with an accuracy of ^Vth mg. of nitrogen. This 
 method has been applied to varied problems, among which 
 are study of protein digestion, both in vitro and in vivo; 
 the determination of the nature of the amino acids yielded 
 by hydrolysis of small amounts of protein, determination of 
 free amino groups in fixing the constitution of various or- 
 ganic substances; and the determination of amino acid 
 nitrogen in urine, blood and tissues. Complete with glass 
 parts and supports, pulley, shaking device, etc., but with- 
 out motor 25.00 
 
 Extra glass parts 
 11100. Reaction Vessel with filling funnel, burette and three glass stop- 
 cocks 8.75 
 
 11104. Gas Burette, Schellbach, with three-way cock, levelling bulb and 
 
 tubing 4.50 
 
 11108. Gas Pipette, new form, for shaking 1.50 
 
 Note — We recommend our ]\'[otor No. 40884 suitable for 
 connection to house circuit instead of that shown in the 
 illustration which is intended to work on accumulators. 
 
OIL TESTING APPARATUS 
 
 41200. Fire Tester, Elliott, for the flashing point of illumiQating oil, only. With thermometer 
 
 41204. Fire Tester Foster, for the flashing point of illuminating oil only. With thermometer 
 
 41208. Fire Tester, open form, for the flash point of illuminating oil, with thermometer 
 
 41212. Fire Tester, Cleveland open form, small size, complete with thermometer 
 
 il2i(i. " " " " " large model, a most substantial tester. Complete with 
 mnmeter 80° to 640° F., alcohol lamp and Bunsen burner 
 
 11.70 
 13.50 
 5.85 
 9.00 
 
 ther- 
 13.50 
 
 4123(i. 
 4!24(l. 
 41244. 
 
 Flash Point Tester, Abel-Pensky, for petroleum, latest model, 
 with clockwork for opening cover and for depressing the 
 test flame, with certificate of the Kaiserlichen Normal- 
 Eichungs-Kommission; with one standard thermometer 
 10-5.5° C. and one 50-75° C. and aneroid barometer 65.00 
 
 Standard Thermometer only for above, 10-55° C, with metal 
 fitting and P. T. R.certificate 4.50 
 
 Standard Thermometer only for above, 50-75° C, with metal 
 fitting and P. T. R, certificate 4.50 
 
 Flash Point Tester, Abel-Pensky, for both high and low 
 temperatures. This outfit is identical with No. 41220 
 except that the joints of the heating bath are hard brazed 
 and it is supplied with an additional pair of thermometers 
 for high temperatures, i. e. one from 50-160° C for the 
 oi! bath and one from 70-200° C. for the water bath, and 
 is arranged for both gas heating and gas ignition, with 
 certificate of the Kaiserlichen Normal-Eichungs-Kom- 
 mission 80.00 
 
 Thermometer, only, for above, 50-160° C 4.00 
 
 " " 70-200° C 4.00 
 
 Flash Point Tester, Abel-Pensky, for benzene, benzole, etc., 
 with oil cup, similar in arrangement to No. 41220 and 
 with two thermometers - 30 to + 40°C 40.00 
 
 Thermometer only for above - 30 to + 40° C 3.50 
 
41252. Flash Point Tester, Pensky-Martens, for heavy oils, latest model, for gas heatine, with thermometer 
 
 from 80-250° C 45.00 
 
 41256. Thermometer, only, for above, 80-250" C, with P. T. R certificate 6.50 
 
 41260. " " " " 40-160° C, " " " for low temperatures 5.00 
 
 41264. " " " " 200-400" C, " " " " high " 8.00 
 
 41268. Flash Point Tester, Pensky-Martens, for heavy oile, exactly the same as No. 41252 \mt with electric 
 heating and ignition; for either 110 or 220 volt circuit. Voltage must be specified in ordering. 
 With adjustable resistance, connecting cord, socket and switch and one certified thermometer 
 S0-250''C. With this electric heating device the crucible may he heated to 100°C. in seven min- 
 utes and to 400°C. in twenty-five minutes 110.00 
 
 41272. Flash Point Tester, open crucible form, for gas heating and gas ignition; with one thermometer from 
 SO to 2S0° C, porcelain crucible and ndiustable burner 22.50 
 
 / \ 
 
 41276. Flash Point Tester, U. S. Bureau of Mines Model, for low burning oils, complete with three thermom- 
 eters, aneroid barometer, instructions and portable carrying case 135.00 
 
 41280. Flash Point Tester, U. S. Bureau of Mines Model, for high burning oil, with two thermometers and 
 
 instructions, in portable case 120.00 
 
 369 
 
ARTHUR H. THOMAS COMPANY 
 
 fP^Xrf^ 
 
 41284. 
 
 41288. 
 41292. 
 41296. 
 41300. 
 
 41304. 
 41.308. 
 41312. 
 
 41.321). 
 41.324. 
 
 Flash Point Tester, same as No. 41280 but with electric heating, for either 110 or 220 volts. Voltage 
 
 must be specified in ordering; with adjustable resistance, switch, socket and cord 65.00 
 
 Thermometer only for either No. 41280 or No. 41284, 80-280° C 4.50 
 
 " " " " " " " " 180-400" C 5.00 
 
 Porcelain Crucible only for either of above - • .45 
 
 Viscosimeter, Scott. Each instrument is standardized and has stamped upon the handle the time in 
 seconds and fractions of seconds required for 50 cc of distilled water at 70° F. to be discharged. 
 
 Complete with thermometer to 212° F. in single degrees and 50 cc graduated cylinder 15.00 
 
 Thermometer for above, 212° F. in single degrees 1-50 
 
 Thermometer for lubricating oils, 50° to 120° F. in |th degrees 5.00 
 
 Viscosity Pipette, Dudley, delivering 100 cc of distilled water in 35 seconds at a temperature of 
 
 lfi0° F 1.25 
 
 Viscosimeter, Redwood, original English make, for testing the viscosity of oils and as adopted by 
 the British Mineral Oil Association. With certificate of verification by Mr. J. A. Hicks, assist- 
 ant to Sir Boverton Redwood. Complete with thermometers 45.00 
 
 Thermometers for No. 41316, 340 to 300° F. Per pair 6.00 
 
 Leptometer, for the direct comparison of the viscosity of two oils simultaneously and under equal 
 
 conditions 40.00 
 
 Viscosimeter, Stormer, new model. This instrument is constructed upon the principle of rotating a 
 cylinder in the liquid under examination with a constant weight and at a known temperature. 
 A revolution counter is connected and the time required for the cylinder to make a specified 
 number of revolutions in distilled water and the substance under examination form the basis of 
 comparison, or in other words, give a means for determining the viscosity of a liquid, with direc- 
 tions for use 30.00 
 
-Ci 
 
 ^;W-% 
 
 No. 41332 No. 41340 No. 41352 
 
 41332. Viscosimoter, Doolittle Torsion, improved, for measuring the viscosity or fluidity of oils, varnish, 
 starch, glucose, glue, or any fluid whether containing solid particles in suspension or not. See 
 
 Journal of the American Chemical Society, Vol. XV, 1S93, pp. 172 and 145. Complete T.i.OO 
 
 41336. Viscosimeter, Saybolt Universal, original make and design GO.OO 
 
 41340. Viscosimeter, Saybolt Universal, Improved Model, for testing cylinder, valve and similar oils with 
 bath at 21:2'' F and the oil at 210** F, for reduced black oils with oil at 130° F and for testing 
 neutral, spindle, paraffine, red and other distilled oils with oil at 100° F or with oil at any 
 temperature from 70° F to 212° F. The Viscosimeter is now furnished with an electric 
 heating element for either 110 or 220 volt lighting circuit with cord and plug for lamp socket 
 (voltage must be specified in ordering) and is also furnished with the usual gas heating arrange- 
 ment as shown in illustration and also with a U-tube steam heater 75.00 
 
 41344. Extra Flask, graduated, 60 cc capacitv 1.25 
 
 41348. Extra Thermometers, each 1-75 
 
 41352. Viscosimeter, Engier, with gold plated oil cup and platinum outlet tube, two certified thermometers, 
 10-50° C. and 10-150° C, ring burner, tripod and 200 cc certified flask with one mark; with cer- 
 tificate of the_Kaiserlichen Normal-Eichungs-Kommission 38.00 
 
 4135G. Viscosimeter, Engier, for High Temperatures, similar to No. 
 41352 but with hand brazed bath and enclosed steam 
 jacket; with two certified thermometers, 180-300° C and 
 200 cc certified flask with one mark, tripod and ring 
 burner; with certificate of the Kaiserlichen Normal- 
 Eichungs Ivommission 55.00 
 
 413C0. Viscosimeter.Engler, Improved Model, according to the specifi- 
 cations of the Petroleum Congress. This instrument differs 
 from No. 41352 in that the oil bath is totally immersed in 
 the water bath and the lid of the oil bath is doubled walled. 
 The water bath is also provided with astirrerD, The water 
 bath is wider, permitting a more constant temperature and 
 the special device F is provided to control the opening of 
 the outlet tubulation; with two certified thermometers, 
 10-50° C and 10-150° C, 200 cc certified flask with two 
 marks, tripod and ring burner; with certificate of the 
 Kaiserlichen Normal- Eichunga Kommission 46.50 
 
Viscosimeter, Engler, Improved Model for Electric Heating. With two certified thermometers, 10-60° C 
 and 10-150" C, adjustable resistance for maintenance of constant temperature, 200 ec certified 
 flask with two marks, tripod; and certificate of the Kaiserlichen Normal-Eichunga Komraission. 
 Vollage must he specified in ordering 86.25 
 
 Viscosimeter, Engler, Improved Model for High Temperatures, for Electric Heating, with enclosed bath 
 in asbestos jacket, deflamator and outlet stopcock, with two certified thermometers, 100-300° C 
 and 100-350" C, tripod, 200 cc certified flask with two marks and adjustable resistance. With 
 certificate of the Kaiserlichen Normal-Eichungg Kommission. Voltage must be specified in 
 •ordering 101.50 
 
 Viscosimeter, Engler, Improved Model, for Small Quantities. 20 cc of oil is required for the test 
 instead of 200 cc. By this arrangeincnl inurh \uuv is saved in the testing of thick oils by dimin- 
 ishing the time of outflow. Othe'rwif^i' (ln' msl I'limcnt is similar to No. 41360. With 2 certified 
 flasks, one of 200 cc with two markw :iiid mir nf 'JD cc with one mark; with support, tripod, gas 
 burner and 2 certified thermometers, 10-50' e' ;iiid 10-150° C. With certificate of the Kaiserlichen 
 Normal-Eichungs Kommission 70.00 
 
 Viscosimeter, Engler, for Electric Heating. Otherwise as above, with adjustable resistance, and cer- 
 llfi(':;te of the Kaiserlirhen Norriial-Eichuncs Kommission. Voltnge must be specified in order- 
 '"U 109.50 
 
 41.^80. Viscosimeter, Ubbelohde, for Illuminating Oils, for the testing of 
 which tho regular Engler Viscosimeter is not well adapted. 
 The oil cup is wider and the same is provided with an over- 
 flow tube for bringing the oil to the correct height and the out- 
 let tulie is of greater length and of smaller diameter than for 
 liibricaiing oils; with two certified thermometers 50° and 100° 
 C, 100 cc certified flask with one mark, gas burner and 
 tripod 34.50 
 
 41384. Viscosimeter, Ubbelohde, for Illuminating Oils, for Electric Heating. 
 Otherwise as above. With adjustable resistance. Voltage 
 must be specified in ordering 74.25 
 
 41.5S8, Viscosimeter, Ubbelohde, for Cylinder Oils. This is similar in con- 
 struction tn the Petroleum Viscosimeter No. 413S0 but the 
 
 jnint:- ■■,■,. i,.-,.,| hrnzod fnr hiirli I i"'ini)oratures and the water 
 io'-' ■ ■ ■ II ' '.' 1 I'l ,L--1".stns Mini fiicnished with cover and 
 Pii; i\ ■■ \'. I I iv,r. r>-r(ilirH Tliermometers, 100-300" C 
 an-l l"^iJ :iii(i ( , 'ii, 'L-Kring [hisk ii)(i cc with one mark, tripod 
 
 and ring burner 47.50 
 
 41392, Viscosimeter, Ubbelohde, for Cylinder Oils, for Electric Heating. 
 Otherwise as above. With adjustable resistance. Voltage 
 must lie sprrifird in ordering 86.75 
 
 '^~^A iS^j^ 
 
41396. Tables, Ubbelohde, for use with Engler's Uibi-U'iiting oil Viscosimeters. The use of these tables 
 dispenses with all calculations and gives direct readings in Engler degrees for the outflow periods 
 of both 50 cc and 100 cc. They reduce the time of making tests to about Ith that required with- 
 out the use of the tables. See "Handbuch der Chemie und Technologie der Oele und Fetle." 
 
 Each 1.50 
 
 41400. Apparatus for the Distillation of Mineral Oils, Engler, consisting of a nickel plated receptacle for the 
 mineral oil, on stand with burner and cover; with condenser with support, measuring flasks, and 
 two burettes with stand; all packed in two portable wooden cases. With P. T. R. certificate for 
 
 both the apparatus and the glassware. Duty Paid 107.00 
 
 41404, Oil Testing Machine, Thurston. The journal of this tester is l^- inches in diameter by 1§ inches long. 
 
 The friction is measured on a graduated circular arc by motion of pendulum over same 160,00 
 
 41408. Oil Testing Machine, Thurston, as above, with countershaft 190.00 
 
 41412. Molecular Weight Determination Apparatus, Schimmel, as used for determining the solidification 
 point of essential oils. Complete with special thermometer from —20 to +40° C. in ^°.. . 6.50 
 
 4141G. Thermometer, only, for above apparatus, —20 to +40° C. in ^-° 2.50 
 
 41420. Thermometer, for Engler and Ubbelohde Viscosimeters, 10-50" C. with P. T. R, certificate 3.00 
 
 41424. " " " " " " 10-150° C. " " " .... 4.00 
 
 41428. " " " " " " 10-200° C. " " " .... 5.00 
 
 41432. " " " " " " 180-300° C. " " " .... 7.00 
 
 41436. " " " " " " 10-300° C. " " " .... 8.00 
 
 41440. " " " " " " 100-300° C. " " " .... 7.50 
 
 41444. " " " " " " 100-350° C. " " " .... 8.00 
 
 41448. Flask, Engler, 200 cc, with one mark, usual form, as shown in iilustrations of No. 41332 and No. 41356; 
 
 without certificate 2.25 
 
 41452. Flask, Engler, as above with P. T. R. certificate 3.75 
 
 41456. " Engler, 200 cc, with two bulbs and two marks, as shown in illustration of No. 41360, etc.; with- 
 out certificate 2.75. 
 
 41460. Flask, Engler, as above, with P. T. R. certificate 4.75 
 
 41464. " " 20 cc with one mark, as used with No. 41372, without certificate 2.00 
 
 41468. " " " " " " " " " " " with P. T. R. certificate 3.50 
 
ARTHUR H. THOMAS COMPANY 
 
 a D 
 
 — *i 
 
 tra sheet iron bottom to pre- 
 1x12 12x16 
 
 415 Hi. 
 41520. 
 
 Oven, Single Wall, »t hea\\ sheft opper jn wi ju^ht iron a 
 vent burning out. With perforated shelf. 
 
 Inside dimensions, inches 6 x S 8 x lU 
 
 Each 5.00 ~f.W 
 
 Oven, Single Wall, exactly same as No. 41500 but with enclosed sheet iron base. 
 
 Inside dimensions, inches 6x8 8 x 10 
 
 Each 6.00 ' 8.00 
 
 Oven, Double Wall, providing space for water jacket. Otherwise 
 
 Inside dimensions, inches 5| x of 
 
 Each 8.00 
 
 Oven, Double Wall, exactly same aa No. 41508 but with enclosed sheet iron base, 
 
 IiisLilc iliiiiensions, inches 5j x 5| 
 
 Each 9.00 
 
 Cylindrical Rings on top so that oven may be used as a water bath. For all size; 
 
 Steam Coil for heating water in the jacket of 41508 and 41512 by direct connection with steam 
 For all sizes. Extra 
 
 10 xj^ 
 12:00 
 
 No. 41500. 
 
 10.00 
 
 11.00 
 Extra. 
 
 J2x^ 
 18.00 
 
 9ix9f 
 14.00 
 
 9ix9f 
 15.00 
 ... 1.50 
 supply. 
 . . 18.00 
 
 41.524. 
 
 41.528. 
 
 Oven, Rammelsberg, cylindrical form, of polished copper, 13 in. high x 5 in. diameter 3.a0 
 
 Oven, Double Wall, Wiesnegg original French make. Inside chamber is of heavy, solid porcelain in 
 one piece, with porcelain shelves. The inside porcelain frame fits tight aj^ainst the plate glass 
 door so that no corrosive parts are exposed to the inside of the chamber. As supplied by us to the 
 ir. S. Department of Agriculture, Bureau of Chemistry, Food Inspection Laboratories. Inside 
 dimensions 29 x 25 x 24 cm. With adjustable burner. 
 Duty Free 33.00 Stock 50.00 
 
 Oven, Single Wall, of heavy asbestos wood, set in inetat frame. A removable sheet metal plate forma 
 the bottom of the oven. The rack for the shelves and frame of the door are of cast aluminum, 
 being non-corrosive. With perforated asbestos shelves adjustable to any height. For either gas 
 or electric heating. For Gas Heating. ,-,,c ,., ,, 
 
 Inside dimensions, inches 10 x 10_x 12 18 x 12 x 14 
 
 Each 16-50 22.50 
 
 Oven, Single Wall, for Electric heating, otherwise exactly as above 25.00 35.00 
 
ARTHUR H. THOMAS COM P A N Y 
 
 ,^^ 
 
 41540. Oven, Kaehler, Single Wall, of sheet iron covered with asbestos. The heat is distriljiitpJ uvenly 
 throughout the interior chamber by means of tubes from the dome over the burner. Inside 
 dimensions 30 x 30 x 45 cm 40.00 
 
 41544. Oven, Lothar Meyer, consisting of three cylindrical walls with ventilation for hot air and with top 
 and bottom insulated with infusorial earth. The inner cylindrical compartment may be removed. 
 On stand with ring burner. Size 20 x 30 cm. Of iron 20.00 
 
 41546. Oven, Lothar Meyer, as above, but of copper 32.00 
 
 41550. Oven, Drying, Single Wall, of copper throughout with asbestos covering. Size 10 x 8 x 8 inches. As 
 used by the Barrett Mfg. Co. for their tar and pitch testing in connection with their special 
 apparatus for this purpose 19.00 
 
 41554. Oven, Double Wall, High Temperature. Can be used up to 120° C. when glycerine, toluol or other 
 high boiling point material is used in the jacket instead of water. With water gauge and ventilating 
 system, 20 x 25 x 18 cm 30.00 
 
 41558. Oven, Double Wall, High Temperature, for temperatures up to 300° C. when filled with oil or other 
 material of high boiling point. Inside dimensions 15 x 15 x 15 cm. On stand not shown in cut, 17.00 
 
 41562. Over, Double Wall, Abati, Constant High Temperature. With xylol used in the jacket a constant 
 temperature of 136° C. can be attained and with mixture of xylol and cumol, 150° C. With heating 
 bulb and spherical condenser, but without thermometer or burner. Inside dimensions 6x6x8 inches 
 Duty Free 26.40 Duty Paid 32,00 
 
 41564. Oven, Drying, Single Wall, lined throughout with white, acid resisting enamel, with stand and alum- 
 inum shelf not shown in illustration. 
 
 Inside dimensions, cm ^0 x 15 x 15 35 x 25 x 25 
 
 Each 7.50' ~ 12.50 
 
ARTHUR H. THOMAS COMPANY 
 
 1 •.-■'*'■•■*' ^ 
 
 Oven, Single Wall, Kaehler, of polished eoppiir, with double bottom providing a circulation system 
 and a constant temperature. Inside dimensions 10 x 10 x 12 inches - - . 25.00 
 
 Oven, Electric, Sargent Patent, with automatic temperature control. Of asbestos material with metal 
 trimmings. Temperature can be set at any point between 70" C. and 150° C. and will be main- 
 tained to within about 1° C. Heating units are easily replaceable. Plug is attached to ordinary 
 larapsocketoneither 110 or 220 volt current. Voltage must be specified in ordering. Inside dimen- 
 sions 10 X 10 X 12 inches. Complete with cord, plug, thermometer and directions 25.00 
 
 Oven, Double Wall, for Steam Heating by direct connection with steam supply. Consisting of four 
 drying compartments 8 x 10 inches, with massive brass doors; surmounted by a copper water 
 bath carrying 5 sets of rings. The inside of the apparatus is made of zinc lined copper and dis- 
 tilled water can be used after being drawn off. 
 Duty Free 105.60 Duty Paid 128.00 
 
 fe^^a 
 
 Oven, Double Wall, for Steam Heating by direct connection with steam supply. Made of cop))cr, with 
 massive brass doors and inside compartments zinc lined. With safety valve and cock under- 
 neath for emptying. Compartments are each 10 x 8 x 8 inches inside. 
 
 Number of compartments __2 3_ 
 
 Duty Free 41.25 59.40 
 
 Duty Paid 50.00 72.00 
 
 Oven, Double Wall, for Steam Heating by direct connection with steam supply. Of copper with 
 copper steam coils, water gauge, double doors and asbestos covering. 
 
 Size, cm 15 x 25 x 15 20 x 30 x 20 _25 x_40 x 25 30 x 50 x 30 
 
 Duty Free ~ 19.80' 26.40 45.00 67.50 
 
 Duty Paid 26.40 35.20 60.00 90.00 
 
41684. Oven, Electric, with automatic expanding disc temperature regulator and magnetic circuit breaker. 
 Of heavy asbestos board mounted in solid brass frame, giving a durable and rigid construction. 
 Heating units are wound on hard porcelain and are easily replaceable, as is the expanding disc. 
 The temperature control will regulate within 1° or 2° C. over long periods of time and is recom- 
 mended as a thoroughly practical and satisfactory utensil which we have supplied to many impor- 
 tant laboratories. Works equally well on direct or alternating current. Inside dimensions 
 16 X 10 X 9 inches. As regularly sent out the expanding disc will regulate from 75° C. to 160° C. 
 Special windings of heating units and special capsules for other ranges of temperature, when 
 desired. With diagram of connections and full information for operating. 
 
 For voltafj;e 1 10 220 
 
 Each "70.00 72.00 
 
 OVENS, FREAS PATENT ELECTRIC, with temperature control, as approved by the National Board of Fire 
 Underwriters. May be set for any temperature desired from a degree or so above room temperatures 
 to 175° C. Made of heavy, fire-proof asbestos wood which is not attacked by acids or alkalies. The 
 temperature indicator is set at the temperature desired by turning the milled head as shown in illus- 
 tration. The metal fittings of door, base, etc., are of aluminum. When ordering please state voltage 
 and current of circuit on which oven is to be operated. 
 41688. Oven, Freas Patent Electric No. 100. Size of chamber 12 x 12 x 12 inches. Mounted on cast iron 
 base for placing on table. Complete with flexible cord and plug to attach to regular lighting 
 circuit 75.00 
 
 41692. Oven, Freas Patent Electric No. 110. Inside dimensions 14 x 17 x 18 inches. Mounted on heavy iron 
 base with legs, total height 5 ft. Complete with flexible cord and plug 165.00 
 
 41696. Oven, Freas Patent Electric No. 114, same as No. 110 but graduated for temperatures up to 500° F. 
 " ■ --.ed in the evaporating tests of asphalt, etc 175.00 
 
 41700. Oven, Hearson Electric, specially designed 
 for rapidly ascertaining the percent- 
 age of moisture in flour, tobacco, 
 
 seeds 
 is reguhifU- ^f-'ii 
 115° C. bni ium; 
 0. to 150" C. 
 compartment is m 
 i over the t 
 
 erial. The oven 
 >iii for operation at 
 "■ ;:(i,iusted from 15° 
 lie :iir in the inner 
 -lifoniily lulled and 
 ■■lyy colli :iining the 
 samples to be testrd, takiiit; up in its 
 passage the moisture which is driven 
 off, the whole being discharged 
 through outlets at the back of the 
 apparatus; with Hearson' Patent 
 Capsule by means of which tempera- 
 ture variation may be kept to within 
 1° C. Inside dimensions 6 x 11 x 11 
 inches. Complete with thermostat, 
 capsule, thermometer, two shelves, 
 eight trays, wall plug and 3 ft. of 
 flexible cord. Please specify voltage 
 in ordering. 
 
 Duty Free 100.80 
 
 Duty Paid 151.20 
 
ARTHUR H. THOMAS COMPANY 
 
 41704. Oven, Hearson Electric, similar in construction to above but specially arranged for testing tobacco. 
 I uiiipletp with thermostat, capsule, thermometer, two perforated shelves, wall plug and 3 ft. of 
 flexible cord. Please specify voltage in ordering. 
 
 Duty Free 100.80 Duty Paid 151.20 
 
 OVENS, DESPATCH, ELECTRIC. This series of Ovens is constructed of polished steel with nickel plated angle 
 iron corner fittings and walls of asbestos from 1 to 2 inches apart, depending upon the size of the oven, 
 packed with mineral wool. They have open wire heating units guaranteed not to burn out or crack. The 
 alloy from which this wire is made does not oxidize at high temperatures or become brittle with repeated 
 heating .and cooling. These Ovena are provided with ventilators at both top and bottom designed espe- 
 cially for the carrying off of moisture, as in drying out of samples, thus expediting the drying procc'ss 
 and enabling a very accurate temperature control without the use of a thermostat or other regulating 
 device. The ovens are all provided with a three-heat switch and by adjustment of the ventilator the 
 temperature can be maintained from 90° to 100° C. on the low point, 100" to 108° C. on the middle point 
 and 140° to 150° C. on the high point, 150°C. being the highest temperature for which they are regularly 
 built. The current consumption is exceedingly small, as will be noted from the data given below. 
 These Ovens are widely used in the moisture test of soils, etc., Pekar slick tests in flour and baking labo- 
 ratories and for testing sulphite in pulp mills as to moisture. The Ovens operate equally well on direct 
 or alternating current but voltage must be specified in ordering. 
 41708. Oven, Despatch, Electric, as above described, with glass window for observation of the material dur- 
 ing drying, with drying space 16 x 7 x S inches; current consumption 75-150-300 Watts. . , . 32.00 
 41712, Ovens, Despatch, Electric, as above, with removable shelves and thermometer. 
 
 Inside dimensions, inches 13 \ 12 x IS 12 x 9 x 16 11 x 6 x 10 
 
 Number of shelves 4 3 2 
 
 Continuous current consumption, Watts. 150 100 100 
 
 Each 85.00 80.00 75.00 
 
 41716. Ovens, Despatch, Electric, Compartment, specially designed for moisture test of soils. 
 
 Inside dimensions of each compartment, inches 20 x 16 x IS 20 x 60 x 18 
 
 Number of compartments 2 3 
 
 Maximum current consumption of each compartment, Watts 150 150 
 
 Each 175.00 215.00 
 
 41720, Oven, Despatch, Electric, Triple Compartment, as above, specially designed for sulphite test in pulp 
 mills. Inside dimensions of each compartment 14x9x20 inches, current consumption of each 
 compartment 100 Watts. .. 215.00 
 
 378 
 
ARTHUR H. THOMAS COMPANY 
 
 <S^J.' 
 
 Oven, Double Wall, Biair, of cupper, on sliuct iron base. As usud in iron analysis; 24 melius ioiiji x 7 
 inches high and 7 inches deep. With four compartments 4j x 6 x 24 inches, with constant water 
 level. Each compartment is supplied with a copper box 4 x 4f x H inches, with serial number. 40.00 
 
 Oven, Single Wall, for Vacuum, Carr. Inside dimensions 12 x S inches, with copper shelf, vacuum 
 gauge and openings for thermometer and thermostat. Made of heavy brass, with tightly clamp- 
 ing door. See Wiley's "Agricultural Products," Vol. Ill, p. S3 65.00 
 
 Oven, Double Wall, for Vacuum, for either steam or gas heating, inside dimensions 16 inches long 
 by 8 inches in diameter. These ovens are widely used in various laboratories of the U. S. 
 Department of Agriculture, sugar laboratories, etc., and are of robust and substantial construc- 
 tion intended for continuous operation in vacuum work. The body of the oven is a large cylin- 
 drical brass tube surrounded by 1 inch steam space or jacket built to withstand 40 lbs. pressure. 
 The oven is provided with two perforated pipe burners for gas heating and a constant level for 
 the water in the jacket is placed in the rear. Suitable openings for exhaust of air and moisture 
 from the chamber, thermometer and vacuum gauge are provided 175.00 
 
 Oven, Double Wall, cylindricnl form, for 
 drying in current of hydrogen etc. 
 Substantially made, of heavy copper 
 and provided with one shelf. Inside 
 dimensions 17 x 6f inches. May also be 
 used with glycerine or toluol in jacket 
 and for temporary vacuums up to 
 about 20 inches of mercury but not for 
 high or continuous vacuum .... 40.00 
 
 41740. Oven, Freas Patent Electric for Vacuum. 
 
 Inside dimensions of vacuum chamber 
 8x8 X 18 inches. Temperature rfinge 
 up to ISO" C 250.00 
 

 41714. Oven, Drying. Alsop. DcKi^ni'il fur aiidwidely used in fanning labnrat(i]-ie^. Will ;LC(.>oitiniod.ate 110 No. 
 
 261)1- crystallizing dishes. Qi heavy copper with condenser at side fo supply distilled water. 
 
 With steam outlet at top. Size 35 x 25 inches. For gas heating 135.00 
 
 41748. Oven, Drying, Alsop, same as above but with coil for steam heating 140.00 
 
 41752. Oven, for Vacuum. Sidersky, improved model, consisting of a double walled chamber with heavy metal 
 
 dour with plane glass inset. Inside dimensions 260 x 300 nun. 
 
 Duty Free Bfi.Ofl Duty Paid 80.00 
 
 41756. Oven, Soxhlet, of polished copper, improved model with eight tubes, ball condenser, draft chim- 
 ney and tray with five nickel dishes. Drying chamber is 50 x 100 x Sj cm. The tubes supply- 
 ing beat to tlu: chamber lie in a bath which is filled with a high boiling point material such as 
 salt Kolotiiiii, glycerine, toluol, etc., according to the temperature desired. As used in the rapid 
 deter]i]iri;Ltiori of total solids in milk and other experiments. 
 Duty Free 36.30 Duty Paid 45.00 
 
 41760. Oven, Vacuum, of heavy cast brass. With glass door, and interior lined with zinc. Inside dimensions 
 25 X 25 X 25 cm. 
 Duty Free 90.75 Duty Paid 110.00 
 
41780. Ov. 
 
 Oven, Double Wall, for Vacuum, for gas heating, cylindrical form. Space iaetwecn the walls may be tilled 
 with glycerine, toluol, etc., when high temperatures are required. Of heavy copper, tinned on 
 inside. Inside dimensions 95 x 405 mm. With vacuum gauge and ball condenser but without 
 burner. 
 Duty Free 40.00 Stock 45.00 
 
 417(>8. Oven, Double Wall, for Vacuum, as above, but for indirect steam heating with valves and connections. 
 Duty Free 45.00 Duty Paid 60.00 
 
 41772. Oven, Double Wall, for Vacuum, cylindrical form, with heavy plate glass at each end and door fastened 
 by clamps. With thermometer in metal mounting, manometer, reflux condenser and two remov- 
 able shelves. For gas heating. Size 180x410 mm. 
 Duty Free 66.00 Duty Paid 88.00 
 
 41776. Oven, Double Wall, for Vacuum, of the same general construction as No. 41772 but extra large size, 
 i. e., 600 X 300 mm inside dimensions. Massive construction with heavy plate glass at each end. 
 May be fitted for direct steam heating without extra cost. With gauge and reflux condenser. 
 Duty Free 12.5.25 Duty Paid 155.00 
 
 1, Vacuum, Hearson Electric. 
 
 This apparatus consists of an 
 inner cylindrical chamber, the ex- 
 posed end of which is furnished 
 with a loose cover which can be 
 clamped to this end of it in order to 
 hermetically close it when it is de- 
 sired to exhaust the air. 
 
 The inner cylinder is surround- 
 ed by another cylinder of larger 
 capacity, which is filled with par- 
 ailine (not oil). In the space be- 
 tween the two vessels there is also, 
 coiled around the inner cylinder, a 
 long fine copper tube one end of 
 which terminates in the inner 
 cylinder, whilst the other end is 
 furnished with a small valve which 
 will be found on the left-hand side 
 below the apparatus. Another 
 small tube connected with and 
 terminating in the inner cylinder 
 will be found on the right-hand 
 side also below the apparatus. 
 
 The regulator and the ther- 
 mometer both dip into the vessel 
 of molten paraffine in which the 
 inner vessel and copper tube are 
 both also submerged. It will be 
 found in practice that the inside 
 No. 41780 temperature indicated by_ self-reg- 
 istering thermometers, is about 
 above that shown on the scale of the thermometer outside when the inside is at 
 i Fah,, allowance can be made accordingly if considered necessary. 
 The asbestos gaskets which serve to lute the cover should be painted frequently with black- 
 lead mixed with turpentine. Air admitted to the inner cylinder through the small valve on the 
 left is compelled to traverse the long length of copper tube before reaching the cylinder into 
 which it is admitted at the back at practically the same temperature as that already in the interior. 
 When the desired temperature is reached the electrical energy required to maintain it is onlv 
 60 Watts. 
 Duty Free 113.40 Duty Paid 170.10 
 
 3 degret 
 
T^ 
 
 :^3S) 
 
 42000. Paper, highly glazed on one aide. Convenient tnr culli riin^ III Lit ;i.sh, etc. in white, black, blue and 
 yellow. Color must be specified in crdeiint!,. yhuct.s 'M x 2i inches. Per quire 25 
 
 42004, Paper, Parchment, for dialysers, etc., medium weight, in sheets 375 x 250 mm. Per sheet 10 
 
 42008. " " extra heavy, particularly selected for and used by the leading Antitoxin Labora- 
 tories for filtering antitoxin, serum, etc. Recommended as being the only thoroughly satisfac- 
 tory paper for this purpose. In sheets 66 x 100 cm. Per sheet 30 
 
 42012. Pencil Litmus, Tyree, consisting of a red and a blue litmus pencil in metal case 25 
 
 42016. Pencils, Wax, best imported quality, for writing on glass, china, metal, etc. Selected especially for 
 laboratory use and found highly satisfactory for this purpose. In white, blue, red and yellow. 
 Color must be specified in ordering. Each .10 
 
 42020. Pencils, Wax, with the wax enclosed in hard rolled paper iustead of wood. In white, blue, red or 
 yellow. Please specify color in ordering. Each 12 
 
 42024, Percolators, conical shape of blown glass. 
 
 Capacity I pt, _ _ 1 pt. 2 pt. -j- gal . 
 
 Each V40 ^5 ^0 J0~~ 
 
 42028. Percolators, cylindrical or Oldberg's shape, of blown glass. 
 
 Capacity 5 pt. 1 pt. 2 pt. 
 
 Each 40 " .45 .60 
 
 42032. Percolators, with tubulation to iit i inch rubber tubing. 
 
 Capacity 2 pt. 
 
 Each .50 
 
 42036. Percolator Bottle, graduated in ee. Capacity, cc 500 
 
 Each "■ 
 
 1.00 
 
 1 sal. 
 
 2 gal. 
 
 3 gal. 
 
 .5 gal. 
 
 1,00 
 
 igal. 
 
 2,00 
 
 Igal. 
 
 3,25 
 
 2 gal. 
 
 6.00 
 
 3 gal. 
 
 1.00 
 
 Ipt. 
 
 1.50 
 
 4 gal. 
 
 3,25 
 
 1 gal. 
 
 4.00 
 
 2 gal. 
 
 ,60 
 1000 
 
 .80 
 2000 
 
 1,10 
 
 4000 
 
 2.25 
 8000 
 
 1,10 
 
 1,65 
 
 2,85 
 
 4.35 
 
ARTHUR H. THOMAS COMPANY 
 
 PHOTOMETERS 
 420411. Photometer, Weber Portable, Opal Glass Plate Type, with Lammer-Brodhun 
 
 prism, for comparison by similarity; with benzene lamp and Prof. Web- '*"'>' ^^^^ l*"iv Paid 
 
 er's table of constants. Complete in portable case 120.00 160.00 
 
 42044. Photometer, as above, but for comparison by both similarity and contrast . . . 127.50 170.00 
 
 Accessories for Weber Photometer Nos. 42040 and 42044. 
 42048. Standard Incandescent Lamp for 2 volts for use with above, inter- 
 changeable with benzene lamp, in mounting 21 .00 28.00 
 
 42052. Reflecting Mirror Attachment, to be put on in place of tube ''K" 9.00 12,00 
 
 42056. Table of Constants for the mirror attachment 3.00 4.00 
 
 42060. Adjustable Laboratory Tripod, for either of above Photometers 3.60 4.80 
 
 42064. Photometer, Weber, Improved Tube Form, latest construction with Lummer-Brod- 
 
 hun prism, for comparison by both similarity and contrast, with adjustable 
 opal glass plate in the tube, diaphragm arrangement, but without peroontag'^ 
 graduation, standard lamp, plate box or receiving screen. See Zeils'-hrift 
 fur Instruinentenkunde XXVII Jahrgaiig, Juni 1907. {Copy of reprint sent 
 
 on request) 159.00 212.00 
 
 Accessories for No, 42064 Weber Photometer. 
 
 42065. Percentage Graduation on above 4.50 6.00 
 
 42072. Standard 2 Volt Lamp, in adjustable mounting as shown in No. 42064 21.00 28.00 
 
 4207G. " Benzene Lamp, in adjustable mounting as shown in No. 42040 27.00 36.00 
 
 42080. Plate Box. for plates fi and m, for the decimal extension of the range, etc. See 
 
 Zeitschrifl fur Instrumentenkunde , XXVII Jahrgang, Juni 1907 43.50 58.00 
 
 42084. Gvpsum Plate, Gi 7.20 9.60 
 
 42088. Plate Box, Weber model 15.00 20.00 
 
 42092. " " " " with divided scale and pointer 19.50 26,00 
 
 42096 Table of Constants for either of the above plate boxes 7.50 10.00 
 
 42100. Two Smoked Glasses in mounting, fitting in either of above plate boxes. . . 7.50 10.00 
 
 42104. Box for Smoked Glasses, to be used in place of Weber box 10.50 14.00 
 
 42108. Improved Plate /j., for use in connection with Weber's plate box or the box 
 
 for smoked glasses 7.20 9,60 
 
 42112. Screen ^ 1 15.00 20.00 
 
 42116. Spherical Receiving Screen 27.00 36 00 
 
 42120. Case for complete instrument _. _. 12.00 IS.OO 
 
 Note— As a comprehensive outfit for the measurement of illumination and inten- 
 sities, either in the open or in enclosed spaces, the makers recommend an 
 outfit consisting of Nos, 42064, 4206S, 42072, 42092, 42096, 42104, 421 12 and 42120 249.00 332.C0 
 
 Note — For Weston precision millivolt and amraetersfor use with the above see p. 201. 
 
42124- Photometer Bench, Stationery, latest construction, consisting of optical bench on Duly Free 
 three cast iron standards, with scale divided in millimeters from to 2500 mm 
 and with three adjustable riders I, II and III, but without standard lamp, N, 
 
 sight-box P or gas burner L 145.50 
 
 Accessories for above Photometer Bench. 
 
 42128. Graduations in Direct Candle Power, extra 15.00 
 
 421.32. Scale, divided from 20 to 3000 mm, extra 10.50 
 
 42136. Set of Six Screens, for above Photometer, consisting of four with circular 
 
 opening and two without opening 43.20 
 
 42T40. Illuminating Device for readmg the scale,, consisting of a small 2 volt Osram lamp 
 
 arranged to illuminate only the portion of the scale to be read 10.80 
 
 42144. Holder for the Suspended Lamp, to fit on the optical bench, with 1 meter of con- 
 necting cord 7.20 
 
 42148. Holder for Incandescent Lamp, to hold the lamp to be tested in both vertical and 
 
 horizontal position 30.00 
 
 42152. Rotator for Incandescent Lamp, without motor 31 .50 
 
 42151). 
 
 42IliO. 
 
 42168. 
 42172. 
 
 42174. 
 42176. 
 
 Duty Free 
 
 Photometer Sight-box, Lummer-Brodhun, for comparison by similarity 40.50 
 
 Photometer Sight-box, Lummer-Brodhun, for comparison by both similarity and 
 
 contrast 46.50 
 
 Photometer Sight-box, Lummer-Brodhun, for measuring of light sources from dif- 
 ferent angles and with a crossline scale for sighting and concave lens for the 
 ocular 60.00 
 
 Photometer Sight-box, Flicker type, including motor for 110 volts. See Zeitschriji 
 
 fur Inntrumentenkunde, Februar 1905 48.00 
 
 Photometer Sight-box, same as above, but adjustable for use through an arc of 180° 
 
 See Zeitschriji fur Instrumenienkunde, Aiigusi 1905 55.50 
 
 Adjustment for above, with horizontal graduations 7.50 
 
 Photometer, Sight-box, same as No. 4216S but reversible, with vertical circle and en- 
 closed adjusting arrangement with horizontal circle 64.50 
 
 Photometer Sight-box, same arrangement as in No. 42176 but for use through an arc 
 
 of 180° 72.00 
 
 20.00 
 14.00 
 
 40.00 
 42.00 
 
 74.00 
 10.00 
 
ARTHUR H. THOMAS COMPANY 
 
 42188. 
 42192. 
 
 42196. 
 42200. 
 
 No. 42212 
 
 Illuminometer, or Relative Photometer, Martens, with benzene standard lamp and 
 table of constants. See Schilling's Journal far Gasbeleuchtung und Wusser- 
 versorgung 1905 
 
 Illuminometer, Martens, as above, including a standard Osram lamp, but without 
 accumulator or ammeter '_ 
 
 Additional Equipment, for above, arranged according to Dinesaen for the measure- 
 ment of illumination on the street, etc., consisting of a 3 cell Edison 
 accumulator, Type F t, two resistances, 1.7 ohms to 7 amperes and .4 ohms 
 to 15 amperes, carrying case and two wooden boxes for the accumulators 
 and the photometer, but not including photometer No. 42184 itself or ammeter. 
 
 Precision Amperemeter, type W. K. a; from 0.7 to 1.2 amperes, for use with above. . . 
 
 Relative Photometer, Weber, particularly recommended for the determination of 
 illuminating values on school desks, work tables, etc. See Schriften des 
 NaturwissenschaJtUchen Vereins fiir Sckleswig-Holstein, Band XV Heft 1... . 
 Extra for certificate and test curve by Prof. Weber 
 
 Standard Incandescent Osram Photometer Lamps. 
 
 45.00 60.00 
 
 30.00 40.00 
 
 90.00 
 7.50 
 
 120.00 
 10.00 
 
 Type 
 
 Hefner Candles 
 
 Color 
 
 Amperes 
 
 Volts 
 
 Lamp resistence in ohms. 
 Watts per Hefner Candle, 
 Cells necessary 1 red. . . 
 
 for operation J white... 
 
 Duty Free L50 
 
 Duty Paid 2.00 
 
 E 
 1 
 
 red 
 
 1.2 
 
 4 
 
 3.3 
 
 4.8 
 
 3 
 
 1 
 
 white 
 1.0 
 
 2 
 
 1.20 
 1.60 
 
 1.50 
 2.00 
 
 E B 
 
 5 10 
 
 white red 
 
 1..5 2.4 
 
 C 10 
 
 4.0 4.2 
 
 1.50 1.95 
 2.00 2.60 
 
 C A 
 
 10 16 
 
 white red 
 
 2.,S 2.6 
 
 6 11,5 
 
 2.1 4.4 
 
 1.7 1.9 
 
 6 
 
 4 
 
 1.95 1.95 
 2.60 2.60 
 
 42208. 
 42212. 
 42216. 
 42220. 
 42224. 
 
 Precision Mounting for Standard Incandescent Osram lamps 
 
 Standard Hefner Lamp, with flame measuring device and sighting arrangement. 
 
 " " " as above, with P. T. R. certificate 
 
 " " " with flame measuring device after Kruss 
 
 " " " as above, with P. T. R. certificate 
 
 F B A 
 
 16 20 25 
 
 white white white 
 
 3 2.7 2.8 
 
 S 12 13.5 
 
 2.7 4.5 4,8 
 
 1.5 1.6 1.5 
 
 1.95 2.25 2.25 
 
 2.60 3.00 3.00 
 
 Duly Free Duly Paid 
 
 6.00 8.00 
 
 12.60 16.80 
 
 13.50 18.00 
 
 13.50 18.00 
 
 14.40 19.20 
 
ARTHUR H. THOMAS COMPANY 
 
 42232. 
 42236. 
 42240. 
 42244. 
 
 422.^6. 
 422(i0. 
 
 422r,0 
 
 Duly Free Duty Paid 
 
 Polarisation Photometer. Martens, for white li^ht on stand as si "11 I t" 89.40 119.20 
 
 " without stand 38.40 51.20 
 
 Stand only for abovt; Photometer 51.00 68.00 
 
 Case " " " " 2.10 2.80 
 
 Comparison Lamp for above; very important for min 
 
 fiuorfsiTMue, etc., consisting of a small Osram lamp t r 1 
 
 fil;iss; screen and mounting for immediate attachment to t 22.50 30.00 
 
 Illumination Tester, Thorner, in box as shown in illustration 
 Rundschau 1904, ^f- !S. and Gesundheils-Ingenienr Z 
 gesamle Stadtekygiene, 190S 12.00 16.00 
 
 Raumwinkelmesser, Weber, for the measurement of the angle ot lUui i at oi an 1 
 
 elevation angle with which a given area is illuminated.. 24.00 32.00 
 
 Raumwinkelmesser, Pleier 28.80 38.40 
 
 Jlluminometer, Wingen, for measuring the illumination of a desk, work table, etc., 
 within (he limils of 10 and 50 meter candles in steps of 10. See Journ. /. Gas- 
 hei. 1,5. 738, 1902 9.30 12.40 
 
 lUuminometer, Wingen, reading in single meter candles up to 50 meter candles 
 and with lamp extended to 500 meter candles by means of smoked glass disc to 
 he inserted 19.50 26.00 
 
 Note — Complete descriptive German pamphlet of Schmidt and Haensch describing above Photom- 
 eters and, in addition, the large Physikalisch-Technische Reichsanstalt model, sent on application. 
 
A R THUR H. THOMAS COMPANY 
 
 Densitometer, Martens, for the measurement of the density of photographic plates, etc. This instru- 
 ment is a specific application of the Polarisation Photometer, with convenient stage for the plates. 
 See ZeilschriJL fur wissenschafiliche Photographie, Photophysik und Pholehemie Band VII. Heft 8, 
 1909. 
 Duty Free 78.00 Duty Paid 104.00 
 
 Densitometer, latest construction, for use with two 10 candle power 4 volts standard lamps, with stage 
 for plates, operating on the same principle as Martens Densitometer 
 Duty Free 195.00 Duly Paid 2(i0.00 
 
 View in Salesroom showing 
 
PHYSICAL-CHEMISTRY APPARATUS 
 
 Apparatus for the Determination of .Molecular Weight 
 
 Apparatus for the Determination of the Conductivity of Electrolytes (Dielectric Constant) 
 
 Apparatus for the Determination of Electro-Motive Force by the Potentiometer Method 
 
 Ostwald Viscosity Outfits, etc., etc. 
 
 Molecular Weight Determination Apparatus, Beckmann, by Depression of the Freezing Point. See 
 
 Zeilsckrift fur Physikalische Chemie, Band II, Seile 638 und Band VII, Seite 323-330. Complete 
 outfit consisting of the following: — 
 
 stirrer, four air iaekets, four freezing tubes witti corks, three filling pipettes, one freez- 
 
 Cooling Jar, witn nickel plat 
 
 Z[nc Troufih, » tl gh-'-' 
 
 Thermometer for tl i_ co< 
 
 Stirrer, for ti.e lution 
 
 Sulphuric Acid Tube W 
 
 he Hlle-l i th lulpliu a 
 air for tl e determirat ui 
 
 Thermometer, Beck ma nn DitTerentiai 
 
 Reading Device for Bei^Lnann Tl ern oi 
 
 1 1 3 rgle degrees, 
 I o\imatelv 2,1 grams of platiaum), 
 
 le t gitel the stirrer passes through tl 
 ulter p III p with drying cylinders in ordo: 
 
 I g 5t< 
 
 i;„ith3. fNo.4S2S'i,) 
 
 4230]. 
 
 42:}08. 
 
 Duty Paid 31.50 
 
 ihove. but without Beckmann Differential 
 
 Duty Free.. 23 00 
 
 Molecular Weight Determination ^pptratus i I 
 
 Thermometci 
 
 Duty Free T2.I0 Duty Paid 16.50 
 
 Molecular Weight Determination Apparatus, Beckmann, by the Depression of the Freezing Point, for 
 Hygroscopic Solutions, with freezing tube hermetically closed against the moisture of the air and 
 the stirrer operated bv electromagnet, See Zeitschrifl I'iir Phy^ikalische Chemie Baud XXI Seite 
 340 und Band XLIV Seite 169-lU- The outfit consists of the following: 
 Cooling Vessel, with nickel cover, stirrer, four air jackets, four freezing tubea with corks, three filling pipettes, one freezing 
 
 Sliri 
 
 ;) two riiiiher stoppers, 
 for the cooling misture, from — 
 of platinum, mounted on enamelled ii 
 
 Electromagnet, for opemting stirrer. 
 
 Thermometer, Beckmann DifTerential, with auxiliary sc. 
 
 Accumulator. 
 
 Metronome Contact Break, with clock-work r\inning 40 i 
 
 Spark Conductor, to suppress the first spark at the metronome br 
 
 Xo. 482S8.) 
 
 s of plat 
 
 d platin 
 
 n order to protect the contact. 
 
 Duty Free 33.60 Duty Paid 45.80 
 
 Molecular Weight Determination Apparatus, outfit complete as above but v, ithout Beckmann Differ- 
 ential 'rhermomcter. 
 Duty Free 22.75 Duty Paid 30.95 
 
423 IG. 
 42320. 
 42324. 
 42328. 
 
 42340. 
 42344. 
 
 42348. 
 
 42352. 
 4235(1. 
 42360. 
 
 Extra Parts and Accessories for the preceding Molecular Weight Determination Apparatus. 
 
 Freezing Tube :is uweci in outiit No. 42300 .40 
 
 " " with ground stopper and ground in tubulation for thermometer 1.00 
 
 Thermometer, for cooling mixture from —20 to +40° C. in single degrees 1.25 
 
 Mechanical Stirrer, with clockwork running two hours; on adjustable stand with contacts so that it 
 
 may be used as an electromagnetic stirrer as well; pendulum bob is adjustable for different 
 
 speeds 15.00 
 
 Molecular Weight Determination Apparatus, Beckmann, by Elevation of the Boiling Point. See Zeil- 
 
 schri_ftfur Phijsikalische Chemie Band XXI, Seile 245 und Band XL, Seite ISO-IU- The outfit 
 
 consists of the following: 
 
 Support, witli damp, ring, etc. 
 
 Boiling Tube, of Jena glass, with ground in stopper and tubulation for tliermometer (which may be held in place by asbestos 
 
 paper). 
 100 grams Garnets for charging material. Platinum tetrahedrona for charging may b 
 
 which are not included with the outfit. The best charging mixture consists of f 
 
 hedrons and 20 grams of garnets. 
 Jacketed Tubes with nuta cover and asbestos support. 
 Micro Bunsen Burner, witli regulating cook, and mica chimney. 
 Thermometer. Beckmann DtfTcrenlial. with auxiliary scale, graduated from 5 to G° C. in t.'r.itha. [No. 4838S). 
 
 Duty Free 17.30 Duty Paid 23.60 
 
 Molecular Weight Determination Apparatus, outfit complete as above but without Beckmann Differ- 
 ential Thermometer, 
 
 Duty Free 6.50 Duty Paid 8.75 
 
 Extra Parts and Accessories for above Mole ul r We ght Dete n n f on \ppiritu 
 
 Boiling Point Tube, Beckmann, of Jen. gl s i pi 
 
 Steaming Jacket for above when invest gat e 1 t 
 
 inside the arm. See Zeitschrift J PI j I I I 
 Boiling Point Tube, Beckmann, model of 1 05 Z 
 
 Seile 16S-1G8; -with tv/o ground ii t tp I 
 
 for discharging reflux into the jacket nt t.ht 
 
 3.25 
 
 t glass with condenser 
 
 1 7 1 H 2.50 
 
 he ie,BandXLIV, 
 
 tul ul t ns w tl reflux condenser 
 
 1 f.quired 7.50 
 
 Pastille Press, of steel, 5 mm bore 7.00 
 
 Boiling Point Apparatus, McCoy, consisting of a graduated vessel with water jacket. See Journal of the 
 
 Avierican Chemical Socit'ly, April, 1900 3.50 
 
 Boiling Point Apparatus, Jones. A glass vessel with ground in stopper and side tubulation 3.00 
 
ARTHUR H. THOMAS COMPANY 
 
 ir hanging in thermostat. 
 
 Extra 
 42368. 
 
 Apparatus for the Determination of the Conductivity of Electrolytes (Dielectric Constant) , Kohlrausch- 
 Ostwald, as used in the Leipzig laboratories. See Phys.-chem. Mess., 3 Aufiage, Seifc 4^1. Out- 
 fit consists of the following: — 
 
 ConductiTitr Vessel. Ostwald, of Jena Klaaa, with electrodes lo 
 Constant Temperature Bath, Oatwald, 2.5 era diameter and 25 
 
 tors with auDPOrts and thermometer. 
 Support for condu'tivit.y vciwls, uith removable base and clara 
 Thermometer, (I — i:ii" I i ' il - 
 Indudion CoiJ. ^M ;■! ■ i . i ■ i-lt insulation under base. 
 Condenser for I.- 1 ■ . l. ■. i mi.ion coil. 
 
 Storage Battery. .■ i l 'iipacitv 10 ampere hours. 
 
 Contact Key, u.i. |...jf*, nn polished wood base. 
 
 Slide Wire Brid;:.-. . , r ri,.^ divided into millimeters, model of the Phya .-chemise hen Institute, Leipzig. 
 
 Telephone, for n-i- ■■ i ■ i ■. ■■ i 
 
 Resistance Bov. ir^ ■ > I ■ " i ■ ■ li 17 coils, giving a total resistance of lllLl ohms, quaht}- A, in accordance witli 
 
 theroi|iJir Ji.: i .i rn'^i . :, - ;i-"l'(iehnische Reichsanatalt. 
 
 Duty Free 112.00 Duty Paid 152.00 
 
 Parts and Accessories for Apparatus for the Determination of the Conductivity of Electrolytes. 
 
 Conductivity Cell, Arrhenius, for poor conductors, with electrodes 24 mm in diameter with a sepii- 
 
 42372. 
 42376. 
 
 42384. 
 
 42388. 
 
 ration of 10 mm. Approximately weight of platinum 5.6 grams; with 
 
 extra cell of Jena glass 
 
 Extra Cell, only, for above, of Jena glass 
 
 Conductivity Cell, Arrhenius, for poor conductors, with electrodes sealed in, 
 
 ground in glass stopper with stopcock 
 
 Conductivity Cell, Ostwald, for poor conductors, with electrodes 15 mm in 
 
 diameter with separation of 20 mm. Approximate weight of platinum 
 
 2.2 grams. With extra cell of Jena glass 
 
 Extra Cell, only, for above, of Jena glass 
 
 Conductivity Cell, Ostwald, for poor conductors; with electrodes sealed in and 
 
 ground in glass stopper with stopcock 
 
 Conductivity Cell, Kohlrausch, for poor conductors, with large, firmly fixed 
 
 platinum electrodes. yVpproximate weight of platinum 4.2 grams. With 
 
 ground in Htoppcr with thermometer and graduations on cell 
 
 Conductivity Cell, Kohl rausch -Hoi born, for poor conductors, with vertical 
 
 electrodes with adjustable separation to be measured in millimeters. 
 
 Approximate platinum weight 4.2 grams. When this cell is used with 
 
 holder No. 42396 the larger rubber ring No. 42406 is necessary 
 
 Slock 
 18.40 
 
 .40 
 
No 423S0 No. -12412 wilh No. -12420 No. 42424 No. 1212b 
 42-396. Support and Holder, for any of the above cells, with removable base and ulauip 
 for fixing to side of constant temperature bath and hard rubber ter- 
 minals for electrodes with binding screws 
 
 42400, Large Rubber Ring for above, for use with cells of wide diameter such as 
 No. 42392 
 
 42404. Conductivity Cell, Nernst, for good conductors. See Deutsch. Phys. Ges. 1906. 1. 
 With five different glass electrode tubes of variable capacity for inser- 
 tion through the cover. Glass parts of Jena glass. Platinum weight 
 approximately 2,5 gramH. This may be used with support and clamp 
 No. 42396 and large ring No, 42400 
 
 42408. Extra Cell, only, for above, of Jena glass 
 
 42412. Conductivity Cell, Kohlrausch, for good conductors. See Kohlrausch-HolboTn 
 Leitvermogen der ElekiTolyle 1898 Seite 20. With adjustable electrodes 
 set in graduated tubes, each tube graduated in 45 capacities in ^ths. 
 The platinum electrodes are set in silver rods. Approximate platinum 
 weight .75 grams 
 
 42416. Extra Cell, only, with graduations but without electrodes 
 
 42420. Stand for above Cell, with removable base and with clamp for attaching to 
 side o'^ constant temperature bath 
 
 42424. Immersion Electrode, for good conductors, in protecting cylinder of glass. 
 Platinum weight approximately 1.3 grams 
 
 42428. Conductivity Cell, Kohlrausch, for good conductors, with five extra cells of 
 different capacities, with safety device for electrodes. Approx. plat- 
 inum weight 4 grams 
 
 42432. Extra Glass Cells, each 
 
 42436. Holder for the above cell similar to No. 42396 with the exception that the 
 clamp is oval as shown in illustration of ISo. 42428 
 
 42440. Conductivity Cell, Kohlrausch, with two glass stoppersand graduationsoneach 
 arm of cell in ^cm. Platinum weight approx. 4.2 grams 
 
 42444. Holder for the above cell, similar to No. 42396 but with special double rim to 
 take both arms of cell as shown 
 
 42448, Immersion Electrode, for poor conductors. Approx. platinum weight 1,2 grams 
 Note — Prices of conductivity cells involving the use of platinum vary accord- 
 ing to the market price of platinum. 
 
 Duly P'ree 
 3.10 
 
 Duty Pai 
 4.65 
 
 18.00 
 1.00 
 
 7.30 
 
 11.00 
 2.00 
 
 
 3.00 
 
 3.90 
 
 5.90 
 
 12.50 
 .65 
 
 19.00 
 1.00 
 
 3.60 
 
 5.40 
 
 10.80 
 
 16.40 
 
 3.50 
 4.00 
 
 5.25 
 S.OO 
 
ARTHUR H. THOMAS COMPANY 
 
 42452. Constant Temperature Bath, Ostwald, consisting of enam- 
 elled bath with felt cover, tripod, perforated nickel 
 shelf, micro burner and two toluol regulators, but 
 ^ without thermometer as shown in illustration. With 
 
 ^ necessary clamps and either mica vanes for stirring 
 
 by fiame from the burner or pulley for stirring by 
 motor. Type must be specified in ordering. 
 
 Duty Free 18.50 
 
 No. i2452 Stock 30.00 
 
 Constant Temperature Bath, Ostwald, rectangular form, suitable for a great variety of work in Physi- 
 cal Chemistry. Bath is of tinned copper with outside jacket of felt. Complete with all fittings 
 as shown in illustration with the exception of the thermometer and with two toluol regulators, 
 55 cm long, Zo cm wide and 35 cm hiy;h. 
 Duty Free 5.5.50 Duty Paid 75.60 
 
 42460, 
 42404 
 
 42468. 
 
 42472. 
 
 No. 424G0 
 
 Flask Holder, to til c small flasl foi use m constant temperature bath 75 
 
 " " with removable bjbe \Vhen base is removed holder may be used in constant tempera- 
 ture bath 1.75 
 
 Test Tube Holder, for use in constant temperature bath 60 
 
 Shaking Device, for flasks, etc., for use in constant temperature bath. May be attached to any 
 support 8.50 
 
4247G. Constant Temperature Bath, Freas, Sensitive Water, designed i' i liiniui 
 
 aturr I'm- tlie i-.-injie of temperature on the lower limit of i !■ i ■: ii'l' !■ n .n 
 
 on I 111- ii|i|ier limit of about 50° C. in a room of ordinui ' i.j,i' . I ! 
 
 and small variation, which does not exceed .002° niakL,-, Lliu iliciui.' iil 
 for the refined measurements of Physical Chemistry, botanical invcMi' ii 
 gravity determinations, etc. The apparatus consists of a well insulali'l i i ■ 
 capacity, provided with spacious glass windows for obsiirvations ami ij' I'M 
 the experimental work can be placed. The tank is ci|iii|iin <! a'. jHi ;i .-i n 1 1 i- 
 cury regulator wliicli controls the heat through a thcruinl f li ■■ <■ r ■ ■. 'ni'li 
 with low thermal capacity and motor suspended on ailj , i.iMi i-nnu. '■■■' i 
 noise and vibration; device for maintaining constant waLn level ami di;vir(- [< 
 in the tank when the room temperature is too great. Complete with regulator (without mer- 
 cury) motor, etc., ready for connection with water supply, drain and current. Further descrip- 
 tion, price and illustration on application. 
 
 42480, Thermometers, Ostwald, specially made for use in constant temperature baths, as used in Physical 
 Chemistry, etc. With enclosed milk glass scale. 
 
 Kange +10° to +30° C. to +60° C. +50 to +105° C. +100 to +150° ('. 
 
 Graduated in iV" iV° u>° rs" 
 
 Each ' 2.00 2..50 4.00 "" 5^" 
 
 iijil, teriiper- 
 .-iipply and 
 'If ^Lccuracy 
 
 Kid a mer- 
 
 ■irnt lamps 
 
 vibrator^' 
 
 i the V 
 
 No. J250.S 
 
 No. 42500 
 
 42484. 
 
 42488. 
 
 42492. 
 
 42496. 
 42500. 
 
 42504. 
 
 42508. 
 
 42516. 
 42520. 
 42524. 
 42528. 
 
 Stirring Device, Luther, for operation by suction and for chemically pure solutions and other liquids 
 
 attacking metal. For use in constant temperature bath 8.00 
 
 Toluol Regulator, Ostwald, simple form, with by-pass, for use with gas regulating valve on Constant 
 
 Temperature Baths No. 42452 or 42456 _ 1.50 
 
 Toluol Regulator, Ostwald, same as above but with fine adjustment, reservoir and new form of 
 
 clamp 6.00 
 
 Toluol Regulator, Ostwald new form, with by-pass and stopcock 5,00 
 
 Contact Arrangement, Ostwald, with regulating device as in preceding, to be attached to air, liquid 
 
 or steam regulators so that the control of the gas may be operated by electricity 7.50 
 
 Wheatstone Slide Wire Bridge, 1000 mm long, with millimeter scale and ohm divisions for direct read- 
 ing of the resistance in ohms '. : 10.00 
 
 Wheatstone Bridge, cylindrical form, with two scales^ one divided in 1000 equal parts and the other 
 in ohms. 
 
 Duty Free 45.00 Duty Paid 54.00 
 
 Wheatstone Bridge, same as No. 42508 but with comparison resistances in the base plate of ^, 1, 10, 
 100 and 1000 ohms. 
 
 Duty Free 82.50 Duty Paid 100.00 
 
 Telephone, for use with above bridges 3.00 
 
 Small Key " " " " " 1.50 
 
 Tnductorium " " " " " 12.00 
 
 Set of Pure Resistances, Leeds & Northrup, with four coils, 1-5000 ohms, 1-10000 ohms and 2-20000 
 ohms. These coils are wound according to the specifications of the U. S. Bureau of Standards 
 for pure resistances, i.e. resistances without any appreciable capacity or induction effect. See 
 Bulletin of the U. S. Bureau of Standards, Vol. 8, p. ^.95, Bifilar winding gives very good re- 
 sults in coils of 1000 ohms oi' less, but in electrolytic work errors due to capacity and inductance 
 become appreciable when using coils of higher value.'* wound in that manner. Therefore, it is 
 recommended that, when high resistances are required, this box be used in conjunction with one 
 or the other of those previously listed. Each coil is connected to two small binding posts on 
 the top ]-ubber plate in order to keep the capacity of the connections at a minimum .50.00 
 
ARTHUR H. THOMAS COMPANY 
 
 INS 
 
 4L'340. 
 42514. 
 
 Slide Wire Bridge, Kohlrausch, Leeds & Northrup, with extension coils specially designed for use in 
 the measurement of electrolytic resistances. The slide wire resistance is about 25 ohms and 
 end coils are provided to increase the effective length of the slide wire. These coils are exactly 
 H times the resistance of the slide wire so that the slide wire is rsth of the total resistance. The 
 position of the contact is read by means of the vertical glass scale which reads complete turns 
 and also by the scale on the periphery of the hood, which latter is divided into 100 parts, each 
 division being about 6 mm. These divisions are further subdivided into halves so that it is 
 possible to estimate to T"'iMith of a, complete revolution or to j-ijJu,-|th of the total motion of the 
 contact point. Used and recommended by many leading Physical Chemists 68.00 
 
 Standard Resistance Box, Leeds & Northrup, with coils .5, 1, 2, 3, 4, 10, 20, 30, 40, 100, 200, 300. 400, 
 1000 ohms. An infinity plug is also provided. The coils are arranged on the plug out plan and 
 are guaranteed to be accurate to within ■■J-r.%. The coils are bifilar wound and are practically 
 free from capacity and inductance, and are particularly recommended for use in the measure- 
 ment of electrolytic resistances. The wire used is of manganin which has a very low temperature 
 coefficient. The accuracy of the coils is, therefore, practically unaffected by ordinary changes 
 in temperature. The blocks and plugs are large, insuring good plug contacts 85.00 
 
 Standard Resistance Box, Leeds & Northrup, similar to No. 42536 but containing the following coils; 
 .5, 1, 2, 3, 4, 10, 20, 30, 40, 100, 200, 300, 400, 1000, 2000. 3000, 4000, 10000 ohms, and an infinitv 
 plug 100.00 
 
 Induction Coil for Electrolytic Measurements, Leeds & Northrup, with extreme rigidity of the vibrator 
 so that it will operate in spite of mechanical vibrations and short circuiting of the secondary 
 coii. The vibrator is provided with a slow motion set screw so that fine adjustments are possible. 
 Operates on a single cell of storage battery and is enclosed in a felt lined case, and consequently 
 makes very little noise 20.00 
 
 Head Band Telephone Receiver, Leeds & Northrup, specially made for laboratory work, unusually sensi- 
 tive aTi[I with strong permanent magnets. The receiver is thoroughly insulated from the head 
 blinds which are strong and light in weight. With 6 ft. of flexible cord. 5.00 
 
 42552. Resistance Box, Otto Wolff, in decade.s with plug 
 connection. Decades 10 x 1000 with a total 
 resistance of 100,000 ohms. Of manganin 
 wire. 
 
 Duty Free 49.50 
 
 Duty Paid 66.00 
 
 42556. Platinizing Solution, according to Kohlrausch and 
 Holborn, consisting of a 3% solution of 
 platinic chloride and ^i^yth of 1% solution 
 of lead acetate. In 50 cc bottles, per 
 bottle 2.50 
 
 42560. Binding Posts, Ostwald. Sheet or wire can be 
 held equally tight. 
 
 Style __A _B C 
 
 Each .35 .35 .35 
 
Apparatu ior tht Deter i at oi of LI ctro raoti e F rce b, the Potentiometer Method, auji,ed ac- 
 cording to Ostw:ild and as used in the Leipzig laboratories. See Phy.-chem. Mess., S, Auflage, 
 Seite 4^6. Outfit consists of the following: — 
 
 Capillary Eleclromeler with iiiicroacope of 30 and 60 diameters and ocular micrometer divided into V^ mm, with movable 
 
 mirror aud homontal fine adjustment on the microscope. 
 Electrometer Key, with platinum contact, on wooden base. See Phya.-chem. Mesa. 398. 
 Cadmium Normal Element, mounted on board, with binding posts. 
 
 Slide Wire Bridge, with scale 1 meter long divided into millimeters, model of the Phys.-Chemischen Institute, Leipzig- 
 Accumulator. 
 
 Contact Key for one circuit, with three posts, on polished wooden base. 
 
 1 pair of Half Elements No. 4362S with Cylinder No. 42f)32. Stand and Clamp No. 42636 aud with two each of No. 42640 
 Electrodes. 
 
 Mercury Commutator with six binding posts. 
 Duty Free. 4(5 Dut> Paid 63.75 
 
 42568. Capillary Electrometer, with microscope of 30 and 60 diameters and ocular micrometer divided into 
 1^ mm, with movable mirror and horizontal fine adjustment on the microscope. Illustration 
 
 shows Tube No. 42576 in position 25.00 
 
 42572. Capillary Electrometer Tube, Ostwald, vertical form 30 
 
 42576. " " " Luther, with contacts and already filled 3.00 
 
 42580. Mercury Commutator, with six binding posts 4.00 
 
 42584. Contact Key, for one circuit, with three posts, on polished wooden base. As shown on right hand 
 
 side of outfit No. 42564 2.25 
 
 42588. Contact Key, for two circuits, with five binding posts 4.25 
 
 42592. " " du Bois-Reymond, on wooden base 4.25 
 
 42596. Plug Key, on polished wooden base 2.75 
 
 42600. Electrometer Key, with adjustable contact screw on spring, mounted on hard rubber 6.75 
 
 395 
 
4260S. 
 42612. 
 
 42624. 
 42628. 
 
 42632. 
 
 42636. 
 42640. 
 
 42644. 
 42648. 
 42652. 
 426.56. 
 
 42660. 
 42664. 
 
 42666. 
 42668. 
 
 42672. 
 42680. 
 
 Nos. 42628 to 42640 
 
 Cadmium Normal Element, Drucker, with two platinum contacts, in protecting tube, with two corks, 
 witliout any support and to be filled by user. See Phys.-Chem. Mess. 419 1.25 
 
 Cadmium Normal Element, on board, with binding posts and clamp to hold glass vessel in position 3.25 
 
 Battery of Five Cadmium Normal Elements, mounted on board as in No. 42608, with binding posts, 
 (.lamps, etc. 
 Duty Free .... 14.85 Duty Paid 20.25 
 
 Chemically Pure Material and solution for filling above elements as the cells can not be sent out filled. 
 Ill air-tight glass containers. 
 
 To fill, elements 1 2 5 
 
 Each l775 3.00 6.00 
 
 Weston Standard Cell, Unsaturated Form, Model 4. At ordinary working temperature (15" to 35° C) 
 change in E.M.F. is so small as to be negligible in most work. The E.M.F. is about 1.0187 volts 
 at 20° C. Each cell is accompanied by a certificate giving the exact E.M.F. and other neces- 
 sary data 15.00 
 
 Weston Standard Cell, as above, with National Bureau of Standards certificate 17.50 
 
 Glass Cells for Half Elements, with syphon and tubulation with rubber tubing and pinchcock. Per 
 
 pair . 
 
 Cylinder for connecting the two half elements .15 
 
 Supports, with element holder, mercury contact and binding posts. Per pair 4.50 
 
 Metal Electrodes, mounted in glass tubes with rubber stopper to fit above glass cells. 
 
 IVletal Platinum Platinum Silver Gold Zinc Copper 
 
 Foil Ring Spiral Foil Rod Kod 
 
 Each 2.00 .75 .75 1.75 .50 .50 
 
 Glass Cells for Gas Electrodes, Ostwald, with syphon and glass stopuoL'k. Per pair 3.00 
 
 Cylinder for connecting the two elements .15 
 
 Supports, with element holder, mercury contact and binding posts. Per pair 4.50 
 
 Electrodes, on glass tube, with rubber stopper, of platinum foil. Approximate platinum weight 1.2 
 
 grams. Per pair , 5.50 
 
 Platinum Electrodes, Luther, with internal contact. Per pair 2.25 
 
 Glass Cell, Druoker, for Calomel Normal Electrode, with fused in platinum wire, syphon and tubula- 
 tion with rubber tubing and pinchcock. Each 90 
 
 Support, for above, with clamp and detachable base 1.75 
 
 Glass Cell, Drucker, as above but with glass stopcock in syphon, as shown in illustration of No. 
 
 42072 1.75 
 
 Glass Cell, Drucker, as above but with electrical connection from above and with glass stopcock in 
 
 syphon 1.75 
 
 Migration Tube, with silver and copper electrode 3.50 
 
42692. 
 42696. 
 
 Outfit for the Determination of Viscosity. Ostwaid, consisting of rectangular constant temperature 
 bath with two glass sides and with support for two viscosity tubes. With stirring device, three 
 capillary tubes from SO to 100 seconds outflow time, two toluol regulators, with clamp, micro 
 burner, small flask, pipette and a thermometer holder. 
 Duty Free 22.50 Duty Paid 30.75 
 
 Viscosity Tube, only, as furnished with above outfit, from 80 to 100 seconds outflow time when not 
 otherwise specified .75 
 
 Viscosity Tubes, in sets of six, with varying times of outflow from 20 to 250 seconds. Per set, , . 3.75 
 
 Viscosity Tube, Drucker, new form, with glass stopcock. Time of outflow SO to 100 seconds unless 
 otherwise specified 4.00 
 
 42700. Model for Lecture Table Demonstrations of the Migration of Ions, Kohlrausch. See Zcdschrifl ftir 
 physikalische Chemic, XXXIV, 5, 1900. 
 Duty Free 16.50 Duty Paid 22.00 
 
 In the preceding section on Physical Chemistry and in the following section on Physio- 
 logical Apparatus no effort has been made to list all of the apparatus offered by the leading 
 European manufacturers. In the section on Physical Chemistry we have selected typi- 
 cal apparatus for routine and teaching work in the most important subjects under this 
 heading. 
 
 In the section on Physiological and Clinical Apparatus the apparatus has been selected 
 with special reference to laboratories of Experimental Pathology, Experimental and Clini- 
 cal Medicine, Pharmacology and Experimental Therapeutics. We have made no attempt 
 to list a complete section of apparatus for bath teaching and research in Physiology as 
 such. 
 
 We keep on hand a supply of European manufacturers' catalogues covering very com- 
 pletely the latest developments in apparatus for both Physical Chemistry and Physiology 
 and these catalogues are sent to customers where wider choice of apparatus seems advis- 
 able. 
 
PHYSIOLOGICAL AND CLINICAL APPARATUS 
 
 42S00. Kymograph, Hiirthle, mounted 
 on heavy oak table, with 
 two cylinders of 20 cm 
 diameter and 25 cm high 
 adjustable as to distance 
 apart so that papers of 
 from 60 to 330 cm in 
 length can be used. With 
 new reducing gear so that 
 speeds can be obtained 
 from 0.2 to 120 cm per 
 second. As supplied by 
 us to Rockefeller Insti- 
 tute for Medical Re- 
 search, Harvard Univer- 
 sity, University of Wis- 
 consin, University of 
 Pennsylvania, University 
 of California, Drs.Mayo. 
 Gralmm, Plummer & 
 Judd, U. H. Public 
 llr;ilih & Marine IIos- 
 pil;d Service, etc. 
 
 Duty Free 282.00 
 
 Duty Paid 338.40 
 
 41'S04. Apparatu.s for smoking paper 
 with gas flame, aftfr 
 HiirlhJe. 
 
 Duty Free 25.50 
 
 Duty Paid 30.60 
 
 12S0S. Special glazed paper, 50 cm 
 wide, in rolls of 10 
 meters. Per roll, from 
 stock 1. 00 
 
 kymograph, Brodie, mount 
 ed on strong table 
 with top 51x24 inches. 
 The recording drum 
 is 9 inches in diameter 
 and 10 inches high 
 and will take papers 
 of varying length from 
 6 ft. 3 in. to 9 ft. 6 in, 
 A fine adjustment i^ 
 provided on the small 
 drum for tightenini;; 
 the paper. The timr 
 marker and signal are 
 conveniently placed 
 under the drum so as 
 not to interfere with 
 the manometer. Price 
 includes separate pair 
 of drums for smoking 
 and varnishinji, 
 mounted on wall 
 brackets. A recent 
 improvement is a two 
 speed gear so that the 
 speed may, at any 
 moment, be increased 
 from H to 24 times. 
 
 Duty Free 330.00 
 
 Duty Paid 400.00 
 
 Special giazed paper, 1 
 inches wide, in rolls 
 of 200 yards. Per 
 roll 4.00 
 
 
ARTHUR H. THOMAS COMPANY 
 
 KYMOGRAPH, ZUNTZ, for practical class work in \Ur lnl.m ni.iry. The drum is 18 cm high and is immediately 
 detachable for the purpose of attachinji th , ., _ . |. Ii may be readily smoked on the drum with the 
 apparatus in the horizontal position. Wii I. \ ,.i .al... .-.]".(.■( is as noted in the descriptions below, 
 42S20. Kymograph, as above, with clock-work, fur usu i-iiln.>r vertically or horizontally, surface speed of cylin- 
 der varying from 5 to 40 mm per second, iiy the use of the fan governor No. 42840 the speed may 
 be reduced to one revolution per hour equal to a surfacespeedof SOOmmper hour. 
 
 Duty Free 30.00 Duty Paid 36.00 
 
 42824. Kymograph, as above, but with Fiihner's .slow motion modification consisting of a supplementary lever 
 by the use of which the speed may be reduced to one rotation in 24 hours. In addition to this 
 slow motion the instrument will give all the speeds attainable with No. 42820, 
 
 Duty Free 43.50 Duty Paid 52.25 
 
 42828. Kymograph, same as No. 42820 but with a special quick motion providing a surface Duty Free Duty Paid 
 
 speed of 200 mm per second, inadditionto the regular speeds of No. 42820 40.50 48.60 
 
 42832, Kymograph, same as 42820, but without clock-work, with pulley wheel for driving by 
 
 independent motor 21.00 
 
 42836. Support, Adjustable, for kymographs listed above (see St of No. 42844). This sup- 
 port provides a convenient means of attaching the writing levers, etc 4.50 
 
 42840. Fan Governors, for above kymographs in three sizes, each .90 
 
 42844. Attachment for Supporting a Continuous Ink Record. Price does not include adjust- 
 able support No. 42836 which must be added 7.50 
 
 42848. Support, Extension, for use with endless papers by the Hering method 18.00 
 
 42852. Carrying Case, with handle and lock 7.50 
 
 42856. Glazed Paper, 510 x 180 ram, gummed. Per 100 sheets 1.15 
 
 42860. Recording Drum, Sherrington-Stariing, with drum 6x6 inches adjustable up and down the shaft. Two 
 electric contact springs are provided by which contact at any two points in the revolution can be 
 made. There are two driving gears within the base, a worm and wheel for the slow motion and 
 a volute gear for the fast, with friction-clutch for stopping and starting, A change speed gear 
 permits a range of speeds from 1 to 870 revolutions in a given time depending on the speed of 
 the driving motor. Without driving motor. 
 
 Duty Free 35.25 Duty Paid 42.30 Duty Free Duly Paid 
 
 42864. Recording Drum, as above, with screw lifting device 38.25 45.90 
 
 42868. Extra Cylinder, 12 inches in diameter 18.00 21.60 
 
 42872. Glazed Paper, per roll of 200 yards 2.25 2.70 
 
 25.20 
 
 5.40 
 1.10 
 
 9.00 
 
 21.60 
 
 9.00 
 
 1.35 
 
ARTHUR H. THOMAS COMPANY 
 
 
 4287(i. Chronometer, Graphic, Jaquet, Uk; niuat accurate and widely used time marker, reading in seconds and 
 ',th si'iiHids. For use in cither vrtical or horizontal position. See Jaquet "Studien iiber graph- 
 'hche Ziili-egistrierung. Zeilschrifi fiir Biologic, Bd. XXVIII, S. 3 1S91. 
 Duty Free 33.75 Stock 43.85 
 
 428811. Chronometer, Graphic, Jaquet, New Model, with arrangement for writing inter- uuty Free Duty paid 
 vals of 3 and seconds in addition to the 5th and single seconds, the addi- 
 tional adjustment being controlled by lever operating on small arc 42.50 55.25 
 
 42884- Metronome, Jaquet, with mercury contact, giving contact intervals, by adjust- 
 ment of weight on the lever arm, from \ to I5 second. A further interval 
 of 3 seconds is possible by arrangement of the contact. Operates 30 hours 
 at one winding 
 
 42888. Tuning Fork, electro-magnetic, adjusted to 100 double vibrations per second. . . . 
 
 42892. " " " " with direct writing point, adjusted to 100 double 
 vibrations per second 
 
 42896. Manometer, Spring, Hiirthle, for registering arterial blood pressure in animals. 
 See PJliigers Arcliiv Bd. pS. 5 
 
 429(10. Manometer, Mercury, Hiirthle, for control of spring manometers, etc. See 
 PfliigevK Archil' Bd. ^3 ^. W 
 
 42904. Manometer, Mercury, Ludwig-Cyon, in metal mounting, with three-way stop- 
 cock, etc 
 
 42908. Manometer, Combined Spring and Mercury, Hiirthle. See Pfiugers Archiv Bd. 
 73 S. 670 
 
 42912. Calibrated U Tube for above 
 
 42916. Lever for adjusting the manometer to the height of the heart 
 
 42920. Piston Recorder, Hurthle, with throe brass cylinders of IS. 24 and 30 mm in 
 diameter and with counterpoised lever. Improved form op->rating with- 
 out oiling of the piston 24.00 
 
 IS.To 
 15.00 
 
 24.40 
 18.00 
 
 16..>0 
 
 19.80 
 
 21.00 
 
 25.20 
 
 .1.40 
 
 6..50 
 
 20.40 
 
 24.50 
 
 48.00 
 l.SO 
 .90 
 
 ,57.60 
 2.15 
 1.10 
 
— © 
 
 
 ^3 
 'If 
 
 DuU Free 
 
 42924. Signal Marker, ulectric, simple mo, lei J "^ 
 
 4282S. " " Deprez electric, for registering very small time intervals, with 
 fine adjustment of writing point, rack and pinion adjustment for length, 
 etc 24.00 
 
 42932. Signal Marker, same as No. 42928 but with two writing points 42.00 
 
 42936. " " electric, with the armature of the magnet controlled by a spring 
 
 adjustable from 50 vibrations per second to 250. by means of a screw 27.50 
 
 42940. Tambour, Marey, with fine adjustment and double transmission for the writing 
 
 lever 9.00 
 
 42944. Tambour, Marey, o cm in diameter 4.2(1 
 
 42948. " " " with fine adjustment of the writing point 4.80 
 
 429-52. " " 3 cm, with rubber membrane lield in place by a clamped ring, 
 with adjustment for changing fulcrum of writing lever in order to adjust 
 capsule to the atmospheric pressure 13.2-5 
 
 429-5(). Tambour, Marey, Straub's modification, with adjustment for the membrane by 
 means of milled head, which can be carried on while experiment is in 
 progress. Membrane is clamped in position by metal ring as in No. 42952 
 and apparatus is also furnished with air valve 24.25 
 
 429(iO. Support, Adjustable, for physiological work, with vertical rod 10 mm diameter, 
 
 SO cm hit;h, with fine adjustment on the vertical axis 14.50 
 
 Pul I did 
 
 -I lO 
 
 2S.,S0 
 .50-40 
 
 .r>.75 
 
 10.80 
 
 5.00 
 
yyyu 
 
 Liyyyyu 
 
 42968. 
 42972. 
 
 4297(i. 
 42980. 
 
 42984. 
 42986. 
 42988. 
 42992. 
 42996. 
 43000. 
 
 43004. 
 
 43008. 
 
 43012. 
 
 43016. 
 
 Support, Adjustable, for holding tambours, etc., in contact with the drum, wi 
 hue adjustment at "A" 
 
 Support, Large Universal, for physiological use with all adjustments, 55 cm high 
 
 Inductorium, Du Bois-Reymond, for physiological work, with Meyer's interrup- 
 ter and scale with which to read the position of the secondary coil, with 
 5.000 turns of wire 
 
 Inductorium, same as above, but with 10,000 turns of wire 
 
 " Vertical Form, secondary being carried by pulley over bar;^, with 
 counterpoise. With 5,000 turns of wire 
 
 Inductorium, same as above, but with 10,000 turns of wire 
 
 Electrodes, Fleisch, unpolarizable. Per pair 
 
 " Ludwig, for deep seated nerves, in hard rubber mountinf;. Per set, , 
 
 Contact Key, Du Bois-Reymond, on heavy base 
 
 Commutator, Pohl 
 
 Canulae, of glass for arteries, with bore of from 2 to 8 mm, in sets of 20 pieces. 
 Per set. _ 
 
 Canulae, of metal, for arteries, with bore of from 2 to 4 mm in sets of 6 pieces. 
 Per set 
 
 Canulae, of metal, for the trachia. State diameter in ordering. These canulae 
 rotate and are provided with opening for control of expired air. Each 
 
 Canulae, same as above, in set of 11 from 2 to 12 mm diameter in steps of 1 mm. 
 Per set ._ , 
 
 Respiration Pump, Brodie, with barrel 3 inches io diameter x 11 inches long. 
 By a simple adjustment of the crank the throw of the piston may 
 be quickly altered to deliver any quantity up to 1 liter of air per thrust. 
 The valves are of simple construction and easily reached for examination. 
 Mounted on a board for fixation on the wall of the laboratory 
 
 Duly Free 
 
 18.75 
 
 31.50 
 
 Duty Paid 
 24.40 
 37.80 
 
 18.00 
 21.00 
 
 21.60 
 25.20 
 
 .36.00 
 40.50 
 1.35 
 6.75 
 4.00 
 3.75 
 
 43.20 
 48.60 
 1.75 
 8.00 
 5.20 
 4.90 
 
 1.05 
 
 1.50 
 
 2.40 
 
 3.25 
 
 2.25 
 
 2.70 
 
 22.50 
 
 27.00 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 Artificial Respiration Apparatus, Meyer. See Arckiv. f. cxp. Path. u. Pharmakologie Bd. ^7, pag 4-26. 
 Adjustable from 20 respirations of 1000 cc of air per minute to 100 reapir- Duty Free Duty Paid 
 
 atioris of 25 cc. With water motor for pressure of at least 30 lbs 165.00 200.00 
 
 Artificial Respiration Apparatus, same as No. 43020 but for water pressure of from 
 
 1.5 to 30 lbs 185.00 225.00 
 
 ArtiScia) Respiration Apparatus, sameasNo. 43020 but with electric motor. State 
 
 voltage and current in ordering 175.00 210,00 
 
 Artificial Respiration Apparatus, same as No. 43020 but with small cylinders deliv- 
 
 erinff from to 350 cc of air per thrust 150.00 180.00 
 
 .\naesthetizing Valve, Meyer, with stopcock, for use in connection with arti- 
 ficial respiration apparatus to obtain proper mixture of air and anaesthetic. 
 
 For small animals 10.80 13.00 
 
 43040. Anaesthetizing Valve, same as above but for 
 
 large dops 13.50 16.25 
 
 43044. Respiration Valve, after 
 
 Metzner 9.00 11.75 
 
 43048. Anaesthetic Bottle and Air Warmer, Brodie, 
 for use in connection with the above Res- 
 piration Pump No, 43016 and can be furnished 
 with Dr. Brodie's animal operating table 
 No. 20244. The heater consists of a brass tube 
 with removable ends, holding two ordinary 
 electric light bulbs, each with separate 
 switch. It is advisable to have lamps of 
 different candle-power such as 8 or 16, which 
 may be used singly or tojicther in accord- 
 ance with the amount of air and degree of 
 heat required. The illustration shows the 
 form as regularly supplied for attaching to 
 the end of Dr. Brodie's operating table, but 
 it is also furnished at same price mounted 
 separately, where a more portable appara- 
 tus is required. In ordering please state 
 voltage and whether table or portable form 
 is desired. Complete with one extra glass 
 onsesthesia bottle. 
 
 Duty Free 25.20 
 
 Duty Paid 30.25 
 
Spirometer. Jaquet, for the investigation of the products of respiration. The analysis of the air from 
 the Spirometer is best conducted by the exact method of Petersen and Palmquist (See No. 293S8). 
 See Prof.Jaquel—"Uber die Nachwirkung einer ansirengenden Muskelarbeit auf den Stoffwechsel." 
 Archivfiir experimentcUe Pathologic und Pharmakologie. Bd. 62, pag, 3.iJ;and Gigon — "Vbereinige 
 Fragen des Stofficechsels und der Ernahrung." Miinchner Mediz. Wochensckrift Nr. 25. 1911. 
 Duty Free 200.00 Duty Paid 260.00 
 
 Respiration Apparatus, Jaquet, for the convenient securing and the accurate measurement of the 
 products of respiration, consisting of a large ventilating chamber constructed to order of any 
 size for animals, children or adults. This illustration shows an instrument turnished the Pedi- 
 atric Clinic at Strassburs* with the respiration chamber of sufficient size for small children. 
 The chamber ia connected as shown by dotted lines to the large gas meter "G" which is 
 driven by an electric motor. With a controlling rheostat the speed of the motor is changed 
 to vary the ventilation of the chamber. The determination of the oxygen and carbon 
 dioxide content of the tested air with the total volume passing through the meter makes it pos- 
 sible to estimate the total oxygen requirement aa well as the earbou dioxide output of the 
 individual under experiment. Price, depending upon the size of the respiration chamber, on 
 application. 
 
 References. 
 
 Jaquet — Ein neuer Apparal zur Untersuckung des respiratorischen Sloffwechsels des Menschen. Ver- 
 handl. d. Naturforschenden Geseilsckaft Basel 1903. B. 15, p. 252. 
 
 Stahelin — Zum Energiehauskalte hei der Lungentuberkulose . Verhandl des XXIV. Kongr. fur innere 
 Medizin. Wiesbaden 1907. 
 
 Stahelin — Der respiratorische Stoffwechsel eines Fetlsuchtigen, Zeitschrift filr klinische Medizin. Bd. 
 LXV. 
 
 Gigon — Uber die Bedeutung der Gewurze in der Ernahrung (nach Respirationsversucken) . Verhand- 
 lung des XXIX deuischen Kongresses fur innere Medizin Wiesbaden. 
 
 Falta, Grote, Stahelin — Versuche iiber Kraft- und Stoffwechsel u. s. w, Hofmeisters Bertrdge zur chemi^chen 
 I'hfi^iologie iind Pathologic 9. 
 
 43060. Gas Meter, Experimental, Bohr, original Danish make, 
 as widely used in physiological work in connec- 
 tion with respiration and nutrition experi- 
 ments, etc. With level and regulating screw. 
 
 Capacity, liter.? 
 
 10 
 
 Duty Free 28.00 38.00 44.00 50.00 60.00 
 
 Duty Paid 35.00 47.50 55.00 62.50 75.C0 
 
Apparatus, Barcroft and Haldane, for Determining the Oxygen Capacity and Carbonic Acid Content of 
 p ^j^'***"^ '^y ^^^^ ferricyanide method modified by Plesch. See J. Plesch. Haemodynamische 
 Studien, Berlin 1909. Hirschwaid and J. Plesch. Die Besiimmunq des Schlaqvolumes. D.Med 
 Wochenschrift 1909. No. 6. 
 Duty Free 7.80 Duty Paid 11.50 
 
 Apparatus, Barcroft and Roberts, for Determining the Differential Pressure of Blood Gases. See 
 Journal of Physiology X LIT, j). 512. 
 Duty Free 9.00 Duty Paid 13.20 
 
 Apparatus for Determining the Differential Pressure of Blood Gases for the use of very smali quanti- 
 ties of blood, i. e. I'o cc. As used in the systematic determination of the haemaglobin worth or 
 dissociation curves of human beings. 
 Duty Free 3.25 Duty Paid 4.75 
 
 No. 43076 
 
 MACKENZIE INK POLYGRAPH, English make. This instrument records two simultaneous tracings only, 
 i. e. radial pulse and one other, such as carotid, jugular, apex beat, etc., the great advantage being 
 the avoidance of smoked paper and tlie convenience and permanency of the ink tracings which may be 
 continued almost to any length from the long roll of paper supplied with the instrument. The instru- 
 ment is not attached to the patient's wrist and by many is preferred because of this feature. The 
 clock work operates at variable speeds permitting the taking of protracted records at different speeds. 
 Mackenzie Ink Polygraph including a wrist cuff with tambour for the radial pulse, metallic receiving 
 capsules, two sets of pens, one dozen rolls of paper, bottle of ink, brush for loading pens and 
 necessary rubber tubes for connection. 
 
 Duty Free 65.00 Stock 84.00 
 
 Extra Paper Rolls, per dozen 80 
 
 Extra Writing or Time Marker Pens. In ordering please state length of pen desired. Each .60 
 
 43076. 
 
 43080. 
 43084. 
 
ARTHUR H. THOMAS COMPANY 
 
 JAQUET SPHYGMOCARDIOGRAPH, In these instruments one tracing must always be that from the radial 
 artery, over which the instrument is fixed in place, either by means of a cuff as in the older forma, or 
 by means of the arm rest No. 43136 as shown in above illustrations. In the single tambour type, there- 
 fore, two simultaneous tracings are made in addition to the chronograph record, i. e. the radial pulse 
 from the pelotte attached to the instrument and one other tracing through the single tambour and 
 which may be taken from the jugular, carotid, apex beat, respiratory movements, etc. In the double 
 tambour type two tracings may be made simultaneously in addition to that from the radial pulse and 
 the chronograph record. The double tambour type is the most widely used form of Jaqnet instru- 
 ment. Both types are provided with two speeds so that tracings may be greatly magnified by the use 
 of a high speed. 
 Jaquet Sphygmocardiograph, Single Tambour type, with cuff for attaching to wrist and 100 glazed 
 
 paper recording strips, but without arm rest, cardiograph attachment or receiving tambour. 
 
 Duty Free 55.00 Duty Paid 71.50 
 
 Jaquet Sphygmocardiograph, Single Tambour type, with arm rest No. 43136, cardiograph attachment 
 
 for apex beat No. 43108, receiving tambour, 30 mm in diameter, for jugular, carotid, etc., cylinder 
 
 for smoking papers No. 43132, 100 paper recording strips and bath for fixing records in varnish 
 
 No. 43128. 
 
 Duty Free 84.65 Duty Paid .'. . . 110.00 
 
 Jaquet Sphygmocardiograph, Double Tambour type {.the most widely used form) with cuff to attach 
 
 to w;rist and 100 paper recording strips, but without arm rest, cardiograph attachment or re- 
 ceiving tambour. 
 
 Duty Free 76.00 Duty Paid 100.00 
 
 Jaquet Sphygmocardiograph, Double Tambour type, with arm rest No. 43136, cardiograph attachment 
 
 for apex beat No. 43108. receiving tambour, 30 mm in diameter, for jugular, carotid, etc.. No. 
 
 43120, cylinder for smoking paper No. 43132, bath for fixing records in varnish No. 43128 and 100 
 
 paper recording strips. 
 
 Duty Free 105.75 Duty Paid 137.50 
 
 Accessories. 
 
 43108. Cardiograph Attachment only for taking apex beat, with girdle, etc 
 
 43112. Pneumograph after Marey for taking respiratory movements 
 
 43116. Glycerine Pelotte for taking tracings from any superficially located arteries and 
 
 as particularly recommended for use on children 
 
 4.5120. Receiving Tambour for jugular, etc., 30 mm in diameter 
 
 43124. " " of special shape for the liver 
 
 43128. Bath for varnishing the tracings 
 
 43132. Cylinder for smoking i)apers 
 
 43136. Arm Rest new model as shown in illustrations 
 
 43140. Glazed Paper Recording Strips for single tambour instrument per 100 strips. . . . 
 
 43144. Glazed Paper Recording Strips for double tambour instrument per 100 strips. . . . 
 
 43092. 
 
 43096. 
 
 43100. 
 
 43104. 
 
 Duly Free 
 
 
 l.'1.75 
 
 18.00 
 
 17 50 
 
 22.75 
 
 6.25 
 
 8.15 
 
 1 15 
 
 1.50 
 
 1 65 
 
 2.25 
 
 1 25 
 
 1.75 
 
 3 00 
 
 4.00 
 
 10.50 
 
 13.75 
 
 .40 
 
 .50 
 
 1.00 
 
 1.30 
 
ARTHUR H. THOMAS COMPANY 
 
 |)^^i=a^ 
 
 t,l,A 
 
 PS. il<L. 
 
 PORTABLE POLYGRAPH, with continuous roll (20 meters) of smoked paper. This instrument consists of an 
 accurate clock movement importing two speeds to the paper, a time marker recording in Jth seconds 
 and three recording tambours, each of which may receive impulses from three different parts of the 
 body for simultaneous tracing. The instrument thus answers the purpose of a kymograph and is 
 valuable for many purposes because of its extreme portability. The same instrument is furnished 
 with a mercurial sphygmomanometer (No. 43156) indicating blood pressure and a cuff writing attach- 
 ment. In this arrangement of the instrument one of the tambours must of necessity be used for re- 
 cording the tracings of the brachial pulse under various pressures, while the other two tambours may 
 be used to record any other two tracings such as the radial, jugalar or carotid pulse, apex beat, respi- 
 ratory movements, etc., under an accurately determinable blood pressure as is read in a manometer. 
 The pressure applied to the cuff is transmitted to the manometer, and at the same time, to the writ- 
 ing tambour by means of a rubber bulb enclosed within a glass bulb, or Erlanger capsule. 
 4314S. Portable Polygraph, with three tambours, continuous roll attachment and one roll of prepared smoked 
 
 paper strips 20 meters long, in polished wood case, but without other attachments. 
 
 Duty Free 65.75 Duty Paid 85.00 
 
 431.')2. Portable Polygraph, as above, with Sphygmograph No. 43164 for taking radial pulse, Cardiograph No. 
 
 43168 for taking apex beat, receiving tambour for carotid with zero pressure valve, set of four 
 
 glass receiving tambours for jugular and other venous pulses, and two rolls of prepared smoked 
 
 paper strips, 20 meters long. 
 
 Duty Free 80.00 Duty Paid 102.00 
 
 43156. Portable Polygraph, similar to No. 4314S but with the addition of a sphygmomanometer and cuff for 
 
 recording brachial pulse under varying pressures, with two recording tambours for use with the 
 
 two remaining writing tambours (one being in connection with the brachial pulse) and two rolls 
 
 of smoked paper, 20 meters long. 
 
 Duty Free 100.00 Duty Paid 128.00 
 
 43160. 
 43164. 
 
 Prepared Smoked Paper, in rolls 20 meters long 
 
 Sphygmograph, Lehmann, fur taking the radial pulse 
 
 43168. Cardiograph, Lehmann, for ape.x beat 
 
 Duly Ftoe 
 
 4^00 
 4.65 
 4.00 
 
 Duty Paid 
 1.00 
 .1. 00 
 6.00 
 5.00 
 
 43172. Pneumograph, Lehmann 
 
 43174. Portable Polygraph, Jaquet, new model, with interehange- 
 abli' writing points for both ink and smoked paper. 
 .Adjustable for speeds from 1 cm to 5 cm per second 
 and for continuous tracing with time marker for !,th 
 seconds. With three receiving tambours. In box 
 without attachments. 
 Duty Free 84.50 Duty Paid 109 .85 
 
 43176. Portable Polygraph, Jaquet, complete outfit consisting of 
 Polygraph as above with sphygmograph for radial 
 pulse, cardiograph for apex beat, receiving tambour 
 for carotid and two rolls of prepared "paper. 
 Duty Free 96.25 Duty Paid 125.15 
 
43180. 
 
 43182. 
 
 43184, 
 
 43188, 
 
 USKOFF SPHYGMOTONOGRAPH. The unique feature of this instrument is the simultaneous recording of 
 blood pressure in millimeters of mercury, together with the brachial pulse at varying pressures, and 
 one other tracing (jugular, carotid, apex beat, etc.) In other words, there are four tracings aponthe 
 paper, three of which are fixed by the limits of the apparatus, i. e. blood pressure in millimeters of 
 mercury, arterial pulsations at vnrii-",]'; rirr^'ii^ni-os and time tracing, while the fourth tracing may be 
 taken at will from such sources as < ■ ■ ■ ' ' i _i,hir, apex beat, etc. The instrument has been recently 
 remodeled and improved, particuhi : ii nidition of a continuous paper roll attachment, carry- 
 
 ing 20 meters of prepared smokerl p:i["j . w ii^i |] is now recommended for use with the instrument. The 
 instrument is now also provided with two speeds at the suggestion of Dr. Geo, W. Norris, of Phila- 
 delphia. See Kraus und Hirsck, Krankkeiien des Zirkulationsweges, in Fortschritte der gesnmten Medizin, 
 43, Johrgang II f. 1§1 and Dr. Lindemann Munchener Medizin. Wochenschrift Nr. 45. 1908f.SSS8. 
 Uskoff Sphygmotonograph, new model with two speeds and continuous paper roll attachment, including 
 von Recklinghausen's arm cuff and polished mahogany case and one box containing 20 meters of 
 smoked paper recording strips ready for use. 
 
 Duty Free 110.75 Duty Paid 145.00 
 
 Uskoff Sphygmotonograph as above, but with the addition of a receiving tambour with zero pressure 
 valve, four glass receivingtamboursfor jugular and other venous pulses, cardiograph attachment 
 for taking apex beat and two boxes smoked recording paper strips, 20 meters each. 
 
 Duty Free 120.00 Duty Paid 155.00 
 
 Continuous roll of smoked recording papers, 20 meters long 1.00 
 
 Glazed Paper Recording Strips, .'ilO mm long, for use with instruments not provided with con- 
 tiriiiouH roll att^ichment and which must be smoked before using 75 
 
 Curve Analyzer, Jaquet, for 
 
 the accurate measur- 
 ing and analysis of 
 tracings as taken i n 
 Physiological or other 
 work. See Jaquet, St u- 
 dien uber graphische 
 Z ei tregi stri erung. 
 Zeitsckrift fiir Biolo- 
 gie, Bd. XXVIII. 
 
 • Duty Free 68.75 
 
 Duly Paid 90.00 
 
ARTHUR 
 
 THOMAS COMPANY 
 
 EinthoTcn Siring Galvanometer wilh Illuminating System, Electrical Resiatancea, elc. No i1''lO Piiolo raphic Regiiler 
 
 EDELMANN LARGE ELECTRO-CARDIOGRAPHiC OUTFIT. It is impossible in thr brief spare at our dis- 
 posal in this catalogue to properly describe the component parts of a complete installation on the basis 
 of the large Eclelmann outfit. Complete German literature will be sent upon request to those inter- 
 ested and we give below a summary of the equipment. In the illustrations above L represents the 
 Arc Lamp, W the cooling cell, G the Einthovcn String Galvanometer with optical system, R, the Photo- 
 graphic Registering Apparatus and A and B the Wheatstone Bridge, electrical resistances, etc. The 
 equipment is divided into five principal parts, as follows: 
 
 1. Thread Galvanometer with accessories. DuIj- Free 
 
 Large String Galvanometer, Einthoven $245.00 
 
 4319G. 
 43200. 
 43204. 
 43208. 
 
 43212. 
 43216. 
 4.3220. 
 43224. 
 43228. 
 
 43232. 
 
 Zeiss Apochromatic Objective. 4mm, 
 
 " Achromatic Objective, DD 
 
 " Projection Ocular, No. 4 
 
 II. Illuminating Apparatus. 
 
 Hand Regulating Arc Lamp 
 
 Lamp Box, with condensing svstoiii 
 
 Rheostat, for 220 volts ; . / 
 
 110 
 
 1 and leg baths of zinc, 
 
 Water Cooling Cell 
 
 III. Electrodes. 
 Electrode Chair, consisting of a hospital chair with a 
 
 stands for arm baths, etc 
 
 IV. Electrical Equipment. 
 Outfit B, consisting of a Weston Normal Element, resistance of about 100,000 
 ohms, induction coil with telephone, various keys and commutators, slide 
 
 wire, rheostat, etc 
 
 V. Photographic Registering Apparatus. 
 Outfit C. Photographic Register for variable lengths of exposure and inter- 
 changeable box for records from 6 to 12 cm wide complete 
 
 Jaquet Graphic Chronometer 
 
 Negative Paper, 7o mflcrs long, 21 cm wide, per roll 
 
 G cm " " " 
 
 r Free 
 
 Dut,. Paid 
 
 >45.00 
 
 300.00 
 
 35.00 
 
 43.40 
 
 12..50 
 
 15.50 
 
 10.00 
 
 12.40 
 
 21.00 
 
 25.50 
 
 18.00 
 
 21.45 
 
 20.2.5 
 
 24.75 
 
 19.00 
 
 23.25 
 
 2.75 
 
 3.30 
 
 285.00 
 
 351.50 
 
 32.,50 
 
 46.00 
 
 15.00 
 
 18.00 
 
 7.25 
 
 9.00 
 
 Photographic Register, Dodge, for falling plates, taking 
 regular stock plates 13 x 18 cm. Recommended , 
 for use with String Galvanometers and similar 
 records or as a recording apparatus for smoked 
 paper. Furnished with an adjustable slit and 
 cylindrical lens with a vertical screen of fine plat- 
 inum wire 2 mm apart, which projects abscissae 
 of a directly photographed coordinate system. 
 The slit and cylindrical lens may be removed 
 when the apparatus is to be used as a smoked 
 paper recorder. The speed of the plate may be 
 varied instantly from 18 cm per hour to 18 cm 
 per second and records with the tatter speed may 
 be correctly read to j,\i„ second. 
 Duty Free 112.50 Duty Paid 150.00 
 
ARTHUR H. THOMAS COMPANY 
 
 
 
 27 10 
 
 17 1 
 
 iphic Apparatus in Posil 
 
 ELECTRO CARDIOGRAPHIC OUTFIT. Cambridge Scientific Instrument Company Outfit No. 2, reconinieuded 
 as a most complete instalhilinn fur irs(.>iirch laboratories and hospitals. Prices given are in English 
 currency and are f. o. b. < 'iunlnnlni'. England. Duty free and duty paid prices, f. o. b. Philadelphia, 
 are quoted on request. ( 'mniKnn m ]),iit.s are supplied at separate prices given. Numbers in text 
 refer to original C. H. I. Co. i.-iitaiusuo which is sent upon request. 
 
 4.3260. Einthoven String Galvanometer, consisting of No. 53112 field wound for 10 and £ s. d. 
 20 volts; No. 53151 Fibre Case with silvered glass fibre; optical system 
 consisting of Zeiss No. 12 compensating eye-piece No. 34633 and two 
 small diameter Zeiss objectives, i. e., 16 mm apochromat No. 34613 and 
 AA achromat No. 34623 
 
 43264. Spare Fibre Case, with fibre, No. 53151 
 
 43268, Double Fibre Case, permitting the simultaneous recording of both electro and 
 phonocardiograms on one plate and with but one galvanometer 
 
 43272. Battery. 10 volt, 50 ampere-hour, to excite galvanometer field. No. 53914. . , 
 
 43276. Plate Cameras, No. 53311, to take plates 7-2-x5 inches, 61x3^ inches, 18x13 
 cm and 17x8.5 cm, with three dark slides with 3doz. 6ix3|^inch plates.. 
 
 43280. Paper Camera, with 100 volt motor and reduction gear, No. 53334 
 
 43284. Automatic Projection Lantern, No, 53411, with series resistance for use on 
 110 volts. No. 53412 
 
 43288. Rotary Time Marker, consisting of synchronous motor, vibrating bar No. 
 53241, stand No. 53242 and spoked disc to give 5ths and 25ths of a sec- 
 ond, No. 53246 
 
 43292. Battery, 4 volt, 20 ampere hour, No. 53912, for use with above Time Marker 
 
 43296. Cardiograph Control Board, No. 53211 
 
 43300. Large Dry Ceil, for above. No. 53921 
 
 43304. Pair of Tables, to carry above apparatus, Nos 53353 and 53354 
 
 43308. Two Non-polarizable Hand Electrodes, "F" of illustration, immersion type, 
 No. .5-3511 
 
 43312. Two Insulated Wooden Stands, for above, No. 53515 
 
 43316. Non-polarizable Foot Electrode, immersion type. No. 53512 
 
 43320. Insulated Wooden Stand, for above. No. 53516 
 
 43324. Twin Flexible Cable, for various connections, No. 49326, twenty yards 
 
 4.3328. Button Insulators, for fixing above cable, No. 49388, three dozen 
 
 43332. Complete Outfit, as above 
 
 Additional Equipment Necessary for Taking Phono-Cardiograms. 
 
 43336. Special Transformer, No. 53611, with Sensitive Microphone on antivibration 
 suspension, etc.. No. 53612 
 
 43.340, Rheostat, to adjust primary current, resistance approximately 40 ohms, 
 No. 53931 
 
 43344. Accumulator, 4 volt, 20 ampere-hour, (u supply current for priinarv, No. 
 
 53912 ■ ' 
 
 Complete set of above accessories 
 
 39 
 
 13 
 
 11 
 
 £ 
 309 
 
 11 11 
 
 43348. 
 
 13 10 
 
ARTHUR H. THOMAS COMPANY 
 
 View of Prujedion Kuum in use as Slioivi 
 
43412. 
 43416. 
 
 43Ci2. 
 
 4:jj:{(;. 
 
 43140. 
 43444. 
 
 43448. 
 43ir)2. 
 434r,(i. 
 
 434W). 
 
 Pill Tiles, of glazi^d porcciidii, .squaie, with grailuations. 
 
 Size, inches _6^_ ^^ 
 
 Each 40 1.50 
 
 Pill Tiles, of plate glass, square, engraved on the under side to be read through the glass; with the 
 surface slightly roughened to hold pill mass while rolling; perfectly level and impervious to 
 grease. 
 
 aizc, inches 8x10 10x12 
 
 Each 1.50 2.00 
 
 Pins, Insect, Klaeger, special patent, black japanned steel pins. In packages of 100 and not sold in less 
 than 100 of a .size. 
 
 Number 000 _ _ 00-0 1-J 
 
 Per 100 ^ .25 -20 " .10 
 
 Pins, Insect, Klaeger "Miniitcn Kudrln," Ijlark, fi>r pinning small insects. Per 100 15 
 
 " " .'\. K. Co.'s indestructible. 
 
 Number 00-0 1^7 
 
 Per 100 30 .25 
 
 Pipe, Pure Block Tin, , .^^nv- i, 
 walls of iiir.limii iliirkn 
 Insido diaiiM-trr, il,^||^^ 
 
 Appioxiniatc wcigiil. per foot, ounces 3^ i ___p ^ !'■__ 
 
 Per lb 75 .75~ ~T7~5 .75 .75" 
 
 Pipe, Lead. Weights are given for walls of medium thickness. Other sizes or weights to order, 
 
 Inside diameter, inches 'i ig i s i 
 
 Appniximate weight per foot, ounces.. . , 16 10 20 32 36 
 
 Per lb 12 """ .12 .12 .12 A2 .12 
 
 Pipette, Dropping, 4 inches long, with straight top and bulb of ic<l, noa-bluoming rubber of superior 
 quality. Not to be confused with the ordinary medicine dropper. Per dozen 40 
 
 Pipette, Dropping, same as above but with curved tip. Per dozen 40 
 
 Pipette, Dropping, with glass tube of large bore and extra large rubber bulb, suitable for removing large 
 pieces of sediment, small embryos, etc. Each 10 
 
 Pipettes, Dropping, straight, without bulb. Length, mm 200 300 
 
 Each "^05 .07 
 
 Pipettes, Dropping, same as above but with black rubber bulb about 20 cc capacity. 
 
 Length, nnu ^00 300 
 
 Each 15 .20 
 
 Pipette, Dropping, Automatic, with rubber bulb. Very convenient for filling ampoules with repeated 
 doses of 1 cc. Each 1.00 
 
 Pipettes, Automatic, with three-way stopcock. Capacity, cc 10 2o 50 100 
 
 Each 2.25 2^75 3^00 4^ 
 
 Pipette, Double Automatic, Friedrichs, with stopcock, so made that one pipette fills while the other 
 
 empties. Capacity, cc 2.5 50 100 
 
 Each (5.75 7.00 7.75 
 
 Pipette, Double Automatic, Rothc, (or the raiiid dc(ci-niirKiti<m nf iron by the ellier method 12.00 
 
 412 
 
 lit for laboratory connections, water worms, etc. Weights given are for 
 s. Other sizes or weights to order. 
 
 .75 
 1 
 
43464. 
 43468. 
 43472. 
 43473. 
 43476. 
 43480. 
 43484. 
 43488. 
 
 43.516. 
 43520. 
 43524. 
 
 No J3472 No JilTC No. 43J8S No. 13192 No. |:tnili No. 4-350 1 No. 13308 No. 4 
 
 /\ 
 
 i Y V 
 
 Pipette, Mercury, foi- taking up dropK wi 
 Pipette, Mercury, for the convenient ha 
 Mercury Pipette, Heerwagen, for delivi 
 Extra Glass Tubes, for above, wi 
 Pipette, Ostwald, for catibratins, '2 rr., ■• 
 " " as above, witli ,'. 
 
 Pipettes, Mohr, accurately gradiuiti 'I m 
 
 Capacity, cc y6 ^ 
 
 Graduated to, cc i-j-g ri 
 
 Each .35 .25 
 
 Pipettes, Mohr, with glass stopcock. 
 
 Graduated to, cc 
 
 Each,, 
 
 if wame entering the mouth 
 
 I drops of mercury 
 
 uantities of mercury, on stand with clamp. 
 
 IS over and under the upper mar 
 Llimcters and fractions thereof. 
 
 Capacity, cc 25 
 
 1.75 
 
 extreme tip. 
 
 vtended to the 
 
 .30 
 
 .30 
 
 2.00 
 
 .50 
 
 . .75 
 . .75 
 . .65 
 
 50 
 
 1.20 
 
 50 
 _^ 
 2.00 
 
 .45 
 
 Pipettes, Serological, same as Xo. 434SS but with graduations ( 
 
 Capacity, cc -lo 
 
 Graduated to, cc TJg 
 
 Each _. 35 ^ 
 
 Pipettes, Graduated, Stokes These pipettes are graduated to the tip and are of accurate specifications 
 as to total length of graduations, inside and outside diameter, etc. The total length of the 1 cc 
 
 pipette is 170 mm ami of the 15 cc pipette 334 mm. Capacity, cc 1 15 
 
 Graduated to, cc -^ tV 
 
 Each 25 M 
 
 Pipettes, Volume or Transfer, with bulb in middle of tulje ami acrurately graduated to capacities named. 
 
 Capacity, cc 1 2 3 4 5 10 15 
 
 Each iT AI ~A2 J4 ' ^J5 A7 ^ 
 
 Capacity, cc 20 
 
 Each .26 
 
 Pipettes, Volume or Transfer, with bulb low on tube, accurately graduated to capacities named. 
 
 25 
 
 .25 
 
 50 
 
 .35 
 
 75 
 
 .40 
 
 100 
 
 _200 
 .75 
 
 200 
 
 Capacity, ce _ 5 _L0_ _ 20_ _ 25 _50 _ 100 
 
 Each 15 ' .20 " .25 .30 .40 .50 " ^70 
 
 Pipettes, Volume or Transfer, without bulb, as used in bacteriological work, water analysis, etc. 
 
 Capacity, cc 1 5 10 
 
 Each lO" ' .15~ ' ~ .20 
 
 Pipette, Spencer, for glucose, 50 cr .- ■:. liii[> m ]-ii-ix scale from 5 to 20° in iths 1.50 
 
 " " " sucrose, ca]<ii' !■ "J ■ i-, reading in Brix scale from 5-25° in -^ths 1,75 
 
 Pipettes, Graduated, designed parhiiuru I \ luc use in water analysis and as u,sed in the Hygienic Lab- 
 oratory of the U. S. Public Healtii .-ieivice for this purpose. The 11 cc pipette has mark at 0, 
 10 and 11 cc only ; the 10 cc pipette is graduated from to 10 cc n single cc ; the 2 cc pipette is 
 graduated from to 1 cc in yV^hs and is ungraduated from the 1 cc mark to 2 cc. 
 
 Capacity, cc 11 10 2 
 
 Each 725 ~^5" ^ 
 
 Pipette, Capillary, for use in preparing milk smears for microscopical counting of bacteria. Grad- 
 uated to T,',„ cc with one mark. With a Bausch and Lomb 6.4X ocular and a 1.9 mm oil immer- 
 sion objective and a tube length of 195 mm, the apparent field covers approximately y^na sq. 
 cm. which gives a convenient factor for computation. See Bulletins S73 and S7S of the, New 
 York Experiment Station .' 1.00 
 
ARTHUR H. THOMAS COMPANY 
 
 43376 43580 
 
 43;>32, Pipette, Weichardt Hygienic, for bacteriological and serological work. With air filter in metal capsule 
 and screw adjustment to control delivery of small drops. Capacity, j^ce in , J„ths 3.00 
 
 43536. Pipette, Wassermann Safety, for bacteriological and serological work. The glass cap with tubulation 
 is withdrawn with finger over the opening, thus falling the pipette. Withdrawal of the finger 
 from the tabulation provides exact control of the delivery. With pipette ^cc in jj^ths, gradu- 
 ated to tip 75 
 
 43.'>40. Pipette. Syringe, Woithe, for bacteriological and serological work. Complete with precision pipette Ice 
 in ,,',7Tths 6.00 
 
 43544. Syringe only for above 5.25 
 
 43.'>48, Pipette Safety, Permin, for bacteriological and serological work. Capacily cc to 1 
 
 (iraduated to, cc _. , ',7,- fi-^j 
 
 Each " ~775 TTlO 
 
 PIPETTES, PRECISION, graduated by weighing at 20" C. in aicnrdance with the specifications of the Physik- 
 alisch-Technische Reichsanstalt «il )i iiidi\iilii:il rtinl rul iiiimhcr, etr. These pipettes are offered with 
 our unolhcial factory certificate ami. in ailililiun, with I. lie I'hysikaMscli-Teehni.schc Reichsanstalt cer- 
 tificate and control stamp, i.e., the official certificate of tht; Ocrnian guvciiiment. 
 
 Precision Pipettes with Unofficial Factory Certificate. 
 
 ■ertificates are made out in the factory in exact accordance with the methods used bv the 
 
 Physikalisch-Technlsehe Reichs; 
 
 d:i 
 
 perniilled hv the J'. 'I", R. 
 
 calilpRilerl in tlic hil.onitnry or wllh .'iiiu. i 
 
 Pipettes, Mohr, Precision, with nnrillii-i:ii i i 
 
 Capacity, cc 
 
 Graduated to, cc 
 
 Each 
 
 Pipettes, Volume or Transfer, Precision, wi 
 
 Capacity, ce I 2 
 
 Each .40 .40 
 
 certified unless the error falls within the linnt 
 cw may be used as a check where pipettes are 
 I the accuracy of the figures given. 
 
 1 
 
 2 
 
 2 
 
 ,i 
 
 10 
 
 25 
 
 50 
 
 A 
 
 ■}„ 
 
 A 
 
 A 
 
 A 
 
 A 
 
 A 
 
 .so 
 
 1 .00 
 
 x 
 
 l.ln 
 
 1.25 
 
 1.75 
 
 .1.00 
 
 V ccr 
 
 lEicaf 
 
 
 
 
 
 
 1.". 
 
 20 
 
 ■_'.i 
 
 31) 
 
 .'lO 
 
 100 
 
 2IM 
 
 Tljc 
 
 Precision Pipettes, 
 
 p ])ipetti'saroe.\af'tlv I 
 lunii.sljcl ivilli llie .jffici.ll I'liVs 
 ivliicli aliiBlu-riirii'" inusi 1... rl,i, 
 Pipettes. Mohr, Precision, willi I 
 
 I .40 .1.1 .4.1 ..10 ..'>5 .00 .70 .SO .90 1.15 1.60 
 
 ilh Ph> sil.alisch-Technische Reichsanstalt Certificate. 
 
 (■ - iijM :i, hi.s,. described above in workmanship and .accuracy but are 
 iaiisrii 111 lini.sclie Ileichsanstalt certificate and control stamp, for 
 iji'il lii'i-aiisr 111' liic ('icrinan tiovernmcnt fee. 
 
 1 
 
 1 
 
 Pipettes, Volume or Transfer, Precision. 
 
 Capacity. 
 Each, 
 
 3.00 3.00 3.10 
 
 litli P. T, R, certificate, 
 
 ,', _J,_ 10 15 20 
 
 i.fio 
 
 10 25 
 
 3.45 5.25 
 
 .50 100 
 
 .50 
 
 A 
 
 G.20 
 
 1.50 
 
 1.65 
 
 .70 1.75 1.80 
 
 1.50 1.50 1.50 
 
 Pipettes, Serological, Precision, with graduations extended to the tip. Recommended whe 
 
 accuracy is required; with P. T. R. certificate. Capacity, cc A 1 
 
 Cradualcd to. cc i .', ,, A 
 
 Each 3,00 3,00 
 
 1.95 2.40 3.10 
 
 great 
 
H O M 
 
 PIPETTES, PRECISION, as used in the HjBienU I.alniratorj of Ihr II, S. Piiblir Health Service lr,i ,lrl 
 
 ing the immunity unit in thestanrlanlizal ion <ii iliplii In 
 No. SI. These pipettes are standardized at Jd" ( '. 
 of Standards but are ret^ularly fui-nislu^il wilhout 
 eitlier the liureau of Standards oi ll,. I'ln ^iik.ih,,, 
 
 Outside diaiiieter "f the l.ulli. 
 
 ided . 
 
 I<< 
 
 vl.t 
 
 . ;;,.//, / 
 
 order only. 
 3e with spe- 
 
 43572. Pipette Volumetric, Precision, jiradiialed hiilelnn i , 
 
 is su|i|jlied witli two eteiied bands near toji 
 43.>7I>. Pipettes, Volumetric, Precision, as above, gradualed I 
 
 Capai-ily, ,T ... 1 2 3 I 
 
 Each .7.5 
 
 4.3.'i80. Pipettes, Gratluated, Precision, so 
 
 (iraduated from 
 
 Each 
 
 ji],iilatian this pipette 
 
 43388. 
 4.3.>92. 
 
 43600. 
 
 431104. 
 43608. 
 43612. 
 43616. 
 43620. 
 
 Pipette Box, tor teiiliziiif, t ipettes 
 
 inelies m iiamctei \ > If inches Ins; 
 about 13 of tile same 10 ec in -iVth; 
 
 Pipette Box, same as above but of sheet iron 
 
 ul |iulis!ied copper, with tightly fitting lid, 2j 
 Will t:ike aboid 7."i graduated pipettes, 1 cc in ^oths or 
 
 1.75 
 
 _,_ _„_,., 1.25 
 
 ' rectanguTar form, for sterilizing pipettes in bacteriological worlv, of copper. 
 
 Size, inches I f x 2 j x 10 Ij x 2^ x 16 
 
 Each 
 
 Pipette Box, same as above but of sheet iron. 
 
 Size, inches 
 
 1.75 
 
 Each., 
 
 l|^x 2J X 10_ 
 1.25 
 
 2.50 
 
 1> X 25 X 16 
 
 1.50 
 
 Pipette Box, for sterilizing ami transporting pipettes, with lid and removable end; of brass, nielcel 
 
 plated, with asbestos lining; 2 inches deep by 4 inches wide by 16 inches long 7.50 
 
 Pipette Support, of brass, niclcel plated 1-75 
 
 Pipette Rest, wdth ground glass surface for writing 3.00 
 
 " " of porcelain, for pipettes, stirrers, etc., 75 x 65 mm 75 
 
 Pipette Support, of poli-hed hardwood, revolving , • , ,, -, ■ - ■ 2.50 
 
 Pipette Support, for 24 pipettes, perforated discs are of polished wood, upright support of brass and 
 base of glazed porcelain 
 
 5.50 
 
43704. 
 
 4.370S. 
 
 43712. 
 
 437 l(i. 
 43720. 
 43724. 
 
 43728. 
 
 43732. 
 43730. 
 
 43740. 
 43744. 
 43748. 
 43752. 
 
 PHYSIOLOGY APPARATUS, GANONG. The apparatus here listed has been devclopea during a 
 period of ten years bj^ Prof. W. F. Ganong, of Smith College, and manufactured by the Bausch it Lomb 
 Optical Company. A special catalogue entitled, "Ganong Botanical Apparatus fur use in Pianl Phys- 
 iology," 53 pp. with introduction and descriptions of the apparatus with method of use, by Prof. 
 Ganong, is sent on application. The use of the apparatus finds fuller descriptions in Ganong, "A 
 Lahuratorv '''"'iry^c in Pl'-ni /''' .■ .■■.■■'"./■. '■ Henry Holt & Co., New York and Ganong, "The Teachinq 
 j'.nUnu.l," tlicMacniillai, ( ■■ .:■■.. ■■■k. 
 
 Aluminum Shells, for tr;iii.- !■ i 1 1 1 iniiments, consisting of shell with band and screw as shown in 
 
 illustration, ijut i\ itli'^i il i ii/jrn j luof. Diameter, inches 3 4 5 
 
 Each "l."25 TjS 2^5 
 
 Rubber Tissue, medium thickness, for use as roofs. Per ounce 30 
 
 Anoxyscope. Demonstration, for showing the necessity for oxygen in plant growth. Complete with 
 
 -5 o/.. nf rau.^tic. iiotash and 1 oz. of pyrogallic acid 4.25 
 
 Auxograph, Deiiiim.stratlon, for recording the rate and amount of growth. Complete with chain attach- 
 
 ]ll. In 
 
 nl;u 
 
 25.00 
 
 n--; ' Mind-T 1.50 
 
 ■'ii jl. platebutwithoutbell jar and Potometer as shown in illustration. 10.00 
 
 "I '^ Jinplete with two hole rubber stopper and glass tubes 3.25 
 
 lit-jnniiT, Jill demonstrating the release of heat in respiration. Complete with 
 
 y'-\\ ui bulbs, 500 cc, with thermometers and wooden support 18.00 
 
 Idr, for use with Demonstration Clinostat, complete with two rods 8.00 
 
 ation, for use either obliquely or horizontally in connection with the Clamp Stand 
 iiwi''i ^Vlll I'l! '■ :t I inch pot but operates with greater accuracy with a pot 3 inches in 
 I' I'. ' .1 I i-li 1 1 ■ I It idockwork with disc, screw rods, spindle arm and extensible support, 
 
 iIIm-ui I I . , I -I , ,1 22.50 
 
 s TuIh's, Imi ill inniistj-ation of the percentage of carbon dioxide contained in a sample of 
 gas. With two reagent tubes, suitable rubber connections and graduated stopcock gas tube. 2.00 
 Leaf Area Cutter, for demonstrating the increase of organic substances through photosynthesis. With 
 
 two cups, test tube and holder for same 12.00 
 
 Leaf Clasp, for applying special treatment to two exactly corresponding areas on the leaf surface as, 
 for instance, Stahl's cobalt chloride method in the study of transpiration. Without support 6.50 
 Support, for above 35 
 
 Extra Record 
 Bell Jar Support, i- 1 
 
 Bell Jar, oiil- 
 Caloriscope and <'al 
 
 two sd\-ered 
 Clamp Stand, }inrl: 
 Clinostat, Demonsti 
 
 above lisir,! 
 diaiiii'li'i', ' 'i 
 but iMilinul I 
 
 Gas Analys 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 43756 No. 4VXA No. r.inii No. l^VfiS 
 
 43756. Light Screen, wIidIc luai' form, with screen box with adjustable clainp, 7x7 clear glass plate with 
 ground edges, two half plates with ground edges and 1 sq. ft. of tin foil, but without color screen 
 
 bottles and support 9.00 
 
 43760. Support, for above 35 
 
 437ii4. Light Screen, part leaf form, as shown in illustration, with ^ sq. ft. of thin tin foil 1.25 
 
 43768. Manometer, Demonstration Root-pressure, showing the force with which roots start the sap up the 
 stems. With clamp and vertical support, 2 inches of rubber tubing, two feet of tire tape, 1 oz. 
 
 of stopcock wax and 10 cc of mercury 4.75 
 
 43772, Manometer, Normal, for measuring liquid pressure, particularly osmotic pressure, etc. With two 
 }i;lass sleeves, rubber tubing and tire tape for connections, 2 cc of mercury and 1 oz. of shellac 
 
 for sealing 1.50 
 
 43776. Osmoscope, Demonstration, to show osmotic absorption before the class. With support and clamps, 
 
 storage bottle and two extra lengths of parchment paper tubing 4.25 
 
 43780. Photosyn thorn eter, for accurate measurement of the absorption of carbon dioxide by green plants in 
 light with the equivolumetric release of oxygen. Complete with reagent tubes, rubber con- 
 nections, clamps and cylinder but without support and clamp 5.25 
 
 Support and Clamp, for above 75 
 
 43784. Potometer, for the quantitative determination of transpiration by the measurement of water absorp- 
 tion by a cut shoot. With split rubber stopper, 1 oz. of stopcock wax, vial and slide piece. 3.75 
 43788. Kespirometer, for demonstrating and measuring the gas exchanges in typical respiring material as, 
 
 for instance, in germinating seeds. With rubber connection, two clamps and support 8.25 
 
 43792. Respiroscope, Demonstration, for showing the elimination of carbon dioxide to large classes. With 
 
 1 oz. of calcic oxide and 1 liter bottle for limewater 4.50 
 
 43796. Space Marker, Root and Stem 1.00 
 
 43800. " " Leaf 2.00 
 
43,S12. 
 43S16. 
 43820. 
 
 43824. 
 
 4.3828. 
 43832. 
 43840. 
 43844. 
 43848. 
 
 Spectroscope I s g 
 
 e e E^ r lati t 
 
 I I 1 
 
 Tenp r ture St e I 
 t I 
 
 Tierm n eter I 
 Spir t Lamp t I 
 
 Tran p rat on Balance 1 
 Dut> Free 
 
 Tran p r graph 
 
 W 1 1 ) 1 li I 
 
 Record Paper ] 
 
 Water ( ulture \e el 
 Tunbltr 
 
 ^--^Jl& 
 
 t <5how tie absorption spectrum nf , 
 tletisj Consisting of Brownini; 
 
 t 1 vial 
 
 pe to show the relation of tl 
 \\ tl clamp and felt mat but \\-i\ 
 
 yll ill the study of the 
 isiou ftipoct rose ope with 
 
 24.50 
 
 of protoplasmic stream- 
 ither accessories. . . 4.00 
 1.50 
 
 I 
 
 ;Ltioi 
 
 L weight as an at 
 ■ for both demo; 
 
 45 
 
 of transpiration. 
 80.00 
 
 istiatioiis ani.1 investigations. 
 
 I 1 I"'!-: 75.00 
 
 25 
 
 \lu Tl um Double Support 1.75 
 
 th t It I ai over 10 
 
 Paraffine f I for o t ng the upi o ts, per lb. , 
 
 Lan pbHck i c lb 
 
 .20 
 .12 
 
ARTHUR H. THOMAS COMPANY 
 
 ^^/ 
 
 No. )J<I64 
 
 =/ '' 
 
 43900. 
 43904. 
 43908. 
 
 43912. 
 43910. 
 43920. 
 43924. 
 
 43928. 
 
 43932. 
 
 43936. 
 43940. 
 
 43944. 
 43948. 
 
 43956. 
 43960. 
 
 • ir, .25 
 
 1.50 200 
 
 .18 " .30 
 
 I. Cunvenient for 
 
 12.0 
 
 Plates, Glass, cirouiar, plain, edges not ground. 
 
 Diameter, mm 75 iQO 150 200 
 
 Each _. 06 .OS 
 
 Plates, Glass, circular, ground on one side, edges not ground. 
 
 Diameter, ram "5 IQQ 
 
 Each .08 ~ .10 
 
 Plates, Glass, with edges slightly ground and hole in center to admit stirring n. 
 
 use as covers. 
 
 Diameter, mm 75 100 
 
 Each 25 .30 
 
 Plates, Glass, same as above but with hole at one edge. 
 
 Diameter, mm 75 100 
 
 Each 25 ~~Z<i 
 
 Plates, Glass, square, plain, edges not ground. 
 
 Size, nun '. 75 100 
 
 Each ,03 .04 
 
 Plates, Glass, square, ground on one side, edges not ground. 
 
 Size, mm 75 
 
 Each ~1m 
 
 Plates, Heavy Plate Glass, square, ground on one side, edges not ground. 
 
 Size, mm 150 175 200 
 
 Each 30 .35 .40 
 
 Plates, Heavy Plate Glass, square, ground on one side, with edges ground. 
 
 Size, mm 150 175 200 
 
 Each 35 745 755 
 
 Plates, Blue Glass, so-called "Cobalt" glasses, for observing the potassium flame; edges not ground. 
 
 Size, mm 50 x .50 50 x 75 75 x 75 50 x 100 75 x 100 100 x 100 
 
 Each 04 .05 .06~ .06 .08 .10 
 
 Plates, Glass, 200 x 100 mm, of finest plate glass 7 to 8 mm thick, with one end finished in pitch 
 
 black and the other in pure white. For examination of sputum, feces, etc .75 
 
 Plates, Porcelain, perforated, for use in funnels. 
 
 Diameter, mm 25 38 50 75 100 125 150 175 
 
 Each .15 .20 .25 ^40 .60 .75 " 1.00 1.00 
 
 Plates, Royal Berlin Porcelain, for color reactions, 110 x 90 mm, with twelve concavities. Very 
 
 superior tn the common porcelain plate usually supplied 75 
 
 Plates, Opaque Fused Silica, unglazed, preferable for use as heating plates to wire gauze on account 
 
 of their cleanliness and absolute resistance to corrosion. Will stand extreme changes of temper- 
 ature without cracking. 
 
 Size, inches 3x3 
 
 Each, I inch thick .27 
 
 Each, \ inch thick 54 
 
 Plates, Opaque Fused Silica, glazed throughout, j inch thick. 
 
 Size, inches 3x3 
 
 Each 
 
 .50 
 
 225 
 
 15(1 
 
 200 
 
 .08 
 
 .16 
 
 loO 
 
 200 
 
 .10 
 
 .20 
 
 250 
 
 300 
 
 .80 
 
 1.00 
 
 250 
 
 300 
 1.25 
 
 4x4 
 
 4.x 4 
 
 6x8 
 l.OS 
 2.1G 
 
 6x6 
 
 9jt9 
 2.43 ' 
 4.8G 
 
 9x9 
 
 12 X 12 
 4.32 
 S.G4 
 
 12:^12 
 11.25 
 
 Plates, Porous, circular, for drying crystals and precipitates, 250 mm diameter 15 
 
 " " square, for drying crystals and precipitates. 
 
 Kize, mm '. 1^50 _ 200 300 40 
 
 Each 25 .55 1.25 3.00 
 
 Plate, Streak, Royal Berlin Porcelain, unglazed, as used for arsenic test and by mineralogists; 100 x 65 
 mm 45 
 
ARTHUR 
 
 PLATINUM WARE 
 
 thou 
 
 e nse ed f o n t ne o t 
 
 ware frijin selected factor es in both Europe and 
 hie us to offer it at the current daily quotations 
 n be furnished immediately from our own stock and 
 e or four days. Approximate weights are given 
 n classifications of ware used in the platinum trade 
 gues are sent out. 
 
 The Care of Plat num Ware. 
 
 nd am. Heft U. expliii 
 hp deatrufitLon of platirm 
 ishe^ ivLTe not exposed M 
 
 the cauaea o/ the deatruction of placi- 
 ware (which ia alwaya only a chemical 
 innicessarily high temperatures during 
 
 >h u akea place only when the diffurent salts are reduced at compara- 
 
 i a b li e annealing acKelenite.^ the retiuctiona considerably. When the 
 
 shou d b taken for obvious reasons, tliat there ia no reducing atmosphere in 
 
 n w e a so harmful to the piatinum. 
 
 np res and tlie annealing over a blowpipe or in a furnace only when 
 
 m eadily attacked when thp melting of alkaline or alkali carbonate 
 
 ini'aled in plat 
 
 : the s: 
 
 I- be 31 
 
 44008. 
 44012. 
 
 44020. 
 44024. 
 
 44028. 
 
 440-32. 
 
 44036. 
 
 Thickness, mm 
 
 " inches 
 
 Approximate weightper stiuare inch, grams 
 
 Platinum Wire. Platinum loojis for chemical laboratory work 
 plafiuuji) inuoculating needles for bacteriological work, 
 '■ouiiiicrid Xo. 24. All weights given are approximate. 
 
 B, A: S. naiige :. "l2 14 IG 
 
 Diameter, indies. Osfl 
 
 " mm 2 021 
 
 Weight per foot, grams 21 27 
 
 B. & S. gauge 2") 
 
 Diameter, inches , , 017 
 
 mm 431 
 
 Weiijht per foot, grams 97 
 
 Platinum Wire, special for calorinietry. c 
 Anodes. Style 
 
 No. 4402S No. 41032 No 44036 
 
 nd can be furnished in any length up to 24 inches. 
 Light Aledium Heavy 
 
 03 .04 .05 
 
 OOllfi .00157 .00196 
 
 853 ..5.30 .705 
 
 re usually made of No. 26 wire, as are 
 For a stiff innoculating needle we re- 
 
 IS 
 
 20 
 
 (1114 
 
 0.50 
 
 (L'o 
 
 1 260 
 
 :) , i;2 
 
 S 31 
 
 ■X 
 
 27 
 
 .015 
 
 .014 
 
 3S0 
 
 ,3,55 
 
 ,040 
 
 ,031 
 
 1,015 
 
 ,787 
 
 5,36 
 
 3,20 
 
 28 
 
 30 
 
 ,012 
 
 ,010 
 
 304 
 
 ,253 
 
 Hci 
 
 22 
 .025 
 .634 
 2. OS 
 
 32 
 .008 
 203 
 .213 
 
 B 
 150 
 50 
 
 24 
 .020 
 .507 
 1.33 
 
 36 
 .005 
 .126 
 
 IJiiiiiiptri' i]f spiral, tnm 2 
 
 .Approximale weight, grams 5-6 20 8-10 
 
 Platinum Cathodes. Style .\ B C 
 
 Diameter, mm 57 25 25 
 
 Length of stem, mm 75 75 75 
 
 Approximate weight, grams 20 12 12 
 
 Platinum Gauze Cathode with wire frame Anode. Approximate weight 49 to 45 grams. 
 
 Platinum Electrode, with open gauze cylinder. Height 2 inches, diameter 1 inch, of 52 mesh gauze. 
 Approximate weight 12 grams. 
 
 Platinum Electrode, with rlosod gauze cylinder. Height 2 inches, diameter 1 inch, of 52 mesh gauze. 
 Approximate weight 10 grams. 
 
 Platinum Electrode, w ith rotatiTig gauze cylinder. Height 2 inches, diameter 1 inch, of 52 mesh gauze. 
 Approximate weight 15 grams. 
 
 Platinum Electrode, with [)erforated sheet eyliniler. Height 2 inches, diameter 1 inch. Approximate 
 weight 17 grams. 
 
2i ?> Z\ 
 
 ,5 S.5 10 " 
 
 , approximate weifiht 3ij 
 
 12 
 grams; 
 
 4404n. Platinum Combustion Boats. 
 
 Lenf2;th, inches U 2 
 
 Approximate weight, grams 3.0 4 
 
 44044. Platinum Combustion Boats, Blair, -^^ inches dettp by oj inches lon^ 
 with or without cover. 
 
 44048. Platinum Combustion Tube, seamless, with German silver fittings. As used in iron and steel analysis. 
 Made in any desired length or in special shapes according to specifications, 
 
 44052, Platinum Filter Cones, seamless, with perforations .020 inches in diameter. 
 
 Diameter, inches f s 1 H 1^" 
 
 Approximate weight, grams 1.0 1.5 2.5 4.0 GO 
 
 440.51). Platinum Crucibles. Covers are always furnished unless otherwise ordered. 
 
 Number 1 2 2 4 5 6 7 8 
 
 Capacity, cc _8 10__ 15 20 _ 25_ 30 40 50 _ 
 
 Approximate weight, grams S 10 15 20 25 30 " 40 '56 
 
 440()0. Platinum Crucibles, Gooch form; weight includes cover and cap. 
 
 Capacity, cc 10 lo 20 25 
 
 Approximate weight, grams 13 18 24 29 
 
 44064, Platinum Crucible, Gooch, low form, with bottom permanently fixed, as used in asphalt and 
 analysis; capacity 30 ce, approximate weight 30 grams. 
 
 440(i8. Platinum Incinerating Pan, rectangular shape, with flat bottom. 
 
 Capacit\ c 15 
 
 Approximate weight grams 10 
 
 ' 8.0 
 
 2 
 
 12.0 
 
 9 10 
 
 GO 70 
 
 "60 70 
 
 44072. Platinum Dish, flat bottom, with straight sides and without lip, as used in milk analysis, capacity 45 
 
 cc, approximate weight 17 grams, 
 44076. Platinum Dish, without lip, as used in wine and water analysis; capacity 100 cc, approximate weight 
 
 20 grams. 
 44OS0. Platinum Dish, with Up, as used in water analysis and iron and steel work, 45 cc capacity, approximate 
 
 weight IG grams. 
 44084. Platinum Dish, Payne, flat bottom, with wire rim and lip, as used in fertilizer analysis; capacity 100 cc, 
 
 approximate weight 40 grams. 
 44088. Platinum Dish, with flat bottom and straight sides, with lip, as used in sugar analysis; 35 cc capacity, 
 
 approximate weight 16 grams. 
 44092. Platinum Dish, round bottom, without lip, as used in sugar analysis. 
 
 Capacity 20_ 25 
 
 Approximate weight, grams 10 12 
 
 44096. Platinum Dish, flat bottom, with handle and without lip. As used in sugar analysis. This dish is also 
 
 made for sugar work without handle and with lip. Please specify in ordering. 
 
 Capacity, cc 10 20 25_ 35 
 
 Approximate weight, grams 10 14 18 20 
 
 44100. Platinum Dish, deep form, with handle, as used in sugar analysis. Also used in sugar work with lip and 
 
 without handle. Please specify form in ordering. Capacity 30 cc, approximate weight 16 grama. 
 44104. Platinum Dish, deep form, with two handles and lip. Capacity 45 cc, approximate weight 15 grams. 
 
ARTHUR H. THOMAS COMPANY 
 
 Platinum Dish, wUh flat Ijuttom and straight sides, with lip. 
 
 (.ajKirity, cc 80 100 125 
 
 Approximate weight, grams 32 35 40 
 
 Platinum Dish, Blair, flat bottom, with or without lip, with either wire rim c 
 
 iron and steel analysis. Capacity, i\- 
 
 Approximate weight, grams 
 
 PlatinumDishes,\vitlili|]. Capacity, cc Li 'JO 2.t 35 
 
 Approximate weight, grams ;i f> " "s ~io ~ 
 
 Capacity, (■■<.■ tOO 125 150_ _ 175 
 
 Approximate weight, grams 33 42 5(J 55 
 
 Platinum Dish, Classen, for electrolytic separation, with either prilished oi ^iml 1.1 jstcd inner suifice 
 
 Capacity 250 cc, approximate weight 40 grams. 
 
 200 
 
 250 300 
 
 56 
 
 70 SO 
 
 r solid 
 
 nm. As used in 
 
 280 
 
 380 525 
 
 80 
 
 100 120 
 
 .30 
 
 65 75 
 
 17 
 
 22 25 
 
 200 
 
 250 300 
 
 07 
 
 SO 100 
 
 ;J131 No. 11128 No. 
 
 Square 
 
 »'"4fii}++t-«'** 
 
 1 1 1 
 
 I's lung, approximate weii^ht 7 5 grams. 
 L luLniJIc. Approximately same weight. 
 
 44124. Platinum Spatula, round end or square end, 
 
 44128. " " same as above, but with \ _. 
 
 44140. Platinum Triangles, with either twisted or solid ends. 
 
 To take crucible, cc 10 _ 15 _ 20 25 30_ 40_ 50 60 
 
 Approximate weight, grams 5.0 7.0 io.5 12,0 12,0~~14.0~16,0 1S."6 
 
 44144. Platinum Pan, with holder, for calorimetry. Weight of pan 5 grams, weight of holder 6 grams. 
 
 44148. Platinum Wire Gauze. Mesh 52 
 
 Diameter of wire, inches 004 
 
 Approximate weight per square inch, grams 550 ] 
 
 44156. Platinum Blowpipe Tips, as illustrated, types A, B or C. 
 
 70 
 20.0 
 
ARTHUR H. THOMAS COMPANY 
 
 44224. 
 44228. 
 44232. 
 
 44236. 
 44240. 
 
 .20 
 
 , etc. 
 
 .20 
 
 Pliers feteel witl ] omtc I i 
 
 Length, m he^ 
 
 Each 
 
 Pliers, steel, with flat nose. 
 
 T,ength, inches 
 
 Each..... 
 
 Pliers, steel, with iiat nose, side cutting. 
 
 Length, inches 
 
 Each 
 
 Pliers, steel, with round nose. For bending 
 
 Length, inches 
 
 Each 
 
 Pliers, steel, end cutting. 
 
 Length, inches 4 
 
 Each .70 
 
 Pliers, steel, with diagonal jaws for cutting. 
 
 Length, inches 4 
 
 Each 75 
 
 Pliers, Button, straight, for holding buttons while brushing, 5 inches long 
 
 Pliers, gas tongs or pipe wrench, 8 inches long 
 
 Pneumatic Troughs, of heavy glass. 
 
 Length, mm 250 
 
 Width, mm 150 
 
 Height, mm 150 
 
 Each 2.50 
 
 .30 
 
 .35 
 
 6 
 
 8 
 
 .80 
 
 1.40 
 
 5 
 
 6 
 
 .30 
 
 .35 
 
 5 
 
 6 
 
 .75 
 
 .85 
 
 5 
 
 6 
 
 300 
 200 
 150^ 
 4.00 
 
 Cylindrical Shelf for pneumatic troughs, so-called "Beehive," of glass, 72 mm high by 104 mm 
 eter 
 
 350 
 250 
 160 
 5.50 
 diam- 
 ,. .50 
 
 Pneumatic Troughs, of japanned tin, with sliding shelf and overflow. 
 
 Length, inches 10 10 12 15 18 
 
 Width, inches 7 7 9 11 12 
 
 Height, inches 4 5 5 €> 8 
 
 Each ~lT25 1.35 1.50 2.00 '~3.06 
 
 Porcelain Shelf for pneumatic troughs, of glazed porcelain with radiating lugs on the top, tubula- 
 tion for rubber tubing and three supporting legs. The tubulation connects with the center 
 opening only. Method of use is shown in illustration 1.25 
 
ARTHUR H. THOMAS COMPANY 
 
 POLARISCOPES 
 
 For Urine Analysis 
 
 For General Purposes 
 
 For Sugar Analysis 
 
 -^1^ 
 
 Polariscopes for Urine Analysis. 
 
 Polariscope, Ultzmann, for urine analysis by means of either day or lamp light. With a tube of spe- 
 cial length so that the angular rotation in degrees is equivalent to 1% glucose content. By means 
 of verniers readings are made to ^%. Complete with support as shown in illustration. 
 Duty Free 28.50 Stock 38.00 
 
 Extra Glass Tube for urine work. 
 
 Duty Free 2.10 Stock 3.50 
 
 Extra Glass Tube of 200 mm length by the use of which this instrument maybe used for purposes other 
 than urine analysis for substances where the specific rotary power is within the limits of the 
 rotary scale. 
 Duty Free 2.10 Stock 3.50 
 
 Polariscope, Schmidt & Haensch, Mitscherlich, with Laurent Polarizer. With circular scale reading 
 to 1° of arc and by means of verniers to ^°, equal respectively to 1% and i^% of glucose in urine 
 when the special tube of 189.4 mm is used. For use only with monochromatic light from a sodium 
 flame. With one patent tube of 189.4 mm and one tube of 94,7 mm and gas sodium lamp with 
 platinum ring, but without case. 
 Duty Free 56.55 Stock 75.40 
 
 Case, for above, of polished wood, with lock and key, taking polariscope tubes and vertical pillar 
 but not providing for the lamp or tripod base. 
 Duty Free 10.50 Stock 14.00 
 
 Explanation of the Use of Mitscherlich Polariscope in Urine Analysis. 
 
 For urine analysis tubes of special length, i.e., 189.4 and 94.7 mm, enable the user to deteiniint the 
 percentage by volume of glucose in the urine without special calculation. When the longer tube, i.e., 
 189.4 mm, is used the rotation obtained in degrees of arc is directly equal to the amount in grams of 
 glucose contained in 100 cc of the solution. When the tube of 94.7 mm is used for darkly colored speci- 
 mens, the result must, therefore, be multiplied by two. As the specific rotary power of albumen is the 
 same as that of glucose except that the latter is laevo rotatory while that of glucose is dextro rotatory, 
 this fact enables the investigator to determine the percentage of albumen when same is present. The 
 usual method of procedure is as follows: — 
 
If tho urine is not clear, i.e., il i 
 If it is so strongly colored that tin 
 shorter tube must be used. If tlii^. . 
 by being poured into a flask eonl.;i.iu. 
 acetate and then filtered. In this e 
 tcniper;iturc .shonld be within 15 arnJ 
 
 The tube is then filled and pl^L.'i 
 percentage of glucose. If tin' iivtur 
 gives a rotation in the opposih; ilite 
 equal to the number of dei:i\i.s i'<v 
 examinntifin the alhiiincn must Ijc 
 
 the solution 
 > lUO PC at 18° C. ' 
 '■ lii'tween this rcai 
 
 I '■ Ii'il II iiM,-' L. nil. 'ivd <|iiJrLK Ihroiitili ;L,suft filter paper. 
 
 !■. '■;i'i: IM' ■ ■,! I„. , I. ,|lv deli.ird l.lifnur.ll 1 Ih: long tubc, the 
 
 ■■'■■ :, .. ^1 , . Ill , . ,,,;i ; he ui iiii: iDU^l Iji; .-li|.;litly discolored 
 
 1^ |iuir di V :i!ii]Liai eaiboii or by ijeiag nii.xei.l wibh yu V3,rt of lead 
 ..se tlie reading of the rotation must be multiplied by 1.1. The 
 L'(l° C. 
 
 1 iTito the instrument and the reading in j^ degrees will give the 
 idiitains albumen, two readings will be necessary. As albumen 
 I iMii to glucose, the total reading in presence of albumen will be 
 i,hii'osf \rs^ than that for albumen. Before efTecting the second 
 
 ■ i-.li.-h :rr\ ■, f'-A . I ropS of 
 
 ■ filtrate 
 
 giu- 
 
 Lim. Equa,! i 
 l.-i. Equal in 
 
 Illuslrations.] 
 
 1. Almost colorless urijie witliout albiimt;! 
 field obtnined after a turn of 2° to the right, Vf 
 sugar = 2.9%. 
 
 2. Urine without albumeo, clear, but of 
 Percentage of sugar = 2X1-5 = 3.0%. 
 
 3. Brown urine, no albumen. 100 cc mixed with 10 
 Percentage of sugar 2.9 X 1.1 = 3.19%. 
 
 4. Brown urine, no albumen. Tube = 04.7 inm. 100 cc 
 Percentage of auear 1.3 X 1.1 = 2.88%. 
 
 5. Clear, almost colorless urine with albumen, tube 189.4 mm. a. Determinatii 
 sities after turning to left at .5°. b. .Reparation of the albumen; equal intensities 
 Percentage of sugar = 0; of albumen = .3%. 
 
 6. Clear urine with albumen, a. First rotation, equalintenaitiea at 2.7°. b. After removal of alb 
 tie." at 3.1°. Percentage of sugar = 3.1%; of albumen 3.1 -2.7 - 0.1%. 
 
 7. Sucrose solution. Observation tube = ISO. 4 mm; eijual intensitie.s :it j.2°. Percentage ••! sucro 
 
 Mlor. Observation tube 94.7 
 ! lead acetate. Tube = I 
 LLXed with 10 cc lead ao 
 
 intensities at 1.3' 
 
 ; equal intenai- 
 .2Xi=3,S%, 
 
 Polariscope, Schmidt & Haensch, with Jellet-Cornu Polarizer and Wedge Compensation, with Direct 
 Reading Linear Scale. For use with ordinary white light such as a petroleum lamp, incandescent 
 lamp, etc. When a 2U0 mm tube is used the glucose content present in the urine is read directly on 
 the scale to ■ris%- Where a highly colored specimen of urine is to be examined tubes of 100 mm or 
 50 mm are to be used, in which case the reading is to be multiplied by 2 and 4, respectively. 
 Complete with one each of patent tubes No. 44552 of 200, 100 and 50 mm length, Petroleum 
 Lamp No. 44516, on adjustable stand with asbestos cylinder as shown in illustration but with- 
 out case. 
 Duty Free 87.30 Duty Paid 116.40 
 
 Polariscope, Schmidt & Haensch, with Jellet Cornu Polarizer and Wedge Compensation, with Direct 
 Reading Linear Scale. Exactly same as No. 44320 but with analyzer and scale in new dust proof 
 mounting and with special Osram electric illuminating device, which serves at the same time 
 to illuminate the scale, with incandescent lamp used as resistance so that connection can be 
 made with ordinary lighting circuit. State voltage in ordering. A most convenient and satis- 
 factory outfit for hospital and other uses where many routine sugar determinations in urine 
 samples are to be made; without case. 
 Duty Free 119.10 Duty Paid 158.80 
 
ARTHUR H. THOMAS COMPANY 
 
 Pdlaribcopes frir Coneral Purposes, with Divided Circle. For use with MontKlirwrnatic Light. 
 
 (3=^ 
 
 No. 44332 No. 1 n:iB 
 
 Polariscope, Milscherlich, Schmidt & Haensch, exactly the same as No. 44312 but with bichromate 
 L'L'll inul iiibus of 100 and 200 mm in length instead of the special urine tubes. Reading to ■\-° 
 and useful for a variety of work in the investigations of wine, beer, oils, etc., where a great degree 
 of ii(.Tin:t{'y is not required. With gas sodium lamp with platinum ring. At extra cost a Ventzke 
 degree scale is furnished on these polariscopes. See No. 443;JG. 
 Duty Free 59.25 Stock 79.00 
 
 Polariscope, Milscherlich, with Laurent Polarizer, Schmidt & Haensch, with divided circle reading 
 in single degrees and by means of verniers to ^V"- With illuminating device for the divided 
 circle by means of mirrors, and with bichromate cell and one each patent tubes 100 and 200 mm 
 long, gas sodium lamp with platinum ring. In polished alderwood case with lock and key. 
 Duty Free 138.60 Stock 184.80 
 
 Polariscope, with Lippich Polarizer, Lippich, Schmidt & Haensch, with divided circle reading in 3° and 
 by means of verniers to i Ju-°, with simplified protection and mirror illuminating device for the 
 scale. On tripod support. With new arrangement for connecting the lamp stand to the base of 
 the polariscope so that it is always in exactly the right position. With bichromate cell, gas 
 sodium lamp, one each of 100, 200 and 220 tubes, in polished alderwood case. Recommended as 
 the most satisfactory outfit for general laboratory work. 
 Duty Free 187.50 Duty Paid 250.00 
 
 Polariscope, same a? above, i. e., including lamp, bichromate cell, :ilderwood case and new lamp arrange- 
 ment, bui. for 400 mm tubes, and with one each tubes 100, 200, 220 and 400 mm long. 
 Duty Free 200.70 Duty Paid 267.60 
 
 44344. Polariscope, exactly same as No. 44336, but tm trestle support, and without case. 
 
 Duty Free 211.50 Duty Paid 
 
 44348. Polariscope, exactly same as No. 44340, but on trestle support, and without case. 
 
 Duty Free 223.20 Duty Paid 
 
 282.00 
 297. GO 
 
R 
 
 H. 
 
 H 
 
 M 
 
 M 
 
 N 
 
 Optional Equipment for Polariscopes, Nos. 4433b, 44340, 44344 and 44348. 
 
 II .'Lis the safety and 
 Duty Paid, extra 40.00 
 
 Triple Field Polarizing Arrangement for greatly increasing the sensibilitj' as 
 convenience of the adjustment. 
 Duty Free, extra 30.00 
 
 Extra Ventzke Degree Scale in addition to that readitifr i 
 of a third vernier reads to -iV% of cane sugar. 
 Duty Free, extra 12.00 
 
 degrees of arc. The Ventzl 
 
 ale by means 
 
 443G0. Illuminating Device for the verniers consisting of a ininiai 
 iiig mirrors. 
 Duty Free, extra 9.00 
 
 443fi4. Accumulator, three cell, for use witli above. 
 
 Duty Free, extra 21.00 
 
 44.'S(iS. Glass Case. Folding, for use with instruments with trestle support. 
 
 For Polariscope with tubes, mm 
 
 Duty Free 
 
 Duty Paid 
 
 Duty Paid, extra 16.00 
 
 e G volt electric \iun\) in phice of the reflect- 
 
 Duty Paid, extra 12.00 
 
 Duty Paid, extra 28.00 
 
 15.00 15.90 
 
 20.00 21.20 
 
 Glass Case, with Base Board, for use on instruments with trestle support. See illustration page 431. 
 
 Kor Polariscope with tubes, mm 220 400 
 
 Duty Free 25.50~ "27.90 
 
 Duty Paid 34.00 37.20 
 
 Polariscope, Schmidt & Haenscli, with Lippich Polarizer, for both Macro and Micro Polarisation Experi- 
 ments. Consisting of Lippich Polariscope No. 44311, on trestle support with the addition of 
 three diaphragms of different sizes on the polarizer, a direct vision spectroscope adjustable for 
 all wave lengths and with Nernst lamp for illumination of spectroscope which also serves to 
 illuminate the mirrors of the scale of the polariscope. Operating on either direct or alternating 
 current. Voltage must be specified in ordering. Because of the great variety of work for which 
 this instrument is intended no equipment of tubes is included. Without Case. 
 
 For tubes, mm _ 22 400 600 
 
 Duty Free " 382.50 391.50 403.50 
 
 Duty Paid 510.00 522.00 538.00 
 
 Polariscope, Schmidt & Haensch, Landolt with Lippich Polarizer, with new arrangement for taking not 
 only all kinds of polariscope tubes but other heating vessels, cooling vessels, electrical devices, 
 etc. The polariscope proper is as described under No. 44344, with trestle support. With ad- 
 justment providing for the accurate centering of the optical system at all times. Without Lan- 
 dolt heating device G shown in cut. With special lamp after Landolt. For tubes up to 200 
 mm in length but without any tubes or case. 
 Duty Free 223.80 Duty Paid 298.40 
 
special V Shaped Trough to rest |->|>Qits cc for any kind of tubes. 
 
 Duty Free, extra .';.40 Duty Paid, extra 7.20 
 
 Heating Device. Landolt (G in illustration) consisting of an asbestos jacketed brass vessel with adjust- 
 
 aijle lid, thermometer reading to 100° C. and a polariscope tube, gold plated inside, 100 mm long 
 
 set ill .■"[ (ihis^ cylinder. 
 
 Duty Free, extra 19.50 Duty Paid, extra 26.00 
 
 44392 
 
 Electric Heating Device. Abderhalden, for constant temperatures, for 
 use on No. 44380, The usf of this device obviates the use of an 
 incubator in the Abderhalden technique. See Hoppe-Seyler's 
 Zeitschrift fiir Pkysiologische Chemie, Band 84, Heft .f. 
 
 Duty Free 90.00 Duty Paid 120.00 
 
 Special Tubes, Abderhalden's for use in above, 
 
 20 mm long and con- Duty Free DuUPald 
 
 taming 2 ec 3.00 4.00 
 
 44400. Special Thermometer, Ab- 
 derhalden's. for use in 
 above - 20°toS0°C. .. 2.2.^ 3.00 
 
 44404. Special Resistance, for 
 
 110 volts 12.00 16.00 
 
 44408. Special Resistance, for 
 
 220volts 15.00 20.00 
 
 Note.— The above deBCriheci Polariscope, No. 44380, with the special 
 Abderhalden Tubea No. 44.^96 and if desired, tlie special Heating 
 Device No. 44392, la used and recommended by Prof. Abdarhalden 
 in his work on the protective ferments of animal organisms and the 
 early diagnosia of pregnancy by the optical method. We are pre- 
 pared to furnish detailed estimates on (his equipment. 
 
 Abderhalden Electric Heating Device No. 4439: 
 
 Polariscope No- 443S0 and with Rheostat 
 
ARTHUR H. THOMAS COMPANY 
 
 Polariscope, Schmidt & Haensch, with Lippich Polarizer and Fischer Micro-Polarisation Attachment. 
 
 On trestle support with direct vision Spectroscope with Nenist lamp illumination. Voltage 
 must be stated in ordering. The spectroscope is permanently adjusted for the D line. With 
 triple (ield polarizer arranged for the observations of very small fields. Will take ordinary 
 tubes up to 220 mm in length. With one micro tube after Fischer .50 mm long .1 cc content, and 
 one 100 mm long, .2 cc content, but without other tubes or accessories. 
 Duty Free 367.20 Duty Paid 4R9.60 
 
 Polariscope, Landolt, Schmidt & Haensch, siiiiihu- to ,\n. 4 J8S0 but with the 
 
 addition of a Direct Vi.sion Spectroscope, but without tubes, case, ""')' free Uuiy Paid 
 
 or source of light for the spectroscope 385.50 514,00 
 
 Nernst Lamp Illuminating Apparatus for the above Spectroscope, as 
 
 shown in illustration of No. 44376. Extra 27.00 36.00 
 
 Direct Vision Spectroscope, only, as in above outfit, specially arranged for 
 
 use with the Polariscope, mounted on special base 150.00 200.00 
 
ARTHUR H. THOMAS COMPANY 
 
 1' r 
 
 ^i.^ 
 
 Polariscopes for Sugar Analysis (Saccharimeters) 
 
 As these instntments are all supplied with either single or double wedge compensation they may be 
 used with white light nf nny sourf-e but the plectrir illuminating device No. 44476 is spprially recom- 
 
 istration 
 ■■nts may 
 I .y which 
 < are sup- 
 
 mended. All of t 
 
 N0.4442S. The... v. ,. .1, .j 1 in \"rntzkr .l.-ivi-^ lur -^n- ■ ■■ ' -■.■ I- ■ 'in 
 
 be used for other I'.i I . ■ ' ■ . . -uii; i lu> farL^r 1 M'nii /.kc = il :i !'.": ■ .■■ ■ ..1. 
 
 factor Ventzke di'-i. .- ■!■■ - nlrd into decrees of -avc. A? rr-ui'nl; h-Ird iln' 1 [■ ^1 miii^.--],! 
 
 ))lied with the donldo I.iihhlIi i'ularizer with the triple field Polarizer as optional equipment. 
 
 Polariscope (Saccharimeter) Schmidt & Haensch, with Single Wedge Compensation, with linear scale 
 divided on Xiekolin, reading directly from -25 to +100° Ventzke. With new dust proof mounting 
 for scale and analyzer, double Lippich Polarizer and bichrgmate cell. For tubes up to 200 mm 
 in length and including one each of patent tubes No. 44552 of 100 and 200 mm length but with- 
 out lamp. On tripod support as shown in illustration. In polished alderwood case. 
 Duty Free... 142.20 Stock 189.60 
 
 Polariscope, same as above, but for 400 mm tubes, and including one each of No. 44552 patent tubes 
 IDO, 200 and 400 mm length, in polished alderwood case. 
 Duty Free 152.10 Duty Paid 202.80 
 
 Polariscope, exactly same &s 
 Xo. 4442S, i.e., with 100 
 mm and 200 mm tubes, 
 but on trestle support and 
 without case. 
 
 Duty Free 147.00 
 
 Stock 196.00 
 
 Polariscope, exactly same as 
 No. 44432, i.e., with 100 
 mm, 200 mm and 400 mm 
 tubes, but on trestle sup- 
 port and without case. 
 
 Duty Free 156.00 
 
 Duty Paid 208.00 
 
44444. Polariscope (Saccharimeter), Schmidt & Haensch, with Double Wedge Compensation, and linear scale 
 
 re;uling from -100 to + 100° Ventzke. Otherwise same as No. 44428. With one each 100 mm and 
 
 200 mm tube?, on (ripoil support, in polished nldervvood case. 
 
 Duty Free . J!t7.70 Stock 263.60 
 
 44448. Polariscope, Siinie a^ No. 44444 bvil, fm- 4iH) nirn lulics, including one each 100 mm, 200 mm and 400 mm 
 
 tubes, on tripo.l siippurl, in polisljrd :ddoi\\nnd case. 
 
 Duty Free 210.60 Duty Paid 280.80 
 
 44452. Polariscope, s;irnr ;iw X<j. 44444 Init on trestle su])]miiI. Ini'ludins; onr eacli 10(J nmi and 200 mm tubes 
 
 but witlinut casi'. 
 
 Duty Free 202.50 Stock 270.00 
 
 44456. Polariscope, same as No 4444n. i.e., fur 400 mm tubes, Init, on trestle support, including one eai^-h of 
 
 100, 200 and 400 mm tubrs, hul without case. 
 
 Duty Free 217.50 Duty Paid 290.00 
 
 I44BC. Polariscope i Sacth trimeter Biles with Double 
 A\edgi. Compt nsalion wilii \arnble sensi- 
 lu]it\ nill>ivl]tn< silnisIT S Patent, 
 ltl> IJlh liir I II I I 1urnm„ amiUed 
 head both m I i i ii i7Pr Nicoli are 
 
 lotated Rimull i ii^^h theoorrect 
 
 angle to gi I n iliilit\ ind 
 
 bnahlTii \ il li I 1 I 1 1 I ) point 
 
 oi otli 1 II 1 1 II II I II I 1 w angle 
 IS sho\\ (1 1 \ iIk 1 scale 
 
 whiili 1 111 1 1 iiM \i I III This 
 
 iiran^imtnt jjiimits of n ulmo under 
 theuKtu 
 and ■\ rin 
 and I 
 
 \ peifect (unditnms T. he sea! 
 HI ilili ] upnn^iound glass 
 Hi III ] !i_ht The ob- 
 jectK II II ill n -vernier and 
 
 lumonU used is 
 Il I -vji m'^ion co- 
 in c isiU be inter- 
 Si iIps ie\d up to 
 It' 
 
 > 01 
 
 44464. 
 
 bcali 
 
 thu 
 
 effio( 
 
 polati 
 
 a 100 
 
 aniK I 1 I 
 
 leadiii III' I 
 
 erati i i i 
 
 can I I I III I 
 
 ( umpkli on -it md 
 
 ind 200 mm tubes 
 
 hi top of the 
 
 II 111 d thtimometer 
 
 ' ^ III II b\ the temp- 
 
 I 1 I he in=^trument 
 
 r I ^(10 mm tubes. 
 
 with ono each of 100 
 
 ase 850 00 
 
 Polariscope Tube 
 
 niuin deep 
 
 Length, 
 Each . 
 
 , Bates, nl 
 
 polarizatii 
 I parts of I 
 
 Polariscope, Bates, exactly same as above, but for 
 400 mm tubes. Complete on stand, with 
 one each of 100, 200 and 400 mm tubes, in 
 
 case 900.00 
 
 h a mm bar to eliminate danger from bending and to give mini- 
 dl reflection. The weight is carried upon two shoulders which 
 Kid not upon the ca])s. 
 100 200 
 
 4.00 
 
 4.00 
 
ARTHUR H. THOMAS COMPANY 
 
 Note.— Fig. 13 illustrates the new arraogement for adjusting quartz wedges wherebv one milled head is alnj\3 protected when the 
 other la exposed The position of the milled heads in Fig. 13 la that of the instrument with tripui support. i\hile on the 
 inotnimonia >vit.h trestle support the milled heads opcupy the poaitinn shown in No 4^H^2 
 
 Optional Equipment for Sugar Polariscopes. (Saccharimeters.) 
 
 44472. Triple Field Polarizing Arrangement, for greatly increasing the sensibility as well as the safety and 
 convfnience of the adjustment. Cannot be attached to an instrnment after delivery. 
 Duty Free, extra 30.00 Duty Paid, extra 40.00 
 
 4447(>. Electric Illuminating Device, with special Osram lamp. With mirror arrangement for the illumi- 
 nal ion of the scale, lamp for resistance provided with shade to illuminate note hook; adaptable to 
 ordin:ir\' linliling <-Jn'iiil . Sl.ifo \oltage in ordering. Shown attached in No. 44452. 
 Duly Free, extra 40.50 Duty Paid, extra 54.00 
 
 44480. Special Tropical Finish, nToiriiiinidr!! where instruments are to be used in moist and tropical climates, 
 iiisin'ing protection to botii metal and optical parts. 
 Duty Free, extra 4.50 Duty Paid, extra 6.00 
 
 444K8. Thermometer, in analyzer with projecting stem for convenient reading as m Fig. 13. 
 
 Duty Free 4.50 Duty Paid 6.00 
 
 44492. Case, iif polished alderwood, with glass sides and base board, for covering the Polariscope in its work- 
 ing position, with room for lamp. To cover polariscope taking tubes 200 mm 400 mm 
 
 Dutv Free 25.50 27.90 
 
 Duty Paid 34.00 37.20 
 
 444^6. Case, Folding, of polished alderwood, with glass sides, for conveniently covering Polariscopes with 
 
 trestle support in the laboratory. To cover polariscope taking tubes ■__ -00 mm 400 mm 
 
 Duty Free .~" 1.5.00 15.90^ 
 
 Duty Paid 20.00 21.20 
 
Polariscope (Saccharimeterj ("or Beet Sugar Investigalioiis. Schmidt & Haensch. with restricted scale 
 reading from to 35^ Ventzke, single wedge compensation, for use with white light. With direct 
 reading linear scale engraved on Nicbelin, with new dust protecting device for analyzer and com- 
 pensation, and with bichromate cell. On tripod support with two 200 mm tubes, in polished alder- 
 wood case, but without lamp. 
 Duty Free 100.20 Duty Paid 133.60 
 
 Polariscope, exactly same as No. 44500 but on trestle support and without case. 
 
 Duty Free ICi.OO Duty Paid 140.00 
 
 Polariscope, exactly same as No. 44504, but with both circular and linear scales. 
 
 Duty Free 171.00 Duty Paid 228.00 
 
 Polariscope (Saccharimeter) for Beet Sugar Investigations, Schmidt & Haensch, similar to No. 44500 
 but with special scale reading from 80 to 100% so that with the use of 400 mm tubes the reading 
 is direct. For 400 mm tubes only. With two 400 mm tubes, but without case or lamp. 
 Duty Free 110.10 Duty Paid 146.80 
 
 Note.— With thfl inatrumenta for beet augai inve.stigatioos. i.e.. No. 44.ino, 4t.i04, 44.'i()S and 44.')l:i it is recommended that the 
 normal quartz plate No. 44612, for tlio eoiitrol of zero, be purchased. 
 
 i 
 
 J^S^' 
 
 
 No 44 - No. 4452J 
 
 44516 Polariscope Lamp Schmidt &. Hiensth kerosene i l]u t ble stan 1 with asbestos chimney. 
 
 Duty Free 7.20 Stock 9.60 
 
 44520. Polariscope Lamp, Schmidt & Haensch, Gas, on adjustable support. 
 
 Duty Free 7.20 Stock 9.60 
 
 44524. Polariscope Lamp, Schmidt & Haensch, Electric, on adjustable stand. State voltage In ordering. 
 
 Duty Free 10.80 Stock 14.40 
 
 Note.— The above three lamps are recommended for aae with all wedge compengation instruments when the special electric Osram 
 13 not uaed. 
 
44328. 
 
 44532. 
 44.136. 
 
 Polariscope Lamp. Schmidt & Haensch, on adjustable stand, with sodium ring to give monochromatic 
 sodium flame. .\s illustrated in No. 44328 and 44336. With Bunsen burner for gag. 
 Duly Free 10.20 Stock 13.60 
 
 Polariscope Lamp. Schmidt & Haensch. Alcohol, wil 
 Duty Free 12.60 
 
 I jilatinum ring for sodium flame. 
 Stock 
 
 16.80 
 
 Polariscope Lamp. Schmidt & Haensch, Landolt. Gas. with special Bunsen burner, on arljustable 
 stand, with rectangular ehiumey and two niclcel holders for the sodium chloride, as illustrated 
 in Xo. 44380. 
 Duty Free 13.80 Duty Paid 
 
 Polariscope Tubes, Schmidt & Haensch, Glass, with either screw cap or slip cap. 
 
 Length, mm 50 04.7 100 189.4 
 
 Duty, Free 2. 40 2.40 2.40 2.40 
 
 Stock 4.00 4.00 4.00 4.00 
 
 200 
 2.40 
 4.00 
 
 Extra Glass Tubes only for above 
 
 l''or tubes, mm 
 
 Duty Free 
 
 Stock 
 
 .7.5 
 
 .75 
 
 .75 
 
 200 
 .45 
 .75 
 
 2.40 
 4.00 
 
 220 
 .45 
 .75 
 
 ■ slip cap. 
 220 
 2770" 
 3.60 
 
 18.40 
 
 400 
 2.70 
 4.50 
 
 400 
 .50 
 .90 
 
 440 
 3.00 
 4.00 
 
 Polariscope Tul>es, Schmidt & Haensch. Brass, nickel plated, for either screw cap f 
 Length, ]]im .30 04.7 100 ISO. 4 200 
 
 Duty Free 2.70 2.70 2^70 2.70 2.70"" 
 
 Duty Paid 3.60 3.60 3.60 3.60 3.60 
 
 Polariscope Tubes, Schmidt & Haensch. Patent Glass, with enlarged end to take air bubble, with 
 either screw cap or slip cap. 
 
 Length, mm 50 04. 7_ 100 189.4 200^ 220_ 400 
 
 Duty Free 2.70 2.70 2.70 2.70 2.70 " 2.70" "3.00 
 
 Stock 4.50 4.50 4.50 4.50 4.50 4..50 5.00 
 
 Extra Patent Glass Tube; 
 
 For tubes, mm 
 
 Duty Free 
 
 Stock 
 
 only for above, 
 50 
 
 1.00 
 
 94.7 
 .60 
 1. 00 
 
 100 
 .60 
 1.00 
 
 189.4_ 
 .60 
 
 _ 200_ 
 .60 
 1.00 
 
 _220 
 .60 
 1.00 
 
 400 
 .75 
 1.25 
 
 Polariscope Tubes, Schmidt & Haensch, Inversion fi 
 
 cap or slip cap. 
 
 Length, mm .")0 94.7 
 
 Duty Free 3.00 3.00 
 
 Stock 5.00 5.00 
 
 Fxtra Glass Tubes only for above. 
 
 For tubes, umi .50 94.7 
 
 Duty Free 90 " 00 
 
 Stock 1.30 
 
 Polariscope Tube. Mic 
 
 Length, mm 
 
 Contents, cc. . . . 
 
 Duty Free 
 
 Duty Paid 
 
 filling and for thermometer, with cilher screw 
 
 _J0O 
 3.00 
 
 189.4 
 3.00 
 5.00 
 
 1..50 
 ) Tube. Fischer, Schmidt & 
 
 1.50 
 Haensch. 
 
 200 _ 
 3.00 
 3.00 
 
 200_ 
 
 90 
 
 1..50 
 
 220 
 3.00 
 5.00 
 
 220 
 
 ' 90 
 
 1..50 
 
 100 
 3.45 
 
 400 
 1.05 
 
 100 
 0.2 
 
 3.60 
 4.80 
 
 3.60 
 4.80 
 
 Polariscope Tube, Abderhalden, Schmidt & Haensch, 200 nun long, containing 2 cc, with water jacket. 
 Duly Free 7.20 Duty Paid 9.60 
 
f ^ 
 
 Haensch. fur ji;(iULT;il suiuuliliu wurk, of glass, 
 ion, etc., including thermometer graduated from 
 
 _100 
 2.00 
 
 200 
 12.60 
 
 Polariscope Tube. Inversion, Landolt, Schmidt & 
 
 with brass water jacket, theriiiometer tubul; 
 
 10 to 32° C. in Joths. 
 
 Length, mm 50 
 
 Duty Free 12^0 
 
 Duty Paid 16.00 16.00 16.80 
 
 Polariscope Tube, Inversion, Schmidt & Haensch, with brass water jiicke 
 
 eti.-., hut without thermometer. 
 
 Length, mm 100 
 
 Duty Free 6.00 
 
 Duty Paid 8.00 
 
 Polariscope Tube, Pellet, Schmidt & Haensch, arranged for continuous flow of liquid to be observed 
 
 Length, nmi 100 200 400 600 
 
 6.90 
 
 _220 
 12.90 
 
 200 
 
 400 
 13.50 
 18.00 
 
 or then 
 
 40^_ 
 '7.20 
 9. GO 
 
 600 
 14.40 
 19.20 
 
 ometer, 
 
 6 00 
 8.10 
 10.80 
 
 .5.70 
 7.60 
 
 6.00 
 
 8.00 
 
 400 
 9.30 
 12.40 
 
 Liiported in 
 
 9.20 
 
 600 
 
 10.20 
 13.60 
 
 Duty Free 5.70 
 
 Duty Paid 7.60 
 
 Polariscope Tube, same as above but witli funnel and gauge tube. 
 
 Length, mm 100 2 
 
 Dutv Free 9.00 9. 
 
 Duty Paid 12.00 12. 
 
 n Polariscope Tubes eaa only be extended when the tabes 
 
 44.>S8. Polariscope Control Tube, Schmidt & Haensch, of brass. Complete in case. 
 
 Duty Free 36.00 Duty Paid 48.00 
 
 44592. Cover Glasses, 15.5 mm of optically inactive glass, diameter, for the regular polariscope tubes, per 
 
 dozen 1.50 
 
 44596. Cover Glasses, 23.7 mm dianMtfr, I'm- llir i>;itPTiT. tubes and the Inversion tubes, per dozen 2.25 
 
 44600. Cover Glasses, 26.2 mm diiuintfr, Inr i Iji' Abilfjhalden tubes, per dozen 2.00 
 
 44604. Rubber Rings, for use between above cover ghi.sses. 
 
 For cover glasses, mm in diameter .,..,, 15.5 23.7 26.2 
 
 Per dozen 25 .30 TSS 
 
 44(108. Polariscope Test Plate of quartz, optically pure, for testing the scale anywhere between 25° and 100° 
 
 Ventzke either right or left. 
 
 Duty Free 10.50 Stock 14.00 
 
 44612. Polariscope Test Plate of quartz, optically pure, for testing the scale from —25 to +25° \'entzke. 
 
 Designed csjieciiillv for use with Polariscope, No, 44512. 
 
 Duty Free 15.00 Duty Paid 20.00 
 
 44616. Polariscope Test Plates, .-ict of 5 in accordance with the "Internationalcn Konnnission ftir einheitliche 
 
 TTntcrsuclinngsiiictJiodcn." In case. 
 
 Duty Free 60.00 Duty Paid 80.00 
 
 ., No, 44G16, is furnished with certificate of the Physikalisch-Techniache Reichsaiistalt at extra 
 
44700. 
 44704. 
 44708. 
 44712. 
 
 44716. 
 44720. 
 44724. 
 44728. 
 44732. 
 447.56. 
 44740. 
 26664. 
 U7U. 
 44748. 
 
 , Liebic, wifh liv.' \ntlhs.. 
 
 Liebig-Dillmar 
 
 Liebis-Kjil 
 
 Winkler. Jlfisilit, mm . 
 
 Each,. 
 Potash Bulb, 
 
 Winkler-KyJI . 
 Mohr 
 
 Potash Bulb. Norri.s . 
 
 ■i tube 
 
 " with rubber connections . 
 " ground in 
 
 .75 
 .75 
 180 
 1.25 
 1.30 
 .80 
 1.00 
 1.20 
 1.25 
 
 50 
 
 Gei-ssler-Wetzel, with ;i ball fio.it valve in each of the lower bulbs 1.75 
 
 and Dryin;^ Tube Combined, Vatiier. (See Vanier Combustion Train p. 150) 3.25 
 
 Gomberg, with ground in side tube 1.50 
 
 Potash Bulb, Bowen, for very thorough absorption. Size Small Large 
 
 Each 1^55 2700 
 
 Potash Bulb Support, of ivood, adjustable as to height 1.50 
 
 We devote over eight thousand sq. ft of floor space to our 
 salesroom and offices, maintaining a permanent exhibit of 
 Laboratory Apparatus amounting to over six thousand different 
 pieces, conveniently arranged for the inspection and handling 
 by our visitors, and a dark room for the demonstration of Pro- 
 jection and Micro-Photographic Apparatus. 
 
 We recommend that customers visit our establishment 
 when possible before the preparation of equipment lists and 
 use this facility we provide for the careful selection of ap- 
 paratus. 
 
ARTHUR H. THO MAS COMPANY 
 
 Press, Hydraulic, Eiichner fur :n)l 
 
 mm in diiuiieter by oUO mn 
 by 5U0 mm with a capacity 
 
 Duty Free 
 
 Press, Hydraulic, of the same gen 
 
 iiospheres pressure, with two cylinders of pci-furatci,l tin, one lis 
 ^h, wilh a capacity of about 5 liters, and the laryrer one 200 mnj 
 iliMiit 1.-. lilers. 
 
 . 205.nn Duty Paid 245.00 
 
 oniitruction as the large press after Eiichner but of smaller 
 
 dimensions and for very high pressures, i. e., 600 atmospheres. 
 
 Duty Free 128.75 Duty Paid 155.00 
 
 Cylinder, Abderhalden, for use with the above presses, cpnsisting of a perforated metallic cylinder 
 
 55 mm in diameter, with removable bottom and piston, with collecting tray and spout 
 
 Duty Free 14.85 Duty Paid 17.85 
 
 Cylinder, Meyer, for use with the above presses, consisting of ten heavy, accurately fitting, metallic 
 
 rings, 70 mm in diameter. See Arch'v f. exp. Path, h, Phannahilogie, Bd. 47, pay. 426'. 
 
 Duty Free .^3.00 Duty Paid 40.00 
 
Press, Tintture, i.'.\Lrii licavv, for iiKLkin;; tiiirturos, dcfOL'tiotis, iiifii.sioiis, ere. 
 
 Capacity, quarts '. 1 _' 4 8 
 
 Each 3.75 4.50 6.50 10.00 
 
 Press, Laboratory, for use where material must not be in fontiiet with metal, oximsi^il p;irts being made 
 of poreehiiii; iliamt'ter of press plate, SO mm 17.00 
 
 Press, Laboratory, Witt, with porcelain plates, the lower one with trough ;inil wit.li prossini;; surface 
 150 uirn si^[uare. \ ery heavily built to withstand strong pressure. 
 Duty Free 33.00 Duty Paid 40.00 
 
 Press, Sodium, Kossel, for the direct preparation of ^ Normal solutions wilhout weighing of the 
 .sodium. See Hoppe-Seyler, Zeitschr. f. pkijsiologische Chemie, Bd. 33. 
 Duty Free 21.00 Duty Paid 25.20 
 
 Press, Sodium, Hofmann, with separate removable cylinder for jiroducing both wire and ribbon. 
 ^\■ith iiioldrt for wire of I, g, 1 and 2 mm diameter and ribbon of 0,4 by 10 mm 17.50 
 
 Press, Laboratory, for sugar beet samples, cylinder GO nun diaTiicter with fine perfor:itinns through which 
 the juiif is pressed into the dish shown below. 
 Duly Free 40.50 Duty Paid 54.00 
 
ARTHUR H. THOMAS COMPANY 
 
 PROJECTION APPARATUS 
 
 No. 4 ■1820— Enlarging Oulfit 
 
 PROJECTION APPARATUS, BAUSCH & LOME MODEL B BALOPTICON. This liltln U;il,ppti(oii is a high 
 gr'idc storcopticoii fur use in snnll clis^rooms etc 
 
 We furiiibh the "VIj lei B with e thei ^mM aiclirap and compact rheostat rrwith the new 250 
 ^^ itt nitiogen filled Miz li I mpi\itl bd\ ul f^bl e in 1 concentrated fiUment Thi-^ new lUuiii- 
 
 nant ^i\e\ ^ln t 
 circ lit ^n 1 I t i II 
 
 Lho 1 ai n I i 
 
 ifLitn I 
 
 lai ip s") t 
 i ct In Wei 
 
 Kn ] 11 it 111 
 U t 11 11 
 n ittii L, n to I '.c 1 
 cU 
 Lamp House— Of si eet etal -n t 
 a et lene or Wei b'lcii 1 
 chiDge lb I ft ng out 
 illuminanl—Bd cl t Lo Y \ 
 
 I 
 
 I 
 
 \ 
 
 I 11 1 I h t iirpnt 
 
 1 I dfjr 
 
 lation 
 
 I to the 
 
 I 1 tleian 
 
 II ai t tie le-iiie 1 wc can upi Iv tl e extra 
 
 sj e 
 
 It I tl 
 1 i. \s\ 
 
 1 \ei til t 1 1 both lamp house ^nd condenser mount per- 
 f lesire 1 \ ith it the expense an 1 inconvenience of a water 
 
 pfor 
 
 
 44800. Model B Baloptuon 
 
 ii tl I 
 44804. Model B BaloptKon 
 
 4481: 
 
 4481.^. 
 
 44820. 
 
 Acetilene Tank Prest o lile . i 
 Lantern Slide and Enlargin^j Oi 
 
 ith If) ni. It. rf Acet-vlcne .... 
 use in connection with Model H H iliipti( 
 
 1 [ 1 1^ in ibc with 
 22 00 
 24 00 
 20 00 
 20 00 
 
 10 00 
 
 (insisting of the 
 
 Kn ^e 1 to tiHe or hiseboard 
 
 , frticalK or honaontalU and mounted at one end of track. 
 
 it r I u rti - tl ISilopticon at suitable height to : 
 
 ■ p house of Balo|.ti 
 
 «ki - 
 
 projection lens ti hr n j HrLr „ sei =iti/eJ paper en ea^el 
 (_onipl.li oiilhi 18.00 
 
 Flange, f(jr iis< wh u it is Ksiieii to use photogi iphn lens fiom the cimen, same to be attached to 
 the hont boaid ot the Biloptuon Make and sizt uf the photogiaphic lens must be specified in 
 ordering - _. 2.00 
 
 Note — For small enlargements the regular 10-inch e. f. projection objective supplied with the Model B 
 is satisfactory. For larger work a shorter focus lens is recommended such as the 6-ineh regular 
 projection objective. 
 
give J, il u n ti n jual to tl l j-i Ijn p ^ ith mj,ll i 1 r»i ; 
 circuit an I neirlj is brilliant s sime on diiect cnirent cucuit 
 arc lamp with the laigpi cirbon=! \ tl i f irrcnt of t i to t nnt- 
 Lamp House— Ti\o st le I ^d i 1 
 
 taniir 1 Balopticon 
 
 V tre to be handled, 
 
 le 1 for u e with the 
 
 tl n of arc lamps. It 
 
 n -ii 11 pcrts ilternitmg current 
 
 It does not equal m illumination the 
 
 fi T pnr s 
 
 tor and provided 
 
 I largp style meaa- 
 
 en and provided 
 
 I 1 I pred globe. 
 9t o n etal neatl Hcque d black meaa- 
 
 PoGSible A 
 
 snple 
 
 't cal attachn e 
 
 n] heradjusU 
 
 Spe 1 1 1 on w ith large 1 t,l t t ^ht lamp hou e 'We strongly 
 
 rei.'i I t t 1 t II revents am ligl t from oscapmg into the ro m and is 
 
 crm, i I tl n \. water cell to mm miz the heat passing through the 
 
 slii] lilt i\ M d 1 ( t n lit nal c st as in heated in the foot note below 
 
 44828. Model «.' Balopticon, as above described, with small lamp house and 6-inch focus, If inch diameter 
 
 prnjecfiun Ions 30.00 
 
 44832. Model (' Balopticon, as above, and 8-ineh focus. If inch diameter projection lens 30.00 
 
 44836. Model C Balopticon, as above, with 10-inch focus, If inch diameter projection lens 30.00 
 
 44S40. " ■' " " " " 10-inch " 2-^ inch " " " 35.00 
 
 44844. " " " " " " li2-inch " 2^ inch " " " 35.00 
 
 44848. " ■■ " " " " 15-inrh " 2,',; inch " " " 35.00 
 
 448.50. " " " " " " 10-inr|. " ■:/. inrh " " " but with new 250 
 
 watt nitrogen filled Mazda lamp w il li i''. ■ i ■ i .■ 'lif instead of regular hand filled arc lamp, 35.00 
 Note — Any of the above outfits may be su|i|. ■■ ■! ■■ n ii ' 1 1 ;;r lamp house at an extra cost of $7.50. These 
 outfits are not regularly supplied wii ii i i; i \\ii:a i;i^c but one of lacquered metal can be supplied 
 at $2.50 additional. 
 Note — If any of the above Balopticons is desired with some lamp other than the hand feed arc, deduct 
 the price of the latter .110 00 and add price of illuminant desired (see "Balopticon Accessories"). 
 Note— \ In"- II n I p fi tp 1 to tl e Model C at an extra cost of S5.00. 
 
 PROJECTION APPARATUS BAUSt H & LOMB MODEL D BALOPTICON, with heavy lathe bed optical bench 
 ofg t 1 1 1 bl I tr I riy designed for laboratory work. This outfit, par- 
 
 ticul 1 wl en purch ?e 1 w tl t lamp house may be used as a basis for the building 
 
 up of the most elaborate outfits as this form of optical bench takes all of the acces- 
 
 sories I rov ded for the Un ers 1 itfits used in science teaching. 
 
 Base — Con back, aupportiag optical bed 2J in. in height; front support pro- 
 
 d 
 
 Optica Bed pporta tor different parts which may be adjusted aa desired and 
 
 HK dates proiection lenses of loagest focus. 
 
 Lamp Hou fitted with B & L special patented light-tight ventilator and pro- 
 
 g, 14 in, high and 71 ia. wide, liglit-tight, constructed of double 
 
 d d w h a ge ght-tieht door on the side— ^wnforma to the moat rigorous require- 
 
 lElum n n 
 
 Cond ns n d h g cell; diameter, 4J in. 
 
 Proje on I 
 
 Dimens on 
 
 Case — Reg E b d, measuriag 29 x 13i 
 
 x8 
 Possible A m n ed rge microscope, ver- 
 
 a d hdhaabnbe used successfully 
 
 w h h a B or con 
 For scientific worlv wp recommend the use of the Irtrgc light tight lamp house as listed. Its use pre- 
 
 veijfW till' c^r, ■:[,(■ 1,1' ;i I IV li^lil iiil.i I lir Hj.iih, ;i|y i (i i [ )n!'I /i II I fi'ill iin' ill .-ril'Otific pTOJCCtlOn, aud bcCaUSC 
 
 of it.K criii-'i I II 1 1. ■ I i 'I !■ i , ■■ . I' I . .1 ■ I . . ' I I .1 ; Mill t, long demonstrations. The 
 
 44852. Model U lialuplia.ii. :i.-,i),in,<' iIl..uiiI.uiI, v. r.li I.h-.j li-ll l,l;IiI L.Lii. huuse and 10-inch focus, If inch 
 
 diameter projecUun leiifa 72.50 
 
 44856. Model D Balopticon, as above, with 10 inch focus, 2i^ inch diameter projection lens 77.50 
 
 44860. " " " " " 12-inch " 2,^ inch " " " 77.50 
 
 44864. " " " " " l.-j-inch " 2,\- inch " " " 77.50 
 
 Note — Tlicsc niitlifs arc not rcgul.'irlv siip|>lLed \\itli imsc-^ but :i special wooden case can be supplied 
 al. W.OII pvtra. 
 
 440 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 4487H— Porlable Model (' wilh Ttipod, Case and Acetyleni 
 
 PROJECTION APPARATUS, BAUSCH & LOME DOUBLE MODEL C FOR DISSOLVING EFFECT, with 
 Bausch & LuMib patent iris diaphragm dissolver, whicii affords a perfect blending of one picture into the 
 other. With the exception of the iris dissolver the outfits are standard Model C but when ordered to- 
 gether are furnished with the necessary connecting pieces to ligidly join them together. 
 44868. Double Model C Balopticon, with 6, 8 or lO-inch focus, 1^ int'h diameter projection lens, as specified, 
 
 with iriy dissolver 75.00 
 
 44872. Double Model C Balopticon, with 10, 12 or 15-inch focus, 2^ inch diameter projection lens, as specified, 
 with iris di.?solver 85.00 
 
 PROJCCTIf N \PPARATUS BAIS H& LOME PORTABLE MODEL C as widely used by members of the staff 
 
 E nhehd-v\okFm Institute work, etc., and as supplied 
 
 h en p e he Ro L fe! c '^ n tary Commission for the Eradication 
 
 Supp ng T 
 Carry ng C 
 
 er. 10-inch focua Standard projection lens ; 
 reflector. 
 
 is detachable, asbestos lined and fitted with 
 
 g h ndle attached to heavy leather strap and. in 
 
 pacity and a second illuminant, both of which 
 
 particularly the arc lamp, is preferaljle, and it 
 
 be found listed elsewhere. For those desiring 
 
 p j,iii roller. It is furnished in a canvas covered 
 
 jr carrying with the outfit, the whole weighing 
 
 44876. Portable Model C Balopticon, as above described 45.00 
 
 44880. " Screen, 6 ft. square, on phiin roller in canvas covered case with reinforced leather ends. 8.00 
 44884. Acetylene Gas Tank, 10 cu. ft. capacitv 10.00 
 
ARTHUR H. THOMAS COMPANY 
 
 PROJECTION APPARATUS, BAUSCH & LOMB COMBINED BALOPTICON, NEW MODEL, providing for 
 I:iiitern slide projection ami projection of opaque objects with immediate interchange from one to the 
 other. The new model differs from the earlier model of the Combined Balopticon in that it is now 
 provided with a horizontal object holder for opaque objects which has been found in the Universal 
 and Convertible models to be distinctly better than the vertical object holder and, further, that opaque 
 projection is accomplished with the object on the screen in the correct position from left to right, i.e. 
 without reversion of the image. This is accomplished bj^ illuminating the opaque object directly 
 from the arc by placing the lamp house in the inclined position so that the image projected vertically 
 through the opaque projection objective is reflected horizontally to the screen by the mirror over the 
 opaque object. Lantern slides arc projected with the lamp house in the horizontal position and the 
 change from the projection of liinlnn slides In npaque piojection, or vice versa, is accomplished by the 
 simple shifting of the lani]) Ikhi.-c fmni ilie horizoulul to the vertical position as shown in the illustra- 
 tion. The size of the area which may be projected through the opaque projection objective is 5 x 5 
 inches and the object holder is so constructed that large illustrations can be shifted about to cover 
 in\ desired area foi projection For convenience m handling photogiaphn, pliti. and post cards two 
 earners are ^upplled with adjustable fiames to tike cjids of \ iijmg width 
 
 Lamp HousL 
 
 IS lark chami tr at height of ilj inches. 
 
 1 r \v \ Qtilatel onstructed of double 
 
 ] LC al patented entilator; with large 
 
 i I tt \ei_n horizontal supports at front 
 
 of opaiue ohjccts and held rieidiv 
 
 I Liidi— -'-- 
 
 with opening n bottcti for piojLctecl objects 5 inches 
 
 
 iKht 1 ie 
 
 
 controlli 1 I > 
 
 two stronc spring 
 
 
 base a,nd i 
 
 omiti all\ 1 iinging o 
 
 ject 
 
 blide Camtr 
 
 Post Card ( ar 1 n bicks in I frame which fit opique objLCt holder 
 
 Projection L lird lenses with rick and pinion focusiiiE idjustment of such relative foci 
 
 a 7e from opacjue objects and lantern slides lens for opaque objects fitted 
 
 Dimensions I i jt projpctio i I ns for Uitern •iliie'5 height to top of mirror 33 inches. 
 
 New Combined Balopticon, aa abo\e, with 4 inch diametei, lo inch focus lens for opaque projection 
 and 1^ inch diameter, 10 inch focus lens for lantern slide projection; without rheostat. . . 120.00 
 
 New Combined Balopticon, as :ibove, but witli 18 iiii'li focus lens for opaque ].irojcfl ion and 12 inch 
 focus li'iis for laiiLcrn .slide projection. 120.00 
 
ARTHUR H. THOMAS COMPANY 
 
 No. J4WHK in Posilian for Opaque Projection Na. 44392 With Projection Microscope 
 
 PROJECTION APPARATUS, BAUSCH & LOMB UNIVERSAL BALOPTICON. New Mode!, providing for Ian- 
 tern slide projection, opaque object projection by reflected light from an area fix6 inches, micro 
 projection, and projection of objects in a horizontal position by transmitted light with the use of verti- 
 cal attachment. 
 
 The interchange from lantern slide projection to projection of opaque objects is instantaneous without 
 taking down or building up any part of the apparatus. With the vertical attachment in position 
 the change is made instantly from opaque projection to either vertical or lantern slide projection. 
 When the projection microscope is in position the change from micro projectionto either lantern slide, 
 vertical projection or opaque is instantaneous. 
 
 ,-.. .,■..._«-._ -^ length; carried at height of 7 in. from table by two cast iron supports of ll-in. spread with elevating 
 
 Lamp House — Measures 131 in. long, 13S i 
 metal walls, with an iiir space betw 
 taree, light-tight spring door on t 
 and provided with handle at rear 
 strong spring arm; conforms 
 
 —Hand-feed arc lamp for 
 
 high and 7J in. wide, light-tight and freely ventilated, constructed of double sheet 
 
 1 the two wall^and the roof fitted with B.&L, apecial patented ventilator; provided with 
 
 1.11.^ side and obsorvation windows on both sides; mounted between uprights at front end 
 
 r, permitting it to be easily tilted for opaque projection and held rigidly in position by 
 
 he most rigorous requirements of Boards of Underwriters. 
 
 'ternating c 
 
 Condensing System — Consists of two rear lenses of B & L triple system, 6-in. diam( 
 house, rendering light approxiniately parallel in dark chamber, and a ph 
 for lantern slide work, completing triple system. 
 
 Object Holder— Round, of heavy metal, mounted on double arm with spring hinge at each end and handle at holder i>nd; the 
 whole adjustable for height on a grooved vertical standardand provided with setscrew; will accommodate objects of widely 
 varying thickness and size, the holder always remaining parallel to base and autom.atically bringing object into proper 
 plane of projection; dark curtain in front of opening prevents hght from flooding room when object i^ being chanyeil. 
 
 Mirror Bo^ — Of sheet metal, prism shape and light-tight' mounted over opening in top of dark chamber and containing stationary 
 tn rror at su tab e angl to refle t bearr of 1 gl t tl ough lantern slide. 
 
 Project on Lenses T^o Ban 1 & Lon b Standjri lense w h rack and pinion tocusiug adjustment, that for lantern slides regii- 
 arl of a nch f s 1 n d ameter ani hat fo opaque work of 15-inch focus, 4-iii. diameter; le;iaea of other foci may 
 
 
 -Le [ 
 
 iei f 1 
 
 . ... fied 
 ■r all 3S in he ght "4 1 
 
 L n veraal Balopt on '- 
 [1 plate 61 X I'' 
 s de up to con 
 00 ed stand a J 
 
 Possbe Atachments Tien J mn 
 'illc■ce^•(^fltllv with this Baloptici 
 Price List on following page. 
 
Universal Balopticon (( oiUinuLdj 
 
 44888. Universal Balopticon, ;i.-^ ilesi riboil above, with 15-inch focus, 4-inch diameter lens for opaque objects 
 
 ;ini] s-incl) for us, l;-inih diameter lens for lantern slides, without vertical equipment 160.00 
 
 44892. Universal Balopticon, :is abovo, but with verticrd attachment 175.00 
 
 44896. " " " " " " lN-ir.i!i iiii)-. l-idrh diameter lens for opaque objects and 
 
 10-inch focus, l|-inch diameter Ion,-' i< , I i, ■ i -li'lc-; 160.00 
 
 44900. Universal Balopticon, as above, with veiln il i ! . Ii;iii nl 175.00 
 
 44904. Vertical Equipment, only, with mountiiit^ tui ai iainintrfut lu dark chamber of No. 348SS 15.00 
 
 44908. Optical Bench, carefully planed, 15 inches long, for attaching to the front end of the base of Universal 
 Balopticon to accommodate projection microscope 5,00 
 
 PROJECTION APPARATUS, BAUSCH & LOMB CONVERTIBLE, New Model, prnviding for lantern slide 
 projection, projection of opaque objects by reflected light from an area Sx8 inches, micro projec- 
 tion, projection of large and transparent objects, such as liquids or X-ray plates from a horizontal 
 position, polariscope projection, micro-polariscope projection, spectroscope projection, etc. 
 In opaque projection diaphragms are supplied reducing the area projected to 6 inches square and 4 
 inches squ'ire The use of the?e permits the withdrawal of the arc from the conden^jer systems, 
 th s p d g n eise i lUu nat o etc 
 
 Op cal Bed 
 
 Ed 
 ff 
 Lamp Hou^e 
 
 Ilium ns 
 
 Ob ect Hold 
 
 Pro ect on Le 
 
 Qgula shape 3 
 
 a h 
 
 
 a k 
 
 hamb and 
 
 !al 
 
 achmen nh h n a be ai 
 i Dg pac o up d b da k 
 
 ed 09 desired and 
 ha b 42 n ong. 
 
 nd 
 
 i^ r u 
 
 w ndon OD 
 
 n L. d 
 
 Lon 
 
 bo sde 
 
 P a 
 
 oub 
 
 en ed en 
 
 d h w n u 
 
 sheet 
 
 ator; 
 
 P ghta 
 
 ed 
 nen s of Boa 
 
 o eedn 
 
 opaque p 
 ds of I nde 
 
 es oa 
 
 Qd 5- r. h d 
 n bed k 
 
 wner> 
 
 Dd h d ng 
 
 dylQ 
 base 
 
 e n cb 
 
 hamb 
 
 m un ed dir 
 nd he 
 
 
 
 
 gh 
 
 and obae 
 
 angng 
 
 op c p 
 
 e and 
 
 o de nd he whole 
 
 da ob eota of w de va j ng 
 
 b ng ng ob e nto p ope p ane of 
 
 s b ng h Dged n h e a d ng e et 
 
 n des and o 
 
 wh h e a 
 I b d abo 
 
 gh h ough 4i n. 
 
 up gh op a bed 
 
 )G na w h ad ust- 
 
 e rs ng pnam ia 
 
 n f o 
 
 a Dee: 
 
 11 1 
 
 jg o a ng OQ ergent 
 
 d E ni ad ustment 
 n e ondenfl ng eaa in 
 '. andard n h gh, 
 
 nho e be gmoun ed 
 
 44920. 
 44924. 
 
 )\e pi t cuUrlj ecomne 1 the C on e t ble B loptitonwith laige Projection Microscope where pro- 
 jection with fheliighcr powers is to be accomplished and where immediate interchange from micro 
 prci.MTih,ii (i.riMiri l,K,(rrn .-^lidr .,f up:iqiic ohiorls is di'sJr;ihlc. The special vertical attachment 
 pro \- Ilk . V. 1 1, II,- I, I, J hi 1-^ ilir \„-<i iru'i li-i.l :i\:iihiM.' fur 1 lie projecting of X-ray plates, large histo- 
 logir;il -.iil.|i( t-, -mil ,i,- ul I lie hi;iiii, :ind ot lire 1 rans|i:icciii;ies, without reducing them to ordinary 
 lantciii.-iluli f,a.- (In^ hiir.-mi aUauliiiieiit p(uvidf.>j fur llie projection of areas uptoS inches in diameter. 
 Convertible Balopticon, complete for projection of lantern slides and opaque objects, with 15-inch 
 focus, 4-inch diameter lens for opaque objects and 8-inch focus, l|-inch diameter lens for lan- 
 tern slides 230.00 
 
 Convertible Balopticon, same as abovi>, but with l.S-imli focus 4-inch diameter lens for" opaque'objecta 
 "nd 10-incli focus, If-inch diameter h-ns for knlcm slides 250.00 
 
 Convertible Balopticon. 
 
 opa(|ue objc'ts mi 
 Set of Accessories im 
 
 port, double ......Il 
 
 bellows an<l Iruni 
 
 . but wit 
 
 ■I 111' 4 X 5 or 5 X 7 I 
 . N-inchdiamotor, 
 id, without project 
 
 ch diameter Tessar Ic lens for 
 
 ■ lantern slides 430.00 
 
 ing of special slide carrier sup- 
 mvex condensing lens, tapering 
 30.00 
 
 llu.strations of C'onverlible on following page. 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 44912. Convertible for Opaqui- and Lantern Slide Projeolion 
 
 f 
 
 %^ 
 
 1-X 
 
ARTHUR H. THOMAS COMPANY 
 
 Bausch & Louib iiuiiiufacture three different moilrl 
 Large — designed for use with their different Baloptic-oii; 
 
 signed for work with low power objectives, particularly with their Model C Baloptioi 
 are compound microscopes with both coarse and fine" adjustments and high grar!'' ■ 
 is illustrated with Universal Balopticon on page 442, and the Large with the Convi i i 
 44928. Simple Microscope, including substage condenser and three diaphragms i<<\ i 
 44932. Medium Microscope, includin;^ projection eyepiece, substage condenser ;uii 
 
 in slide carrier; witliuui n|,|(ri i\c-! 
 
 Medium Microscope, mourn . I .i. 
 
 of Projection Microscopes — the Simple, Medium and 
 
 The yimple Microscope has no eyepiece and is de- 
 
 The other two models 
 
 rilf^. 
 
 The Medium 
 111 on page 444. 
 
 Large Microscope, includini; ;iiij|mj 
 denscrs, triple revolving nn^ 
 swinging arm, without proji 
 
 Large Microscope, as above, but wi 
 
 rier... 15.00 
 phragmg for use 
 
 37.50 
 
 44936. Medium Microscope, mourn.- 1 .,i, ■.. m.^ni^i; arm for Model D or Convertible Balopticons 45.00 
 
 44940. " " mounf.i.il m ■■■ i I swinsing arm for Universal Balopticon 45.00 
 
 44944. Large Microscope, including ;iiij|M,i,. ■ | tnjr-i'iifiti eyepiece, substage water cell, three substage con- 
 
 ee diaphragms for use in slide carrier; mounted on 
 
 .... ^ . ... objectives 100.00 
 
 44948. Large Microscope, as above, but wit'i .'J U. kiI S mm objectives added 117.00 
 
 44952. Vertical Attachment for Model C Balopticon 10.00 
 
 44956. Vertical Attachment for Model D or Convertible Balopticon, with prism shaped mirror box and sta- 
 tionary mirror 15,00 
 
 449G0. Vertical Attachment for Convertible Balopticon or Model D, with rectangular dark chamber and mov- 
 able mirror permitting interchange with other forms of projection 30.00 
 
 44964. Vertical Attachment as described above, but with front standard, bellows and l^-iuch diameter pro- 
 jection lens 42.00 
 
 44968. Vertical Attachment, witli r'- ■■-■i .■ l-m \<n- n-^r with microscope 37.50 
 
 44972. Extra Front Standard for ( ' !.■ i ■,■,!,. |.iirnii 3.00 
 
 Note— When the vertical athnlimciii i.mi,:,|[is m :, pfrtnanent position on the Convertible Balopticon, 
 it is well to have an oxl.r:t rnml. sl;nid:n-il, mo that one may be used on the horizontal and the 
 other on the vertical bed. 
 
4497b. Hand-feed Arc Lamp, with ceotering support 10.00 
 
 44980. Incandescent Electric Lamp, 250 watt nitrogen filled, with silvered globe, oa support with lU-foot ex- 
 tension cable and Hubbel connection plug 10.00 
 
 44984. Oxyhydrogen Lamp, on support 10.00 
 
 44988. Acetylene Lamp with retletAtor and 6 feet of rubber tubing 8.00 
 
 44992. Welsbach Gas Lamp with connection 4.00 
 
 44996. Acetylene Gas Tank, 10 cubic ft. capacity 10.00 
 
 45000. Piano-Convex Lens, 4-iQch diameter, 6|-inch focus; rear lens of the regular Model C system, un- 
 mounted 1 .25 
 
 45004. Piano-Convex Lens, 4i^-inch diameter; front lens of the regular Model C system, unmounted. Please 
 
 state focus of projection lens when ordering 1.50 
 
 45005. Piano-Convex Lens, 4jY-iu''h di^imcter, 10-inch focus; middle lens of regular Model D system, or for 
 
 special condensing .^> .-I iin 1-50 
 
 45012. Meniscus Convex Lens, 4-iii. ■! ■ ■ ■ ' i I U-inch focus; for Model D system, or for special system 2.50 
 45016. Piano-Convex Lens, 4j|-iiii ii ■ ■ nm i. r ; front lens of the regular Model D, Universal or Convertible 
 
 systems, unmounted. I'l' m -;■ -i ;tic focus of projection lens when ordering 1.50 
 
 45020. Meniscus Convex Lens, 5^-iiiLdi dij,iiieter, 11^-inch focus; for Universal Balopticon, unmounted. . 6.00 
 
 45024. Piano-Convex Lens, 6-inch diameter, 10-inch focus; for Universal Balopticon, unmounted 3.00 
 
 45028. Meniscus Convex Lens, 6-inch diameter, IH-inch focus; for Convertible Balopticon, unmounted. . 7.00 
 45032. Double Convex Lens,7|-incli diameter, 11-inch focus; for Convertible Balopticon, unmounted. . . 10.00 
 45036. Special Condenser System for opaque projection, in the Bausch & Lomb patented vetitilated mount: 
 
 for use in place of the regular double system when using the opaque attachment 5.00 
 
 45040. Projection Lenses, Bausch & Lomb Standard. 
 
 Designation 6' 7" s" lo' lO" i2' i5* i8' 20' is' 
 
 Size of mounting ... \ i l i ^ I 's 5 2 
 
 Diameter, inches _ 1 | If If If 2rg -in -i\ '^rs 2^ 4 
 
 Each 7.00 7.00 7.00 7.00 14.50 14.50 14.50 18.00 18.00 50.00 
 
 Project'on Table for Lantern Slides (2j x 3 inch opening) giving size of picture with objectives of 
 various focus at different distance.^; from the screen. 
 
 Distance from lanfern lo screen 
 
 Cinch 
 7-inch 
 S-inch 
 
 Example: Usiog a 12-inch lens at a distancB of 4D it. from thesureeu, tlieladgest aide of the screea image 
 
 Projection Table for Opaque Objects, giving size of picture with objectives of various focus at 
 different distances from the screen. 
 
 
 4i» 
 
 5 inch Opening fi x fi inch Opening 
 
 SxSin 
 
 ch Opening 
 
 Distance from Lens 
 to screen 
 
 
 
 
 
 12" lens 
 
 15" lens 1 25" lens 15" lens 
 
 18" lens 
 
 15" lens 
 
 18" lens 
 
 
 6 
 
 4i 1 1 51 
 
 1^ 
 
 ,1* 
 
 6 
 
 20 ft. 
 
 
 
 
 
 
 25 ft. 
 
 10 
 
 
 13 
 
 lOJ 
 
 
 13 
 
 
 
 
 35 ft. 
 
 
 
 
 
 
 
 
 
 
 50 ft. 
 
 
 
 
 
 60 ft. 
 
 
 
 
 
 
 h lens used at a distance of 20 ft. from the screen will project 
 
 an Image 8 ft 
 
 
 Eiample: An IS-iac 
 
 i^quare. 
 
45044. 
 45048. 
 450.^2. 
 45056. 
 450GO. 
 
 4.5064. 
 4.50GS. 
 
 4.5080. 
 45084. 
 45088. 
 4.5092. 
 4.5096. 
 45100. 
 45104. 
 45108. 
 45112. 
 45116. 
 45120. 
 45124. 
 45128. 
 45132. 
 45136. 
 45140. 
 45144. 
 4514S. 
 45152. 
 45156. 
 45160. 
 
 Projection Stand, of metal, top 30 x 14 inehes 10,00 
 
 as above, with .slielf for accessories 12.00 
 
 " " with wooden top, 32 x I65 inches 16,00. 
 
 " " as above, with revolving wooden top 20.00 
 
 " " with strong cast iron base and frame and heavy 40 x 17 inch revolving wooden top, 
 
 with space beneath for adding cabinet, if desired, provided with castors and leveling screws 32,50 
 
 Projection Stand, as above, without revolving top 25.00 
 
 Screens, of heavy material with special white coating, mounted on spring roller. 
 
 Size, feet 6x6 7x7 SxS 9x9 SxlO 10x10 12x12 
 
 12,00 13,50 15.00 20,00 
 
 These screens give much more brilliant 
 
 Each 4,00 6,00 
 
 ,Screens, Aluminum, of heavy material with metallic surface, 
 images when angle including observers is not over 60°. 
 
 Size, feet 6x6 7 x7 
 
 Each 10.00 14.00 18.00 22,00 28.00 40,00 
 
 Screen, Aluminum, Zeiss. This screen is stretched taut on rigid metallic frame and results obtained 
 in both micro and opacjue projection are very superior to those with any other form of alumi- 
 num coated screen. Size 1.5 meter s 
 
 8^ 
 18.00 ' 
 
 _9 X 9 10 X 10 12 X 12 
 
 22,00 28.00 
 
 Duty Free 30.00 
 
 Rheostat, Fixed Form, 1.5 .ninT'cre^' 1 in volts ... 
 
 olts. . 
 
 Duty Paid 39,50 
 
 7.00 
 
 18.00 
 
 5,00 
 
 7,00 
 
 5 aiuiierr.s, 110 and 220yolts 8.00 
 
 Rheostat, Adjustable Form, 15 to 25 amperes, 110 volts 18,00 
 
 15 to 25 amperes, 220 volts 25,00 
 
 " " " 1,5 to 35 amiieres, 110 volts 27.00 
 
 Hart Standard Double Pole Snap Switch, for 35 amperes on circuits up to 250 volts 1.50 
 
 Air Brake Lever Knife Switch, front connected; single throw, double pole 2.00 
 
 Switch as above, but double throw, double pole 2,75 
 
 Approved Cartridge Fuses for 30 amperes. Each 25 
 
 Approved Cartridge Fuses for 40 amperes. Each 45 
 
 Rubber (Covered Twin Cable with No. 12 copper wire for 15 amperes, per foot 10 
 
 Rubber Covered Twin Cable with No. 10 copper wire for 25 amperes, per foot 10 
 
 Rubber Covered Twin Cable with No. 8 copper wire for 35 amperes, per foot 12^ 
 
 Cored Carbons, 18 mm diameter, 6 inches long, per 100 4.50 
 
 3,00 
 
 11 
 
 2,00 
 2.00 
 
ioH.r 
 
 C. 
 
 1981' 
 
 
 1450" 
 
 c. 
 
 2642^ 
 
 
 isso- 
 
 c. 
 
 2822^ 
 
 
 1755' 
 
 c. 
 
 3190^ 
 
 
 2050° 
 
 c. 
 
 3720' 
 
 
 3000° 
 
 c. 
 
 5430' 
 
 
 PYROMETERS 
 
 We are not manufacturers of Pyrometers and are not equipped to di'siaii or make inHtaUations of Pyrometers 
 for special purposes, as such service in every instance is better performed by the original manufacturers. It is 
 our custom to refer inquiries involving special designs to the maker who, in our opinion, is best qualified 
 to meet the requirements of the case. We are prepared, however, to furnish standard equipments, for both labora- 
 tory and works practice, from reliable makers of each type of Pyrometer and always at original factory prices- 
 As a convenience to users of this catalogue we print the following fixed points of the provisional temperature 
 scale now in use at the Bureau of Standards, Washington, D. C. (Circular No. 7, "Pyrometer Testing and Heat 
 Measurements"). 
 
 Freezing or Melting Points 
 
 Tin.. 232° C. 450° F. Gold 1063" C. 1945^ F. 
 
 Cadmium 321° C, 610° F. Copper 1083° C. 
 
 Lead 327° C. 621° F. Nickel 
 
 Zinc , 419° C. 786° F- Palladium., 
 
 Antimony 630° C- 1166° F. Platinum 
 
 Aluminum 658° C. 1216° F. Alumina 
 
 AeiCui 779°C. 1434''F. Tungsten 
 
 Silver 961° C. 1762° F. 
 
 Boiling Points (Ccntlgradel 
 
 Naphthaline , 217°, 1) + 0.058 (H - 760) 
 
 Benzophenone 305°, 9 + 0.063 (H - 760) 
 
 Sulphur 411°, 6 + 0.090 (H - 760) 
 
 TYPES OF PYROMETERS 
 
 EXPANSION PYROMETERS, suitable tor mGaaurements up to about 1400° F. These are baaed ou the relative expansion of metala or of a 
 metal aud graphite, and are widely used iu industrial eataljliahments. Such instruments should be tested from time to time to correct 
 for changeB in zero. 
 
 THERMO-ELECTRIC PYROMETERS. In pyrometers of this type temperatures are measured by the magnitude of the electromotive forces 
 act up between wires of different materials when one junction is exposed to the temperature fo be ineaaured and the other junction (or 
 junctions) is kept at some known temperature. For the measurement of temperatures in the interval 300° to 1600° C. thermocouples 
 consisting of a wire of an iridium or rhodium alloy of platinum joined to a wire of pure platinum (usually designated as rare metal 
 couples) are generally used. The most commonly used type, known as the Le Chat«lier pyrometer, consists of a wire of 10% rho- 
 dium alloy witu platinum joined to one of pure platinum. For the measurement of temperatures below 600° C. to that of liquid air 
 (—200° C.) eouijleSi known as the base metal couples, of iron-constantan, copper-constantan, etc., are used, as are also couples of iron, 
 chromium, nickel, etc., and their alloj'S. These couples are more subject to oxidation than the platinum alloys and mu.st be renewed 
 more fretiuently. 
 
 ELECTfilCAL RESISTANCE THERMOMETERS. The fundamental princinle of the Resistance Thermometer is the fact tliat a cliange 
 in the temperature of a pure metal causes a definite change in its resistance to an electrical current. The percentage change in re- 
 sistance per degree change in temperature is more than twenty as great as the percentage change in the volume of mercury with tem- 
 perature. The method of measurement employed is the Wheatstone Bridge in one or other of its forms. The bridge, instead of being 
 calibrated in ohms, is calibrated in terms of temperature and is, therefore, direct reading in temperature units. This direct re'jding 
 feature is made possible in the Leeds & Northrup product by a special method of adjustment which assures that, no matter how the 
 purity of the metal may vary, all bulbs of a given class have not only the same resistance at a given temperature but also have the same 
 fate of change of resistance with temperature. The merits of Resistance Thermometers and Pyrometers group themselves under the 
 two headings of reliability and flexibility. There is no method of temperature measurements as flexible as the resistance tKermometer. 
 Not only may the bulb be made so small that its total volume need not exceed a cubic quarter inch, but tliis requisite volume may be of 
 any desired form, flat or round, stiff or flexible. On the other hand, the bulb may integrate the temperature over as great an area as 
 desired either as a large single unit or as a subdivided unit. Further, considering the equipment as a whole, the system is most flexible; 
 any number of the various bulbs of a given class may be read on one iadicator with any length or sise of leads, and a systern already 
 installed may be increased at will by additional bulbs and additional switching facilities. In other words, all parts are electricaEy inter- 
 changeable. Further than this, the thermometer may be made, if so desired, in such form as to be practically free from thermometric 
 lag; it maj' have a wide range at all points of which it is equally accurate, or it may have a short range selected for special work, giving 
 an open scale of high accuracy. In short, throughout the range of temperature extending from the lowest known up to 1300° F. a re- 
 sistance thermometer system may be laid out to have almost any desired characteristics. 
 
 OPTICAL PYROMETERS, In optical pyrometers the intensity of the light emitted by an incandescent body whose temperature is sought 
 is measured bj- comparing the intensity of the light which the_body emits with that emitted by some standard source, such as a gaso- 
 line lamp or an incandescent lamp under specified conditions. Optical pyrometers are, therefore, essentially in principle photometers 
 adapted to meet the varying requirements of shop and laboratory use. In these pyrometers light of a single color is generally used to 
 get rid of the difiiculties in photometry incident to color diSerences and also for the reason that the laws conneotiog the temperature 
 of a body and the intensity of the light emitted are simpler it we deal with a single wave length (color) only. 
 
 RADIATION PYROMETERS. In radiation pyrometers the energy of "total radiation (i.e. that associated with the long waves which do not 
 affect the eyes, as well as the energy of the short light waves) is measured in various wavs by the heat effect which it produces, such 
 as by the electric current set up when the radiation heats one or more junctions of two disatniilar metals, the expansion produced by the 
 heating of a compound metal strip, and the change in resistance of a very fine metal ribbon. 
 
 All of the above types of Pyrometers are furnished with recording as well as indicating instruments, with the 
 exception of the Optical and Expansion Pyrometers. The descriptions given in the preceeding paragraphs are 
 mostly taken from the Bureau of Standards Circular No. 7, "Pyrometer Testing and Heat Measurements." We 
 ofTer reliable instruments of the types mentioned on the following pages. 
 
pyrometer. Expansion, Brown, with new patent impruvL-nifnt by which 1lir n 
 the same temperature no matter how much of the stem or tube abmi i j 
 heat. With new non-tarnishing porcelain dial 6^ inches in diametci .n ■: 
 stem of 36 inches intended for 12 inches insertion in the heat, 'rinsi ur 
 with cither vertical or horizontal stem and with Centigrade or Fahrcnlioi 
 
 out additional charge. With dial graduated to SOQ'' F . 
 
 Each '^ 
 
 Pyrometer, Thermo-electric, Brown Stationary Type, with round patter! 
 gr;idi).iiiil ill I'^ihrenlieit or Centigrade degrees, with base metal i 
 ufle ii|i III L'lnn l\ but for constant use at not over 1800° F. Cm 
 coupli' III priifiTlini; case, as shown in illustration, and 50 ft. of don I 
 
 Pyrometer, Thermo-electric, Brown Portable Type, similar to above but ' 
 able case. The thermo-couple is usually supplied, as in illustration, 
 
 12.00 
 
 ■u-y shows exactly 
 - i-^ inserted in the 
 ■ I Miidard length of 
 I nts are furnished 
 n:* specified, wtth- 
 1200° F . 1500° F. 
 00 
 
 4.i21fi. 
 45220. 
 
 15.00 
 
 zr millivoltmeter, 
 ■'■', for occasional 
 !i :iii inch thermo- 
 
 iMt: wire 50.00 
 
 anometer in port- 
 . . , , with a protecting cap which 
 
 is removed for instantly measuring temperatures up to 2400° F., or which can be left in position 
 for permanent installation at temperatures up to ISOO" F. For molten metals a special form of 
 liieinio-cuupic is furnished. Complete with scale graduated from 0-2400''F., with base metal 
 
 thernio-rnii|,le;ind 15 ft. of flexible w-ire 50.00 
 
 Pyrometer, Thermo-electric, Brown Recording Type, wall form for permanent installation, making 
 a perfect ink record on a daily chart with eight day clock mechanism. The instrument is fur- 
 nished at the same price in portable type for horizontal use on the laboratory table. Range of 
 temperature the same as in preceding instruments. Complete with base metal thermo-couple 
 
 and 100 ft. of leads 100.00 
 
 Note— Galvanometers are furnished with temperature scale in Fahrenheit or Centigrade degrees at 
 the same price; with both Fahrenheit and Centigrade scales or with temperature and millivolt 
 scaleK at S5.00 additional. 
 
 Accessories for Brown Thermo-electric Pyrometers. 
 
 Therniocou!)le.s, Base Metal, in standard lengths of 36 inches, complete with mount. Each 7..50 
 
 " Platinum Rhodium, in Marquardt porcelain or quartz protecting tubes as shown in 
 
 iilu.stration. For reading temperatures up to 3000° F. With iron head, porcelain block and 
 
 Ijinding posts, complete. Length, inches 12_ 18 24 27 33 36 39 50 60 
 
 Each 22.00 30.00 35.00 38!66 42.00 45.00 47.00 55.00 65760 
 
 Marquardt Porcelain Tubes, with metal caps, for thermocouples; to withstand a temperature of 
 3000° F. and with a glaze impervious to gases, but which must always be heated up slowly in 
 
 order to avoid breakage. Length, inches 12 IS 27 39 
 
 Each 3^00 4.00 6.00 8^ 
 
 Quartz Pyrometer Tubes, with metal caps,, for thermocouples, which may be inserted while cold into 
 a high ti'inporature without cracking and they have a wide application because of this feature. 
 However, they are not suitable for temperatures above 2500° F. and are not as durable as Mar- 
 quardt tubes for permanent installations. Length, inches, 12 18 27 39 
 Ettch 3.00 3..50 4..^0 "" G^OO 
 
 450 
 
45233. 
 45234. 
 45235. 
 45236. 
 45237. 
 
 45238. 
 
 45239. 
 
 45240. 
 
 45241. 
 
 No. 4S232— Galvanometer No. 45232— H^raeus Eltmtnl ivith Tubes, eLc. 
 
 Pyrometer, Thermo-electric, Le Chatelier, with Heraeus Element for temperatures up to 1600° C- 
 witli Heraeus platinum rliodiiim olcmont 00 inches long mounted in double 50 inch porcelain 
 tubes, and with latest type Siemens & ilalske pivot type galvjtnometer, in carrying case. . . 163.05 
 
 Galvanometer, Siemens and Halske pivot or suspension type, without case 75.00 
 
 Carrying case for ubove. 7.50 
 
 Heraeus Element, fill in.'lips long, bare 66.00 
 
 Porcelain Tubes, ."n in'-l"-- l-^ii;, for Heraeus Element, per pair 15.00 
 
 Heraeus Elemenl, :;'■ m. I.. - l.:ii-. bare 36.50 
 
 Porcelain Tubes, _'_ ■ ■ ■ i . , for above Heraeus Element, per pair 10.00 
 
 Heraeus Elemenl. l-^ mhIm- Iidim, bare 23.00 
 
 Porcelain Tubes, 12 ini^lus long, for above Heraeus Element, per pair 5.00 
 
 Recording Galvanometer, Siemens & Halske Pivot type, for use with anv of the above Heraeus 
 
 Elements a.s a lierording Pyrometer \ 180.00 
 
 POTENTIOMETER INDICATOR (THERMOCOUPLE POTENTIOMETER) Leeds & Northrup, a new Precision 
 Instrument for use with Thermocouples and which greatly increases the range of their usefulness in 
 both laboratory and shop practice. The instrument is based upon the potentiometer principle, so 
 simplified in design as to be used by an ordinary workman. Some of the essential facts and advan- 
 tages of this Indicator are as follows: — 
 
 The potentiometer indicator when calibrated in terms of millivolts may be used accurately with 
 any thermocouple, regardless of its length, cross-section, or materials, or the length of its leads. 
 
 Many kinds of base metal thermocouples retain their calibration four or five times as long with 
 this indicator as with a millivoltmeter. 
 
 It is completely portable and requires no levelling. 
 
 It has a scale 16 inches long— at least twice as long as the usual millivoltmeter; this means at 
 least twice the accuracy in reading. 
 
 The thermocouples may, if desired, be long enough to have their cold ends located at the switch- 
 board, thus having an equipment with one cold end. 
 
 The cold end temperature may be compensated for in the instrument. 
 
 451 
 
1 WVkWvV WAWUV • — 
 
 O THE BMO cot ?I.C 
 
 No. 45250 — Polentiometer Indicator 
 
 5C TC 
 Nu. 45250— Klectrical Scheme 
 
 The illustration uf No, 4.">2rin 
 regular routine readiii.L; i^. ial,rn 
 from the rubber pla If I ■ i i r - 1 ' i - 1 1 . 
 
 At intervals of >.■!■■ - iv I 
 
 inserted in the key \\;r\^ :ii iln; 
 should be depressed and the galv 
 keyed so that it may be removed 
 
 In course of time the dry eel 
 to secure a !i:i! n.i . w I ■ n 1 1 !■ I < - 
 replace thi' ih ■ |! i ; ■. ! ■ ■ ■ 
 cell may now I- .1 i , i i . i ■ 
 merits whiidi .■m- i ^ In i>ri umhoi 
 I'onsistin^ <if two 1: 
 
 Xo.4.r250 Indie 
 irii'Tit direct rr-arlinu 
 
 vcs :i \-\i'\v of tli(; Iiidicator looking down on the faueof the instrument. The 
 \ l|l■|n■(■,-^it1L;■ Hie l^f.v marked TC and by turning the handle which projects 
 
 '_ . I > ' I'l' III .1 1 1.1 1. 1 nee. The reading is given by the scale under the index. 
 
 M.i I. I I lull.' ~l.i« n in the top of the box in the illustration should be 
 
 i..r ..r liir 1.1.., ..- ^^ll!wn in the illustration of No. 4-5250. The button SC 
 uiinieiei hmui^lii III J balance by turning the keyed handle. This handle is 
 (I pie\cnl hi in| PI] in;! with the setting. 
 
 of the roi[i|iiiieiii will becouie exhausted. At this time it will be impossible 
 
 ■ill- ~.i ' ; ■ ill luesscd. The dry cell used in the indicator is a No. 4 Columbia. To 
 
 ■ ■ .|'-iile down and remove the panel in the bottom of the case. The dry 
 
 .1 I ■ I uiect the new cell with its polarity the same as the old. For instru- 
 
 iK:iiie)ii I', lni:v!.ed at One polut, we wouM recommend the use of an external battery 
 (■ cells (as Columbia No. 6) in parallel. 
 
 provided with an auxiliary cold end adjustment, which, in effect, makes the instru- 
 ; apiie:irs ill the illustration as the small index and short scale lying just below the 
 ni.-iiii .-■■ ill '1 In- -II .ill -I'lli 1 ■ -i' Mil !' - iii.li \ ; I :i imiiit Corresponding to the cold end temperature, and the 
 
 rem hi ■■ . . ■,. Ml- 1 1 ■ I I . II . I _.|| .■. 1 1 1. II I IT il, I end correction, 
 
 Ti ■ I'lii' ■■ 'II ■■ III! !■ ■ I ■III iiiLi against the electromotive force to be measured a con- 
 
 liiiiini)-!'. ■. I,ii III. ..'.I .Iriii.. i;, .1 , Wln.'ii Uio two are equal, the measurement is complete. The 
 
 oite ration of readinji, as tle:5cribeil iibovc, i.-onsistsof balancing the electromotive force of the thermocouple against 
 the fall in potential caused by the current flowing from the dry cell through any portion DG of the slide wire 
 DI" Csee diaKr:iniV Sini'c the dry cell is not constant, the adjusting rheostats RR', are provided to maintain 
 the i-iirii ii[ inr 'iiiit. By varying HR' the current flowing is adjusted until the drop between and D is just 
 equ;il !i - 1 ■ :linl rell voltage. It is this operation which is performed when adjustment is made with re- 
 
 mo \ ril I ' I'll tieiilar attention is drawn to the fact that the Indicator may be used with any thermo- 
 
 coii|ili ill'- I. I- in millivolts as it is regularly furnished. If scale is to be graduated in degrees of temperature 
 lite eiMiple vMili which it is to be used must hi- sent tu (he factory for calibration with the Indicator. Indicator 
 witli laiiiie in iiiilbvolts from to 16 is intrmlod l'n\- nse' with rare metal couples and from 0-40 or 0-70 with 
 
 l):i>.e niel ,tI eoll|iles. PricOS do not iucludo I hetltioi nh'S. 
 
 45242. Potentiometer Indicator, as above, without cold end compensation range, 0-10, 0-10, 0-40 or to 70 
 
 inillivnlts 125.00 
 
 45244. Exlra for other ranges whether calibrated in millivolts or in temperature units 5.00 
 
 45248. Extra for double range 20.00 
 
 45250. Potentiometer Indicator, as above, with cold end compensator ranges, 0-10, 0-16, 0-40 or 0-70 
 
 millivolts 140.00 
 
 452.52. Extra for other ranges whether calibrated in millivolts or in temperature units 5.00 
 
 TEMPERATURE INDICATOR. Leeds & Northrup Balance Type, for use with all Resistance Thermometers of 
 class A, 40-260° F.,Clas.sB, up to 1000° F., and Class C, to 1800° F.. as listed below. The Indicator con- 
 sists of a direct reading Wlicatstone Bridge with a self-contained Galvanometer of new design and great 
 sensitivity. The Indicator is calibrated to read directly in degrees of temperature when connected to 
 any bulb of a given class. The total length of the scale is 16 inches and, as a balance may be readily 
 obtained to -^nd of an inch, the Indicator is easily read to rs-ths of 1%. To make a reading with this 
 
ARTHUR H. THOMAS COMPANY 
 
 i 
 
 Nil 4 4 Timpir^lur IndJcalnr No. 452lil) 
 
 Indicator, depress kej to Loiiiittt in battel \ and turn the scale until the galvanometer is at its balance 
 position at which time the position of the m ale on the index gives directly the temperature. The oper- 
 ator in thu=! reading balances the budge m such a reading atl questions of galvanometer caiibration 
 are eliminated. On this account a balunre method is always more accurate than a deflection method. 
 45254. Temperature Indicator, as above, complete in carrying case, with galvanometer and battery; but 
 
 without resistance bulb; length of scale 16 inches; case 9^ x 5| inches; weight 5s lbs 70.00 
 
 RESISTANCE BULBS, CLASS A, for use witli the above Indicator. These are electrically "interchangaable and 
 differ only in the style of mounting used. They are regularly furnished in the following ranges:^ 
 -40° to 120° F., +10° to 110° F., 30° to 250° F.. -20° to 120° C. and -30° to 50° C. Ranges other 
 than those listed cost $5.00 additional. 
 4525G. Resistance Bulb, for General Service. This bulb is about as quick acting as the ordinary commercial 
 mercury bulb. It has been designed to secure a maximum of strength and is practically inde- 
 structible. The leads are firmly anchored to the bulb. Tube is of brass with dull black lacquer ; 
 
 diameter of tube | inch ; length of winding 2 inches with length over all 5 inches 10.00 
 
 45260, Resistance Bulb, Quick Acting. Tliis bulb will follow temperature changes about as rapidly as will 
 a long bulb mercury thermometer and may be inserted into mercury without injury. Tube is 
 of steel with ebonite head; diameter of tube j inch; diameter of head I inch; length of winding 
 
 Ij inches and 4j inches length over all 14.50 
 
 45264. Resistance Bulb, with Non-conducting Case. This is exactly the same as No. 45256 except that the 
 stem is encased in ebonite. This construction is especially desirable when the bulb is to be 
 used when considerable temperature difference will exist between the stem and the sensitive 
 end of the bulb. The non-conducting stem prevents conduction of heat along its length. This 
 bulb may be employed as "wet bulb" in hygrometry with success. Diameter of stem ys inch: 
 
 other dimensions same as No. 45256 12.00 
 
 452fi8. Resistance Bulb, with Lead Covered Leads. This bulb is the same as No. 45256 excepting that it has 
 lead covered leads. The lead cable is soldered with waterproof joint to the stem of the ther- 
 mometer and, in ordering^ a sufficient length of lead covered lead should be ordered to extend 
 beyond the moisture zone. The cable used is J inch outside diameter with j^th inch wall. As 
 widely used in the U. S. Department of Agriculture for soil investigations. \\ itli one foot of 
 
 leads 11.00 
 
 Extra per foot for additional length of leads 15 
 
 RESISTANCE BULBS, CLASS B, for use with above Temperature Indicator in ranges, as follows :200°-1000°F., 
 
 50°-550° F., 50°-550° C. and 0-250° C. These bulbs are electrically interchangeable with each other in 
 
 Class B and with those of Class C. The material is bare platinum wound on mica which is protected 
 
 by a case of pure nickel willirml. ihf iisp of porcelain. 
 
 45272. Resistance Bulb, Round, ]n in'ln- \'<'vj.: length of winding and stem 10 inches; length of winding 3 
 
 inches; diameter «f h ili: i. ■ I. ..f head U inch 28.00 
 
 Extra per inch for iinll.s IrniL'yr I lian 10 inches 75 
 
 45276. Resistance Bulb, Quick-acting Tj-pe. In this bulb the platinum wire is wound on a thin sheet of mica 
 and this in turn insulated by a thin sheet of mica laid on each side of the flat coil. This is 
 inserted into a flattened metal tube. The stem is left round. The large surface of this type 
 of bulb and its low heat capacity make it extremely quick in its action ; in a liquid it is practically 
 instantaneous in its action. Length of winding and stem, 10 inches; length of win<ling 4 inches; 
 
 thickness at winding ^nd inch; width at winding h inch; diameter of stem fth inch 32.00 
 
 Extra per inch for Bulbs longer than 10 inches 75 
 
 Extra if bulbs nre to be used in pressures of over 50 lbs. per square inch 2.00 
 
RESISTANCE BULBS, CLASS C, for use with the above Temperature Indicator in the following ranges; 800°- 
 1800° F., 2O0''-18O0''F., 500°-1000° C. and 0-1000° C. These Bulbs are electrically interchangeable with 
 each other and with those in Class C. The resistance material used ia an especially pure platinum 
 wound on a mica cross. The mica of this cross is treated by a process which leaves it of a hard, non- 
 transparent, rock-like structure. In the standard type of construction this platinum wound form is 
 encased in a Royal Berlin glazed porcelain tube. A clear quartz tube is at times desirable although 
 it is slightly more expensive. 
 45280. Platinum Resistance Bulb, for measurements of the highest precision; porcelain tube with fibre head; 
 length of bulb 3 inches; diameter of tube Hths inch; entire length of tube 19 inches; diameter 
 of head Ij inches. These Bulbs are widely used in permanent installations for some of the 
 largest chemical works in the U. S.. When used in connection with the above Temperature 
 Indicator No. 45252 the accuracy of the readings without correction is 3° in 500° or 6° in 1000° of 
 
 range '. 60-00 
 
 45284. Platinum Resistance Bulb, of same construction as No. 45280, When bulbs of this type are used m 
 connection with No. 45252 the accuracy of the readings without corrections and direct from the 
 
 scale is 8° in 500° or 12° in 1000° of range 40-00 
 
 45288. Extra per inch for Bulbs over 19 inches in length 50 
 
 No- 152% and No. 1-5301— Teniperalure Recorder. Curve Priming Type 
 
 TEMPERATURE RECORDERS, Leeds & Northrup Patent, for use with Leeds & Northrup Resistance Ther- 
 mometers of class corresponding to the range required, and for use with Thermocouples. Consisting 
 of ;i patented mechanism for moving with ample power a pen, print wheel, or other device, in response 
 fo tlic necessarily feeble deflecting forces of a sensitive galvanometer. These Recorders are furnished 
 ill the T'urvcd Drawing Type for one temperature point, and in the Curved Printing Type for from 
 two to sixteen temperature points. Motors will operate on 100-120 volts, a. c. or d. c, or 220-250 volts, 
 a. c. or d. c, as specified. The jiaper speed is 3 inches per hour. The record in the Curve Drawing 
 Type is made in ink by a pun, hthI in ilie ( 'mvr Printing Recorder by a print wheel drawn on a track 
 by power supplied by the mt^^itm Imt runlinllerl by the temperature. The process is entirely mechani- 
 cal, only the motor and the nirasiirinjr riri'uit involving electric current. The speed of the motor is 
 automatically held constant even though the voltage on the line on which it is operated varies through 
 a range of 20' , . 
 45292. Recorder for Resistance Thermometer, Curve Drawing Type, for one temperature point. This instru- 
 ment i.s a recording Wheatstone Bridge. When for use with resistance bulbs the recorder is 
 calibrated to record directly in temperature units. The accuracy of the recorder is equal 
 to ^% of the range of the instrument. The distance separating the recorder from the bulb whose 
 temperature is being measured is without effect upon the record. Should it be desired to use 
 the same recorder with different bulbs at different distances from the recorder this may be done 
 by providing a suitable hand operated selector switch. The resistance thermometer has no 
 feature corresponding to the "cold end" of a thermocouple. The indications of the recorder 
 
 are controlled solely by the temperature of the sensitive end of the bulb 200.00 
 
 45296, Recorder for Resistance Thermometers, Curve Printing Type, for temperature points as indicated. 
 
 Number of points 2 4 6 8 10 12 14 16 
 
 Each 300.00 330.00 360.00 390.00 420.00 450.00 480.00 510.00 
 
ARTHUR 
 
 THOMAS COMPANY 
 
 45316. 
 45320. 
 45324. 
 
 45328. 
 
 Recorder for Thermocouples, Curve Drawing Type, for one temperature point, similar to Nq. 
 45292 except this instrument is a recording potentiometer. To record temperature it may be 
 used with any thermocouple of any length, cross-section or material. With any thermocouple 
 the accuracy of the record is entirely independent of the resistance of the leads and, therefore, 
 of their length, cross-section and materials. For ranges of 15 millivolts and over, the accuracy 
 of the record is 5% of the range; 15 millivolts are equivalent to about 1500° C. on a platinum 
 platinum-rhodium couple and to about 275° C. on an iron constantin couple 250.00 
 
 Recorder for Thermocouples, Curve Printing Type, for temperature points as indicated. 
 
 No. of points 2 4 6 8 1 12 14 16 
 
 Each 400.00 430.00 460.00 490.00 520.00 550.00 580.00 610.00 
 
 Extra for special range 30.00 
 
 Extra for special paper speed 10,00 
 
 Recorder Pen 1-50 
 
 " Paper, per roll of 25 yards 2.50 
 
 " Ink, per bottle 25 
 
 Pyrometer, Siemens Water, for temperatures up to 1000° C. or 1800° F. The metallic cylinders sup- 
 plied with the pyrometer are exposed to the heat to be measured after which they are carefully 
 inserted into the vessel containing exactly 1 pt. of distilled water. The rise in temperature of 
 the water is measured by the mercurial thermometer furnished with the outfit. This reading 
 added to the temperature of the water before the insertion of the heated cylinder will give the 
 temperature of the fiue, furnace or heated space in which the metal cylinder has been placed. 
 Dut> Free 21 00 Stock 35.00 
 
 45332. Pyrometer, Optical, Mesure and Nouel, for temperatures up to 1500" C, consisting of a quartz plate 
 Q interposed between Analyzer A and Polarizer P. When polarized light which is not mono- 
 chromatic passes through a properly prepared quartz plate, the plane of polarization is rotated 
 through an angle the magnitude of which depends on the wave length of the light and the thick- 
 ness of the quartz. The field will, therefore, appear colored according to the composition of the 
 light which passes through the instrument. When an incandescent body is viewed through the 
 instrument the analyzer is rotated until the sensitive tint is observed. The reading on the 
 circle C determines the temperature to be measured with the aid of the scale furnished with the 
 instrument. Complete in leather case. 
 Duty Free 32.50 Duty Paid 46.80 
 
 45336 Large Objective for use with above for ac-urate observations of temperatures below 900 C. 
 
 Duty Free 11.25 Duty Paid 16.20 
 
ARTHUR H. THOMAS COMPANY 
 
 Opfical Scheni' 
 
 Standardi/,ali.>n of Osram Lam 
 
 t Reading Tfi 
 
 e Scale 
 
 n Operation 
 
 PYROMETER. WANNER OPTICAL, 1914 Model, consisting of a photometric telescope containing a standard 
 Osram lamp with which the quantity of light emanating from the heated mass to be measured is com- 
 pared. The Osram lamp must be standardized from time to time by adjustment with a standard Amy! 
 Acetate lamp and current from the accumulator supplied must be controlled by means of a rheostat 
 and ammeter. The new 1914 models listed below are distinctive from the instruments Eisted here- 
 tofore in that the whole range of temperature from 650° to 4000° C can be measured on one instru- 
 ment, whereas with the old outfits two instruments are necessary to cover the entire range. The prices 
 have also been distinctly rciluced on the new models. Home of the distinctive features embodied in 
 the new 1914 model are as follows: — 
 
 Optical parts enclosed in polished metal protecting lube of unirorm diameter. 
 
 Adjusting glasses placed entirely within the tube but adjustable from outside. 
 
 Simplilied arrangement for interchange of incandescent lamp after removing outside lube. 
 
 Direct reading temperature scales very legible because of white graduations on black ground. 
 Outfits are complete for operation excepting the charging of the accumulators. Any of 1 he Pyrometers 
 are furnished with certiticate of the Physikalisch-Technische Rcichsanstalt at an extra cost of 310.50 
 duty free and S14.00 duty paid. 
 Pyrometer, Wanner Optical, for temperatures from 650° to 1200° C, as above described including 
 
 amyl acetate lamp, support for standardizing, ammeter, resistance and 
 
 accumulator; with graduations in degrees of arc and separate tempera- Duty Free 
 
 tur.' sr-:dr 105.00 
 
 Pyrometer, ;i^ almve, but with direct reading temperature scale 112.50 
 
 Pyrometer, Wanner Optical, for temperatures from 650° to 2000° C, complete 
 
 as above, with graduations in degrees of arc and separate temperature 
 
 scale 135.00 
 
 Pyrometer, as above, but with direct reading temperature scale 142.50 
 
 Pyrometer, Wanner Optical, for temperatun -■ fi uni (i'n" 1u 3000° C, complete, 
 
 with graduations in degrees of arc .■ -i i. i -■ triapcrature scale 142.50 
 
 Pyrometer, as above, but with direct reaihi j ■ ■ ., ■ i ■ ire scale 150.00 
 
 Pyrometer, Wanner Optical, for tern pe rat urL:-_. riuiu (JU W 4000° C, complete, 
 
 emp' 
 
 45.340. 
 
 45344. 
 45348. 
 
 45352. 
 45356. 
 
 45360. 
 4.5364. 
 
 Duty Paid 
 140.00 
 
 1.50.00 
 
 180.00 
 190.00 
 
 190.00 
 200.00 
 
 45368. 
 4.5372. 
 
 45,380. 
 45384. 
 
 45388. 
 45392. 
 
 with graduations in degrees of arc and separate temperature scale 165.00 
 
 Pyrometer, as above, but with direct reading temperature scale. 
 
 Pyrometer, Wanner Optical, for temperatures from 600° to 7000° C, complete, 
 with graduations in degrees of arc and separate temperature scale 
 
 Pyrometer, as above, but with direct reading temperature scale . 
 
 Accessories for the Wanner Pyrometer. 
 
 Protecting Case for the Pyrometer proper and adjusting support. .,..,,.,... 
 
 Amyl Acetate, tested, per bottle 
 
 Note — The above Protecting Case and a bottle of Amyl Acetate arc regularly 
 sent out with each outfit unless specifically ordered to be omitted. 
 
 Incandescent Lamp 
 
 Tripod Support, adjustable in all directions and folding for convenient carry- 
 ing; very convenient in factory use 
 
 Accumulator, in box with leather strap, but without ammeter, resistance or 
 contact 
 
 Ammeter, resistance and contacts for above 
 
 172.50 
 
 195.00 
 202.50 
 
 4.50 
 1.05 
 
 16.50 
 25.50 
 
 220.00 
 
 230.00 
 
 260.00 
 
 270.00 
 
 6.00 
 1.40 
 
 22.00 
 34.00 
 
 456 
 
Laboratory Combination of Wanner Pyrometer and Konlg Spectrophotometer, jjaitiLulm ]y ic commend eel 
 for laboratory measurements of both temperature and iil^sorption investigations in spectro- 
 
 photometry; with small scale with absorption angle only, for tempera- 
 tures up to 2000° C 
 
 45408. Laboratory Combination, as above, for temperatures up to 4666° C 
 
 45412. " " " " but with large scilt. including poliiiaitio 
 
 angle device and temperature scale, for temper ituie^! up to 2000° C 
 45416. Laboratory Combination, same as above, but for terapei itun s up to 40011° f 
 
 Duty Free 
 195.00 
 225 00 
 
 Dutr paid 
 260.00 
 
 300 00 
 
 2S0 0(1 
 
 3J0 (Id 
 
 
 PYROMETERS, THWING TOTAL RADIATION, for tlie iLccurate measurement of high temperatures, based on 
 Stefan-Boltzmann Radiation Law, i.e., the enotgy radiated by a black body is proportional to the fourth 
 
 power of the absolute temperature. With no upper limit, and used c (.j. t. i 
 
 as low as 500° C. Radiations of heat from a black body, or body under I'l ■. i> ■ 
 enclosed furnace, are concentrated by means nf a receiving tube on n pcn-i 1 
 
 conveyed to the galvanometer, where fempprnl nrc^- ;irc rr.;\d (liri'cth- in .|. :: ■ .■ 
 
 have but small heat equilibrium, 
 receiving tube being held in the h.in.i 
 No focussing is required as the instrun 
 
 temperatures 
 litions as in an 
 uple and hence 
 thermocouples 
 is required, the 
 o be measured. 
 IS the diameter 
 
Thwing Radiation Pyrometer (Continued) 
 
 of the surface is 1 inch for ear^h S inches (<" 'li-l 'H- 
 
 less for instruments of hiRher range. Aiiv i ■ ■ 'I ■.■■ i .'i 
 is required other than to point the reccn. ii;^ ' i ■■ ■<■ i 
 
 scale. The outfit is not dependent upon slur;ijit_' li. n 
 
 perception of the observer and is equally accurafi.' m .li'c 
 and not affected by extraneous light falling upon i In' li'i' 
 trcraely sensitive and highly accurate. Complete mil in vicii^iis / ids. 
 
 Pyrometer. Thwing Portable Indicating Radiation, with any single range temperature scale, eom- 
 ! 120.00 
 
 [■■iiiLjc iiiyl (Niuent and correspondingly 
 i:iii [i[iii;ii(' I lie instrument aa nothing 
 il. :iiirl tr;iil (he temperature from the 
 iiiiLud uf Uiinmosity or upon the color 
 ; temperature of hot metals in the open 
 I'ved. Galvanometer is dead-beat, ex- 
 
 4.5420 
 4ri424 
 
 pi CI 
 
 4542S. 
 45432. 
 
 4543 S. 
 
 43440. 
 
 Pyrometer. Thwing Portable Indicating Radiation, with any double range temperature scale, as 2500° F. 
 to 3600" F., 2000° C. and 1400° C. These two scales are especially suited for open-hearth furnace 
 work, giving correct temperatures of molten steel in the furnace and while pouring. Com- 
 plete 130.00 
 
 Pyrometer, Thwing, Wall Pattern Indicating Radiation, with ventilated receiving tube for permanent 
 installation above a furnace, or barium chloride bath 120.00 
 
 Pyrometers, Thwing, Recording Radiation, in single and multiple record units. These Pyrometers have 
 been found of extreme value on cement kilns, in copper smelters, incinerators, sintered ore plants, 
 etc. With single record recorder 180.00 
 
 Pyrometers, Thwing, Recording Radiation, as above, with two record recorder 245.00 
 
 Note— Prices of Multiple Records up to 15 records on a single 10 inch chart, quoted on request. 
 
 Pyrometer Cones, Seger, for temperatures from 600° C. to 2000° C. 
 
 Per box of 100 1.00 Each, in quantities less than 100 05 
 
 The following are the official melting points: — 
 
 Cone 
 Num- 
 ber 
 
 npiirces 
 Cenliurade 
 
 600° 
 
 Cone 
 Num- 
 ber 
 
 D,„ee. 
 Centigrade 
 
 Cone 
 Num- 
 ber 
 
 Decree. 
 Cenligrade 
 
 Cone 
 Num- 
 ber 
 
 023 
 
 or 2a 
 
 855° 
 
 02a 
 
 1060° 
 
 9 
 
 (CT 
 
 650° 
 
 011a 
 
 880° 
 
 Ilia 
 
 1080° 
 
 10 
 
 (M) 
 
 670° 
 
 OUa 
 
 900° 
 
 la 
 
 1100° 
 
 11 
 
 019 
 
 690° 
 
 09a 
 
 920° 
 
 2a 
 
 1120° 
 
 12 
 
 018 
 
 710° 
 
 IIKa 
 
 940° 
 
 3a 
 
 1140° 
 
 13 
 
 017 
 
 730° 
 
 07a 
 
 960° 
 
 4a 
 
 1160° 
 
 14 
 
 016 
 
 750° 
 
 06» 
 
 980° 
 
 5a 
 
 1180° 
 
 15 
 
 015a 
 
 790° 
 
 05» 
 
 1000° 
 
 6a 
 
 1200° 
 
 16 
 
 OMa 
 
 813° 
 
 04a 
 
 1020° 
 
 7 
 
 1230° 
 
 17 
 
 013a 
 
 835° 
 
 03a 
 
 1040° 
 
 8 
 
 1250° 
 
 18 j 
 
 Degrees 
 
 1280° 
 1300° 
 1320° 
 1350° 
 1380° 
 1410° 
 1435° 
 1460° 
 1480° 
 1500° 
 
 £™ I Degr... ' «"• ! Degree. 
 bS Centigrade "™- ! Centlgnd. 
 
 1520° 
 1530° 
 1580° 
 1610° 
 1630° 
 1650° 
 1670° 
 1690° 
 1710° 
 1730° 
 
 34 
 35 
 36 
 37 
 38 
 39 
 
 1750° 
 1770° 
 1790° 
 1825° 
 1850° 
 1880° 
 1920° 
 1960° 
 2000° 
 
 Pyrometer Tubes, Alundum, impervious to gas under normal pressures tlirough a wide range of tem- 
 perature. With a liigh deformation point which, in connection with their imperviousness and 
 high thermal conductivity, recommend them for this purpose. The tubes all have an internal 
 diameter of tV inch and an external diameter of xi inch and are furnished with flange 
 
 Length, inches 12 __ 18 2^ 27 30 36 42 
 
 Each 2.40 3.60 4.80 5.40 G.OO tTziT SM 
 
QUARTZ APPARATUS, TRANSPARENT. Pure Fused Rock Crystal. Hark rryslul ha< a vr-rv Rinall coefficient 
 
 of expansion, will not crack on subjection to the most violent and suddn^ i Ij.ui'i'.- nil finperature and 
 
 is insoluble in water and volatile acids, with the exception of hydrofiu'n i' ■ ■ i ■ uclting point of 
 
 approximately 1600° C. The coefficient of expansion between 0° an<l 1 ■ ■■ ■ ' . n, 00000054. The 
 
 specific weight is 2.22. The coefficient of expansion for D is 1.4585 anil a,r .Ii-'^.m'! -inn from C — F is 
 0.00676. ^ It is transparent to ultra violet light above 185 /x/x For prices on I )|xique Fused Silica ware 
 see headings of various apparatus, i.e., Beakers, Crucibles, Flasks, etc. 
 
 45500. Beakers, Transparent Quartz, conical shape, either with or without spout. 
 
 Capacitv, cc 30 50 100 200 
 
 Diameter^ nit.i 35 42 53 63 
 
 Each sTfiO 4.80 ~8.00 ~ HM 
 
 45504. Crucibles, Transparent Quartz, without lids. 
 
 Capacity, cc 10 20 30 50 80 100 
 
 Diameter, mm 2S :35 40 50 58 _6_5 
 
 Each 2.40 3.95 4.75 7.09 9,00 lOTSO 
 
 4.5508. Uds, Each 1. 00 1.75 2.25 -3.00 4.25 5.00 
 
 45-512. Dishes, Transparent Quartz, round bottom, with or without spout. 
 
 Capacitv, cc 10 50 100 200 275 
 
 Diameter, mm 34 GO _ J75_ 98 196 
 
 Each 2.90 4.80 ' 7.25 12.00 16.00 
 
 45516. Flasks, Transparent Quartz, flat bottom, Erlenmever shape. 
 
 Capacity, cc ." 50 100 200 300 
 
 Each 4.00 7.25 11.00 16.00 
 
 45520. Flasks, Kjeldahl, Transparent Quartz. 
 
 Capacity, cc 100 200 300 700 
 
 Each 7.25 tl.OO 1.5^00 " 20.00 
 
 45524. Retorts, Transparent Quartz, plain. 
 
 Capacity, cc ^50 100 200 5^00 
 
 Each 7.50 10.00 " 15.00 " 27.50 
 
 45528. Retorts, Transparent Quartz, with tubulature. 
 
 Capacity, cc 50 K)0 _ 200 500 
 
 Each 8.50 11.25 16. .50 29.59 
 
 45532. Test Tubes, Transparent Quartz. 
 
 Length, mm 100 100 150 150 200 200 
 
 Diameter, mm __15 20_ _15 J^P _ ^•> 20 
 
 Each 2.50 3.25 3.75 ' 4.75 5.00 6.00 
 
 45536. Tubing, Transparent Quartz, with walls .5 to .75 ram. In lengths up to two feet. 
 
 Bore, mm 1-2 3 4-5 6-7 8_ 9-10 11 
 
 Per foot .. .95 2.00 " 2.65 3.10 3.65 4.25 4.75 
 
 Bore, mm 12-13 14 15-16 17-18 10 ^22 25 
 
 Per foot 5.25 5.75 6.25 7.75 8.60 10.00 11.00 
 
RADIO-CHEMISTRY APPARATUS 
 
 45540. Radio-Active Minerals, consisting of the strongest minerals from which radium is being extracted. 
 Radiographb may be taken with any of Ihc'^c specimens by placing the mineral or ore on the 
 sen'^itive side of a plate m a black and orange cover and allowing same to remain in a dark place 
 fur two or thiee days, after which development is carried on in the usual way. The specimens 
 in this ( ollc( tioii and then lo( alities an- as f()llo\\ s — 
 
 Pitchblende Joachimstli 1 \utunile Portugal 
 
 Carnotite ( olorddo Aeschyniie Ural 
 
 Fergusonite f eylon Tantalite Sweden 
 
 MonaziCe Praail Pilchblende Cornwall 
 
 Samarskile Nornai ( level te Sweden 
 
 Thonle ( tj Ion Orangite Norway 
 
 Collection i I \ i 1 t\\ h o specimens 7.50 
 
 '"Jmiuiimimiuuum!""'' 
 
 Spinthariscope, a fluorescent screen over •. 
 When viewed through the magnify 
 vations are made in daylight it is in 
 fore scintillations arc phiinly vi.siMi 
 mcnt and expi-isurc-^ m/hir nu plm i' 
 
 Standard Battery, Krueger, ; ii ■ 'i ■-i. 
 
 resistance, Witli si\ h rii]iii;Ll>.. . 
 
 scopes, etc. 
 
 Duty Free 
 
 j-active substance- 
 I I 'I lilt M intiUationb an nbseived. When obser- 
 1(1 iin ID i d irk room toi about five minutes be- 
 1 1 1 1 1 I 1 1 uin photogr iphs m i} be made with the instru- 
 ir ncg:itivcs by removing the magnifying lens. . . . 2.50 
 ^i-urements, consisting of 100 Weston Normal Elements 
 force of about 100 volts and with 105 ohms internal 
 I'd in charging electrometers, standardizing electro- 
 Duty Paid 24.00 
 
 idy for use 
 ■tlroscope, Curie Type, portable model of American make for i'wld u.~<: in tin- dilrfiniiiation of the 
 radio-activity of American ores, snch as the Colorado (".';iriinl.iie, ;i(mI as n^^ed in the U. S. 
 Bureau of Klines laboratories for this work. The illustration slmu-, liir dn^r of the ionizing 
 chan.l>rr (dosed so thiit the circular plate, on which the inmil.Ted (,re for testing is placed, is 
 nol sIm.>/.. !i. TIk- lyistrairnhi. !.■■ in mi -I. id \v m I, ■: n/ading microscope with millimeter scale in the 
 
 oculai , III M ; I.I .■ I ..■ I. ,.r. I In the case are provided receptacles for two 
 
 stamhi:.li,,r.l .-.a 1,1 ill. . I,, I .;,■,, .1 : in., „ .. lj,,ted below. In the field the testing is made 
 
 by moat-iJNiiy, i.iic raii- nl l^dl ut ihe leaf w il,h liie ore to be tested as compared with a standard- 
 ized ore of known Uranium content. With vulcanite charging rod and descriptive circular as to 
 
 operation 50_0(, 
 
 Carnotite, powdered to 00 mesh, with percentage of Uranium Oxide fU.iOa) determined by Ledoux & 
 Co., for use as a reference standard with above Electroscope. Per 50 gram vial 1.50 
 
ELECTROSCOPE, CURIE, original French make. This instrument is furnished with equipment for measuring 
 the radio-activity of solids, liquids and gases and also in a small portable form for field work. The 
 laboratory form for solids is conveniently arranged so that measurements of a great range of radio- 
 activity as coinpared with that of Oxide of Uranium are possible. These adjustments are accomplished 
 either by varying the area exposed on the plate "D" of the material to be measured or by changing the 
 form of the discharging rod "T". Illustration No. 45540 shows the Electroscope as arranged for solids, 
 No. 45544 for liquids and gases and No. 45548, the portable form for field work. Each instrument is 
 furnished with reading microscope "M", with micrometer scale on the ocular, with which the fall of the 
 leaf during discharge is very accurately measured. The principal constants of this apparatus as 
 furnished by the French makers are as follows;^ 
 
 The potential required to deviate the leaf through the entiru field of the microscope is about 300 
 volts and the value of each division in the eyepiece micrometer is 0.4 volt but readings may be esti- 
 mated to 0.1 volt. The capacity of the Electroscope when mounted on a cylinder of 3 liters is 14 to 15 
 cm, this capacity being independent of the angle of deviation. The speed of the spontaneous fall 
 of the leaf under the best conditions, for instance 0.0033 div/sec, is 0.0013 volt/sec. Ihe minimum 
 speed of the fall measurable (ten times as great as the natural leak) is 0.01 volt/sec. The minimum 
 current measurable in the cylinder is 2 x 10-'^ amperes. The minimum quantity of radium emanation 
 measurable in the cylinders of 3 liters is 0.0019 mmg. min. The minimum amount of Radium Bromide 
 which can be estimated by the emanation method (this quantity corresponds to that contained in 10 
 liters of sea water or in 50 grams of deep sea sand) is 2, 3. 10-" mmgr. See il/. Joty, Fhil. Mag., mars el 
 juillel 1908. The minimum radio-activity measurable in solids, taking Oxide of tJranium as unitj-, 
 is 1/200. See P. Curie, OBuvres, p. 375, p. 591 et 593: Mine. P. Curie. Ann. Ck. Fhys., Septembre, Oct. 
 Nov., 1903; Mmc. P. Curie, "Traile de Radioaciivite" (Gauthier-Villars'} : Mme. P. Curie, "Le Ra- 
 dium," 7, 1910, p. 65 a 70; and A. Laborde, "Methodes de mesure employees en Radioactivity." {Encyclo- 
 pedie Leaute, Gauthier-Villarfi. edit). 
 45552, Electroscope, Curie, complete for mineralogists, with reading microscope and discharging apparatus 
 with plate and accessories. 
 
 Duty Free 56.25 Duly Paid 67.50 
 
 45.554. Electroscope, Curie, as above but without the lower cylinder, base and plate D, for mounting specially 
 to suit the work intended. 
 
 Duty Free 33.00 
 
 45556. Electroscope, Curie, complete portable outfit in case. 
 
 Duty Free 50.00 
 
 45558, Discharging Cylinder of 3 liter^^ capacity, with nietailic 
 
 Duty Free 16.25 
 
 45560. Discharging Cylinder, as above, with removable cover. 
 
 Duty Free 17.50 
 
 45562. Discharging Cylinder, 450 cc capacity, with metal stoppe 
 
 Duty Free 12.50 
 
 4-5564. Black Oxide of Uranium (Us Oa) for use as a relative standard. In 10 gram vials. 
 
 Duty Free 0.40 Duty Paid 
 
 45566. Accessory for automaticallv stoppering above cylinders. 
 
 Duty Free " . . 3.7.5 Duty Paid 4.50 
 
 Duty Paid 39.60 
 
 Duty Paid 60.00 
 
 topper and support for the Electroscope. 
 Duty Paid 19.50 
 
 Duty Paid 21.00 
 
 and support for the Electroscope. 
 
 Duty Paid.. 
 
 0.50 
 
H O M 
 
 ELECTROSCOPE, CURIE icont i 
 
 l55(iS. Connecting Support 1 
 Duty Free, , , 
 
 Duty Paid 
 
 45570. Connecting Support U>v cvlindLMs, with automatic stopper. 
 
 Duty Free B.2.5 Duty Paid 7.50 
 
 45572. Dessicating Chamber. 
 
 Duty Free 6.25 
 
 45.574. Extension Rod, wjlli has'unet catch for removing the electrodes from cylinder. 
 Duty Free 50 Duty Paid 
 
 4557(i. Connecting Tube for l.iic two cylinders. 
 
 Duty Free 3.00 
 
 17S. Metallic tubular cooling device and boiler. 
 
 Duty Free 18.7 
 
 Duty Paid 7.50 
 
 60 
 
 Duty Paid 3.60 
 
 Duty Paid 22.50 
 
 ELECTROMETER, SCHMIDT, for both solid and li..r.l i.i i mccs, designed especially for the determination 
 of very small Radium quantities by the I'ln.ni i ■ i . ■ .Lod, the emanation of spring and other natural 
 waters by the so-called "shaking" metho.l, r.u i nr ploil,ing of decay curves and for the comparison of 
 the radio-activity of minerals and other solid.-^. Sec I'hynk. Zeiisckrifl Nr. IS, 1905, Phynik. Zeiisckrifi 
 Nr. 7, 1906, and Fortschritte der Medizin Nr. m, 1909. 
 
 455.S0. Electrometer, Laboratory Form, as above with shaking flask, blower, thermometer, connecting tubing, 
 stopwatch, rubber rod; frame for winding up wires and dish. 
 
 Duty Free 67.50 Duty Paid 90.00 
 
 45582. Electrometer, as above, portable form, with tripod, shaking flask, blo\Yei": thermometer, connecting 
 tubing, stopwatch, rubber rod, frame for winding up wires, and dish. 
 Duty Free 82.50 Duty Paid 110.00 
 
 4.5.584. Radium Standard Solution, a.s made in Prof. Schmidt's laboratory, in Curie flask. 
 
 Duty Free 7..50 Duty Paid 10.00 
 
 45586. Charging Rod, for I'^llectroscopes. The friction is produced between flannel a 
 lent to use and produces both positive and negative charges. 
 Duty Free 4.50 Stock 
 
 celluloid. Very conven- 
 6.00 
 
45590. 
 45592. 
 45594. 
 4559(5. 
 45598. 
 
 Electrometer, Dolezaiek Pattern, with long ;imbroid insuUitiou 
 being placed in a viTy convenient position on top of the 
 cleaning. The suspension is strong phosphor-bronze wit 
 in height and rotation of the vnne reliitivc to qnadrantR i 
 out altering relative im-!' !ini <■: \ .H'^ /ir .! .;:i.i.li '.^ii -. T'l 
 
 a wide range. Tlir i. ■ '■( |iii'> 'iili ■! .i ■ t, ■■ , , ,, ■ 
 
 students' work, tlic -i" ■ i' ■. i ■ I ■■ m ^ ■■ ■, ,i . . . ■ , i ■ .^m 
 difference of potenl i^il !■! ihh' \ <■ i (!■. i \\ .■.■n il ■■ ■ ii nli ■[ ii - 
 Duty Free 43.50 
 
 Extra Phosphor-Bronze Suspension, wiih hooks 
 Duty Free 75 
 
 li:irit.-; .iiid terminals, the latter 
 nil' :ii!il readily removable for 
 ' ' I . ■, I y. Ample adjustment 
 'l< ■ ■■> :i li zero adjustment with- 
 [ ;ii ■ ■_■ ■ !!■ :iri.iportionate over 
 
 ■ \r-' I ■ III- 'I- I III 1 1 Tit suitable for 
 
 .■III! II i '11 . ■ - ■ I lii I 'iM-Ler radius for a 
 ii- ^v.i.iiiMj ■■.LIT.. I tll;- d at 100 volts. 
 Duty Paid 63.80 
 
 Duty Paid . 
 
 1.10 
 
 Extra Vane, fiir above, with nlhfr plane or concave mirror, complete with suspension. 
 
 Duty Free 3.15 Duty Paid 4.65 
 
 Electrometer. Dolezaiek Pattern, same as No. 45588 but with a 50% higher sensitivity. 
 
 Duty Free 46.50 Duty Paid 68.20 
 
 Electrometer, Dolezaiek Pattern, same as No. 45588 but with silvered quartz fibre suspensions, increas- 
 ing Ihc sotisilivily aboiil 1009(-- Price on application. 
 Electroscope, Double-tilted Pattern, Bumstead. The two plates attached tn tho terminals arc charged 
 to cinial the op])osite |)otentials, usually 200 volts, and the gold lijf 1,'i'f \'r> f-jc.il :niil central 
 by meaiirt of levelling screws. The sensitiveness and stability an ■ ,. ,i' '■ ..ising or 
 
 lowering the leaf b\ i ■; ^i ■ -.i i !,■■ i r ■ ■ liustment 
 provided. This in-i i-iiii'i.ni 'u- :■ sensitivity 
 about three times that of the ordinary tiltell 
 form listed below for equal stability. The plates 
 are insulated with ambroid and an earthing ter- 
 minal is fitted into the case. The insulation of 
 the leaf is ambroid. Sec Ainrri'-nn Journal of 
 Sci('iir>\ December, 1911. 
 
 Duty Free 21.00 
 
 Duty Paid 30.80 
 
 45(i00. Electroscope, Rectangular Tilted Pattern, Wilson, 
 with ebonite insulation and ambroid insulation 
 to the leaf. C'omi)lctc on stand with levelling 
 screws. 
 
 Duty Free 12.00 
 
 Duty Paid 17.60 
 
 Electroscope, a.-^ ;ilio\-e, but with reading micro- 
 scojie will) fifty di;-isioTi scale in ocular. 
 
 Duty Free. ., 24.00 
 
 Duty Paid 35.20 
 
ARTHUR H. THOMAS COMPANY 
 
 ^^""Til 
 
 45654. 
 4565S. 
 
 45ti<i0. 
 45664. 
 
 Electroscope, Alpha Ray, Rutherford, consisting of aluminum about 4 inches cube, with optical glass 
 windows, removable gold leaf system, two circular tables, sulphur insulations, on cast iron base. 
 Designed for the accurate comparison of radio-activities measurable by the Alpha ray. With- 
 out Heading microscope. 
 Duty Free 20.75 Duty Paid 27.10 
 
 Electroscope, Alpha Ray, Rutherford, as above with Tele-Microscope with scale. 
 
 Duty Free 40.60 Duty Paid 52.90 
 
 Electroscope, Beta and Gamma Ray, Rutherford, consisting of an aluminum box with removable lid, 
 lined with lead throughout, lead slides at bottom and with thin aluminum window, with quartz 
 insulaliuns. Mounted on four legs, one of which is adjustable. When the instrument is used 
 for the ]in';isuremcnt of the Gamma ray only the aluminum aperture beneath the leaf is closed 
 by till' \(-di[ slide. Without reading microscope. 
 Duty Free 24.00 Duty Paid 31.25 
 
 Electroscope, Beta and Gamma Ray, Rutherford, as above, with Tele-Microscope with scale. 
 
 Duty Free 43.75 Duty Paid 57.00 
 
 Electroscope, Alpha, Beta and Gamma Ray, Rutherford, fitted with Tele-Microscope with scale in 
 eyepiece, jack and pinion table, upper box lined with lead on one side and with thin aluminum 
 plate on opposite side, with quartz insulations, etc. 
 Duly Free 69.30 Duty Paid 90.30 
 
 Electroscope, Emanation, Rutherford, of variable capacity for the measurement of emanations from 
 radio-active bodies and also t-f dcto'-t the presence of both Thorium and Actinium emanations. 
 If a stream of air conveying- 1 1 ■ -■-■ M' ;. under investigation is passed through the electroscope, 
 
 the variation in the rate of n i '■■■ i lie gold leaf when the current of air is stopped indicates 
 
 at once the nature of the cniMfM- mi in i Tit If the rate of movement increases with time, the 
 Radium emanation is present; if f II t half alue n 54 seconds, the Thorium emanation is 
 present; and if it practically disappears i the cou fa of seconds, the discharge is due to the 
 Actinium emanation. When it i«! re j red to determ ne the amount of Radium emanation in a 
 
 solution, the latter is boiled to dr 
 collected over hot water and intr ] 
 let in, and the pressure raised to I I 
 
 increases rapidly after the introd I 
 
 after about three hours, and then 111 1 
 
 ments of the rate of discharge are i le e th t 
 the emanation, or preferably three I s alter ts t 
 gold leaf (corrected (m- f]v.- n^itu 1 leal ) c 
 
 The electroscope is - ■ i ■ . ' 1 1 ! i ^. . | I m ans of i It 
 one-millionth of a m: h'. .... I I m Tl e Ra 1 u 
 
 flask and one niont ii .ii h r -i .ihug the amount of emanation reaches its equilibrium value. 
 Radium Solution is then boiled and the emanation transferred, as before, into the electroscope 
 and the rate of movement measured under definite conditions. In an apparatus of this kind the 
 emanation from 10-^ of a milligram of Radium gives a comparatively rapid rate of movement; 
 quantity cnnv-ymji.lii-.r: fn 10-' millitrrnm can easily be measured, while 10-^ milligram produces 
 
 1 the gases mixed with emanation are 
 
 II e\l au'^ted electroscope. Air is then 
 
 I ate of discharge of the electroscope 
 
 at on and reaches a maximum value 
 
 I IF 1 e period of 3.86 days. Measure- 
 
 leh te time after the introduction of 
 
 I ct o an 1 the rate of movement of the 
 
 f the aiiount of emanation introduced. 
 
 m stand rd Solution, containing about 
 
 n the form of solution is kept in a sealed 
 
 The 
 
 a detectabli 
 end and pm 
 
 to the upper ci'l -.1 i df , yi i- i-, ■, i i-uhi 
 
 natural leak, and so arranged as to I.. .|iii'r 
 beneath. Attached to above plug i- i i' 
 
 end reaching to within one or tw '.\ui. 
 
 attached the ^rol-l Irnf r--,-Fit.ri,i \v ir, n . , , 
 
 shown. Tilr' i|',|;, I ,■■ Ii I Ii ■, ■;' .■.,■ , ■ , I :,.-; 
 
 of which th(.' I.I ■ ■ !■■ 1 ■ i. ■.-: ■ VM 
 
 cular platc.-^. ■ ■■ i I . ■ li. ■ I in i in Ir- i - \\>\ 
 
 at right of illustrat inn. 
 
 Duty Free 34,65 
 
 Electroscope, Emanation. Rutherford, :i.-; ;d)tiv{\ w 
 Duty Free 54,45 
 
 ^ls of a cylindrical chamber of brass closed at either 
 (lies and having a capacity of about one liter. Fitted 
 I lied plug of special design, having an extremely small 
 ■' 1.1- lii. [igainst a high rate of exhaustion in the vessel 
 I ' 1 1 . 1 1 id of about one millimeter diameter the lower 
 I. I.I .'[ the bottom of cylinder; to the upper end is 
 \liiidiieLLl cover and viewed through the windows as 
 ! :iys is fitted with a variable capacity device by means 
 v\ (• or three times, this being effected by using two cir- 
 ipiirt and the other to the end of adjustable rod, shown 
 
 Duty Paid., 
 
 .'-^iicroflcope with f- 
 Duty Paid 
 
 45.15 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 457!t; 
 
 No. J5720 
 
 No. 45732 
 
 45700. Reading Glasses in nickel plated mount, with liiindle of ebonizeil wood. 
 
 Diameter of lens, inches 2 2^. 3 3^ 4 4i '> 5h 6 
 
 Focus, inches 5 7 S 10 13 13 14_ 15 
 
 Each 60 .80 1.00 1^0 2.00 2.25 2.50 3.00 3.50 
 
 45708. Receiver, Bruehl, for distillations in vacuum, with ground on lid, ground in stopper at top and one 
 gi'ound stopcock at side. With support for reagent glasses and with reagent glasses 8.00 
 
 45712. Receiver, Gautier, for distillations in vacuum, large model 4.00 
 
 45716. Receivers, of glass, plain. 
 
 Capacity, cc 500 1000 
 
 Each .25 .35 
 
 45720. Receivers, of glass, with tubulature. 
 
 Capacity, cc 100 250 500 1000 2000 
 
 Each 18 .24 .40 .45 .60 
 
 45724. Receivers, of glass, with tubulature anil ground in glass stopper. 
 
 Capacity, cc. 100 250 500 1000 _ 2000 
 
 Each 30 .40 .50 .60 .70 
 
 4.5728. Redactor, Jones, for the determination of phosphorous by a rapid method as described in Blair's ' 'Analy' 
 sis of Iron, 5th Edition, p. 93. Tube only, with glass stopcock 2.00 
 
 45732. Redactor, Jones, same as No. 45728 but with support, clamp, two flasks, glass stopcocks and rubber 
 tubing 6.00 
 
 45736. Redaction Tubes, of Hardest Bohemian Combustion Tubing, with one or more bulbs in center, as shown 
 in illustration. 
 
 Number of bulbs 1 2 3 
 
 Length, mm _300 350 400 
 
 Each .22 .30 .35 
 
 KEFKACTOMETERS. 
 
 REFRACTOMETERS, ZEISS. The use of the Refractometer in its various forms in the modern chemical lab- 
 oratory has increased with great rapidity. We recommend those who are not familiar with the 
 construction or use of these instruments to apply to us for the following literature published by the 
 firm of Carl Zeiss. 
 
 Mess 160. Oplical Measuring Instruments. Mess 292. 
 
 " 165. Dipping Refractometer. " 186. 
 
 " 172. Abbe Refractometer. 
 
 " 173. Butter Refractometer. " 189. 
 
 " 188. Pulfrich Refractometer. 
 
 " 245. Interferometer for Gas and Water, 
 and particularly for the list of refractometrica! literature, wliich 1 
 in this description, all of which are sent free of charge. 
 
 New Sugar Refractometer. 
 
 Use of the Abbe Refractometer in 
 
 the Sugar Indu.stry. 
 Dr. Wagner's Tables regarding the 
 
 Immersion Refractometer. 
 
 as become too extensive to refer to 
 
ARTHUR H. THOMAS COMPANY 
 
 45772. 
 
 ■15776. 
 
 45780. 
 45784. 
 
 Refractometer. Abbe, Zeiss, with Heatable Prism, I'or the deteririination of refraotive indices betweeu 
 nn=l.:j and nD= 1.7 in fluid, plastic and solid bodies. The refractive index is read directly from the 
 Sr;idLiai('d circle. This instrument has found wide application in tests as to purity, the deter- 
 mination of the proportion of known components in a mixture and in the analysis of food products, 
 particularly butter, cheese, margarine, cocoa fat, lard and other comestible fats; of salad oils, 
 cod-liver oil, lubricantSj alkalies, linseed oil, varnish, turpentine, petroleum, paraffin, ceresin 
 and other kinds of wax; glycerine, aniline; aqueous, alcoholic and ethereal solutions as, for in- 
 stance, the solution of ether and milk-fat adopted in Naumann's method of determining the per- 
 centage of fat in milk; milk serum; and for determining the quantity of albumen in blood serum 
 in clinical work. The Abbe Refractometer with heatable prisms may also be used for the pur- 
 poses for which the Butter Refractometer and the Milk Fat Reiractometer were originally intended 
 by use of the conversion tables furnished with each instrument and the two special thermometers 
 which are usually supplied only with the Butter and Milk Fat Refractometers. The accuracy 
 in measurement is to about two units of the fourth decimal place. Id case with Table of 
 DLspcngion and Conversion Tables, and stem thermometer divided in single degrees from 0-75° C. 
 Duly Free 100.90 Stock 137.30 
 
 Refractometer, Butter, Zeiss, for preliminarily testing butter refractometrically, also for investi- 
 gating fats, salad oils, etc. ; scope of the ocular scale from nn = 1.42 to nn=1.49; micrometer screw 
 for measuring the tenths of a division of the scale, accuracy in measurement one unit of the fourth 
 decimal. With a small flask of "standard fluid" for the revision of the adjustment of the ocular 
 scale, a table for converting the scale divisions into refractive indices. In case, with ordinary 
 thermometer in '^° from 0-50° C, with screw joint connection for attaching to the Refractometer. 
 Duty Free 50.90 Stock 69.30 
 
 Refractometer. Milk Fat, Zeiss. This Refractometer resembles externally the Butter Refractometer 
 and ill IimMi i nii--' i nction and manipulation is the same. The essential difference between the 
 two I (' . I ■ ■; lange, and in the case of the Milk Fat Refractometer is from ni.= 1.33 to n[,= 
 
 1.42. ■:'■ ■ ■ !■ '. ini'r Refractometer is from nD=1.42 to nu=1.49. The Milk Fat Refractometer 
 har> ;iii .1' i III .!( \ ill measurement to one unit of the fourth decimal. Complete in case, with table 
 for conversion of scale divisions into refractive indices and vice versa, and including correc- 
 tion thermometer to reduce the observations to 17.5° C. 
 
 Duty Free 53.8S Stock 73.27 
 
 Accessories for Above Refractometers. Du'y Free stock 
 
 Stem Thermometer, only, 0-75° C. in single degrees .90 1,80 
 
 AVoIlny Special Thermometer, with butter and lard scales, with screw 
 
 j<iint connection for attaching to the Refractometer 1.38 2,25 
 
 Baier Special Thermometer, with scales for summer butter, winter but- 
 ter and lard, with screw joint connection for attaching to Refractometer l.Sl 3. 65 
 Correction Thermometer, for milk fat investigations to reduce the obser- 
 vations to 17.5° C, with screw joint connection for attaching to Refrac- 
 tometer 1.38 2.25 
 
 Note— Unless otherwise specified the above Refractometers are always supplied with the stem ther- 
 mometer, as above listed. 
 
ARTHUR H THOMAS COMPANY 
 
 45800. 
 
 45804. 
 
 45808. 
 45809. 
 
 45S10. 
 45811. 
 
 Refractometer, Dipping, ZeisK, for Investigatins^ Fluids of Low Refractive Index, ewpecialiy dilutions, 
 alcoholic, volatile solutions, etc.; scope of the ocuUr acalo from Ud = 1.31^5 to nB = l-"367 with an 
 accuracy in measurement to one-third unit of the fourth decimal. In above illustration the 
 refractometer hangs on the wire frame with its lower end, the prism, immersed in one of the 
 glass beakers filled with the solution to be tested, the beakers being surrounded by flowing 
 water at the required temperature. A rectangular mirror below the trough reflects the light from 
 below through a glass plate into one of the rows of glass beakers. Because of its accuracy and 
 extremely simple operation, the Dipping Refractometer has become an indispensable instru- 
 ment in the examination of various products as to their purity, analysis of standard solu- 
 tions, and to the rapid and very exact determination of the concentration of solutions. Dr. B. 
 Wagner's tables of various substances which have been investigated by means of the Dipping 
 Refractometer are recommended for use in connection with it (Prii'^- S,-i 00). ( 'omplete in case, 
 with free standing refractometer prism of acid-proof glass, with .i!i i v M 'M.iker for the in- 
 vestigation of quickly evaporating solutions and with a table t'oi I ■ i -ion of the scale 
 readings into refractive indices, but without Auxiliary Prism, he:ii n g ■ i "ig!] "V thermometer. 
 
 Duty Free 62.50 Stock 85.00 
 
 Accessories for the Dipping Refractometer. 
 Auxiliary Prism for investigating fluids in very small quantities, for 
 deeply colored solutions, such as molasses, dark beers, etc., and for the 
 determination of albumen in blood serum. With unpolished surface of 
 
 contai't .slightly countersunk 
 
 Heating Trough, as shown in illustration of No. 4578S, for the recep- 
 tion of 12 glass beakers, each containing 20 cc, for investigations in 
 bulk, with a glass plate at the bottom of the trough and mirror below, 
 
 and with 24 beakers 
 
 Thermometer, 15-25° C. divided in ^ths, in metal case, with certifi- 
 cate of accuracy 
 
 Stem Thermometer, 15-25" C, divided in |ths, about S cm long, with a 
 red line at 17.5° C 
 
 Tempering Bath, for use without a continuous flow of water, recommended when the Refractometer 
 is only used occasionally and for investigations at indoor temperatures. The construction of this 
 hath is based on the fact that a large volume of water with a comparatively small surface area 
 is very slow in acquiring the temperature of the surrounding space. The outfit consists of the 
 following: — 
 
 Enamelled Pan, of about 10 liters capacity, with felt jacket and over- 
 flow joint, 1 meter of rubber tubing and stopcock 
 
 Filler, for uniformly introducing fresh water into the pan without stir- 
 ring, with funnel 
 
 Carrier fL) for Refractometer, with mirror 
 
 Umbrella Frame, for 12 beakers of 20 cc capacity; and with 24 beakers 
 
 Duly Free 
 3.00 
 
 7.50 
 
 4.25 
 
 .56 
 
 Duly Free 
 
 3.88 
 
 1.25 
 6.06 
 6.63 
 
 Slock 
 4.08 
 
 10.20 
 
 6.12 
 .81 
 
 Slock 
 5.58 
 
 1.70 
 
 9.01 
 
REFRACTOMETER, SUGAR, ZEISS, a new and special adoption of the Abbe Refractometer tor the sugar in- 
 dustry. The wide adoption of the refractometric method of determining dry solids in sugar factory 
 products h;is resulted in a simpler model of the Abbe Refractometer (heretofore widely used in the 
 
 sugar industr^Oi 
 the International T'd 
 in the prism which is : 
 than the prism usetl i 
 tion quotient. Tin ■ 
 telescope and is di^ I' 
 With this new ins;l i '.i 
 dilution. The inslnn 
 trirp, h adju 
 
 irted witli the ro6ppr:ition of the Physikalisch-Technische Reichsanstalt and 
 in I'm- rnifonii .Mr-thod-. nf Sugar Analysis. A distinct improvement is 
 ' ill HI Ml- piisiii ni.nk- (if ii^lil it flint glass and which gives a more open scale 
 111"' l;cfr:ict(>]iM|ir ;uid w hirh noticeably reduces the error in the refrac- 
 ;]- [iri'ctly in percentages of dry substance and is now in the field of the 
 ' .")i ) for whole percents and from 50-85 for half percents of dry substances. 
 I.irkest ordinary molasses may be accurately tested directly, without 
 :LLl.|usted regularly for 20° G. but, when intended for use in tropical coun- 
 tlic temperature of adjustment being engraved on each instrument. 
 45812. Refraclometer, Sugar, Standard Model, as above, adjusted for 20° C, with special thermometer from 
 to 511 ill A' with screw mounting. 
 
 Duty Free' 75.90 Stock 103.22 
 
 45816. Refractometer. Sugar, Tropical Model, adjusted for 28" C, with special thermometer as above. 
 
 Duty Free 75.90 Stock 103.22 
 
 45820. Thermometer, only, to 50°C in 1°, with screw mounting. 
 
 Duty Free 90 Stock 1.30 
 
 45824. Thermometer, only, as above, with fixed metal case. 
 
 Duty Free 1.25 Stock 1.80 
 
 45828. Refractometer. Pulfrich, Zeiss, designed for measurements of refraction (nc) and dispersion (differ- 
 ence of indices for the Fraunhofer lines C D. F and G^) of transparent, fluid and solid bodies, 
 either single or double refracting; investigations of fluids at high temperatures, including bodies 
 that are fluid only under such conditions; and the determination of the differences of refractive 
 or dispersive power of such solid or fluid substances as differ but little in their optical proper- 
 ties. (The instrument is then used as a differential refractometer.) In the construction of the 
 accessories which serve for the purposes mentioned above, special attention has been given to 
 securing simplicity in the methods of observing and in the subsequent computations. All parts 
 of the apparatus are, therefore, permanently fixed in position after being once properly adjusted, 
 and hence are always ready for use. The computations for dispersion and other differentia! 
 quantities from the data given by the observation are made by means of suitable tables in the 
 same manner as hitherto for n^ without the use of logarithms. In regard to accuracy the appa- 
 ratus is designed to meet the requirements which are usual in spectrometric measurements, 
 i.e., exactness to a single unit of the fourth decimal place in the refractive index and to one or two 
 units of the fifth decimal place in the dispersion and other quantities depending upon differen- 
 tial measurements. With Geissler tube, cabinet for the instrument and case for the prisms and 
 accessories, and detailed directions for use, but without prisms or heat- Duty Free Du;7 Paid 
 
 ing apparatus - 118.75 161.50 
 
 Accessories for Pulfrich Refractometer. 
 
 45832. Geissler Tube, with H-filling 
 
 45836. Prism I (n£,= 1.62), for the determination of fluids having refractive 
 
 indices varying from that of water no = 1.33 to n^^ 1.61; including mount, 
 
 carrier and cemented glass cell 
 
 45840. Prism II (nB=1.75) for the examination of solid substances (glasses, 
 etc) having refractive indices varying from nD=I.47 to ni, = 1.74; in- 
 cluding mount and carrier 
 
 2.00 
 
 12.50 
 
 14.25 
 
 IS.OO 
 
 19.44 
 
45844. Barium Mercuric Iodide .sululiuJi (ni,= 1.7S) s|juuitit: ^ravU.y = o.G, al»>>iit :i5 Duly Free Duty Paid 
 
 grams .63 .90 
 
 45848. Prism III, for substances of exceptionally high refractive power, having refrac- 
 tive indices varying from nD = 1.64 to np=1.88; including mount and 
 
 carrier 17 ..50 25.20 
 
 45852. Tube, 5 mm inside diameter, for the investigation of very small quantities of 
 
 fluid 1.25 1.80 
 
 45856. Prism IV (no=1.62) for the differential examination of fluids, witii mount, 
 
 carrier and cover 18.00 25,92 
 
 45860. Prism V (nu=1.75) for the differential examination of fluids, with niouni, 
 
 carrier and cover 22.00 31.68 
 
 45864. Heating Apparatus 13.75 18.70 
 
 45868. Thermometer, from to 75° C, in single degrees, with screw foi' fitting into the 
 
 heating apparatus .00 1.30 
 
 45872. Thermometer, 0-50° C, divided in -^ths, with screw 4.00 5.76 
 
 45876. " 50-100° C, divided in i^ths, with screw 5.00 7.20 
 
 45880. Sodium Burner 3.63 4.93 
 
 45884. Fluid Cell, with piano-parallel bottom (no^ 1.65), glass stopper and thermomc- 
 Irr fur the investigation of fluids on a prism, on which a glass tube is not 
 
 cemented 4.50 *!.48 
 
 45886. Glass Dish, for cementing the glass cells 1.25 1.80 
 
 45888. Capped Bottle, with glass rod for the application of drops .25 .36 
 
 45890. Monobromide of Naphthalene (no=1.65), as an immersion fluid for the inves- 
 tigations of glasses, etc., about 10 grams .13 .18 
 
 45892. Potassium Mercuric Iodide, solution, (ni, = 1.72j, specific gravity = 3.1, about 
 
 35 grams .50 .72 
 
 45894. Refractometer, Pulfrich, Zeiss, with complete outfit, .suitable for ordinary physical and chemical in- 
 vestifjations as follows:— 
 
 Pulfrich Refractometer, 1 extra Geissler Tube, Prisms I, II and IV; Heating Apparatus, Ther- 
 mometer 0-75°C. in single degrees, Thermometer 0-50°C,, in i^ths; Thermometer 50-100°C., in 
 TTiths; Spiral Heater. Water Pressure Regulator, 2 Capped Bottles, with glass rods; 1 bottle of 
 >Ionnbrnmide of Xaphthalcnc, Glass Dish, Sodium Burner. 
 Duly Free 212.90 Duty Paid 289.54 
 
 J5l [Si 
 
 45908. 
 4.5912. 
 4.5916. 
 
 Hot Water Heater with Water Pressure Regulator for 
 
 use with any Zeiss Refractomcters. The Dipping 
 Refractometer as shown in No. 45788 with heating 
 trough may, in many investigations, be used with- 
 out a Spiral Heater and Water Pressure Regulator, it 
 being sufficient to allow the water at the temperature 
 of the room to flow slowly through the heating trough 
 from a tank suspended up on the wall. Where it is 
 necessary to maintain a given temperature for hours 
 at a time to within a few tenths of a degree as, for 
 instance, in Dr. Ackermann's rapid method for the 
 estimation of alcohol and extract in beers, either a 
 Tempering Bath No. 45808 or the Spiral Heater and 
 Water Pressure Regulator must be used. 
 Spiral Heater, with support and Duty Free DmyPaid 
 
 Bunsen burner 15.25 20.74 
 
 Cistern A, of Water Pressure 
 
 Regulator 1.75 2.52 
 
 Cistern B, of Water Pressure 
 
 Regulator 1.25 1.80 
 
 Note^ — Where the Water Pressure Regulator is to be 
 used with an Abbe or Pulfrich Refractometer, 
 the complete Water Pressure Regulator with 
 Cisterns A and B is required. 
 
Percent Sugar Table According to Refraction Indices with the Sugar Refractometer, 
 
 Rerraction 
 
 Schi>nrock 
 
 5% 
 
 Main 
 
 5.2% 
 
 Tolman and Smith Prinsen-Geerligs 
 
 5.07„ 5.0% 
 
 Hubener 
 
 1,3403 
 
 5.1% 
 
 1,3479 
 
 10 
 
 10.2 
 
 10.1 
 
 10.1 
 
 10.0 
 
 1,3557 
 
 15 
 
 15.2 
 
 15.1 
 
 1.5.1 
 
 15.0 
 
 1,3639 
 
 20 
 
 20.1 
 
 20.1 
 
 20.2 
 
 20.0 
 
 1,3723 
 
 25 
 
 25.1 
 
 25.1 
 
 25.1 
 
 
 1,3811 
 
 30 
 
 30.0 
 
 30.1 
 
 30.0 
 
 
 1,3902 
 
 35 
 
 35.0 
 
 35.0 
 
 35.0 
 
 
 1,3997 
 
 40 
 
 40.0 
 
 40.0 
 
 40.1 
 
 
 1,4096 
 
 45 
 
 45.0 
 
 45.0 
 
 45.0 
 
 
 1,4200 
 
 50 
 
 50.0 
 
 50.0 
 
 60.0 
 
 
 1,4307 
 
 55 
 
 55.1 
 
 .55.0 
 
 54.9 
 
 
 1,4418 
 
 CO 
 
 60.0 
 
 60.0 
 
 59.9 
 
 
 1,4532 
 
 05 
 
 64.9 
 
 64.9 
 
 65.0 
 
 
 1,4651 
 
 
 75 
 
 69.9 
 
 69.S 
 
 
 1,4774 
 
 
 70 
 
 74.9 
 
 74.7 
 
 
 1,4901 
 
 
 SO 
 
 79.9 
 
 79.9 
 
 
 1,5033 
 
 
 85 
 
 .S5.0 
 
 84.9 
 
 
 The first column in the above table shows the refraction quotient for sodium light in air at 20° C and the 
 second the corresponding sugar percents, i.e., the number of grams of sugar in 100 grams of pure sugar 
 solution, calculated according to Schonrock. The remaining columns give the sugar percents for the 
 corresponding refractive indices of the first column according to the calculations of Main, Tolman 
 and Smith, Prinsen-Geerligs and Hubener, the value of Prinsen-Geerligs being transposed from 28" to 
 20° C. The variations in these tables (the first having been determined in Charlottenburg, the second 
 in London, the third in Washington, the fourth in Java and the last in Halle) are within the limits of 
 error permitted by the sugar trade. 
 
 DR. EMIL REISS' TABLE 
 
 for direct caiculallon of the Scale Divisions, percentage of Aibu 
 Refractometer, 
 
 As this table is in frequent demand in Clinical Laboratories, but is otherwise 
 we are enabled, by the author's kind permission, to reproduce it in full. 
 
 t 17.5° C. with the Dipping, 
 
 hat difficult of access 
 
 Refractive 
 
 Indices 
 
 correepondlng 
 
 1.33590 
 1.33628 
 1.3.3667 
 1.33705 
 1,33896 
 1 ,34086 
 1.34275 
 1.34463 
 1.34650 
 1.34S36 
 1.35021 
 1.35205 
 1.35388 
 
 Blood Serum 
 
 nn for Diat. Water 
 
 A nn for Non-albumlnoua n 
 
 A no for 1% Alhumen 
 
 1,33320 
 0,00277 
 0.00172 
 
 )xudatloDS and Ext 
 
 no for Dlst. water 1,33320 
 
 A nn for Non-albumlnous matter 0.002H 
 
 A no for 1% Albumen 
 
 35 
 
 2.84 
 
 40 
 
 3.94 
 
 45 
 
 5.03 
 
 50 
 
 6.12 
 
 55 
 
 7.20 
 
 60 
 
 8.28 
 
 65 
 
 9.35 
 
 70 
 
 10.41 
 
 - 0.220 
 
 - 0.220 
 
 - 0.220 
 -0,218 
 
 - 0.218 
 -0.216 
 -0.216 
 
 - 0.214 
 -0.212 
 
 Percentage 
 
 Dlff. of Albumen 
 
 Albumen 
 
 Scale for 1 Dlv. 
 
 0-14 
 
 
 — _ 
 
 -0.210 
 
 0.35 
 
 
 
 
 - 0.210 
 
 0.56 
 
 
 _ _- 
 
 - 0.210 
 
 0.77 
 
 
 
 
 - 0.206 
 
 1.80 
 
 
 — — 
 
 - 0.206 
 
 2.83 
 
 
 
 
 - 0.206 
 
 3.86 
 
 
 — — 
 
 - 0.206 
 
 4.89 
 
 
 — — 
 
 - 0.202 
 
 5.90 
 
 
 — — 
 
 - 0.202 
 
 6.91 
 
 
 — — 
 
 - 0.202 
 
 7.92 
 
 
 — — 
 
 - 0.200 
 
 S.92 
 
 
 
 
 -0.198 
 
AffJ^I i=|=f| 
 
 No. '(5929 
 LaboraloTT Intcrfernmeler fabout ,'-, Full siwl. Kl = C"llima((.r. /„ C" 
 
 id Ciis Chamber'). F and OA' = Reading Teleacnpe. 
 
 REFRACTOMETER (GAS ANO WATER INTERFEROMETER) ZEISS. i\ nvw in^inuwnt for tlie optical 
 analysis of gas and water developed at the Zeiss works in cooperation with Prof. Haber. of Berlin, conyi.stiag 
 of a modification of Ivord Hayleigh's type of apparatus wherein readings are takon by means of a system of op- 
 tical compensation instead of by a pressure gaiij^e, affording a much more r.'pi'l :ni'l (■--■p/ciifnt means of work- 
 ing and which improvement permits the construction of the inHtrnim ..i i ;■ ; i! ■ lUirn. The Gas 
 Refractometer is made in two ranges of accuracy, the first known as tin I . .1 m i ..r . I i. < i li lometer reading 
 the per cent of COi to within l/SO^ to 1/100%, and the Portableform rc.aH)iij I. . >'._ti,;ii -,' , i- ',' , of CO*. 
 
 Purposes for which the Gas Interferometer is available. 
 
 The Clas Interferometers serve for ascertaining the difference between the refractive indices of a given gaa 
 and a standard gas. The method of optical analysis is directly applicable to ail binary mixtures of gases, i.e., ail 
 mixtures of two gases, which includes all commercially pure gases, such as oxygen, nitrogen, hydrogen, carbon 
 dioxide, etc., provided the given gas is contaminated by only one other gas which is known from the nature of the 
 process of manufacture. In this connection binary mixtures of gases may also take the form of a primary mix- 
 ture of unvarying composition and a quantitatively vnriable component, i.e., normal air containing an admixture 
 of a gas, such as carbon dioxide, chlorine, or acetylene; and, where the initial fuel was known, also Hue gases which 
 do not contain carbon monoxide may be regarded as binary mixtures of theoretical flue gas and an excess of air. 
 
 Finally, the method applies to all mixtures from which one or more components can be easily removed by 
 quantitative absorption. A case in point is that of fliie gases containing carbon monoxide. To determine the per- 
 centage of carbon dioxide in a mixture of this kind one of the gas chambers may be filled with dried flue gas, the 
 other with dried flue gas freed of its COj, when the reading will give the proportion of C'Oi present in the mixture. 
 Similar cases arise in the examination of gaseous products occurring in the intermediate stages of chemical proc- 
 esses of manufacture. 
 
 The Gas Interferometers are now being used for the technical as well as scientific analysis of gases in con- 
 nection with a great variety of experimental investigations carried on in laboratories attached to mines, experi- 
 mental borings, chemical works manufacturing commercially pure compressed gases and others having to control 
 the composition of gases occurring as intermediate products, public health ofBces and medical institutes for the 
 systematic analysis of air, steam users' associations, and institutions devoted to researches in physics and physical 
 chemistry. We shall be please<l to provide further information and suggestions respecting the application of the 
 apparatus. 
 
 3-^^lii 
 
 EE 
 
 DiagrammBtic View (Fig. 3; Elevation; Fig. 4; Plan) of (he Laboratory Interferometer. The parallel pon 
 from the collimator Kl sphts up, the upper half passing over the gas chamber (Fig. 3) and through the auxilliary |.. 
 PI. next through the double slit (Fig. 4) into the telescope F. whilst the lower half passes partly through the gas eh n 
 the air chamber L, thence under H, through the compensator plates Pg and Fl respectively, and through the douli! 
 The resulting diffraction spectra are seen in the eyeplei-e 01.. The micromeler screw with it^ drum Tr serves for tun 
 PI, whereas Pg is stat' 
 
 . I hrough 
 
■f 
 
 Applications of the Water Interferometer 
 
 The Water InterferomcUir is susceptible of a degree of accuracy which is 5 to 50 times greater than that of the 
 Dipping Refractonieter anil is primarily intended for the rapid testing of natural waters. In the ease of river 
 water it serves for ascertaining the proportion of salts which enter rivers with the waste waters discharged by 
 manufacturing establishments and which under local regulations are not allowed to exceed a certain percentage. 
 The Interferometer furnishes a convenient means of ascertaining the course of flowing subsoil water from the 
 analys f the '^ampleb 
 
 "It rotl nstance of its utility, a convenient means of continuously con- 
 
 II 1 II or storage basins. Water contained in engine boilers can be 
 
 I t to the whole of the salts present in solution. 
 
 graphic purposes, demands a degree of accuracy which can 
 II 1 bv titration immediately after the sample has been obtained, 
 
 \\ t 1 rt n ptp 1 Tb f om the outset been so designed as to be available for use on 
 rt t r 1 I r f rr he readings which are quite as exact as those obtainable by the 
 h le 1 p 1 ^\ tl tb longest water chamber it ran be applied for minute investigations 
 
 such as hitherto tould not be thought of. Moreover, owing to the high degree of accuracy of whieh the Water 
 Interferometer is capable very sparingly soluble substances have now been made to yield to the refractometric 
 method of analysis, i. e., alkaloids, minerals, colloids, and other extremely dilute solutions, which previously 
 could only be dealt with physically by measuring their electric conductivity. 
 
 The Water Interferometer is, in fact, a convenient and accurate water analyzer and as such admirably adapted 
 for the permanent control of drinking water, river water, and the waste waters discharged by factories, and should 
 prove valuable to water boards, public analysts, and others whose duty it is to test water systematically; for use 
 in oceanographic laboratories and in connection with marine expeditions, and last but not least, for the equip- 
 ment of laboratories appointed for researches in physics, physical chemistry, and mineralogical chemistry. 
 
 For more complete description write for a copy of Zeiss Mikro 245 and see the following references, copies 
 of which can be mostly sent on application. 
 
 The trumei 
 trolling tl w ter f [ 
 tested th ] t 
 
 Tl n 1 t 
 
 only be at t ne 1 ti 
 that is nboarl 11 
 board, ani ■^\ th a 1 
 metho 1 f t ti 
 
 r angeto. Ckemie, 19. p. 1717. 
 
 S. F. Haber, Zdlschrift far Elektrochemie, 13. p. 460, 
 
 1907. 
 3. L. Sluckert, Zeitschrift fiir Eleclrochemie, 16, p. S?, 
 
 1910. 
 Bulletin A^o. 4S. U. S. Bureau of Mines, 
 a Interferometer (original arrangement). 
 
 Lord Rayleigh, Proc. Royal Soc, 69. p. iOi, 1898; p. 97. 
 
 C- G. Gerrits. Thesis. Amsterdam, 190!,. 
 Dr. Trovers' book Study of Gases 1901 published by Messrs. 
 Macmillan and Co.. St. Martina Street Leicester 
 
 Rayleigh's Labor 
 
 '. Hill. 
 
 ■new type), 
 
 - EhklrocheiTiie. 16. p. ST. (i 
 ■ /•.rhriftfar angew. Chemie. 
 
 2S. 
 
 Ramsay u /id Travers, Proc. Royal Soc. 
 
 64. p. 190, 1899, and 67, p. 331. 1900. 
 E. A. J. Cunaeus, Zeitschrift fur pkys^ 
 
 p. 232, 1902. 
 
 eS, p. 2S5, I 
 
 Portable In(erf«rome(ers for eas and water. 
 
 F. Lowe. Fknsikahsche Zeitschrift, 11. p. 1047, 1910. 
 
 F. LSwe, Zeitschrift fur Instrumentenkunde, SO, p. Stl, 
 
 1910. 
 L. t'on KUmperer, Chemik-er-Zlg. 35. p. 557. 1911. 
 
 459G4 la Identical in appear- 
 ance with Portable Gas Tn- 
 Icrferometer No. 45948 
 
 -< Inlerfcrumeter with hood 
 
 No. 453JS— PorUtili, 
 
 ■• IntirferomLler nithout hood 
 
 ■15920. Laboratory Interferometer, Zeiss, with standard 10 cm wide, 20 cm hi^h ^nd 200 cm long. The gaa to 
 be examined and the standard gaa are each contained in a chamber 100 cm long with a cross section 
 
 of 1 sq. cm, m.'iking the capacity of each chamber 100 cc. In s _ 
 cm tin- [ituit of r I lor is similar to that obtainable by the exact raetli 
 tact niili (ufinirv. Thus the percentage of carbon dioxide (C< > ■ 
 can he ;i -;i crhiiiii'd with a degree of accuracy within 0.01 to ' 
 rharriliiT 100 <'iii hin;; and cover, but without lamp. 
 Duty Free 12.5.00 Stock 
 
 n-^thof 100 
 in con- 
 P CH.) 
 iile gas 
 
 . 170.00 
 
45932. 
 45936. 
 45940. 
 45944. 
 45948. 
 
 45952. 
 45956. 
 45960. 
 45964. 
 
 45968. 
 45972. 
 45976. 
 
 Iluly Free 
 
 suck 
 
 15.00 
 
 20.40 
 
 6.25 
 
 8.50 
 
 2.63 
 
 3.57 
 
 8.75 
 
 11.90 
 
 1.13 
 
 i.i;3 
 
 4.00 
 
 5.44 
 
 Accessories for Laboratory Interferometer. 
 Nernst Lamp for a eurrent of 100 volts, with extra burner, in fitting 
 mounted on socket pin, with condenser, cable and plug switch for 
 
 attachment to ordinary lamp fitting 
 
 Osram Lamp, 3.5 volts, with tittinp.s and condenser, mounted on socket 
 
 pin 
 
 Six additional Osram Lamps, only, without mounting 
 
 Accumulator, 4 volt, in wooden case, with switch and cable 
 
 Four-way Cock 
 
 Packing Case 
 
 Portable Gas Interferometer, Zeiss, consisting of :iii i)(i:Il;I.i i\''ii,ili ii-i' |n.M.' 
 eter and 50 cm long, the only part which it:<ii i. i L - I i ..-i n I ■■ in.' .i -imII 
 chambers 10 cm long it reads percentages n i i j . , ■ 1 1 i i i I l 
 0.2%. The weight of the portable pattern I-. ;il, Mill ii |(,^. Wnhiuhr 
 10 cm long and detachable protecting cover, nicluding condenscT and hu 
 Osram lamp on condenser. 
 
 Duty Free 137.50 Stock 
 
 Accessories for the Portable Gas Interferometer. 
 
 Interchangeable Gas Chambers, 2 or 5 cm long 
 
 Six additional Osram Lamps, only 
 
 Accumulator, 4 volt, iu wooden box. with switch .■unl rahle 
 
 Water Interferometer, Zeiss, of exactly the samo 'i')'. i--...,.. ■l^ the Portable Cla.'s Interferometer. In 
 
 regard to accuracy it surpasses all Refracinr In h have so far been in use for practical 
 
 purposes and for ambulant research worl. in. w-\rr chambers are interchangeable and, 
 according to their length, read the jiroponion ni s:iit contained in a solution of NaCl, for 
 instance, accurately within 0.03 to 0.003 per mille, and hence the instrument gives far more 
 accurate results than the best readings obtainable with the pycnometer or by the methods of 
 volumetric analysis. With an interchangeable water chamber \, 1, 2 or 4 em long and remov- 
 able cover, including condenser and lamp fittings with 3.5 volt Osram lamp on condenser. 
 
 Duty Free 156.25 Stock 212.50 
 
 Accessories for Water Interferometer. Duly Free Stock 
 
 Additional Water Chambers, each 18.75 25.50 
 
 Six Additional Osram Lamps, only 2.63 3.57 
 
 Accumulator, 4 volt, in wooden box, with switch and cable S.75 11.90 
 
 / .iliout 10 cm diam- 
 
 ■ liator. With gas 
 
 ■ 1,1 ■L.-'y within 0.1 to 
 M^i:ible gas chamber 
 hliings with 3.5 volt 
 
 187.00 
 
 Duty Free Slock 
 
 13.75 18.70 
 
 2.63 3.57 
 
 11.90 
 
 8.75 
 
 Refractometer, Fery, Hiiger, a direct reading refractometer for taking the refractive index for sodium 
 light of oils, solutions of acids, mixtures of glycerine, alcohols, etc., with water, sugar solutions, 
 and other liquids of interest to the industrial chemist. This instrument possesses the following 
 advantages: — 
 
 It reads direct the refractive index of ai 
 The glass with which the liquid come: 
 
 chemical reagents. 
 The temperature control is e.itremeiy s 
 The manipulation of the apparatus is et 
 
 Duty Free 
 
 t liquid with a 
 
 ind effective and Torn 
 
 ■ the action of 
 
 legral part of the apparatus. 
 
 Duty Paid 218.50 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 46004. 
 46008. 
 
 46012. 
 46016. 
 46020. 
 46024. 
 46028. 
 460.52. 
 46036. 
 46040. 
 
 46044. 
 46048. 
 
 -r,m 
 
 1000 
 
 2000 
 
 3.2.5 
 
 3.75 
 
 4.00 
 
 lo^So 
 
 3 
 I3..50 
 
 5 
 24.00 
 
 2.50 
 
 .500 
 
 1000 
 
 .20 
 
 .25 
 
 .35 
 
 Respirator, Automatic, for protection of throat and lungs in laboratories, factories, miiiL'5 etc , uliere 
 
 the atmosphere, is filled with dust and poisonous gases 2 00 
 
 Respirator, Automatic, of aluminum with pneumatic cushion which fits any face closely but without 
 
 discomfort 2 50 
 
 Retorts, Copper, for making oxygen; of heavy polished copper with iron clamp and brisg deli\ery 
 
 tube fitting with ground joint, diameter of tube 12 mm. 
 
 Capacity, cc 250 
 
 Each 3.00 
 
 Retorts, Heavy Copper, tin lined, as used in distilling apparatus No. 26548 
 
 Capacity, gallons § 1 
 
 Each 7.00 8^00 
 
 Retorts, Best Bohemian Glass, plain. 
 
 Capacity, cc 25 50 75 150 
 
 Each 10 .13 .14 .18 
 
 Retorts, Best Bohemian Glass, with tubulature but without glass stopper. 
 
 Capacity, cc 50 __ 75 150 
 
 Each 16 .18 .22 
 
 Retorts, Best Bohemian Glass, with ground glass stopper. 
 
 Capacity, cc 25 50 75 150 
 
 Each 17^ .19 .21 .2(i 
 
 Retorts, Jena Glass, plain. 
 
 Capacity, cc 50 100 250 
 
 Each .11 .15 .21 
 
 Retorts, Jena Glass, with tubulature but without glass stopper. 
 
 Caiiacity. cc 50 10 250 
 
 Each .19 " .21 .32 
 
 Retorts, Jena Glass, with tubulature and glass stopper. 
 
 Capacity, cc 50 100 250 500 1000 2000 3000 4000 
 
 Each 
 
 500 
 
 1000 
 
 2,50 
 
 .500 
 
 1000 
 
 .30 
 
 .45 
 
 .55 
 
 500 
 
 1000 
 
 2000 
 
 .34 
 
 .45 
 
 .68 
 
 2000 4000 8000 
 
 500_ 
 .50 
 
 1000 
 .63" 
 
 2,50 
 
 2000 
 .95 
 
 8000 10000 15000 
 
 1.95 3. .50 4.35 6.55 
 
 .75 
 
 J.30 
 
 1.70 
 
 3000 
 
 4000 
 
 8000 
 
 .93 
 
 1.00 
 
 2.10 
 
 3000 
 
 4000 
 1.45 
 
 8000 
 
 1.30 
 
 2.90 
 
 40 .42 .55 .80 1.00 1.35 1.73 
 
 Rotorts, Royal Berlin Porcelain, with tubulature and ground in stopper. 
 
 Capacity, cc 40 140 
 
 Each 1.95 2.85 
 
 Retort, Royal Berlin Porcelain, with removable top, 470 cc capacity 3.60 
 
 Retort, Infusible Bohemian Glass, with two bulbs, as used for making oxygen. 
 
 Capacity, cc 100 260 
 
 Each 45 .55 
 
ARTHUR H. THOMAS COMPANY 
 
 46092. 
 46096. 
 
 ground into cover. 
 
 i unij 
 
 >.50 
 
 3.00 
 
 4 
 5} 
 
 6 
 6» 
 
 .SO 
 
 1.00 
 
 115 
 
 156 
 
 2000 
 4.50 
 
 Retorts, Iron, 1 ii il 
 
 delivery tube 
 
 Capacity, ec 250 
 
 Each "2725 
 
 Rings, Concentric, Copper tinned inside, for water baths, etc., with cover. 
 
 Number in set 3 
 
 Outside diameter of set, inches 4, 
 
 Per set ~M 
 
 Rings, Concentric, Royal Berlin Porcelain. 
 
 Number in set 3 4 o 7 9 
 
 Outside diameter of set, inm 74 _ 9^ 115 1 5G 197 
 
 Per set 80 " ' 1.20 1.65 2.70 4.05 
 
 Rings, Concentric, of japanned cast iron, with screw clamp on largest ring for attaching to upright 
 
 support) outside diameter of largest ring 8 inches, with four rings in set.^ Per set 75 
 
 Rings, Support, of japanned cast iron, with screw clamp with brass screw. Distance from center of 
 
 support to center of rings 2f inches. Suitable for use on upright supports with tripnd base and 
 
 supports with rectangular base in the smaller sizes. When used on the same support rings will 
 
 be concentric. Outside diameter, inches ^4 3? 
 
 .15 
 
 .17 
 
 3f 
 .12 
 
 60 
 .45 
 
 60 
 
 When 
 
 B^ 
 
 Each 
 
 Rings, Support, similar to above but with distance from center of support to center of ri 
 
 inches. Suitable for use on supports with rectangular base in the three larger sizes. 
 
 used on the same support rings are concentric. 
 
 Outside diameter, inches -I 3f 4; u\ 
 
 Each 15 .17 .20 .25 
 
 Rings, Support, of japanned iron, with straight extension bar 8 inches long. Distance from end of 
 
 shank to center of rings 9^ inches. A clamp holder such as No. 24518 is necessary when these 
 
 rings are to be attached to an upright support. 
 
 Outside diameter, inches 2^ 
 
 Each 10 
 
 Rings, Support, of brass with glazed porcelain inset, with screw clamp. 
 
 Outside diameter, mm 
 
 Each 
 
 Rings, Support, of brass, with wooden inset, with screw clamp. 
 
 Outside diameter, mm 
 
 Each 
 
 Roasting Dishes, Battersea. 
 
 Diameter, inches _ 3 
 
 Per dozen 80 
 
 Rubber Bands, of pure gum, in boxes of seven assorted sizes. Per box 1.00 
 
 Rubber Bulb, of pure, acid-cured red rubber, as required in opsonic and serological work; about 2 cc 
 
 capacity, as used in Dr. Wright's laboratories -15 
 
 Rubber Bulbs, of pure black gum, "for dropping pipettes, medicine droppers, etc. ; superior quality. 
 
 Capacit jr, cc (approximate) 2 3 5 
 
 SO 
 
 1.10 
 
 100 
 
 100 
 
 c 
 
 2.10 
 
 Per dozen. 
 
 Per gross 
 
 Rubber Bulbs, of red non-blooming 
 
 Capacity, ounces 
 
 Length, inches 
 
 Diameter, inches 
 
 Each 
 
 .45 
 
 .50 
 5.50 
 
 .60 
 6.75 
 
 •ubber, stout walled, for pipettes. 
 
4(ill2. 
 4611 (i. 
 46120. 
 4f>124. 
 
 4r,12s. 
 
 46132. 
 4613G. 
 
 4614(1. 
 46144. 
 
 Rubber Bulbs, of wliitf composition rubber, 1 pettes, etc- 
 
 I.eiigth, inches 3j 3^ 
 
 Diameter, inches H J-ii 
 
 Each 20 " " " .25" 
 
 Rubber Bulb, with single valve, without extension tube, of white rubber 2-^ in. long by 2 in. diam. 
 
 .30 
 .2.5 
 
 Rubber Bulb, with two valves, of white rubber, with 5 inches of tubing. . 
 
 " of pure black gum, with long flexible tube, for use with gas analysis apparatus 60 
 
 " with two valves, of hard rubber, giving the exhaust and pressure, i. e., the first com- 
 pression of the bulb releases blast from one end, after which suction is produced from the oppo- 
 site end when the bulb resumes its usual shape. As used in gas analysis, etc 50 
 
 Rubber Bulb, double, of pure black gum, with heavy .silk net, for constant pressure 2.00 
 
 " of black acid-cured rubber, with double valve set in bone fitting.^ 2.50 
 
 Rubber Caps, for covering tops of test tubes, cylinders, etc., with rolled edges 
 
 Diameter, inches 
 
 Per dozen 45 
 
 Per gross 4.75 
 
 Rubber Finger Cols, of pure gum, heavy weight. 
 
 Per dozen ' 
 
 Rubber Finger Cots, of thinnest rubber tissue, for surgical use 
 
 It 
 
 .50 .52 
 5.00 5.25 
 
 Size,. £ 
 
 .60 
 5.75 7 
 
 .75 
 
 8.50 9.75 
 Ijarge 
 
 1.10 1.95 
 U.OO 19.50 
 
 Thumb 
 
 r dozen. 
 
 ^ 
 
 ^u I I No ibi s 
 
 4( I4S Rubber Glomes I puie a'^m chctjUte »ht. Sizes 6 to 10. Pit i t specify size m 
 ordering. No. 8 or No. 9 is required tor normal male hand. Per pair 1,75 
 
 46i-'i2. Rubber Gloves, of thinuest pure gum tissue, smooth finish, as used by surgeons. Sizes 6 to 10. Please 
 .specify si/o in uidoring. Per pair 1.35 
 
 46156. Rubber Gloves, ol !ic;tv\' white rubber, so-called "acid gloves." Gloves measure 8^ inches from tip 
 of thumb lii end of gauntlet. Sizes 8, 9 and 10. Per pair 3.00 
 
 46160. Rubber Gloves, of medium weight black rubber, with thin cotton lining and widely used in leading 
 
 hospitals and laboratories for post mortem work, handling of pathological material, etc., with 
 gauntlet. SiKes 6 to 10- Per pair 2.50 
 
 46161. Rubber Policemen, for washing down precipitates, narrow shape, with glass rod. Per dozen .... 1.00 
 
 1616S. Rubber Policemen, wing shape, with glass rod. Per dozen 1.00 
 
 46172. " " new form, with glas.s rod. Per dozen 1,50 
 
 46176. " " with hard rubber handle and soft, cone shaped tip. Each 25 
 
 476 
 
ARTHUR H. THOMAS COMPANY 
 
 DIAGRAMS SHOWING EXACT SIZES OF THE MOST USED NUMBERS OF RUBBER STOPPERS 
 No. 46IS0 REGULAR SHAPE 
 
 No. 461S0— Esact Siz. 
 
 No. JG180— Esact Si 
 
 DIAGRAMS SHOWING EXACT SIZES OF THE MOST USED NUMBERS OF RUBBER STOPPERS 
 No. 461SS EXTRA LONG SHAPE 
 
 No. 4618S— Exact 
 
 No. 4G1S8— Exacl Si 
 
Rubber Stoppers, A, H, T. Co. Special Quality, made of selected stock containing a large per cent or 
 piuc rar;i gum and distinctly superior to the stoppers ordinarily sold as pure gum. Each stopper 
 bears our trade mark. They are carried in stock as solid, one hole or two hole, which speci- 
 fication must be given with order. When no specification is given solid stoppers are sent. Exact 
 size of each number of stopper is shown in the diagram. 
 
 00 
 
 17 
 
 1 
 
 2.011 
 
 2.00 
 
 .S.S 
 12 
 
 49 
 2.00 
 9 
 44 
 30 
 10 
 
 18 
 
 .36 
 
 2.00 
 
 10 
 
 .50 
 
 Number. 
 
 Diameter at top, mm 
 
 " " bottom, mm 
 
 Number of solid stoppers per lb. 
 
 Per lb 
 
 Number 
 
 Diameter at top, mm 
 
 " " bottom, mm 
 
 Nundter of solid stoppers per lb. 
 
 Per lb 2.00 2.00 2.00 2.00 
 
 Rubber Stoppers, same quality as No. 46180 but of red or antimony rubber. Siz 
 
 as Kn. lOl.SO. Per lb : 
 
 Rubber Stoppers, exactly same quality as No. 46180, but new extra long shape. 
 
 Number ^ ' 20 21 22 23 
 
 Diameter at top, mm 22 2.5 26 28 
 
 " " bottom, mm 17 19 20 22 
 
 Number of solid stoppers per lb 38 27 23 20 
 
 26 
 20 
 30 
 2.00 
 11 
 .50 
 50 
 
 27 
 23 
 24 
 2.00 
 12 
 65 
 
 32 
 
 60 
 4 
 
 2.00 2.00 2.00 
 
 ;s and numbers same 
 4.00 
 
 23 
 
 _18_ 
 
 2m 
 
 28 
 ^1 
 2.00 
 
 2G 
 40 
 34 
 7 
 2.1)0 
 
 Per lb 2.00 2.00 2.00 2.00 
 
 Note — We furnish the ordinary pure gum stopper of the rubber trade on special order onlj' at price 
 
 very much lower than that charged for our special quality. 
 
 40192. Rubber Stoppers, for use with the official Brown Duvel Moisture Tester in stoppered glass and copper 
 
 fl isks Made of a special composition to iMthstand high temperatures See Bulletin 56 of (he 
 
 T s Bui Luu if Plant Indu^liy Size No 5 one hole Per dozen 1.25 
 
 
 4619(i, Rubber Tissue, f.r ilciital tl;ti,i, per oz .35 
 
 46200. Rubber Tubing, Thick Wali, of pure black unvuJc-anized gum. Thi,s tubing is tlie best imported quality 
 without ;iiiY bloom and, for many purposes, is the best tubing made. For convenience and 
 cciinoinv' we have it put up in the European factory in neat circular boxes containing 10 ft. and 
 2o ft. I'njrHi^^ C.'iistomers are encouraged to use these original packages as far as possible. 
 On l.'ii 'ji I : I..' .! 1' - 1 aken at one timr wc (jnote on application a price per pound somewhat lower 
 than 1 : ■ |.i !■ .■ II - foot. 
 
 - Insidi- ■.'l:Ul 
 
 Thickness of wall, mm 
 
 Per foot in less than original lin 
 Per foot in 10 or 25 ft. lengths 
 
 8 
 
 U 
 
 If 
 
 15 
 3 
 
 IS 
 3 
 
 25 
 4 
 
 .80 
 .65 
 
 .90 
 
 .75 
 
 1.65 
 1.40 
 
 No. 46204 
 
 Rubber Tubing. Thin Wali, samr ^n:y\\\y as \n. 46200. 
 
 Inside diameter, mm li .3 4 
 
 Thickness of wall, mm f \ \ 
 
 Per foot when cut in lesH than original lengths. .05 .06 .09 
 
 Per foot in 10 or 2.5 ft. lengths 04 .05 .07 
 
 Rubber Tubing, Extra Thick Wall, same quality and color as Xo. 40200. 
 
 Inside diameter, mm. 4 
 
 Thickness of wall, mm 3 
 
 Per foot .15 
 
 No 
 
 . 115209 
 
 
 
 
 
 
 6 
 
 S 
 
 
 
 
 12 
 
 
 1 
 
 li 
 
 
 1« 
 
 2 
 
 .i 
 
 .IS 
 
 
 .25 
 
 ..15 
 
 
 12 
 
 .15 
 
 
 .20 
 
 .30 
 
 5 
 
 
 
 6 
 
 
 8 
 
 3 
 
 
 
 25 
 
 
 3 
 
 20 
 
 
 ..30 
 
Rubber Tubing, Thick Wall, of L-xacUy tliu hmm .iwAhy as No 
 unvulcaiiized gum. 
 
 Inside diameter, mm :J -i 5 
 
 Thickness of wall, mm U ] ; 1'; 
 
 Per foot in less than original lengthy .1(1 .12 ,15 
 Per foot in 10 or 25 ft. lengths (IS .10 .V2 
 
 Rubber Tubing, Thin Wall, same as No. 40212. 
 
 Inside diameter, mm \\ 
 
 Thickness of wall, mm -f 
 
 Per foot in less than original lengths (Hi 
 
 Per loot in 10 or 25 ft. lengths 05 
 
 1I3'J).S but 1 
 
 if pure rod 
 
 VJ 15 
 3 3 
 
 18 2.5 
 3 4 
 
 .(i(i .83 
 .55 .70 
 
 .95 1.80 
 .80 1.50 
 
 4(i220. Rubber Tubing, Thick Wall, Hand Made, Cloth Wrapped. ihi.s i^ an oxtut hnc quality of flexible 
 tubing, guaranteed not to split and of great endurance when exposed to laboratory fumes. It 
 is not regularly to be had in the rubber trade and is made specially for us and bears our trade- 
 mark at frequent intervals. The :i x -Jth inch is the standard size for Bunsen burner connections. 
 
 Inside diameter, inches i A j /b I ^s I i 1 
 
 Thickness of wall, inches /? jV \ I I v j I j 
 
 Per foot in less than original length 0(> .10 .12 AH .20 .25 .30 .34 .50 
 
 Per foot in original 12 ft. lengths 04 .08 .10 .13 .15 .20 .24 .2(5 .40 
 
 46224. Rubber Tubing, Thin Wall, Hand Made, Cloth Wrapped; same quality as above but with thinner 
 wall. The t x -^ inch size is that mostly used for Bunsen burner connections. 
 
 Inside diameter, inches i A i A' » i 
 
 Thickness of wall, inches _ ra tV tV t^s A A 
 
 Per foot in less than original lengths.., .05 .07 .10 ,12 .20 .25 
 
 Per foot in original 12 ft. lengths 04 .05 .OS .10 .16 .20 
 
 46228. Rubber Tubing, Pressure. Black, sppcially selected for use on Nitrometers. All our Nitrometers 
 when ordered complete ure filled with this special tubing. Inside diameter ^ inch with tVth 
 iiirli wall. Per foot 45 
 
 No. 46232 
 
 Rubber Tubing. Pressure, of black semi-pure gum, very rigid to withstand heavy pressures, 
 mended for use with filter pumps and similar connections. 
 
 Inside diameter, inches i t% ' I 
 
 Thickness of wall, inches i ik r^ i_ 
 
 Per foot 20 .26 .36 .50 
 
 Recom- 
 
 i 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 1628D 
 
 4li24S. 
 46252. 
 
 46256. 
 462fi0. 
 
 46264. 
 
 46268. 
 
 46272. 
 46276. 
 462ft0. 
 
 Rubber Tubing, for Gooch Crucibles, so-called "band" tubing, very elastic. Tiie inside diameter 
 given is when measured in cylindrical shape, i. e., in position as used on crucible, and outside 
 diameter is when measured flat. 
 
 Inside diameter, inches 1 1 li 11 
 
 Outside diameter, inches 1 li 1-^ U 
 
 Per foot T20 .25 .36 " .38 
 
 Rubber Tubing, Composition, Machine Made. This tubing is very inferior to our hand made, cloth 
 wrapped tubing but is in some demand in laboratories and we carry in stock one size suit- 
 able for burner connections, etc., other sizes are furnished on order at lowest market price. 
 Inside diameter ]; inch by ^ inch wall. Per foot 05 
 
 Rubber Tubing, Pressure, with canvas insertion moulded in the rubber; for very heavy vacuum con- 
 nections. 
 
 Inside diameter, inches ys i ^ 2 
 
 Thickness of wall, inches _^ ys 1 _j 
 
 Per foot .30 .40 .60 1.00 
 
 Rubber Tubing Stretcher, for increasing bore of tubing for conveniently slipping over connection 
 tubes, etc 1-00 
 
 Rubber Viscosimeter, Frank, as used in the rubber industry and as adopted as standard by the Inter- 
 national Rubber Testing Committee. See Gummizeiiung Nr. 27, 1911, and the India Rubber 
 Journal, Vol. XLI, April, 1911. In wooden case, with thermometer, test solution and author's 
 certificate of accuracy. 
 Duty Free 17.50 Duty Paid 25.00 
 
 Rupert Drops, per ten 30 
 
 Sampler, Jones, for convenient, rapid and uniform sampling of ores, cement, etc. ; consisting of a hopper, 
 scoop, 4 sampling pans and brush. All parts may be readily cleaned. 
 
 Size, inches 4x4 6x6 SxlO 
 
 Trays, inches \ \ 1 
 
 Each 10.00 12.00 IS.OO 
 
 Sampler, with Scoop, 6 inches square with divisions \ inch wide 2.00 
 
 Sand Baths, deep form, of sheet iron. 
 
 Diameter, inches _3 4 5 6__ 7 __8 }^ 
 
 Each 10 .12 .15 .20' .30 \40 ' .80 
 
 Sand Baths, shallow form, of sheet iron. 
 
 Diameter, inches... 2 3 4 5 6 7 _8 10 
 
 Each .08 .10 .12 .15 .18 .20 .30 .45 
 
 Sand Baths, of wrought iron, with burner to heat entire surface: adjustable to height. 
 
 f^ize, cm 25 X 15 40 x 20 60 x 45 
 
 Each 7.50 S.50 r4.00 
 
 Sand Baths, or Hot Plates, of iron, without burner. 
 
 Size, inches 6x S S x 10 10 \ 12 
 
 Each 1-50 2.00 2.50 
 
No. 462SJ 
 46284 
 
 No. .1(1320 No. -lliaiK 
 
 Sand Glasses, in polished wornlen fnuiK^ 
 
 Time, minutos _ j_ ^ 1 2 3 3 6 10 30 60 
 
 Each 30 .30 "TSO ^0 .30 "Tib ^40 ^75~T.50~27bO 
 
 Sand Glasses, for screwing to table or wall in vertical position; in brass lacquered mount. 
 
 Time, minutes 1 2 3 o 
 
 Each, . , ^90 M iTo'O 1.00 
 
 "Schalchen," Hofmeister, of very thin glass, about 2^ inches in diameter, as used in organic analysis. 
 Each.. 
 
 100 
 .20 
 
 CO 
 
 80 
 
 .30 
 
 100 
 .35 
 
 40296. Scoop, Weighing, of German silver, with fiattcr!ed bottom; total length 4^ inches 
 46300. Scoop, of horn, shallow form, with handle. 
 
 Length, mm 
 
 Each 
 
 46304. Scoop, of horn, deep form, without handle. 
 
 Length, mm 
 
 Each .20" .2; 
 
 46305. Scoop, Weighing, of glass, shallow form with flat bottom. 
 
 Length, inches 
 
 Each 
 
 4G312. Scoop. Weighing, of glass, deep form, with flat bottom. 
 
 Length, inches 
 
 Each 
 
 46316. Scorifiers, Battersea original make. 
 
 Diameter, inches 2 2} 2. 
 
 Per dozen i^20 .25~ .21 
 
 Per 100 1.20 1.25 1.3:, 
 
 46320. Screw Driver, watch-maker's, nickel plated, very convenient in the laboratory for use on opt 
 
 other instruments; 5 inches long 
 
 46324. Screw Drivers, as above, set of four sizes, i,e . 3^, 4, 4-| and .5 inches long. Per set 
 46328. Screw Driver, o|)tirianfi, 3 inches long, with three blades, large, mci" 
 
 3.00 
 
 .40 
 
 1.70 
 
 2.10 
 
 1 and 
 
 1.00 
 
 um and smal 1 60 
 
 -■_LjyiiiiMwiiiw I fflf 
 
 46318. 
 ■163.52. 
 
 Nos 4fo4S 4b5.,2 4fi35G Nt 
 
 Selenium Cell, mounted, with 46x26 mm working surface, ebonite case, glafas 
 
 cover and brass slide for darkening the window. The selenium is spread omj Free 
 
 over platinum iridium wire _. 25. .50 
 
 Selenium Cell, a,s above but unmounted. Fig. A of illustration 15.00 
 
 Manomefric Flame Apparatus with single flame acetylene burner and speak- 
 ing tube, on stand. Fig.s. B and C of illustration 6.90 
 
 Acetylene Generator, small. Fig. D of Illnstration 6-00 
 
 Uul) I'ak) 
 32.3(1 
 19.00 
 
H U 
 
 R 
 
 Selenium Ceil, of new construction anci great scn«ihility. 'J'liewc cells are mounted air-tight so that 
 it is unnecessary to enclose them in exhausted vessels. The light of a match will reduce the 
 resistance which the cell has in the dark by from 10% to 20%. The diameters given are for the 
 sensitive surface and the cells are supplied in ebonite mount with terminals. 
 
 Diameter 45 CO 
 
 DutjFrec 9-25 11.90 
 
 Duty Paid 12-25 15.90 
 
 lilectromasnelic Rohiv, y,i high scnsibilitv, with siHTial contact, for use with above cells. 
 
 Duty Free 7.20 Duly Paid 
 
 75 
 14.60 
 19.50 
 
 9.60 
 
 SH.\KING APP.\RATUS 
 
 
 
 4fi381 . 
 
 4(i3ftJ. 
 
 4(i3Sr>. 
 -ir,3!)2. 
 
 46390. 
 46400. 
 46401. 
 
 [. J J ft h c Lo le H ad No 4 31 th ) 1h Frrenmeyer Flask Head 
 
 Shaking Apparatus for Sputum. Itickiirds. 'Ilij.^ niinliiiii' i I I t I 1 ■ uhcJ in many 
 large laboratories \^■lM■l !■ i 'H' n '■ -r ii im -.■ i. ' ■ - ,|,i[[( I It, Ihc new model is a dis- 
 tinct improvement, i- ■ ■ ■ ii -.1 ■.. : . hi.- I „ the apee I The sputum is 
 
 shaken in the ori^ii^il Imi.i ji- m ^ inr i, , , ,^ culli rinl I 1 \ith electric motor only. 
 
 .^ , ilovnitg, (1. c. 22t vol s d c UO volls a c 221) volts, a. c. 
 
 For, current en cyt les Bo cyclen 
 
 Each 90.00 9J 00 97 00 ~9l).00~ 
 
 Head, only, for abovp Hhakinif Apparatus, carryinu 4 1 1 1 f 1 lOUl) co capacity 40.00 
 
 Shaking Apparatus, exactly same as above, but with 4-1 hm ttles of any size from 
 
 12.J t(i luon (•(.■ capacity. Speed may be varied from H | ei minute, according 
 
 to the Innrl. A practical and satisfactory apparatu.^^ !■ xrcmes, etc. 
 
 no volts, d.c. :;j( sac 220volta, a. c. 
 
 •current c cies 60crcles_ 
 
 Each 90.00 93 0(1 J 00 99.00 
 
 Head, nnly, for above SJiakinp: Apparatus, carrvinc; 24 bottles 40.00 
 
 Shaking Apparatus in ('ombi nation with Low Speed Centrifuge. As a shaking: ili\ i.i' i lii- 'iiparatus 
 
 is fiu-TiLshcfl wilh twf. Iie:nls, <ii.e Size taking 2 M •■<■ buttles or two testtiiL ■!,■ , inches in 
 Ifii-lh and with which a. iiiaximiLni ypee^ i^f lOllll r. p. m. is obtained. I !.■■ ■■■ I ,:,,1 takes 
 2-5U0 cc bottlcB lit a nKLxinuiin speed of 31)0 r. p. in. These heads may l")e ti^ iil mu-i rhangeably 
 with the 2-p>lcnmeyer Flask head. Price is the same for the Shaker with either the 2-M cc bottle or 
 2-500 cc bottle head, but doea not include the 2-Erlenmeyer flask centrifuge head. 
 
 110 volta, d. c. 220 vo'lta, d. c, 110 voltg, n. c. 220 volts, a. c. 
 
 Current _ eo^cydes so cycles 
 
 Each " 55.00 " 59.00 65.00 67.00 
 
 Head, only, 2-Erlenmeyer Flask Centrifuge Head, for attachment to above Shaker 10.00 
 
 Head, only. 2-bottle Shaker Head. This head may also be attached to No. 24061 Centrifuge 20.00 
 Head, only, l-bo|,tle Shaker Head. This head may also be attached to N'o. 24IS t ContrifuKe 22.00 
 
A R THUR H. THOM 
 
 AS COMPANY 
 
 46412. 
 46416. 
 
 Shaking Apparatus, Hearson, with Water Bath. For maintainitig a constant temperature between 30° 
 
 and 90° C, Price includes thermometer, burner, capsule and motor for 110 volts direct current. 
 
 As the range of each capsule is about 15° C, temperature at which the bath is to be used should 
 
 be stated in ordering. 
 
 Duty Free 56.70 Duty Paid 85.05 
 
 Shaking Apparatus, Frankfurt model, latest noiseless construction, carrying one 1 liter flask or 6 
 
 smaller Erlennie\'er flasks. With water motor, as shown in illustration. 
 
 Duty Free 56.10 Duty Paid 67.35 
 
 Shaking Apparatus, as above. With electric motor. Voltage niusi he st:itcil in ordering. 
 
 DutvFree 69.30 Duly Paid 83.20 
 
 Shaking Apparatutt, t ikiut, either four small Erlenmeyer Flasks or four large test tubes, A simple 
 
 m 1 c n\ri nnt f mi of shaking apparatus of great efficiency. With water motor but without 
 
 felassw aie 15.00 
 
 46420. Shaking Apparatus, for one 1 
 liter bottle. With water tur- 
 bine as shown in illustration. 
 
 46424. Shaking Apparatus, as above, 
 for two 1 liter bottles 
 
 46428. Shaking Apparatus, as above, 
 for one 1 liter bottle, without 
 turbine, for either hand or 
 power driving 
 
 46432. Shaking Apparatus, .same as 
 above but for two 1 liter bot- 
 tles 
 
 46436. Shaking Apparatus, for large 
 bottles, operating on the 
 same principle as above, for 
 two 5 liter bottles, for power 
 driving 
 
 46440. Shaking Apparatus, as above, 
 for four 5 liter bottles 
 
 Duty Free Duty Paid 
 13.20 16.00 
 
 24.75 30.00 
 
 29.70 .36.00 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 46444 No. 46448 
 
 Shaking Apparatus (Kinotherm), Uhlenhuth, for shaldng inconstant temperature. Without burnefj 
 thermometer, or thermo-regulator. Wee P. Uhlenhidh iind A. Weidanz; Praki Anleitung zur 
 Au^Jiihriing des bioloijischen Ein-eissdifferenzierungsverjaJti-ens, S 150, Jena 1909. 
 
 Motor Water Allernating CurrenI Direct Current 
 
 Duty Free 28.05 49.50 44.55 
 
 Duty Paid 33.70 59.40 53.50 
 
 Shaking Apparatus, Poppe. for the preparation of organic extracts, emulsions, etc.; taking four Erlen- 
 meyer flasks. With water motor 20.00 
 
 it^ 
 
 I 
 
 (f s\''if" 
 
 
 No. 4GI52 
 
 4i)452. Shaking Apparatus, New Model, with electric driving, of robiiHt aiul rigii.1 construction for continuous 
 operation; with eccentricity of the stroke readily changeable. Motor is furnished for both alter- 
 nating and direct currents, 110 and 220 volts. Voltage must be stated in ordering. 
 Duty Free 48.00 Duty Paid 57.60 
 
 4(i456. Shaking Apparatus, Camp, (Patented) particularly suited for the rapid precipitation of phosphorous 
 by the iiiolylnlic rnctliod, and dissolving steels or pig-iron for carbon combustion. Made to 
 holdti ll;isks liniii r, ii> ji nonces, either Florence or Erlenmeycr shape; pulley 6 inches in diameter; 
 power ri i[uiirr| Ml.niii ,' , II. P. Can be operated by small electric motor with suitable counter- 
 shaft to coil I ml sj)cud, or by direct connection to a water motor 27.50 
 

 Shaking \pparatus Camp as abo-ve but I I i 1 | nii ! t 1 v 1 mietnc 
 
 fl ^k^ lUO r tar ".ugai anal>bi'! ct 35 00 
 
 Shaking Apparatus, Freas. Electric, speciallj designed loi .-btiakiiig suil samples at constant tempera- 
 ture; it can, however, be successfully employed for other purposes requiring constant tempera- 
 ture below 175° C. Consisting of a rectangular oven built of asbestos wood, inside dimensions 14 
 inches high, 14 inches deep, 30 inches wide; equipped with a shaft to which is fitted six double 
 adjustable clamps, easily removable for holding 12 wide mouth bottles, 12 ounce capacity. The 
 shaft is rotated by means of an electric motor fitted as shown in the illustration. The shaft 
 can easily be removed to permit of the chamber being used as an oven. The heatingis accom- 
 plished bj 1 flat re'-istance ^irc ^\ound heating pUte, while the devices for maintaining con- 
 stant temper-iture ind qun kh stfting for an-^ dp'^ired temperature are identical with those 
 employed in thi Fieas Llortin U\ens Mounted on heavy iron stand as shown in illus- 
 tnti Ti rnjilete with motci iiid 12 shss st >pp rr i hnttl^'s. 350 re <'apacitY 175.00 
 
46504. 
 46508. 
 
 46512. 
 46516. 
 46520. 
 46524. 
 
 4S.52S. 
 46532. 
 46536. 
 
 46542. 
 46544. 
 
 with short blades, for general laboratory use; total length 85 inches, length 
 hes 1.00 
 
 f metal and wire. 
 ', inc-hes 
 
 Total length, inches. . 
 
 Shears, for (.loth, with nickeled bh Jes ni jaj ai ne 1 h nil 
 
 Total length, inches (j s 10 12 
 
 Length of cutting edge, inches 2i 3| 5 6 
 
 Each 750 .75 1.00 ^ "Os 
 
 Shears, sfmn- .,,,,1 ■ ■ - - 
 
 of .-III- I 
 Shears. Tl 
 
 Leiiglii ,J .'ii 
 
 Each 
 
 Sieves. Brass Gauze, with Wooden Frame. 
 
 .Me.-h _ 10 
 
 Each, 6 inches diameter 35 
 
 Each, ,S inches diameter .45 
 
 Each, 10 inches diameter 60 
 
 Each, 12 inches diameter 
 
 Sieves, Brass Gauze with Brass Frame, wit 
 
 I\Iesh 10 
 
 Each, 5 inches diameter 1.00 
 
 Each, 8 inches diameter 1,.50 
 
 Cover and Receiver, for above sieves. For, 
 
 Each 
 
 Sieves, Brass, in nest of five, 20, 40, 60, 80 and 100 mesh, with cover and receive 
 
 Diameter, inches 5 ^ 
 
 P<" "est 6.00 97o6 
 
 Sieve. Brass, with four removable brass plates with circular openings of i, i, 1 and 2 mm diameter, 
 
 respectively. Ihe plates may be quickly attached and detached; 90 mm diameter 5.00 
 
 Sieves, Standard Testing, with seamless brass frame, according to the specifications of the American 
 
 toociety of Civil Engineers. These sieves are distinctly superior to those made of ordinarily woven 
 
 brass cloth as the screen is absolutely square in mesh and made from the same gauge wire both 
 
 ways; 8 inches m diameter. 
 
 .70 .70 
 
 lut cover or receiver. 
 
 20 _ _40 
 
 1.00" 1.10 
 1.50 1.60 
 lianieter, inches 
 
 40 
 
 .70 
 
 60 
 1.26 
 
 1.50 
 
 60 
 .50 
 
 1.10 
 
 1.30 
 1.80 
 
 Hi 
 
 2.00 
 
 .85 
 1.10 
 1.35 
 1.50 
 
 100 _ 
 1.40 
 2.60 
 5 
 1.00 
 
 125 
 
 2.25 
 
 100 
 
 1.40 
 1.75 
 
 200 
 
 1.10 
 
 Mesh 
 
 Opening, inches 
 
 " mm 
 
 Diameter of wire, inche 
 
 Each 
 
 Mesh 
 
 Opening, inches 
 
 " mm 
 
 Diameter of wire, inche 
 
 Each 
 
 Mesh 
 
 Opening, inches 0038 
 
 " mm 096 
 
 Diameter of wire, inches 0025 
 
 Each 
 
 Cover and Receiver for .above, per : 
 
 024 
 6.40 
 
 t of one each 
 
 40 
 
 .0150 
 .381 
 .0 10 
 3.00 
 110 
 
 .0051 
 .130 
 .004 
 4.45 
 190 
 
 .0031 
 .079 
 
 .0 022 
 7.35 
 
 45 
 
 .0127 
 
 .323 
 
 .0095^ 
 
 3.25 " 
 
 120 
 
 .0040 
 
 .117 
 
 .0037 
 
 4.60 
 
 200 
 
 .0029 
 
 .074 
 
 JX)21_ 
 
 7.60 
 
 50 
 .0110 
 .279 
 . 009 
 3.25 
 130 
 .0043 
 .109 
 .0 034 
 4.95 
 220 
 .0028 
 .071 
 
 8.20 
 
 .0087 
 .221 
 .008_ 
 3:25 
 140 
 
 .0042 
 .107 
 
 .0029 
 5.20 
 240 
 
 .0026 
 .066 
 
 .0016 
 
 70 
 .0073 
 .1,85 
 .007 
 3.40 
 150 
 0041 
 .104 
 .0026 
 5.50 
 300 
 .0017 
 .043 
 .0016 
 
ARTHUR H. THOMAS COMPANY 
 
 46552. Sieves, Standard Testing, as above, but in a telescoping nest of 8 sieves, varying in diameter from 5 to 
 Si- inches and consisting of one each of 10, 20, 30, 40, 50, 80, 100 and 200 mesh. Per set. . 15.00 
 
 46556. Sieve, Cement, Bureau of Standards, of brass, 20 cm in diameter and 6 cm high, with standard woven 
 brass screen. The 100 mesh sieve has .0055-inch openings and the 200 mesh has .0029-inch 
 openings. 
 
 Mesh 100 200 
 
 Each, with Bureau of Standards certificate li.OO 12.00 
 
 46560. Sieve, Sand, Bureau of Standards, of brass, 20 cm in diameter and G cjn high. 
 
 iVlesh 20 30 
 
 Openings, inches ; 0.0335 0.Q223 
 
 Each, with Bureau of Standards certificate 6.00 6.00 
 
 46564. Sieve, Brass, with circular openings in bottom as used in soil and fertilizer work; with seamless brass 
 frame; 5 inches in diameter; of same construction as No. 46528 and 46532. 
 
 Size of openings, mm ■ ^ 1 2 3 5 
 
 Each 
 
 1.50 
 
 IM 
 
 1.25 
 
 1.25 
 
 1.25 
 
 Sieves, Brass, in set of 5 as above, with circular openings '>, 1, 2, 3 and 5 mm; 5 inches in diameter, with 
 cover and receiver. Per set 7.75 
 
 46572. Sieve Shaking Machine, fur luotur driving. The horizontal motion takes place on ball liearings oper- 
 ating in oil and the machine is noiseless in operation. With an enamelled sieve of 200 mm diame- 
 ter with 6 inserts same diameter. Other sieves of same diameter in varying numbers may be 
 used on this machine, being conveniently held in place by the strap over the top as shown in 
 illustration 25 .00 
 
 46576. Sieve Shaker, Braun, for S inch standard sieves. This apparatus will be found a great time and labor 
 saver in grading samples of sand, cement, ores and other materials. In repeated tests, using 
 the same sample, identical results are obtained, which guarantees the reliability of this machine. 
 From one to eight sieves of 8 inch diameter can be placed in the machine at one time. These 
 sieves are mounted in a brass frame supported by a chain. The supporting arch is adjustable 
 so that when a small number of sieves are placed in the hanger it can be raised to the proper 
 height, thus allowing the surrounding frame to strike the sieves. A special hanger allows the 
 sieves to rotate slowly while being shaken. This rotation is caused by the peculiar shape of the 
 surrounding frame which strikes the sieve on all sides, securing a complete separation of the vari- 
 ous mesh products. The interior of the surrounding frame is lined with leather, which protects 
 the sieves. It is very light running and requires little effort to operate. In a test run, using a 
 10 gram sample of sand, it requires 7 minutes to obtain an accurate separation using 8 sieves from 
 10 to 200 mesh. For hand operation, without sieves "^, 50.00 
 
 465S0. Sieve Shaker, as above, but with electric motor drive, for either alternating current of 110 volts, 60 
 cycles, or directcurrent of 110 volts. Current must be specified in ordering. Without sieves. 90.00 
 
ARTHUR H. THOMAS COMPANY 
 
 Sieve Shaking Apparatus, iur u&n with either hand or power, on wooden base 11 x 2U inches, heig:ht 
 over all 17 inches. Will take conrenienll}- from one to four sieves up toO inches in diameter, 30.00 
 
 
 46,'>S8. Sieve Shaker, Per Se, taking standard 8 inch sieves, for power or hand driving; as used in sieving 
 rice, drugs, emery, corundum, fire clay, litharge, silica, sulphur, cement, phosphates, pigments, 
 sugar, gunpowder, guano, whiting, salt, starch, flour, linseed, cottonseed, boneblack, etc. The 
 mechanical motion secured in these shakers is an eccentric, semi-rotary motion with a vertical 
 drop. The sharp vertical drop or jog has been found very necessary in order to free the meshes 
 from those particles which would ordinarily remain in the apertures of the cloth and to which 
 in a great measure the efficiency of the device may be ascribed. These movements simulate very 
 closely those obtained in hand manipulation of individual screens and the results secured show 
 very close agreement between hand and the mechanical method. The machines are mounted 
 on solid base with firm clamping device for the sieves. Without sieves 90.00 
 
 .ir>592. Sieve Shaker, Per Se, as above but with directly connected direct current electric motor. Without 
 sieves 150.00 
 
46600, Silica Rod, Opaque Fused Silica, useful for stirring and pouriug at high Lcmperatures, particularly 
 in the case of high melting metals and alloys which do not form hasic oxides, also for the con- 
 struction of delicate physical apparatus where material i^ rcr[uiroil with extromely small coeffi- 
 cient of expansion. Furnished in lengths up to 6 ft. 
 
 Diameter, mm 1-2 3 4-3 6-7 S 9-10 
 
 Per foot 40 ..50 .75 1.00 1.25 1.40 
 
 46604. Silica Tubing, Opaque Fused Silica, The unglazed tubes, while rough on the outside, are glazed as 
 the ends and comparatively smooth on the inside. The glazed tubes are highly glazed on the 
 outside and at the ends, presenting a distinctive homogeneous structure throughout. The 
 unglazed tubing up to 9 mm bore is finished in so-called 8atin finish. Furnished in all of the 
 sizes listed in lengths up to S ft. but when lengths less than 1 ft. are ordered an advance of 10% 
 is made in price. Larger diameters are furnished at special price. 
 
 Bore, mm 1-2 3 4-5 6-7 8 9-10 11 12-13 14 15-16 17-18 
 
 Thickness of wall, mm .5-3 .5-2.5 .5 -2 .5-2 .5-2 1-2 ^■i_ 1-2 1-2,5 1-2.5 1-2.5 
 
 Unglazed, per foot 25 .45 .75 .90 1.10 1.25~r46~i.50 1.60 1.75 1.90 
 
 Glazed, per foot 1.75 2.10 2.25 2.40 
 
 Extra, closed at one end 10 .15 .20 .20 .20 .25 .25 .25 .35 .35 .50 
 
 Bore, mm 19 22 25 28-29 31-32 35 38 41 44 48 51 
 
 Thickness of wall, mm 1-3 1-3 1-3 2-4 2-4 2-5 2-5 2-5 2-5 2-5 2-5 
 
 Unglazed, per foot ", 2.10 2.30 2.50 2.75 2.90 3.00 3.20 3.35 3.50 3.75 3.90 
 
 Glazed, per foot 2.60 2.80 3.25 3.50 3.65 4.00 4.20 4.50 4.75 5.10 5.30 
 
 Extra, closed at one end 50 .65 .75 .75 .75 .90 .90 .90 1.00 1.00 1.00 
 
 Slide Rule, Nestler, for chemical calculations; of mahogany, with scale on white celluloid; providing 
 for all calculations as met with in chemical practice. Complete in case with instructions for 
 use 4.50 
 
 No 46bL. Front 
 
 ■ : 
 
 ].l | I I jIU^l 1-^% I ll 
 
 r 
 
 No 46612 Back 
 
 Slide Rule, Duplex, designed to adapt the lo^authmiL and cologJiithmic bL.aleb to the rapid solution 
 of the problems encountered by the chemist. The symbols on the rule, being arranged in the 
 order of their molecular weight, are easily found, while the application of a very simple rule 
 enables the chemist to locate other symbols of less frequent occurrence. The rule carries 138 
 chemical symbols which include the common acids, bases, salts, oxides, and elements. As each 
 symbol has its individual position corresponding to the logarithm of its molecular weight, the 
 number of permutations and combinations possible covers the requirements of almost any prob- 
 lem. By using the logarithmic and cologarithraic scales in conjunction with the chemical gauge 
 points, problems in Stoichiometry, such as gravimetric analysis, volumetric analysis, equivalents, 
 percentage composition, conversion factors, volume of gas from a given weight of substance at 
 different temperatures and pressures, and many other analogous problems are readily solved. 
 The rule is accompanied by a manual giving the theory of its use together with numerous examples 
 of both an arithmetical and chemical nature. Length 10 inches, engine divided, divisions on white 
 facings, glass indicator, in morocco covered case, witli directions g.OO 
 
■U^h- 
 
 Soil Borer, American type, regularly furnished witli shaft I meter long but can be supplied in any 
 length desired by means of extension pieces 1 meter in length. 
 
 Diameter of cutter, mm SO SO 10.5 _130 150 
 
 Duty Free 3.45 3.S0 4.15 5.15 5.75 
 
 Duty Paid 4.60 5.00 5.50 6.85 7.70 
 
 Extra Extension Pieces, 1 meter long. 
 
 Duty Free 1.15 Duty Paid 1.50 
 
 46624. 
 46628. 
 46632. 
 
 240 
 .40 
 
 1.50 
 "".70 
 
 1S5 
 
 23.5 
 
 2S0 
 
 150 
 
 Lsn 
 
 
 200 
 
 300 
 
 200 
 
 210 
 1.25 
 
 260 
 
 340 
 
 4666,'i. 
 46672. 
 
 Sodium Spoon, with ramrod and tube mounted on handle 
 
 Spatula. Glass, inilics long, with flat ground blade f inch wide 
 
 Horn, dotildc, with spatula on each end. 
 
 Length, mm lOJL 120 130 100 _ 
 
 Each 10 .12 .15 .25 
 
 Spatula, Bone, double, with spatula at each end. 
 
 Length, mm 
 
 Eac 1 
 
 Spatula, Solid Nickel, double, with spatula on eaili end, and not flexible. 
 
 Length, mm . 120 
 
 Each 50 
 
 Spatula, Porcelain, double, with spatula on each end. 
 
 Length, mm 105 130 100 
 
 Each 28 .28 .40 
 
 Spatula, Porcelain, single, i.e. with knob on one end and blade on other. 
 
 Length, mm 
 
 Each 
 
 Spatula, Steel, very flexible, with cocoa wood handle. 
 
 Length of blade, inches 3 4 5 
 
 Each .25 .26 .30 .40 
 
 Spatula, Steel, with nickel plated steel handle 
 
 Length of blade, inches _ 3 ^ 
 
 Each 45 .50 
 
 Spatula, Steel, with very flexible narrow blade and blackwood handle. Very convenient for weighing. 
 
 Length of blade, inches _3 4 5 6 
 
 Each 35 ,40" .50 " .60 
 
 Spatula, Hard Rubber throughout, with very thin flexible blade. 
 
 Length, inches 4 8 
 
 Each -45" ' .55 " .80 
 
 Spatula, folding form, i.e. like pocket knife; with thin flexible steel blade 5 inch wide and 3 inches 
 
 long, in ebony handle; very convenient for carrying in the pocket 75 
 
 .55 
 
 .70 
 
 
 .90 
 
 7 
 
 8 
 
 10 
 
 12 
 
 .50 
 
 .60 
 
 1.00 
 
 1.70 
 
 5 
 
 6 
 
 
 S 
 
 .60 
 
 .65 
 
 
 .90 
 
 Length of blade, inches.. 
 Each.. 
 
 with wide blade, so-called "Pill Knife," of a 
 
 1 with ebony handle. 
 
 .40 
 
 H 
 
No. 4fiG.' 
 4(i676. 
 
 4(iG80. 
 
 466S4. 
 
 4f>6S8. 
 
 46692. 
 
 46G9G. 
 4670(1. 
 
 No. -IGSSG No. 4li7IH) 
 
 Specific Gravity Bottle, Gay-Lussae, unadjusted, but with perforated stopper fur adjustment in ti<e 
 laboratory. 
 
 Capacity! cc 1 2 5 10 25 50 10_ 
 
 Each ~Ji) ~;20 ^^^ .20 .25 .30 .40 .50 
 
 Specific Gravity Bottle, same as Nc 46676 but accurately adjusted. 
 
 Capacity, cc 1 2 5 10 25 5f) 100 
 
 Each Teo""' M) ^^'M .70 .70 1.00 1.10 
 
 60 .60 .60 
 
 Specific Gravity Bottle, sauie as No. 46680 but in tin case with tare weight, 
 
 Capacity, re 10 25^ _ 50 100 
 
 Each ~iM 1.60 2.00 2.40 
 
 Specitic Gravity Bottle, in'w cduiciil .'shape, with thermometer reading to '■," ground into neck. 
 
 Cai.i-ivily, rr . 10 25 50 100 
 
 Each. 2.25 2.50 2.60 3.00 
 
 Specific Gravity Bottle, Boot, double wall with vacuum space between the walls. For constant tem- 
 perature work: with ground cap. Capacity, cc 25 50 
 
 Each 2.;i0 3.00 
 
 Specific Gravity Bottle, Kohl, with thermometer ground in the side tubulation and with capillary tube 
 ground in the central tubulation and divided in millimeters - 3.25 
 
 Specific Gravity Bottle, Regnault, for liquids, with ground in stopper. 
 
 Capacity, cc 25 50 
 
 Each 50 .60 
 
 Specific Gravity Bottle, Regnault, for solids, with ground in stopper and capillary ground into neck 
 
 of flask. Capacity, cc , , . 25 50 
 
 Each 75 .90 
 
 Specific Gravity Bottle, Reischauer, with ground in glass stopper and separate funnel tube for con- 
 venient filling. Capacity, cc 25 50 100 
 
 Each 1^0 1.25 1.50 
 
 Specific Gravity Bottle, same as No. 46708 but with millimeter divisions on neck. 
 
 Capacity, cc _2_5 _ ^50 _ 100 
 
 Each 1.50 1.75 " 2.00 
 
 Specific Gravity Bottle, Reischatier-Brinton. Consists of a 100 cc glass stoppered flask with special 
 narrow neck so made that the 100 cc mark falls low on neck. Furnished without calibration. 
 Empty flask with stopper weighs from 18 to 20 grams. Inside diameter of neck is 6 mm. See 
 Journal of Ihe Amcricm Pliannnr.eniival Associntion, August, 1912 1.25 
 
 If 
 
 W 
 
 46720 Nn. 4fi724 No. ■(S728 No. Ji;7;(2 No. 4G7.1G No. 46740 
 
 46720. Specific Gravity Bottle. Nicol tube form, for Iiquid.s 50 
 
 46724. " " " Hogarth, for iron ores and similar material 2.00 
 
 46728. Specific Gravity Bottle, Sprengel, with caps ground on 80 
 
 46732. " " " " with normal thermometer and ground in suction tube 4.00 
 
 46736. Specific Gravity Bottle, Walker, forliquids, according to Bulletin No. 109 of the U. S. Department of 
 
 Agriculture, Bureau of Chemistry 2.00 
 
 46740. Specific Gravity Bottle, Walker, as above, for viscous liquids 2.00 
 
No. 2385fi No. 4G744 No. 467^8 
 
 23844. 
 23848. 
 
 2385ti. 
 46744. 
 
 4074S. 
 2.3R40. 
 
 Specific Gravitj' Bottle, Le Chatelier, as used in cement testing 2.00 
 
 Specific Gravity Bottle, Le Chatelier, new form, in accordance with the U. S, Bureau of Standards 
 requirements and as used in the U. S. Government test for Portland Cement. See Circular No. 
 ■f.j o/ l/ie U. S. Bureau of Standards, without certificate 3.00 
 
 Specific Gravity Bottle, Le Chatelier, an above but with the certificate of the U. S. Bureau of Stand- 
 ards. ,. .' 5.00 
 
 Specific Gravity Bottle, Schuman, with tube graduated to 50 cc in -.'jths 2.50 
 
 " " " Thiirner, for solids, particularly coke and charcoal; also used for the deter- 
 mination of porosity; graduated from to 100 cc in -jths. Price includes cylinder 3.60 
 
 Specific Gravity Bottle, Hubbard, designed especially for bitumens, heavy oils, etc., with solid stopper 
 ground in, with an opening of 1.6 mm diameter instead of usual capillary. Capacity 24 cc. l.OO 
 
 Specific Gravity Apparatus, Jackson, for the true determination of the specific gravity of cement. 
 Consists of a special burette with bulb and stopcock and a special flask with ground in funnel 
 stopper of exactly the same bore as the burette. As described in the Journal of the Society of 
 
 Chemical Industry 15 June, 190^. No. 11, Vol. XXIII 6.00 
 
 Extra Flask, only, for use with above 2.00 
 
 SPECTROSCOPES, SPECTROGRAPHS, SPECTROPHOTOMETERS 
 .\ND ACCESSORIES 
 
 46800, Spectroscope, Direct \ision, iiorkr-t form, 90 mm long, with adjustable slit In case. 10.00 
 
 46804. " " " " " same as above but with comparison prism and illumi- 
 nating mirror 14.50 
 
 4»i808. Spectroscope, with adjustable telescope, adjustable slit and metal cover for the prism, with ubjevtive 
 
 15 mm diameter. 
 
 Duty Free 25.20 Stock 35.00i 
 
 4GSJ2. Spectroscope, with cylindrical cover for the prism (illustration shows same removed) with telescope,. 
 
 20 mm objective and scale tube. Slit adjustable by micrometer screw. With comparison prism 
 
 Duty Free 45.00 Stock 60.00 
 
ARTHUR H. THOMAS C O M P A N Y 
 
 No 46832 Optical Plan of No. 46S21 
 
 46S16 Spectroscope, \ogeI, Direct \ifaion, Schmidt & Haensch, total length 170 mm. With comparison prism, 
 illuminating nniioi, holder for small test tubes and six extra test tubes. In case. 
 Duty Free 13.65 Stock 18.20 
 
 46820. Stand for Direct Vision Spectroscopes, especially No. 46S16, with absorption trough 6.00 
 
 46824. Spectroscope, Martens, Direct Vision, Schmidt & Haensch, with comparison prism and wave length 
 scale. A rotating disc with lenses of different foci after Martens permits the accurate adjustment 
 of the telescope for any eye. The diagram above illustrates the operation of this spectroscope 
 when used without illuminating device which is only necessary with very weak spectra and 
 which may be operated by three cells of di'y battery. In case. 
 Duty Free 28.20 Duty Paid 37.60 
 
 46828. Spectroscope, same as above but with the addition of Beckmann electric lighting arrangement 
 with special cap for comparison prism, without accumulator. 
 Duty Free 41.70 Duty Paid 55.60 
 
 468.32, Stand for Direct Vision Spectroscopes, particularly designed for Martens Wave Length Spectroscopes 
 No. 46824 consisting of support, mirror glass, stage, clamp for spectroscope, absorption trough 
 and absorption tube, with polished wooden case taking both spectroscope and support. 
 Duty Free 21.45 Duty Paid 28.60 
 
 493 
 
3^S»S 
 
 Spectroscope Kirthoff Bunsen, Schmidt & Hacnsch, Model II, with enclosed prism case, rack and 
 
 I I I I'l'i- ilii' K.li ~(ii|".', 1 , aiiii objective, flint prism of dispersion C — F= 1°56' 
 
 II II I . Ml I h ucrometer head reading to i,',-,, mm, Ramsden ocular 
 
 s I . ■■:■ .■, -; J.. . ill uiienting device "S," wavelength scale, mirror for 
 11 I iiiii;iti iir. iKuiiin.aL.ij^ slit, adjustable table support and glass cell as shown 
 1 II 1 li I II Duty Free 73.95 Stock 98.65 
 
 Spectro-.cope Kinhotf-Bunsen, Schmidt & Haensch Model III, with unsymmetrical slit and 24 mm 
 h H ti\ t- I he micrometer adj ustment is furnished with a dispersion curve giving the wave 
 length fri difleient readings. With two Ramsden oculars of 28 and 11 mm focus, with cross 
 hiirs xMth flmt glass prism of Jena glass No. 0.102 Nn = 1.649. dispersion C — F = 1° 65', 
 face '''^ \ 31 mm photographic scale and mirror for illuminating slit. This instrument may be 
 used foi a gieat variety of work in connection with studies in both emissions and absorption 
 spectra, speetraphotometry, etc., and with the camera listed helow. 
 Duty Free 121.05 Duty Paid 161.50 
 
 4(i«44, Spectroscope, Hoffman, Direct Vision, Schmidt & Haensch, large model, with micrometer a<ljustment 
 for telescope tube permitting same to move over the entire spectrum, with direct vision prism 
 of dispersion C. - F = S^SO', telesoopeobjectiveof 200mmfocus, adjustable slit with comparison 
 prism, one ocular of 28 mm focus, with cross hairs, illuminated by prism inside, and one ocular 
 of II mm focus with pomter scale, telescope with rotating scale and mirror for illumination of 
 same. Suitable for general chemical analyses, wavelength determinations and for the securing 
 of light of a given wavelength for other optical purposes as in spectrophotometry, etc 
 Duty Free 119.75 Duty Paid 160.00 
 
 4(i848. Rutherford Prism, with mounting, dispersion C - F = 3° 26'. For use with Nos. 46840 and 46844 
 
 Duty Free 15.00 Dutv Paid 20 00 
 
 468.^52. Wavelength Scale for use with Rutherford prism. For use with Nos. 46840 and 46844 
 
 Duty Free 9.60 Duty Paid 12.80 
 
 4l>8r)(i. Photographic Camera for 6 X 9 cm plates, with achromatic objective of 260 mm, camera tulie and 
 plate holder for photography of visible spectra only but can be adapted with quartz lens, 
 uranium glass plate, etc., at an extra charge, for the ultra violet. For use with Nos 46840 
 
 and 46S44. Duty Free 80.25 Duty Paid 115.00 
 
 494 
 
ARTHUR H. THOMAS COMPANY 
 
 t^iM 
 
 46868. 
 
 46872. 
 46874. 
 46876. 
 46880. 
 46884. 
 
 Wavelength Spectrometer, Hilger Constant Devialion Type. Tlii^ inshiudciH , -liivr' [t-i hitroJuced 
 in 1904, has been found useful for a great ^^ i ■■■ i ;■,■!■ ■-■.- '!1 : .i - ■..■ ■ 1 .ue those 
 
 recommended for general spectrum analj'.-i.-. -i.. .i 1 1 | l.i. .i ,, i ■. ■ n ■ .,i.<,ii ,, ,■, , i ■, \"utting 
 photometer) and quantitative esti^mation of r.iirnci »;,|(-, ,!,,..■ -.w^i uyj:n-\'- -ili-.ian'r- MOKsessing 
 suitable absorption bands when in solution. Ai.Tcssoiif^ tor the iiil'iu-rc-W ;uid spectrum ob- 
 servations of Zeeman effect are also supplied on special order and are fully described in the 
 Hilger catalogue which will be sent upon application. The prism is of the "constant deviation" 
 type. The telescope and collimator are both rigidly fixed, sincf tn ri:i^-' tln'-ii^h the spectrum 
 it is only necessary to rotate the prism; and as a result a constnn 1 1. ■; i . . i : , id at which is at 
 once extremely convenient and mechanically sound. The tabic n: ..ln'i i In prism stands is 
 rotated by means of a fine steel screw, the point of which push(.■:^ :i^ n^-i .i [ ri>iecting arm or 
 the prism table. To the screw is fixed a drum on which the wavclen^th.s of the line under 
 observation are read off direct as indicated by the index which runs in a helical slot. In the 
 most recent instruments this index is on the side of the drum towards the eye; so that the 
 wavelengths of lines can be read off without quitting the eyepiece. The point of the micrometer 
 screw is of hardened steel, and is permanently fixed before the screw thread is cut, to avoid the 
 risk of periodic errors, the point forming one of the centers while the screw thread is being cut. 
 This hardened steel point presses against a steel plug in the above mentioned projectimr arm 
 of the prism table, itself flint-hard and optically polished. The telescope and collimator are 
 both rigidly fixed to the cast-iron base, and the whole is screwed to a strong cast-iron tripod. 
 The object glasses of both telescope and collimator are of llj inches (285 mm) focal length, and 
 I5 inches (31^ mm) clear aperture. The focussing of the telescope is obtained by the milled 
 ring, which can be seen in the figure on the body of the telescope. By the turning of this ring 
 the object glass is made to move by a carefully protected helical mechanism, the eyepiece 
 remaining always fixed. By this means a more accurate focussing adjustment is obtained, 
 without the liability to a sideway shift of the lines due to the focussing, which it is impossible 
 to entirely avoid in the older form. With prism of 1.65 refractive index Duty Free Duty Paid 
 
 for D, accurately calibrated from SSdfip, to SOO^iJ, 135.00 185.00 
 
 Wavelength Spectrometer, Hilger, exactly as above, but with denser prism, 
 i.e., 1.74 refractive index for D, and correspondingly increased accu- 
 racy of calibration, being from 390^;t to SOOn/i 149 85 205.35 
 
 Universal" Base attached to either of above. P'or detailed description of 
 
 universal base see No. 409OS 10.00 13.70 
 
 Protecting Cover for prism table , 2.84 3.90 
 
 Levelling Screws 5.00 6.85 
 
 Case, with lock and key, for either of above 7.70 10.55 
 
 Extra High-Power Eyepiece with its own zero adjusting cross-hairs 59.40 81.40 
 
 Shutter Eyepiece with lateral adjustment to bright pointer 21.60 29.60 
 
 Slide with light filters to the shutter eyepiece for giving the pointer any desired 
 color, by means of which an increase of accuracy and comfort in reading 
 
 can be secured, especially in the violet part of the spectrum 6.75 9.25 
 
 Note — This eyepiece has two shutters which can be shifted from cither side in the focal plane so as to 
 cover any desired part of the field, thereby observing any bright lines which, by their proximity 
 prevent the observation of feebler lines. The metal pointer, the extremity of which is ground 
 exceedingly fine and polished bright with the greatest care, is illuminated from above by a 
 mirror. This bright pointer is adjustable laterally by the two milled head screws below, go that 
 one can always return to the standard by setting the bright pointer on a reference line. 
 

 Jtr _ U 
 
 ENTEHEQATSTATIDNEBS 
 
 No, 46860 HUger Wavelength Speetromeler with Camera No. I S9- Altachod 
 Camera, with 21-iiich focus lens, tilting adjustment for accurately focussing the wiiolc spectrum, and 
 
 shutter for exposure. 
 
 Dut) Free 35.90 Duty Paid 49.20 
 
 Telescope fixed to side of the camera, and internal mirror with external milled head by means of which 
 
 the spectnun can be reflected into the telescope for observation immediately before photography. 
 
 Duty Free 54.00 Duty Paid 74.00 
 
 Replica of" Rowland Diffraction Grating, interchangeable \\ith the pri^m Only supplied if ordered with 
 
 the Spectrometer. Price includes calibration m wavelengths foi both prism and grating. 
 
 Duty Free 59.55 Duty Paid 81.60 
 
 Apochromatic Triple Object Glasses. In place of the nsu U adiromatic doublet object gh'isses extra. 
 
 Duty Free 35.10 Dut> Paid 48.10 
 
 Hilijer Wavelenglh Spcclrometcr with Universal Buse and NuUini; PolarL-jafion Photometer Allachmenl in position 
 and Stand Tor two parallel beams or liglit 
 
 Wavelength Spectrometer, Hilger Constant Deviation Type, with Universal Base, in which the base 
 l>late and tripod are of 1 he form slmw n, I lir 1 1 i]>("l l.ciiiji heavier and larger than in the ordinary 
 Wavelcniitli i-^iieitionii-iri ;hmI tln' l):i->-|ilii' lu ■■. i iil: :ui r\t ended arm. The base-plate is drilled 
 with .-ill iirrr><:ii\- linlrs Inr ilii' .-n M 1 1 "'i ■■ I.:' ~-..iiiin'^ I'liotometer. The Universal Base also 
 providi'.-^ Inr I lie aU acljinriii -A uln' ■ :\ i;.'' !■ :i .■1--1 n ir.- for high resolving poiver (Michelson 
 eehfliiM, l.iiiLiiiici-(irlirikc pl:<te, inin I ,iln \ -]'■ mi ii jlmi 1. ^\'ith prism of l.fiS refractive index 
 for I), ;iii4 I'liiversal Base. 
 Duty Free 143.10 Duty Paid 196.10 
 
 Wavelength Spectrometer, Hilger, with Universal Base, as almve, but with Duty Free Duty Paid 
 
 dciiscr piiMti, i. c, 1.71 refractive index for D 157.95 216.45 
 
 Case, \Mlli lu.'k ;ni<i kry, for either of above 10.15 13.90 
 
 Nutting Polarisation Photometer Attachment, particularly designed for attachment to the Hilger Wave- 
 lengllj Sjxii luiiii'h'i- wilh I'liiversal Base, as above listed. The combination results in a Spec- 
 troiihodidiiiir i<>[ I 1m \'isilih> spcrtrum accurate as regards wavelength and photometric measure- 
 ment.-^. 'I lie [-id li' is Wi\id<-il iinlh in densities and degrees. The price includes an arrangement 
 on sejKir/ilr si :itiil for prnduciiig two parallel beams of light, by which means, together with an 
 adju.stmcnt on the photometer itself, the correct conditions of illumination may be secured with 
 two columns of liquid of anv desired length. 
 Duty Free " 178.20 Duty Paid 244.20 
 
 Nutting Photometer Attachment, as above but on separate stand with levelling Duty Free Duly Paid 
 
 ficrews, .suitable for use with any ordinary Spectroscope 179.55 246.05 
 
 Stand for Tubes of Absorbing Liquids, such as Baly tubes, etc 14.8.T 20.35 
 
A R THUR H. THOMAS COMPANY 
 
 Spectroscope, Kriiss Universal, f 
 
 Large model with flint g s i 6n t U 
 range of dispersion. Micro \ n ent t 
 
 itative analyais with simple n ete 1 t w 
 
 prism and lamp for illumination of scale, Eq- 
 with micrometer double slit, with two dividet' 
 sorption vessel with parallel walls, Schultz's 
 With twn unsvmmptrical slits. 
 Dut^ Free 157.50 
 
 Spectroscope. Kru--'; Universal, f\i(tU sime as abo 
 Dut\ Free i90.50 
 
 ] analysis, spectro-photuinetry, etc. 
 
 I utherford prism, providing a great 
 1 n telescope, etc. Equipped for qual- 
 
 tl d 11 Irum and platinum edges, comparison 
 uipped for quantitative analysis and photometry 
 I drums after Vierordt, adjustable eye-piece, ab- 
 cell, micrometer support and observation lamp. 
 
 Duty Paid 210.00 
 
 ,-o. but with two symmetrical slits. 
 
 Duty Paid 254.00 
 
 
 AH liillii -' 
 
 m 
 
 
 
 
 fri Ill I""'] 
 
 46936. Spectrograph, Fuess, Gehrke and Reichenheim, as used at ll i 1 If hnisclie ileichsaustait. 
 With optical system of quartz for investigations of the i Iti I hotographic plates 6§ x 
 9 cm. A small compact instrument which has been suj 1 leading chemical and 
 phvsical laboratories in Europe and America. Complete 1 i^e Cornu prism, 
 Duty Free 142.50 Dut\ P-iid 190.00 
 
 46940. Spectrograph, Fuess, identical with above but with glass len e^ in I tw lense flint glass prisms 
 no = ] .75 for investigations of visible spectra. 
 Duty Free 120.00 Duty Paid 160.00 
 
 46944. Spectrograph, Hilger, for the Ultra- Violet, with optical system of Uviol glass. Recommended as an 
 inexpensive outfit for ultra violet work, having been used very successfully for experiments in 
 blood, absorption spectra, etc. Each instrument is sent out in complete adjustment ready for 
 photographs to be taken. Specimen photographs sent on application. With two prisms and 
 lenses of the most transparent ultra-violet glass, the lenses of 8 inch (203 mm) focus, the spec- 
 trum from 300 fxfi to 800 /i/i, about 40 mm in length. Size of plate 4^ by 3i inches. 
 Duty Free 89.10 Duty Paid 122.10 
 
,. I-, rrtr-;''il'liV'F'"' 
 
 X- A- A- 
 
 No. 4li948 
 
 Spectrograph, Hilger, for the Ultra- Violet, SizeC, with quartz optical system; designed to be io permanent 
 adjustment; to give the whole spectrum from 200 /<>i to 800^1,11011 one plate; to give good definition 
 over the whole spectrum on the ordinary photographic plate and to give as large an amount of 
 light as is consistent with the above conditions, thus enabling spectrograms to be taken with 
 relatively' short exposures. The instruments are sent out completely adjusted, ready for photo- 
 graphs to be taken. Specimen photographs will be sent on application. With lenses of 24 inches 
 (610mm) focus, the instrument giving a spectrum from 210 ^iiu to 800 w of about 200ram in length; 
 prism 41 nrni high by 65 mm length of face; size of plate 10 x 4 inches; with No. 2 Slit. The dis- 
 persing system consists of one Cornu prism. There is a vertical motion by rack and pinion to the 
 dark slide, with scale, whereby a number of exposures ran be taken one below the other. 
 
 Duly Free 317.25 Duty Paid 434.75 
 
 Wavelength Scale for above Spectrograph mounted internally in such a manner as to be brought 
 at will in contact with the photographic plate. Tlluraination is provided by means of a small 
 electric lamp, and a contact print of the wavelength scale can thus be obtained on the same 
 plate as, and in juxtaposition to, the photograph of the spectrum. The above Quartz Spectro- 
 graph in connection with the wavelength scale is widely used for experiments in the absorp- 
 tion of light of complex chemical substances and in the study of molecular constitution. 
 If desired the scales can be divided to react frequencies instead of wavelengths, the price being 
 the same. Price applies only if ordered with .Size C Spectrograph, including small battery in 
 case with push key for illuriiinating lamp; the whole being attached to the Spectrograph in a con- 
 venient position for use- 
 Duty Free 70.20 Duty Paid 96.20 
 
 Wavelength Scale on Glass, for above Spectrograph. These scales are photographed on glass and 
 can be laid direct on the spectrograms to read off the wavelengths. They are prepared to 
 suit each individual instrument and are sufficiently accurate to determine the identity of most 
 lines. 
 
 Duty Free 8.10 Duty Paid 11.10 
 
 Metal Slides for the Plate-holder for above Spectrograph, same being attached to the base of 
 the instrument by a rigid metal bracket. In this construction the wooden cone and bellows 
 of the camera are stil! retained, but play no part in the support of any essential portions of the 
 ipf irat 1^ 
 
 Dut\ Free . 94.50 Duty Paid 129.50 
 
 36964. Sector Photometer. Hilger, for Quantitative Spectro- 
 
 */^^\ Photometry in the Ultra-Violet in connection with 
 
 \ 'k f^'l ^^^ Hilger Ultra-Violet Spectrograph Size C. With 
 
 \ '^^i wavelength scale by the measurements of the actual 
 
 IfTj. proportion of each wavelength absorbed in its 
 
 SL jiiftt-::!Lra ^^ passage through the substance or for some function 
 
 [mfew'-^^^Si ~^f^% TJt, of it. as for instance the absorption constant. The 
 
 ' JBr '^^ jHMg BI^ l> Jng great interest which the measurement of selective 
 
 iliiiiiiHiiiMLiiiiiiiiii. ™ "--."^'^W ^^ absorption has assumed for the chemist will be noted 
 
 ■iBiiiliiil iiUlli 1 1 t^ from _ the extensive bibliography concerning the 
 
 chemical significance of the absorption spectra of 
 
 fi'JiSTXi^Pl^l organic compounds and rare earths. Much of this 
 
 il.lBiRlin^*)^Hi work has been unsatisfactory because it has not 
 
 been of a quantitative character. The Sector 
 
 Photometer consists of a slit and a bi-prism which 
 
 receives the light from the solution through the sub- 
 
 . 11 stance to be examined and the rotating sector so 
 
 lllllllllli' that two spectrum photographs are obtained in 
 
 ■llllJlP' ,„ close juxtaposition, one of which is of reduced 
 
 density throughout its whole length and the other 
 
 No. 46964 — that which has passed through the material 
 
 under test — being more dense that the first in certain parts and less so in others, there being 
 
 certain wavelengths where the density of the two is equal. Spectrum photographs and more 
 
 romple1<; desiTii>tion, with complete bibliography, will be sent upon application. With motor 
 
 for either 110 or 220 volt circuit. Voltage must be specified in ordering. 
 
 Duty Free 145.80 Duty Paid 199.80 
 
 Tubes, with quartz ends, for solutions, length of liquid 10, 20 or 40 nun. 
 
 Duty Free, each 4.05 Dutv Paid, each 5.55 
 
ARTHUR 
 
 THOMAS COMPANY 
 
 
 M 
 
 SPECTROSCOPE, GRATING, ZEISS, primarily designed for the analysis of absorption spectra but applicable 
 at the same time to the study of emission spectra. In grating spectra the wavelength for any line of the 
 spectrum is proportional to the corresponding angle of deflection, and this property has been made a 
 means of dividing the head of the micrometer screw by which the telescope is moved through the spec- 
 trum in terms of wavelengths. Using none but the most perfect gratings, Zeiss have been enabled by 
 the excellent definition of the spectra to depart from the usual division in terms of Mj" or millionths 
 of a millimeter and have divided the drum into units which are ten times finer, i.e. into Angstrom units 
 (1 A. = 0.1 nij). The Fraunhofer lines of the solar spectrum can accordingly be set accurately to within 
 1-2 A. For sharply focusing the spectrum with respect to the cross lines in the telescope the collimator 
 is very rigidly mounted and fitted for this purpose \vi(-|i 3 milled ring. The slit, which is of the highest 
 order of precision, moves symmetrically and can li i! i i I 'hiring observations by means of a wheel 
 
 and cord transmission gear. The jaws of the slit -^ tram the access of dust and accidental 
 
 injury by a detachable glazed cap, the latter hem^ inii j. lKiiij;cable with a similar cap fitted with a 
 comparison prism. Each division of the slit drum, which has one hundred divisions, changes the 
 width of the slit by an amount equal to 0.01 mm. 
 
 When the instrument is applied to the analysis of absorption spectra the absorption bands are 
 much more clearly defined owing to the comparatively small dispersion of the grating, which contributes 
 greatly to the accuracy with which it can be adjusted with respect to the cross lines. This renders the 
 instrument particularly well adapted for the spectroscopic analysis of pigments by Formdnek's method. 
 To render the cross lines clearly visible in the presence of very dark absorption bands the telescope is 
 fitted with a convenient device for illuminating the cross lines, which entirely fulfils the purpose of the 
 arrangement recommended by Formanek, though it differs from it in the means adopted by Zeiss. 
 
 The most suitable source of light is a Nernst lamp with exposed glower, i.e. a glower not sur- 
 rounded by a heating spiral, an image of the glower in its natural size being projected upon the slit by 
 means of a condenser lens. With this source of light the slit should as a rule be reduced to a width of 
 0.02 to 0.03 mm. An inverted incandescent gas burner supported on a stand and provided with screen 
 is equally convenient to manipulate, though it gives a less intense light than the Nernst lamp. 
 
 Spark spectra and arc spectra are examined by projecting with the aid of a converging lens an 
 image of the radiant upon the jaws of the slit, which for this purpose are lacquered white. Care should 
 be taken to insure that the exit pupil of the telescope may be completely filled with light. This may 
 be ascertained by viewing the small bright circle in front of the eyepiece with a magnifier. Seei^. Lowe. 
 Zeitschr. f. Instrumentenkunde 1908, 28 S. 26i; or J Formd'tek "Uiiler sue hung und Nackweis organischer 
 Farhstoffe auf spectroskopischem Weqe," II Auflage, Berlin 1908, or "Die qualitative Spektralanalyze 
 nnorrianif^cher und organisher Korper" II Auflage. 
 46970. Grating Spectroscope, as above, with transmission grating, protecting cap for the slit, comparieon 
 
 prism, reader for the micrometer screw and two interchangeable eyepieces of different foci, in 
 
 case with lock and key. 
 
 Duty Free 200.00 Duty Paid 272.00 
 

 ?^ i, — s 
 
 /7.'nuf.Gn 
 
 l^yiB^ilijj 
 
 lji|£jg~^'» « 
 
 Monochromator, for Visible Rays, Fuess. Convenient as a source of homogeneous light for 
 spectrometers, refractometers, polariseopes, microscopes, goniometers, etc. Illustration shows 
 same in position before the collimator tube of a spectrometer. With two flint prisms no = 1.67, 
 and with two Ramsden oculars with cross hairs. See E. A. Wulfing, Tschermak's Mineral u. 
 peirogr. MUL, 15. S. 7h; ferner: C. Leiss, Zeilschr. f. Inslr. Kuiide. 18, S. 209; ferner: C. Leiss, 
 Die opt. Imir.,S. 25, Fig. 19-21. 
 Duty Free 162.90 Duty Paid 217.20 
 
 Spectroscope, Autocollimation, Zeiss. Light reaches one-half of the slit through the window at F, 
 while a similar window on the left admits light to the other half of the slit, and thence passes 
 through the objective O to the prism P, where it is reflected back from one of the silvered faces 
 and in the focal plane of the objective produces a spectrum which can be passed through the 
 field of view of the fixed telescope by turning the screw head M. The arrangement of the two 
 windows furnished a convenient means of comparing two spectra. Wavelengths can be accurately 
 measured within a fraction of a nn by reference to spectrum lines of known wavelengths, while 
 for the identification of the various regions of the spectrum a dispersion curve is furnished with 
 the double Rutherford prism. With double Rutherford prism and dispersion curve. 
 
 Duty Free 185.00 Duty Paid 251.60 
 
 Prism of -30", on silvered back with metal stage, for use interchangeably with Rutherford prism. 
 Duty Free 8.25 Duty Paid " 11.22 
 
 4fi982. 
 
 469K4. 
 
 46988. 
 46990. 
 46992. 
 
 Spectrograph with Divided Circle, Zeiss, 
 
 consisting of the Autocollimation Spec- 
 troscope above, with metal camera with 
 arrangement for ten exposures on one 
 plate and a base plate for the prism for 
 :iutomatically obtaining the minimum 
 deviation. The objectives are inserted 
 as far as they will go by which means the 
 ypectrograph is focused and ready for 
 exposure. With a 6 x 9 cm plate holder, 
 No i( iifi but without objectives and prisms. 
 
 Duty Free.. 206.25 Duty Paid.. 280.50 
 Pair of Achromatic Obiective';, f = 250 mm, with fittings to slide into the collimator and camera. 
 
 Duty Free 15.00 Duty Paid 20.40 
 
 Pair of Double Quartz-Fluorite Achromatic Objectives, f = 250 mm, for use in the ultra-violet. 
 
 Duty Free 47.50 Duty Paid 64.60 
 
 Rutherford Prism, on base plate. Duty Free 25.00 Duty Paid. .34.00 
 
 Cornu Double Prism, on base plate. Duty Free 22.50 Duty Paid 30.60 
 
 Condenser, with quartz lens, on stand. Duty Free 18.7.^ Duty Paid 25.50 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 Monochromatic Illuminator, for the Ultra-Violet Light and Visible Rays, Hilger, reading from 200;^^ '•o 
 700/^11 in direct wavelengths. This instrument is particularly suitabh^ for experiments on the 
 photo electric effect, etc. The collimator and telescope both have symmetrical slits with 
 divided drum heads for width adjustment of the jaws which have an effective length of 20 mm. 
 The lenses are of 31 mm aperture and 210 mm focal length for X= 300;U)n. The beam of light 
 from the collimator passes at minimum angle through a Cornu prism of quartz (height 32 mm, 
 length of face 42 mm) and is then reflected from a plane mirror into the telescope. The prism 
 and mirror stand on one table, which is rotated by means of a tine steel screw, the wavelength 
 of the portion of the spectrum under observation being read off direct on a helical drum. The 
 average accuracy of reading throughout the range is to about liift. The collimator and telescope 
 are rigidly fixed to the cast-iron base. 
 Duty Free 279.18 Duty Paid 382.58 
 
 Note — This inatrument may be converted into a spectrometer for infra-red rays by the addition of rockaalt prism, two nickel-ateel 
 concave mirrors, thermopile, etc. Price upon application. 
 
 Spectroscope, Comparison, Zeiss, for the convenient comparison of the absorption spectra of fluids, 
 glasses, ray filters, etc. In case with a number of lithographs of wave length scale for guidance 
 in observations. The illustration shows the optical arrangement only, the whole being mount- 
 ed on an adjustable upright support with base, for convenient manipulation. 
 Duty Free 77.50 Duty Paid 105.40 
 
 Spectroscope, Comparison. Zeiss, with triple field, i.e. for the simultaneous observation of three spec- 
 tra. Similar in construction to the preceding. This instrument is intended for practical color 
 analysis in the arts, such as three color photography, three color printing and also physiologi- 
 cal investigations on color sensations, etc. I or more dctaled description send for Mess 260. 
 In case with lock and key. 
 Duty Free 93.75 Duty Paid 
 
 Cylindrical Absorption Cells, for use with either of above with cover 
 1 mm, 5 mm, 10 mm and 20 mm. 
 Duty Free, per set 3.00 
 
 Absorption Cell, for variable fluid height 
 
 Duty Free 8.75 
 
 127.50 
 
 glasses, with height of fluid 
 
 Hand Spectrophotometer. Nutting, "Model I, a combination of direct \-ision pocket spectroscope with 
 polariseope consist mg of two Nicol prisms. Dispersion of Amici prism C — 1'' = ca. 5°, See P. G. 
 Nutting, BnUelui ot I'. S Bunuu of Standards, Vol. t. No. i, p. 317, Fig. I u. S, 1906; ferner: C. 
 Leiss, Ze>t^>hr I In^^lr Km.dc B6, S. 307, 1906. 
 Duty Free . . . 27.00 Duty Paid 36.00 
 
ARTHUR H. THO MAS COMPANY 
 
 
 fSi^lf 
 
 470 1 f>. 
 47020. 
 
 47024. 
 47028. 
 47032. 
 47036. 
 
 47040. 
 
 Spectroscope Accessories. 
 Spectrum Burner, Beckmann. A simple and practical method for coloring a Bunsen Hame by means 
 
 of chemical vapors. See ZeiiHchriJt fur angewandte Ckemie, XX Jahrgang 1907, Htft 14, Seite 
 
 564- Complete with stand and porcelain dish 4.00 
 
 Spectrum Burner, Riesenfeld, A new, low priced burner for producing vapors from chemical solu- 
 
 IIOILS fur r.olnritii^^p'.Tlral fl.niM^s 3.00 
 
 Spectrum Burner, Kicsenfeld and Wohlers for electrolytic vaporizing 6.00 
 
 "' Lamp. Riesenfeld, fur spark spectra. By means of an iridium electrode a pure spectrum of 
 
 the metal containing solution to be inve.stigated is secured without the presence of air lines or 
 
 of iridium lines. Price does not include iridium electrode which is supplied at the market price. 
 
 Duty Free 22.50 Duty Paid 31.50 
 
 Mercury Vapor Lamp. Lummer-Straubel, for 25 to 30 volts direct curnmt. 
 
 Duty Free 6.00 Duty Paid 8.00 
 
 Stand and Cooling Bath, fur abuve. 
 
 Duty Free 10.25 Duty Paid 15.50 
 
 Mercury Vapor Lamp, Lummer-Straubel, with quartz window on tube fur the ultra violet. 
 
 Duty Free 9.25 Duty Paid 13.65 
 
 Cooling Cell, for use with above, of dark glass, with quartz window hard rubber tup, etc 
 
 Duty Free 6.50 Duty Paid 9.75 
 
 Mercury Vapor Lamp, Immersion Type of Uviol Glass, on stand with resistance for 111) or 220 volt 
 
 circuit. Current, volts 110 220 
 
 Duty Free 30.50 33.50 
 
 Duty Paid 43.50 47.50 
 
 Extra Uviol Lamp, only for above. 
 
 Duty Free 8.00 Duty Paid 13.50 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 47048. Mercury Vapor Lamp, Perot-Fabry, with protecting cylind tl 12 c to 
 
 take Ray Filters, etc. The lamp is provided with a cool g r Inl arms of 
 
 blackened brass and copper. The entire lamp is mounted o w tl le ell ug 
 
 screws and the whole makes a very convenient source of 1 gl t f to ope and 
 
 other laboratory purposes where a monochromatic beam of 1 o n 1 ^ 1 b e 1 
 
 Duty Free 21.00 Dutj Paid >8 00 
 
 MERCURY VAPOR ARC LAMP OF QUARTZ, HERAEUS. On 220 vol 1 ne lei i lei urned a all 
 
 potentials between the electrodes from 25 to 185 volts by means of a variable resistance of 55 or 95 ohms 
 (depending on the type of lamp) connected in series; on 110 volt lines at all potentials from 25 to 80 by 
 means of a variable resistance of 25 or 40 ohms. If the lamp is not required to burn at low voltages 
 resistances of 30 or 50 ohms and of 12 or 20 ohms are sufficient. The specific intensity of the visible 
 and ultra-violet radiation is the same, and the economy equally as good in 110 volt as in 220 volt 
 lamps. The mercury vapor arc is extremely rich in ultra-violet rays and quartz glass is transparent 
 for such rays above 185 li/j. wave-length. See article in the "Annalen der Physik," 4lh Series, Vol. 20, 
 1906, by Dr. R. Kiich and T. Relschinsky on Pholometric and spectro-pkotometric measuremenis i?i. the 
 high pressure mercury vapor lamp. 
 For 220 volts, direct current, 12 cm arc. S-^- amp. current consumption and 3000 c. p. 
 
 Lamp, complete on stand 145.00 
 
 Rheostat, adjustable series, large, 55 ohms 15.00 
 
 " " " small, 30 ohms 10.65 
 
 2 amp. current consumption and 1500 c. p. 
 
 Lamp, complete on stand 125.00 
 
 Rheostat, adjustable series, large, 95 ohms 10.65 
 
 " " " small, 50 ohms 8.50 
 
 For 110 volts, direct current, 7 cm arc. 3§ amp. current consumption and 1500 c. p. 
 
 Lamp, complete on stand 125.00 
 
 Rheostat, adjustable series, large, 25 ohms 10.65 
 
 " " small, 12 ohms 8.50 
 
 2 amp. current consumption and 800 c. p. 
 
 Lamp, complete on stand 105.00 
 
 Rheostat, adjustable series, large, 40 ohms 6.15 
 
 " " " small, 20 ohms 6.15 
 
 Note — These are direct current Lamps and cannot be run with alternating current. Because of the 
 extremely fragile nature of these Lamps packing is charged extra at cost and while it is 
 carried out with the greatest care, Lamps are shipped at buyer's risk only. They can be spe- 
 cially insured against breakage in transportation at the following rates: — 
 
 1000 miles, or under 4.00 
 
 1000 to 2000 miles 6.00 
 
 Over 2000 miles 8.00 
 
 Ray Filters, Wratten & Wainwright, Set of Eight for Spectroscopy, consisting of filters for removing of 
 ultra-violet, transmission of only red, etc. Cemented in glass, 2 inches square, in case. 
 
 Duty Free 7.45 Duty Paid 10.05 
 
 Ray Filters, Wratten & Wainwright, Complete Set of Fifty-one, in mahogany ease. Filters 2 inches 
 square, cemented between optical glass of good quality, containing all the filters required for 
 contrast, photomicrographv or spectroscopy. 
 Duty Free ". '. . 67.50 Duty Paid 91.15 
 
 47052, 
 47056. 
 47060 
 
 47068. 
 47072. 
 
 47076. 
 47080. 
 47084. 
 
 47092 
 47096 
 
 47100. 
 
 47104. 
 
ip§r 
 
 I. 
 
 47I0S. Prism, Hollow, with faces of highly polished mirror glass and glass stopper; cemented together in an 
 electric furnace and resistant to heat, acids and alkalies; with transparent opening through facea 
 25 mm in diameter 6.00 
 
 47112. Spectrum Cells, for absorption spectra, etc., bottle form, with ground in stopper and plane parallel 
 sides ^^ 
 
 471 i(>. Spectrum Cells, for absorption spectra, etc., largest size being suitable for lantern experiments. 
 
 Inside dimensions, mm 30x20x5 TO x 20 x 10 100x80x8 
 
 Each 1.15 1.50 2.70 
 
 47120. Spectrum Cells, for absorption, with round opening 20 mm in diameter by4 mm deep I-OO 
 
 47124. " " with lid (■emented on and with asmall ground in stopper, 40 x40 X 10 mm .,..,, 4.00 
 
 47125. Spectroscope Prisms. Hilger, GO' Angle, accurate to within 10', with rectangular faces and with the 
 
 ratio of the U^ntitli of surface becoming greater in proportion to the height as the refractive 
 index increases, thus securing a more satisfactory and effective aperture. 
 
 Refractive 
 
 index 
 
 32 
 
 42 
 
 ">1 
 
 t;o 
 
 Light Flint 
 
 forD = 1.58tol.62{uppro^iir 
 
 Height of prism P 
 
 ately) 
 
 Denae Fli 
 
 Refractive index for D = 1.6.3 tt 
 
 1.155 (approKim ately) 
 
 Length of fa 
 
 Length of face 
 
 11 i 35 
 U 44 
 2^ 54 
 2', G4 
 
 Height of prism 
 
 Price 
 
 inches 
 
 u 
 
 Is 
 
 iiwlL^a mm Duty Free 
 
 1 1 25 6.53 
 
 1 U 32 8.91 
 
 1 i :i.S 12.62 
 
 r; 44 17.82 
 
 Duly Paid 
 
 8.95 
 12.21 
 17.29 
 24.42 
 
 inches mm 
 
 . U 3S 
 If 44 
 
 Duly Free ' Duly Paid 
 
 8.91 12.21 
 10.09 13.83 
 14.25 19.53 
 19.89 27.26 
 
 Spectroscope Prisms. Hilger Right-Angle, of white, cirar and thoroughly annealed crown glass, with 
 guaranteed definition and angles accurate to within 5'. 
 
 Length of square cathetus surface, mm 10 15 20 25 30 
 
 Each, Duty Free ~4775 7T43 10.40 13.36 16.34 
 
 Each. Duty Paid 6.51 10.18 14.25 18.32 22.40 
 
 Quartz Prisms, Cornu, refracting angle of 60°, composed of two prisms of right and left rotation 
 quartz, respectively, each of 30' angle. This improved construction results in greater optical 
 perfection, removal of double image caused by reflection between the two inside surfaces without 
 the necessity of any liquid between the two surfaces, a gain in light transmitted and greater con- 
 venience in handling. 
 
 irfeight of prism 19 ram 32 mm 42 mm 
 
 T-ength of external faces 25 mm 25 nmi 32_mm 
 
 Duty Free 20.79 28.51 48.13 
 
 Duty Paid 28.49 39.07 65.95 
 
 Quartz Lenses, unmounted, accurately cut with the crystallographic and optical axes coincidejat; of 
 
 the finest definition, the focal length fo; 
 diameter. 
 
 Clear aperture, mm 25.4 32 
 
 Duty Free " U.88 13.37 
 
 Duty Paid 16.28 18.32 
 
 Quartz Lenses, plano-c 
 Diameter, inches 
 
 elength 400 ^y being not less tlian ten times the 
 
 38 44 51 57 
 
 15.44 17.82 21.98 29.70 
 
 21.16 24.42 30.12 40.70 
 
 ex, second qualitv, suitable for condensing lenses, etc. 
 
 1| 
 
 64 
 40.10 
 54.40 
 
 2i 
 
 61 
 
 18.71 
 
 25.64 
 
 Focal length, inches 3 3| 4j _ ^* ^ 
 
 Duty Free 4.4G 5.80 7.13 8.91 13.07 
 
 Duty Paid 6.10 7.94 9.77 12.21 17.91 
 
 Rocksalt, Prism, 60° length of face 32 mm, height of face 25 mm. 
 
 Duty Free 20.52 Duty Paid 28.11 
 
 Rocksalt, Lenses, with second quality surfaces, focal length for D not less than five times the diameter. 
 
 Diameter 25 mm 31 mm 38 mm 44 mm 
 
 Duty Free 5.64 6.24 7.13 8.32 
 
 Duty Paid 7.73 8.55 9.77 11 .40 
 
 Note — I'"irst qii;i1i( y T.nises of Rocksalt, focal length for D not less than 1th the diameter, curves guch 
 as tn i;ivc iiiiriiiiiuni spherical aberration for wavelength 10 ^i, price 2^ times that of above. 
 
 Gratings. Replica, miulc from Rowland originals, each in case. 
 
 Xumbci- of lines " 15,000 14,438 15,000 
 
 Size, inches If x Iv Irjr x -J 4\ x If 
 
 Each 6.00 5.00 11.00 
 
No. 47172 
 
 47160. Spectrum Tubes, Plucker. with .simple electrodes. Filled with either 0, H, NO, CO, COa, CI, Cy, 
 < 'li ,, I or Br. K<a(.'h 2.00 
 
 471(i4. Spectrum Tubes, Plucker, with simple electrodes. Filled with either Helium or Argon at f to 5 mm 
 |>ressurc. Each 5.00 
 
 471G8. Spectrum Tubes, Plucker, empty, with siraijle electrodes and two Jena stopcocks ground absolutely- 
 tight, for filling in the labnnitory with ;i,ny desired gas. Each 3.00 
 
 47172. Spectrum Tubes, Dorn-Goetze, with ^:qii:irc rut end of capillary ad u=!ed for observation of anode and 
 cathode ray, with cylinder electrodes of large capacity. Particularly recommended for the in- 
 vestigation of rare gases. Filled with either O, H, N, NO, N^O, NOs, NH3, H^O, ordinary air 
 CO. CO2, SO,, Br, CI, Si FK Sn CI4, H^S, Cy, HCy, C.Hj, C^H,, CH4, CS^ or with solids I, G, 
 Re, HgorHgsG. 
 Duty Free, each 2.75 Duty Paid, each 4.15 
 
 47176. Spectrum Tubes, same as No. 47172 but filled with following rare gases. 
 ,.■., J ... Argon Argon 
 
 r liled, Witll , . , Helium at low pressure at high preJisiire Neon Krrplan Xenon 
 
 Duty Free ^4.50"^ 430 " 8^00 6.00 20.00 27.00 
 
 Duty Paid 6.75 6.75 12.00 9.00 30.00 35.00 
 
 47180. Spectrum Tubes, same as No. 47172, empty, with two stopcocks, for filling in the laboratory.. . . .^.75 
 47184. Spectrum Tubes, Dorn-Goetze, exactly same as No. 47172 but made of Uviol glass transparent to the 
 
 ultra-violet up to 2,">30 A. E., and filled with the same gases or material as No. 47172. 
 
 Dutv Free, each 3.75 Duty Paid, each 5.75 
 
 47188. Spectrum Tubes, same as No. 47184 but filled with the following rare gases. 
 
 v-i, 1 .., Argon Argon 
 
 i'lllea With. Helium at low pressure at high pressure Neon Krypton ?_^il?5 
 
 Dutv Free " .5T5O 5^50 9.00 7.00 21.50 25.00 
 
 Dutv Paid 8.25 8.25 13..50 10..50 .32.00 37.00 
 
 47192. Spectrum Tubes, same as No, 471S4, empty, with two stopcocks for lllling in the laboratory 5.25 
 
 tp^ 
 
 o 
 
 47196. 
 
 47200. 
 
 47204. 
 47208. 
 
 Spectrum Absorption Tube, Baly, consisting of two tubes with polished quartz ends, the outside tube 
 
 being graduated in mm. Complete with two quartz plates and rubber tubing 7.50 
 
 Spectrum Tube, End-on Type for experimental work, with stopcock and condenser to concentrate the 
 
 beam. The spherical portion of the condenser is fitted air-tight to the ground and polished 
 
 cup at the end of the vacuum tube; with glass condenser. 
 
 Duty Free 13.52 Duty Paid 18. .52 
 
 Spectrum Tube, same as above, with quartz condenser. 
 
 Duty Free 22.43 Duty Paid 30.73 
 
 Spectrum Tube, Pure Fused Silica, End-on Type, for ultra-violet work, with secure mercury seals. 
 
 Unfilled, with tube for exhaustion. 
 
 Duty Free 15.60 Duty Paid 21.37 
 
 Spectrum Tube, Pure Fused Silica, with external electrodes, which, while they do not give as brilliant 
 
 a discharge as the usual form, have the advantage of absolute permanence. Unsealed, for ex- 
 perimental purposes, with tube for exhaust. 
 
 Duty Free 5.35 Duty Paid 7.33 
 
 Spectrum Tube, with ground stopper and stopcock, for Dupre's test fnr mercury in gun-cotton. 
 
 Duty Free 3.38 Duty Paid 4.63 
 
f-^illlllilil^Siiii^^. 
 
 47220. Spectrum Tube Holder lor Pluckci- tubes, without tulies 6.00 
 
 4722^. Spectrum Tube Support Universal witi t o clamps, binding iJo,st, with platinum wire, complete as 
 
 per ill istr tion 1 ut nith ut k\ cctr u tubes, or Bunsen burner 8.00 
 
 47228, Photographic Plates Wratten and \\ainwright, very sensitive, for use in spectrographic work. These 
 
 are s i 1 e ! in tl 
 
 Panchramal c \ tra^violet up to 6800 a. u. 
 
 I na tive than Panchromatic "A," but sensitive 
 
 Wratten M o Panchromatic "A," but of much finer grain a 
 
 Altochrome p 5b00 5. u. 
 
 plate ot fine grain suitable for ultra-violet work. 
 
 Doubt Inijlaiiliin uus 
 
 Grade 
 
 Size 4i x 3J inches, per doz. 
 " 10 X 4 " per doz, 
 " 6x9 cm. per doz . 
 ■' 6i X 9 cm. per doz ... 
 
 Panchromatic 
 "A" 
 
 Panchromatic 
 
 .85 
 2. .50 
 
 Wralte 
 
 Allochro 
 
 .65 
 
 1.65 
 
 .50 
 
 .50 
 
 .50 
 
 .50 
 
 Length, mm 120 
 
 47300. Sponges, for laboratory u.se; $1.50 to $5.00 per lb., depending upon quality. 
 
 47304. Spoon,s, Bone. Length, mm 100 120 150 
 
 Each 12 .15 .25 
 
 47308. Spoons, Bone, with spatula end. Length, mm 100 120 150 
 
 Kach ,15 .20 ,25 
 
 47312. Spoons, Horn, Length, mm 80 100 120 150 180 200 220 240 280 
 
 Each 08 .10 .12 .15 .20 ,25 ,30 .35 ,50 
 
 47316. Spoons, Horn, wit spatula end. Lengthmm 80 100 120 150 ISO 200 220 240 280 
 
 Each 12 ,13 ^15 .18 .25 So" .40^.50 .75 
 
 47320. Spoons, Pure Nickel, with epatula end 
 
 Each 
 
 47324. Spoons, Porcelain, with spatula end. 
 
 Lengtli. liUii 105 120 145 ItjO 200 220 
 
 Each ,14 ,17 ,20 ,25^ ,40" ,45 .80 
 
 47328. Spoons, Heavy Cut Glass, Size Teaspoon Desserlspoon TablcBpoon 
 
 Each ,30 .50 ^ 
 
 47332. Sputum Bottles, A heavy, green glass bottle, 2 inches high and 1 inch in diameter, for mailing sputum 
 
 and other samples inside of mailing tubes as required by the U. S. Post Office Department. 
 
 Widely used in Board of Health work. Without coriis. Per gross 4,00 
 
 47336. Sputum Bottles, same as No, 4733G but with corks to fit tight. Per gross 4.70 
 
 47340, Sputum Dish, for sputum examinations, of black glass, with transparent glass lid, 2^ inches in diameter 
 
 by \\ inches high 25 
 
 47344, Sputum Tray, for sputum anal.ysis, of porcelain, half white and half black 75 
 
 170 
 .30 
 170 
 .30 
 300 
 .75 
 300 
 1,00 
 150 
 .65 
 
 280 
 
47348, Sputum Dish, fur sputum examinations, of glass, with bottoi i di\i i 1 mt tl lee be tions oi e being 
 transparent, one of milk glass and one of black glass On metil fiarac with mirror underneath for 
 reflecting light. 
 
 Duty Free 10.00 Duty Paid 14.50 
 
 47352. Staining Dishes, of glass, for staining specimens on the slide, with loose fitting cover and grooves to 
 keep slides in place. Inside dimensions are 75 x 58 mm so that slides of varying widths may be 
 
 handled 25 
 
 47356. Staining Dishes, Moore, of glass, for staining, dehydrating, etc., consisting of a double dish 100 mm 
 
 in diameter by 30 mm deep, with parallel slots 75 
 
 47360. Staining Dish, of glass, for staining specimens on the slide, consisting of a rectangular glass box with 
 cover, a removable tray and a nickel spring wire holder for lifting tray out of staining solution 
 in box. Will take slides 3x1 inches, 3 x 1| inches and 3x2 inches. Complete with glass dish, 
 
 removable tray and wire holder 1.25 
 
 47364. Glass Dish, only 50 
 
 47368. " Tray, only.. 65 
 
 47372. Nickel Wire, holder only 10 
 
 47376. Staining Dish of glazed porcelain, low form, for 3x1 slides 80 
 
 47380. " " " " " for 3 x 1§ slides 1.15 
 
 47384. Staining Jar, with loose cover and bottom polished; size 85 x 35 x 15 mm 25 
 
 47388, " " Coplin, of heavy glass, with ground on cover, for convenient manipulation of sections 
 
 attached to slides; very economical of reagents; capacity ten 3x1 slides. Each 25 
 
 Per gross 25.00 
 
 47392. Staining Jar, so-called "Naples -Jar," with loose fitting hemispherical cover: size 90 x 3-5 mm 20 
 
 47396. " " same as above but with cork stopper and without cover 15 
 
 47400. Staining Jar, Hellendahl, with eight compartments each of which will take two 3x1 slides at one time 
 
 when placed back to back; very economical of solution, with cover 1.00 
 
 47404. Staining Jar, oval form, with cover, 85 x 43 x 19 mm .30 
 
 47408. " " same size as No. 47404 but rectangular form 30 
 
 47412. ■' Block, of wood, for 6 staining jars, including 6 No. 47408 Jars with lids 2.25 
 
 47416. " " only, without jars 50 
 
 47420. " Rack, of brass, nickel plated, for the convenient handling of slides and also for immersion in 
 a large vessel of staining fluid 90 
 
47424. Stability Test Apparatus, Bergmann, consisting of a copper oil bath with i r 1 I rum I sein & a i with 
 ten hard drawn brass tubes, with reflux condenser; mounted on sheet n stai d Mth ga& burner, 
 but without glass parts as shown in illustration. 
 
 Duty Free 64.50 Duty Paid 77.40 
 
 47428. Stability Test Apparatus, cylindrical, of copper, with hard brazed seams, with 12 tubes, metallic con- 
 denser and tripod but without burner or thermometer. 
 
 Duty Free 31.50 Duty Paid 37 80 
 
 47432. Steam Generator, simple form, of heavy copper, tested to three atmospheres; with valve, cocks and 
 gauge as shown in illustration, 120 mm in diameter by 300 mm long. Very convenient for labo- 
 ratory use. 
 
 Duty Free 25.00 Duty Paid 30.00 
 
 47436. Steam Generator, a small sized steam generator widely used in manufacturing operations, etc., where 
 only a limited quantity of steam is required. Can be fired with gas, gasoline, kerosene, hard coal, 
 charcoal, alcohol or wood. Can be safely operated up to 80 lbs. or more, each boiler being tested 
 to a pressure of 200 lbs. per square inch. Illustration shows the boiler as furnished for hard 
 coal, charcoal or wood. These boilers are of the vertical tubular type and the shell is of wrought 
 iron, lap welded, the upper and lower parts of best gray iron and the outside casing blued steel. 
 In the I and J h. p. sizes the tubes are of brass and in the I5 h. p. of blued steel. The illustration 
 shows the 5 and the 14 h. p. sizes and they are all intended for chimney connection, but stack 
 is included only with the i h. p. size. 
 
 Size Ih. p. i h. p. Ij h. p. 
 
 Each "33750" 54.00 140.00 
 
 47440. Gas Burner for i h. p. size 3 50 
 
 47444. " _ " " h " " \ [.... 5.00 
 
 47448. Gasoline Burner, with tank, for \ h. p. size. , 6.25 
 
 47452. " " without tank, for i h. p. size 18.75 
 
47456. Stirring Apparatus, consisting of pulley only with support for glass rods at different distances and rod 
 to clamp to apparatus support. Very convenient in arranging various stirring apparatus. 1.75 
 
 47460. Stirring Apparatus, Schulze, consisting of pulley with clamp, for single glass rods of various forms. 
 Without clamp or glass stirrer 2.00 
 
 47464. Stirring Rods, of glass, for use with above or other stirring apparatus. 
 
 Style ._ A_ B C D _E 
 
 Each 75 .50 1.25 1.00 ' .60 
 
 47468. Stirring Apparatus, Blair, as used in iron analysis. Complete with stirrers, 6 beakers with covers, 
 asbestos plate, etc., but without motor 17.00 
 
 47472. Stirring Apparatus, for hand or power, on wooden base, with iron supports, including stirring roda 
 and beakers. 
 
 Number of beakers 6 _8 
 
 Each 17.50 20.00 
 
 47476. Stirring Apparatus, similar to above but for attaching by clamps to an apparatus support, without 
 beakers or support, as shown in illustration. 
 
 Number of beakers 4 6 
 
 Each "8.00 " 10.25 
 
 47480. Stirring Apparatus, Fischer, including Rabes water turbine, adjustable clamp, pulley, support, glass 
 rod with vanes and glass jar 12.00 
 
ARTHUR H. THOMAS COMPANY 
 
 47484. Stirring Apparatus, Electric, consisting of motor which can be furnished for cither alternating or 
 direct current, 110 or 220 volts, adjustable arm for holding the stirring rod and rheostat for 
 regulating speed from 50 to 1000 r. p. m. Please specify voltage and current in ordering. . 2.».00 
 
 \j~l lans^ pgsj gMT] ir*3 ^m 
 
 'fi^^ttf''" itt^y^a "Wyt-Sffl a^iyKiM ^^^» ^1^ 
 
 No. J7488 No. i:j'J2 No. ITllli; No. J75U0 No. -J/SoJ No- 4J52S 
 
 No. 47,'50S No. 17512 No. J7.>ln No. 47520 No. 4752-i 
 
 47488. Stopcock, Brass, specially inadi.' fur laboratory purposes, guaranteed oil and air tight, with both 
 
 male and female thread. Bore, inches . 5 ? 
 
 Each ..^0 ^ 
 
 47492. Stopcock, as above with both ends having female thread .50 .65 
 
 47496. " " " " " " " male " ..50 .65 
 
 47500. " " " " one end for tubing and the other with male thread .50 .65 
 
 47504. " " " " " " " " " " " " female " .50 .65 
 
 47508. " " " " both ends for tubing .50 .65 
 
 47512. Connectors, Brass, for making hose connections to above stopcocks, with male thread. 
 
 Bore, inches ^ J 
 
 Each " "^5 A5 
 
 47516. Connectors, as above, for stopcocks, with female thread 15 .15 
 
 47520. " " " _ " " " hydrant " .30 
 
 47524, Stopcock, Brass, nickel plated, with long spout for gas connections; very convenient for laboratory 
 connections as the tubulation for tubing is 2^ inches long tapering from \ inch at the small end 
 to 5 inch at the large end; provided with 12 indentations so that it may be safely used with tub- 
 ing from i to i inch bore 60 
 
 47528. Stopcock, Hard Rubber, for acids, HaS, etc, i inch bore, with tubulations for rubber connections 
 at both ends 1,00 
 
 _j ^_ 
 
 No. 47532 No. 47536 
 
 4753G. 
 
 47340. 
 
 47544. 
 47548. 
 47552. 
 
 47.556. 
 47.560, 
 
 Stopcock, Glass, lampljlown form, ^ 
 
 Bore, mm 
 
 Each 
 
 Stopcock, Glass, as above, but straight. 
 
 Bore, mm 1 2 
 
 Each 
 
 90 
 
 1.10 
 
 1.35 
 
 1.60 
 
 2.00 
 
 3.00 
 
 10 
 5.00 
 
 Stopcock, Glass, lampblown form, straight, but with the inlet and outlet of capillary tubing of 1 mm 
 
 bore and an outside diameter of from 6 to 7 mm 1.00 
 
 Stopcock, Glass, lampblown form, three-way. Bore, mm 2 4 
 
 Each " 1.25 1.50 
 
 Stopcock, Glass, as above, four-way. Bore, mm 2 4 
 
 Each "1.50 " " 1.75 
 
 Stopcock, Glass, as above, three-way, with downward outlet at end of stopper. 
 
 Bore, mm 2 4 
 
 Each 1725 IJS 
 
 Stopcock, Glass, as above, two-way, with plug bored at an angle, 2 mm bore 1.10 
 
 Stopcocks, Glass, heavy molded form, straight. Bore, mm 4 6 8 
 
 Each TlO Os 1.50 
 
 Stopcocks, Glass, heavy molded forio, curved. Bore, mm 4 S 
 
 Each "l.lO 1.25 ITSO 
 
47568. 
 47572. 
 
 47580. 
 475S4. 
 
 47588. 
 
 47592. 
 47596. 
 47600. 
 
 Stopcock, Glass, with capillary tubing with 1 mm bore 1.40 
 
 Stopcock, Glass, three-way, with downward outlet at end of stopin^-. Hore, iinn . ... 2 4 
 
 Each 1.5(1 2.25 
 
 Stopcock, Glass, with stopper with two oblique holes and two outlets on one side. Bore, mm 2 4 
 
 Each 1.50 2.40 
 
 Stopcock, Glass, same as No. 47576 but with capillary tubing of 1 mm bore 1.75 
 
 " Glass, two way, with plug bored at an angle and with mercury seal. Bore, mm 2 4 
 
 Each " 2.35" 3.00 
 
 " Glass, same as above but three way with two outlets on one side. 
 
 Bore, mm 2 4 
 
 Each 3.00 4.00 
 
 Stopcock. Glass, straight, light weight for making burette tips, etc.; with inlet tube of 4 mm bore 
 
 and outlet tube of 2 mm bore 75 
 
 Stopcock, Glass, angle form, for burette tips, etc. ; with inlet tube of 5 mm bore and outlet tube of 2 mm 
 
 bore 90 
 
 Grease, suitable for use with above stopcocks, Per stick. 
 
 .25 
 
 47604. Stopclock, Center Seconds, a convenient substitute for the stopwatch for timing laboratory experiments; 
 furnished with an indicator hand to show the point of starting 7.50 
 
 47608. Stopwatch, ordinary quality, similar in appearance to No, 47612; as used in timing various labora- 
 tory experiments, particularly measurements of viscosity, etc., reading in ^th seconds 6.50 
 
 47612. Stopwatch, Jaquet, Anti-Magnetic, absolutely guaranteed. In solid nickel case; recommended as a 
 thoroughly satisfactory watch for laboratory purpbses 12.00 
 
 47616. Stopwatch, Jaquet, Anti -Magnetic, with double second hand. By the first pressure both second hands 
 are released. At the second pressure the first second hand stops while the other second hand con- 
 tinues until the third pressure. At the fourth pressure both hands return to zero 20.00 
 
 47620. Storage Tanks, of acid-proof stoneware, widely used for distilled water, acids, etc., in laboratories. 
 With symbol lettered on front; with ground in stoneware stopcock but without wooden support 
 shown in illustration. 
 
 Capacity in gallons _ 6j 13_ 26^ 39J 
 
 Each 10^50 18.00" 26.00 40.00 
 
47H24, Storage Tanks, for distilled water, of tin lined copper. These tanks are of stout construction of 16 oz. 
 cold rolled copper, tin lioed throughout, are cylindrical in shape, with a cover at top and tin 
 lined faucet at bottom and with water gauge at the side. The 100 gallon size is reinforced with a 
 heavy iron band around the middle. 
 
 Capacity, gallons 25 50 100 
 
 Each 35.00 4(K0b 50.00 
 
 47628. Straw Rings, plaited, for use as supports for flasks, dishes, beakers, etc. 
 
 Inside diameter, mm __50 75 100 125 150 200 
 
 Each 15 .18 .20 .25 .30 .40 
 
 47632. Suberite Rings, for supporting flasks, dishes, etc. These are superior to straw rings commonly used 
 for this purpose, being neater and more durable. 
 
 Inside, diameter, mm 30 60 90 120 150 180 
 
 Each 25 " .35 .45 .55 .65 ' 775 
 
 47636. Sulphur Apparatus, Dudley, improved form, as used at the present time in the Pennsylvania Railroad 
 laboratories and which eliminates the complicated and delicate bromine holder. Glass parts 
 only 12.00 
 
 47640. Sulphur Apparatus, Meyer, for the determination of carbon in iron and steel by the use of barium 
 hydrate, and the determination of sulphur by the aid of bromine; without stopcock. 
 
 Number of bulbs 6 10 
 
 Each 1.25 L50 
 
 47644. Sulphur Apparatus, Meyer, for the determination of sulphur in iron and steel by the bromine method; 
 with stopcock. 
 
 Number of bulbs 6 10 
 
 Each ' 2.50 2.75 
 
 47648. Sulphur Apparatus, Wiborgh, for the exact colorimetric determination of sulphur in iron. Glass parts, 
 with ring and clamp 6.00 
 
 47652. Standard Color Scale, with percentage table 10.00 
 
 47656. Prepared linen discs treated with cadmium, for use with the above. Per 100 4.00 
 
 47660. Sulphur Apparatus, as used in oil refining, consisting of three glass parts with wooden base 1.75 
 
 47664. Sulphur Photometer, Parr, for indicating the percentage of sulphur in coal, coke, petroleum, etc., by 
 making use of a fused mass secured aa a by-product in combustions with the Parr Calorimeter. 
 The mass is dissolved in water precipitated with barium chloride and the density of the precip- 
 itate estimated by reading the depth of the liquid in the graduated tube at which the light from 
 the flame disappears, which reading shows the percentage of sulphur 35.00 
 
ARTHUR 
 
 THOMAS 
 
 COMPANY 
 
 SUPPORTS 
 
 Medium LarKe Extra Large No. 47672 
 
 No, 47B6S 
 
 Supports, without Fittings, with rectangular ba;sc, of japanned cast iron witli copper plated rod. 
 
 Size Small Medium Large Extra Large 
 
 Size of base, inches 4x6 5x8 5|-x9 6x11 
 
 Height of rod, inches 18 20 24 36 
 
 Diameter of rod, inches ^ f ^ § 
 
 Each ^ .40 ~ .60 1.00 
 
 Support, without Fittings, with rectangular base of japanned cast iron 5x8 inches with rod in center, 
 20 inches high by f inch in diameter .50 
 
 as-: 
 
 ,., 
 
 I 
 
 r^3 
 
 Small 
 47676. 
 
 47680. 
 47684. 
 
 Exira Large 
 
 II witii copper plated rod. 
 
 Mediam Large Eitra Large 
 
 20 26 36 
 
 _A i i_ 
 
 .45 .65 1.00 
 
 Support, without Fitting?, with solid glazed porcelain base 6i x 8'^ inches, with rod of polished brass, 18 
 
 inches high 4.00 
 
 Support, without Fittings, with solid glazed porcelain base 14 x n\ inches with brass rod in center, 24 
 
 inches hi-h 5.00 
 
 Supports, without Fittings, with tripod base, of japanned cast 
 Size Small 
 
 Height of rod, inches. , 18 
 
 Diameter of rod, inches _^ 
 
 Each 30 
 
Mi'dium Large Exlra Lariie No. 47692 
 No 47GSh 
 
 Supports, with Rings, consisting of Supports No. 47668 with rectangular base with Xo. 46072 Rings. 
 
 ^ize Small Medium Large Eilra Large 
 
 Number of rings - 3 4 _^_ _ 
 
 Each .50 .75 1.00 1.50 
 
 Supports, with Rings, consisting of Supports No. 4767G witli tripod base w-ith No. 46072 Rings. 
 
 Size Small Medium Large EitraLarge 
 
 Number of rings 2 :i 4 4 
 
 Each -50 .80 LOS iTso" 
 
 Support, with Rings, consisting of No. 47676 with tripod base, medium size; three extension rings No. 
 40076, Zi inches outside diameter, and three clamp holders No. 2451S large size 1.60 
 
 Support, with Rings, consisting of No. 47680 with rectangular porcelain base with three brass rings 
 with porcelain inset and screw clamp. No. 46080, SO mm diameter 5.50 
 
 Support, with Rings, consisting of No. 47680 with rectangular porcelain base with thr^e brass rings 
 with wooden inset and screw clamp, No. 460S4, 80 mm diameter 5.50 
 
 Support Tables, with iron tripod, brass rod and wooden top, adjustable as to height. 
 
 Height extended, mm 200 300 400 
 
 Diameter of top, mm 70 90 125 
 
 Height closed, mm 120 190 240 
 
 Each 1.50 ^ 1.75 2.00 
 
 Support Tables, of polished wood, adjustable as to height, same sizes as No. 4770S. 
 
 Height extended, mm 200 300 400 
 
 Each 80 1.00 1.25 
 
C O M P A N 
 
 47716. Support Table, of cast iron, with clamp for fasteoing to upright of apparatus sujiport, 5 inches in 
 
 diameter .40 
 
 47720. Support, Schellbach, of hardwood 2.00 
 
 47724. Support, Gay-Lussac, of wood, adjustable in all directions 2.00 
 
 47728. Support, Transmission, with horizontal and vertical shaft and two fixed and three adjustable pulleys. 
 Very convenient in transmitting power from water, hot air, electric or other motors to stirring ■ 
 
 devices, etc., in the laboratory; 37 cm high by IS cm wide 9.00 
 
 477.32. Support, on triangular base, with one clamp No. 24678, particularly suited for conductivity vessels, 
 
 calomel normal electrodes, etc 1.50 
 
 47736. Swimming Cups, Amberg, of porcelain, with perforations, for washing specimens; with cork stopper 
 which floats the cup in the washing fluid. 
 Height, mm 35 
 
 200 
 
 Diameter, mm. 
 
 Each 
 
 Syphons, of glass, plain form 
 
 Length, mm 
 
 Each 2.5 
 
 Syphons, of glass, with suction tube. 
 
 Length, mm _200 
 
 Each ' .35 
 
 S}T)hons, of glass, with suction tube and glass stopcock. 
 
 Length, mm 
 
 Each 
 
 300 
 .25 
 
 500 
 .40 
 
 300 
 
 375 
 
 .500 
 
 750 
 
 .40 
 
 .50 
 
 .65 
 
 1.00 
 
 300 
 
 375 
 
 .500 
 
 750 
 
 1.50 
 
 1.75 
 
 2.25 
 
 2.50 
 
 26 
 
 36 
 
 50 
 
 .65 
 
 50 
 
 1000 
 
 75 
 
 1.00 
 
 50 
 
 1000 
 
 00 
 
 1.30 
 
 50 
 50 
 
 1000 
 3.00 
 
Syringe, Sub-Q Safety, fur b;u;tcriological and serological woi-k. A very satisfiictory glass syringe at 
 low price. With u. piston of black glass and safety device preventing the loosening of the as- 
 bestos packing and the larger sizes have ring handle. The needles are attached by screw thread 
 except in the larger sizes which have a flexible coupling. Price includes leather case and two 
 steel needles. 
 
 Capacity, cc _2 ^ 12 20 50 100 
 
 Each 1.25 1.50 1.75 2.00 2.50 5.00 7.50 
 
 Extra Steel Needles for above.. Per dozen 2.75 
 
 47764. 
 47765. 
 47766. 
 
 477G7. 
 4776S. 
 
 477711, 
 47772 
 
 3.60 
 7.20 
 
 .10 
 
 10.00 
 
 50 
 
 14.00 
 
 Syringe, Roux, for bacteriological and serological work, as used in the Pasteur Institute of Paris; 
 
 original French make; widely in Pasteur treatment and for tuberculin injections in veterinary 
 
 practice. 
 
 Capacity, cc 5 
 
 Syringe, only, without needles or case 2.80 
 
 Syringe in case with two steel needles 6.00 
 
 Extra glass barrels .30 
 
 " pistons 20 
 
 " rubber washers 10 
 
 Needles, for Roux Syringes. 
 
 Length, mm 
 
 Inside diameter 
 
 Steel, each 
 
 Platinum iridium. 
 
 100 
 11.20 
 20.00 
 1.20 
 
 47776. 
 477«0. 
 47784. 
 
 Syringe, Kitchens, for Injecting of Precise Amounts. This syiinge provides a convenient method of 
 washing out the entire dose from the syringe with a normal salt solution without the removal 
 of bulb or syringe barrel or the assistance of another person. The glass parts are made of .lena 
 alkali-free glass which is practically insoluble even during sterilization with the normal salt 
 solution. See Journal of Experimental Medicine, Vol. VIII, No. 5, October 12, 1906. 
 
 Syringe Barrel of Jena alkali-free glass, with rubber connection and needle 25 
 
 Bulb, only, of red rubber, for injecting 60 
 
 Back, Rosenau, for 12 syringes, with glass shelf at bottom. See Bulletin 19, 190i, U. S. Public Health 
 a I'd Marine Hospital Service. 50 
 

 SYRINGE, RECORD, ORIGINAL MAKE. Not to ha confused with many imitations now on the market; with 
 improved conical plunger to expel the last drop. When glass barrels are broken, customers are requested 
 to return to us all the metal parts of the syringe, whereupon we will send a complete new syringe at 
 the prices indicated under the heading "Repair Exchange" in the price list below. This is necessary 
 because each barrel must have its piston individually ground in and because of the difficulty in the 
 use of the special solder used in joining the glass to the metal in these syringes. 
 
 47804. 
 
 Capacity, cc ^ 1 
 
 Graduated in, oc yi^ ,-,',7 
 
 Record Syringe, only, without case 
 
 or needles 2,50 2.50 
 
 Record Syringe, in metal case with 
 
 two steel needles 3.00 3.00 
 
 Record Syringe, in metal case with 
 
 two platinum-iridium 
 
 needles 3.65 3.65 
 
 Repair Exchange 1.60 1.60 
 
 Sizes of needles regularly 
 
 furnished 2 H20'9 H 16 i H 2r) 
 
 Set of 5 Record Syringes, 1 cc, 2 cc, 5 cc, 10 cc and 20 <■ 
 
 1 
 
 3.40 
 1.40 
 
 8.00 
 2.00 
 
 9.25 
 2.40 
 
 20 
 2 
 
 lfi'3 H l& 13 
 
 metal case, w 
 
 25.00 
 
 Directions for Sterilizing Syringes of the Record T>pe. 
 
 Detach piston from barrel before sterilization. Put syringe into cold water and light lamp of sterilizer. 
 After sterilization let syringes become cold before placing them into the cold disinfectant. Do not use any other 
 sterilizers but those with perforated trays. Record syringes should not be sterilized in any other way than by 
 boiling them in water. 
 
SYRINGE, RECORD BRUNEAU Conbtruttion the bame as the regular Record Syringe, with the exception of 
 the removable cap which is made long enough to retain the piston during sterilization, etc., thus obviating 
 the necessity of complete withdrawal. This improvement effects a great saving in time and breakage 
 and insures certainty of aseptic conditions. When glass barrels are broken, customers are^ requested 
 to return to us all the metal parts of the Syringe, whereupon we will send a, complete new Syringe at the 
 prices indicated under the heading "Repair Exchange," in the price list below. This is necessary 
 because each barrel must have its piston individually ground in and because of the difficulty in the use of 
 the special solder used in joining the glass to the metal in these syringes. 
 
 Capacity, cc 1 
 
 4780S. Syringe, only, without case or needles 2.50 
 
 47812, Syringe in metal case with two steel needles 3.00 
 
 47816. Syringe " '' " " " platinum-iridium needles 5.00 
 
 Repair Exchange 1 .40 
 
 Sizes of needles regularly furnished 2 H Hi's 
 
 2 
 
 .5 
 
 10 
 
 20 
 
 3.15 
 
 4.30 
 
 5.10 
 
 5.75 
 
 3.60 
 
 5.00 
 
 6.20 
 
 7.40 
 
 «.00 
 
 8.5C 
 
 10.60 
 
 13.80 
 
 1.80 
 
 2.20 
 
 2.40 
 
 2.80 
 
 1 & 13 
 
 S 1 &4 
 
 S I A4 
 
 SI & 4 
 
 
 _M 
 
 H16 HIS H20 ^'' 
 
 No. 4T824 with parts dismounted 
 
 SYRINGE, REFORM. 7~hc distinctive feature of this syringe is the entire absence of metallic solder of any 
 kind. The glass barrels are ground to fit the metal parts and the syringe may be dismantled for 
 cleaning, or the replacement of the glass barrel and immediately reassembled. As each glass barrel 
 is individually ground to its accompanying piston, it is necessary in ordering new glass barrels to 
 order a piston fitted to each. These are kept in stock as per price list below and ; " ' - ■ ■ 
 fitted piston may be used with any Reform syringe of the same capacity. 
 Capacity, ce 1 2 
 
 47824. Syringe, only without case or needles 2.40 2.85 
 
 47828. Syringe, in metal case with two steel needles 3.20 3.80 
 
 47832. Syringe, " " " " " platinum-iridium needles 5.25 6.20 
 
 47836. Glass Barrel with piston ground in to fit 1.40 1.80 
 
 Sizes of needles regularly furnished 2 H is'a H l & 12 
 
 NEEDLES, FOR THE RECORD, RECORD -BRUNEAU AND REFORM SYRINGES. The letter "S" refers to 
 the needles from the serum group of sizes and "H" refers to the regular hypodermic series. Prices of 
 platinum-iridium needles are subject to market fluctuations. 
 Size 81 S2 S3 S4 Kl H2 H12 H16 H18 H20 
 
 47840. Steel, Needles each 20 .20 .18 .18 .10 .10 .10 JO .10" .10 
 
 " per dozen 2.25 2.25 1.75 1.75 1.00 1.00 1.00 1.00 1.00 1.00 
 
 47844. Platinum-iridium Needles, each .3.35 2.75 1.60 1.65 1.40 1.15 1.15 .65 .60 .60 
 
 w and glass barrel 
 5 10 
 
 with 
 20 
 
 4.40 5.20 
 5.60 6.60 
 9.00 11.00 
 2.20 3.20 
 1&4 S1&4 
 
 6.20 
 8.00 
 14.40 
 4.00 
 
 3144 
 
ARTHUR H. THOMAS COMPANY 
 
 N«. 47S48 1< 
 
 Syringe, Luer, fur buuteriological and serological work; an all glass, aseptic syringe with slip-on needles, t 
 make. Considered by many to be superior to the original French make. 
 
 Capacity, cc 1 5 10 
 
 Graduated in, cc , ,', ,t \ \ 
 
 47848. Luer Syringe, only, without needles or metal case 1.7.5 2.2-5 3.00 
 
 47852. Luer Syringe, with metal case and two steel needles 2.75 3.-50 4.50 
 
 47856. Luer Syringe, with metal case and two platino-iridium needles. 3.75 6.00 7.00 
 
 Needles, only, for Luer Syringes- American make. 
 
 Size 22 G 20 < ; 
 
 Length, inches 1? 15 
 
 47860. Steel Needles, per dozen 2.50 2.50 
 
 47864. Platino-iridium Needles, per dozen 16.00 Ift.OO 
 
 20 
 
 1 
 
 4^50 
 
 6.00 
 
 8.50 
 
 to 22 G 
 
 1* to 1 
 
 3.00 
 
 .St^^^ii. 
 
 No. 47830 N 
 
 Syringe, for injecting in veins and arteries, each with three canulae, with stopcock, nickel plated. 
 
 Capacity, cc _ 50 100 150 200 
 
 Each 3.50 ' 8.25 9.50 11.00 
 
 Syringe, or Aspirator, Record, 100 cc capacity as used by manufacturers of biological products for 
 injecting live bacteria into horses, etc. Complete in case with 3-way cock, 2 connecting tubes 
 with metallic connections for same, 2 long steel canulae, 1 trocar, 1 conical tubulation for direct 
 attachment of the canulae and 1 olive form tubulation 21.60 
 
 Svringe, same as above, with 2 canulae and 3-way cock, but without needles, trocars, tubes or case. 
 
 Capacity, cc 50 100 
 
 Each : - -. 10.00 11.25 
 
 Syringe, Record Universal, for infusions, injections, punctures and aspiration, consisting of a 10 cc 
 Record Syringe with three finger rings, attachable ventilating head, 3-way cock, needle connec- 
 tion, steel needles for serum and other subcutaneous injections, puncture eanula, infusion canulae, 
 tubing with metallic connections, long tube for injections in connection with ventilating head. 
 Complete in case 14.50 
 
 Syringe, Record Universal, same as above but without attachable ventilating head, needle connection, 
 needles, tubes or case 8.00 
 
ARTHUR H. THOMAS COMPANY 
 
 *w 
 
 'T 
 
 'ji 
 
 No. 47912 No. 47916 No. 47920 No. 47924 No. 47932 
 
 .ith foot and spout. 
 
 47900. 
 47904. 
 
 47912. 
 47916. 
 47920. 
 
 30 
 
 50 
 
 100 
 
 .1.5 
 
 .15 
 
 .20 
 
 30 
 
 50 
 
 100 
 
 .40 
 
 .45 
 
 .50 
 
 200 
 
 200 
 
 Test Glasses, for collecting serlimpnt, conical ft 
 
 Capacity, cc 
 
 Each 
 
 Test Glasses, same as above, graduated. 
 
 Capacity, cc 
 
 Each 
 
 Test Glass, cylindrical form, Suydenham Hospital model; height 240 mm, diameter 40 mm, 
 
 180 ec ; with blunt conical bottom 
 
 Test Glass, tall conical form, with blunt bottom, 200 cc capacity, 20 cm high, with spout. . . 
 Test Glasses, lecture table form, with spout. 
 
 Capacity, cc 125_ 
 
 Each "" "";25" 
 
 _300 
 
 i.oo 
 
 capacity 
 
 250 
 .40 
 
 ! in No. 47888; convenient 
 
 50 
 .18 
 
 .12 
 
 20 
 
 100 
 
 1,80 
 
 25 
 
 .45 
 
 60 
 
 30 
 
 Test Glasses, low wide form with broad flattened bottom instead of point 
 
 for cleaning or for crushing crystals with glass rod; with spout. 
 
 t 'apacity, cc 
 
 Each 
 
 Test Tubes, with side neck and lip. 
 
 Length, mm 120 
 
 Each 05 
 
 Test Tubes, with lip and foot. 
 
 Height, mm 100 125 _ l.jO 
 
 Each 07 .08 .10 
 
 Test Tubes, graduated, with lip and foot. 
 
 Capacity, cc 
 
 Graduated in, cc 
 
 Each 
 
 Test Tubes, graduated, with lip, but without foot. 
 
 Capacity cc 5 10 15 
 
 Graduated in, cc ^-^ Jj -t 
 
 Each ^ .30" .35 .40 
 
 Test Tubes, Opaque Fused Silica, heavy wall, with lip. 
 
 Length, inches 4 
 
 JJiameter, inches ,j 
 
 Each 
 
 Test Tubes. Thin Wall, of Jena Fiolax Tubing. These tubes are to be identified by a black longi- 
 tudinal stripe. This glass is easily worked with the blowpipe flame and is not to be confused 
 
 with the hard or combustion tubing. It is practically alkali free and is recommended for use 
 
 wherever the greatest insolubility in water, alkalies and acids is desired, as well as great 
 
 resistance to sudden temperature changes. 
 
 Length, mm 100 
 
 Outside diameter, mm 14 
 
 Each .03 
 
 Per 100 2.00 
 
 Test Tubes, Thick Wall, of Jena Combustion Tubing, containing very little alkali and fairl 
 
 in the blowpipe flame, although as hard to fuse as the best Bohemian potash tubing. 
 
 Length, mm 100 120 140 160 LSO 200 
 
 Outside diameter, mm 12 15 18 20 22 25 
 
 Each .05 An M ^1 lli ^IS 
 
 Per 100 4.00 5.60 7.20 8.80 11.20 14.40 
 
 1.00 1.20 1.45 1.75 2.25 
 
 120 
 16 
 
 2.80 
 
 140 
 18 
 
 160 
 
 .05 
 3.60 
 
 160 
 
 20 
 
 .06 
 
 4.40 
 
 ISO 200 
 22 25 
 
 .07 .09 
 5.S0 7.20 
 ' tractable 
 
ARTHUR H. THOMAS COMPANY 
 
 m 
 
 iiiwi!) 
 
 Nd. 47340 
 
 No. 479i;fi No. 47960 No. 4796* 
 
 150 150 150 200 
 
 16 18 20 25 
 
 1.25 1.55 1.80 2.50 
 
 NOTE:-We do not carry in stock test tubes inado of coinmyi'cial glass tubing because of the crystallizatioa 
 on the surface of this tubing which frequently takes place in laboratory use. The diameters of all test tubea 
 are approximate outside diameters of the tubing. A considerable variation must be allowed for bore in the 
 diameter of the tubing and, in the case of heavy wall test tubes, in the thickness of the wall, because of the 
 unavoidable variation in drawing the tubing. Where test tubea must be furnished of an absolutely uniform 
 diameter and thickness of wall they must be selected from our regular stock and a higher price charged. 
 Prices given per 1000 apply only on orders of at least 1000 or more. All test tubes are neatly packed in 
 cartons of 100 each. 
 47940. Test Tubes, Thin Wall, With Lip, of good German glass, for chemical work. 
 
 Length, mm 100 120 120 120 
 
 Outside diameter, mm 12 13 15 _ IS 
 
 Per 100 .65 .85 1.05 1.25 
 
 Per 1000 5.15 6.60 8.40 JO.OO 10.00 12.35 14.35 31.25 
 
 47944. Test Tubes, "Non-Corrosive," Thin Wall, With Lip, for chemical work. These test tubes are made 
 of a fine resistance glass and are of distinctly superior quality and workmanship, and are guar- 
 anteed to be non-corrosive under all ordinary conditions of use. For test tubes of ordinary 
 quality see our No. 47940. 
 
 Length, mm 75 
 
 Outside diameter, mm ■ H 
 
 Per 100 ".85 
 
 Per 1000 6.80 
 
 Length, mm 150 
 
 Outside diameter, mm IS 
 
 Per 100 11.95 
 
 Per 1000 5.60 
 
 47948. Test Tubes, "Non -Corrosive," Thick Wall, Without Lip, for use as culture tubes in bacteriology. 
 These tubes are guaranteed not to corrode or give off alkali after repeated sterilization in the 
 autoclave at 120°C. They are made of a superior resistance glass of great mechanical strength 
 and will stand an unusual amount of mechanical stress without breaking. They are standard 
 throughout the U. H. and are specified in many important bacteriological laboratories in pref- 
 erence to cheaper tubes. The size 150 x 16 mm is standard for most work. 
 
 Length, mm . 100 100 120 120 120 150 150 150 
 
 r)utside diameter, mm 12 15 13 J6 18 16 18 2^ 
 
 Per 100 1-75 2.10 2.00 2.40 2.60 2.60 2.85 3.50 
 
 Per 1000 13.60 J6.80 16.00 19.20 20.89 20.50 22.80 35.00 
 
 47952. Test Tubes, *'Non-Corrosive," for Serological Work, of medium weight wall, with flat well formed lip; 
 of resistance glass showing a minimum amount of color and of selected sizes suitable for the pur- 
 
 100 
 
 120 
 
 120 
 
 120 
 
 150 
 
 12 
 
 13 
 
 15 
 
 18 
 
 16 
 
 1.10 
 
 1.30 
 
 1..55 
 
 1.65 
 
 1.80 
 
 8.80 
 
 10.40 
 
 12.40 
 
 13.20 
 
 14.40 
 
 150 
 
 150 
 
 200 
 
 200 
 
 250 
 
 20 
 
 25 
 
 20 
 
 25 
 
 25 
 
 2.00 
 
 3.60 
 
 3.00 
 
 4.00 
 
 5.50 
 
 16.00 
 
 28.80 
 
 24.00 
 
 32.00 
 
 44.00 
 
 ]jos(' above indicated. Length, mm 
 Outside diameter, mm. 
 
 50 65 65 65 65 75 75 
 4 6 10 12 6 10 
 
 Per 100 1.00 1.00 1.00 1.25 1.25 1.10 1.25 
 
 4795(>. Test Tubes, of Hardest Bohemian Combustion Tubing, very heavy wall, with slight 
 
 Lenjtth, mm IW 125 150 
 
 DianietfT, mm 16 16 18 
 
 Each 10 
 
 47960. Test Tubes, of Hardest Bohemian Combustion Tubing 
 
 Length, mm. 
 
 Each. 
 
 47964. Test Tubes, 
 
 100 100 
 6 10 
 
 150 
 10 
 
 1.25 1.30 
 
 1.40 
 
 ■"■200 
 25 
 
 250 
 25 
 
 .30 
 
 leavv wall, with slight lip and bulb at bottom. 
 iOO _12^_ 150 180 200 
 
 . . ;i5 48 .20 .25 .3"5 
 
 with bulb near top which tends to prevent boiling over of contents and which enables 
 
 tube to be laid on the table without the contents overflowing. Length, mm 125 150 
 
 Diameter, mm 16 18 
 
 Each. . 
 
 .10 
 
 .12 
 

 No. -17!IS0 No 47')96 No 47984 
 
 47%8. Test Tube Baskets, cylindrical, of heavily galv xnupd niie, lor u-^e ui mcuhatari and btenlizeit,, b 
 
 inches high by 5 inches diameter 50 
 
 47972. Test Tube Basket, similar to above but rectangular, b \ 5 -s. 4 intheti 45 
 
 47976. " " " cylindrical, 10 inches in diameter bv 6 inches high, foi use in medium size luto 
 
 clave No. 20936 1 50 
 
 47980. Test Tube Cleaner, Neisser, for the cleaning of test tubes, particularly culture tubes by means ot 
 
 water and steam; consisting of a rectangular copper box 40 x 16 cm, with 05 lods with springs 
 
 at the top, to prevent the breaking of the test tubes, and outlet for both steam and water. 
 
 Duty Free 27.25 Duty Paid 32.75 
 
 47984. Test Tube Filling Attachment, for measuring out exact quantities of fluid; consists of a separatory 
 
 funnel with two-way stopcock and graduated side tube. Price does not include support and 
 
 ring. 
 
 Capacity, cc 250 500 1000 
 
 Each 2.50 SM 4^0 
 
 47988. Test Tube Support, nickel plated on iron base 6 inches high by 11 inches long; for 10 test tubes 2.00 
 
 47992. " " '• of tinned wire, for 40 test tubes up to 35 mm diameter 50 
 
 4799(>. " " " with double shelf for 90 te.-^t tubes of not over 12 mm outside diameter is 
 
 used m serological worlv entire rirl m \1 inni^is 1 in water bitb 100 
 
 No. 48000 
 
 No. isoi; 
 
 48000. 
 48004. 
 
 48008. 
 
 Test Tube Support, of tinned wire, circular form, holding 40 test tubes of 18 mm diameter 75 
 
 " " " same as No. 48000 but square form 75 
 
 Test Tube Support, of copper, for use in water baths, incubators, sterilizers, etc. ; holes are 23 mm 
 diameter. 
 
 Diameter, inches 5 6 S 10 
 
 Number of holes 14 24 36 4S 
 
 Each T7"5 1.00 ~lT25 ~Jjh 
 
 Test Tube Support, of copper with bottom shelf having flange to receive contents of tube in case 
 of breakage; for use in incubators, sterilizers, etc.; with twelve f inch holes. 
 
 ■Size, inches 3x4x2J 3x4x4§ 
 
 Each rOO 1.25 
 
^ R T H UR H. THOMAS COMPANY 
 
 4S016. 
 
 48020. 
 
 48024. 
 
 48028. 
 
 4S036. 
 
 48040. 
 48044. 
 
 48048. 
 
 48052. 
 
 480.56. 
 
 48060. 
 48064. 
 
 Note— Our 7' est Tube Supports a^e put together with brass pins, and do not (.■onie apart. All 
 
 the bottom deck are full i inch in diameter and ail holos at top are f inch in diameter. 
 Test Tube Support, of be^chwood, oil finish, single row, on turned wood supports. 
 
 Number of holes 
 
 Each 
 
 Test Tube Support, of beeehwood, oil finish, single deck, single row. 
 
 Number of hole.s 
 
 Each 
 
 Test Tube Support, of beechwood, oil finish, with pins in rear, single row, single deck. 
 
 Number of holes 
 
 Each " 
 
 Test Tube Support, of beechwood, oil finish, single deck, duublc row. 
 
 Number holes 
 
 Each 
 
 Test Tube Support, of beechwood, oil finish, single deck, double row, with pins in rear. 
 
 Number of holes 
 
 Each, . 
 
 6 
 
 12 
 
 .20 
 
 .25 
 
 6 
 
 12 
 
 _12 
 .45 
 
 Test Tube Support, of black walnut, oil finish, single deck, double row, 
 
 and with 12 extra large holes; very heavy construction. 
 
 Test Tube Support, of beechwood, oil finish, double deck. 
 
 Number of holes. 
 
 Each. 
 
 'ith 12 heavy pins in reai 
 
 Test Tube Support, of beechwood, 
 Number of holes 
 
 I finish, double deck, with pins in rear. 
 
 Test Tube Support, of beechwood, oil finish, double deck, with two rows on lower deck and 
 
 upper deck. Number of holes _ 12 
 
 Each ~".70 
 
 Test Tube Support, of beechwood, oil finish, double deck, with two rows on lower deck and 
 
 upper deck, with row of pins in rear. Number of tubes 24 
 
 Each 90 
 
 Test Tube Support, consisting of block with 12 drying pins 
 
 " " " for hanging on wall, consisting of board with 18 large and 72 small ping. 
 
 24 
 
 .80 
 
 one on 
 
 J4 
 
 1.00 
 one on 
 
 1.25 
 . .30 
 .. 2..50 
 
ARTHUR H. THOMAS COMPANY 
 
 r<'~'n 
 
 No. 181)80 No. 48068 
 
 4S068. Test Tube Support, Weidanz, of copper, for, use in serological work; tubes aiip[)orle<i so that reac- 
 tion may be readily observed and each hole stamped with number. 
 
 For, tubes (j lO 
 
 Each "X75 3.00 
 
 48072. Test Tube Support, of stamped steel, black enamelled, with 14 holes of 1 inch diameter and with 
 7 pins 40 
 
 4S07fi. Test Tube Support, with spring elip; also convenient for use with centrifuge tubes 25 
 
 48080. " " " " " " with ground glass plate on base for writing .80 
 
 4S084 . Test Tube Support, Woithe, arranged especially for bacteriological and serological work, permitting the 
 entire contents of the tube to remain in sight. The test tubes are held in place by strong spring 
 clips making it possible to hold them at any height. For 24 test tubes; size of support 32| cm 
 long, 74 cm wide and 16 cm high 1.00 
 
 4808S. Test Tube Support, Woithe, similar to above but for IS tubes so arranged that all are visible from 
 either side of the rack, i.e., in alternating series with bottom of racks numbered 1.15 
 
 48092. Test Tube Support, Woithe, similar to above but for 96 tubes and with main support 38^ cm long by 
 19 cm wide by 37 cm high and with separate support carrying each series of 12 tubes quickly de- 
 mountable 7_50 
 
ARTHUR 
 
 THOMAS 
 
 COMPANY 
 
 TESTING APPARATUS FOR PAPER, YARNS, TEXTILES, RUBBER, LEATHER, ETC. 
 
 Paper Tester, Schopper, for testing all kinds of paper as to both tearing strength in grams and 
 as to tensile strength in both millimeters and percentage; for strips 15 x 180 mm. Stretching 
 scale reads from to 27 mm and from to 15'^,'^. With single scale to 30 kilos in 100 gram 
 divisions. 
 Style , Ft"' iiJ-nii pu.vtr With pulley for power driving Wilh hydraulic motor 
 
 Duty Free... 120.4.5 174.90 ~ 150^15 
 
 Duty Paid 146.00 212.00 182.00 
 
 Paper Tester, as abu\ 
 divisions. 
 
 Style 
 
 Duty Free .... 
 Duty Paid. . , 
 
 doul")le scale, to o kilos in 10 gr; 
 
 127.05 
 1.54.00 
 
 ith pulley fur powe 
 181.50 
 220.00 
 
 and to 30 kilos in 100 gram 
 
 156.75 
 190.00 
 
 Cloth and Leather Tester, Schopper, for cloths and woven textiles of all sorts, and for leather, etc. 
 For specimens of from 100 to 400 mm in length and 50 mm in width. With stretch scale 
 reading in both mm and percentage. Operating on the same principle as the paper and yarn 
 testers but specially adapted for the materials above mentioned. As supplied by us to the 
 leather testing laboratories of the U. S. Bureau of Chemistry. With two scales, from to 60 
 kilos in -!ths and to 100 kilos in § kilos. 
 Duty Free 270.60 Duty Paid 328.00 
 
 Cloth and Leather Tester, as above, with two scales, from to 130 kilos in i kilo.s and from to 500 
 
 kilos in single kilos. 
 
 Duty Free 363.00 Duty Paid 440.00 
 
 Note— "Where leather and yarns are to be tested on the same machine a special clamp is provided at 
 
 small extra expense. 
 
ARTHUR H, THOMAS COMPANY 
 
 No. ISPO "^c J'^l J 
 
 Thickness Gauge, for paper testing, auLomatii^ally reading from tu 2 mm in .-^ mm by pointer and 
 in I „'„-|,- mm by vernier. 
 Duty Free 19.80 Duty Paid... 24.00 
 
 Note — The above Gauges are supplied with dial reading in inches aad fractions thereof on special order. 
 
 Paper Tester, Portable, Schopper, quick acting type, for strips 50 x 10 mm; with stretch scale 
 reading in percentages. By means of a table the reading of the tensile strength scale is con- 
 verted into kilo values up to 4 kilos, which is sufficient range for papers of ordinary strength. 
 Price includes special strip cutter and a portable carrying case. Determinations can be made 
 within one minute. 
 Duty Free 47.85 Duty Paid 58.00 
 
 T^jote — ^'fhe above machine is furnished for light papers with a capacity of 1.5 kilos and for heavy 
 paper with a capacity of 15 kilos at the same price. 
 
 Folding Test Machine, Schopper, for determination of the resistance of paper against repeated 
 foldings. Suited for paper of all kinds, i.e., printing, writing, wrapping papers, etc. As fur- 
 nished by us to various departments of the U. S. Government. For papers weighing up to 1.50 
 grams per square meter. 
 Duty Free 165.00 Duty Paid 200.00 
 
 Yarn Tester, Schopper, for testing the tensile strength and stretch of yarns, both plain and twisted, 
 and threads of all kinds. With attachment for carrying copa, bobbins and spools and for testing 
 in lengths of 200 mm. The stretching scale reads in both millimeters and percentage. 
 With tensile strength scale from 
 
 to, kilos 5 10 20 30 50 100 
 
 Duty Free 110.55 115.50 120.45 125.40 148.50 181.50 
 
 Duty Paid 134.00 140.00 146.00 152.00 180.00 220.00 
 
 ji^ote— Any of the above machines can be supplied with an additional tensile strength scale of any 
 specified range at $6.60 duty free and $8.00 duty paid. 
 
ART HUR H. THOMAS COMPANY 
 
 Rubber Testing Machine, Schopper — Dalen — Martens, for testing the elasticity and tensile strength 
 of rubber. The test specimen is of ring shape and is rotated during the experiment, which 
 makes possible the establishment of a numerical expression of the test. The machine is operated 
 by water pressure and requires about 40 lbs. pressure. A recording device for automatically 
 making a diagram of the relation of the load to elongation is provided at extra charge. Strength 
 is indicated in both millimeters and percentage. See "The Influence of the Shape of the Test 
 Body upon the Results of the Strength Test," Communications of the Royal Material Testing 
 Institute of Grosslichterfelde, Vol. 4, 1909. With two scales, to 50 kilos in 100 ^ram clivisiona 
 and to 100 kilos in 200 gram divisions. 
 Duty Free 539.55 Duty Paid 654.00 
 
 Rubber Testing Machine, as above, but with automatic recording device. 
 
 Duty Free 664.95 Duty Paid 806.00 
 
 Test Ring Cutter, for making test specimens for above machine, with three Ivinives. 
 
 Duty Free 125.40 Duty Paid 152.00 
 
ARTHUR H. THOMAS COMPANY 
 
 48140. Paper Strip Cutter, I'm- cu it ing strips for testing of the standanl width of l">rnm and for h'ngthw up to 31 cm, 
 Dutj Free " 11.55 Duty Paid 14.00 
 
 OVEN. CONDITIONING, SCHOPPER. for the deterniniation of moisture in &ilk, wool, cotton, wood pulp, ..-ullu- 
 lose, rags, etc. The balances may be used separately from the oven or in position on to]) of the oven, 
 permitting the weighing to be made while the drying process continues, thus avoiding the absorption 
 of moisture due to the removal of the specimen as necessary in older forms. These new models are 
 very quick in operation because of the large amount of warm air supplied. The ovens are provided 
 with chimney to carry off the products of combustion and do not unduly heat up the room in which 
 they are operated. Size I takes about 200 grama of loose material such as unspun cotton or wool and 
 about 500 grama of yarn, or about 1 kilo of cellulose or wet wood pulp. Size II has a capacity for 
 about twice the amounts given for Size I. Gas, steam or electric heating is recommended in all cases 
 where they are possible although the benzene and gasoline oil heaters may be satisfactorily operated 
 where the other sources of heat are unavailable. 
 4S144. Conditioning Oven, as above, for gas heating Size I Size II 
 
 Duty Free , 132.00 214.50 
 
 Duty Paid 160.00 2G0.00 
 
 48148. Extra for Automatic Temperature Regulator 
 
 Duty Free. . 23.10 29.70 
 
 Duty Paid 28.00 36.00 
 
 4SI52. Extra for Gas Pressure Manometer 
 
 Duty Free 4.95 4.95 
 
 Duty Paid 6.00 6.00 
 
 48156. Conditioning Oven, as above, for benzene heating 
 
 Duty Free 138.60 224.40 
 
 Duty Paid 168.00 272.00 
 
 48160. Conditioning Oven, as above, for petroleum heating 
 
 Duty Free 141.90 
 
 Duty Paid 172.00 
 
 48164. Conditioning Oven, as above, for steam heating 
 
 Duty Free 158.40 247.50 
 
 Duty Paid 192.00 300.00 
 
 48168. Conditioning Oven, as above, for electric heating 
 
 Duty Free 191.40 267.30 
 
 Duty Paid 232.00 324.00 
 
Conditioning Oven, Emerson, for the determination of the moisture content in textile materials, con- 
 sisting of an electrically heated dven automatically maintained at the proper temperature by 
 a thermostat. Arrangement t< im.i.I.' wiiinn i he ..vimi for supporting four removable wire baskets 
 or containers into which i.s ni.i...| il,. in ii-n,,! lo be conditioned. Balances are provided for 
 weighing the material before aii.l 1,1- j ■ >.:i.|ii L.n.iHf^, the latter weighing being made in the oven. 
 A motor driven fan produces an arLiliiial cinulation of heated air through the oven and removes 
 the moist atmosphere, thereby greatly reducing the time for testing. The apparatus is mounted 
 on a wooden base and occupies a floor space of 2| x 4 ft,, with a total height of about 6 ft. The 
 heating device operates on either alternating or direct current but voltage must be stated in 
 ordering ; 350.00 
 
 Balance, Torsion, for determining the exact weight in ounces or grams of a running yard or meter of 
 cloth of any width without calculation or the use of weights. A two inch square sample is cut 
 by means of a special die and the scale brought to balance by means of a slide weight. The 
 
 beam is so graduated that either \ oz, or 5 grams can be read 35.00 
 
 Special Die, to cut 2 inch squares 3.50 
 
 Mallet, 2 lbs. in weight, for use with above die 1.00 
 
 Balance, Torsion, for determining the number of yards per pound of fabric of any width without cal- 
 culation or the use of weights. A three inch square sample is weighed and the position of the 
 
 weight on the beam indicates the number of yards per pound of sample. . , 40.00 
 
 Special Die, to cut 3 inch squares 3-50 
 
 We maintain a reference catalogue file of over seven hundred manufacturers and 
 dealers in Laboratory Apparatus. Where large equipment lists are in preparation we 
 recommend that customers avail themselves of the opportunity we provide for the conveni- 
 ent and undisturbed consultation of these catalogues before lists are Anally prepared for 
 estimates. The use of these catalogues involves no obligation to make purchase of us. 
 
THERMOMETERS 
 
 r- L u -^o Centigrade" X 9 , „, ri .- i -> Fahrenheit" - 
 
 Fahrenheit - ■■-■■— h 32. Centigrade = „ 
 
 Ready Reference Comparison of Centigrade and Fahrenheit Therraoraeter 
 
 Cent." 
 
 Fah.° 
 -40 
 
 Cent." 
 
 Fah." 
 44.6 
 
 Cent." 
 
 38 
 
 Fah.° 
 100,4 
 
 cent.. 
 
 Fah." 
 
 Cent." 
 99 
 
 Fah.° 
 
 210.2 
 
 Cent." 
 
 245 
 
 Fah." 
 
 -40 
 
 7 
 
 69 
 
 156.2 
 
 473 
 
 -35 
 
 -31 
 
 8 
 
 46.4 
 
 39 
 
 102.2 
 
 70 
 
 168.0 
 
 100 
 
 212.0 
 
 260 
 
 482 
 
 -30 
 
 -22 
 
 9 
 
 48.2 
 
 40 
 
 104.0 
 
 71 
 
 159.8 
 
 105 
 
 221.0 
 
 255 
 
 491 
 
 -25 
 
 -13 
 
 10 
 
 50.0 
 
 41 
 
 105.8 
 
 72 
 
 161.6 
 
 no 
 
 230.0 
 
 260 
 
 500 
 
 -20 
 
 -4.0 
 
 11 
 
 51.8 
 
 42 
 
 107.6 
 
 73 
 
 163.4 
 
 115 
 
 239.0 
 
 265 
 
 .509 
 
 -19 
 
 -2.2 
 
 12 
 
 53.6 
 
 43 
 
 109.4 
 
 74 
 
 165.2 
 
 120 
 
 248.0 
 
 270 
 
 518 
 
 -18 
 
 -0.4 
 
 13 
 
 55.4 
 
 44 
 
 111.2 
 
 75 
 
 167.0 
 
 125 
 
 257.0 
 
 275 
 
 527 
 
 -17 
 
 1.4 
 
 14 
 
 57.2 
 
 45 
 
 113.0 
 
 76 
 
 168.8 
 
 130 
 
 266.0 
 
 280 
 
 536 
 
 -16 
 
 3 2 
 
 15 
 
 59.0 
 
 46 
 
 114. S 
 
 77 
 
 170.6 
 
 135 
 
 275.0 
 
 285 
 
 545 
 
 -15 
 
 5.0 
 
 16 
 
 60.8 
 
 47 
 
 116.6 
 
 78 
 
 172.4 
 
 140 
 
 2S4.0 
 
 290 
 
 554 
 
 -14 
 
 6.8 
 
 17 
 
 62.6 
 
 43 
 
 118.4 
 
 79 
 
 174.2 
 
 146 
 
 293.0 
 
 295 
 
 663 
 
 -13 
 
 8.6 
 
 18 
 
 64 4 
 
 49 
 
 120.2 
 
 80 
 
 176.0 
 
 150 
 
 302 
 
 300 
 
 572 
 
 -12 
 
 10.4 
 
 19 
 
 66.2 
 
 50 
 
 122,0 
 
 81 
 
 177.8 
 
 156 
 
 311 
 
 310 
 
 690 
 
 -11 
 
 12.2 
 
 20 
 
 6S.0 
 
 51 
 
 123,8 
 
 82 
 
 179 6 
 
 160 
 
 320 
 
 320 
 
 608 
 
 -10 
 
 14.0 
 
 21 
 
 69.8 
 
 52 
 
 125.6 
 
 83 
 
 181.4 
 
 166 
 
 329 
 
 330 
 
 626 
 
 - 9 
 
 15.8 
 
 22 
 
 71,6 
 
 53 
 
 127.4 
 
 84 
 
 183.2 
 
 170 
 
 338 
 
 340 
 
 644 
 
 - 8 
 
 17.6 
 
 23 
 
 73.4 
 
 64 
 
 129.2 
 
 86 
 
 185.0 
 
 175 
 
 347 
 
 360 
 
 662 
 
 - 7 
 
 19.4 
 
 24 
 
 75.2 
 
 55 
 
 131.0 
 
 86 
 
 186.8 
 
 180 
 
 356 
 
 360 
 
 680 
 
 - 6 
 
 21.2 
 
 25 
 
 77.0 
 
 66 
 
 132.8 
 
 87 
 
 188.6 
 
 185 
 
 365 
 
 .370 
 
 698 
 
 - 5 
 
 23.0 
 
 26 
 
 78.8 
 
 57 
 
 134.6 
 
 88 
 
 190.4 
 
 190 
 
 374 
 
 3-80 
 
 716 
 
 - 4 
 
 24.8 
 
 27 
 
 80.6 
 
 58 
 
 136.4 
 
 89 
 
 192.2 
 
 195 
 
 383 
 
 390 
 
 734 
 
 - 3 
 
 26.6 
 
 28 
 
 82,4 
 
 59 
 
 138.2 
 
 90 
 
 194.0 
 
 200 
 
 392 
 
 400 
 
 752 
 
 - 2 
 
 28.4 
 
 29 
 
 84,2 
 
 60 
 
 140.0 
 
 91 
 
 195.8 
 
 206 
 
 401 
 
 420 
 
 788 
 
 - 1 
 
 30.2 
 
 30 
 
 86.0 
 
 61 
 
 141.8 
 
 92 
 
 197.6 
 
 210 
 
 410 
 
 440 
 
 824 
 
 
 
 32.0 
 
 31 
 
 87.8 
 
 62 
 
 143 6 
 
 93 
 
 199.4 
 
 216 
 
 419 
 
 460 
 
 860 
 
 1 
 
 33.8 
 
 32 
 
 89.6 
 
 63 
 
 145.4 
 
 94 
 
 201.2 
 
 220 
 
 428 
 
 480 
 
 896 
 
 2 
 
 35.6 
 
 33 
 
 91.4 
 
 64 
 
 147.2 
 
 96 
 
 203.0 
 
 225 
 
 437 
 
 500 
 
 932 
 
 3 
 
 37.4 
 
 34 
 
 93.2 
 
 65 
 
 149.0 
 
 96 
 
 204.8 
 
 230 
 
 446 
 
 520 
 
 968 
 
 4 
 
 39.2 
 
 35 
 
 95.0 
 
 66 
 
 150.8 
 
 97 
 
 206.6 
 
 235 
 
 455 
 
 540 
 
 1004 
 
 5 
 
 41.0 
 
 36 
 
 96.8 
 
 67 
 
 152.6 
 
 98 
 
 208.4 
 
 240 
 
 464 
 
 560 
 
 1040 
 
 6 
 
 42.8 
 
 37 
 
 98.6 
 
 68 
 
 154.4 
 
 
 
 
 
 
 
 
 
 
 o^wm 
 
 -|.i„.j-..-, 
 
 |fJir'|'5J|EITTTr|i''TIiTT 
 
 |-,-,-|.,,,;,.,..,,, 
 
 
 ■=aBs»Bmmm 
 
 
 
 Thermometers, with enclosed paper scale, with either Centigrade or Fahrenheit scales, as indicated; 
 
 outside diameter 9 to 10 mm. 
 
 Range 100° C. 150° C. 200° C. 260° C. 300° C. ' 212° F. 300° F. 400° F. 600° F. 
 
 Length, mm 300_ 300 350 350 360 300 300 360 400 
 
 Each .50 .60 .65 .75 .90 ..50 .60 .75 .90 
 
 Thermometers, with enclosed paper scale, witli both Centigrade and Fahrenheit scales, outside 
 
 diameter 9 to 10 mm. 
 
 Range, Centigrade 100° C. 150° C. 200° C. 360° C. 
 
 Fahrenheit 212° F. 300° F. 400° F. 600° F. 
 
 Length, mm 300 300 350 400 
 
 Each SO .90 1.00 1.25 
 
 Thermometers, with enclosed paper scale, short form, with both Centigrade and Fahrenheit scales; 
 
 outside diameter 7 mm. 
 
 Range, Centigrade -10° to +100° C. 100° to 220° C. 
 
 Fahrenheit +14° to +212° F. 212° to 450° F. 
 
 Length, mm 100 120 _ 
 
 Each ' .75 " 1.00 
 
 Nos. 48212 to 4S21G 
 
 Thermometers, with enclosed opal glass scale, wdth capillary of Jena glass; with either Centigrade or 
 
 I'ahrenheit scales, as indicated; outside diameter from 9 to 10 mm. 
 
 Range 100° C. 150° C. 200° 0. 360° C. ' 212° F. 300° F. 400° F. 600° F. 
 
 Length, mm. . . . 300 300 3.60 400 ,, 300 300 350 350_ 
 
 Each 1.10 1.20 1.40 1.80 1.10 1.20 1.40 1.80 ' 
 
 Thermometers, with enclosed opal gla.s3 scale anil capillary of .Tena glass: with both Centigrade and 
 
 Fahrenheit scales; outside diameter 9 to 10 mm. 
 
 Range, Centigrade 100° C. 160° C. 200° C. 360° C. 
 
 Fahrenheit 212° F. 300° F. 400° F. 600° F. 
 
 Length, mm 290_ 300 360 390_ 
 
 Each 1.35" 1.50 1.75" 2.00 
 
E^i^EiEEEIME^^M^^iMWEhM^M^ 
 
 ^^jU^i^SESSam 
 
 Nos. 48220 to 4822^ 
 
 Therm«meters, engraved on stem, with opal glass background and safety reservoir at top of capillary; 
 
 diameter 6 ram; with either Centigrade or Fahrenheit scales as indicated. A widely used lab- 
 oratory thermometer. 
 
 Kange 100° C, 150" C. 200° C. .360*^ C. 212° F. 300° F. 400° F. 600° F. 
 
 Lcntith, mm,,. _300 300 350 400 , 300 300 350 400 
 
 Each 1M~ iTIO L25 L5D 1.00 l.IO 1.2r» 1..50 
 
 4S224. 
 
 Thermometer, engraved on stem, with opal glass background and safety reservoir 
 at top of capillary, diameter G mm; with both Centigrade and Fahrenheit scales. 
 
 Range, Centigrade 100° C. 150° C. 200° C. 360° C. 
 
 Fahrenheit 212= F. 300° F. 400° F. 600° F. 
 
 . Length, mm _300_ 300 .350 400 
 
 Each 1.25 1.50 1.75 2.00 
 
 Thermometers. A. H. T. Co. Special, engraved on stem, with safety reservoir at top 
 of capillary, of .Jena 16 IJI glass; recommended for laboratory work generally 
 where accuracy is required but where the expense of a precision thermometer 
 is not justified. 
 
 Range, Centigrade 0-50° 0-50° 0-100° 0-100° 100-200° 0-200° 100-200° 
 
 Graduated to \° r!!° 5° yV" 1° -'-° A" 
 
 Length, mm 330 3S0 400 _ 600 500 600 600 
 
 Each 3.00 " 3^25 " 3.25 4.00 ~3.50 ~ 4.25 5^00 
 
 Thermometer, Precision, etched on stem, with white background, of Jena 16 m 
 glass. Those reading over 250° C. are filled with nitrogen. In the higher ranges 
 the glass used is the Jena Borosilicate 59 i^. 
 
 Range -10 to -10 to -10 to -10 to -10 to 
 
 + 100° C. +100° C. +100° C. +100° C. +250° C. 
 
 Graduated in. , 1° 5° !-° ^° 1° 
 
 Each, without certificate, , . 2.75 3.50 5.00 9.00 2.75 
 
 Each, with P. T. R. certificate 3.65 4.40 7.25 1 1 ..50 5.75 
 
 Range —10 to —5 to —5 to —5 to —5 to 
 
 +250° C. +360° C. +360° C. +500° C. +550° C, 
 
 Graduated in i° 1° ^° 1° 1° 
 
 Each, without certificate 4.50 5.00 6.50 7.50 ^9.00 
 
 Each, with P. T. R. certificate 7.-50 7.25 8.75 10.85 13.45 
 
 Thermometers, Normal, with enclosed glass scale, constructed in exact accordance 
 with Paragraph 12 of the regulations of the Physikalisch-Technische Reichs- 
 anstalt; capillary is of Jena Normal glass. Thermometers reading from 250° 
 to 400° C. are filled with nitrogen and those reading from above 400° C. to 550° 
 C. with nitrogen at a pressure of 20 atmospheres 
 
 Range -lOto -lOto -lOto -10 to -5 to 
 
 + 100° C, +100° C. +100° C. +100° C, +200° C. 
 
 Graduated in 1° J" +° -jL° 1° 
 
 Each, without certificate 4.50 7.00 10.00 15.00 G.OO 
 
 Each.withP.T.R. certificate 5.40 7.90 12.25 17.50 .S.50 
 
 Range —5 to —5 to —5 to —5 to 
 
 +200° C. +200° C. +360° C. +360° C. 
 
 Graduated in ?° -!° 1° 1" 
 
 Each without certificate 7.50 11.75 9.o7) iXoO 
 
 Each, with P. T. R. certificate , , , , 10.00 15.15 11.25 14.25 
 
 Thermometers, Normal, same ad above but etched on stem and with zero point 
 indicated. 
 
 Range +180 to +550° C. +100 to 550° C. 
 
 Graduated in 1° 5° 
 
 Each, without certificate 11.00 13.50 ' 
 
 Each, with P. T. R. certificate 15.45 17.95 
 
 Note — The above Normal Thermometers are the most accurate thermometers made 
 for scientific work and are only surpassed by the Primary Standard Ther- 
 mometers of the few European makers qualified for such work and which are 
 used in research and are not intended for general laboratory use. These we 
 import from such makers on special order only. 
 
 ( 
 
48244. Thermometers, engraved uii stem, with white background and safety reservoir at top of capiila' 
 nitrogen filled, for high temperature work; with Fahrenheit scale. 
 
 Range 212' 
 
 Graduated in 
 
 Length, inni. ... ..... 
 
 Each , 
 
 to 750° F. 212° to 1000° F- 
 2" 5° 
 
 400 450 ___ 
 
 6.00 8.00 
 
 Thermometers, of Quartz Glass, with opal glass scale. These thermometers have the important advan- 
 tage over all other thermometers that they do not crack by the application of either sudden heat 
 or cold; such a thermometer, for instance, can be plunged directly into molten metal without 
 any danger of its cracking. The temperature reading.^ of a Quartz Olass thermometer, even 
 when used for years, remain always constant because of the extraordinarily low expansion 
 coefficient of quartz glass. These thermometers are about 6 mm in diameter and are graduated 
 in single degrees. 
 
 Range -10 to +400° C, +100 to +400° C, +100 to +450" C. 
 
 Length, cm 20 16 20 
 
 Each 18.00 18.00 ' 20.00 ^ 
 
 Thermometers, of Quartz Glass, with scale engraved on nickel-steel tube and filled with nitrogen above 
 the uiercuiv at a pressure of 50 atmospheres; range from +300° to +750° C. in 5° divisions. 
 
 Duty Free 28.50 Duty Paid 45.00 
 
 Protecting Tube of steel, for above. 
 
 Duty Free , 2.25 Duty Paid 3.00 
 
 Thermometers. Normal. AUihn, with enclosed glass scale, in set of three with ranges of — 15 to +100° C, 
 + 100° to +200° C. and +200° to +300° C. The thermometers are each about 30 cm long and 
 about S mm in diameter, with zero and boiling point correction. In leather case without 
 
 certificate 24.00 
 
 With P. T. R. certificHte ... 32.50 
 
 Thermometers, Normal, Anschulz Mth en I el ^la^ s ik ind small bulbs, as used for fractional 
 distillations. Thermometers No 2 to No 7 intlusi\c are nitrogen filled, and all the thermom- 
 eters of the series are 16 cm long and about G mm in diameter. 
 
 Number No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 No. 7 
 
 Range -10 to +40 to 90 to 150 to 200 to 250 to 300 to 
 
 +60° C. +100° C. 160° C. 220° C. 270° C. 310° C. 360° C. 
 
 Graduated in _ t° 1° t,° 1° l° ^° \° 
 
 Each " 4.50 4.50 4.50 4^0 OTOO 6.00 6.00 
 
 Thermometers, Normal, Anschiitz. Complete set of seven as above described, in leather case.. , 32.50 
 Note — Anschiitz Thermometers as above are supplied with certificate of the Physikalisch-Technische 
 Reichsanstalt on special im))ort order. 
 
48272. Thermometers, for Low Temperatures, etched on stem; as used in liquid air and similar work. The 
 thermometer reading to —100° C. is filled with toluol and that reading to —200° C. with pentane; 
 graduated in single degrees. 
 
 Range ."tL^P^Jo - 100° C. +30" to -200° C. 
 
 Each 
 
 5.00 
 
 9.00 
 
 4S280. 
 
 48284. 
 
 Reading Device for Beckinann Thermometer, w^ith 2 volt incandescent lanap for reading in 
 a dark room 3.50 
 
 Reading Device, as above, without incandescent lamp 2.00 
 
 Thermometer, Beckmann, with total range of about 3'^ C. divided in ,,',„", with capillary held 
 in place by glass wool; without auxiliary scale. Regularly furnished with scale read- 
 ing from OtoS^C, as convenient for calorimetric use. This thermometer is of good 
 German make of reasonable accuracy but is not regularly furnished with certifi- 
 cate 7.50 
 
 Thermometer, Beckmann, Goetze make, with scale held in place by glass sealing, with 
 auxiliary scale with range from — 10 to 120° C. in 2° divisions under reservoir: for use 
 by either boiling point or freezing point method; range 5° to 6° C. divided in ,,',5°; 
 highly recommended and widely used in calorimetry. Without certificate 15.00 
 
 With P. T. R. certificate 25.00 
 
 48292, Thermometer, Beckmann, similar to No. 4S2SS as to range, accuracy, etc., but with improved patent 
 adjustment of auxiliary scale by means of mercury drops instead of by tapping. This is accom- 
 plished by the introduction of a short capillary in the lower part of the reservoir, the point of 
 which is adjusted for delivering drops of mercury each equivalent to a definite range of the 
 thermometer scale, which information is engraved on the scale of each thermometer as, for 
 instance, 1 drop — 1.5° C. This arrangement prevents the dropping down of the mercury when 
 an upward movement is necessary, and superfluous mercury may be transferred to the two arms 
 at the side of the reservoir by simply inclining the thermometer. When a reservoir has become 
 filled during transportation it will empty itself automatically if the thermometer is held per- 
 pendicularly. In other reservoir arrangements this is frequently prevented by the small par- 
 tides of air which are often present in thermometers of best make. In this new arrangement 
 such air particles are caught and held below the inlet in the reservriir. This arrangement makes 
 possible very exact setting, greater durability and less risk of breakage in transportation and 
 obviates the continuous tapping down of the mercury column as heretofore practiced. See 
 
 CheniiJcer-Zeiiuvg, 1912, Nr. 88, S. 84S. Without certificate 18 00 
 
 With P. T. R. certificate 28.00 
 
ARTHUR H. THOMAS COMPANY 
 
 o O 
 
 No. 48328 No. 
 
 No. 4S336-40-4 
 
 48296. Thermometer, Recording (Thermograph) Richard, The thermometer consists of a copper tube of 
 elliptical crobs set tton, hermetically closed and filled with a volatile liquid. Thia thermometer 
 is of great sensibility and has wide application in the accurate control of temperature in large 
 incubators, incubating rooms, malting rooms, drying rooms, etc. The chart regularly furnished 
 with this thermometer is weekly and the range is from to 50° C. Other scales up to 110° C. 
 or 230° F. are furnished on order and charts may be arranged for hourly, daily or monthly records. 
 The movement of the pen is approximately 1 mm = 1° C, The thermometer is furnished with 
 a wire guard (removed in illustration) to protect same against injury. 
 
 Duty Free 24.00 Stock 35.00 
 
 48300. Weekly Charts for above, to 50° C. Per 100 2.50 
 
 48304. Thermometer, Recording (Thermograph) Short & Mason high drum clock type, with charts for from 
 — (j2 to +128°F.; with thermometer enclosed; consists of a bimetallic lamina arranged in such 
 manner that there are no levers other than the pen arm. This instrument permits of adjust- 
 ment to show temperatures covering any 75° F., 150" F., or 300° F. and is furnished with blank 
 charts in addition to the printed charts which by means of the Kew certified thermometer sup- 
 plied with the instrument enable the range of the instrument to be adjusted to meet special 
 
 conditions. Price includes certified thermometer 40.00 
 
 48308. Extra Charts, per 100 2.50 
 
 48312. " Pens, each 70 
 
 48316. Special Ink, per bottle 75 
 
 48320. Thermometer, Angle, with vertical tube 30 cm long and 2 cm in diameter and horizontal stem 15 cm 
 
 long and 1 cm in diameter; graduated in single degrees to 100° C. or 212° F 1.50 
 
 48324. Thermometer, Angle, same as above but with opal glass scale 2.00 
 
 48328. " Armored, engraved on stem with white background. The armor is of seamless steel 
 
 tubing heavily nickel plated. The thermometers are graduated on a basis of 3 inch immersion. 
 
 Range 0° to +30° to +30° to +30° to +100° to 
 
 220° F. 400° F. 600° F. 750° F. 1000° F. 
 
 Graduated in 2° 2° 2° 2° 5° 
 
 Length, inches 12 14 1(5 16 16 
 
 Each 4^50 5^5 ll.OO 7\l50 " 10.50 
 
 48332. Steel Mercury Wells, for use with above armored thermometers, as used in steam engineering prac- 
 tice. These wells have a very thin steel wall and insure quick transmission of heat. They are 
 provided with close fitting taper plugs to prevent the spilling of mercury in transportation. 
 Length of stem below thread, inches., 1^ 2 3 4 5 6 
 
 Each 1.50 1.80 2.40 3.00 3.60 4.^ 
 
 48336. Thermometers, Armored, for asphalt and sand testing. The glass is double the thickness of ordinary 
 glass stem thermometers and the bulb is pointed and so constructed as to reduce liability of 
 
 breakage to a minimum ; 6 inches long, range 100° to 600° F 6.00 
 
 48340. Thermometer, as above, for use in sand testing; range 200° to 750° F 7.50 
 
 48.%i4. " " " for inspector's use, G inches long and with a range of 20()° to 400° F 4.50 
 
 48348. Thermometer, Armored, for asphalt testing; range from 200^" to 450°F in 1° 5.00 
 
No. 483G0 No.4S3(;4 
 
 4S352. 
 48356. 
 
 Thermometer. Dairy, with enclosed paper scale, to 150° F,, length about S inches 25 
 
 Thermometer, Incubator, short form, for hanging inside the incubating chamber. The thermometer 
 is enclosed in a metal case with perforated outer sheath which turns so as to entirely enclose the 
 thennomclei, range from to 50° C 1.25 
 
 48360. Thermometer, Incubator, with very distinct graduations on a white background, so as to be readily 
 seen at a distance: range from to 50° C. with the standard temperature 37^° C. indicated by a 
 red line. Length 250 mm 2.50 
 
 48364. Thermometer, Incubator, self-registering maximum and minimum on Sixe's system; with opal glass 
 scale 160 mm long graduated from —20° to +50° C. The standard temperature 37^° C. is indi- 
 cated by a red line. The lower part for insertion in the tubulature of the incubator is 200 mm 
 long. Complete with horseshoe magnet for adjusting the indicators 5.50 
 
 48368. Thermometers, Incubator, with enclosed opal glass scale with Jena capillary. The standard temper- 
 ature 375° C., at which incubators are ordinarily operated, is indicated bv a red line. 
 
 Range to 50° C. 10° to 60° C. 
 
 Graduated in \ ^'„ 
 
 Length, cm 45 50 
 
 Each 4.00 .5.00 
 
 48372. Thermometer, Maximum and Minimum, on oak back, with each tube mounted on a separate plate 
 attached at one end with a thumbscrew so that the thermometers may be reset; range 10° to 
 40° F. below zero for the maximum tube and 20° to 60° below for the minimum tube, and up to 
 120° F. above ; ordinary quality 4.00 
 
 48376. Thermometer, Maximum and Minimum, standard Weather Bureau pattern, of high quality and with 
 certificate; with engraved stem, magnifying tube, cylindrical bulb, porcelain strip at side of 
 tube on which are marked the figures and every fifth degree line of the scale, oxidized brass plate, 
 insulating brass support with binding screws; board 15 by 5 inches, with mahogany finish. . 10.00 
 
 48380. Thermometers, Pocket, 5 inches long, mounted in a case similar to clinical thermometers; very con- 
 venient for various kinds of field work. 
 
 Range -30 to 120° F. +30 to 220° F. to 50° C. to 100° C. 
 
 Graduated in 2° 2° ^ ^° _ ^° 
 
 Each 2.25 ~ 2.25 2.25 ' 2.25~ 
 
 48384. Thermometer, Soil, mounted in wooden frame with handle and brass pointed ferrule 1.50 
 
 48388. " " in strong metallic ease and with scale reading from to 60° C. in roths and with 
 
 bore of various lengths depending upon the depth at which temperature is to be read. 
 
 Length of bore below handle, cm 50 _ 100 
 
 Each 12.50 " "15.00 
 
 48392. Thermometer, Sugar Factory, with enclosed paper scale to 50° F. in 1° divisions, diameter |th 
 inch 50 
 
 48396. Thermometer, Veterinary Clinical, with magnifying tube, as used in laboratory practice in taking 
 animal temperatures; in 5 inch hard rubber case; range from 92° to 110° F. in ^ths 1.25 
 
 48400. Thermometer, as above, in nickel case with chain and pin similar to 48380 1.50 
 
 48404. Thermometers. Titre Test, for soap and fat laboratories, engraved on stem with magnifying glass and 
 bulbs of .Jena Normal glass; graduated in -^° divisions. 
 
 Range 0-20° C. 10-30° C- 1.5-25° C . 20-30° C. 20-4 0° C. 30-5 0° C. 4 0-60° C . 
 
 Each 5.00 5.00 5.00 " 5.00 5.00 5.00 """ 5.00 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 N08. 48412, 48416 and 48420 
 
 48412. Thermo-regulator, Reichert. This regulator is carefully made and is the most widely used among the 
 several forms constructed of mercury and glass; adjusted for high temperatures 2.00 
 
 48416. Thermo-regulator, Reichert, same construction as ISo. 48412 but adjusted for low temperatures. . 2.00 
 
 48420. Thermo-regulafor, Reichert, same construction as No. 4S416 but made shorter for use in paraffiae 
 baths 2.00 
 
 48424. Thermo-regulator, Reichert. improved form, with stopcock to prevent total extinguishing of flame, 4.00 
 
 48428. Thermo-regulator, New Mercury Form, with reservoir tube with thermometer scale and two-way stop- 
 cock for adjustment. In setting the regulator the stopcock is set at position "A" and the bulb 
 warmed until the mercury reaches the position "B" at the tip of the glass outlet tube. The 
 stopcock is then turned to position "B" and the mercury column allowed to rise until it reaches 
 the temperature at which the regulator is to operate, when the cock is turned again to position 
 "A" and the thermo-regulator is in adjustment ■ 7.50 
 
 48432. Thermo-regulator, as above, with electric contact, otherwise operating on the same principle and by 
 the same method as above 10.00 
 
 48436. Thermo-regulator, Roux Bimetallic. The great advantage of this regulator consists in the entire 
 absence of mercury and glass, the control depending upon the unequal expansion of the different 
 metals composing the metallic couple. It has come into very wide use of recent years and is in 
 many ways the most satisfactory form of thermo-regulator now offered. All of our bimetallic 
 regulators are furnished with an additional brass jacket as shown in illustration. It is recom- 
 mended that this jacket be inserted in the tubulature of the incubator and the same filled with 
 glycerine, into which the regulator proper is immersed. This prevents the corroding of the 
 bimetallic couple (which occurs in many localities because of the action of the water) and at the 
 same time makes the regulator last longer. 
 
 Length, inches 10 12 
 
 Each 7.00 7.50 
 
 ill 
 
 No. 48440 
 
 48440, Thermo-regulator, Reichert-Novy. This regulator is based upon the principle of the Reichert Thermo- 
 regulator with modifications. It works equally well for high or low temperatures and is specially 
 recommended for accurate control when used with a gas pressure regulator 5.00 
 
N». 48444 No 4'USO No. 4«4in No. 48J68 
 
 48444. Thermo-regulator, Oreenraan. CuuotiULtciJ i.ntii<.l> uf ateel and recommended as being the most ac- 
 curate form of mercury regulator. CoQtrols temperature within 3° regardless of gas pressure or 
 room temperature. For use with this regulator burner No. 22936 is recommended. With brass 
 jacket for glycerine to be inserted in tubulature of incubator. Ses Anatomical Record, Sept., 
 1908. Without mercury 12.50 
 
 48448. Thermo-regulator, same as No. 48444 but filled with mercury 14.50 
 
 48452. Gas Pressure Regulator, for delivering gas to apparatus at a constant pressure, regardless of the varia- 
 tions of pressure in the house supply. Particularly recommended for use with the Reichert- 
 Nov3'^ Gas Regulator No. 4S440, with which it is possible to maintain very constant tempera- 
 tures. Made of copper throughout 5.00 
 
 48456. Thermo-regulator, Electric, with Condenser. Will automatically maintain a constant temperature 
 through a wide range, i, e., between 30° and 80° 0. The diaphragm consists of rubber and 
 metal clamped securely between steel rings. As the expansion of rubber when exposed to heat 
 is greater than that of metal, the diaphragm will move away from the platinum point at the 
 slightest increase in temperature. This breaks the circuit and allows the incubator to cool 
 until the diaphragm again touches the point. By varying the pressure between the adjusting 
 screw and the diaphrapn different degrees of heat in the incubator are thus obtained. Con- 
 tact points are of platinum iridium and the condenser protects these contacts from being 
 destroyed providing the electric current passing through same does not exceed ^ amperes, 
 i. e., the current from usual incandescent sockets 10.00 
 
 48460. Thermo-regulator, Electric, with Incandescent Lamp Heater, for heating incubators, paraffine baths, 
 etc., not specially built for electric heating and control; consisting of thermo-regulator 
 similar to above, with an incandescent lamp mounted on same board, with cord and plug for 
 attachment to any lamp socket. It is usually sufficient to place same on the bottom of the 
 incubator or oven and run the connecting cord through the horizontal hole found at the side 
 of most incubators. The space required by the entire equipment is 8 x8 x4J inches 12.50 
 
 48464. Thermo-regulator, Electric, expanding capsule type, "Break" form, for use alone with any electrical 
 
 heating medium which does not require more than 3 or 4 amperes. May be used on either 
 110 or 220 volt circuits either alternating or direct and for temperatures from 15° to 160° C. 
 The range of each capsule is about 20° in the lower temperatures and nearly 100° in high tem- 
 peratures. The capsule "C" must be within the heated chamber and the post "P" may be made 
 longer or shorter depending upon the length of the tubulation into which post must be inserted, 
 i.e., tubulation from the outside of the utensil through the air jacket, water jacket, etc., to 
 the inner chamber. The screws "S" need not be used as in many utensils it is sufficient to 
 allow the metallic cap "M" to rest on the top of the tubulation or of the incubator. Very satis- 
 factory on incubators, ovens, water and oil baths, whether disc heaters, resistance coils or lamps 
 are used for the heating medium. In ordering please state whether current is alternating or direct, 
 range of temperature desired, size of chamber, and thickness and material of the walls of same for 
 length of post "P;" and whether thermo-regulator is to be placed in a vertical or horizontal 
 position, vertical being preferable. With instructions for wiring, and connections 7.00 
 
 48465. Extra Expansion Capsules : 1.00 
 
 48468. Thermo-regulator, Electric, expanding capsule type, similar in operation to No. 4S464 but known 
 
 as the "Make" form and for currents up to 8 or 10 amperes. Must be used with circuit breaker 
 as a relay which indirectly interrupts the heating current. This is furnished with a circuit 
 breaker consisting of a solenoid wound with a heavy wire and with large platinum iridium 
 contacts 21.00 
 
48476. 
 48480. 
 
 4S484. 
 
 48488. 
 48492 
 
 ^ 
 
 r>u. ja.iUll No J550-1 
 
 Tiles, Earthenware, glazed on one aide only; verj' convenient for supplying either a black or white 
 background. 
 
 Color Black Whit e 
 
 Each " .30 .25 
 
 Tray, Aseptic Enamel Ware, of seamless steel, white enamelled, both acid and fire proof; convenient 
 for dissecting instruments, size 12 x 3§ x H inches 90 
 
 Trays, Aseptic Enamel Ware, of seamless steel, white enamelled, both acid and fire proof; deep form. 
 
 Size, inches lOi x 6i x 2^ 15 x 9 x 2| 
 
 Each 1.00 2.00 
 
 Trays. Aseptic Enamel Ware, of seamless steel, white enamelled, both acid and fire proof; shallow form; 
 very convenient in the laboratory for dissections on small animals. 
 
 Size, inches 12x9 16 x 12 20 x 15 
 
 Each ■ :80 1^30 2^ 
 
 Tray, Dissecting, of heavily tinned metal, japanned, with metal loops on the corners to which the limbs 
 of animals are tied during dissection. Melted wax may be conveniently run into these pans 
 in the laboratory if wax bottom is desired. Size 11x9x1^ inches 25 
 
 Trays, Glass, with vertical sides and polish d edges. 
 
 Length, mm 100 115 120 
 
 Width, mm 40 50 60 
 
 Height, mm 40 50 35 
 
 Each 50 "^60 TtO 
 
 Trays, Glass, with slanting sides and polished edges; much superior to ordinary photographic trays. 
 
 Length, mm 160 210 260 
 
 Width, mm 130 160 210 
 
 Each " .90"" l.25~ " 2.00 
 
 Trays, Glass, with vertical sides and polished edges. 
 
 Length, mm 200 265 350 350 
 
 Width, mm 100 165 170 220 
 
 Height, mm 45 50 50 60 
 
 Each 1.00 2.00 2.50 3^ 
 
 Trays, Sanitats Porcelain, deep form, with spout. 
 
 Length, mm I55 255 290 
 
 Width, mm 125 195 240 
 
 Each 75 ~" 2.50 ZM 
 
 if 
 
 Tongs, Crucible, of polished brass, single bent. 
 
 Length, mm 200 250 
 
 Each .50 M 
 
 Tongs, Crucible, of nickel plated brass, single bent. 
 
 Length, mm 200 250 
 
 Each. ._ ~ V6O"" .90 
 
 Tongs, Crucible, of steel with black oxidized finish, double bent, 200 mm long; recommended for stu- 
 dents' use 25 
 
^^&^ 
 
 ^«* 
 
 I 
 
 48518. 
 
 48532. 
 48536. 
 48.540. 
 
 48544. 
 
 48548. 
 
 48552. 
 48556. 
 48560. 
 
 No. 48560 No. 48561 
 
 Tongs, Crucible, of polished brass, double bent. 
 
 Length, mm 200 250 _ 300 
 
 Each 55 90 1.20 
 
 Tongs, Crucible, of nickel plated brass, double bent. 
 
 Length, mm 200 250 300 
 
 Each 65 1.00 1.30 
 
 Tongs, Crucible, of forged steel, nickel plated, single bent. 
 
 Length, mm 200 250 300 
 
 Each 50 .70 1.00 
 
 Tongs, Crucible, of forged steel, nickel plated, double bent. 
 
 Length, mm 200 250 300 
 
 Each .65 .85 1.20 
 
 Tongs, Crucible, of pure wrought nickel, double bent; 200 mm long 2.00 
 
 " " " solid German silver, double bent, 230 mm long 1.50 
 
 " " " with platinum tips or shoes. Our crucible tongs of steel No. 48528, of pure nickel 
 
 No. 48532 and of solid German silver No. 48536 are furnished with platinum shoes or tips at the 
 lowest market price of platinum. 
 
 Tongs, Crucible, of pure wrought nickel with nickel chromium tips, double bent, 200 mm long. A 
 
 new substitute for platinum tipped tongs and highly recommended 2.50 
 
 Tongs, Crucible, of malleable iron, single bent, heavy, for assay crucibles. 
 
 Length, inches 12 17 
 
 Each 40 .50 
 
 Tongs, Crucible, of wrought iron, double bent, 30 inches long; heavy for assay crucibles 1.75 
 
 Tongs, Cupel, of steel with curved ends and guide pin; 22 inches long 1.00 
 
 " " " " with bent ends and guide pin. Length, inches 20 25 30 
 
 Each VM Too 1.00 
 
 Tongs, Scorifier, of spring steel. Length, inches 20 30 36 
 
 Each 1.00 1.00 1.00 
 
 48568. 
 48572. 
 
 48576. 
 
 No. 4H5U8 No. 48572 No. 48576 
 
 Triangles, of twisted iron wire. Length of side, inches H _ 2 
 
 Each .05 .05 
 
 Per dozen 50 .50 
 
 Triangles, of iron wire covered with pipe-stem. 
 
 Length of side, inches H 2 
 
 Each -05 .05 
 
 Per dozen : 50 .50 
 
 Triangles, of iron wire covered with pipe-stem, flanged in center. 
 
 Length of side, inches l2_ ^ 
 
 Each 08 .08 
 
 Per dozen 75 .75 
 
48580. 
 48584. 
 
 48600. 
 48604. 
 
 Triangles, Solid Nickel. 
 
 Length of side, inchcw 
 Each.. 
 
 I5 
 
 1.00 
 
 .30 
 
 1.15 
 
 .35 
 
 1.25 
 
 15 .20 .25 .30 
 
 Triangles. Hoskins Nickel Chromium, of heavy wire of square cross section and distinctly superior 
 
 to triangles made of other market alloys of nickel and chromium. The alloy of which these 
 
 triangles is made contains practically no iron and takes on a thin adherent protective coat of 
 
 oxide which neither peels nor rubs off and which prevents the triangle adhering to platinum 
 
 ware placed upon it. 
 
 Length of side, inches I5 2 2-1 3 
 
 Each .20 
 
 Triangles, Opaque Fused Silica. 
 
 Length of each side, inches I5 2 2] 
 
 Each .75 ' .75 .90 
 
 Triangles, Nichrome Wire covered with pure fused opaque silica. 
 
 Length of each side, inches I5 
 
 Each T25 
 
 Trichinoscope, for the Trichina Test by Micro Projection. The com- 
 pressoriura sample is covered square by square in the field of the 
 microscope and thrown on the screen. The observer controls both 
 the focusing of the microscope and the movement of the specimen 
 while observing the screen from position at table. The operation 
 is much less laborious and more satisfactory than with the ordinary 
 microscope. As furnished by us to the U. S. Department of Agri- 
 culture, Bureau of Animal Industry. The outfit includes iron sup- 
 ports, projecting system with two objectives, compressorium, 
 nosepiece for revolving the objective, cooling chamber and hand regu- 
 lating arc lamp for 5 amperes, direct current rheostat for same for 
 110 volts, and 50 pairs of carbons. 
 Duty Free 155.00 Duty Paid 208.00 
 
 Trichinoscope, as above, but with automatic arc lamp. 
 
 Duty Free 190.00 Duty Paid 253.00 
 
 Resistance, for 220 vnlt circuit. 
 
 Duty Free 5.40 Duty Paid 7.20 
 
4860S. 
 48612. 
 
 48620. 
 48624. 
 
 Tripod, of cast iron, 6 inches liigii witli ring 3 inciies inside diameter; suitable for al 
 Ijurners 
 
 Tripods, of cast iron, smoothlj- finished and well japanned; 9 inches high. 
 
 Outside diameter, inches 4 .5 6 .S 
 
 Each .25 .25 .30 .50 
 
 Tripods, of cast iron, smoothly finished and well jap; 
 
 nail 
 .20 
 
 d, with concentric ri 
 5 G 
 
 2 3 
 
 Outside diameter, of rings inches 
 
 Number of rings 
 
 Each 
 
 Tripod, of iron, with adjustable support for burner, 9 inches 
 
 Tripod, of iron, with triangular top; 9 inches high. 
 
 Length of side, cm 10 
 
 Height, cm IS 
 
 Each ^50 
 
 10 
 .65 
 
 leight 9 inches. 
 10 
 
 12 
 
 _ 8 
 .40 .75 1.00 ' 1.40 
 
 h with ring 3i inches inside diameter .75 
 
 12 
 20_ 
 .60 
 
 15 
 23 
 
 20 
 
 25 
 
 48636. 
 
 48640. 
 
 48644. 
 
 48648. 
 
 486.52. 
 48656. 
 
 Tripod, Genth, exactly as used in the John Harrison Chemical Laboratory, University of Pennsylvania; 
 of cast iron, with slip-in legs and removable plate; diameter 10^ inches, diameter of removable 
 plate 7i inches, height 7§ inches 1.00 
 
 Tripods, of sheet iron, with metal chimney for the protection of the flame; very convenient for flat 
 bottom flasks or wire gauze. 
 
 Height, mm 2W 265 290 
 
 Height of chimney, mm 100 115 130 
 
 Inside diameter of chimney, mm 100 125 130 
 
 Each ^50 X5 M 
 
 Tripod, of sheet iron, with metal chimney for protection of the flame, with supports curved downward 
 to take round bottom flasks, evaporating dishes, etc. ; height 200 mm by 60 mm diameter of 
 chimney 60 
 
 Tubes, Brass, T-shape. Bore, inches . 
 
 Each 
 
 Tubes, Brass, Y-shape. Bore, inches. . . . 
 
 Each 
 
 Tubes, Glass, T-shape. Bore, mm 3_ 
 
 Each .06" 
 
 Tube, Glass, T-shape, with two Geissler stopcocks, bore 5 mm 2.25 
 
 Tubes, Glass, U-shape. Bore, nmi _3 5 6 J^ 12 18 25 
 
 Each .06 .08 .09 .10 .14 .30 .45 
 
 Tubes. Glass, Y-shape. Bore, mm 3 _ Jj_ _ 6 9 12 18 25 
 
 Each 06 .08 .09 
 
 .30 
 
 6 
 .09 
 
 A 
 
 .35 
 
 .10 
 
 .10 
 
 _ 9 
 .10 
 
 .45 
 
 .50 
 
 A 
 
 1 
 
 .45 
 
 .50 
 
 18 
 
 26 
 
 30 
 
 .45 
 
n 
 
 :o 
 
 ^>«Wi'.",'i-i.^ 
 
 48664. 
 
 48668. 
 
 48672. 
 48676. 
 
 48678. 
 21904. 
 
 48680. 
 
 Tube, Vivien, for ^u^, ir ainhsib, as dtbtiibed in 1 tuhliug & Huiiultz 60 
 
 Tube, Hortvet, for use m the centrifuge in determining lead preeipitAtes in the analysis of sugar>nd 
 syrup. See Bulletin No. 107 of the U.S. Department of Agriculture, Bureau of Chemistry .75 
 
 Tubing, Flexible Metallic, recommended as being safer and much more permanent than rubber tubing, 
 ■j^ inch diameter. Per foot 20 
 
 Tubing, Flexible Metallic, in lengths for Bunsen burner connections; with rubber connectors at both 
 ends; \ inch diameter. 
 
 Length, feet 2_ _2| 3 
 
 Each 25 .30 .50 
 
 Extra Rubber Connectors, each 05 
 
 Tumbler, of glass, with spout, capacity 7 oz. 10 
 
 " as above, without spout 05 
 
 48684. 
 48688. 
 48692. 
 48696. 
 48700. 
 48704. 
 
 Turbidimeter, Jackson, for determining sulphates in water analysis, etc., complete with 22 cm tube. 12.00 
 
 Extra 22 cm tube, for above 2.50 
 
 " 75 cm " " " 5.00 
 
 Brass extension for use with long tubes 3.00 
 
 Candles, per dozen 2.50 
 
 Turbidimeter, U. S. Geological Survey type, as used in water analysis in connection with water plants, 
 filtration installations, etc. ; as described in Bulletin 151 of the U. S. Geological Survey and Bulle- 
 tin 8 of the Division of Hydrography. Complete for both color and turbidity, packed in morocco 
 covered case 30.00 
 
 Turbidimeter, as above, color outfit only, consisting of 6 amber color discs and 4 aluminum color tubes, 
 packed in morocco covered case 27.00 
 
 Turbidity Tape, flexible, with rod, in wooden case 5.00 
 
 Large equipment lists can not always be made up from 
 the catalogues of any one manufacturer or dealer. The lead- 
 ing European manufacturers of Laboratory Apparatus supply 
 us with their original catalogues in limited quantities for dis- 
 tribution to intending purchasers. A partial list of such man- 
 ufacturers is found on page V. 
 
 A selection of catalogues of the leading manufacturers of 
 Europe can be obtained from us more promptly than by writing 
 to all of the firms in whose goods you are interested. 
 
If» 
 
 No. 48744 No. 48748 No. 48760 
 
 No. 48764 No. 48768 
 
 URINE ANALYSIS APPARATUS. 
 
 48720. 
 48724. 
 
 48728. 
 48732. 
 
 48736. 
 
 48740. 
 
 48744. 
 Apparati 
 
 48748. 
 48752. 
 48756. 
 48760. 
 48764. 
 
 48768. 
 48772. 
 
 Albumino meter, Esbach, for the quantitative determination of alijumen in urine, "-raduated to read 
 
 grams of albumen per liter of urine; in wooden case " gO 
 
 Albuminometer, Esbach, on glass foot .'..'. 1.00 
 
 " Esbach-Schelenz, with constriction near base for more accurate reading of small 
 
 quantities ; in polished wooden case 90 
 
 Albuminometer, (Horismascope,) for the detection of albumen in urine with nitric acid .... '. , . l!oO 
 Albuminometer, for the rapid quantitative determination of albumen in urine by the use of the tube 
 
 in a centrifuge 1_25 
 
 Chromo-Saccharometer, for the determination of sugar in urine to within -^% by the colorimetric 
 
 method; rapid and accurate; complete with directions 5.00 
 
 Purinometer, Hall, for the quantitative determination of purin bodies in urine, with wooiden base' 
 
 without solution 7_50 
 
 Reaction Glass, Ranke, for Ehrlich's diazo reaction 60 
 
 us for Folin's New Method of Determination of Total Nitrogen, Urea and Ammonia in Urine. See Journal 
 
 of Biological Chemistry, Vol. XI, No. 5, June. 1912. 
 
 Ostwald Pipette, 1 cc capacity, delivering 1 cc at 20° C 60 
 
 2 cc " " 2 cc " " 75 
 
 Glass Trap for Ammonia 50 
 
 Fume Absorption Tube, furnished straight for bending at desired angle in the laboratory 50 
 
 Connecting Tube, for use with above Absorption Tubes. Number of arms,. 4 5 g 
 
 Each ^85' 
 
 Condenser Tube for urea, 250 x 15 mm _^ 
 
 Ammonia Absorption Tube, small, with perforated end, 265 x 8 mm 20 
 
 Jena Glass Test Tube, 200 x 20 mm '..'.'..'.'.'... .\Q 
 
 Temperature Bulb, filled with mercury chloride iodide 40 
 
 1.00 
 
 1.15 
 
 48788. Ammonia Apparatus, Folin, complete, consisting of special ammonia absorption tube No. 48790, cylin- 
 der, drying tube and bottle, with rubber stopper 2.50 
 
 48790. Ammonia Absorption Tube, Folin 100 
 
s^= 
 
 No. 48824 No. 
 
 No. 48840 No, 48S44 
 
 48792. 
 48796. 
 
 48800. 
 
 48808. 
 48812. 
 48816. 
 
 48828. 
 48832. 
 
 48840. 
 48844. 
 48848. 
 
 48852. 
 48856. 
 48860. 
 
 Urea Bulb, Folin, for determination of urea 1.00 
 
 Urea Apparatus, Folin, complete, consisting of special urea bulb No. 4S792, fiask and rubber stopper. 1.30 
 Saccharometer, Einhorn Fermentation, for the determination of sugar in urine; consisting of a grad- 
 uated fermentation tube and a graduated test tube. The percentage of sugar present is read 
 
 directly on the tube .75 
 
 Saccharometers, set of two, one for the urine under examination and the other for a normal urine to 
 which glucose has been added for the purpose of testing the efficiency of the yeast used, . 1.50 
 
 Saccharometer, Lohnstein, for the accurate determination of sugar in diluted urine 2.25 
 
 Saccharometer, Lohnstein Precision or large model, for use with undiluted urine 6.00 
 
 Fermentation Saccharometer, Einhorn's improved form with glass stopcock and graduated test tube 
 
 as furnished with No. 48800 2.00 
 
 Fermentation Saccharo- manometer, on wooden board for hanging on the wall. As described in Med- 
 iziniscken Wochenschrift, 5S, Jahrg., Hefl 48. A new and convenient device for estimating the 
 
 sugar in urine with an accuracy approximating the polarimetric method 9.00 
 
 Ureometer, Doremus, for the quantitative determination of urea in urine by the hypobromite method; 
 
 with pipette, but without glass foot '. 75 
 
 Ureometer, Doremus, same as No. 48824, on glass foot 1,00 
 
 Dropping Pipette, only, for use with No. 48824 or No. 48828 20 
 
 Ureometer, Doremus-Hinds, improved form, with graduated side tube with glass stopcock from which 
 tlic exact amount of urine may be introduced into the fermentation tube without any gas escap- 
 ing from the bulb; without foot 2.50 
 
 Ureometer, Doremus-Hinds, same as No. 48836 on glass foot 2.75 
 
 Uricometer, Ruhemann, for the quantitative determination of uric acid 2.50 
 
 Urinometer, Squibb, graduated from 1.000 to 1.060; length 120 mm; in case with cylinder but without 
 
 thermometer 75 
 
 Cylinder only for above 15 
 
 Thermometer only for above 40 
 
 Urino-Pycnometer, Saxe, for the rapid determination of the speuitif gravity of small quantities of 
 urine, with cylinder, in case 2.50 
 
 544 
 
48864. Urinometer, Precision, set of 4 spindles witli a range of 1.0060 to 1.0380, for 100 oe of urine; witli cylin- 
 der, in case. Can be also used for the calculation of the lowering of the freezing point in 
 albumen and sugar -free urine by use of the factor 0.75° C. See Zeitschrift fur angewandte Chemic 
 1902, Seile 1072 and SahU "Lchrhuch der klhiscken Untersuckungsrmlhoden, 5. Aujlage 1909, Seite 
 
 752. Per set g.OO 
 
 488(>8, Urinometer, Precision, same as above but with thermonieter on each spindle. Per set 8.00 
 
 48872. Urinometer, Vogel, for accurately determining the specific gravity of urine, consisting of two spindles 
 
 graduated respectively from 1.000 to 1.025 and from 1.025 to 1.050; with cylinder 1.50 
 
 48876. Cylinder only for above 50 
 
 48880. Spindles " " •' .each 50 
 
 48884. Vapor Density Apparatus, Victor Meyer, improved form, complete 2.00 
 
 48888. Inner Tube only for above 1 00 
 
 48892. OuterTube " " " ......'.'. IM 
 
 48896. Glass Bottle with ground glass stopper for above 10 
 
 48900. Vials, glass stoppered, flat bottom with slight neck and ground in air tight stopper; so-cailed "Speci- 
 men" vials. 
 
 Capacity, cc 2 3 4 6 8 
 
 PerlO .55 .55 liO 775 ' .90 
 
 48904. Vials, glass stoppere<l, with fiat bottom, without neck. 
 
 Height, mm 50 65 
 
 Diameter, mm 16 IS 
 
 Each 712 7i5^ 
 
 48908. Vials, homeopathic, long form, with neck and flat bottom and cork stopper. 
 
 Height, mm 63 75 90 
 
 Diameter, mm 11 12 14 
 
 30 
 20 
 
 .SO 
 25 
 
 19 
 4.00 
 
 120 
 JO 
 5.00 
 
 90 
 
 17_ 
 
 Per gross l!25 1-50 2.00 3.00 
 
 Vials, homeopathic, short form, with neck and flat bottom and cork stopper. 
 
 Height, mm 45 55 63 70 75 83 
 
 Diameter, mm 14 16 17 20 23 24 
 
 Per gross 1.25 1.50 2.00 3^00 4J)0 5^ 
 
 Vials, homeop.athic, short form, with neck and flat bottom and Cork-lined metill screw-cap. 
 
 Height, mm. . 
 Diameter, mm. . 
 
 48 
 15 
 
 5S 
 
 63 
 
 Per gross 3.00 3 
 
 ;, cylindrical specimen, so-called 
 and including cork stoppers. 
 
 Height, mm 
 
 Diameter, mm 
 
 Per 100 
 
 Height, mm 
 
 Diameter, mm 
 
 75 4.00 
 
 "Shell Vials,' 
 
 6S 63 75 88 138 
 
 20 22 22 _ 22 22 
 
 5.00 7.00 7.50" XOO " 10^ 
 
 without constriction at neck, with flat bottom 
 
 35 
 
 35 
 
 35 
 
 .85 
 60 
 
 40 
 
 70 
 20 
 
 40 
 
 20 
 
 1.10 
 
 80 
 
 50 
 
 50 
 20 
 1.25 
 80 
 25 
 
 Per 100 2.30 .90 1.50 2.75 1.10 1.75 3.00 1.25 1.75 3.50 
 
 Warming Table, Huber, with top of heavy copper 14 inches long by 4 inches wide; for fixing blood 
 films, drying micro sections, etc 1.25 
 
48944. 
 4894S. 
 
 48952. 
 48956. 
 
 Washing Bottle, consisting of a No. 28104 Flask, extra heavy, rubber stopper and glass tubes. 
 
 Capacity, c.q. 250 -500 _ 1000 _20^ 
 
 Each 40 .50 .75 1.00 
 
 Fittings only for Washing Bottle No. 48928, i. e., rubber stopper and glass tubes without flask 10 
 
 Washing Bottle, New Jena Glass, with rubber corks and Jena glass tubes. 
 
 Capacity, cc _250 500 1000 1500 2000 
 
 Each 68 .90" 1.05 1.20 1.30 
 
 Washing Bottle, Faraday, consisting of a No. 28104 flask, extra heavy, with rubber stopper, glass 
 tubes with rubber joint in outlet tube to give flexibility. 
 
 Capacity, cc 250 500 1000 2000 
 
 Each .40 .50 .75 ' i^ 
 
 Fittings only for Washing Bottle No. 48940, i.e., rubber stopper and glass tubes without flask 10 
 
 Washing Bottle, same as No. 48940 but with rattan covered neck. For convenient holding while hot. 
 
 Capacity, cc 500 1000 
 
 Each 70 M~ 
 
 Washing bottle, arranged for continuous flow, 500 cc capacity 70 
 
 Fittings only for Washing Bottles, consisting of rubber stopper, and glass tubes arranged for con- 
 tinuous flow 50 
 
 Washing Bottle, for volatile liquids, with ground in glass stopper. 
 
 Capacity, cc 125 250 _ _ 500 1000 
 
 Each .80 1.00 ' 1.25 YM 
 
 Washing Bottles, for volatile liquids, with ground in glass stopper and two glass stopcocks. 
 
 Capacity, cc 125 250 500 1000 
 
 Each ''~ "" 
 
 2.25 
 
 2.50 
 
 2.75 
 
 3.00 
 
 Washing Apparatus, Bain, for microscopic material; consisting of a glass cylinder with base and a 
 
 discharge tubulation at the top; with a plain glass tube fitting into same with a one-hole cork 
 
 r;7z,--^ stopper at bottom and a set of 6 sieve thimbles, one end of which 
 
 l|-"5"i is bound with fine silk bolting cloth. The washing liquid is allowed 
 
 to drop into the inside cylinder and, after passing through the sieves, 
 
 rises in the outside cylinder and flows off through the outlet "C," 
 
 with 6 sieve thimbles 2.50 
 
 f^=N^C 
 
 n 
 
 n 
 
 Extra Sieve Thimbles, cai-li 
 
 4S976. Waste Pail, Aseptic Enamel Ware; of seam- 
 less steel, white enamelled, both acid and 
 fire proof; very convenient in the labora- 
 tory; with perforated tray which retains 
 the solid matter such as filter paper, 
 etc.; which may be lifted out before the 
 bucket ia emptied; 16 inches high, 12 
 inches diameter, 5 gallons capacity. 6.00 
 
ARTHUR H. THOMAS COMPANY 
 
 7 
 
 (i -,!,"' T- f I 
 
 V^\ 
 
 48980. 
 48984. 
 
 Watch Glass, with (.' 
 
 49008. 
 49012. 
 49016. 
 
 49020. 
 49024. 
 49028. 
 49032. 
 
 49036. 
 
 85 90 
 .07 
 .75 
 
 L'lwe center and a small facet on the hrjttoni ; 4o lain diameter. Each 05 
 
 Per dozen. . .50 
 Watch Glasses, of well annealed glass, with edges smoothly ground. 
 
 Diameter, mm 2.5 30 3.") 40 50 f)5 75 
 
 Each .n .03 .03 .03 .03 .05 .05 
 
 Per dozen .25 .25 .25 .25 .25 .50 .50 
 
 Diameter, mm 100 ^115 _ 125 140 IpO Ifiri 
 
 Each 
 
 Per dozen 
 
 Watch Glasses, New Jena Glass. 
 
 Diameter, mm 45 50 _ 60 70 SO 
 
 Each 08 .09 .10 .13 .15 
 
 Diameter, mm 120 _ IM 150_ _ 1 70 190 
 
 Each 
 
 .12 
 1.30 
 
 .17 .22 .25 .30 ..30 
 1.80 2.40 2.50 3.00 3.00 
 
 90 
 .20 
 
 2_I0 
 
 :95" 
 
 100 
 
 220 
 
 200 
 .35 
 
 110 
 .35 
 235 
 1.15 
 
 25 
 
 65 
 
 43 .50 .63 .80 .85 
 
 Watch Glasses, in Pairs, with edges accurately ground together, for use with clamps Xo. 24670. These 
 are not to be confused with counterpoised watch glasses No. 49000. 
 
 Diameter, mm 50 65 
 
 Per pair 15 
 
 Watch Glasses, in Pairs, with clamps No. 24670. 
 
 Diameter, mm 50 
 
 Per pair 30 .45 
 
 Watch Glasses, Counterpoised in Pairs, accurately adjusted for interchangeable use on balance pans. 
 
 Diameter, mm 50 65 75 
 
 Each ^65 ^5 ToO 
 
 Watch Glass, Embryological, consisting of a glass block 1^ inches square with a concavity 1^ inches in 
 diameter by fths inch deep; and with one vertical surface ground for writing upon. Bottom 
 
 of concavity is fairly flat but with moid finish, i.e. not polished, with glass cover 08 
 
 Watch Glass, Embryological, similar to No. 49004 but with polished spherical concavity 15 
 
 " " " . " " " " " of polished black glass 25 
 
 " " " made of a single piece of polished plate glass with concavity with flat 
 
 polished bottom and plate glass cover; concavity is 30 mm in diameter by 6 mm deep: the flat 
 
 polished bottom permits its satisfactory use on the microscope stage 50 
 
 Watch Glass, Embryological, of white glazed Royal Berlin porcelain, 30 mm square with a concavity 
 
 21 mm in diameter 25 
 
 Watch Glass, Syracuse form, without ground bevel. Each 05 
 
 Per gross 6.00 
 
 W'atch Glass, Syracuse, as above but with ground bevel for writing upon. Each 06 
 
 Per gross 7.50 
 
 Watch Glasses, of glazed porcelain. Furnished in nests of five dishes, with cover. 
 
 Outside diameter, inches 2i 3 
 
 Each 00 70 
 
 Watch Springs, for burning in oxygen. Per dozen 25 
 

 No. 49076 
 
 ver and steam 
 
 10 
 
 12 
 
 5.00 
 
 9.50 
 
 S 
 
 10 
 
 4.50 
 
 s.oo 
 
 111 
 
 12 
 
 5.60 
 
 10.10 
 
 No. 490B4 No. 49(»;S N», 49072 
 
 49040. Water Baths, of heavy coppoi, tin lined; liemisplierii^al furm, with concentric rinp, 
 escape. 
 
 Diameter, inches 4 5 5| (1 S; 
 
 Each 1.00 1.25 1.40 1.60 2.50 
 
 49044. Water Baths, same as No. 40940 but with cock and exhaust for steam heating. 
 
 Diameter, inches. 6 
 
 Each 3.,^0 
 
 49045. Water Baths, same as Xo, 40940 but with constant water level. 
 
 Diameter, inches 4 5 5^ 6 8 
 
 Each f.66 TSS 2700 2720 " 3.io~ .-. 
 
 49052. Water Baths, of cast iron, white enamelled inside; with flange for supporting tripod and copper rings. 
 
 Diameter, mm 120 150 200 240 
 
 Each 1.50 2.25 3.50 4^0 
 
 490.i(). Water Bath, of pressed sheet steel, inside white enamelled, outside maroon enamelled; with copper 
 rings but without tripod. 
 
 Diameter, mm 160 200 
 
 Each 350 500 
 
 49060. Water Bath, of polished copper, tin lined; with cover, steam escape, copper concentric rings and per- 
 forated plate for test tubes. 
 
 Diameter, inches 8 
 
 Each 3_00 4.50 
 
 490K4. Water Bath, Blair, with test tube rack; of polished copper, 175 mm diameter; as used in iron analysis 
 
 49068. Water Bath, Hofmann, of heavy polished copper with diameter at top S inches, with a set of concen- 
 tric rings and plate with five holes of different sizes each with cover. With constant water level 
 and handles, without tripod 6,75 
 
 49072. Water Bath, Royal Berlin Porcelain, consisting of two porcelain dishes fitting one inside the other. 
 
 Outside diameter, mm HO 140 
 
 Each 1.20 " 1.80 
 
 49076. Water Level Regulator, of brass, can be attached to any of our water baths. The level of the water is 
 regulated by adjusting the center brass tube; length 3^ inches 1.50 
 
490S0. Water Bath, new form, with water level regulator; of polished copper, 6 inches in dianiefor by 4 inches 
 ilecp, on tripod 9 inches high 6.00 
 
 49084. Water Bath, consisting of Bath No. 49040 of sheet steel, white enamelled inside and maroon enamelled 
 outside, with copper rings, water level and special tripod to fit; 160 mm diameter 6.00 
 
 49088. Water Baths, funnel form, with tripod and constant water level. 
 
 Diameter, inches 8 
 
 Each 3.50 4.50 
 
 49092, Water Bath, for dissolving steel samples; of heavy, polished copper, tinned inside, with test tube rack, 
 6 inches in diameter by 7 inches high, taking eighteen 6 x f inch dissolving tubes 4.50 
 
 49096. Water Bath, rectangular, for dissolving steel samples, of heavy copper 7.J inches square by 6^ inches 
 high; with perforated tray to hold 25 test tubes 8 x f inches; on support with iron legs. . . . 6,50 
 
 49100. Water Bath, of cast iron, white enamelled inside, with copper rings, constant water level, tripod and 
 safety gauge; for use with inflammable liquids. 
 
 Diameter, mm 160 200 
 
 Each 9.00 11.50 
 
 49104. Perforated Inset, of polished copper, for use in water baths No. 49040 and No. 49064. 
 
 For bath, mm 160 200 
 
 To hold test tub.'s 18 34 
 
 Each 1 .50 2.00 
 
 Water Bath, Wiley, Patented, heavy copper, 
 for economizing time and gas; with 
 twelve holes 3^ inches in diameter and 
 two holes 5| inches in diameter. The 
 top of the bath is 14 x 25^ inches; the 
 cup is of heavy spun copper and easily 
 replaced when burnt out; without 
 porcelain rings 25.00 
 
ARTHUR H. 
 
 THOMAS COMPANY 
 
 n\ 
 
 49116. 
 49120. 
 49124. 
 49128. 
 49132. 
 49136. 
 49140. 
 49144. 
 
 49148. 
 49152. 
 
 No. 49152 
 
 Water Bath, of copper, tin lined and highly polished; with concentric rings, stopcock to draw off the 
 water, Kekule's water level regulator, extra sheet iron bottom and detachable legs; with seven 
 
 openings, three 6 inches in diameter and four 4 inches, with rings and cover 20.00 
 
 Water Bath, same as No. 48112, fitted with steam coil 24.00 
 
 " " " " " " for electric heating, three heat 50.00 
 
 " " " " " " " " " one heat 45.00 
 
 Water Bath, same as No. 48112, but with eight openings, each 5 inches in diameter 22.00 
 
 " " " " " 49128 but fitted with steam coil 26.00 
 
 " " " " " " " for electric heating, three heat 60.00 
 
 " " " " " " " " " " one heat 55.00 
 
 Water Bath, similar in construction to No. 49112 but with 4 openings, 5 inches in diameter, with rings 
 
 and cover 14.00 
 
 Water Bath, same as No. 49144 but fitted with steam coil 18.00 
 
 Water Bath, Victor Meyer, with improved support and including 2 porcelain plates as shown in illua- 
 
 frotioD, glass funnel and water level regulator; 8 inches in diameter 10.00 
 
 Glass Funnel, only, for use with above 1.20 
 
 49160. Water Bath, Hearson Electric, with constant water level. By means of an electric heater water is kept 
 
 constantly at a boiling point and the upper compartment filled with steam. Boiling water can be 
 drawn off at any time for use for other purposes. 
 
 Size, inches 24 x 12 x 5 30 x 12 x'i} 
 
 Number of holes 10 24' 
 
 Diameter of holes, inches 31 2J 
 
 Duty Free 53^25 64.65 ~ 
 
 Duty Paid 80.00 97.00 
 
ARTHUR H. THOMAS COMPANY 
 
 No. 49164 No. 491fi4 
 
 Water Bath, Electric, of heavy polished copper, tin lined, with heating coil immersed in the water 
 chamber. This coil is arranged for three heats, controllable by means of a one-plug switch. It 
 will hold water at the boiling point when running on the high heat. The smaller size bath takes 
 400 Watts per hour on the high heat. At the rate of 8ff per KW, the operating expense on the 
 high heat is 3.2s; pei" hour, on the medium heat U^ and on the low heat H per hour. A remov- 
 able cover is provided containing two sets of rings on the small bath and four sets on the large 
 bath, also a removable copper tray resting inside of the bath for use with beakers, evaporating 
 dishes, etc., immersed in the water as shown in illustration. The bath provides a very conven- 
 ient method for the distillation of volatile liquids with absolute safety because of the immersion 
 of the heating element, also fat extractions, etc., as shown in illustration. No special wiring is 
 necessary, the connection being made with ordinary lighting circuit either alternating or direct 
 current but voltage must be specified in ordering. 
 
 Size, inches 15 x 8x5 1 5 x 15x5 
 
 "35.00" 54.00 " 
 
 Each 
 
 _^^_ . 
 
 ^^^-^^^ 
 
 "3-^ 
 
 49168. 
 49176. 
 49184. 
 
 49192. 
 
 No. 49184 No. 491(;S 
 
 'water Bath, Matthews, as used in the Philadelphia Textile School, with four poicolain beakers, 325 Co 
 capacity, with spout. Complete with gas burner, protection plate and beaker collars. . . . JIM 
 
 Water Bath, Matthews, as above, for use with either glycerine or calcium chloride as heating medium; 
 of extra heavy copper with hard brazed seams; with four porcelain beakers 26.00 
 
 Water Bath, for Dyers as widely used in the textile industry; with beakers or dye pots our No. 21832 
 
 with lid but without burner. Number of beakers _3 6 _ 
 
 j.^i.[i 20.75 36.50 
 
 Water Bath,' tor 'Dyers same" as' above but of heavy copper and with hard brazed seams for use with 
 
 elycerine or calcium chloride as a heating medium. Number of beakers _3 (i__ 
 
 Lch 25.75 44.00 
 
No. 49204 to 49240 No. 19241 
 
 49200. Water Bath. Reischauer, for volumetric maltose detenu inat ions, etc.; with tripod and tube holder. 8.00 
 Water Examination Apparatus, Whipple, for the Microscopic Examination of Water, as described in 
 "The Mi cru&copy of Drinking Water," by Geo. C. Whipple; consisting of the following: — 
 
 49204. Sedgewick-Rafter Funnel, graduated, with attachment and rubber stopper . 2-50 
 
 49208. " " " ungraduated " " " " " 1.50 
 
 49212. Berkshire Sand, per !b 10 
 
 49216. Bolting cioth discs, per dozen 15 
 
 49220. Support for funnel 1.30 
 
 49224. Counting Cell 3.00 
 
 49228. Cover Slip 10 
 
 49232. Evepiece Micrometer 3.50 
 
 49236. Pipettes 1 cc and 5 cc 20 
 
 49240. Flask, graduated, 25 cc. . , 30 
 
 49244. Water Heater, Fletcher with attachment for instantaneously heating water. When connected with 
 r'old water faucet hot water is delivered in three seconds after gas is lighted. Gas supply of | inch 
 clear bore is recommended. Complete with burner as illustrated 6.00 
 
 49248, Heating Attachment only, of Xo. 49244 without 
 burner 4.00 
 
 49352. Water Heater, same as No. 49244 but with wheel valve, 
 for use with gasoline gas 7.00 
 
 49256. Water Heater, for instantaneously delivering water from 
 luke warm to boiling point when connected with 
 cold water faucet. Gas supply should be f inch 
 clear bore. Small size consumes 20 ft. of gas per 
 hour and large size 40 ft. The small size will heat 
 1 pt. of water per minute from 50° F. or will boil 
 15 quarts per hour, the capacity of the larger size 
 being about double that of the smaller. These 
 heaters are supplied with a pilot light and are 
 made entirely of brass and copper, polished and 
 nickel plated. 
 
 Size Small Large 
 
 Each 25.00 30.00 
 
 49260, 
 
 Extra for burner adjusted for gasoline 
 gas on either size 
 
 1.00 
 
49264. 
 
 49268. 
 
 49276. 
 
 49280. 
 
 49300. 
 49304. 
 
 49316. 
 49320. 
 
 No. 49320 No. 49324 
 
 Water Sampling Apparatus, Esmarch, consisting of a glass bottle in a metal frame with parts so ar- 
 ranged that when the apparatus is lowered to the desired depth the stopper is removed, where- 
 upon the bottle fills, after which the stopper is replaced 9,00 
 
 Water Tester, Dionic, for the exact measurement of small quantities of known substances in water by- 
 measurement of the electric conductivity of the solution- Consisting of a special glass vessel 
 with terminals for the water under test and a conductivity meter reading directly and without 
 calculation the conductivity of any electrolytic solution in the tube, as ased for measuring leak- 
 age into surface condensers, testing of boiler feed water, hard material in sewage, determina- 
 tion of sewage effluent, the purity of distilled water, etc.; for very weak solutions 
 Duty Free 111.00 Duty Paid 148.00 
 
 Wafer Tester, Dionic, for use with sea water and solutions of a similar nature. 
 
 Dufy Free 114.00 Duty Paid 152.00 
 
 Wax, Sealing, first quality, in sticks. Per ib. 50 
 
 Weighing Bottles, high form, with flat bottom and ground glass stopper. 
 
 Height, mm 60 80 100 120 
 
 Diameter, mm 10 15 23 32 
 
 Each ."Is .20" .30 ^.40 
 
 Weighing Bottles, same as No. 49280 but with round bottom. 
 
 Height, mm 60 SO 
 
 Diameter, mm 10 15 
 
 Each Tl8 Jo~ 
 
 Weighing Bottles, w'ide form with flat bottom and ground glass stopper. 
 
 Height, mm 40 50 50 60 
 
 Diameter, mm 25 30 _ 38 30 
 
 Each 25 ^0 ~" .40 .35~ 
 
 Weighing Bottles, low form, with flat bottom. 
 
 Height, mm 30 
 
 Diameter, mm 50 
 
 Each ;85~ 1.10 1.50 
 
 Weighing Bottle, conical form with flat bottom and ground glass stoppper. 
 
 Capacity- cc 15_ 30 60 
 
 Each "^35 " .40 " ."50 
 
 Weighing Bottle, conical form, with extra wide mouth and with lower part of stopper sealed over. 
 Otherw-ise the same as No. 49296. Capacity, 15 cc 35 
 
 Weighing Bottle, 60 mm long, consisting of two cylindrical tubes, one sliding into the other 20 
 
 Weighing Bottle Support, of metal, for bottles such as No. 49284 and No. 49304. Can be used either 
 vertically or horizontally 1.50 
 
 Weighing Bottle, Grethen, with ground in stopper, with glass stopcock. For weighing corrosive 
 liquids. Capacity 2 cc 2.00 
 
 Weighing Bottle. Hill, 30 cc, with ground in bulb, pipette and glass cap 1.50 
 
 Weighing Bottle, Lunge, with ground in stopper with bulb and two glass stopcocks. For weighing 
 corrosive liquids 3.50 
 
 Weighing BotHe, Mc Myn Patent, with glass cap ground on outside of neck, 25 cc capacity. Very 
 convenient because contents never interfere with the ground surface 50 
 
 100 
 
 23 
 .30 
 
 120 
 32 
 .40 
 
 70 
 35 
 
 80 
 45 
 
 .40 
 
 .50 
 
 30 
 60 
 
 30 
 70 
 
49.332. 
 
 49336. 
 
 49340. 
 
 49344. 
 
 49348. 
 49352. 
 49.350. 
 
 49.360. 
 
 49364. 
 49368. 
 
 49372. 
 49376. 
 493S0. 
 
 493S4. 
 49388. 
 
 49.396. 
 49400. 
 
 20 
 
 No. 493S0 No. 4939 
 
 Wire, Aluminum. B. & S. gauge 12 
 
 Peroz 08 
 
 Per lb 1.00 
 
 Wire, Soft Brass, wound on spools of i lb. each. 
 
 B. & S. gauge 16 18^ 
 
 Per spool 18 .18 .18 .20 .22 
 
 Wire, Copper, bare, wound on spool." of j lb. each. 
 
 B. & S. gauge 16^ 18 20_ 22_24_ 
 
 Per spool .18 .18 .18 .20 .22 " 
 
 Wire. German Silver, wound on spools of i lb. each. 
 
 B. & S. gauge _10 18_ 
 
 Per spool 35 .35 
 
 W'ire, Copper, single cotton coated, wound on spools of } lb. each. 
 
 B. & S. gauge 12 14 16 
 
 Per spool 20 ,20 .20 
 
 Wire, Copper, single silk coaled. B. & S. gauge , 1 2 ^ 14 16 _ 
 Per ounce 15 .1.5 .15 
 
 Wire, Iron, chemically pure for standardizing, containing 09.85' ; 1 
 
 16 
 
 .08 
 .00 
 
 1 
 
 IS 
 .10 
 .25 
 
 20 
 .10 
 1.25 
 
 
 .12 
 1.50 
 
 26 
 
 28 
 .28 
 
 30 
 
 32 
 
 34 
 .55 
 
 36 
 
 23 
 
 .35 
 
 .40 
 
 .85 
 
 26 
 
 28 
 
 30 
 
 32 
 
 34 
 
 36 
 
 23 
 
 .28 
 
 .35 
 
 .40 
 
 .55 
 
 .85 
 
 22 24 
 
 26 
 
 28 
 
 30 
 
 .45 .50 
 
 20 22 
 
 .50 
 24 
 
 .60 
 
 .70 
 
 30 
 
 .25 .25 
 
 20 22 
 
 .25 
 
 24 
 
 .30 
 
 27 
 
 .35 
 
 30 
 
 .15 .20 
 
 .20 
 
 .25 
 
 .30 
 .15 
 
 
 
 
 90 
 
 Wire, Pure Nickel. B. & S. gau^e 16 
 
 Per ounce 16 
 
 Per pound 2.10 
 
 Wire, Nichrome. This alloy is practically 
 
 IS 
 
 .17 
 2.15 
 
 .18 
 2.20 
 
 1^4 26 
 
 .19 .20 
 
 2.25 2.30 
 
 i-corrosive with an extremely high melting point, i 
 2800° F., and with a specific resistance equal to that of mercury. 
 
 B. & S. gauge.. 
 
 Per ounce 26 .28 
 
 Per pound 3.40 3.60 ■ 
 
 Wire, Nichrome, ribbon form, in widths from ■ 
 
 No. 14 to 40. Prices on application. 
 Wire Gauze. Brass, for general use. 
 
 Mesh 10 
 
 Per square foot .50 
 
 Wire Gauze, Copper, for combustion. Mesh. . 
 
 Per square foot 
 
 Wire Gauze, Iron. Mesh. 6 10 
 
 Per square foot 22 .27 
 
 Wire Gauze, Brass, in squares of iirnprr tbi( 
 
 flame. 8ize, inches 
 
 Per square 
 
 Wire Gauze, Nickel, 'M) mesh. 
 
 20 
 
 ^30 ^.35 
 .00 4.40 
 
 jnd to 1 i 
 
 .40 .45 .50 .55 .60 .75 
 4.85 5.40 6.00 6.80 7.70 9.50 
 
 ich and any thirkness from B. tt S. 
 
 1.30 
 16.50 
 
 .28 
 
 .32 
 
 40 
 60 
 
 60 
 .70 
 
 SO 
 1.00 
 
 10:) 
 1.45 
 
 40 
 
 60 
 
 so 
 
 100 
 
 60 
 
 .70 
 
 1.00 
 
 1.45 
 
 20 
 
 30 
 
 40 
 
 60 
 
 35 
 
 .37 
 
 .45 
 
 .70 
 
 iiicss and mesh for heating beakers, dishes, etc., ove 
 
 10 .15 .20 
 
 Per square foot 1,50 
 
 Wire Gauze, Nickel Chromium, of great durability because of the high heat resistinj; quality of this 
 
 alloy. Size, inches 4 
 
 Per square 40 
 
 Wire Gauze, Iron, in squares, for supporting dishes, etc. Size, inches 4 5 
 
 Per square 05 .06 
 
 Per dozen squares 50 .60 
 
 Wire Gauze, with Asbestos Center, of tinned iron wire, in squares. Size, ram 100 
 Per square, 12 
 
 Wire Gauze, Asbestos Covered, Carliczek, of brass but with each wire covered with ; 
 
 by a new process; very much more durable and economical of heat than those with asbcst' 
 
 Size, cm, , 
 
 center pressed on the wire gauze; in squares. 
 
 Per square 
 
 49404. Wire Gauze, as above, in circles with metallic binding. Diameter, cm 
 
 Per square 
 
 49408. Wire Gauze, of tinned iron wire, with hemispherical asbestos center. 
 
 Size, inches 
 
 _10_ 
 .35 " 
 
 10 
 
 5 
 
 6 
 
 .60 
 
 .80 
 
 6 
 
 3 
 
 .08 
 .80 
 
 .18 
 2.00 
 
 120 
 
 150 
 
 .15 
 
 .20 
 
 esto 
 
 with 
 
 12 
 
 coating 
 
 asbestos 
 
 15 
 
 .45 
 
 .50 
 
 Per square 45 
 
H. 
 
 H O 
 
 M 
 
 APPENDIX 
 
 Mendeleeff's Periodic System of llie Elements 
 
 Revised by Charles Baskerville 
 
 2 He = 3.98 
 
 3 Xe = 20.-2 
 
 y H- 1.008: 
 Li -6.94 Gl = 9.1 
 ,Na-23.00 iMg = 24.32 
 
 B = 11.0 
 Al=27.1 
 
 C- 12.00 
 Si = 2S.3 
 
 .\ . 14.01 
 p. 31.04 
 
 = 16.00 1'.19 
 S-32.07 Cl = 35.4ii 
 
 K.39.10 OI-40.07 !Sc~44.1 
 
 Cr.=.«.0 Mo-. 54. 93 
 
 Cu = 63.57 Zn = 65.37 C.a = 69.9 Go = 72.o .4s = 74.96 Se = 79.2 Br-79.92 
 
 r 
 
 Kr = S2.92 Rb = 85.4o Sr-S7.{ 
 
 Yt = 39.0 Zr = 90.0 Cb = 93.5 
 
 Mo = 96.0 
 
 ,\l!=107..S,S Cd=112.4 In = 114.8 .Sn- 119.0Sb-120.2 Te = 127.5 
 
 Cs = 132.Sl B;i-137.37 La = 139.0 Ce-140.2.5 (Pr.140.6) (Nd.144.3) 
 
 — — Er.167.7 ~ yb = 172,0 — 
 
 11 
 
 12 Nt- 222.4 
 
 Au-197.2 Hg = 200.0 Tl = 204.0Pb = 207.10 
 Ra = 226.4 i Th-232.4 
 
 Ta = lS1.5 W.1S4.0 — 
 Bi-20.S 
 
 Fe =55.84 
 |Co = 58.97 
 In; =58.68 
 
 (Cu) 
 
 Ru = 101.7 
 Rh-102.9 
 Pd - 106.7 
 
 .^(Ag) 
 
 ' Sa - 150.4 
 
 Eu=lo2 
 [Gd- 157.3 
 
 I Os = 190.9 
 !Ir =193.1 
 Ft = 195.2 
 
 (Au) 
 
 Rare earth metals not placed:— Dy = 162. 5, Lu=174, Tb = l.")9.2, Tm = 16S.5. 
 
 International Atomic Weights for 1913 * 
 
 = 10 
 
 Symbol 
 
 Aluminium I Al 
 
 Antimony I Sb 
 
 Argon ! A 
 
 Arsenic I As 
 
 Barium ' Ba 
 
 Bismuth Bi 
 
 Boron ! B 
 
 Bromine I Br 
 
 Cadmium Cd 
 
 Caesium Cs 
 
 Calcium Ca 
 
 Carbon C 
 
 Cerium Ce 
 
 Chlorine CI 
 
 Chromium I Cr 
 
 Cobalt I Co 
 
 Columbium Cb 
 
 Copper Cu 
 
 Dysprosium Dy 
 
 Erbium Er 
 
 Europium Eu 
 
 Fluorine F 
 
 Gadolinium Gd 
 
 Gallium Ga 
 
 Germanium Ge 
 
 Glucinum Gl 
 
 Gold Au 
 
 Helium : He 
 
 Atomic 
 
 Weight 
 
 27.1 
 
 120 2 
 
 39.88 
 
 74,96 
 
 137.37 
 
 208.0 
 
 11.0 
 
 79.92 
 
 112 40 
 
 132,81 
 
 40,07 
 
 12 on 
 
 140,25 
 
 35 46 
 
 52 
 
 58,97 
 
 93,5 
 
 153,57 
 
 162,5 
 
 167,7 
 
 152,0 
 
 19,0 
 
 167,3 
 
 69,9 
 
 72,5 
 
 9,1 
 
 197,2 
 
 3,99 
 
 L 1 Aiomic 
 byrabol ^.^ighl 
 
 Holmium Ho 
 
 Hydrogen H 
 
 Indium In 
 
 ■ Iodine I 
 
 Iridium Ir 
 
 Iron Fe 
 
 Krypton Kr 
 
 Lantiianum La 
 
 Lead Pb , 
 
 Lithium Li i 
 
 Lutecium Lu I 
 
 Magnesium Mg 
 
 Manganese Mn 
 
 Mercury Hg 
 
 Molybdenum Mo | 
 
 Neodymium Md ' 
 
 Neon Ne j 
 
 Nickel Ni | 
 
 Niton Nt I 
 
 Nitrogen N 
 
 Osmium Os 
 
 Oxygen O 
 
 Palladium Pd 
 
 Phosphorus P 
 
 Platinum Pt 
 
 Potassium K 
 
 Praseodymium Pr 
 
 Radium Ba 
 
 163.5 
 
 l.OOS 
 114.8 
 126.92 
 193.1 
 
 55.84 
 
 82.92 
 139.0 
 207.10 
 6.94 
 174.0 
 
 24.32 
 
 54.93 
 200.9 
 
 9G.0 
 144.3 
 
 20.2 
 
 58.68 
 222.4 
 
 14.01 
 190.9 
 
 16.00 
 106 7 
 
 31.04 
 195.2 
 
 39.10 
 140.6 
 226,4 
 
 Rhodium 
 
 Rubidium 
 
 Ruthenium 
 
 Samarium 
 
 Scandium. , 
 
 Selenium 
 
 Silicon 
 
 Silver 
 
 Sodium 
 
 Strontium. 
 
 Sulphur 
 
 Tantalum 
 
 Tellurium 
 
 Terbium 
 
 I, Thallium 
 
 :. Thorium 
 
 1 Thulium 
 
 ■ Tin 
 
 Titanium 
 
 Tungsten 
 
 Uranium 
 
 Vanadium 
 
 Xenon . , . 
 
 Ytterbium 
 
 (Neoytterbium) 
 
 Yttrium 
 
 Zinc 
 
 ; Zirconium 
 
 
 Atomic 
 
 jm ul 
 
 Weiifl,! 
 
 Eh 
 
 102,9 
 
 Kb 
 
 85.45 
 
 Ku 
 
 101.7 
 
 Sm 
 
 150.4 
 
 Sc 
 
 44.1 
 
 Se 
 
 79,2 
 
 Si 
 
 28,3 
 
 AR 
 
 107,88 
 
 Na 
 
 23,00 
 
 Sr 
 
 87,63 
 
 S 
 
 32,07 
 
 la 
 
 181,5 
 
 I'e 
 
 127,5 
 
 Tb 
 
 159,2 
 
 ri 
 
 204 
 
 Th 
 
 232,4 
 
 Tm 
 
 168,5 
 
 Sn 
 
 119,0 
 
 Ti 
 
 48,1 
 
 
 184,0 
 
 U 
 
 238 5 
 
 V 
 
 51 
 
 Xe 
 
 130 2 
 
 Vb 
 
 172,0 
 
 Yt 
 
 89 
 
 Zn 
 
 65.37 
 
 ir 
 
 90.6 
 
 * Compiled by the International Committee on Atomic Weights consisting of F. W. Clarke, W. Oatwald. 
 T. E. Thorpe, and G. Urbain. 
 
Comparison of Metric and Customary Units from 1 to 10* 
 
 LENGTHS 
 
 Inches 
 
 
 Millimeters 
 
 
 0.03937 
 
 _ 
 
 1 
 
 
 0,07874 
 
 = 
 
 2 
 
 
 0.11811 
 
 = 
 
 3 
 
 
 0.15748 
 
 = 
 
 i 
 
 
 0.19685 
 
 = 
 
 6 
 
 
 0.23622 
 
 = 
 
 6 
 
 
 27559 
 
 = 
 
 7 
 
 
 0.31496 
 
 = 
 
 8 
 
 
 35433 
 1 
 
 = 
 
 9 
 
 ■'.".4001 
 
 
 1 
 
 = 
 
 25.4001 
 
 ?. 
 
 = 
 
 50..S001 
 
 3 
 
 = 
 
 76 2002 
 
 4 
 
 = 
 
 101 . 0002 
 
 6 
 
 = 
 
 127-0003 
 
 6 
 
 = 
 
 152-4003 
 
 7 
 
 = 
 
 177.8004 
 
 « 
 
 = 
 
 203.2004 
 
 9 
 
 = 
 
 228.6005 
 
 0.3937 
 
 = 
 
 1 
 
 0.7874 
 
 = 
 
 2 
 
 1 
 
 = 
 
 2-54001 
 
 1-1811 
 
 — 
 
 3 
 
 1-574S 
 
 = 
 
 4 
 
 1.9685 
 
 = 
 
 6 
 
 2 
 
 ^ 
 
 5-08001 
 
 2.3622 
 
 = 
 
 6 
 
 2.7559 
 
 = 
 
 7 
 
 3 
 
 = 
 
 7.62002 
 
 3.1496 
 
 = 
 
 8 
 
 3.5433 
 
 = 
 
 9 
 
 4 
 
 = 
 
 10.16002 
 
 5 
 
 = 
 
 12.70003 
 
 6 
 
 = 
 
 15.24003 
 
 7 
 
 = 
 
 17.78004 
 
 8 
 
 = 
 
 20.32004 
 
 9 
 
 = 
 
 22 86005 
 
 
 Feet 
 
 
 Meters 
 
 1 
 
 ^ 
 
 0.304801 
 
 2 
 
 = 
 
 0.609601 
 
 3 
 
 = 
 
 0.914402 
 
 3.28083 
 
 = 
 
 1 
 
 4 
 
 = 
 
 1.219202 
 
 6 
 
 = 
 
 1.524003 
 
 6 
 
 = 
 
 1.828804 
 
 
 6.56167 
 
 = 
 
 2 
 
 
 7 
 
 = 
 
 2.133604 
 
 
 8 
 
 = 
 
 2-438406 
 
 
 9 
 
 = 
 
 2.743205 
 
 
 9.84260 
 
 = 
 
 3 
 
 
 13.12333 
 
 = 
 
 4 
 
 16.40417 
 
 = 
 
 6 
 
 19,68500 
 
 = 
 
 6 
 
 22.96583 
 
 = 
 
 7 
 
 26.24667 
 
 = 
 
 8 
 
 
 29.52750 
 
 = 
 
 9 
 
 S(u.re 
 
 
 
 
 
 Millimclc 
 
 0.00155 
 
 _ 
 
 1 
 
 0-00310 
 
 z= 
 
 2 
 
 0-00465 
 
 = 
 
 3 
 
 0.00620 
 
 = 
 
 4 
 
 0.00775 
 
 = 
 
 5 
 
 0.00930 
 
 = 
 
 6 
 
 0.01085 
 
 = 
 
 7 
 
 0.01240 
 
 = 
 
 8 
 
 0.01395 
 
 ^ 
 
 9 
 
 1 
 
 = 
 
 045.16 
 
 2 
 
 = 
 
 1,290 33 
 
 3 
 
 = 
 
 1,935 49 
 
 4 
 
 = 
 
 2,580.65 
 
 6 
 
 = 
 
 3,225 81 
 
 6 
 
 = 
 
 3,S70,9S 
 
 7 
 
 = 
 
 4,516 14 
 
 8 
 
 = 
 
 5,161.30 
 
 9 
 
 = 
 
 5,806.46 
 
 ches 
 
 Cei.tin.eie 
 
 0.1550 
 
 ^ 
 
 1 
 
 0.3100 
 
 = 
 
 2 
 
 0.4650 
 
 = 
 
 3 
 
 0.6200 
 
 = 
 
 4 
 
 0.7750 
 
 = 
 
 6 
 
 0.9300 
 
 = 
 
 6 
 
 1 
 
 = 
 
 6-452 
 
 1.0850 
 
 = 
 
 7 
 
 1.2400 
 
 = 
 
 8 
 
 1.3950 
 
 = 
 
 9 
 
 2 
 
 = 
 
 12-903 
 
 3 
 
 = 
 
 19.355 
 
 4 
 
 = 
 
 25.807 
 
 6 
 
 = 
 
 32.268 
 
 6 
 
 = 
 
 38.710 
 
 7 
 
 = 
 
 45.161 
 
 8 
 
 = 
 
 51 613 
 
 9 
 
 = 
 
 58 065 
 
 
 Square 
 
 
 Square 
 
 
 
 
 
 
 1 
 
 _ 
 
 0.09290 
 
 
 2 
 
 = 
 
 0.18581 
 
 
 3 
 
 = 
 
 0.27871 
 
 
 4 
 
 = 
 
 0.37161 
 
 
 5 
 
 = 
 
 0.46452 
 
 
 6 
 
 = 
 
 0.55742 
 
 
 7 
 
 = 
 
 0.65032 
 
 
 8 
 
 = 
 
 0.74323 
 
 
 9 
 
 = 
 
 0.83613 
 
 
 10.764 
 
 = 
 
 1 
 
 
 21.528 
 
 = 
 
 2 
 
 
 32.292 
 
 = 
 
 3 
 
 
 43-055 
 
 = 
 
 4 
 
 
 53-819 
 
 = 
 
 6 
 
 
 64.583 
 
 = 
 
 6 
 
 
 75.347 
 
 = 
 
 7 
 
 
 86.111 
 
 =^ 
 
 8 
 
 
 96.875 
 
 = 
 
 ' 
 
 0.000061 
 
 = 
 
 1 
 
 
 0.000122 
 
 = 
 
 2 
 
 0.000183 
 
 = 
 
 3 
 
 
 0.000244 
 
 = 
 
 4 
 
 
 0.000305 
 
 = 
 
 5 
 
 
 000366 
 
 = 
 
 6 
 
 
 0.000427 
 
 = 
 
 7 
 
 
 000483 
 
 = 
 
 8 
 
 
 0.000549 
 
 = 
 
 9' 
 
 1 
 
 = 
 
 16,387,2 
 
 2 
 
 = 
 
 32,774 3 
 
 3 
 
 = 
 
 49,161,5 
 
 4 
 
 = 
 
 65,548 6 
 
 
 5 
 
 = 
 
 81,935 8 
 
 
 6 
 
 = 
 
 98,323 
 
 
 7 
 
 = 
 
 114,710 1 
 
 8 
 
 — 
 
 131,097 3 
 
 9 
 
 1 
 
 147,484 5 
 
 VOLU 
 
 MES 
 
 
 
 
 ruble 
 
 Cubic Cubic 
 
 Inehes 
 
 '-■'"'""""' 
 
 
 Feet Meters 
 
 0.0610 - 
 
 1 
 
 
 1 = 0.02832 
 
 0.1220 = 
 
 2 
 
 
 2 = 0.05663 
 
 0.1831 - 
 
 3 
 
 
 3 = 0.08495 
 
 0.2441 = 
 
 4 
 
 
 4 = 0.11327 
 
 3051 = 
 
 6 
 
 
 6 =0 14169 
 
 0.3661 = 
 
 6 
 
 
 6 - 0,16990 
 
 4272 - 
 
 7 
 
 
 7 = 0,19822 
 
 0.4882 = 
 
 8 
 
 
 8 = 0,22654 
 
 0.5492 - 
 
 9 
 
 
 9 = 0,25485 
 
 1 
 
 16.3872 
 
 
 35,314 = 1 
 
 2 
 
 32.7743 
 
 
 70-629 = 2 
 
 3 
 
 49.1615 
 
 
 105-943 = 3 
 
 4 
 
 05 5486 
 
 
 141.258 = 4 
 
 6 
 
 ,81.9358 
 
 
 176.572 = 6 
 
 6 
 
 98 3230 
 
 
 211-887 - G 
 
 7 
 
 114.7101 
 
 
 247-201 = 7 
 
 8 
 
 131.0973 
 
 
 282.516 = 8 
 
 9 
 
 147 4845 
 
 
 317.830 = 9 
 
 * Table of Equivalents, XJ. S. Bureau of Standards. 
 
CAPACITIES 
 
 iillilitcra 
 
 
 U.S. Liquid 
 
 
 
 
 Ouncea 
 
 
 1 
 
 ^ 
 
 0.03381 
 
 
 2 
 
 = 
 
 0.06703 
 
 3 
 
 = 
 
 0.10144 
 
 4 
 
 = 
 
 0.13526 
 
 6 
 
 = 
 
 0.16907 
 
 6 
 
 = 
 
 0.20288 
 
 7 
 
 = 
 
 0.23670 
 
 8 
 
 = 
 
 0.27051 
 
 9 
 
 = 
 
 301.3> 
 
 29.574 
 
 = 
 
 1 
 
 59.147 
 
 = 
 
 2 
 
 88.721 
 
 = 
 
 3 
 
 118.295 
 
 = 
 
 4 
 
 
 147.869 
 
 = 
 
 6 
 
 
 177.442 
 
 = 
 
 6 
 
 
 207.016 
 
 = 
 
 7 
 
 
 236.590 
 
 — 
 
 8 
 
 
 266.163 
 
 = 
 
 9 
 
 
 illilitcrs 
 
 TI 
 
 S.Apolhe. 
 
 (cc.) 
 
 car 
 
 
 1 
 
 _ 
 
 0.2705 
 
 2 
 
 = 
 
 0.5410 
 
 3 
 
 = 
 
 0.8115 
 
 3.0007 
 
 = 
 
 1 
 
 1 
 
 = 
 
 1.0820 
 
 6 
 
 = 
 
 1.3.'y25 
 
 6 
 
 = 
 
 1 6231 
 
 7 
 
 = 
 
 1.8936 
 
 7.3934 
 
 = 
 
 2 
 
 8 
 
 = 
 
 2.1641 
 
 9 
 
 = 
 
 2.4346 
 
 11.0901 
 
 = 
 
 3 
 
 14.7869 
 
 = 
 
 4 
 
 18.4836 
 
 — 
 
 6 
 
 22.1803 
 
 = 
 
 6 
 
 25.8770 
 
 ~ 
 
 7 
 
 29.5737 
 
 = 
 
 8 
 
 33.2704 
 
 = 
 
 9 
 
 U.S Apolh 
 
 P. 
 
 Miltilitera 
 
 ariea' Scruplea 
 
 Icc.j 
 
 8115 
 
 ^ 
 
 1 
 
 1 
 
 = 
 
 1 2322 
 
 1.6231 
 
 = 
 
 2 
 
 2 
 
 = 
 
 2.4645 
 
 2.4346 
 
 = 
 
 3 
 
 3 
 
 = 
 
 3 6967 
 
 3.2461 
 
 = 
 
 4 
 
 4 
 
 = 
 
 4.9290 
 
 4.0577 
 
 = 
 
 5 
 
 4.8692 
 
 = 
 
 6 
 
 5 
 
 = 
 
 6.1612 
 
 5 6807 
 
 = 
 
 7 
 
 6 
 
 = 
 
 7.3934 
 
 6.4923 
 
 = 
 
 8 
 
 7 
 
 = 
 
 8.6257 
 
 7 3038 
 
 = 
 
 9 
 
 8 
 
 = 
 
 9.8.579 
 
 9 
 
 = 
 
 11.0901 
 
 1 
 
 = 
 
 0.06480 
 
 2 
 
 = 
 
 0.12960 
 
 3 
 
 — 
 
 0.19440 
 
 4 
 
 = 
 
 0.25920 
 
 5 
 
 = 
 
 0.3''399 
 
 6 
 
 = 
 
 0.3S879 
 
 7 
 
 = 
 
 0.45359 
 
 8 
 
 = 
 
 0.51839 
 
 9 
 
 = 
 
 0.58319 
 
 15.4324 
 
 = 
 
 1 
 
 30.8647 
 
 = 
 
 2 
 
 46.2971 
 
 = 
 
 3 
 
 61.7294 
 
 = 
 
 4 
 
 77.1618 
 
 = 
 
 6 
 
 92.5941 
 
 = 
 
 6 
 
 108.0265 
 
 = 
 
 7 
 
 123.45.89 
 
 = 
 
 8 
 
 138.8912 
 
 = 
 
 9 
 
 0.03527 
 
 = 
 
 1 
 
 0.07055 
 
 = 
 
 2 
 
 0.10682 
 
 = 
 
 3 
 
 0.14110 
 
 = 
 
 4 
 
 0.17637 
 
 — 
 
 6 
 
 0.21164 
 
 = 
 
 6 
 
 0.24692 
 
 = 
 
 7 
 
 0.28219 
 
 — 
 
 8 
 
 0.31747 
 
 = 
 
 9 
 
 1 
 
 = 
 
 28.3495 
 
 2 
 
 = 
 
 56.6991 
 
 3 
 
 = 
 
 85.0486 
 
 4 
 
 = 
 
 113.3981 
 
 5 
 
 = 
 
 141.7476 
 
 6 
 
 = 
 
 170.0972 
 
 7 
 
 = 
 
 198.4467 
 
 8 
 
 = 
 
 226.7962 
 
 9 
 
 = 
 
 255.1457 
 
 Tro, 
 Ouncaa 
 
 
 Grama 
 
 0.03215 
 
 ^ 
 
 1 
 
 0.06430 
 
 = 
 
 2 
 
 0.09645 
 
 = 
 
 3 
 
 0.12860 
 
 — 
 
 4 
 
 0.16075 
 
 = 
 
 5 
 
 0.19290 
 
 = 
 
 6 
 
 0.22506 
 
 — 
 
 7 
 
 0.25721 
 
 = 
 
 8 
 
 0.28936 
 
 = 
 
 9 
 
 1 
 
 = 
 
 31 . 10348 
 
 2 
 
 — 
 
 62.20696 
 
 3 
 
 = 
 
 93.31044 
 
 4 
 
 = 
 
 124.41392 
 
 5 
 
 = 
 
 1.55.51740 
 
 6 
 
 = 
 
 186.6208S 
 
 7 
 
 = 
 
 217.72437 
 
 8 
 
 = 
 
 248.82785 
 
 9 
 
 = 
 
 279.93133 
 
 
 "'sar ™«™= 
 
 
 Troy Pounds Kilograms 
 
 1 - 0.45359 
 
 1 = 0.37324 
 
 2 = 0.90718 
 
 
 2 = 0.74648 
 
 2.20462 = 1 
 
 
 2.67923 = 1 
 
 3 = 1.36078 
 
 
 3 = 1.11973 
 
 4 = 1.81437 
 
 
 4 - 1.49279 
 
 4.40924 - 2 
 
 
 6 = 1.86621 
 
 6 = 2.26796 
 
 
 5.35846 - 2 
 
 6 - 2.72155 
 
 
 6 - 2 23945 
 
 61387 - 3 
 
 
 7 - 2 61269 
 
 7 - 3.17515 
 
 
 8 - 2.98593 
 
 
 8 - 3.62874 
 
 
 8.03769 = 3 
 
 
 S.S1849 - 4 
 
 
 9 = 3.35918 
 
 
 9 - 4.08233 
 
 
 10.71691 - 4 
 
 
 11.02311 - 6 
 
 
 13.39614 = 5 
 
 
 13.22773 = 6 
 
 
 16.07537 - 6 
 
 
 15.43236 - 7 
 
 
 18.75460 - 7 
 
 
 17 63698 = 8 
 
 
 21.433.83 = 8 
 
 
 19.84160 - 9 
 
 
 24.11306 = 9 
 
INDEX 
 
 An endeavor has been made to make this index very complete in that articles are indexed under the 
 principal words of the name and in addition imder the author's name, thus, "Blair's Water Bath" will be found 
 under "Bath, Water, Blair," "Water Bath, Blair" and "Blair Water Bath." As the authors' names are printed 
 in heavy face type and in alphabetical sequence, the usual Authors' Index is omitted. 
 
 A 
 
 Abati Drying Oven 375 
 
 Abbe Apertometer 324 
 
 " Camera Lucida, B. & L.. . 316 
 " " Zeiss.... 324 
 
 " Condensers, B. & L 315 
 
 " " Zeiss 320 
 
 " Microspectroscope 324 
 
 " Refractometer 466 
 
 " Spectral Ocular 324 
 
 " Stereoscopic Ocular 324 
 
 Abderhalden Animal Cage 11 
 
 " Apparatus for Di- 
 
 alyzing Method... 177 
 " Apparatus for Op- 
 
 tical Methotl. , , .428 
 " Cylinder for lly- 
 
 draulie Pros.s. , . !. 437 
 Diffusion Shells.. 177 
 " Electric Heating 
 
 Device for Polari- 
 
 scopes 428 
 
 Flasks and Tubes. 177 
 " Polariscope 
 
 Tubes 428, 434 
 
 " Reagents 177 
 
 Test Tube 177 
 
 " Tongs 177 
 
 Water Bath 177 
 
 Abel-Pensky Flash Point Test- 
 ers 368 
 
 Absorption Blocks 1 
 
 " Cells for Spectros- 
 copy 504 
 
 Tube, Folin 543 
 
 Accumulators 66, 67 
 
 Acetoraeter, Otto 1 
 
 Acetylene Burner 92 
 
 Gas Tank 441 
 
 Aeetylization Flask 218 
 
 Achromatic Objectives, Zeiss.. 321 
 " Substage Conden- 
 sers, B. & L 315 
 
 " Substage Conden- 
 sers, Zeiss 320 
 
 Acid Basins 1 
 
 " Bottle and Pipette com- 
 bined 350 
 
 " Burette for Milk Testing, 350 
 " Measure " " " 350 
 
 " Pitchers 1 
 
 " Pumps ] 
 
 Ackermann Automatic Reckon- 
 er 351 
 
 Acme Safety Burners 92 
 
 Adam Galactometer 351 
 
 Adapters for Retorts 1 
 
 Adhesion Machine Kirchbraun- 
 
 Sargent 15 
 
 Adhesive Tape 75 
 
 Adiabatic Calorimeter, Riche. . 104 
 Adjustable Oculars, Zeiss. ..... 264 
 
 " Supports for Physio- 
 logical Work. ..,401,402 
 Agar Filter Paper 216 
 
 Page 
 
 Agate Mortars 362 
 
 Air Compres.sors 1 to 6 
 
 Air Liquefying.'Vpparatus 285 
 
 Air ilelting Point Oven 18 
 
 Air Pumps 1 to 6 
 
 Air Pump Plates 6 
 
 " '* Receivers 71 
 
 " Sampler 7 
 
 " Tester, Wolpert 7 
 
 " Warmer and Anaesthetic 
 
 Bottle 403 
 
 Albuminometers 543 
 
 Alcohol Blast Burners, Barthel 95 
 
 " Burner 97 
 
 " Lamps 283 
 
 Stoves, Barthel 98 
 
 Alcoholometers (Hydrometers). 273 
 
 Alembics 465 
 
 Alexander Glue and Gelatine 
 
 Tester 261 
 
 " Viscosity Pipette. , , 261 
 Aliphatic Amino Group Appa- 
 ratus, Van Slyke 367 
 
 Alkalimeters 7 
 
 Alkalinity Flask, Volumetric. , , 224 
 Allen & Moyer Orsat Gas Analy- 
 sis Apparatus — 245 
 
 Allihn Condenser 152 
 
 " Gas Washing Bottles, ,. . 251 
 " Normal Thermometers . . 532 
 Alpha Ray Electroscope, Ru- 
 therford 464 
 
 Alsop Drying Oven 380 
 
 Aluminum Beakers 68 
 
 Dishes ISO 
 
 " Screen, Zeiss 448 
 
 " Shields for Centri- 
 fuge Tubes 115, 116 
 
 " Weighing Dish with 
 
 Counterpoise 180 
 
 Wire 554 
 
 Alundum Combustion Boats , . . 149 
 Tubes,,, 149 
 
 Crucibles 157, 160 
 
 " Dish for Incinerations 178 
 
 " Extraction Thimbles , 205 
 
 Filter Cones 213 
 
 " Discs 212 
 
 " " Dish 213 
 
 " Filtering Crucibles. . . 160 
 
 Muffles 364 
 
 " Pyrometer Tubes .... 458 
 
 " Refractory Cement. . 7 
 
 RR 149 
 
 " Tubes 7 
 
 Amberg Swimming Cups 515 
 
 Ammeters and Milliame- 
 
 ters 200 to 202 
 
 Ammonia Nitrogen and Urea in 
 Urine, Folin's Ap- 
 paratus for 543 
 
 Still 190 
 
 " Trap for Folin's Ap- 
 paratus . 543 
 
 Ampoules 7 
 
 Ampoule Scaling Burner 96 
 
 Page 
 Anaerobic Culture .Apparatus. 8 
 Anaesthetic Bottle and Air 
 
 Warmer, Brodie 403 
 
 Anaesthetizing Valves 403 
 
 Analytical Balances 46 to 51 
 
 Weights 62 to 64 
 
 Analyzer for Curves, .Taquet.,, 408 
 " " Micro Polarisation 317 
 Anastigmatic Magnifiers, Zeiss 288 
 Anatomical Charts, Human, 
 
 Lendenfeld 124 
 
 Models (9 
 
 Anderson Petersen - Palmquist 
 
 Gas Analysis Apparatus 249 
 
 Anemometers 10 
 
 Aneroid Barometers 65 
 
 Angle Thermometers 534 
 
 Animal Balance 10 
 
 " Bladders 73 
 
 " Board 10 
 
 " Cages 10, 11 
 
 " Holders 11, 12 
 
 " -Jars 11, 12 
 
 " Table, Brodie 12 
 
 Annealing Cups 12 
 
 Anodes, Platinum 420 
 
 Anoxyscope 416 
 
 Anschiitz Normal Thermometers 532 
 
 Antitoxin Culture Flask 171 
 
 Anvils 13 
 
 Apertometer, Abbe 324 
 
 Aplanatic Substage Condenser, 
 
 B. &L 315 
 
 " Substage Condenser, 
 
 Zeiss,,: 320 
 
 Triplets _,- 287 
 
 Apoehromatic Objectives, Zeiss 321 
 Appliances, Measuring . . . 290 to 296 
 Application Goniometer, Pen- 
 
 feld 352 
 
 Aprons 13 
 
 " Asbestos 14 
 
 Aquaria 13 
 
 Arc Furnaces, Electric 241 
 
 " Lamp, Mercury Vapor, Her- 
 
 aeus 503 
 
 " " for Microscopes. . , . 331 
 Mer- 
 cury Vapor 332 
 
 " " for Photo - Micro- 
 graphic Apparatus 
 
 Weule 340 
 
 " " for Projection Ap- 
 paratus 447 
 
 Areo-Pycnometer, Saxe 273 
 
 Argand Burner 91 
 
 Armored Thermometers 534 
 
 Arnold Steam Sterilizers 41 
 
 Arons Chromoscope 146 
 
 Arrhenius Conductivity Cells. . 390 
 Arsem Electric Vacuum Fur- 
 nace 242 
 
 Arsenic Apparatus 14 
 
 Tubes 14 
 
 Artery Canulae 402 
 
 " Scissors 184 
 
Artificial Respiration Pumps 402,403 
 Asbestos Aprons, Board, Ce- 
 ment, Cord, Gloves, 
 
 Mats and Paper 14 
 
 " Wire Gauze 554 
 
 Asphalt and Tar Testing Appa- 
 ratus 15 to 19 
 
 " Hydrometer 273 
 
 " Thermometer .534 
 
 Aspirator Bottles 7.5 
 
 Aspirator (Syringe) 519 
 
 Assay Balances 52, 53 
 
 " Combination Furnace, 
 
 Brown 235 
 
 " Crucibles 156,1.57 
 
 " Flasks 21S 
 
 " Mill IGl 
 
 " Ton Weights 63 
 
 Atomic Weight Charts 130 
 
 " Weights for 1913 555 
 
 Atom Models 19 
 
 Atwater Bomb Calorimeter 105 
 
 " Dessiccator 175 
 
 Autoclave, Force, for Cement. . Ill 
 " for chemical Diges- 
 
 tion.s (Digesters).... 20 
 " Steam Pressure Ster- 
 ilizers 37, 38 
 
 Autocollimation Spectroscope, 
 
 Zeiss 500 
 
 "Autogenor" Gas Generator. . . 254 
 
 Automatic Burettes 87, 88 
 
 " Laboratory Micro- 
 tome 343 
 
 Pipettes 412 
 
 " Precision Microtome 344 
 
 " Reckoner, Acker- 
 
 mann 351 
 
 " Respirators 47-^ 
 
 " Shutter for Micro- 
 Photographic Appa- 
 ratus 338 
 
 .A.u\ograph 416 
 
 Axial-angle Apparatus, Wiilfing 353 
 
 B 
 
 Babcock Bottles 350 
 
 Milk Testers 349, 350 
 
 " Pipette 350 
 
 Bacteria Counting Apparatus . . 155 
 " Grinding Appara- 
 tus 166 to 169 
 
 Bacteriological Apparatus . .21 to 45 
 
 " Charts.... ^ 125 
 
 " Fermentation 
 
 Tubes 209 
 
 " Filter Appara- 
 
 liis 209 to 211 
 
 Incubators.. 21 to 33 
 " Syringes, .516 to 519 
 
 Bagasse Cutter 297 
 
 Bags, Filter 211 
 
 " -Gas 250 
 
 Baier Thermometer 466 
 
 Bailey Crucible Holder 160 
 
 Bain Washing Apparatus for 
 
 Microscopic Material 546 
 
 Baker & Adamson Filter Paper 213 
 
 Balances 46 to 61 
 
 Analytical 46 to 51 
 
 for Animals 10 
 
 Assay 52, 53 
 
 for Cloth Testing 529 
 
 Counter 59 
 
 Balances Cream Test 351 
 
 " Decimal 54 
 
 " Dispensing 59 
 
 Gas, Lux 250 
 
 Hand 58 
 
 Jolly Spiral Spring ... 58 
 
 Lecture Table 54 to 56 
 
 " Magnalium 57 
 
 Micro ,53 
 
 Moisture 59, 61 
 
 " Prescription 56, .57 
 
 Pulp 56, 57 
 
 Soil 61 
 
 Solution 59, 60 
 
 " Specific Gravity 58 
 
 Torsion " 60 
 
 " Transpiration 418 
 
 Trip 59 
 
 " Triple Beam . 58 
 
 Balance Cover 64 
 
 " Pans 64 
 
 " Reading Glass 64 
 
 " Rests 64 
 
 Riders 64 
 
 " Supports of Glass 64 
 
 Weights 62 to64 
 
 Ball Mills 166 
 
 Balloons 65 
 
 for Filtering, Pukal . . 210 
 
 " Gas 250 
 
 Balopticons and Accessories . . . 439 
 
 Balsam Bottles 76 
 
 Baly Spectrum Tube 505 
 
 Band Tubing, Rubber 480 
 
 Barcroft-Haldane-Plesch Ap- 
 paratus for Determining the 
 Oxygen Capacity and Car- 
 bonic Acid Content of the 
 
 Blood 405 
 
 Barcroft-Roberts Apparatus for 
 Determining Differential 
 
 Pressure of Blood Gases 405 
 
 Bardeen Freezing Microtome . . 346 
 Barkometers (Hj'drometers) . . . 273 
 
 Bar Magnets 286 
 
 Barnes Dissecting Microscope. , 313 
 
 Barnstead Stills 188 
 
 Barometers 65 
 
 Barometer Tubes 65 
 
 " Tubing 260 
 
 Barrett Mfg. Co. Standard Ap- 
 paratus for Testing Coal Tar 
 and Refined Tars, Oils and 
 Pitches Derived thereform.. 18 
 
 Barthel Alcohol Stoves 98 
 
 " Automatic Burners .... 95 
 
 Basins, Acid 1 
 
 Baskets for Test Tubes 522 
 
 Bates Polariscope Tubes 431 
 
 " Sugar Flask 226 
 
 " " Polariscope 431 
 
 Baths, Constant Tempera- 
 ture ...392, 393 
 
 " Paraffine Embedding . , , 43 
 
 " Sand 480 
 
 " Vaccine Culture, Wasser- 
 
 man Test, etc 34,35 
 
 Water 548 to 552 
 
 " "for Abderhalden 
 
 Dialyzing Method 177 
 
 Batteries, Dry 66 
 
 " Primary 65, 66 
 
 Storage 66, 67 
 
 Battersea Crucibles 157 
 
 Muffles 364 
 
 Page 
 
 Battersea Roasting Dislies .... 475 
 
 " Scorifiers 481 
 
 Battery for Charging Electro- 
 scopes 460 
 
 " Connectors 68 
 
 " Jars 68 
 
 Baume Hydrometers 271 
 
 Bausch & Lomb Micro-Photo- 
 graphic Ap- 
 paratus . .337 to 339 
 " " Microscopes 
 
 and Acces- 
 sories.... 304 to 317 
 " " Micro Arc 
 
 " " Lamp 331 
 
 " " Microtomes 
 
 and Acces- 
 sories . . .343 to 348 
 " " Petrographical 
 
 Microscope 
 
 3.55 to 357 
 " " Projection 
 
 Apparatus 
 and Acces- 
 sories . . 439 to 448 
 
 Beads, Glass 258 
 
 Beakers, Aluminum. . , 68 
 
 " Copper 68 
 
 " Enamel Ware 68 
 
 " Glass 69 to 71 
 
 " Griffins 69 
 
 Phillips 71 
 
 " Porcelain 68 
 
 " Transparent Quartz . . 4.59 
 
 Beaker Clamps 1 42 
 
 Bechhold Ultrafiltration Ap- 
 paratus 212 
 
 Ultra Filter Discs.... 212 
 Beckmann Molecular Weight 
 " Determination Ap- 
 paratus 388, 389 
 
 " Spectrum Burner . , . 502 
 
 " Thermometers 533 
 
 Beehive for Pneumatic Troughs 423 
 
 Beet Sugar Polariscopes 433 
 
 Bell Glasses 71,72 
 
 " Jars 71, 72 
 
 Bench, Photometer, Stationary 384 
 
 Bending Tubing, Glass 260 
 
 Bennert Manometer 289 
 
 Benzene Blast Burners, Bar- 
 thel 95 
 
 " Hydrometer 273 
 
 Bergmann Stability Test Appa- 
 ratus 508 
 
 Berkefeld Filters 210 
 
 " Pressure Filter 211 
 
 Berkshire Sand 552 
 
 Bernhard Drawing Table 324 
 
 Berzelius Gas Holder 253 
 
 Berzelius-Pepys Gas Holder. . 253 
 Beta and Gamma Ray Electro- 
 scope, Rutherford, . , . 464 
 
 Beutel Burette Float 88 
 
 Bibulous Paper 216 
 
 BilB-Brooks Coagulometer .... 266 
 Binding Posts for Batteries. ... 68 
 
 " " Ostwald .394 
 
 Binoculars, Bausch & Lomb- 
 
 Zeiss Stereo 72 
 
 Binocular Microscope for Pair- 
 ed Objectives, B. &L. 312 
 
 Binocular Microscope Chun 330 
 
 " Zeiss 325 
 
 Biram Anemometer 10 
 
Fage 
 
 Bitumen Holder 15 
 
 Bladders, Animal 73 
 
 Biair Drying Oven 379 
 
 " Platinum Combustion 
 
 Boats 421 
 
 " Platinum Dish 422 
 
 " Stirring Apparatus 509 
 
 " Water Bath 548 
 
 Blake Pinning Forceps 227 
 
 Blast Blowers 73 
 
 " Burners 94 to 96 
 
 Blocks for Absorption 1 
 
 of Red Fibre 348 
 
 " for Staining Jars 507 
 
 Block Strop for Microtome 
 
 Knives 348 
 
 " Tin Pipe 412 
 
 Blood Apparatus for Oxygen 
 Capacity and Carbonic 
 Acid Content, Barcroft 
 
 and Haldane 405 
 
 " Capsules, Wright 267 
 
 " Collector, Vacuum 267 
 
 " Counting Apparatus 
 
 262 to 264 
 " Gas Apparatus for Differ- 
 ential Pressure 405 
 
 " Lancets 267 
 
 " Pipette, Wright 267 
 
 " Pipettes for Haemacytom- 
 
 eters 263 
 
 " Testing Apparatus . 262 to 266 
 Blowers, Crowell Positive Pres- 
 sure 73 
 
 Foot 73 
 
 " Pressure 73 
 
 Blowpipes 74 
 
 " for Zoological Work. 181 
 
 Blowpipe Charcoal 74 
 
 Set, Butler 74 
 
 " Tips, Platinum 422 
 
 Blowpiping Forceps 227 
 
 " Mattrasses 286 
 
 Blue Flame Burners 93 
 
 " Green Hones 348 
 
 Board, Asbestos 14 
 
 Boas Dish for Feces Experi- 
 ments 177 
 
 Hoggs Coagulometer 266 
 
 Bohr Experimental Gas Meter 404 
 
 Boilers (Saucepans) 75 
 
 Boiler, Steam 508 
 
 Boiling Flasks 219, 220 
 
 Boiling Point Apparatus 389 
 
 " Tubes 389 
 
 Bolting Cloth 75 
 
 Bone Saw - 182 
 
 " Spatulas 490 
 
 " Spoons 506 
 
 Book of Labels 283 
 
 Boot Specific Gravity Bottle... 491 
 
 Borer, Soil 490 
 
 Borrel Grinding Apparatus for 
 
 Organic Tissues 169 
 
 Boston Slide Forceps 228 
 
 Botanical Charts 126 to 129 
 
 " Supplies 75 
 
 Bottcher Counting Apparatus, . 156 
 
 Bottles 78, 79 
 
 Aspirator 75, 76 
 
 Balsam 76 
 
 Cedar Oil 77 
 
 Dropping 76, 77 
 
 Ether 84 
 
 Gas, Cubic Foot 255 
 
 Bottles, Gas, Generating 250 
 
 " Washing 250, 251 
 
 Graduated 84 
 
 Hard Rubber S4 
 
 Immersion Oil 77 
 
 Milk Testing 350 
 
 Oil Sample 84 
 
 Mixing 173 
 
 Percolator 382 
 
 Pressure 84 
 
 Reagent 80 to 83 
 
 Specific Gravity 491, 492 
 
 " " Barrett 
 
 Hubbar<i 18 
 
 Specimen 77 
 
 for Sputum Specimens.. 506 
 
 Washing 546 
 
 Water Sample 84 
 
 Weighing 553 
 
 Woulff 84 
 
 Bottle Caps 180 
 
 Bougies, Filtering 210 
 
 Bowen Potash Bulb 436 
 
 Bowls, Enamel Ware 180 
 
 Boxes, Pasteboard 85 
 
 " Tin 85 
 
 " Wood 85 
 
 " for Culture Dishes 171 
 
 " " Filter Paper 216 
 
 " " Micro Slides 335 
 
 " " Paraffine Embedding 348 
 
 " " Pipettes 415 
 
 Boxwood Rule 290 
 
 Boyce Acme Safety Burner 92 
 
 " Adjustable Burner 92 
 
 Brain Jars 280 
 
 " Knife 181 
 
 " Microtome, Sartorius. . . . 345 
 
 Brass Sieves 486, 487 
 
 " Stopcocks 510 
 
 " Wire 554 
 
 Braun Crushers 163, 164 
 
 " Planetary Pulverizers, . . 163 
 
 " Sample Grinders 162 
 
 " Sieve Shakers 487, 488 
 
 Breuer Haemacytometer. .262 to 264 
 
 Bridges, Slide Wire 393, 394 
 
 Briquette Mould for Asphalt. . . 15 
 " " " Cement. . . Ill 
 
 Brinell Hardness Tester 268 
 
 " " Test Measur- 
 ing Micro- 
 scope 295 
 
 Brinton-Reischauer Specific 
 Gravity 
 
 Bottle 491 
 
 Brix Hydrometer 271 
 
 Brodie Anaesthetic Bottle and 
 
 Air Warmer 403 
 
 Anhnal Table 12 
 
 " Kymograph 398 
 
 " Respiration Pump 402 
 
 Brodie-Russell-Boggs o a g u - 
 
 lometer.- 266 
 Bromwell Fusel Oil Apparatus, 245 
 Brown Assayer's Combination 
 
 Furnace 235 
 
 " Pyrometers 450 
 
 Brownite Cupels 172 
 
 Briicke Combination Lens 288 
 
 Bruehl Receiver 465 
 
 Bruneau Syringes 518 
 
 Brushes 85, 86 
 
 " for Cement 114 
 
 Buchner Funnels 229 
 
 " Hydraulic Press 437 
 
 Buck Iron Mortar 362 
 
 Bucket, for Waste 546 
 
 Bucking Board 161 
 
 Bulbs, Connecting, Kjeldahl.. , . 366 
 " Levelling for Gas Bu- 
 rettes 251 
 
 Nitrogen 366 
 
 " Resistance 453, 454 
 
 " Rubber 475, 476 
 
 Bulb Connecting Tube for Mar- 
 shall Urea in Blood Appa- 
 ratus 266 
 
 Bulls-Eye Condenser, B. & L., . 317 
 
 Bumstead Electroscope 463 
 
 Bunsen Blast Burners 94 
 
 Burners 91, 92 
 
 Clamps 140 
 
 Eudiometers 205 
 
 Funnels 228 
 
 Gas Washing Bottles... 250 
 
 Bunte Gas Burettes 251 
 
 Bureau of Mines Flash Point 
 
 Testers 369 
 
 Burettes 86 to 89 
 
 for Acid in Milk Test . 350 
 
 " Automatic 87, 88 
 
 Calibrating 88 
 
 Certified 89 
 
 " Dispensing 88 
 
 Gas 251 
 
 " Precision. 89 
 
 " Saponification 88 
 
 Burette Attachments 86 
 
 Caps 88 
 
 Clamps 141, 143 
 
 Floats 88 
 
 " Funnel 88 
 
 " Meniscus Reader 88 
 
 " Supports, , 90 
 
 Biirker Fluid Chamber 263 
 
 " Haemacytometer, 262to 264 
 
 Burner, Acetylene 92 
 
 " Acme Safety 92 
 
 " Adjustable 92 
 
 Alcohol 97 
 
 " Argand 91 
 
 Barthel 95, 98 
 
 Blast 94to96 
 
 Blue Flame 93 
 
 Boyce 92 
 
 Bunsen 91, 92 
 
 Chaddock 92 
 
 Combustion Tube 94 
 
 " Dangler 97 
 
 Detroit '. . 92 
 
 " Eureka 94 
 
 " Evaporating 96 
 
 Fletcher Radial 97 
 
 Safety 93 
 
 Solid flame.., 98 
 
 [Gas Stoves) 97 
 
 Gauze Top 97 
 
 " Greemnan 94 
 
 " High Temperature .... 93 
 " Hydro Carbon for Kero- 
 sene 97 
 
 " Janus Blast 96 
 
 Koch Safety 98 
 
 " Low Temperature 97 
 
 Micro 91 
 
 Multiple Tube 91 
 
 Pilot Light 91 
 
 Porcelain 92 
 
Burner King Funn 94 
 
 " " " for tar Test- 
 ing 18 
 
 " Sargent High Tempera- 
 ture 93 
 
 " Scimatco Patent 93 
 
 " Spectrum 502 
 
 Teclu 93 
 
 Tirrill 92 
 
 " Universal 92 
 
 " Attachments 94 
 
 Guard 94 
 
 Burrell Gas Analysis Appara- 
 tus 247 
 
 Busz Rhombohedron 358 
 
 Butler Blowpipe Set 74 
 
 Butter Refractoraeter 466 
 
 Button Pliers 423 
 
 Buxton-Beebe-Taylor Diving 
 
 A|i|jaraTus 194 
 
 G 
 
 Cabinets for Micro Slides 336 
 
 Cadmium Normal Elements. . . . 396 
 
 Cages for Animals 10, 11 
 
 Calcimeters 99 
 
 Calcium Chloride Cylinders. ... 99 
 Drying Tubes 99 
 
 Holders 99 
 
 Tubes 99,100 
 
 Caldwell Crucible 159 
 
 Calibrating Burette 88 
 
 Calipers 291 
 
 " Micrometer 290, 291 
 
 " Vernier 291 
 
 Caliper Rule 290 
 
 Calomel Normal Electrodes. .. . 396 
 Calorimeters and Accessories 
 
 101 to 109 
 Calorimeter Pan, Platinum .... 422 
 ■' Thermometers, 101, 
 
 102, 103, 105, 107,,. lOS 
 " Thermometers , 
 Platinum Resist- 
 ance 10.5 
 
 Camel's Hair Brushes S;) 
 
 Caloriscope for Plant Physi- 
 ology 416 
 
 Camera, for Color Comparison 
 
 Tubes ._ 144 
 
 " Photographic, for Spec- 
 troscopy 494 
 
 " Stereoscopic, Driiner. 326 
 
 Lucida, Abbe, B. & L 316 
 
 " Zeiss... 324 
 
 Camp Color Comparison Tubes 143 
 
 " Shaking Apparatus 484 
 
 Canulae 402 
 
 Capillary Electrometers 395 
 
 Pipette 413 
 
 Tubing 260 
 
 Caps, for Burettes S8 
 
 Rubber, for Test Tubes.. 476 
 
 Capsules, Blood, Wright 267 
 
 " Combustion 149 
 
 " Expansion, for Ther- 
 mo Regulators 537 
 
 Carbon Apparatus, Parr 110 
 
 Carbon Dioxide Cylinders 252 
 
 " " Freezing At- 
 tachment for 
 Microtomes, . , 346 
 " Tubes for Color Com- 
 parison 143 
 
 Carbonic Acid Cuntcnt of Blood 
 Apparatus, Barcroft 
 
 and Haldane 405 
 
 Carbonic Acid Determination 
 
 Apparatus 99 
 
 Acid Flask 2IS 
 
 Carbons for Arc Lamps 448 
 
 Carboy Inclinator 110 
 
 Stopper 110 
 
 Cardiographic Apparatus. 405 to 411 
 Cardioid Condenser Ultra-Mi- 
 croscope, Zeiss 329 
 
 Carius Explosion Furnace 236 
 
 Carliczek Wire Gauze 554 
 
 Carnotite, Standardized 460 
 
 Carr Vacuum Oven 379 
 
 Cartilage Knife 181 
 
 Shears 184 
 
 Case Patent Crusher 162 
 
 f 'a.ses for Dissecting I n s t r u- 
 
 ments 184 
 
 ■' " Gas Collecting Tubes 251 
 
 " " Polariscopes 427, 432 
 
 Casseroles, Porcelain 110 
 
 Silica 110 
 
 Cassia Flask 224 
 
 Cathetometers 296 
 
 Cathodes, Platinum 420 
 
 Cedar Oil Bottles 77 
 
 Cells for Calomel Normal Elec- 
 trodes 396 
 
 " Conductivity 390, 391 
 
 " for Gas Electrodes 396 
 
 " Half Elements 396 
 
 " Micro Slides 335 
 
 " Porous 172 
 
 " Selenium 481, 482 
 
 " Spectrum 504 
 
 " Weston Standard 396 
 
 Cellular Incubator, Hearson... . 33 
 
 Celluloid Rule 290 
 
 Cellulose Rings for Anaerobic 
 
 Culture Apparatus ... S 
 
 Cement, Asbestos 14 
 
 " Refractory, Alundum . 7 
 " " Vulcan 
 
 Paste no 
 
 Sieves 487 
 
 " Testing Apparatus 
 
 111 to 114 
 Cementation and Ductility Ma- 
 chine, Kirchbraun 1.") 
 Centrifuges and Accessories 
 
 115 to 123 
 
 Centrifuge Tube Support 524 
 
 Certified Burettes 80 
 
 Pipettes 414 
 
 Chaddock Burner 92 
 
 " Burette Support 90 
 
 " Clamps 142 
 
 Chamberland Culture Flasks.. . 172 
 Chamberland-Pasteiir Pressure 
 
 Filter... 211 
 
 C'hambers, Moist 170 
 
 Chamot Chemical Microscope . . 313 
 
 Chapman Filter Pumps 217 
 
 Charcoal, for Blowpiping 74 
 
 Chardin Filter Paper 216 
 
 Charging Rod for Electroscopes 462 
 
 Charts." 124 to 139 
 
 Chemical Microscope, Bausch & 
 
 Lomb 313 
 
 Chemical Technology Charts 129,130 
 
 Chew Ductility ^lachine 16 
 
 Chipmunk Crushers 164 
 
 Chloride Calcium Cjdinders. ... 99 
 
 Tubes 99, 100 
 
 Chopper, Meat 297 
 
 Chromophotometer, Plesch. . . . 147 
 
 Chromo-Saccharometer .543 
 
 Chronograph, Thury 139 
 
 Chronometers, Graphic, Jaquet 400 
 
 Chromoscope, Arons 146 
 
 (Jhronoscopes 139 
 
 Chun Binocular Microscope. . . , 330 
 Circulation, Apparatus for the 
 Graphic Study of 
 
 405 to 411 
 
 Claisen Distillation Flask 222 
 
 Clainps _. 140 to 143 
 
 " for Microtomes 346 
 
 " " " Zabris- 
 
 kie 344 
 
 " " Microtome Knives.. 347 
 
 Clamp Holders 140 
 
 Classen Platinum Dish for 
 Electrolj'tic Separa- 
 tion 422 
 
 " Switch Board and Work 
 Table for Quantita- 
 tive Electrolysis 196 
 
 Clay Combustion Boats 149 
 
 " Tubes 149 
 
 Cleaning Apparatus for Test 
 
 Tubes 522 
 
 Cleveland Fire Tester 368 
 
 Clinical and Physiological Ap- 
 paratus 398 to 411 
 
 " Thermometers for Vet- 
 erinary Use 535 
 
 Clinostat 416 
 
 Clock, Center Seconds 511 
 
 " Thayer Interval Timer. . 143 
 
 Closets, Glass, for Drying 194 
 
 Cloth, Emery 205 
 
 " Counting Glasses 288 
 
 " Testing Balances 529 
 
 " and Leather Tester, 
 
 Schopper 525 
 
 Coagulometers 266 
 
 Coagulators for Blood Serum .32, 34 
 
 Coddington Magnifiers 287 
 
 Coils, Induction 275 
 
 Cold Closets 45 
 
 Collecting Case, Botanical 75 
 
 Tubes for Blood 267 
 
 " Gas 251 
 
 Collections, Minerological 361 
 
 " Petrological 361 
 
 Collodion Balloons 65 
 
 Colony Counting Apparatus. . . 155 
 
 Colorimeters 145 to 148 
 
 Color Comparison Tubes 143 
 
 " " Tube Cam- 
 era 144 
 
 " Tester, Zeiss 147 
 
 " Testing Apparatus 143 to 148 
 " and Turbidity Determin- 
 ing Apparatus 542 
 
 Combined Drawing, Alicro-Pho- 
 tographic and Pro- 
 jection Apparatus, . , 339 
 Combination Magnifiers, Zeiss.. 288 
 
 Combustion Boats 149 
 
 " Platinum ... 421 
 
 " Capsules 149 
 
 Furnace, Fletcher. 235 
 
 Glaser. .. 236 
 
 " " Heracus.. 238 
 
Page 
 
 Combustion Furnace, Heraeiis- 
 D e n n - 
 stedt . . - . -239 
 " " Hoskins.. 237 
 
 " " von Babo 
 
 Erlen- 
 meyer... . 1^36 
 
 " Train, Vanier 150 
 
 Tubes 149 
 
 " Platinum.. . 421 
 " (Test Tubes) 520 
 
 Tube Burner 94 
 
 Tubing, Glass 260 
 
 Commutator, Mercury 395 
 
 Pohl 402 
 
 Comparators 292, 293 
 
 Comparison Spectroscope, Zeiss 501 
 
 " Tubes, Color 143 
 
 Compartment Incubators 29, 30, 33 
 Compensation Apparatus (Po- 
 tentiometer) Fis- 
 cher, for Cath- 
 ode Potentials. . 199 
 
 Compound Blast Burner 95 
 
 Compression Pumps for Gases. 151 
 
 Compressors, Air 1 to 6 
 
 Compressor for Liquid Air. . . . 2S5 
 Compressors, Screw, for Rubber 
 
 Tubing 142 
 
 Concave Slides 334, 335 
 
 Concentric Rings 475 
 
 Condensers 152 
 
 Condenser, Bul!s-Eye 317 
 
 Kjeldahl 364 
 
 " Substage, B. &L,.. 315 
 
 " " Zeiss .... 320 
 
 Tar Testing 18 
 
 Condenser Flask for Micro 
 
 Lamps 332 
 
 " Supports 153 
 
 " Trough, for Tar 
 
 Testing IS 
 
 Tube for Urea, Folin 543 
 
 Tubos 152 
 
 Conditioning Ovens 52S, 529 
 
 Conductivity of Electrolytes, 
 Apparatus and 
 Accessories. 390 to 394 
 
 Cells 390, 391 
 
 Vessel Clamp .... 143 
 " " Support . . . 515 
 
 Cones, Filtering, Alundum 213 
 
 S. & S. Paper. 215 
 
 " " Platinum 421 
 
 " Measuring 291 
 
 " Pyrometric 458 
 
 Configuration Atom Models.-, 19 
 
 Conical Glasses 520 
 
 Connecting Bulbs, Kjeldahl. ... 366 
 Tube for Gas Bu- 
 rettes 251 
 
 Tubes for Marshall 
 Urea in Blood Ap- 
 paratus 266 
 
 Connectors, for Batteries 68 
 
 " " Stopcocks 510 
 
 Consistency Meter 261 
 
 Constant Deviation Spectrom- 
 eter 495 
 
 Constant Temperature Bath, 
 
 Freas 393 
 
 Constant Temperature Bath, 
 
 Oswald 392 
 
 Constant Temperature Bath, 
 
 for Microscopes 333 
 
 Page 
 
 Contact Keys 395 
 
 " " DuBois-Reymond 402 
 
 Control Tube for Polariscopes 435 
 
 Convertible Balopticon 444 
 
 Coplin Object Clamp for Micro- 
 tomes 346 
 
 " Paraffine Embedding 
 
 Bath 43 
 
 " Staining Jar 507 
 
 Copper Analysis, Herman Elec- 
 trolytic Outfit for 197 
 
 " Beakers 6S 
 
 " Crucibles 159 
 
 " Determination Flask. . , 218 
 
 " Flasks 220 
 
 " " for Moisture 
 
 Test 222 
 
 " Funnels 229 
 
 Oxide Flasks 220 
 
 " Tank for Distilled 
 
 Water 512 
 
 " Wire .... 554 
 
 Cord, Asbestos 14 
 
 Corks 154 
 
 Rubber 477, 478 
 
 Cork Borers 154 
 
 " Borer Sharpener 154, 155 
 
 " Extractor 155 
 
 " Knife 282 
 
 " Press .... 155 
 
 " Screws 155 
 
 " Tongs 155 
 
 Cornet Cover Glass Forceps — 228 
 
 Coronary Artery Scissors 184 
 
 Cornu Prisms 504 
 
 Cottle Extraction Apparatus. . , 207 
 
 Counter Balances 59 
 
 Counters, Thread 288 
 
 Counterpoised Watch Glasses. . .547 
 
 Countershafts for Motors 363 
 
 Counting Apparatus for Bac- 
 teria... 155 
 " Blood. 262 
 
 " Chambers 262 
 
 " Pipette for Bacteria 
 
 in Milk 413 
 
 Couplings for Filter Pumps .... 217 
 
 Cover for Balances 64 
 
 " Earthenware, for Petri 
 
 Dishes 170 
 
 " and Receiver for Sieves. 486 
 " Glasses for Haemacy- 
 
 tometers 263 
 
 " Glasses Micro 334 
 
 " " for Polariscopes . 435 
 
 " Glass Forceps 227, 228 
 
 " " Gauge 292 
 
 Creamometers 348 
 
 Cream Test Balance 351 
 
 " " Bottles,,. 350 
 
 Creosote Sulphonation Test 
 
 Funnel 231 
 
 Croweil Positive Pressure Blow- 
 er 73 
 
 " Rotary Air Pumps 5, 6 
 
 Crucibles, Assav 156, 157 
 
 Platinum 421 
 
 Porcelain 158, 159 
 
 " " for Asphalt 15 
 
 " Transparent Quartz. 459 
 
 Crucible Furnace Fletcher 234 
 
 " Hoskins 239 
 
 Holders 160, 161 
 
 Tongs 5.38, 539 
 
 " Tubing, Rubber 480 
 
 Crushing, Grinding and Pulver- 
 izing Apparatus 161 to 169 
 
 Cryoscopes 169 
 
 Crystal Axes Models 358 
 
 Models 359, 360 
 
 " Modeling Apparatus, 
 
 Goldschmidt 352 
 
 Crystallizing Dishes 177 
 
 Crystallographic, Mincralogical 
 and P e t r o - 
 graphical Ap- 
 paratus 352 to 361 
 " Microscope, 
 
 Zeiss 330 
 
 Crystallography, Charts of 133 
 
 Cube Moulds, for Cement Ill 
 
 Cubic Foot Gas Bottles 255 
 
 Culture Apparatus, Anaerobic 8 
 
 " Dishes 170 
 
 " Dish Holders 171 
 
 Flasks 171, 172 
 
 " Slides 334,335 
 
 Tubes 172. 520, 521 
 
 " Tube Baskets .522 
 
 Cupels 172 
 
 Cupel Mould 172 
 
 " Rake 172 
 
 " Shovel 172 
 
 " Tongs 539 
 
 Cups, Annealing 13 
 
 " Drop 173 
 
 " or Cells, Porous 172 
 
 " Swimming 515 
 
 Curie Electroscope and Acces- 
 sories 461, 462 
 
 Curve Analyzer, Jaquet 408 
 
 Cutter, Bagasse 297 
 
 " Glass 258 
 
 " " Tubing 258 
 
 Cyclone Centrifuges 120 
 
 Cjdinders, Calcium Chloride ... 99 
 
 " Filtering 210 
 
 Gas, for CO., Oxy- 
 gen, etc 2.52 
 
 " Glass 173 
 
 " Graduated Precision 174 
 " for Hydraulic Press- 
 es 437 
 
 " Immunity Unit 174 
 
 Mixing 173 
 
 " " Precision. . . . 174 
 
 for AToisture Tester. 173 
 " " Testing Sewage.. 173 
 
 Cvlindrical Shelf for Pneumatic 
 
 Troughs 423 
 
 Cytologv and Haematology, 
 
 Charts of 131 
 
 D 
 
 Dairy Thermometer 535 
 
 Daland Haematokrit 115 
 
 Dalen-Martens Rubber Tester. 527 
 
 Dam, Rubber 478 
 
 Dangler Gasoline Burner 97 
 
 Dare Haemaglobinometer 265 
 
 Dark Field Condensers, B. & L 315 
 " " Zeiss.. 320 
 
 Decimal Balances 54 
 
 Decimeter Rule 290 
 
 Decomposition of Water Appa- 
 ratus 263, 284 
 
 Deflagration Spoons 174 
 
 Dehydrator, Ilearson. for Con- 
 tinuous Drying of Tissues in 
 Alcohol 44 
 
Delepine CentrifugL' 123 
 
 Demijohns 175 
 
 Demonstration Ammeters, Gal- 
 vanometers and 
 
 Voltmeters 200 
 
 " Microscope, B. 
 
 & L 311 
 
 Demonstrating Ocular, Double. 333 
 Dennis-Orsat Gas Analysis Ap- 
 paratus 245 
 
 Dennison Labels 282, 283 
 
 Dennstedt Furnace for Elemen- 
 tary Organic Analysis 230 
 
 Densitometers 387 
 
 Dental Dam 478 
 
 Denver Fire Clay Crucibles., , . 156 
 
 Deprez Signal Marker 401 
 
 Dermatoscope, Zeiss 325 
 
 Desiccators 175, 17G 
 
 Desiccator Plates 175 
 
 Despatch Electric Drying Ovens 378 
 
 Detroit Burner 92 
 
 Dewar Vacuum Flasks 224 
 
 Dialyzers 176 
 
 Dialyzer Tubing 176 
 
 " Filter Paper, Moro- 
 
 chowetz 216 
 
 Dialyzing Method, Abderhal- 
 
 den, Apparatus for. , 177 
 
 Dialyzing Paper 382 
 
 Thimbles 176 
 
 " " Abder- 
 
 halden. . . , 177 
 
 Diamond, Writing 176 
 
 Diamond Glass Cutter 258 
 
 Ink 275 
 
 " Mortars 362 
 
 Diazo Reaction Glass, Ehrlich. 543 
 
 Dichroscopes 354 
 
 Dielectric Constant Apparatus 
 
 and Accessories 390 to 394 
 
 Differential Manometer, Konig. 290 
 " Pressure of Blood 
 Gases Apparatus, 
 Barcroft and Rob- 
 erts 405 
 
 Diffusion Shells 176 
 
 " Ab(lcrhai<lcn.,, 177 
 
 Digesters 20 
 
 Digesting Shelf, KjoldalU 304 
 
 Dionic Water Tester 553 
 
 Dipping Refractometer 467 
 
 Direct Vision Spectroscopes. . . . 492 
 
 Discs, Filter, of Alundum 212 
 
 " Rubber, for Foot Blow- 
 ers 73 
 
 " Ultrafilter, Bechhold. ... 212 
 
 Dishes 177 to ISO 
 
 " Aluminum 180 
 
 " Alundum, for Incinera- 
 
 ations 178 
 
 " Boas, for Feces Exj)eri- 
 
 ments 177 
 
 " Crystallizing 177 
 
 Culture 170 
 
 " Enamel Ware 1^0 
 
 " Evaporating, Glass.. . 17'.i 
 " " Nickel, for 
 Tar Test- 
 ing IS 
 
 " " Porcelain. . 178 
 
 Silica 179 
 
 " Filtering, Alundum 213 
 
 " Incinerating Alundum . , 178 
 " Iron " 180 
 
 Di.-^hes, Lead 180 
 
 Nickel 180 
 
 " Platinum 421, 422 
 
 " Preparation 180 
 
 " Roasting, Battersea .... 475 
 
 " Silver 180 
 
 Sputum 506, 507 
 
 " Staining 507 
 
 Tin Foil 180 
 
 " Transparent Quartz , , . . 459 
 
 Weighing 180 
 
 Dish Clamps 142 
 
 Dispensing Balance 59 
 
 Burette 88 
 
 Dissecting Instruments. . , 181 to 185 
 " Microscopes, B. & L. 311 
 
 " " Meyer. 327 
 
 " " Mag- 
 
 nifiers, 287 
 
 Pan 538 
 
 Distillation Fla.sks 222 
 
 Distilled Water Storage Tanks 511 
 
 Distilling Apparatus 186 to 192 
 
 Kjeldahl.. 364 
 " " for Mer- 
 
 cury, Hu- 
 
 lett 297 
 
 " " for Miner- 
 
 al Oils.... 373 
 " " Vacuum 
 
 190 to 192 
 
 Tubes 191 
 
 Tube, Hempe! 19 
 
 Distributors for Gas 254 
 
 Dixon's Plumbago Crucibles . . . 157 
 Dodge Photographic Register . . 409 
 
 Dolezalek Electrometer 463 
 
 Donitz-Hartmann Charts of 
 Parasitic Protozoa and their 
 
 Carriers 131 
 
 Doolittle Torsion Viscosimeter 371 
 
 Doremus L'reometers 544 
 
 Doremus-Hinds Ureometers . . . 544 
 Dorn-Goetze Spectrum Tubes . . 505 
 Double Demonstrating Ocular . 333 
 
 " Hooks 181 
 
 Walled Funnels 229 
 
 Doublet Magnifiers 287 
 
 Draft Gauge, Seger 290 
 
 Drawing Apparatus for the Mi- 
 croscope, B. & L 317 
 
 Board, B.&L 316 
 
 Table, Bernhard 324 
 
 " Micro-Photographic 
 and Projection Ap- 
 paratus, Combined, 
 
 Bausch & Lomb -339 
 
 Drechsel Gas Washing Bottles. 250 
 
 Dressing Jars 280 
 
 Dreverhoff Filter Paper 216 
 
 Drops, Prince Rupert 480 
 
 Drop Culture Slides 334, 335 
 
 " Cups 173 
 
 Dropping Bottles 76, 77 
 
 " Funnel 231 
 
 " Pipettes 412 
 
 Drucker Cadmium Normal Ele- 
 ment 396 
 
 " Calomel Normal Elec- 
 trodes 396 
 
 Viscosity Tubes 397 
 
 Drucker-BurrianCryoscope. . . . 169 
 
 Drug Mills 165 
 
 Driiner Stereoscopic Camera, . . 326 
 Drv Batteries 66 
 
 Di-ying Apparatus for Serum, 
 
 etc 193 
 
 Closets, Glass 194 
 
 Ovens 374 to 381 
 
 " Oven for Asphalt Test- 
 ing _ 15 
 
 " Paper, Botanical 75 
 
 7\ibes 193 
 
 " " Calcium Chlo- 
 ride 99, 100 
 
 Drying Tube and Potash Bulb 
 
 Combined, Vanier 193 
 
 DuBois-Reymond Contact 
 
 Key 395,402 
 
 " " Inductorium. 402 
 
 Duboscg Colorimeters 145 
 
 Ductility Machine, Chew 16 
 
 " " Kirchbraun 15 
 
 " " Smith 16 
 
 Dudley Sulphur Apparatus 512 
 
 " Viscosity Pipette 370 
 
 Dujardin-Saleron Ebulliometer. 194 
 
 Dulin Rotarex 17 
 
 Dunning Colorimeter 144 
 
 Duplex Slide Rule 489 
 
 Dupont Nitrometer 367 
 
 Dye Baths 551 
 
 " Pots 68 
 
 Earthenware Covers for Petri 
 
 Dishes 170 
 
 Tiles 538 
 
 Ebulliometer, Dujardin-Salleron 
 
 194 
 Edelmann Electro-Cardiograph 
 Outfit and Accesso- 
 ries 409 
 
 " Einthoven String 
 
 Galvanometer 409 
 
 Edison Primary Batteries 65 
 
 Eggertz Color Comparison 
 
 Tubes 143 
 
 Ehrlich Cover Glass Forceps ... 227 
 
 " Adjustable Ocular 265 
 
 " Ocular Diaphragm for 
 
 Blood Counting 264 
 
 " Diazo Reaction Glass . . 543 
 
 " Pipettes 415 
 
 Eiloart Atom Models 19 
 
 Einhorn Fermentation Saccha- 
 
 roraeter 544 
 
 Einthoven String Galvanometer 
 
 Edelmann 409 
 
 " String Galvanometer 
 
 Cam-Scientific Inst. 
 
 Co 410 
 
 Electric Arc Furnaces 241 
 
 " " Lamps for Micro- 
 scopes 331 
 
 Dessiccator 176 
 
 Drying Ovens 376 
 
 Flask Heaters 227 
 
 Furnaces, Hos- 
 
 kins 237, 239, 240 
 
 " Northrup ... 243 
 Fiirnace Temperature 
 
 Regulator, Thwing 237 
 
 Heater for Milk Testers 350 
 
 Hot Plates 268 to 271 
 
 Illuminating Device for 
 
 Polariscopes 
 
 Motors 
 
 432 
 
 363 
 
 Thermo-Regulators . . . 537 
 
Electric Vacu 
 
 Furnace, Ar- 
 
 sem 242 
 
 Water Baths 560, 551 
 
 Electro-Cardiographic Outfit, 
 
 Cambridge Scientific Inst. Co. 410 
 Electro-Cardiograph Outfit and 
 
 Accessories, Edelmann 409 
 
 Electro-Chemistry Apparatus, 
 including Rheostats, Volt- 
 meters and Ammeters, . . 195 to 204 
 (For Storage Batteries see p. 66.) 
 Electrodes, Calomel Normal... . 396 
 
 " Immersion 391 
 
 Metal for Half Ele- 
 ments 396 
 
 " Net, of Nickel^ 
 
 Fischer 199 
 
 Platinum 396, 420 
 
 " Unpolarizable 402 
 
 Electrode Cells, Ostwald 396 
 
 Electrol^'sis in Magnetic Field, 
 
 Apparatus for 200 
 
 Electrolytic Analysis Switch 
 
 Boards 195 to 19S 
 
 " Gas Generator for 
 Oxygen and Hy- 
 drogen 254 
 
 " Stirring Appara- 
 tus, Fischer 199 
 
 Supports 198, 199 
 
 Electrometer, Capillary 395 
 
 Dolzalek 463 
 
 " Schmidt 462 
 
 Electrometer Key 395 
 
 Electro-motive Force by the 
 Potentiometer Method, Appa- 
 ratus for 395 
 
 Electroscopes for Radio-Chem- 
 istry 460 to 464 
 
 Elements, Cadmium Normal. . , 396 
 " Chart of, Mendele- 
 
 jeff. ..... 130 
 
 " " " with their 
 
 Atomic 
 Weights.. 130 
 " Half, for Physical 
 
 Chemistry 396 
 
 " Heraeus for Pyrom- 
 eters 451 
 
 Elliott Fire Tester 36S 
 
 Emanation Electrometer, 
 
 Schmidt 462 
 
 " Electroscope, Ru- 
 therford 464 
 
 Embedding Apparatus for Va- 
 cuum 43 
 
 Box 348 
 
 Ovens, Paraffine. .42, 43 
 
 Table 348 
 
 Embryological Incubator, Hear- 
 
 son. Electric 29 
 
 Watch Glasses.. 547 
 Emerson Conditioning Oven.. . . 529 
 
 " Fuel Calorimeter 103 
 
 " Razor Strop 348 
 
 Emery Cloth 205 
 
 " Paper 205 
 
 Enamel Ware Beakers 68 
 
 ' Dishes 180 
 
 ' Funnel 229 
 
 ' Graduate 262 
 
 ' Trays 538 
 
 ' Waste Pail 546 
 
 Engelmann Microspectral Ob- 
 jective • ■ ■ 324 
 
 Pago 
 
 Engler Apparatus for Distilla- 
 tion of Mineral Oils 373 
 
 Distillation Flasks 222 
 
 " Viscosimcters 371, 372 
 
 " Viscosimeter Flasks. . . . 373 
 
 Engravers Glasses 287 
 
 Enlarging Outfit for Lantern 
 
 Slides 439 
 
 Erdmann Burette Float 88 
 
 Erdmenger-Mann Volumenom- 
 eter 114 
 
 Erlenmeyer Flasks 221 
 
 Errera and Laurent Plant Physi- 
 ology Charts 129 
 
 Esbach Albuminometers 543 
 
 Esbach-Schelenz Albuminom- 
 
 eter 543 
 
 Esmarch Water Sampling Ap- 
 paratus 553 
 
 Ether Bottles S4 
 
 " Distillation Flask Heater 227 
 
 " Hydrometer 273 
 
 Eudiometers 205 
 
 Eureka Burner 94 
 
 Evaporating Burner 96 
 
 " Dishes, Glass, . .. 179 
 " " Nickel, for 
 Tar Test- 
 ing 18 
 
 " " Porcelain . 178 
 
 Silica 179 
 
 Ewald Chronoscope 139 
 
 Excelsior Mill 165 
 
 Expansion Capsules for Ther- 
 mo Regulators 537 
 
 " Pyrometers 450 
 
 Explosion Furnace, Carius 236 
 
 Extension Clamps 140 
 
 Extraction Apparatus 206 to 208 
 
 " " Barrett- 
 
 Cottle... IS 
 '* " Supports 
 
 with 
 Heaters 
 
 207, 208 
 
 Flasks 205 
 
 Thimbles 205 
 
 Tubes 205 
 
 Tube, Fat, Rohrig. . 351 
 Extractor for Bituminous Mix- 
 tures - . . • 16 
 
 Extractor for Bituminous Mix- 
 tures — Dulin Rotarex 17 
 
 F 
 
 Factor Weight for use with Van- 
 
 ier Combustion Train 150 
 
 Fairbanks Testing Machines for 
 
 Cement 112 
 
 Faraday's Law Demonstration 
 
 Apparatus 195 
 
 Faraday Washing Bottle 546 
 
 Fat Extraction Tube, Rohrig. . . 351 
 Faust-Heim Drying Apparatus. 194 
 
 Femel Patent Stills 189 
 
 Fermentation Saccharometer. . , 544 
 
 Tubes 209 
 
 " Tube Supports 
 
 209, 524 
 Fernbach Antitoxin Flask. . , . 171 
 
 F6ry Refractometer 473 
 
 " Thermo-electric Calorim- 
 eter 106 
 
 Feser Lactoscope , . 349 
 
 Fibre Blocks 
 
 Field Glasses, Bausch & Lomb- 
 
 Zeiss Stereo 
 
 P'igures of Steel for Stamping. 
 
 Filar Micrometer, B. & L 
 
 Files 
 
 File Handles 
 
 Filling Attachment for Test 
 
 Tubes 
 
 Filters, Berkefeld 
 
 " Light, Wratten& M'ain- 
 wright, for Micro-Pho- 
 tography 
 
 " Maassen 
 
 " Pasteur-Chamberland. . 
 
 Pukal 
 
 " Ray, for Spectroscopy 
 
 Filter Apparatus 209 to 
 
 " Bags 
 
 " Cones, Alundum 
 
 " " Paper, S. & S. . . . 
 
 " " Platinum 
 
 " Crucibles 
 
 " Discs, Alundum 
 
 " Dish, Alundum 
 
 " Flasks 
 
 " Paper 213 to 
 
 " " for Agar 
 
 " " Blocks for Absorp- 
 tion 1 
 
 " Box 216 
 
 " Presses 217 
 
 " Pumps 217 
 
 " " for both Suction 
 
 and Pressure 218 
 
 " Racks 216 
 
 " Tubes 218 
 
 " Tube for Gases 254 
 
 Finder, Maltwood 324 
 
 Finger Cots, Rubber 476 
 
 Fiolax Glass Test Tubes 520 
 
 " Tubing 260 
 
 Fire Testers 368 
 
 Fischer Double Net Electrode 199 
 " Electrolytic Supports. . 198 
 
 Glass Stirrer 199 
 
 " Micro Polariscope 429 
 
 Tube 434 
 
 " Potentiometer 199 
 
 Speed Counter 199 
 
 " Stiring Apparatus 509 
 
 Fischer-Fresenius Electrolytic 
 
 Support 198 
 
 Fittings for Wash Bottles 
 
 Flash Point Testers 368 to 
 
 Flasks 218 to 
 
 " Abderhalden 
 
 " Acetylization 
 
 Boiling 219, 
 
 Carbonic Acid 
 
 Cassia 
 
 Copper 
 
 for Copper Determina- 
 tions 
 
 for Copper Oxide Deter- 
 minations 
 
 Culture 171, 
 
 Distillation 
 
 Ergler, for Viscosi- 
 
 meters 
 
 Erlenmeyer 
 
 Extraction 
 
 Filtering 
 
 546 
 370 
 
 226 
 177 
 218 
 218 
 220 
 218 
 224 
 220 
 
 373 
 221 
 205 
 223 
 
Page 
 Flasks for Iodine Determina- 
 tions 220 
 
 " Joliet 218 
 
 " Kjeldahl 223, 224 
 
 Moisture Test 222 
 
 " Silica 219 
 
 " for Soil Analysis 218 
 
 Sugar 226 
 
 " for Sulphur Determi- 
 nations 218 
 
 " Transparent Quartz 459 
 
 " Vacuum, Dewar 224 
 
 Volumetric 224 to 226 
 
 " " Precision. . . 225 
 
 " for Wash Bottles 219 
 
 Flask Condenser for Micro 
 
 Lamps 332 
 
 " Heaters 227, 541 
 
 " Heater with Hot Plate. . 270 
 " Holders for Ostwald Ther- 
 mostats 392 
 
 Fleisch Electrodes 402 
 
 FleisthI llacinomoter 265 
 
 Fleisthl-Miescher Haemometer 266 
 
 Fletcher ( '..iulm^tion Furnace.. 235 
 
 Ci'iiiibie Furnaces. . . . 234 
 
 " MutBe Furnaces 235 
 
 " Radial Burner 97 
 
 " Safety Burner 93 
 
 Solid Flame Burner. . . 98 
 
 " Water Heater 552 
 
 Flexible Copper Tubing for 
 
 Burner Connections 98 
 
 Flicker Photometer Sight-box. . 384 
 
 Floats for Burettes 88 
 
 Flow Plate and Mould, Asphalt 15 
 
 Focusing Glass 342 
 
 Foil, Platinum 420 
 
 Folded Filters, S. & S 215 
 
 Folding Rules 290 
 
 " Test Machine for 
 
 Paper 526 
 
 Folin Apparatus for Nitrogen, 
 Urea and Ammonia in 
 
 Urine 543 
 
 " Modification of Kjeldahl 
 
 Apparatus 365 
 
 " Tube for Marshall Urea 
 
 in Blood Apparatus 266 
 
 Foot Blowers 73 
 
 Force Autoclave Ill 
 
 Forceps 227 
 
 " Artery 181 
 
 " Blowpiping 227 
 
 " Bone Cutting 181 
 
 Cover Glass 227 
 
 " Dissecting 181 
 
 " Pinning 227 
 
 " Platinum Tipped 227 
 
 Slide 228 
 
 Foster Fire Tester 368 
 
 Fraas Paleontological Charts... 133 
 Fractional Distillation Tubes. . 191 
 
 " Weights 64 
 
 Frank Rubber Viscosimeter .... 480 
 Frank and Tschirch Plant Phyai- 
 
 oloffy Charts 128 
 
 Fraunhofer Micrometer Micro- 
 scope 292 
 
 Freas Constant Temperature 
 
 Bath 393 
 
 " Electric Drying Ovens, . . 377 
 
 " " Incubators 27 
 
 " " Shaking Appara- 
 tus 485 
 
 Page 
 
 Freas Electric Sterilizers 40 
 
 " " Tube Furnace... 236 
 " " Vacuum Oven. , . 379 
 Freezing Attachment for Mi- 
 crotomes 346 
 
 " Microtome, Bardeen., 346 
 " " Sartorius.. 345 
 " Tubes for Molecular 
 Weight Determina- 
 tion Apparatus 389 
 
 Fresenius Arsenic Apparatus . .. 14 
 
 " Desiccator 175 
 
 Nitrogen Bulb 360 
 
 Freudenreich Culture Flasks. . . 171 
 Friedberger-Kanten Metal 
 
 Culture Dishes 170 
 
 Friedenthal Cryoscope 169 
 
 Friedrlchs Condensers 153 
 
 " Double Automatic 
 
 Pipette 412 
 
 " Gas Washing Bottle. 250 
 
 "Frigo" Cold Closets 45 
 
 Fruehling and Scfiultz Desic- 
 cators 175 
 
 Fuchs-Rosenthal Counting Ap- 
 paratus 263 
 
 Fuess Monochromator 500 
 
 " Spectrograph 497 
 
 Fume Absorption Tube, Folin 543 
 
 Funnels 228 to 230 
 
 " for Burettes 88 
 
 " Copper 229 
 
 Double Walled 229 
 
 " Enamel Ware 229 
 
 Hot Air 230 
 
 " Water 230 
 
 Porcelain 229 
 
 Rubber 229 
 
 " Sedgewick-Rafter 552 
 
 " Separatory 230 
 
 " " for Creo- 
 
 sote- ... 19 
 " Water 
 
 in Tar.. 18 
 Funnel Attachment for Filling 
 
 Test Tubes 231 
 
 " Flasks for Filtering. . . . 223 
 " Plates of Porcelain .... 419 
 
 " Supports 232 
 
 " Tubes 232 
 
 Furnaces 234 to 244 
 
 " Ass ayers Combination, 
 
 Brown 235 
 
 " Combustion, Fletcher 235 
 
 Glaser.. 236 
 
 " Hoskins 237 
 
 " " von Ba- 
 
 bo-Erlen- 
 
 meyer . . 236 
 
 Crucible, Fletcher., . . 234 
 
 Hoskins 230 
 
 " Electric Arc 241 
 
 " " Vacuum, Ar- 
 
 sem 242 
 
 " for Elementary Or- 
 
 ganic Analysis, Her- 
 
 acus-Dennstedt 239 
 
 " Explosion, Carius .... 236 
 
 " High Temperature, 
 
 Northrup 243 
 
 Muffle, Fletcher 235 
 
 " " Hoskins 240 
 
 " " Wiesnegg 235 
 
 " Tube, Freas. , 236 
 
 Page 
 Fused Rock Crystal Apparatus 459 
 
 Fusel Oil Apparatus 245 
 
 Fuses for Projection Apparatus 448 
 
 G 
 
 Gabritschewsky Culture Dishes 170 
 
 Gaede Air Pumps 1 to 5 
 
 Galaetoraeter, Adam 351 
 
 Galvanometers for Junker Au- 
 to m a t i e Gas 
 Calorimeter. . . . 109 
 " Demonstration. 200 
 
 " Binthoven 
 
 String, Edel- 
 
 mann 409 
 
 " Einthoven 
 
 String, Cam- 
 b ri dge Scien- 
 tific Inst. Co.. 410 
 
 Galvanoscopes 201 
 
 Gang Moulds Ill 
 
 Ganong Plant Physiology Ap- 
 paratus 416 to 418 
 
 Gas Analysis Apparatus . .245 to 257 
 Gas Analysis Apparatus, Allen 
 
 and Moyer 245 
 
 Gas Analysis Apparatus, Burrell 247 
 Gas Analysis Apparatus, Hal- 
 
 dane 248 
 
 Gas Analysis Apparatus, Loms- 
 
 chakow 246 
 
 Gas Analysis Apparatus, Orsat- 
 
 Dennis 245 
 
 Gas Analysis Apparatus, Orsat- 
 
 Fischer 245 
 
 Gas Analysis Apparatus, Orsat- 
 
 Lunge 245 
 
 Gas Analysis Apparatus, Orsat- 
 
 Muencke 245 
 
 Gas Analysis Apparatus, Peter- 
 
 sen-Palmquist 249 
 
 Gas Analysis Apparatus for Sul- 
 phur and Ammonia 249 
 
 Gas Analysis Apparatus, Tut- 
 
 wiler 249 
 
 Gas Analysis Apparatus, Wil- 
 liams 246 
 
 Gas Bags 250 
 
 " Balance 250 
 
 " Bnlloons 250 
 
 " Buttles, Cubic Foot 255 
 
 '■ Rurcltes 251 
 
 " Calorimeter, Junkers 108 
 
 " " Parr 107 
 
 " " Sargent 107 
 
 " Collecting Tubes 251 
 
 " Compression Pumps. ,.,.,. 151 
 " Cylinders for COa, Oxygen, 
 
 etc 252 
 
 " Cylinder Support 252 
 
 Valves 252 
 
 " Distributors 254 
 
 " Filter 254 
 
 " Tube 254 
 
 " Generating Bottles 250 
 
 " Generators 253 
 
 " Holders 253 
 
 " Hose, Rubber 479 
 
 " Interferometer 471 to 473 
 
 " Lamp, Harcourt Pentane . . 256 
 
 " Measuring Tubes 253 
 
 " Meter for Jmiker Gas Ca- 
 lorimeter 108 
 
 " Meters 255, 256 
 
Page 
 Gas Meter, Experimental, Bohr 404 
 
 " Micro Lamps 331 
 
 " Pipettes 256, 257 
 
 " Pressure Regulator for Jun- 
 ker Gas Calorimeter 108 
 
 " Pressure Regulator for 
 
 Pressure Cylinders 252 
 
 " Pressure Regulator for 
 
 Thermo-regulators 537 
 
 " Regulator 256 
 
 " Specific Gravity Appara- 
 tus, Schilling 256 
 
 " Stoves 97 
 
 " Tongs 423 
 
 " Washing Bottles 250, 251 
 
 Gasoline Blast Burner 95 
 
 " Burner, Dangler 97 
 
 " Gas Generator 263 
 
 Gasometers 253 
 
 Gasser Grinding and Polishing 
 Machine for thin Sections.. 353 
 
 Gauge, Cover Glass 292 
 
 " Glass Tubing 258 
 
 " Paper Testing 526 
 
 Pressure 258, 289, 290 
 
 Seger Draft 290 
 
 " Vacuum 258 
 
 " " McLeod's 5 
 
 Wire 258 
 
 Gautier Receiver 465 
 
 Gauze, Wire 554 
 
 " Top Burner 97 
 
 Gay-Lussac Hydrometer . 273 
 
 " " Specific Gravity 
 
 Bottles 491 
 
 " " Support 515 
 
 Gayon Culture Tube 172 
 
 Gear, Speed Reducing, for Mo- 
 tors 363 
 
 Gehrke and Reichenheim Spec- 
 trograph 497 
 
 Geissler Air Pump 217 
 
 " Alkalimeter 7 
 
 Filter Pump 217 
 
 Geissler-Wetzel Potash Bulb. 436 
 
 Gelatine and Glue Tester 261 
 
 Generators, Gas 253, 254 
 
 " Steam 508 
 
 Genth Tripod 541 
 
 Genus Covers • 75 
 
 Geological and Mineralogical 
 
 Apparatus 352 to 361 
 
 " Hammers 267 
 
 German Silver Crucible Tongs 539 
 " " Weighing Dish 
 with Counter- 
 poise ISO 
 
 " Wire 554 
 
 Germinator, Grain 262 
 
 Geryk Air Pumps 1,2 
 
 Giddings Low Temperature 
 
 Incubators 32 
 
 Giles Volumetric Flask 226 
 
 Giimore Needle 113 
 
 Glaser Combustion Furnace. . . 236 
 
 Glass Beads 258 
 
 " Blower's Blast Burners.. . 96 
 
 Tables 259 
 
 " Cutter 258 
 
 " Graduates 261 
 
 " Rines for Micro Slides. 335 
 
 " Rod 260 
 
 " Stirrers 260 
 
 " Tubing 260 
 
 " " for Sealing 258 
 
 Pago 
 
 Glass Tubing Cutter 258 
 
 Gauge 258 
 
 " " " -Microme- 
 ter 292 
 
 " Wool 261 
 
 Glasses, Micro Cover 334 
 
 Pick 288 
 
 Reading 288 
 
 Glazed Paper _ 382 
 
 " " for Kymographs 
 
 398 399 
 
 Glinsky Distilling Tube ' 191 
 
 Gloves, Asbestos 14 
 
 " Rubber 476 
 
 Glue Hydrometer 273 
 
 " Testing Apparatus 261 
 
 Gockel Burette Meniscus Read- 
 er 88 
 
 " Condenser 152 
 
 Goetz Phosphorus Tubes 116 
 
 Goggles 261 
 
 Goldschmidt Crystal Model- 
 ling Apparatus . . 352 
 " Goniometers, . 352, 353 
 
 Gomberg Potash Bulb 436 
 
 Goniometers, Goldschmidt. .352, 353 
 " Hutchinson Uni- 
 versal 354 
 
 Penfield 352 
 
 Gooch Crucible, Nickel 159 
 
 Platinum 421 
 
 Porcelain., 15S, 159 
 Filter Tubes . . 218 
 
 Tubing 480 
 
 Graduated Flasks 224 to 226 
 
 Graduates, Glass 261 
 
 Enamel Ware 262 
 
 forMoistureTest... 261 
 
 Graham Dialyzer 176 
 
 (.irain Germinator, Schonjahn. 262 
 
 " Tester, Grobecker 262 
 
 Graphic Chronometers, Jaquet. 400 
 
 Gratings, Replica 504 
 
 Grating Spectroscope, Zeiss .... 499 
 
 Grease, for Stopcocks 511 
 
 Greenman Burner 94 
 
 " Thermo-regulator. . . 537 
 
 Grenet Battery 66 
 
 Grethen Weighing Bottle 553 
 
 Griffin Beakers 69 
 
 Grinding, Crusliing and Pul- 
 verizing Apparatus 161 to 169 
 
 Grinding and Polishing Ma- 
 chine for Thin Sections 353 
 
 Grobeker Grain Tester 262 
 
 Guard for Burners 94 
 
 Guinea Pig Holders 11 
 
 Gummed Labels 282 
 
 H 
 
 Haemacytometers 262 to 265 
 
 Haemaglobinometer 265 
 
 Haematokrit, Daland 115 
 
 Haematology, Apparatus for 
 
 262 to 266 
 Haematology and Cytology, 
 
 Charts of 131 
 
 Haemometers 265 
 
 Haldane Gas Analysis Appara- 
 tus 248 
 
 Half Elements for Physical 
 
 Chemistry 396 
 
 Hall Purinometer 543 
 
 Hammers 267 
 
 Hand Balance ....,,... 58 
 
 " Magnifiers 286 to 289 
 
 " Microtome, B. & L 346 
 
 " Spectrophotometer, Nut- 
 ting 501 
 
 Handles for files 209 
 
 Handle for Zeiss Anastigmatic 
 
 Magnifiers 289 
 
 Harcourt Pentane Lamp 256 
 
 Hard Rubber Bottles 84 
 
 " " Funnels 229 
 
 " " Stopcock 510 
 
 Hardness Testers 267, 268 
 
 " Test Measuring Mi- 
 croscope 295 
 
 Harvard Trip Balance 59 
 
 Hastings Aplanatic Triplets.. 287 
 Hayem-Sahli Haemacytometer, 264 
 Hearson Bacteriological Incu- 
 bators, 24, 25, 26, 29, 31, 
 33 and 35 
 " Coagulator for Blood 
 
 Serum 34 
 
 " Dehydrator 44 
 
 " Drymg Apparatus for 
 
 Serum 193 
 
 " " Ovens, Elec- 
 tric 377 
 
 " Shaking Apparatus. . . 483 
 
 " Sterilizer, Electric 40 
 
 " " Steam, Elec- 
 tric 41 
 
 Water Bath 550 
 
 " " " for Was- 
 
 sernian 
 
 Test 35 
 
 Heaters, Electric (Hot Plates) 268 
 " for Milk Tes- 
 ters 350 
 
 for Flasks 227 
 
 " " " with Hot 
 
 Plate _. 270 
 
 Heating Device for Polari- 
 
 scopes, Landolt 428 
 
 Heating Device, Electric, for 
 Polariscopes, Abderhalden. . . 428 
 
 Heeren Pioscope 350 
 
 Heerwagen Mercury Pippette. . 413 
 Hefner Lamps for Photometers. 385 
 Heidenhain Thermometer for 
 
 Cryoseope 169 
 
 Helm Animal Cage 10 
 
 Heinrici Hot Air Motors 363 
 
 Helber Counting Chamber 263 
 
 Hellendahl Staining Jar 507 
 
 Hentpel Desiccator 175 
 
 " Distillation Flask 222 
 
 " Distilling Tube for 
 
 Tar 19 
 
 " Gas Burettes 251 
 
 " Palladium Tube... 253 
 
 " " Pipettes 257 
 
 Hempel-Friedrichs Gas Pip- 
 ette 256 
 
 Hempel-Winkler Gas Burette 251 
 Heraeus Electric Hot Plates 
 with Temperature 
 
 Regulation 270 
 
 " Elements for Pyrom- 
 eters 451 
 
 " Mercury Vapor Lamp 
 
 of Quartz 503 
 
 " Tube Furnaces 238 
 
 Herman Electrolytic Outfit,.. 197 
 Hess Viscosimeter 267 
 
Pagt 
 
 Hessi;iii Saiiil Crucibles 157 
 
 Hi^h TeiiipcTiLture Burners .... 93 
 " " Drying Ov- 
 ens 375 
 
 " " Furnaces, 
 
 Northrup... 243 
 Hilger Micrometer Microscope 293 
 " Monochromatic Illumi- 
 nator 501 
 
 *' Refractometer 473 
 
 " Spectographs. , , . 497 
 
 " Spectrometers 495 
 
 Hill Pressure Filter 211 
 
 " Weighing Bottle 553 
 
 Hintze Crystal Models 359 
 
 Hipp ChroDoscopes 139 
 
 Hirsch Funnels 229 
 
 Histoiogieal Apparatus for Em- 
 bedding 42 
 
 Hitchens Syringe olg 
 
 Hoffman Clamps 140 to 142 
 
 " Direct Vision Spec- 
 
 " troscope 494 
 
 " Lecture Apparatus . . . 283 
 
 Hofman Sodium Press 438 
 
 Hofmann Water Bath 54S 
 
 Hofmeister ■'Schalchen" 4S1 
 
 Hogarth ."^pL'cific Gravity Bot- 
 tle 491 
 
 Holders, Animal 12 
 
 " for Extension Clamps 140 
 " " Conductivity Cells 391 
 
 " Crucibles 160, 161 
 
 " " Culture Dishes 171 
 
 " " Gas 253 
 
 " " Lenses 313 
 
 " " Microtome Knives 347 
 
 " Needles 182 
 
 " " Spectrum Tubes.. . 506 
 
 Hollow Prism 504 
 
 Holt Milk Testing Set 348 
 
 Homeopathic Vials 545 
 
 Hones 348 
 
 Hooks and Chains 181 
 
 Hopkins Condenser 152 
 
 " " Picard-Law 
 
 Modifica- 
 
 cation 152 
 
 " Kjeldahl Connecting 
 
 Bulbs 366 
 
 Horismascope 543 
 
 Horn Scoop 481 
 
 " Spatulas 490 
 
 " Spoons 506 
 
 Horseshoe Magnets 286 
 
 HortvetTube 542 
 
 Hose, Rubber 478 
 
 Hoskins Electric Combustion 
 
 Furnace 237 
 
 " " Crucible Fur- 
 nace 239 
 
 " " Hot Plates.... 269 
 MufHe Fur- 
 nace 240 
 
 Hot Air Funnels 230 
 
 " " Motors 363 
 
 " " Sterilizers 39, 40 
 
 " Plates, Electric 268 to 271 
 
 " " Gas 268 
 
 " with Flask Heater.. 270 
 
 " Water Funnels 230 
 
 " " Heater for Refrac- 
 
 tometers 469 
 
 Hour Glasses 481 
 
 Hubbard Specihc Gravity Bot- 
 tle 492 
 
 Huber Warming Table 545 
 
 Huggenberg Sapometer 88 
 
 Hnlett Mercury Still 297 
 
 Hiirthle Kymograph 398 
 
 " Piston Recorder 400 
 
 " Spring Manometer .... 400 
 Hutchinson Universal Goniom- 
 eter 354 
 
 Hydraulic Presses 437 
 
 Hydro Carbon Burner for 
 
 Kerosene 97 
 
 Hydrogen Liquifying Appara- 
 tus 285 
 
 " Sulphide Apparatus, 
 
 .Johnson 249 
 
 Hydrometers 271 to 273 
 
 Hydrometer, Asphalt 17 
 
 " Jars 173 
 
 Hygro-Autometer 274 
 
 Hyprodeik 274 
 
 Hygrograph 274 
 
 Hygrometers 274 
 
 I 
 
 Ice Boxes 45 
 
 Her Disc Pulverizer 162 
 
 lUuminants for Projection Ap- 
 paratus 447 
 
 Illuminating Device for Po- 
 
 lariscopes 432 
 
 Illuminating Device for Spec- 
 troscope with Polariscope, 
 
 Nernst 429 
 
 Illumination Tester, Thorner. . 386 
 
 Illuminators, Vertical, B. & L.. 317 
 
 Zeiss ... 324 
 
 Illuminometers, Martens 385 
 
 Wingen 386 
 
 Immersion Electrodes 391 
 
 Oil Bottles 77 
 
 " Refractometer 467 
 
 Immunity Unit Cylinders 174 
 
 " " Pipettes 415 
 
 Impact Ball Tester 267 
 
 Incandescent Gas Micro Lamp . 332 
 Incineration Dish, Alundum... . 178 
 
 Pan, Platinum 421 
 
 Incinerator 275 
 
 Inclinator, Carboy 110 
 
 Incubators, Bacteriological. 21 to 33 
 
 " Embryological 29 
 
 " for Microscopes . . . 333 
 
 Incubator Thermometers 534 
 
 Indicator Potentiometer, Leeds 
 
 & Northrup 451 
 
 " Temperature, Leeds 
 
 & Northrup 452 
 
 Induction Coils 275 
 
 Inductorium, DuBois Reymond 402 
 " for Wheatstone 
 
 Bridge 393 
 
 Injection Needles for Syringes 510 
 
 Syringes 516 to 519 
 
 Ink, Diamond 275 
 
 " Polygraph, Mackenzie . , . , 405 
 
 Innoculating Needles 364 
 
 Insect Pins 412 
 
 Inset, Perforated, for Water 
 
 Bathe 549 
 
 Inspissators, Hearson Electric. 32 
 Instruments, Dissecting , . ISl to 185 
 
 Page 
 
 Instrument Sterilizers 36 
 
 Interferometer for Gas and 
 
 Water- 471 
 
 International Atomic Weights 
 
 for 1913 555 
 
 International Electric Centri- 
 fuges US to 120 
 
 Interval Timer, Thayer 143 
 
 Inversion Tubes for Polari- 
 
 scopes 434 
 
 Inverted Specimen Jars 281 
 
 Iodine Determination Flasks.. . 220 
 Ions, Apparatus for the De- 
 termination of the Migra- 
 tion of 397 
 
 Iron Crucibles 159 
 
 " Dishes 180 
 
 " Mortars 362 
 
 " Wire 554 
 
 Jackson Specific Gravity Ap- 
 paratus 114, 
 
 " Turbidimeter 
 
 Jam Jars 
 
 Janus Blast Burner 
 
 Japanese Lens Paper 
 
 Jaquet Curve Analyzer 
 
 Graphic Chronometers.. 
 
 Metronome 
 
 Portable Polygraph 
 
 Respiration Apparatus.. 
 Sphygmocardiograph, . . 
 
 Spirometer 
 
 Jars, Animal 11 
 
 Aquaria 
 
 Battery 
 
 Bell 71 
 
 Brain , 
 
 Calcium Chloride 
 
 Dressing , 
 
 Hydrometer 
 
 Inverted Specimen 
 
 Jam , . , . 
 
 Lightning 
 
 Mixing 
 
 Museum 276 to 
 
 Precipitating . , 
 
 Safety Valve 
 
 Screw Cap 
 
 Staining 
 
 Stoneware 
 
 Waste 
 
 Jeffers Counting Plate 
 
 Jena Glass Test Tubes 
 
 Jennings Kjeldahl Connecting 
 
 Bulb 
 
 Jewell Stills 
 
 Johnson Apparatus for Deter- 
 mining Hydrogen Sul- 
 phide in Gases 
 
 " Clay CombustionBoats 
 
 " Clay Combustion 
 
 Tubes 
 
 " Kjeldahl Digesting 
 
 Shelf 
 
 " Milling Machine 
 
 Jolly Spiral Spring Balance .... 
 Jones Boiling Point Apparatus. 
 
 " Redactor 
 
 " Sampler 
 
 Julian Color Comparison Tubes 
 Junkers Gas Calorimeters . . 108, 
 
 400 
 400 
 407 
 404 
 406 
 404 
 
 280 
 173 
 281 
 281 
 281 
 S4 
 281 
 282 
 281 
 281 
 507 
 282 
 282 
 155 
 520 
 
Page 
 
 K 
 
 KaeWerDrviiifv Ovens 375, 376 
 
 Kawin Crucible 159 
 
 Keidel Blood Collector 267 
 
 Keen Impact Ball Tester 267 
 
 Kekule-von Baeyer Atom Mod- 
 els 19 
 
 Kennicott-Campbeli-Hurley Co- 
 lorimeter 144 
 
 Kerosene Hydro Carbon Burn- 
 er 97 
 
 " Micro Lamp 332 
 
 " Polariscope Lamp. , . . 433 
 
 Keys, Contact 395 
 
 " Electrometer 395 
 
 " Plug 395 
 
 " for Wheatstone Bridge.. 393 
 Kinotherm (Shaking Appara- 
 tus) 484 
 
 Kipp Generator 253 
 
 Kirchbraun Cementation and 
 
 Ductility Machine 15 
 
 Kirchbraun-Sargent Adhesion 
 
 Machine 15 
 
 Kirchoff-Bunsen Spectroscopes 494 
 
 Kirkbride Slide Forceps 228 
 
 Kitasato Animal Holder 11 
 
 " Filter Apparatus 209 
 
 Ejeldahl Apparatus for the 
 Determination of Ni- 
 trogen 364 to 366 
 
 " Connecting Bulbs. . . . 366 
 
 " Flasks 223 
 
 Elaeger Insect Pins 412 
 
 Knife, Brain 181 
 
 Cartilage 181 
 
 " Cork 282 
 
 " Microtome 347 
 
 " Sectioning , . 347 
 
 Virchow 181 
 
 Knife Holders for Microtome 
 
 knives 347 
 
 Knorr Extraction Apparatus . . 206 
 
 Flask 205 
 
 Kny Botanical Charts 126 
 
 Koch Bacteria Grinding Ap- 
 paratus 167 
 
 " Culture Flasks 171 
 
 " Safety Burners 98 
 
 Kohl Specific Gravity Bottle , - - 491 
 Kohlrausch Conductivity Cells 390 
 " Model for Lecture 
 Table Demonstra- 
 tion of the Migra- 
 tion of Ions 397 
 
 Slide Wire Bridge. 394 
 
 Sugar Flasks 226 
 
 Kohlrausch-Holborn Conduc- 
 tivity Cell 390 
 " " Platiniz- 
 ing Solu- 
 tion 394 
 
 Kohlraiisch-Ostwald Apparatus 
 for the Determination of the 
 Conductivity of Electrolytes 390 
 Kolkwitz Plankton Magnifier... 28S 
 
 Kolle Culture Flasks 171 
 
 " Innoculating Needles .... 364 
 
 Konig Centrifuge 123 
 
 " Differential Manometer 290 
 " Spectrophotometer with 
 
 Wanner Pvrometer 457 
 
 Korner Drug Mill 165 
 
 Kossel Sodium Press 438 
 
 Past 
 
 Krijger Battery,. 460 
 
 Kriiss Spectro-Goloriraeter . . . . 145 
 " Universal Spectroscope. . 497 
 
 Kuster Anaerobic Culture Ap- 
 paratus 8 
 
 Kymographs 398 
 
 L 
 
 LaBel-Henninger Distilling 
 
 Tubes '. 191 
 
 Labels, Dennison 282 
 
 Micro Slide 335 
 
 Label Books 283 
 
 Lactic Acid Funnel, Straus. . . , 231 
 
 Lactokrit, Stewart 116 
 
 Lactometers 348 
 
 Lactoscope, Feser 349 
 
 Ladenburg Distillation Flask . . 222 
 
 Lambrecht Hygrometer 275 
 
 " Polymeter 275 
 
 LaMotte Calcium Chloride 
 
 Drying Tube 99 
 
 Lamps, Alcohol 283 
 
 " Harcourt Pentane 256 
 
 " Hefner, for Photom- 
 eters 385 
 
 " Mercury Vapor 502 
 
 " Microscope 331 
 
 " Photometer Standard. . 385 
 
 " Polariscope 433 
 
 " for Projection Appa- 
 ratus 447 
 
 " Spectrum 502 
 
 Lamp Wieking 283 
 
 Lancets for Blood 267 
 
 Landolt Heating Device for 
 
 Polariscopes 428 
 
 " Polariscopes 427, 429 
 
 " Polariscope Lamp 434 
 
 Tubes 435 
 
 Landouzy and Labbe Charts of 
 
 Haemotology and Cytology . . 131 
 Lantern Slide Enlarging Out- 
 fit 439 
 
 Lautenschlaeger Filter Paper 216 
 " Hot Air Ster- 
 ilizer 39 
 
 La Wall Separatory Funnel 231 
 
 Leach Separatory Funnel Sup- 
 port 233 
 
 Lead Dishes ISO 
 
 " Pipe 412 
 
 " Shot 283 
 
 Leather and Cloth Tester, 
 
 Schoppcr 525 
 
 LeChatelier Pyrometer 451 
 
 " Soundness Test 
 Apparatus for Ce- 
 ment 112 
 
 " Specific Gravity 
 
 Bottles 114, 492 
 
 Lecture Apparatus, Hoffman. , . 283 
 
 " Table Balances 54 
 
 Leeds Diamond Mortar 362 
 
 Leeds & Northrup Resistance 
 
 Box 394 
 
 Slide Wire 
 
 Bridge 394 
 
 Lehmanr Cardiograph 407 
 
 Extraction Tube 205 
 
 " Pneumograph 407 
 
 " Sphygmograph 407 
 
 Lendenfeld Charts of Human 
 
 Anatomy 124 
 
 Lenses, Pocket 286 
 
 Pase 
 Lenses for Projection Appa- 
 ratus 447 
 
 " Quartz 504 
 
 Rocksalt 504 
 
 " Zeiss Anastigmatic for 
 
 Dissecting, etc 288 
 
 Lens Holders 318 
 
 " Paper 284 
 
 " IL-.ig 289 
 
 Lentz .(Vnaerobic Culture Ap- 
 paratus 8 
 
 Leptometer .370 
 
 Leuckart-Chun Zoological 
 
 Charts 134 
 
 Levelling Bulb for Gas Bu- 
 rettes 251 
 
 Level Support 284 
 
 Liebig Condensers. ... 152 
 
 " Drying Tubes 193 
 
 " Potash Bulb 436 
 
 Liebig-Dittmar Potash Bulb. . , , 436 
 Liebig-Kyir " " . , 436 
 Liefmann-Meier Water Bath. . . 36 
 Light Filters, Wratten & Wain- 
 wright, for Micro-Photogra- 
 phy 342 
 
 Lightning Jars 281 
 
 Lillie Compartment Paraffine 
 
 Embedding Oven 42 
 
 Lime-Sulphur Hydrometer 273 
 
 Lincoln Burette Clamp 141 
 
 Linen Tape Measure 291 
 
 Testers 288 
 
 Lintner Pressure Bottle 84 
 
 Lippich Polariscope 426 
 
 Liquid Air Apparatus 284 
 
 Lister Culture Flask 171 
 
 Litmus Pencils 382 
 
 Lohnstein Saccharometers 544 
 
 Lomschakow Gas Analysis Ap- 
 paratus 246 
 
 Lothar-Meyer Drying Ovens .. , 375 
 " Hot Air Funnel . 230 
 Lovibond Tintometer and Ac- 
 cessories 148 
 
 Low Flask for Copper Deter- 
 minations 218 
 
 Low Temperature Burners 97 
 
 " " Incubators, 
 
 Hearson 31 
 
 " " Incubator 
 
 Giddings .... 32 
 " " Thermome- 
 ters 533 
 
 " " Thermostat.. 285 
 
 Lucksch Bacteriological Charts 125 
 
 Ludwig Electrodes 402 
 
 Ludwig-Cyon Mercury Man- 
 ometer 400 
 
 Luer Syringes 519 
 
 Luminescence Microscope and 
 
 Accessories, Zeiss 328 
 
 Lummer-Brodhun Photometer 
 
 Sight-Box 384 
 
 Lummer-Straubel Mercury Va- 
 por Lamps 502 
 
 Lunge Distillation Flask 222 
 
 " Nitrometers 367 
 
 " Weighing Bottle 553 
 
 Luther Capillary Electrometer 
 
 Tube 395 
 
 Platinum Electrodes. ... 396 
 
 Stirring Device 393 
 
 Lux Gas Balance 250 
 
 Lymph Grinding Apparatus.. . . 168 
 
M 
 
 Maassen Filter Cylinder 210 
 
 Macfaedyen Bacteria Grinding 
 
 Apparatus 167 
 
 Mach Decimal Balance 54 
 
 " Immersion Oil Bottle. .. . 77 
 
 Mackenzie Ink Polygraph 405 
 
 Macro and Micro Polariscopc . . 427 
 
 Magnalium Balances 57 
 
 Magnetic Field Electrolysis 
 
 Apparatus 200 
 
 Magnets 286 
 
 Magnification Table 322 
 
 ^lagnifiers, Bausch & Lomb. . . . 286 
 " Zeiss Anastigmatic. 288 
 
 " for Balances 64 
 
 Magnifier Stands, Adjustable. . 313 
 
 Mahler Bomb Calorimeter 102 
 
 Mailing Cases for Micro Slides 335 
 
 Mall Seeker, or Probe 184 
 
 Maltwood Finder 324 
 
 Manganese Tubes for Color 
 
 Comparison, Camp 143 
 
 Manometers 289 
 
 Manometers for Physical Chem- 
 istry 400 
 
 Mantels for Berkefeld Filters . . 210 
 " " Welsbach Lamps.. . 331 
 
 .Marchand Calcium Chloride 
 
 Tubes 100 
 
 Marey Tambours 401 
 
 Marey-Straub Tambour 401 
 
 Markers, Signal 401 
 
 Marquardt Combustion Tubes. . 149 
 " Pyrometer " .. 450 
 
 Marking Apparatus for Micro 
 
 Objects 333 
 
 Marshall Apparatus for the 
 Determination of Urea in 
 
 Blood 260 
 
 Martens Densitometer 387 
 
 " Direct Vision Spec- 
 troscope 493 
 
 " Illuminometer 385 
 
 " Polarisations Photo- 
 meter 386 
 
 " Relative Photometer. , 385 
 
 Martin Culture Flask 172 
 
 " Double Jet Water Cen- 
 trifuge 117 
 
 " Filter Apparatus 209 
 
 Mason Hygrometer 274 
 
 Mats, Asbestos 14 
 
 Matthews Water Bath 551 
 
 Mattrasses for Blowpiping 286 
 
 Maximum and Minimum Ther- 
 mometers 635 
 
 McCoy Boiling Point Appara- 
 tus 389 
 
 " Gas Generator 253 
 
 McLeod Anaerobic Culture Ap- 
 paratus 8 
 
 " Vacuum Gauge 5 
 
 McMyn Weighing Bottlo 553 
 
 McNeill High Vacuum Rotary 
 
 Pump 6 
 
 Measuring Appliances 290 
 
 " Microscopes 291 
 
 Measures 290 
 
 Measure for Acid in Milk Test 3.50 
 
 " Tape 291 
 
 Measuring Cones 291 
 
 " Tubes for Gas 253 
 
 Meatchopper 297 
 
 Page 
 
 Mechanical Stages, B. it L 316 
 
 Zeiss 320 
 
 " Stirrer for Mole- 
 cular Weight De- 
 termination Appa- 
 ratus 389 
 
 Medicine Droppers 412 
 
 Medium Laboratory Micro- 
 tome 343 
 
 Melting Point Tube 297 
 
 Mendelejeff Charts of the Ele- 
 ments 130 
 
 " Periodic System of 
 
 the Elements 555 
 
 Meniscus Reader for Burettes. . 88 
 
 Mercury Commutator 395 
 
 " Manometers 400 
 
 " Pipettes 413 
 
 Still, Hulett 297 
 
 Troughs : 297 
 
 " Vapor Lamps 502, 503 
 
 " *' Arc Lamp, for 
 
 Microscopes.... 332 
 " \A'ells for Armored 
 
 Thermometers 534 
 
 Mesurl and Nouel Optical Py- 
 rometer 455 
 
 Metallic Tubing, Flexible 542 
 
 Metallographic Apparatus 298 to 303 
 " Microscope and 
 
 Camera, Tassin 300 
 Metallurgical Microscopes 298, 
 
 300,301,302 303 
 
 Meters, Gas 255 
 
 " " Bohr 404 
 
 " " for Junkers Ca- 
 lorimeter 108 
 
 Meter Sticks 290 
 
 Metric Tables 556 
 
 Metronome, Jaquet 400 
 
 Metzner Respiration Valve .... 403 
 Meyer Anaesthetizing Cham- 
 bers 403 
 
 " Artificial Respiration 
 
 Apf)aratus 403 
 
 Cylinder for Hydraulic 
 
 . 437 
 " Dissecting Microscope. 327 
 
 " Sulphur Apparatus 512 
 
 Mica Covers for Brain Sections 334 
 
 Mice Holders 11 
 
 Micro Balance 53 
 
 " Burner 91 
 
 " Cover Glasses 334 
 
 " Drawing Apparatus 317 
 
 " Labels for Slides 335 
 
 " Lamps 331 
 
 " Object Marking Appa- 
 ratus 333 
 
 " Slides 334 
 
 " Slide Boxes 335 
 
 " " Cabinets 336 
 
 " " Mailing Cases 335 
 
 " " Trays 336 
 
 " Tubes for Polariscopes, 
 
 Fischer 434 
 
 " Warm Stages 333 
 
 Micrometer, for Cement Ill 
 
 Stage, B. &L 316 
 
 " " Zeiss 324 
 
 Micrometer Calipers 290 
 
 " Microscopes. .291 to 295 
 
 Oculars, B, & L., , . 316 
 
 Zois.s. . . .324 
 
 Page 
 
 Micrometer Ocular, Net, for 
 
 Blood Counting.... 264 
 Micro-Photographic Apparatus 
 
 337 to 342 
 " " Apparatus 
 
 for Met- 
 allography 298 
 " " Drawing 
 
 and Projec- 
 tion Appa- 
 ratus Com- 
 bined 339 
 
 Micro Polariscope, Fischer 429 
 
 Microscopes and Accessories 
 Bausch and Lomb 
 
 304 to 317 
 " and Accessories. 
 
 Zeiss 318 to 330 
 
 Microscope, for Nernst Bal- 
 ance 53 
 
 Binocular, B. & L 312 
 Chun.. 330 
 " Zeiss.. 325 
 
 " Crystallographic, 
 
 Zeiss 330 
 
 " Demonstration, 
 
 B. &L 311 
 
 " Dissecting, B. & L 313 
 
 " Meyer 327 
 
 " Luminescence, 
 
 Zeiss 328 
 
 " Measuring 291 
 
 Metallographic 298300 
 
 " Micrometer 291 
 
 " Petrographical... . 355 
 
 Portable, B. & L. 311 
 
 " " Zeiss. . . 323 
 
 " Projection 446 
 
 " Reading 296 
 
 Ultra, Zeiss 329 
 
 Microscope Lamps 331 
 
 Oven 333 
 
 Microspectral Objective, En- 
 
 gelmann 324 
 
 Microspectroscope, Abbe 324 
 
 Micro-Tessar Objective 342 
 
 Microtomes and Accessories. 343 
 
 Mieschet Mixing Pipette 263 
 
 Migration of Ions, Kohlrausch 
 
 Apparatus for 397 
 
 Migration Tube 396 
 
 Milk Fat Refractometer 466 
 
 " Pipette for Counting Bac- 
 teria 413 
 
 " Testing Apparatus . , 348 to 351 
 
 Milling Machine, Johnson 164 
 
 Milliammeters and Ammeters . . 200 
 Millivoltmeters and Voltmeters 200 
 
 Mills 161 to 169 
 
 Minerals, Radio-Active 460 
 
 Mineral Oil Distillation Ap- 
 paratus, Engler 373 
 
 " Sectioning Apparatus. 352 
 Mineralogical, Crystallographic 
 and Petrographical Appara- 
 tus 352 
 
 Mineralogical Collections 361 
 
 " Hammers 267 
 
 Minot Metal Micro Slide Cabi- 
 net 336 
 
 " Automatic Precision Mi- 
 crotome 344 
 
 " Rotary Microtome 344 
 
 Minute Glasses 481 
 
 Miquel Culture Flasks 171 
 
H 
 
 Mitstherlich Dcsicr 
 
 I'dhiri: 
 Mixiiic Hn 
 
 I'll' 
 
 Ion 
 rU, Ah 
 
 yliiidci 
 
 I'l 
 
 Naples .III! 
 
 lllij(-rl 
 XlT.llrs, Diss-', 
 
 IlililK 
 
 I's 
 
 , Zi'i 
 
 of l;!,o 
 
 -Moa,.|,„^ A|,|,; 
 
 inl,olir,lrni 
 ii-hUis lor 
 
 this. Col Isi-ll 
 
 
 MohrConJchish 
 
 ,. 
 
 •• I'inrlu-ocl 
 
 iS 
 
 " I'llK'ttca. 
 
 
 " Poliish H 
 
 ulba.. 
 
 Moissan Klhctr 
 
 ir Aic Flirt 
 
 Moist Chill, iIhi- 
 
 
 " " 
 
 Hotlrlior 
 
 Mnistiiiv It:,l:iii 
 Tcsl 1 
 
 'vliu.lvr 
 
 " lli-ailiiiilio , 
 .\lolc.tuhir Air Piuiip, (iacil,. 
 
 Wi-ialit Dclcmiiiui- 
 
 .Moiiohhr 
 
 Illii 
 
 IH* 
 
 li.rs,, oiai, JOl 
 
 Mirrii Lamp, 
 
 Ziiss 332 
 
 Moore .Stainiiii: Disli, ,307 
 
 Morochowetz I'illir l'a]i(r 2ir; 
 
 I'riiiiirl L'.'ll 
 
 Morse Calihiatinsi lliinl lis ^s 
 
 " Rendiiiiuuto (Il\-(lriHii- 
 
 eter) " 273 
 
 Mortars 362 
 
 Motors, Electric 363 
 
 Hot Air 363 
 
 Walrr., , .3112 
 
 Moiilila, Bri Il,r, .\si.lrill I.". 
 
 I Villi, III 111 
 
 ('ill, ii III, for ,\s|iliiilt , l.r 
 
 (■||,i,-l, 172 
 
 Firrli , , l.s 
 
 " Pourinff, 364 
 
 Mounting Paper, Botanical , , 7."i 
 
 Mouse Jars 11 
 
 Mouth Pieces for Blowpipes, 74 
 
 Muencke Filter Pump 217 
 
 " Gas Washing Bottle, , 251 
 
 Muffles, Alundum 364 
 
 " Battersea, , , 361 
 
 Silica , 364 
 
 Muffle Furnaces, Fliitilur 23,'i 
 
 " " Hoskiiis, , 210 
 
 WcisiicKn 23,-. 
 
 Multiple Tube Burners 61 
 
 Munklell Filter Paper _ 213 
 
 Mnseuiii -Jars 2|6 to 2S1 
 
 Nivillc ,\ 
 
 II 
 
 Neisser I 
 
 '1 
 
 Nernst < 'i 
 
 Ne-ssler Culo 
 
 ■I'ulics 1 13 
 
 4'iilioSii|ipiirl , , , lit 
 
 Nestler.Sliili, Uul,, -Ixii 
 
 Nets fur r , P.lomrs 73 
 
 \rl i;iiTl roilcs, Xirkol, 
 
 fisrlirr 1!I6 
 
 " Miir rlrr for Ociilais 
 
 for 111 I (■ iting 264 
 
 Neubauer-Biirker Haemacyto- 
 
 mclcr, 263 
 
 Xii'lin.iiih Wire 5,54 
 
 Nickel I3ir iiiiii 3'rianglcs-,, , 540 
 
 ■■ Criirililcs 159 
 
 " Crucible Tungs 539 
 
 Dishes 180 
 
 Net Electrodes, Fischer 199 
 Spatulas 490 
 
 Spoons, , , , :>m 
 
 " 4-rian-les ,-,10 
 
 "Hire ,-,51 
 
 Nicol Prism, .Model 111, \rl.ii 3.57 
 
 SpiTiiir CriixiU Hiillle 161 
 
 Ninliydriii " 177 
 
 Nissenson Swilrh Biiiinl for 
 
 Electrolysis 19.S 
 
 Nitrogen Bulbs 366 
 
 " Determination Ap- 
 paratus 364 to 367 
 
 Nitrogen, Urea and Ammonia 
 111 Urine, Folin Apparatus 
 
 for 543 
 
 Nitriiiiirtcrs 367 
 
 Nnnniil Iflr iils, (111111111110,,, 396 
 
 'llicl inrlors ,531 
 
 Norria Pnliisli liiilli , , 4,30 
 Norlhrup llii;li rini|iirat iirc 
 
 KliTtrir Fiuiiiircs , , , 243 
 
 Niiscpicics, Piiiiisili ,V Liiiiib, ,, 315 
 
 ZeLss , , , 324 
 Novy ,Viiaeriiliic Culture Afipa- 
 
 ratus ,S 
 
 " Coyer Class porrcps 227 
 
 Nutting Hand Spectrophotom- 
 eter,, ,,, 501 
 
 " Polarisation Photom- 
 
 eler ,Utacliiiieut 490 
 
 Piccision Ciiliirimeter,, 146 
 
 o 
 
 (ibierl Cliintiis fur .Micr.il ■imes 316 
 
 llol.Irr, Wiilf 2^6 
 
 '■ Miirkinir,\ppanitus,,,, 333 
 
 Slides, ,Mi. ro 334 
 
 llbirrtlvfs, riitiisl, Zeiss 326 
 
 Zeiss 321 
 
 (IbjecliyeChanser, Zeiss 324 
 
 324 
 
 ,\il|tlstiil,lr, Zei 
 
 Fliilirli 265 
 
 lliilllllc Itr IslllillllK 333 
 
 S drill, .Milic 324 
 
 llniliir llni]ilitiiiiiii Oir lllood 
 
 Count Ills ,,. 264 
 
 .Miriiinict.is, Zeiss .. 324 
 
 Miri ct. I IJisis, IS. 4 
 
 1, . 316 
 
 Ncl Mieroineler, for 
 Pdoiid Counfiiis, , , , 264 
 Oliin's Liiiv Deiniiiistiiilioii \],- 
 
 -alus. 195 
 
 nil Siini|,l|, llotlli-s S4 
 
 - Sinn,, 182 
 
 " 4'i-sliiiB ,\|i|iariitus,,,,368to373 
 .Maidiine, Thurston 373 
 
 cititiiient Pots 281 
 
 < ilsen's Testing Machine for 
 
 Cement, " ,,112 
 
 Olszewski l.lijiinl ,\lr ,\]i]iara- 
 
 tiis , ,, 384 
 
 'riier still fur Low 
 
 Pressures , , . 285 
 
 llpsiinie llictlbiiliirs .... 36 
 
 nptiial Pvr ler, Alesiite & 
 
 Xouel 455 
 
 " " W aimer . . . 456 
 
 Ore Grinders 163 
 
 Organic Analysis Furiiaee Her- 
 
 aens-Dcnnstcdt 239 
 
 " Tissue Grinding Ap- 
 paratus 167 to 169 
 
 Orlovius Flask 220 
 
 Orsat-Allen and Moyer Gas 
 
 Analysis ,\|i|iiirat us 245 
 
 Orsat-bennis Ciis .Analysis .\]i- 
 
 Orsat-Flseher Cits \tiiiKsis 
 Appiiralus 215 
 
 Orsat-Lunge (l.-i-. Aii:dysis Ap- 
 paratus ll'y 
 
 Orsat-Muencke ( i:is Aiuilysi.s 
 Apparatus -4.3 
 
 Osmoscope n7 
 
 Osram Photometer LfLiii|i-- :i^') 
 
 Ostwald Binding Po; 
 
 :apill 
 
 Kl 
 
 Cliiiiip 1411 
 
 CntL.liirtiviiy Ceils.. . .M) 
 " Ciuistanl Tpm])erii- 
 
 ture Baths 392 
 
 Kic.'tn-Hle Cells 390 
 
 ELiTtrii-diolive Force 
 Determination Appa- 
 
 tus 390 
 
 " P'unnel .Support 232 
 
 Pipette 413 
 
 " '■ for Folin Ap- 
 paratus 543 
 
 Theniiiisi;,ls, . .. 39-' 
 
 TnlunI IN-nhiinvs ... 393 
 \'is.-ns,iv Dcifi'tnina- 
 l.i.tu Oniiii .... 397 
 
 Oslwald-Kohlrausth .\ppaia- 
 lus for the Detennin.il imi 
 i'\' (he Conductivity of Klec- 
 
 Irnlvtes ■ -VM) 
 
 Oven for ^Vsphalt Teslin- lo 
 
 Coniiitniriing, ]Mln■■^^^.^l, .">-'n 
 
 ■' Drviiit: '. . . :-;74tn :;si 
 
Oven for Melting Point of Hard 
 
 Pitch 18 
 
 " for Microscopes 333 
 
 " Paraffine Embedding 42, 43 
 
 " Vacuum 379 to 3S1 
 
 Oxygen Capacity of Blood 
 Apparatus, Barcroft and 
 
 Haldane 405 
 
 Oxygen Cylinders '252 
 
 Pail, for Waste 546 
 
 Paired Objectives, Zeiss 326 
 
 " Oculars " 326 
 
 Paleontological Charts 132 
 
 Palladium Tube for Gas An- 
 alysis 253 
 
 Palm Oil Soap 348 
 
 Pamquist Gas Analysis Ap- 
 paratus 249 
 
 Pans for Balances 64 
 
 " Calorimetry, Platinum 422 
 
 " Cement 114 
 
 " Dissecting 53S 
 
 " Incinerating, Platinum. . . 421 
 
 Paper, Asbestos 14 
 
 " Dialyzing 382 
 
 " Drying, Botanical 75 
 
 " Emery 205 
 
 " Fat Extracted, for 
 
 Milk Analysis 350 
 
 " Filter 213 to 216 
 
 " Glazed 382 
 
 " " for Kymographs. 398 
 
 " Lens 284 
 
 " Mounting, Botanical.. . , 75 
 
 " Parchment 382 
 
 " Pressing, Botanical. 75 
 
 Paper Filtering Cones 215 
 
 " Testers, Sehopper 525 
 
 " Thickness Gauge 526 
 
 Paraboloid C'ondensers, B. & L. 315 
 Siibpffipe Conden- 
 
 srr.s, Zeiss 320 
 
 I'arafhnc Embedding Bath 43 
 
 Box 348 
 
 Ovens... 42, 43 
 
 Table 348 
 
 Parasite Incubator, Hearson.. . 30 
 Parasitic Protozoa and their 
 
 Carriers, Charts of . . 131 
 
 Parchment Paper 382 
 
 Parr Carbnii Apparatus 110 
 
 " (.las Calorimeter 107 
 
 " Oxygen Bomb Calorim- 
 eter 102 
 
 " Standard Calorimeter. . . . 101 
 
 " Sulphur Photometer 512 
 
 Paschen Galvanoscope 201 
 
 Paste Boar<l Boxes 85 
 
 Pasteur Culture Flask 172 
 
 Pasteur-Chamberland Filter 
 Cyli 
 
 Pastille Pref 
 
 Payne Platinum Dish. 
 
 Pebble Mills 
 
 Peligot Calcium ( 
 Tubes . 
 
 Pics.- 
 Filt<' 
 
 210 
 
 389 
 421 
 
 Pellet Pola 
 
 icope Tube 435 
 
 Pencils, Utmus 382 
 
 Pencils, Wax 382 
 
 Penetrometers 15 
 
 Schutte 18 
 
 Penfield Application Goniom- 
 eter 352 
 
 Pennock and Martin Crucible. . 159 
 Pensky-Martens Flash Point 
 
 Testers 369 
 
 Pentane Lamp, Harcourt 256 
 
 " Thermometers for Low 
 
 Temperatures 533 
 
 Peptone, Silk 177 
 
 Percentage Scale for Cement. . . 113 
 
 Percolators 382 
 
 Percolator Bottle 382 
 
 Perforated Porcelain Plates for 
 
 Funnels 419 
 
 Permeability Testing Apjiara- 
 
 tus 114 
 
 Permin Safety Pipette .. 414 
 
 Perot-Fabry Mercury Wipor 
 
 Lam]D 503 
 
 Per Se Sieve Shakers 488 
 
 Peters Electrolytic Support 199 
 
 Petersen-Palmquist-Anderson 
 
 Gas Analysis Apparatus.,,. 249 
 
 Petri Dishes 170 
 
 Petrographical, Crystallograph- 
 ic and Mineralogical Appa- 
 ratus 352 to 361 
 
 Petrographical Charts . 133 
 
 " Microscopes 
 
 355 to 357 
 
 Petrological Collections 361 
 
 Pfeiffer Micro Warm Stage 333 
 
 Pfurtscheller Zoological Charts 
 
 134 
 
 Phillips Beakers 71 
 
 Phipps Institute Animal Cage 11 
 Phosphoric Acid Flask, Volu- 
 metric 224 
 
 Phosphorus Tubes, Goetz 116 
 
 Photographic Camera for Spec- 
 troscopy 494 
 
 " Plates, Wratten 
 
 and Wainwright 
 for Spectroscopy, 506 
 " Register, Dodge.. 409 
 
 Photometers and Accessories 
 
 382 to 387 
 
 Photometer Sector 498 
 
 Spcctro 496 
 
 " Sulphur Parr 512 
 
 Photometer Sight-Box 384 
 
 " Standard Incan- 
 descent Lamps .... 385 
 Photo-Micrographic Appara- 
 tus 337 to 342 
 
 Photo-Micrographic Apparatus 
 
 for Metallography 298 
 
 Photo-Micrographic, Drawing 
 and Projection Apparatus 
 
 Combined 339 
 
 Photosynthometer 417 
 
 Physical Chemistry Apparatus 
 {Not including Apparatus 
 for Quantitative Electroly- 
 sis) 388 to 397 
 
 Physiological and Clinical Ap- 
 paratus 398 to411 
 
 Picard-Law Modification of 
 
 Hopkins Condenser . . , 152 
 
 Pick Glasses 288 
 
 Pill Boxes 85 
 
 " Knives 490 
 
 Pi. 
 
 Pill Tiles 
 
 Pillsbury Boxes 
 
 Pins, Insect 
 
 Pinchcocks, Mohr 
 
 Pinning Forceps 
 
 Piorkowski Culture Flask 
 
 Pioscope, Heeren 
 
 Pipe, Block Tin 
 
 " Lead 
 
 Pipe Wrench 
 
 Pipe-Stem Triangles 
 
 Pipettes 
 
 " Automatic 
 
 Blood, Wright 
 
 " Certified 
 
 " Dropping, , , 
 
 Gas 
 
 " Hacmacytometer 
 
 " Mercury 
 
 Milk, Babeock 
 
 " Ostwald, for Folin Ap- 
 paratus 
 
 " Serological 
 
 " Transfer 
 
 " Viscosity, for Glue, , , , 
 
 " Oil 
 
 " Volumetric 
 
 Pipette Boxes 
 
 " Rest 
 
 " Supports... . , . , . . . 
 
 Piston Recorder, Htirthle . . . , , 
 
 Pitch :\IouW . . 
 
 Pitchers, .\i.-id 
 
 PlacentaprjitiiTir 
 
 Plankton Magriihir 
 
 Plant P:i I holngy Charts 
 
 " Physiology Apparatus, 
 
 Ganong 416 to 
 
 " Physiology Charts 
 
 Press. . ," 
 
 Plasticine for .Anaerobic Cul- 
 ture Apparatus 
 
 Plates for Air Pumps 
 
 " Color Reaction 
 
 for Desiccators 
 
 " Glass, for Cement ...... 
 
 " Hot, Electric 
 
 " Gas 
 
 " " with Flask Heater.. 
 
 " Petri, Culture , , . 
 
 " Perforated, Porcelain, 
 
 for Funnels 
 
 " Photographic, Wratten 
 & Wainwright, for Spec- 
 troscopy 
 
 " Porous 
 
 " Silica 
 
 " Streak 
 
 Plate Holders for Micro-Pho- 
 tographic Apparatus 
 
 Platmid Wire for Inoculating 
 
 Needles 
 
 Platinizing Solution 
 
 Platinum Ware 420 to 
 
 " Blowpipe Tips 
 
 " Electrodes 
 
 " Needles 
 
 " Resistance Calorim- 
 eter Thermometer,,. 
 " Resistance Thermom- 
 eters 
 
 " Rhodium Couple for 
 Brown Pyrometers 
 Wound "Tube Fur- 
 naces. Herae\i8 
 
 412 
 335 
 412 
 142 
 227 
 I7J 
 350 
 412 
 412 
 423 
 539 
 412 
 412 
 267 
 414 
 412 
 256 
 263 
 413 
 350 
 
 543 
 413 
 413 
 
 261 
 370 
 413 
 
 415 
 415 
 412 
 400 
 18 
 
 419 
 175 
 419 
 
 364 
 
 394 
 422 
 74 
 396 
 364 
 
 105 
 
 453 
 
 450 
 
 238 
 
Page 
 
 Piattner Crucible 159 
 
 " Diamond Mortar 362 
 
 Plehn-Nuttal Microscope Oven 333 
 
 Pleier "Raumwinkelmesser". . . 386 
 
 Plesch Chromophotometer 147 
 
 Pliers 423 
 
 Plucker Spectrum Tubes 505 
 
 Plug Key 395 
 
 Plumbago Crucibles 157 
 
 Pneumatic Troughs 42iJ 
 
 Pocket Magnifiers 286 
 
 " Spectroscope 492 
 
 " Thermometers 535 
 
 Pohl Commutator 402 
 
 Polarisation-Colorimeter 145 
 
 Polarisations Photometer, Mar- 
 tens 386 
 
 Polarisations Photometer, Nut- 
 ting 496 
 
 Polanscopes and Accessories 
 
 424 to 435 
 Polariscopes for General Pur- 
 poses 426 to 428 
 
 " " Sugar Analy- 
 sis 430, 431 
 
 " " Urine Analy- 
 sis 424 
 
 Polariscope Cases 432 
 
 " Cover Glasses 435 
 
 " Illuminating De- 
 vice, Electric 432 
 
 " Lamps 433 
 
 Test Plates 435 
 
 " Tubes 434 
 
 Polarizers for Microscopes, B. 
 
 &L 317 
 
 Policemen, Rubber 476 
 
 Polishing and Grinding Ma- 
 chine for thin Sections 353 
 
 Polygraphs for the Study of 
 
 the Circulation 405 to 411 
 
 Polymeter, Lambrecht 275 
 
 Poppe Shaking Apparatus 484 
 
 Porcelain Burner 92 
 
 " Casseroles 110 
 
 " Combustion Boats . . . 149 
 
 " " Capsules 149 
 
 Tubes... 149 
 
 " Crucibles 15S 
 
 " Culture Dishes 170 
 
 " Evaporating Dishes, . 178 
 
 Funnels 229 
 
 " Mercury Troughs 297 
 
 Mills 164, 166 
 
 Mortars 362 
 
 " Pipette Support 415 
 
 " Plates for Color Re- 
 
 actions. . . . 419 
 
 " " " Desicca- 
 
 tors ....... 175 
 
 " Funnels... 419 
 
 Retorts 474 
 
 Rings 475 
 
 " Shelf for Pneumatic 
 
 " Troughs 423 
 
 Spatulas 490 
 
 " Spoons 506 
 
 " Swimming Cups 515 
 
 Trays 538 
 
 " Tray for Sputum 
 
 Analysis. 506 
 
 " Tubes for Heraeus 
 
 Elements 451 
 
 " Watch Glasses 547 
 
 " Water Bath 548 
 
 Page 
 
 Porous Cups or Cells 172 
 
 Plates 419 
 
 Portable Microscope, B, & L. . . 311 
 
 " Zeiss 323 
 
 " Polygraphs 407 
 
 " Projection Apparatus. 441 
 
 Posts, Binding, Ostwald 394 
 
 Potash Bulbs," 436 
 
 Potash Bulb Support 436 
 
 Potentiometer, Fischer, for 
 
 Cathode Potentials 199 
 
 Potentiometer Indicator, Leeds 
 
 & Northrup 451 
 
 Potentiometer Method for 
 Electro-Motive Force Ap- 
 paratus 395 
 
 Potomcter 417 
 
 Pouring Moulds 364 
 
 Prat-Dumas Filter Paper 216 
 
 Precipitating Jars 282 
 
 Precision Burettes 89 
 
 " Flasks, Volumetric. . 225 
 
 " Hydrometers 271, 273 
 
 " Microtome, Minot 
 
 Automatic 344 
 
 " Mixing Cylinders .... 174 
 
 Pipettes 414 
 
 " Thermometers 531 
 
 " Urmometers 545 
 
 Preparation Dishes 180 
 
 Jars 276 to 281 
 
 Prescription Balances 56, 57, 59 
 
 Press, for Corks 155 
 
 " Filter 217 
 
 " Hydraulic 437 
 
 " Laboratory 438 
 
 " Pastille 389 
 
 " Plant 75 
 
 " Sodium 438 
 
 " Tincture 438 
 
 Pressing Paper, Botanical 75 
 
 Pressure Blowers 73 
 
 " Bottles 84 
 
 " Filter Apparatus 211 
 
 Gauges 258, 289 290 
 
 " Pumps 1 to 6 
 
 " Regulator, Gas, for 
 
 Junker Calorimeters. . 108 
 " Regulator, for Gas 
 
 Cylinders.. 252 
 " " Gas, for 
 
 Thermo- 
 regulators, 537 
 
 Tubing, Rubber 479 
 
 Prest-o-lite Gas Tank 441 
 
 Primary Batteries 65, 66 
 
 Prince Rupert Drops 480 
 
 Prism, Nicol, Model of 357 
 
 Prisms, Spectro 504 
 
 Probes 184 
 
 Projection Apparatus and Ac- 
 cessories 439 to 448 
 
 Projection, Drawing and Mi- 
 cro-Photographic Apparatus 
 
 Combined 339 
 
 Projection Microscopes 446 
 
 Protozoa, Parasitic, with their 
 
 Carriers, Charts of 131 
 
 Psychrometer, Sling 274 
 
 Pukal Filter Balloon 210 
 
 Pulfrich Refractometer 468 
 
 Pulleys on Support for Trans- 
 mission 515 
 
 Pulverizing, Crushing and 
 Grinding Apparatus, ...161 to 169 
 
 Page 
 
 Pump.^ AHd 1 
 
 Air ,,,,.,,1 to6 
 
 " Artificial Respiration. . 402 
 
 " Compression for Gases 151 
 
 Filter 217 
 
 " Pressure 1 to 6 
 
 " Suction 1 to 6 
 
 " " and [u-essure .., 218 
 
 " Vacuum 1 to 6 
 
 Purinometer Hall ,.,.., 543 
 
 Pycnometers 491 
 
 Pyrometers 449 to 458 
 
 Pyrometer Cones, Seger 458 
 
 " TLd>e3, Aliuidum . , , . 458 
 
 
 
 Quartz Apparatus, Transparent 4.59 
 
 " Lenses 504 
 
 " Mercury Vapor Lamp . . 503 
 
 " Pyrometer Tubes 450 
 
 " Substage Condensers . . . 320 
 " Test Plates for Polari- 
 scopes 435 
 
 ■' Thermometers 532 
 
 Quevenne Lactometers 348 
 
 R 
 
 Rabe Water Motors 362 
 
 Racks Filter 216 
 
 " for Staining Slides 507 
 
 " " Syringes 516 
 
 " " Test Tubes 523 
 
 Radial Burner, Fletcher 97 
 
 Radiation Pyrometers, Thwing. 457 
 
 Radio-active minerals 460 
 
 Radio-Chemistry Apparatus 
 
 460 to 464 
 
 Rake, Cupel 172 
 
 Rammelsberg Drying Oven.,. 374 
 Ramsay-Young Gas Compres- 
 sion Pump 151 
 
 Ranke Reaction Glass 543 
 
 "Raumwinkelmesser" 386 
 
 Ravanel Culture Dish Holder.. 171 
 
 " Innoculating Needles.. 364 
 
 Ray Filters for Spectroscopy. 503 
 
 Razors, Section 347 
 
 Razor Strops 348 
 
 Reaction Glass, Ranke 543 
 
 Plates 419 
 
 Reader for Burette Meniscus, 88 
 Reading Device for Thermom- 
 eters 533 
 
 Reading Glasses 288 
 
 " Glass for Balances . , . . 64 
 
 " Microscopes 296 
 
 " Microscope for Nemst 
 
 Balance 53 
 
 " Telescopes 296 
 
 Reagent Bottles 80 to S3 
 
 Reagents for Abderhalden's 
 
 Dialyzing Method 177 
 
 Receivers for Distillations in 
 
 Vacuum . . . , 465 
 
 '* for Pressure Blowers. 73 
 
 " " Retorts 465 
 
 Receiver and Cover for Sieves 486 
 Reckoner, Ackermann Auto- 
 matic 351 
 
 Record Syringes 517 
 
 Record-Bruneau Syringes 518 
 
 Recorder, Piston . 400 
 
 Recorders, Temperature, Leeds 
 & Northrup Patent 454 
 
Recorder and Reyulalor fur 
 Electric Pyrometers, Thwing. 237 
 
 Recording Barometer, 65 
 
 " Drum, 8herrington- 
 
 Sl;irliiiK 390 
 
 " 'J'lu'riiMjmt'ters b'Sl 
 
 Red Fibre Hlocks 34S 
 
 Reduction Tiiltrs 4G5 
 
 Reductor, Jones 465 
 
 Redwood VisruninieliT 370 
 
 Reed Extntrlion Ap|.ar;tt.us, . 207 
 Reflecting Stereoscope, Zeiss. . 326 
 
 Reform Hyringes 518 
 
 Refractometers :ind Accessories 
 
 465 to 473 
 Ri-fnu'torv Cement, Alunilum, . 7 
 VulcLai 
 
 Paste 110 
 
 Refrigerators 45 
 
 Register, Photographic, Dodge 409 
 Regnault Specific Gravity Bot- 
 tles 491 
 
 Regulatiu', Gas 256 
 
 " Pressure, for Gas 
 
 Cylinders 252 
 
 Toluol, Ostwald 393 
 
 " and Recorder for 
 
 Electric Furnaces, 
 
 Thvsinsi 237 
 
 Reichert Mekillngraphic Mi- 
 
 rrMsro],e 301 
 
 " 'I'heinio-regulators., 536 
 Reichert-Novy The rmo-regu la- 
 tor 536 
 
 Reichel Filter Apparatus 209 
 
 Reischauer Specific Gravity 
 
 Bottle 491 
 
 \VaterBath. ,,,, , 552 
 Reischauer-Brinton Specific 
 
 Ciniviiv \'.<-\i\.' .... 491 
 
 Reiss l^h:i<lM(n,(<i'r:d,lefi. . . 470 
 
 RelaU\r Plml, Hrls 385 
 
 Replica LiratiTigs for Spectros- 
 copy 504 
 
 Reservoir for Pressure Blowers 73 
 Resistances, Leeds and North- 
 rup, for Electrolytic W ork . . . 393 
 
 Resistances, Ruhstrat 203 
 
 Resistance Box, Leeds & Nor- 
 
 thrup 394 
 
 " Otto Wolff. ... 394 
 
 Bulbs 453 
 
 *' Thermometers, Plat- 
 
 in mn .... . . -J.vl 
 
 " Thermonietii- Pe- 
 
 corders, [,e<'ils i 
 Norl!ini|. . 454 
 
 Respiration A]ip;ii-:it ik^, ,l:n|net. 404 
 Piniip.<, .\ilitirial 402 
 
 V;dveH 403 
 
 Respirators 474 
 
 Respiroscope 417 
 
 Retorts 474 
 
 " Transparent (Quartz. . . 4.59 
 
 Retort Adapters 1 
 
 " for Creosote Oil Distil- 
 lation 19 
 
 Revolving Stages, Zeiss 320 
 
 Rheostats for Micro Arc Lamps 331 
 " " Projection Ap- 
 
 liaratus 44S 
 
 " Ruhsli;il 203 
 
 Rhombohedruri Mn.lel 3.5Si 
 
 Ribbon Carriers fur Micro- 
 tones 346 
 
 Richard Recording Barometer.. 65 
 
 " Thermograph 534 
 
 Richards Filter Pump 217 
 
 Riche A<liabatic Calorimeter 
 
 :i.]id Ac(;essories 104 
 
 Richmond Slide Rule 350 
 
 Rickards S|iutum Shakers 482 
 
 Riders, for Balances 64 
 
 Rieder Mixing Pipette 263 
 
 Riesenfeld Spectrum Burner. . . 502 
 " " Lamp. . . . 502 
 Riesenfeld and Wohlers Spec- 
 trum Burner 502 
 
 Rings, Concentric 475 
 
 " for Micro Slides 335 
 
 " Straw 512 
 
 " Suberite 513 
 
 " for Supports 475 
 
 Ring Burner 94 
 
 " Supports 514 
 
 Ringer Extraction Apparatus 206 
 Roasting Dishes, Battersea. ,. . 475 
 
 Robax Glass Tubing 260 
 
 Robervahl Balance 59 
 
 Rock Crystal Apparatus 459 
 
 Rocksalt Lenses 504 
 
 Rod, Charging, for Electro- 
 scopes 462 
 
 Class 260 
 
 Silifn 489 
 
 Stirring, of Class 260 
 
 Rohrig Fat Extraction Tube . . . 351 
 Rose Automatic Adjustable 
 
 Burette 88 
 
 Crucible 159 
 
 Rosenau Syringe Rack 51li 
 
 Rosenberger Innoculating 
 
 Needles 364 
 
 "Rotameter" 25l> 
 
 Rotarex, Dulin 17 
 
 Rotary Crucible Holder. . . , ir,l 
 
 " Microtome Minol .... :;44 
 Rotating Anode am I St iriing 
 
 Apparatus 199 
 
 Rothe Double Automatic Pi- 
 pette . 412 
 
 Roux Bacteriological Chart ; . . . 125 
 
 " Culture Flask L71 
 
 Tube 172 
 
 " Syringes 516 
 
 " Thei'mo-regulator, Bime- 
 tallic 536 
 
 Rowntree-Geraghty Colorim- 
 eter 144 
 
 R i; .\lunduin 149 
 
 linhberBamls 475 
 
 Bottles 84 
 
 Bulbs 475 
 
 " Bulbs for Dropping 
 
 Bottles 76 
 
 " Caps for Dropping Bot- 
 tles 76 
 
 Caps for Test Tubes ... 476 
 
 Dam 478 
 
 Disc!^ for i"uo( Blowers. 73 
 Extractiiu Apparatus.. 207 
 
 Finger (..'ols 476 
 
 Funnels 229 
 
 Gloves 476 
 
 " Policemen 476 
 
 Spatula 490 
 
 Stopcock 510 
 
 Stoppers 477 
 
 Testing Machine 527 
 
 Tissue 478 
 
 Rubber Tubing 478 
 
 " " .Stretcher 480 
 
 " Viscosimeter 480 
 
 Ruehtnann Uricometer 544 
 
 Ruhmkorflf Induction Coils 275 
 
 Ruhstrat Rheostats 203 
 
 Rules 290 
 
 Rule, Richmond, Slide 350 
 
 Slide 489 
 
 Rupert Drops 480 
 
 Rutherford Electroscopes 464 
 
 " Prism 494 
 
 s 
 
 Saecharimeters 430 
 
 Saccharo-manometer 544 
 
 Saccharometers 544 
 
 Safety Burners, Koch 98 
 
 " Tubes 232 
 
 Valve Jars 281 
 
 Sahli Haemometer 265 
 
 Salinometer 273 
 
 Sample Boxes 85 
 
 " Cans for Cement . 114 
 
 " Grinders, Braun 163 
 
 Samplers 480 
 
 Sampler. Cement 112 
 
 Sand, Hei'k.shire 552 
 
 S:ind iiiilh.-i 480 
 
 " Crunhles 157 
 
 " Classes 481 
 
 " Sieves 487 
 
 " TlieriiKiineters 534 
 
 Saiinnieler 88 
 
 Sapniiificntinn Burette 88 
 
 Flask, Volumet- 
 ric 224 
 
 Sargent Automatic Gas Cal- 
 orimeter 107 
 
 " Electric Drying Oven.. 376 
 
 " High Temperature 
 
 Burner 93 
 
 Sartorius Brain Microtome .... 345 
 " Freezing Microtome. . 345 
 
 Saucepans 75 
 
 Sauer Charts of Petrography... 133 
 Sauveur Metallurgical Micro- 
 scope 298 
 
 " Micro-Photographic 
 
 Apparatus 298 
 
 Saw, Bone 182 
 
 Saxe Areo-Pycnometer 273 
 
 " L'rino-Pycnometer 544 
 
 Saybolt Universal Viscosimeter. 371 
 
 Scale, Cement 113 
 
 " Percentage 113 
 
 Scale Tester, for Thermometers 292 
 
 Scalpels 182 
 
 "Schalchen" Hofmeister 481 
 
 Scheibler Calcimeters 99 
 
 " Desiccators 175 
 
 Scheibler-Finkener Calcimeter. 99 
 
 Schellbach Burettes 87 
 
 Su|i]iort 515 
 
 Schiff Xitrometer 367 
 
 Schiiling Sjiecifii' Oi'avity Ap- 
 paratus for (ias 256 
 
 Schimmel Mole<>ulnr Weight 
 Determination Apparatus 
 
 for Essential ( tils 373 
 
 Schleicher iV Sehull Filter 
 
 Paper 214 
 
 Schmidt Eleel nuueter 462 
 
Schmidt & Ilariiw'^li Pc)l;iri- 
 
 S(.^opcw 424 to 435 
 
 Schmidt & Hacnsch 8pe(^t^o- 
 
 scopes 492 to 494 
 
 Schonjahn Grain Germinator. . 262 
 
 Schopper Conditioning Ovens. , 52S 
 
 " Testing Apparatus 
 
 525 to 52S 
 
 Schroedter Alkalimeter T 
 
 Schultz CdiijiuUuiifttT 266 
 
 Schultze Micro Wnnn Slage.. 333 
 
 Schuize Stirriny; A|ipar:i(u^ 509 
 
 Schuman Speciiic Gravity Bot- 
 tle ■ 492 
 
 Schuster Dropping Bottle 77 
 
 Schutte Penetrometer 18 
 
 Schwartz Calcium Chloride 
 
 Tubes 100 
 
 Schwarzmann Charts of Crys- 
 tallography ' . . 133 
 
 Scimateo Patent Burner 93 
 
 Scissors 486 
 
 " Dissecting 1S3 
 
 Scleroscope 267 
 
 Scoops 4S1 
 
 " with Counterpoise ]so 
 
 Scorifiers, Battersea 481 
 
 Seorifier Tongs 539 
 
 Scott Glue Tester 261 
 
 " Viscosimeter 370 
 
 Screens, I'rniection 448 
 
 Screw ( 'ail .hirs 281 
 
 " t 'i>iiiiires,siii's for Rubber 
 
 Tubing 142 
 
 " Drivers 481 
 
 " Testing Microscope 294 
 
 Sealing Tubing, of Glass 258 
 
 W' ax 553 
 
 Seek Mills.. 164 
 
 Section Knives . 347 
 
 Lifters 184 
 
 " Razors 347 
 
 Sectioning Apparatus for Min- 
 erals, Wiilfing 3r)2 
 
 Sector I'hnromeler 408 
 
 Sedges irk-Haft-c ImihthO . .. .V.2 
 
 Sedimnil (daises 5211 
 
 Seekers 184 
 
 Seger Draft Gauge . . 290 
 
 " Pyrometer Cones 458 
 
 Selenium Cells 481 
 
 Separatory Fimnels 230 
 
 " Funnel for Creosote 19 
 
 " Tar )8 
 
 Scn.logival Apparatus 21 to 45 
 
 Pipettes 413 
 
 SvrinK''S 516 
 
 Test Tul)es 52J 
 
 " " Tube Supports 524 
 
 Water Bath 36 
 
 Serum Coagulators, Hearson. .32, 34 
 
 " Drying Apparatus 193 
 
 Sets of Dissecting Instruments 184 
 Set of Pure Resistances for Elec- 
 trolytic \V ork, Leeds & North- 
 
 rup 393 
 
 Sewage Test Cylinder 173 
 
 Shaking Apparatus 482 to 485 
 
 for Sieves., 487 
 " Device for Ostwald 
 
 Thermostats 392 
 
 Sharpener for Cork Borers 154 
 
 Shears 486 
 
 " Cartilage 184 
 
 Shelf for Pneumatic Troughs, , . 423 
 
 Sh.-ir, DigesiiTig, Kjeldah!. . .. 361 
 
 .Sli.'lls, DifTusioTi 176 
 
 Abderhalden.. 177 
 
 Shell YiaLs ,545 
 
 Sherrington-Starling Record- 
 ing Drum 399 
 
 Short A Mason Recording Thcr- 
 
 iiioiiieler 534 
 
 Sliiil, Lead 283 
 
 Shields, Aluminum, for Centri- 
 fuge Tubes 115 
 
 Shovel, Cupel 172 
 
 Shunts for Demonstration Gal- 
 vanometers 200 
 
 Shutter, Automatic, for Micro- 
 Photographic Apiiaratns . . . 338 
 Si(h> XrH-: Flasks. J2:i 
 
 Sidersky \"aruniii i h-m . MSIt 
 
 Siemens Water IVrniiieter. 1.55 
 
 Sieves 4N6 
 
 Sieve Bolting Cloth 75 
 
 " Shakers 487 
 
 Sight-Box, Photometer 3S4 
 
 Signal Markers 4111 
 
 Silberschmidt I'^iltei- Appara- 
 tus 2 1 n 
 
 Silica Casseroles, I in 
 
 " Combustion Boats 14',i 
 
 " " Tubes 149 
 
 " Crucibles 157, 159, 160 
 
 " Distilling Flask 222 
 
 " Evaporating Dishes 179 
 
 " Flask 219 
 
 " MufHes 364 
 
 " Plates 419 
 
 " Rod 489 
 
 " Spectrum Tubes 505 
 
 " Test Tubes 520 
 
 " Triangles 540 
 
 " Tubing 489 
 
 Silk PeDtoue 177 
 
 bles 
 
 iJislie 
 
 ISO 
 
 piex ( 
 
 ■ Ci 
 
 SkidmoreCruejl,!,. . . ir,() 
 
 Sl-iin Milk iJnIilr 3--,n 
 
 Slides, Culture :i34 
 
 Micro 334 
 
 Slide Boxes for Micro Slides . . . 335 
 
 " Box for Tar Testing, . . 18 
 
 " Cabinets 336 
 
 " Forceps 22N 
 
 " Labels. '■'>'■■'• 
 
 " Rules 1.^9 
 
 ■' Rule, Richmond 35(1 
 
 Slide Wu-p TJi-idirrs 39;; 
 
 Sliding Objective Changers, 
 
 Zeiss 321 
 
 Sling Psychrometer. 27 I 
 Slit ; Type Ult.ra-Micrnsrnpr, 
 
 Zeiss. . , . . '■>'-■' 
 
 SmalieyExtr.acliuii Tube. 205 
 
 Smith Duclilitv .\[;lrl,i,ie 16 
 
 " Fermeidal i<ni Tulie . 206 
 
 Soap, Palm Oil 34,S 
 
 Sodium Presses 438 
 
 Spoon 490 
 
 Soil Analysis Flasks 218 
 
 " B.alance 61 
 
 " P.orer 490 
 
 " Thermometer . 535 
 
 Solidimcter 273 
 
 Solution, Platinizing 394 
 
 Solution Scales 59, 60 
 
 I'age 
 Swmmer I Ivdi'oiiietei- for As- 
 phalt. . .." 17 
 
 Soundness Test Apparatus for 
 
 Cement 112 
 
 Soxhlet Condenser 153 
 
 Drying Oven 380 
 
 " Extraction Apparatus.. 206 
 
 Tube 205 
 
 Spark Coils 275 
 
 Spatulas 490 
 
 Platirmiii 422 
 
 Specific Gravit}' App.ii-atiis, 
 
 Johnson 114 
 
 Specific Gravity Apparatu.s for 
 
 Gas, Schilling 256 
 
 Specific Gravity Balances 58 
 
 " " Bottles 491 
 
 Bottle, Bar- 
 rett-Hubbard.. 18 
 " " Hydrometers.. 271 
 
 Specimens, Toiu'maline 353: 
 
 Specimen Bottles 77 
 
 " Forceps 22T 
 
 Jars 276 to 281 
 
 \ials 545 
 
 .-^j.eelral Objective for Micro- 
 scope 324 
 
 Specir.-d orular, Abbe 324 
 
 .-^pectro-i 'i)lniameter 145 
 
 Speotriipliiilumeter, Konig, with 
 
 Wanner Pyrometer 457 
 
 Spectroscopes, Spectrographs, 
 Spectrometers, Spectropho- 
 tometers and Accessories 492 to 506 
 Spectroscope, Direct Vision, 
 for use with Polariscopes. . 429 
 
 Spectrum Burners 502 
 
 Cells 504 
 
 " Lamps .502 
 
 " Photograph Measur- 
 ing Microscope 293 
 
 " Tubes 505 
 
 Speed Counter, for Electrol- 
 ysis 199 
 
 " Indicator, for Centri- 
 fuges 1 15 
 
 " Reducing Gear fur Mo- 
 tors 303 
 
 Spencer Filter Apparatus 160 
 
 Pipettes 413 
 
 Sphygmocardiograph, Jaquet . . 406 
 Spliygmograph, Lehmann. . . . 407 
 Sphygmotonograph, Uskoff , ,. 408 
 Sjiiral Hot Vv ater Heater for 
 
 Kefraetometers 469 
 
 Spintliariscnpc 460 
 
 Siiirunirler. .laquet 404 
 
 Spnngrs . 506 
 
 S|iuons 606 
 
 Deflagration 174 
 
 Sodium 490 
 
 Springs, Watch . 547 
 
 SpriuKli'ick fur Microlnuie 
 
 Ktiivcs . 3-i>: 
 
 -Maiinineler 400 
 
 Sinitum Bottles .506 
 
 Dishes 506 
 
 Shakers 482 
 
 Tray . ... ,506 
 
 Squibb Autoiiialir i:Niclir ,S7 
 
 Sei>aratnrv Fuinid . . . 231 
 
 Urinoi.ieler. 544 
 
 Stability Test Apparatus 508 
 
 Stages, Mechanical, B. & L 316 
 
 " Warm, for Microscopes. 333 
 
Rige 
 
 Stage MicronieterM, ]i. A. h 316 
 
 " " Zeiss 324 
 
 Staining Blocks 507 
 
 " Dishes 507 
 
 Jars 507 
 
 Rack 507 
 
 " Tray..., 507 
 
 Stalagraometer, Traubo 266 
 
 Stammer Colorimeter and Ac- 
 cessories 147 
 
 Stands, Wood, for Test Tubes. , 523 
 Stand for Zeiss Anastigmatic 
 
 Magnifiers 289 
 
 Standard Cell, Weston 396 
 
 Stands for Projection Appara- 
 tus 448 
 
 Steam Boiler 508 
 
 " Cenerator 508 
 
 " Pressure Sterilizers-Au- 
 toclaves 37, 38 
 
 " Sterilizers, Arnold 41 
 
 Steaming Apparatus for Ce- 
 ment 114 
 
 Steel Rule 290 
 
 " Tape Measure 291 
 
 Stender Dishes 180 
 
 Stereo Binoculars, Bausch & 
 
 Lomb-Zeiss 72 
 
 Stereopticons and Accessories 
 
 439 to 448 
 Stereoscope, Reflecting, Zeiss. . 326 
 Stereoscopic Camera, Driiner. . 326 
 
 Ocular, Abbe 324 
 
 Sterilizers, Arnold Steam 41 
 
 " Freas Electric 40 
 
 " Hcarson Electric... 40 
 
 " " Automatic 
 
 Electric 
 Steam. ... 41 
 
 Hot Air 39,40 
 
 " Steam Pressure-Au- 
 toclaves 37, 38 
 
 " for Syringes, Dis- 
 
 secting Instruments, 
 
 etc 36 
 
 Sterilizing Boxes for Pipettes. 415 
 
 Stew Pans 75 
 
 Stewart Counting Apparatus. . . 155 
 " Cover Glass Forceps. . . 228 
 
 " Lactokrit 116 
 
 Sticks, Meter 290 
 
 Still, Mercury, Hulett 297 
 
 " Tar Testing IS 
 
 " Water 186 to 189 
 
 Stirrers, Glass 260 
 
 " Glass, for Electrolysis, 
 
 Fischer 199 
 
 " Mechanical, for Molec- 
 ular Weight Deter- 
 mination Apparatus.. . 389 
 
 Stirring Apparatus 509 
 
 " Device, Luther 393 
 
 Rods, of Glass 260 
 
 Stoddart Clamps 142 
 
 Stohmann Volumetric Flasks . . 226 
 
 Stokes Pipettes 413 
 
 " Stills 186 
 
 Stone, Oil 182 
 
 Stoneware Jars 282 
 
 " Mortars 362 
 
 Stopclock 511 
 
 Stopcocks 510 
 
 Stopper, Carboy. 110 
 
 " Rubber 477 
 
 Stopwatches 511 
 
 Storage Batteries. 60 
 
 " Battery Hydrometers. . 273 
 
 " " Jars 68 
 
 Tanks 511 
 
 Stormer Viscosimeter 370 
 
 Stoves, Alcohol, Barthcl 98 
 
 Gas 97 
 
 Straub Tambour 401 
 
 Straus Lactic Acid Funnel 23! 
 
 Straw Rings 512 
 
 Streak Plates 419 
 
 Stretcher for Rubber Tubing. . 480 
 Strieker Micro Warm Stage .... 333 
 String Galvanometer, Eintho- 
 
 ven, Endelmann 409 
 
 String Galvanometer, Ein- 
 thoven, Cambridge Scientific 
 
 Inst. Co 410 
 
 Strops 348 
 
 Student Microtome, B. & L . . . . 343 
 
 Suberite Rings 512 
 
 Sub-Q Safety Syringe 516 
 
 Substage Condensers, B. & L.. . 315 
 " Zeiss .... 320 
 
 Suction Pumps 1 to 6, 217, 218 
 
 Sugar Dish, for Weighing 180 
 
 " " Platinum 421 
 
 " Flasks 226 
 
 " Hydrometers 273 
 
 " Polariscopes 430 
 
 " Refractometer 468 
 
 " Tables for Refractom- 
 
 eters 470 
 
 Thermometer 535 
 
 " Tube, Hortvet 542 
 
 " Weights 63 
 
 Sulphonation Test Funnel 231 
 
 Sulphur Apparatus 512 
 
 " Photometer, Parr 512 
 
 " Turbidimeter 542 
 
 Sulphur and Ammonia Deter- 
 mination Apparatus for Gas 
 
 Analysis . . 249 
 
 Sulphuric Acid Drying Tube, 
 
 Vanier 193 
 
 Sulphurous Acid Condenser. . . , 152 
 
 Supports, without Fittings 513 
 
 " Adjustable 515 
 
 " " for Physi- 
 
 ological 
 Work ... 401 
 f.dass, for Balance 
 
 Levelling Screws 64 
 
 Burette. 90 
 
 fur C'entrifuge Tubes 524 
 Condensers . . . 153 
 
 Cells 
 
 ..hi 
 
 ity 
 
 Dir 
 
 \'i 
 
 391 
 
 Spectroscopes . . 493 
 
 Electrolytic 198 
 
 with Heaters for 
 Extraction Appara- 
 tus 208 
 
 for Fermentation 
 Tubes.... 209 and 524 
 
 " Funnels 232 
 
 " Gas Cylinders ... 252 
 " Magnifiers, Ad- 
 justable 313 
 
 " Mercury Vapor 
 
 Lamp 502 
 
 " Nessler Tubes. .. . 144 
 " Pipettes 416 
 
 Page 
 Supports for Potash Bulbs .... 436 
 " " Reading Micro- 
 
 scopes or Read- 
 ing Telescopes.. 296 
 
 " with Rings 514 
 
 " for Spectrum Tubes.. 506 
 
 " Test Tubes 522 
 
 " Transmission, with 
 
 Pullevs 515 
 
 " for ^Veighing Bot- 
 tles 553 
 
 Support Level 284 
 
 " Rings 475 
 
 Tables 514 
 
 Swan Blood Lancet 267 
 
 SwiftBMill 165 
 
 Swimming Cups 515 
 
 Switches for Projection Ap- 
 paratus 448 
 
 Switch Board for Demonstra- 
 tion of Ohm's Law 195 
 
 Switch Boards for Experimen- 
 tal and Quantitative Electro- 
 lytic Analysis 195 to 198 
 
 Sy Extraction Apparatus 206 
 
 " " Flask 205 
 
 " Fumeless Digestion Appa- 
 ratus 366 
 
 Syphons 515 
 
 Syracuse Water Glasses 547 
 
 Syringes 516 to 519 
 
 Syringe Needles 518 
 
 Pipette, Woithc 414 
 
 T 
 
 T Tubes 541 
 
 Table, for Animal Operations . . 12 
 
 " " Embedding 348 
 
 " " Glass-Blowers 259 
 
 " " Projections Appa- 
 ratus 44S 
 
 " Support 512, 514 
 
 Table Microtome, B. & L 346 
 
 Table of International Atomic 
 
 Weights for 1913 555 
 
 " " Magnifications 322 
 
 " " Mendelejeff's Periodic 
 System of the Ele- 
 ments 555 
 
 " " Metric and English 
 
 Equivalents 556, 557 
 
 " " Size of Image on 
 Screen for Various 
 Projection Objectives. 447 
 " for Sugar Refractometer. 470 
 
 " Uhbelohde 373 
 
 Tabulae Anatoraicae 124 
 
 " Botanicae 129 
 
 Tallquist Haemaglobin Scale. . . 265 
 
 Tambours, Writing 401 
 
 Tanks, for Distilled Water 511 
 
 Tape, Adhesive 75 
 
 Tape Measures 291 
 
 Tar Testing Apparatus, Bar- 
 rett Mfg. Co 18 
 
 Tassin Metallographic Micro- 
 scope and Camera 300 
 
 Tatin Animal Holder 12 
 
 Teas Extraction Apparatus .... 206 
 
 Teclu Burner 93 
 
 Tele-Microscope 296 
 
 Telephone for Wheatstone 
 Bridge 393 
 
Telephone Receiver for Elei;- 
 trolytic Measurements, Leeds 
 
 & Northrup . , 
 
 Telescopes, Reading 
 
 Temperature Bulb for Folin 
 
 Apparatus 
 
 " Indicator, Leeds 
 
 <V Northrup 
 
 " Recorders, Leeds 
 
 & Northrup 
 
 " Regulator and Re- 
 
 corder for Electric 
 Furnaces, Thwing. 
 
 Tenaculum . 
 
 Terrapin Separator 
 
 Tessar Micro Objective . 
 Test Bottles, Milk 
 
 Te: 
 
 Plates for Polariscopes. . . . 
 
 Tubes 
 
 " Transparent Quartz 
 
 Tube Baskets 
 
 " Brushes . 
 
 " Caps, Rubber 
 
 " Clamps 
 
 " Cleaner 
 
 " Filling Attachment.. 
 " Holder for Ostwald 
 
 Thermostat 
 
 " Supports 
 
 ^ter, Air, Wolpert. , 
 
 ' Fire and Flash Point . . . 
 
 ' Cloth and Leather 
 
 Glue 
 
 ' Grain 
 
 ' Hardness 
 
 Linen 
 
 Testers for Paper, Rchopper . . . 
 
 '' \^ ater, Dionio 
 
 ' Yarn, iSchopper .... 
 Testing; Apparatus for Blood, . , 
 " " Cement . 
 
 " Glue,... 
 " Milk.... 
 
 " Oils 
 
 " " Papei, 
 
 Yarns, 
 Rubber, 
 Cloth, 
 etc., 
 Schop- 
 
 per 525 
 
 " Machines for Cement . . 112 
 
 "Oil 373 
 
 " Rubber.., 527 
 
 Sieves 486 
 
 Thayer Interval Timer 143 
 
 Theodolite Goniometer, Gold- 
 
 schmidt 352 
 
 Thermocouples for Brown Py- 
 rometers 450 
 
 Thermocouple Recorder, Leeds 
 
 & Northrup 455 
 
 " Potentiometer, 
 Leeds & North- 
 rup 45] 
 
 Thermoelectric Calorimeter, 
 
 Fery 106 
 
 Thermographs 534 
 
 Thermometers 530 to 534 
 
 " Beckmann 533 
 
 " Calorimeter 
 
 101 to 108 
 
 Thermometers, Calorimeter, 
 Platinum Resis- 
 tance 105 
 
 " for Creosote Oil 19 
 *' " Cryoscopes . 169 
 " " Incubators.. 535 
 " Low Tempera- 
 ture 533 
 
 " Maximum and 
 
 Minimum. ..... .535 
 
 " for Ostwald 
 Thermo- 
 stats 393 
 
 " Pitch Test- 
 ing 18 
 
 " Platinum Re- 
 sistance 453 
 
 " Precision 531 
 
 " of Quartz Glass 532 
 
 " Recording 534 
 
 " for Viscosime- 
 
 ters 373 
 
 Thermometer Clamps 143 
 
 " Conversion For- 
 mula 530 
 
 " Reading Device 533 
 
 Scale Tester 292 
 
 Tubing 260 
 
 Thermo-regulators 536 
 
 " Ostwald .... 393 
 
 Thermostats 392 
 
 (Incubators). 21 to 33 
 " for Low Temper- 
 atures 285 
 
 " (Thermo - regula- 
 tors) 536 
 
 Thickness Gauge for Paper 
 
 Testing 526 
 
 Thiel Melting Point Tube 297 
 
 Thimbles for Dialyzing 176 
 
 " " " Abder- 
 
 halden. 177 
 
 " Extraction 205 
 
 Thistle Tubes 232 
 
 Thoma Haemacytometer. .262 to 264 
 
 Mixing Pipette 263 
 
 Thoma-Metz Haemacytometer. 265 
 Thorn Extraction Apparatus. . 207 
 Thorner Illumination Tester.. 386 
 " Specific Gravity Bot- 
 tle 492 
 
 Thread Counters 288 
 
 " Galvanometer, Edel- 
 
 mann 409 
 
 " Galvanometer, Cam- 
 bridge Scientific Inst. 
 
 Co 410 
 
 Thurston Oil Testing Machine 373 
 
 Thury Chronograph 139 
 
 Thwing Temperature Regula- 
 tor and Recorder for 
 
 Electric Furnaces 237 
 
 " Total Radiation Py- 
 rometers 457 
 
 Tiles for Combustion Furnaces 236 
 
 " Earthenware 538 
 
 " Pill 412 
 
 Time Markers, Jaquet 400 
 
 Tin Boxes 85 
 
 " Foil Dishes 180 
 
 " Pipe 412 
 
 Tincture Press 438 
 
 Tinners Shears 480 
 
 Tintometer, Lovibond 148 
 
 Tips for Blowpipes 74 
 
 Tirrill Burner 92 
 
 " Gas Generator 253 
 
 Tissue, Rubber 478 
 
 Titration Outfit 90 
 
 Titre Test Thermometer 535 
 
 Toluol Regulators, Ostwald 393 
 
 " Thermometers for Low 
 
 Temperature 533 
 
 Tongs, Abderhalden 177 
 
 Cork 155 
 
 Crucible 538 
 
 Cupel 539 
 
 Gas 423 
 
 Scorifier 539 
 
 " Tourmaline 353 
 
 Torry & Eaton Cupels 172 
 
 Torsion Balances 60 
 
 " " for Cloth 
 
 Testing. 529 
 " " "Cream 
 
 Test ... 351 
 " Doolittle Viscosimeter 371 
 
 Tourmaline Specimens 353 
 
 Tongs 353 
 
 Towers, Calcium Chloride 99 
 
 Trachia Canulae 402 
 
 Tralle Hydrometers 273 
 
 Transfer Pipettes 413 
 
 Transmission Support with 
 
 Pulleys 515 
 
 Transparent Quartz Apparatus 459 
 
 Transpiration Balance 418 
 
 Transpirograph 418 
 
 Traiibe Stalagmometer 266 
 
 Trays 538 
 
 " for Micro Slides 336 
 
 " " Staining 507 
 
 " " Sputum Analysis .... 506 
 
 Triangles 539 
 
 Platinum 422 
 
 Trichinoscope 540 
 
 Trip Balance 59 
 
 Triple Aplanatic Magnifiers .... 287 
 
 " Beam Balance 58 
 
 Tripods 541 
 
 " for Spiral Condenser. . 152 
 
 " " Zeiss Anastigmatic 
 
 Magnifiers 289 
 
 Tripod Magnifiers 287 
 
 Troughs, Mercury 297 
 
 " Pneumatic 423 
 
 Trowels for Cement Testing, , 114 
 
 Tuberculin Syringe. Luer 519 
 
 " " Record. . . . 517 
 Tubes, Abderhalden, for Dia- 
 lyzing 177 
 
 " Alundum 7 
 
 " Arsenic 14 
 
 " Barometer 65 
 
 " Boiling Point, for Molec- 
 ular Weight Determina- 
 tion Apparatus 389 
 
 " Bulb Connecting, for 
 Marshall Urea in Blood 
 
 Apparatus 266 
 
 " Calcium Chloride 99 
 
 " Capillary Electrometer 395 
 
 Centrifuge 115 to 123 
 
 " Combustion 149 
 
 " " Platinum. . 421 
 
 " Connecting for Gas 
 
 Burettes 251 
 
 " Connecting for Mar- 
 shall Urea in Blood Ap- 
 paratus 266 
 
Tubes, Culture 172, .520 
 
 Distilling 101 
 
 Drying 193 
 
 " Extraction 205 
 
 " Fat Extraction, Rohrig 351 
 
 " Fermentation 209 
 
 Filter 218 
 
 " Folin, for Marshall 
 
 Urea in Blood Apparatus 266 
 " Freezing, for Molecular 
 Weight Determination 
 
 Apparatus 389 
 
 " Fume Absorption, Folin 543 
 
 Funnel 232 
 
 Gas Collecting 251 
 
 " Filter,. _ 254 
 
 " " Measuring 253 
 
 " Hortvet 542 
 
 Melting Point 297 
 
 " Migration 396 
 
 " Palladium, for Gas An- 
 alysis 253 
 
 " Polariscope 434 
 
 " Polariscope, Abderhal- 
 
 den 428 
 
 " Porcelain, for Hcraeus 
 
 Elements 451 
 
 " Pyrometer 450, 45S 
 
 Reduction 465 
 
 Safety 232 
 
 " Spectrum 505 
 
 " Stalagmometer . 266 
 
 T, U and Y 541 
 
 Test 520 
 
 Thistio 232 
 
 " Viscosity 397 
 
 " Vivien 542 
 
 Tube Furnace, Freas 236 
 
 " " Heraeus 238 
 
 " " Hoskins 237 
 
 Tubeuf Plant Pathology Charts 129 
 
 Tubing, Block Tin 412 
 
 " Copper, for Burner 
 
 Connections 98 
 
 " Dialyzer 176 
 
 " Flexible Metallic 542 
 
 Glass 260 
 
 " for Sralm-- L'.'iS 
 
 Lead 112 
 
 Parrhrr.rnt 1';i|iit 17(; 
 
 l-tiiMiiT -ITS 
 
 Silira. . ^N'i 
 
 Cutter, Cdass^. 25.S 
 
 " Gauge 2.'"-'S 
 
 " " Micrometer. . . . 2il2 
 
 " Stretcher 4S0 
 
 Tumblers, Glass 542 
 
 Tuning Forks, Electro-mag- 
 netic .". 400 
 
 Turbidimeters 542 
 
 TiirkHacmacytometer.. . .262 tn 2(il 
 
 Turn-table, B.&L.. 317 
 
 Tutwiler Modification of Hem- 
 pel Gas Burette 251 
 
 " Sulphuretted Hydro- 
 
 gen and Ammonia 
 
 Apparatus 249 
 
 Twaddle Hydrometers 271 
 
 Tyree Litmus Pencil 382 
 
 u 
 
 lTTid>es 100, 541 
 
 UbbelohdeTableH 374 
 
 " "\'iseoSLmctcrs 373 
 
 Uhlenhuth Shaking Ajtparatus . . 484 
 Uhlenhuth-Weidanz Filter Ap- 
 paratus 210 
 
 Ultrafiltration Apparatus, Bech- 
 
 hold 212 
 
 Ultrafilter Discs 212 
 
 Ultra-Microscope, Zeiss Cardi- 
 
 oid Condenser Type 329 
 
 Ultra-Mirn.sr,,|,c, Zeiss Slit 
 
 Type . . 329 
 
 Ultfa-Viol.'i Micrn-Photograph- 
 
 icOutfit and Accessories, Zeiss 341 
 Ultra-Violet Spectrographs 
 
 497 to 500 
 
 Ultzmann Polariscope 424 
 
 Underwriters Laboratories Ex- 
 traction Apparatus 207 
 
 U. G. I. Gas Pipette 256 
 
 U. S. Bureau of Mines Flash 
 
 Point Tester 369 
 
 U. S. Geological Survey Tur- 
 bidimeter 542 
 
 Universal Baloi)f.ico}i 443 
 
 Centrifuge 121 
 
 GoTiliiineter, Hutch- 
 inson 354 
 
 " Spectroscope, Kriiss. 497 
 
 " Syringe, Record 519 
 
 " Viscosimeter, Saybolt 371 
 
 Urc Eudiometers 205 
 
 Urea in Blood Apparatus, Mar- 
 shall 266 
 
 Urea. Nitrogen :m'\ Vinnionia in 
 Urine, Folin Ai"i|"i:irLitus for, , . 543 
 
 Urea Apparalus, I'tilin 544 
 
 Ureometers .544 
 
 Uricometer, Ruhemann 544 
 
 Urine Analysis Apparatus 543 to 545 
 " " Polariscopes, , . , 424 
 
 " Glasses for Sediment 520 
 
 Urinometers 544 
 
 Urino-Pycnometer, Saxe 544 
 
 Uskoff Sphvgmotonograph 408 
 
 UvioKdiiss Tubing 260 
 
 " " Merrury ^'apor 
 
 Lan-ii>s," 502 
 
 V 
 
 Vacriji,' Ciillurc Balhs , , 34, V> 
 
 Varuuni lilond<'n|lectiiii;Tul"'^ 2i;7 
 
 DesirrjLU.r.^ . ., 175 
 
 l")i^lilling Ajipiiniti)^ 190 
 
 '■ Embedding Apparat uh , 43 
 
 Flasks, Dewar 224 
 
 " Gauge 258 
 
 " " McLeod's 5 
 
 Ovens 379 
 
 " Pumps 1 to 
 
 Specific Gravity Bottle 491 
 
 \"alve.s, Anaesthetizing 403 
 
 forCasCylinder.^^ 252 
 
 Respiration 403 
 
 Vanier Cond>ined Potash Bulb 
 
 and Drying Tube , 193 
 
 " Combustion Train and 
 
 Accessories 150 
 
 Drying Tubes 193 
 
 Sulpburii^ Acid Bulb. .,. 193 
 
 Zinc Tube 193 
 
 Van Slyke Apparatus for the 
 Gasometric Determination of 
 
 Aliphatic Amino Groups 367 
 
 Vapor Density Apparatus, Vic- 
 tor iMeyer 545 
 
 Page 
 
 Vasculum, Botanical 75 
 
 Vaughan Animal Holder 11 
 
 Veit Switch Board for Quantita- 
 tive Electrolytic Analysis 197 
 
 Vernier Calipers 291 
 
 Vertical Attachments for Pro- 
 jection Apparatus 446 
 
 Vertical Illuminator, B, & L, , , , 317 
 
 " " Zeiss 324 
 
 Veterinary Clinical Thermome- 
 ter ", 535 
 
 Vials 545 
 
 Vicat Needle Apparatus 113 
 
 Victor Meyer Funnels 228 
 
 " " A'apor Density 
 
 Apparatus 545 
 
 " AAaterBath 550 
 
 Vinegar Hydrometers 273 
 
 " Tester (Acetometer) . , , 1 
 
 Virchow Knife , 181 
 
 Viscosimeter, Asphalt 15 
 
 Blood, Hess 267 
 
 Oil 370 
 
 Rubber 480 
 
 Viscosity Flasks, Engler 373 
 
 Outfit, Ostwald 397 
 
 " Pipette, Alexander, , , 261 
 
 Dudley 370 
 
 " Thermometers 373 
 
 Tubes 397 
 
 Vise with Anvd 13 
 
 Vivien Tube 542 
 
 Voge AiiiuudHnM.T 11 
 
 Vogel Funnels 229 
 
 " SpL■(.■lr(■l:^rO]>e, Direct Vi- 
 sion 493 
 
 " Ureometers 545 
 
 Vollhardt Burette Float , , , 88 
 
 " Calcium Chloride 
 
 Tubes 100 
 
 Nitrogen Bulbs 366 
 
 Volt and Ampere-Mefers, Dem- 
 onstration 200 
 
 Voltmeters and Millivoltmeters 200 
 Volumenometer, Erdmenger- 
 
 Mann 114 
 
 Vohmietric Flasks , ,^ 224 
 
 " " Precision . . . 225 
 
 Pipettes 413 
 
 " Precision. , 414 
 Von Babo-Erlenmeyer Combus- 
 
 tinii Furnace 236 
 
 Von Lang Dichroscope 354 
 
 Von Schroder Chemical Tech- 
 nology Charts 130 
 
 Vrba CrystalModels 360 
 
 " Model of Nicol Prism 367 
 
 " Polarisation Model 358 
 
 Vulcan Paste.,.' 110 
 
 w 
 
 Walker Specific Oavity Bottle 491 
 
 Walter riur|],l<- Mulder 160 
 
 " I 'ii"i|i|niiu I 'unnel 231 
 
 Wanner ^ Iptical Pyrometers 456 
 
 Warm Stages for Microscopes. . . 333 
 
 \V arming Table 545 
 
 Wash Bottle Flasks 219 
 
 Washing Apparatus for Micro- 
 scopical Material, Bain 546 
 
 " Bottles 546 
 
 " Gas 250 
 
 Wasserman Baths 35 
 
Wasserman Rr;irtion Test 
 
 Tubes 5U>0 
 
 ." Safety Pipettes. . . 414 
 
 Waste Jars 282 
 
 " Pail 546 
 
 Watches, Stop 511 
 
 Watdi Classes 547 
 
 (.Uass Clamps 142 
 
 " Springs 547 
 
 Watchmaker's Glasses 287 
 
 Water Baths 548 to 552 
 
 " " Abderhalden 177 
 
 " Serological 36 
 
 " " for Vaccine Cul- 
 
 1 iires, Wasserman 
 
 Test, etc 34 
 
 " Bath and Incubator 
 Combined, for Wasser- 
 man Tost 35 
 
 " Decomposition Appara- 
 tus 283 
 
 " Examination Apparatus, 
 
 Whipple 552 
 
 " Heaters , 552 
 
 " Heater for Pefractom- 
 
 eters 469 
 
 " Interferometer 471 
 
 " Level Regulator 548 
 
 " Motors 362 
 
 " Pyrometer, Siemens 455 
 
 " Sample Bottles 84 
 
 " Sampling Apparatus, Es- 
 
 march 553 
 
 " Stills 186 
 
 " Tanks........ oil 
 
 " Tester, Dionic 653 
 
 Watering Flask 226 
 
 Wavelength Spectrometer 495 
 
 Wax, Sealing 553 
 
 " Ppncils 382 
 
 AVealhcrhead Crusher 161 
 
 Weber Pliotometers 383 
 
 " FJiotometer Bench 384 
 
 " "Raumwinkelmesser" . . 386 
 " Relative Photometer. .. . 385 
 
 Wedgewood Mortars 362 
 
 Weichardt Hygienic Pipette .... 414 
 
 Weidanz Test Tube Support 524 
 
 Weighing Bottles 553 
 
 Dishes 180 
 
 " Scoops 481 
 
 Weights, Assay Ton 63 
 
 " for Balances 62 
 
 " Fractional 64 
 
 " for Sugar Analysis 63 
 
 Weiss Glue Testing Apparatus. . 261 
 Wel.'shiich Micro Lamps 331 
 
 \^'est.on Ammeters, N'oltriieterti, 
 
 Voltaimnetery, etc 261 
 
 W'eston Standard Cell 396 
 
 Westphal Specific Gravity Bal- 
 ance 58 
 
 Weule Direct r'i]iT{>nt Arc Lamp 
 for \liern-|'lini.oy;raphic Ap- 
 
 paniliis 340 
 
 Whe:d.s(uiir SliUe Wire Bridges 393 
 Whipple ( >cular Micrometer 
 
 Di.sc 316 
 
 Water Examination 
 
 Apparatus ')'>2 
 
 WhitiLll Tatuni Museum Jars. . . . 277 
 White BacteriiL Grinding Ap- 
 
 pai-atus 16ii 
 
 Whitelie^id ('nmpress<,,- fnr Li- 
 quid Air, . . 285 
 
 Wiborgh Suljihur Apiiaratus 512 
 
 Wicking for Aleohol Lamps 283 
 
 Wiesnegg Drying Oven 374 
 
 " Muffle Furnaces 235 
 
 Wiley Extraction Apparatus .... 207 
 
 " Water Bath 549 
 
 Wiley-Richardson Extraction 
 
 Apparatus 207 
 
 Will-Varentrapp Nitrogen Bulbs 366 
 Williams Gas Analysis Appara- 
 tus ." 246 
 
 Wilson Floftrosenpr 463 
 
 Wiue '|-es1ei, 1 1 1 1 j .■, m ) ) 1 1 -S;,lleron 194 
 
 Wingen llluMiiiinmrlri'-, 386 
 
 Winkler < i:is I 'iillect lilt; Tube. . . 251 
 
 " Pipette 2.56 
 
 Potash Bulb 436 
 
 Winkler-Kyll Potash Bulb 436 
 
 Wire 554 
 
 Wire Basket for Autoclaves. ... 37 
 
 " " " Test Tubes 522 
 
 " Gauge. ... 258 
 
 " GauKe. Phitinum 422 
 
 ■■ l'hi1ini<l, fnr Iimndating 
 
 Xeedjrs .364 
 
 '■ Pbitiuuin 420 
 
 " Ti-iaimlcs. ... 539 
 
 Wislicenus .\toTn ( 'on figuration 
 
 Models. . 19 
 
 Witt Filtering Apparatus 209 
 
 " Laboratory Press 43S 
 
 Woithe Syringe Pipette 414 
 
 " Test Tube Supports 524 
 
 Wolf Object Holder 289 
 
 WolffResistance Box 304 
 
 Wolflfhuegel Counting Appara- 
 tus 155 
 
 Wollny Thermometer 466 
 
 Wolpert Air Tester 7 
 
 Wool, Glass 261 
 
 Page 
 Workshop Mici'o.scope, Tassin. 300 
 
 Woulff Bottles 84 
 
 Wratten & Wainwright Light 
 
 Filters for Micro-Photography 342 
 Wratten & Wainwright Photo- 
 
 grapjiic Phitrs 506 
 
 WratteTi A W^unwright Hay 
 
 Filters fur Spec I joscopy ", 503 
 
 Wright Bluud Capsules 267 
 
 " " Pipettes 267 
 
 Writing Diamond 176 
 
 Tambours 401 
 
 Wiilfing Axial-urigle Apparatus 3.53 
 " Mineral Sectioning Ap- 
 
 Iiar:i.tijs 352 
 
 Wurster Hygrometer 274 
 
 Y 
 
 Y Tubes . ,341 
 
 YarnT-si.r, Srh.ipper 526 
 
 Yellow I'.. ■!-i;iij lluues 348 
 
 Yocum lv\i ijirt.ini: ,\|-)paratus. . . 206 
 
 z 
 
 Zabriskie ( 'l;uii|i for Minot Pre- 
 cision Mi.Tnionie 344 
 
 Zappert Iiaeiii;irvlometer 262to 264 
 
 Zeiss Adju-iablrOrulars 264 
 
 " .\ii:isli!^ni;U.ir Magnifiers.. 288 
 " AiUiirnlliiiKil ion Spectro- 
 
 srnp.. 500 
 
 " BijMnijIai' .Aiii-roscope 325 
 
 Cum]iarisonSpectroseo]ie 501 
 
 " Crvstallograpbic Micro- 
 
 sc/ipe 330 
 
 " <";ralingSpertroscope 499 
 
 " ll:ieiii.ii\(<. meters 262 
 
 " lufi'llri'i.nirfers 471 
 
 " Meiisiiiiiig Microscope. . . . 295 
 " Micro-Photographic Ap- 
 paratus 340 
 
 " ilicroscopes and Accesso- 
 ries 318 
 
 " Micro Arc Lamp 331 
 
 " Refractometers 465 
 
 " Spectrograph 500 
 
 " TTltra-^lirrowcopes 329 
 
 " I'ltra-Violet Micro-Photo- 
 graphic '.hit fit . 341 
 
 Zinc Tube, Vanier 193 
 
 Zittel and Haushofer Paleonto- 
 logical Charts . 132 
 
 Zittel-Pompeckj-Salfeld Pale- 
 ontological Charts 133 
 
 Zoological Charts, Leuckart- 
 Chun, 134 
 
 Zuntz Kymograjjlis .. 399 
 
CCIiE WaMttl? SrcSs 
 
REAGENTS 
 
 FOK 
 
 ANALYSIS, BACTERIOLOGY, 
 MICROSCOPY, ETC. 
 
 BAKER ANALYZED MERCK BLUE LABEL 
 
 KAHLBAUM CERTIFIED FOR ANALYSIS 
 
 Part II— Reagents 
 
 COPYRIGHT, 19U 
 BY ARTHUR H. THOMAS COMPANY 
 
 EDITION SEPTEMBER 1914 
 
 ARTHUR H. THOMAS COMPANY 
 
 WEST WASHINGTON SQUAKE 
 
 (!i.'10~2--t SOUTH 7tli ST.) 
 
 PHILADELPHIA 
 
 U. S. A. 
 
Our experience has shown us that no chemist wishes to confine his purchases 
 of high grade reagents for analytical purposes to those produced by any one 
 manufacturer. 
 
 The advantage of placing orders with a dealer offering the three most reliable 
 lines of analyzed and tested reagents is, therefore, obvious in that ihe products of 
 various manufacturers can be purchased at one time, on one order and received 
 in one shipment. 
 
 Where competitive bids on high grade reagents are required the customer 
 will please specify the maker whose goods are preferred, using such malter's 
 nomenclature as to purity, size of package, etc. 
 
 It is impossible to make intelligent competitive bids upon specifications 
 such as "Kahlbaum, Merck or Baker" "all chemicals to be c.p," "all chemicals 
 to be of highest grade" "Kahlbaum c.p." "Merck c.p," as no two bidders will 
 quote on the products of the same maker for each of the items in the list and also 
 because both Merck and Kahlbaum omit entirely the use of the designation c.p. 
 
 We believe that the responsibility as to the choice of maker belongs to the 
 buyer rather than to the dealer and that such responsibility should be assumed 
 by the buyer when preparing lists for competitive bids. This does not apply, 
 however, in quoting upon goods of ordinary grade carried in stock in bulk and 
 packed in quantities as desired. 
 
PREFACE 
 
 In this pi-ice list we offer in original factory packages three leading makes of tested reagents, i. e., BAKER 
 ANALYZED, MERCK BLUE LABEL and KAHLBAUM'S CERTIFIED FOR ANALYSIS, and, in addition, 
 leaa expensive chemicals carefully selected to meet less exacting requirements. These are secured from reliable 
 factories in both Europe and America, and in most cases, arc distinctly superior to the ordinary so-called 
 "commercial" grade. 
 
 The chemicals herein listed are those which have been most frequently ordered from our stock in the past 
 fourteen years as shown by carefully kept records during this period. We have not attempted to include all 
 the chemicals which may be required in modern laboratory work, particularly in the line of organic preparations 
 which our experience has shown to be demanded mostly by buyers entitled to duty free importation for edu- 
 cational use, and which we furnish in most cases by direct importation from Europe upon orders made out from 
 manufacturer's price list. Chemicals not in stock are secured promptly and economically from specified or best 
 available makers. 
 
 Stains and reagents required in Bacteriology, Microscopy and other of the Biological Sciences have been 
 given special attention and our list is offered as being unusually complete in this direction. 
 
 DUTY FREE IMPORTATION. Buyers entitled by law to duty free importation are encouraged to secure from 
 us the original catalogues of the European makers such as Kahlbaum, Marquart, Schuchardt, DeHaen, 
 etc. Duty free quotations on products of the European factory of E. Merck must be mad-B specially 
 as this firm does not permit the distribution of their German catalogue in the United States. Our 
 facilities for prompt and economical duty free importations are the result of years of effort and insure 
 the buyer lower cost and less trouble than when orders are placed directly with the European manufac- 
 turers. Parallel, competitive bids for duty free importation cannot be accurately made unless the 
 buyer specifies the exact grade of chemical desired in terms of the maker's price list. 
 
 CONTAINERS. Containers are charged for extra at price indicated in marginal column except where desig- 
 nation "inch" is given, in which case the container cost is included in the cost of the chemical. Our 
 designations for containers in the marginal column arc as follows: — 
 
 cb. Cork stoppered bottle. en. Tin can. 
 gb. Glass stoppered bottle. bx. Box. 
 rb. Rubber stoppered bottle. jg. Jug. 
 
 cc. Cylindrical carton. 
 
 We emphasize the convenience of our cylindrical, paraffined card-board cartons in which many of our 
 ordinary chemicals are furnished. They are much superior to the paper bag in common use and pro- 
 vide a suitable container until contents are used. We allow credit, if returned to us charges paid in 
 clean condition, for five pint and one pound acid bottles and carboys, when original purchase has been 
 made from us and containers bear our label. Other glass stoppered bottles, and cork stoppered bottles 
 are not returnable for credit. Arrangements are made with those regularly buying Baker's acids and 
 ammonia of us for the direct shipment of containers to the factory at Phillipsburg, N. J. 
 
 SHIPMENT RESTRICTIONS. Under United States laws and regulations established by the Interstate 
 Commerce Commission, certain chemicals are prohibited from express shipment and must in all cases 
 be shipped by freight. These are indicated by an asterisk thus (*). Chemicals designated thus 
 C) are accepted by express companies under definite restrictions as to quantity, size of package, 
 method of packing, etc. As all of these restrictions are without our control we accept all orders and 
 make all contracts subject to them and charge extra for all extra packing expenses as required by the 
 above mentioned regulations. 
 
 TERMS AND PRICES. All prices are subject to change without notice. With the exception of Baker's Ana- 
 lyzed Chemicals on which we extend special net prices considerably less than the printed list, the 
 prices in this catalogue may be generally taken as net. It has been found impracticable to quote a 
 uniform discount rate because of price fluctuations. Special prices will be extended on large quan- 
 tities of single items or on large general lists. 
 
 We are not manufacturers of chemicals but are dealers and importers. Our function is to afford scientists 
 an economical and convenient source of supply for the chemicals they most frequently require, no matter where 
 or by whom they are manufactured, and, in the case of the purest grades of chemicals to deliver in the manufac- 
 turer's original packages so that full responsibility as to quality rests definitely upon the manufacturer, where 
 it belongs. Chemicals are freely added to our price list and carried in stock when demand develops or our atten- 
 tion is called to future need. 
 
ARTHUR H. THOMAS COMPANY 
 
 BAKER, MERCK AND KAHLBAUM 
 
 ANALYZED, STANDARDIZED AND CERTIFIED 
 
 REAGENTS FOR ANALYSIS 
 
 BAKER BOTTLE 
 
 MERCK BOTTLE 
 
 KAHLBAUM BOTTLE 
 
 BAKER ANALYZED CHEMICALS— In making the analysis samples are taken 50 or 100 lbs. of material and 
 tests are made for all probable impurities. Each lot is numbered and every package filled from the 
 lot bears the lot number so that the contents of any package can be identified and traced back through 
 the entire process of manufacture. When impurities are found and can be determined quantitatively ■ 
 the amount is stated in percentages. The minus sign (— ) means that the amount of impurity is less 
 than is indicated by the figures, the term "None" that no appreciable amount of the impurity tested 
 for has been found in the sample. The term "Trace" indicates the presence of a minute amount of 
 impurity only detectable by qualitative methods. The analyses given throughout the catalogue are 
 intended as typical and goods furnished are not guaranteed to be exactly in accordance with these 
 analyses. 
 
 MERCK BLUE LABEL REAGENTS — -These reagents are standardized as well as analyzed as each reagent must 
 conform to the standard of purity given in Krauch's "Chemical Reag^nla, Their Purity and Tests" 
 before packing under the Blue Label. The standard of purity given on the printed label and under 
 each item throughout this catalogue is, therefore, absolutely guaranteed. A reagent under Merck's 
 Blue Label is, therefore, standard at all times so long as it is delivered in the original package. The 
 distinctive Blue Label is used on these tested and standardized reagents in contradistinction 
 to the White Label as used on Merck photographic, medical and technical chemicals. To avoid con- 
 fusion and mistakes customers will kindly use the term "Merck Blue Label" or "M.B.'L." in ordering , 
 these goods. 
 
 KAHLBAUM CERTIFIED FOR ANALYSIS REAGENTS—These reagents are high in price but embody a degree 
 of purity offered by no other maker as will be seen by comparison of the analyses printed under each 
 substance. The method of analys s, i.e. amount of impurity present in a definite weighable quantity, 
 has commended itself to those interested in using reagents of highest possible purity. These reagents 
 are listed in the Kahlbaum German price-list as "zur Analyze, mit Garantieschein" and are more 
 expensive than those listed under the designation "zur Analyse." A quantity of 10 grams is used 
 for each analysis and the statements on the labels are based on the following explanation:— 
 
 spur (Irace) 
 
 Kaum Spur (slight ti 
 
 Hauch(fainl tracej 
 
 = less Ihan /„ miliiirotnl 
 
 The bottles arc all sealed with lead in the Kahlbaum factory and in addition to the statement 
 on each label a printed guarantee is furnished with each package. There may be a slight variation 
 in the amount of impurity shown by the analysis on packages sent out from different lots but this ' 
 variafon is always exceedingly slight. We keep on hand for free distribution a supply of Kahlbaum's 
 latest price list for the use of customers placing import orders, particularly those for Educational 
 Institutions, which may be imported free of duty. 
 
SECTION I 
 CHEMICALS 
 
 ACETAMTDE 
 
 "ACETONE. te<-hiiie>al 
 
 "ACETONE, c. p Baker Anaivzc<l 
 
 Hp. gr ,790i 
 
 B. P 55.5°-57.5°( Typical 
 
 Nonvolatile matter 902% ( AnalyBis 
 
 Aldehyde none( 
 
 "ACETONE Merck Blue Lyibol 
 
 Tested for solubility in water. 
 
 a evaporation, leas than 0.0 
 
 Ounce and pound pi 
 
 .40 eb .06 5.00 gb .12 
 
 30 ob .09 I gal. 1.50 en .25 
 
 70 cb ,08 M lb. .20 incl 
 
 li lb .25 
 
 AldeKydes 
 
 Substances oxidizable 
 
 by Perm an ga 
 
 Analysis 
 
 WsitiT lesw than 3% 
 
 'ACETYL Chloride, c. p Baker Analyzt^d 
 
 °ACID, Acetic, coml., 28% 
 
 ° " Acetic, pure, 30% Baker Analyzed 
 
 " " Acetic, pure, 50% Baker Analyzed 
 
 " " Acetic, pure, 80% Baker Analyzed 
 
 ° " Acetic, pure, 99.0-69.5% Baker Analyzed 
 
 ° " Acetic, c. p., 30% Baker Analyzed 
 
 ° " Acetic, e. p., 50% Baker Analyzed 
 
 ° " Acetic, c. p., 80% Baker Analyzed 
 
 " " Acetic, c. p., 99.0-99.5% Baker Analyzed 
 
 Sp.gr.... 
 
 .0001% f 
 -.0001% > 
 
 Typical 
 Analysis 
 
 °ACID, Acetic, c. p., special, 99.7-99.9%. . . 
 
 Etiipyreumii (Bichromate test one-half hour) . 
 
 ° " Acetic, c. p., for shellac analysis... 
 
 Empyr. 
 
 a the 9B>2'; 
 
 "ACID, Acetic dduted 30% 
 
 Tile itn« impurities 
 
 " " Acetic, J6% 
 
 Tht ime impuntiea as the 99.'-^% 
 
 ° " Acetic 90% 
 
 The ti ne impurities as the 99H% 
 
 " " Acetic, 96% 
 
 The same impuntiea as the 99M% 
 
 ° " Acetic q<»3^% 
 
 Nonvolatile matt r less than 0.00048'?; 
 
 Hydrochlon, \cid 0.0003% as CI 
 
 Sulphunt ^rid le« thin 00001% as SO: 
 
 Iron ' if 3 than ODOKJ 
 Earths iess than 0.003% as fa 
 Formic Acid le"" than 0.i% 
 Sulphurous And less than 0.4% as SO- 
 Subataacps reducing Permanganate and oilier 
 empjreumadc bodies none 
 
 "ACID. Acetic 9S- 100% (conforming to the 
 Dkhroriixte test) 
 
 Substances reducing Dichrjinate solution in 
 one-half hour none 
 
 ° " Acetic Anhydride, c. p 
 
 -■ ivolatile matter 001% 
 
 .Merck Blue LLdjel 
 
 CI.. 
 
 Baker Analyzed 
 ( Typical 
 I Analysis 
 
 Merck Blue Label 
 
 I Guaranteed 
 
 "ACID, Acetic Anhydride 
 
 Hydrochloric Acid., ..less than 0.002% as ( 
 
 Nonvolatile matter less than 005'. _ 
 
 ACID, Arsenic, c. p Baker Analyzed 
 
 " Arsenious, coml., powder ■ 
 
 " Arsenious, c. p., powder Baker Analyzed 
 
 Nonvolatile matter 035%"i 
 
 Fe 005% I Typical 
 
 CaO none (Analysis 
 
 ACID, Arsenious, lumps' or powder Merck Blue Label 
 
 Nonvolatile matter leas than 0.05%-l 
 
 Barium Sulphate. Talcum, Caicmm &ul- 1 Guaranteed 
 
 phate etc "one I Analysis 
 
 Arsenic Sulphide less than 0.0005% a.s S^ un f , - 
 
 ACID, Arsenious, glassy Kah baum ^ C..f . A.^ 
 
 " Arsenious, glassy , Kahlbaum ■<...!. A. 
 
 Nonvolatile matter nonei ,„ J ^ .-r j 
 
 Arsenic Sulphide none! in 10 I Ceft Red 
 
 Solubility in Ammonia clear/ grams ( Analysis 
 
 Baker Analyzed 
 
 Baker Analyzed 
 [ Typical 
 ' Analysis 
 
 Merck Blue Label 
 Merck Blue Label 
 Merck Blue Label 
 Merck Blue Label 
 Merck Blue Label 
 
 .10 cb 
 
 .09 
 
 5 1b. 
 
 .45 cb 
 
 ?.n 
 
 .11 gb 
 
 .15 
 
 5 1b. 
 
 .50 gb 
 
 .25 
 
 .15 gb 
 
 .1.1 
 
 5 1b. 
 
 .70 gb 
 
 25 
 
 .18 gb 
 
 .15 
 
 5 1b. 
 
 .85 gb 
 
 .25 
 
 .20 gb 
 
 .15 
 
 5 1b. 
 
 .95 gb 
 
 .25 
 
 .20 gb 
 
 .15 
 
 5 1b. 
 
 .95 gb 
 
 .25 
 
 .20 gb 
 
 .15 
 
 5 1b. 
 
 .95 gb 
 
 .25 
 
 .25 gb 
 
 .15 
 
 51b. 
 
 1.20 gb 
 
 25 
 
 .30 gb 
 
 .16 
 
 5 1b. 
 
 1.45 gb 
 
 25 
 
 50 
 
 gb 
 
 .15 
 
 
 50 
 
 
 ncl 
 
 
 
 
 ncl 
 ncl 
 
 
 80 
 
 <i lb. 
 
 SO 
 
 
 ncl 
 
 ; 4 Ib- 
 
 80 
 
 
 ncl 
 
 1 ,- lb. 
 
 1.50 incl 'i lb- .50 incl 
 
 .15 incl 1..50 gb .13 H lb. ."15 incl 
 
 .30 incl 3 2 lb. 1.30 incl 
 
 60 cb .05 ii lb. . 7 incl 
 
 20 cc .04 
 
 .10 incl .35 cb .06 'i lb. .15 incl 
 
 40 incl li lb. .20 ini'i 
 
 too grm .50 incl 
 500 grm. .8.5 incl 
 
, Arsenious, powdered 
 
 Arsenious, powdered 
 
 Nonvolatile matter trace 1 
 
 Arsenic .Sulphide none J- 
 
 Content fi0,09%\ 
 
 , Benzoic (from Toluene) 
 
 Benzoic (from Toluene) 
 
 Boric, crystals 
 
 Boric, powdered 
 
 Boric, c, p., crystals 
 
 Boric, c. p., powder 
 
 Fe 
 
 Kahlbaum "C.f.A.' 
 Kahlbaum "C.f.A.' 
 
 Baker Analyzed 
 
 Baker Analyzed 
 Baker Analyzed 
 
 pcf uz. 
 
 ' inci 
 
 '""■ ""'■ 
 
 sizerkg. 
 
 100 grm. 
 500 grm. 
 
 ■ ■ M lb. 
 
 ■ ■ 'ii it.: 
 
 Klb. 
 
 per pkg. 
 
 ..50 
 
 .85 
 
 
 
 .43 CO .05 
 ..55 cb .12 
 .15 cc .05 
 .15 cc .05 
 .25 cb .09 
 .30 cb .09 
 
 incl 
 
 .10 
 
 .15 
 
 incl 
 
 
 
 
 
 .10 
 .10 
 
 incl 
 incl 
 
 .15 
 .15 
 
 incl 
 incl 
 
 n , 
 
 so J. 
 
 -■001%\ 
 
 , Boric, c. p., fused, anhyd., powd. . . 
 
 Boric, fused 
 
 Boric, fused 
 
 Alkalies unweiRhabJe I j 
 
 Silica unweighahlef ;,, in I 
 
 Earths,etc unweighable ■ "''" - 
 
 Content 99.10%l ^^""^ \ 
 
 Hygroscopic moistvire. remainder) ' 
 
 , Boric Anhydride 
 
 SiUca, Alkalies, etc leaa than 0.01% 
 
 Butyric, c. p., 100% 
 
 Carbolic, pure, white crystals 
 
 Carbolic, c. p. , loose crystals 
 
 Carbolic, c. p., loose crystals 
 
 Nonvolatile matter 001%1 
 
 M. P SS'-SS-C \ 
 
 B.P \%2-C( 
 
 Soluble in 15 parts ot water , ,' 
 
 , Carbolic, by synthesis, fused 
 
 Carbolic, crude, % 100. As recom- 
 mended by Drs. Mall and 
 Keiller for the preserva- 
 tion of cadavers. In bbls. 
 of 50 gala, at 65^. per gal. 
 
 , Carminic 
 
 Carminic 
 
 Carminic 
 
 TPHted for solubility and senijitlveness 
 
 Chromic, coml 
 
 Chromic, pure 
 
 Chromic, e. p 
 
 SOs 004% -I 
 
 HNCj trace I 
 
 Tf trace ' 
 
 Kahlbaum "C.f.A.' 
 Kahlbaum "C.f.A." 
 
 Merck Blue Label .25 incl 
 
 Baker Analyzed 
 
 ncl 1.50 cb .08 
 
 . . . .25 cb .09 
 
 ... .50 gb .15 
 
 ... .60 cb .09 
 
 50 grm. .70 incl 
 200 grm. l.SO incl 
 
 Hlb. 1.35 incl 
 }-i lb. .50 incl 
 
 A. H. T. Co. «100 
 
 Merck Blue Label 
 Merck Blue Label 
 
 Baker Analyzed 
 
 35 gb .15 
 
 .50 gb .15 
 
 incl 1.50 gb .15 
 
 , Chromic, free from HeSOi 
 
 Sulphuric Acid le.^a than 0.005% a 
 
 Potassium Sulphate and Chromate. . . . 
 
 * 
 
 Merck Blue Label 
 
 ' Guaranleed 
 
 Baker Analyzed 
 Baker Analyzed 
 
 ACID 
 ACID, 
 
 , Chromic for Carbon determination Merck Blue Label 
 
 T'-iteJ Inr Carbon 
 
 Cinnamic, c p 
 
 Citric crystals, or powder 
 Citric, c p , crystals 
 Citric c p powd 
 
 Nonvolatile matter 
 
 SO, 
 
 CaO 
 
 Pb 
 
 Fe 
 
 Oxilic Acid 
 
 Tartaric 4cid 
 
 , Citric 
 
 Uxalic 4cid 
 TarUinc Atid 
 Sugar lost 
 
 Sulphuric Acid 
 
 Calcium 
 Noninlatile matter 
 
 Dichloracetic 
 Formic, pure, &5'> 
 Formic, c p 
 Gallic, U b P 
 
 1.25 
 
 incl 
 
 .35 incl 
 
 75 cc .05 
 
 .15 incl 1.00 cb .08 
 .15 incl 1.10 cb .08 
 
 Merck Blue Label 
 
 less than \% I 
 
 than 05% Saccharoae \ , 
 
 leas than O00'>% as sOs , ' 
 
 lesa thin 01)01%! ' 
 
 leas than OoK, I 
 
 lesa than m'" J 
 
 1.40 gb .07 
 
 75 gb .1.5 
 
 .22 incl 1.25 gb .15 
 .10 incl .70 cb .10 
 
 .80 gb .15 H lb. .30 incl 
 
 bbl. 32.50 incl 
 
 15 grs. .40 incl 
 
 15 grs. .70 incl 
 
 H oz. 2.00 incl 
 
 }i lb. .55 incl 
 
 li lb. 1.00 incl 
 1'4 lb. .40 incl 
 
 34 lb. .40 incl 
 H lb. .40 incl 
 
 H lb. .40 incl 
 
 ?,i lb, .40 
 
T H U R 
 
 P A N Y 
 
 , Gallic Merck Blue Label 
 
 Tested for solubilitv in waters 
 
 Water contpnt. not uioro th:ui 10% I Guaranteed 
 
 Sulphuric Acid leas tUan O.OOS','",, aa SOi( Analysis 
 
 Inorganic matter less thai 
 
 , Hydriodic, c. p., sp. gi'. 1.50,, 
 Hydriodic, sp. gr. 1.60 
 
 Nonvolatile matter leas than 0.01% 
 
 p- 
 
 .1 0.05% 
 
 Merck Blue Label 
 
 Sulphuric Acid leaathan 0.01% ai 
 
 Heavy metals 
 
 Earths leas than 0.005% i 
 
 Hydrochloric Acid and 
 
 H>-drobrom.ic Acid . . less than 0.002% as i.ji 
 
 , Hydriodic, sp. gr. 1.70 
 
 Same impuntiea aa sp. gr. 1.50 
 
 Hydrobromic, sp. gr, 1,31 
 
 Hydrobrotnic, sp. gr. 1.38 
 
 Nonvolatile matter ... .not more than 0.01%, N 
 
 Arsenic less than 0.0015% , 
 
 Sulphuric Acid less than 0,0075% as SO. 
 
 Heavy metals none 
 
 Iron leas than 0.00015% 
 
 Hydrochloric Acid less than 0.06% 
 
 Hydriodic Acid less than 0.0156% 
 
 Phosphorous and Phosphoric I 
 
 Acids 0,0075% P!06 
 
 Calcium less than 0,005%, 
 
 , Hydrochloric, coml., pale, in 6 lb. 
 bottle _ 
 
 Hydrochloric, coml., pale, in case 
 of 10 glass stoppered 
 bottles 
 
 Hydrochloric, coml., pale, in carboy 
 
 Hydrochloric, c. p., sp. gr. 1.18-1.19 
 
 Hydrochloric 
 
 Merck Blue Label 
 
 Merck Blue Label 
 
 1.00 
 
 .25 
 
 1.35 gb .15 
 
 Hydrochloric, 
 
 Hvdrochionc 
 
 gWsi 
 ties 
 
 , in 6 lb. bottle. 
 , in case of 10 
 ; stoppered bot- 
 
 , m carboj 
 
 Baker Analyzed 
 Baker Analyzed 
 
 'J ^ 
 
 1 ib-l lt\ 
 J5 5-37 6% t 
 -0 0001%! 
 noneV 1 
 
 Baker Analyzed 
 Baker Analyzed 
 
 Nonvolatile matter 
 Hydrochloric c p 
 
 (Fr<e from Arsenic ind Antimoc\) 
 
 Hydrochloric, sp gr 1190 
 
 Sulphuric Acid less than 00012. "" - - 
 Nonvolatile matti,r 
 Free Chlonne 
 Sulphuroui A,oii 
 Hea\y metaU 
 
 Calcium 
 
 ^ Typical 
 0001% / Analysis 
 
 0005<" ' 
 
 Baker Special 
 
 .14 gb .15 
 
 .073^ 
 
 Merck Blue Label -10 
 
 than 000a% J 
 less than 00016%/ 
 thin 005% as faOi Guaranteed 
 
 less than 0001% i 
 
 less than 001% 1 
 
 more than 00001% / 
 
 "ACID Hydrochloric, sp gr 1 050 
 
 Merck Blue Label 
 
 Hydrochloric, f 
 
 The same impurities as ap. gT- 1 
 
 , Hydrofluoric, tech., 48% . 
 Hydrofluoric, tech., 48%. 
 Hydrofluoric, pure 
 Hydrofluoric, c p 
 Hydrofluoric, c p 
 
 Baker Analyzed 
 Baker Analyzed 
 
 ■ice in oilier siie package!, 
 ie pkg. per pkg. conl. 
 
 J4 lb. .40 incl 
 
 }4o-i. .25 incl 
 
 }4. oz. .35 incl 
 
 14 lb. .50 incl 
 14 lb. .60 incl 
 
 6 IbB. .30 gb .25 
 
 60 lb. 2.40 3.30 
 118 lb. 3.54 2.00. 
 
 6 lbs. .54 gb .25 
 
 60 lb. 4.80 3.30 
 
 112 1b. 8.40 2.00 
 
 6 lb. .90 gb .25 
 C< lb. 1,80 incl 
 
 6 1b. 
 
 1.80 
 
 incl 
 
 lillj. 
 
 1.80 
 
 incl 
 
 .'ilb 
 
 .65 jg 
 
 1.25 
 
 111 lb 
 
 1.30 jg 
 
 2.0(1 
 
 14 lb 
 
 .25 
 
 mcl 
 
 M lb. 
 
 .50 
 
 incl 
 
 y? lb. 
 
 .70 
 
 incl 
 
 Non\ olatile matter 
 
 , Hydrofluoric 
 
 Nouijla tile matter 
 Sulphuric \ciJ It 
 
 Calcium 
 Magnesium 
 Heavv melals 
 Hydrochloric A<.id 
 H\ dro'iiln ofluonc icid 
 Sulphurous \cid U 
 
 , Hjdrofailicofluorictech ,10' 
 Hydrosilicofluoric, c. p. 
 
 ithanO.OOS%\ 
 1 005% as SOs J 
 I than 0.005% I 
 
 than 001% V C 
 .none / A 
 
 001% as CI i 
 'B9 than 0.3% 1 
 
 nnicr „^ on. .' 
 
 Merck Blue Label .55 
 
 (Hydrofluosiliciol.. 
 
 .40 gb .14 
 1.85 incl 
 
 'i lb. 1.75 incl 
 
ACID, Hydros ilicofluoric Merck Blue Label .30 incl M lb. .75 inrl 
 
 Nonvolatile matter leas than 0.01% ) r.„„ „„, „j 
 
 Heavvmetalg no^4 ^Ti" 
 
 Sulphuric Acid Ipua than 0.028% aa SOs ) ^'''''i^^'s 
 
 ACID, Iodic, e. p., crystal .90 incl 
 
 " Iodic Merck Blue l-nhel 1.25 inol H oz. .40 incl 
 
 Test«d for solubility 1 Guaranteed 
 
 Nonvolatile matter less than 0.02.i% ( Analysis 
 
 " Iodic Anhydride, c. p 1.10 incl 
 
 (Iodine Pentoxide) 
 
 Iodic Anhydride Merck Blue Label 1-50 incl }4 oz. .50 incl 
 
 The same impurities as Acid Iodic 
 
 Lactic, pure, sp. gr. 1.20 75 cb .OS 
 
 Lactic, c. p., sp. gr. 1.21 15 incl 1.00 cb .08 H lb .30 incl 
 
 " Molybdic, c p , 85% . Baker Aniiivzed .55 incl 5.00 cb .07 ^ lb. 1.75 incl 
 
 MoUs 85%-87%i 
 
 NHi 11% i 
 
 \9 Done\ TypicHl 
 
 P none/ Analysis 
 
 Nitrate none I 
 
 Residue inaoluble in \minonia trace' 
 
 ACID, Mo!)bdic . Merck Blue Label .40 incl i^ lb. 2.50 incl 
 
 Tested for Wublhtj in >^""^on^'^) 
 
 HejM metals "0"^ f inalvaU 
 
 Pliospliorir \cid less than 000a% aa P Oi \ *""'J^'^ 
 
 ACID, Moljbdic, pure, for analysis Marquart 5.75 cb .09 
 
 Molybdic. c. p., special, 100% Baker Analyzed .80 incl 7.50 cb .07 I4 lb, 2.50 incl 
 
 Residue ioaoluble in Ammonia traco ' 
 
 ACID. Molybdic Anhydride, free from Am- 
 monia and Nitric Acid Merck Blue Label 
 
 Tested for soluliilii ■ mi \ .■ . 
 
 Alkahea. 
 
 Ammonium salts . .less IIkil. ' i .■ '.\ ' *iuarant,?ed 
 
 Heavy metals ■ in 1 Anulysi.s 
 
 Phosphoric Acid .. .less than iNiiiii.-i , ,- lii 1 
 Nitric Acid less than 0.00:i:2% u^^ N.-n-, ' 
 
 ACID. Molybdic, free from Ammonia Marquart 
 
 " Monochioracetic 
 
 " Monochioracetic, c. p 
 
 " Naphthylaminesulphonic, (a) tested 
 
 reagent, . . . ilerck Blue Label 
 
 * " Nitric, coml., 38°, in 7 lb. bottle 
 
 * " Nitric, coml., 38°, in case of 10 glass 
 
 stoppered bottles 
 
 * " Nitric, comL, 38°, in carboy 
 
 °ACID, Nitric, c. p., sp. gr. 1.42 Baker Analyzed 
 
 * " Nitric c p in 7 lb bottle Baker Analyzed 12 7 lb. .84 gb .2o 
 
 * " Nitric c p in ca e of 10 glasb tcp 
 
 pcrfd t;ottl(s Baker Analyzed .- 11 70 lb. 7.70 3,30 
 
 * " Nitric c p in (aibo\ Bil er Analyzed 10 139 1b. 13.90 2 00 
 
 ifNO 
 
 7.2.5 cb 
 
 .09 
 
 
 
 
 1.50 
 
 incl 
 
 
 
 
 1.75 gh 
 
 .1.5 
 
 
 
 
 
 
 
 ,- 
 
 
 
 
 7 lb. 
 
 ,70 gb 
 5,25 
 
 "^5 
 
 .OTA 
 
 
 70 1b. 
 
 3.30 
 
 ,0612 
 
 
 139 lb. 
 
 9,04 
 
 2.00 
 
 ,17 gb 
 
 .15 
 
 
 
 
 Fe UiMI ' fyp 
 
 141 ) 1 > 
 
 n I) 1 
 
 \ 
 
 ■"ACID Nitric puie sp _r 1 52 fuming .15 gb . !.'> 
 
 * " Nitric, c p , sp |r 1 50 Baker Analyzed ,25 gb ,15 
 
 NO lion J 
 
 CI nniKH ' Typical 
 
 SOj II lllilll 1 .4nalysis 
 
 re [Hilt I 
 
 N^on^ olatite matter (lU ) j ' 
 
 *ACID Nitric, pure, sp gr 1 bO red fuming .40 gb .1.5 
 
 * " Nitric, c. p., sp. gr. 1.60, red fuming Baker Analyzed ..SO gb .15 
 
 ° " Nitric, sp. gr. 1.153 Merck Blue Label 40 incl 7 lb. 2.10 incl 
 
 Ths same impurities as sp. gr. 1.40 
 
 ° " Nitric, sp. gr. 1.20 Merck Blue Labo! 40 incl 7 lb. 2.10 incl 
 
 The same impuritioa as ap. gr. 1.10 
 
A R 
 
 THUR H. THOM 
 
 A 
 
 S 
 
 C O 
 
 M 
 
 PAN 
 
 Y 
 
 
 Nitric, sp. gr. 1.30 
 
 The 3111116 Impurities as up. gr. 1.40 
 
 Nitric, sp. gr. 1.40 
 
 Nonvolatile mattar leaa than O.Ooi)47% \ 
 
 Sulphuric Acid less than 0,00005% aa SOj 
 
 Hydroeen halogen acida 
 
 leaa than 0.000015% aa CI \ 
 
 Heavy metala none 
 
 Earths, . , less than 0.0002% aa Ca 1 
 
 Iodic Acid and Iodine .less than 0.0005% as I 
 
 Maksr or Bf.iiiiJ 
 
 IMerck Blue Lal>el 
 Merck Blue Label 
 
 Guaranteed 
 Analysis 
 
 Merck Blue Label 
 Merck Blue Label 
 
 Ounce and p 
 
 eund prices 
 
 
 Price in oliie 
 sire pkg, 
 
 7 lb. 
 7 lb. 
 
 1 grm. 
 
 M grm. 
 
 51b. 
 
 ■ ■ 'ii ib' 
 
 3.i' lb. 
 ■4' lb. 
 
 100 grm. 
 500 grm. 
 
 'ilb 
 ■■ ^ioz 
 
 U lb. 
 
 per pkg. 
 2.10 
 
 2.10 
 
 .,., 
 
 "ACID, 
 
 Perez 
 
 cent. 
 
 per ib. 
 .40 
 
 .40 
 
 .50 
 .40 
 
 .30 cb 
 
 incl 
 
 incl 
 
 incl 
 .09 
 
 ind 
 
 °ACID, 
 
 
 
 incl 
 
 
 
 
 
 *ACID. 
 
 Nitric, fuming, sp. gr. 1.486-1.500., 
 
 The same impurities as ap. gr. 1 .40 
 
 Nitric, crude, sp. gr. 1.38 
 
 Nonvolatile residue less thaa 0.007% 
 
 Oleic, pure 
 
 Osmic 
 
 
 ACID, 
 
 
 
 
 
 
 
 1.90 
 1.00 
 .70 
 
 
 
 Osmic 
 
 Oxalic, coml., crystals 
 
 Oxalic, pure 
 
 Oxalic, c. p 
 
 
 
 
 
 
 incl 
 
 " 
 
 
 
 
 .16 cc 
 .20 cb 
 .45 cb 
 
 .75 cb 
 .70 
 
 .05 
 .09 
 
 .08 
 
 .09 
 incl 
 
 
 " 
 
 Baker Anah-zed 
 Baker .Analyzed 
 
 T„i,.] 
 Analysis 
 
 Baker Special 
 Merck Blue Label 
 
 Guaranteed 
 
 Anairsis 
 
 Kahlbaum "C.l.A. 
 Kahlbaum "C.l.A. 
 
 Certified 
 ■ Analysis 
 
 Merck Blue Label 
 
 Guaranteed 
 Analysis 
 
 terck Blue Label 
 
 uaranteed 
 naiysis 
 
 aker .Analyzed 
 
 
 
 
 " 
 
 
 
 .20 
 
 .33 
 
 .25 
 
 .90 
 2.50 
 
 .60 
 .30 
 
 .25 
 
 incl 
 
 
 .13 
 
 inc! 
 
 
 
 SOs -0.0001%/ 
 
 CaO 0.001% 
 
 
 
 I'b.;.:.:::;:;;::::::":::;'';";:;-- nonV 
 
 
 ACID 
 
 Oxalic, c. p., (carefully dried for 
 
 standardizing) 
 
 Oxalic 
 
 incl 
 incl 
 
 
 .35 
 
 .20 
 .65 
 .90 
 
 .15 
 
 incl 
 
 incl 
 
 cb .04 
 
 incl 
 
 incl 
 
 
 ACID 
 
 Sulphuric Acid leaa thaa 0.004% aa SO, 1 
 
 Chlorides losa than 0.0004% as CI ( 
 
 Heavy metala none 
 
 pounds less than 002% aa NHj) 
 Nitric Au.i leas thin 007% as NjO. 
 
 Oxalic 
 Oxalic 
 
 Non\olatile matter none 
 Chlorine none J 
 
 Nitn: \cid none'"'" 
 \n,moQimn salta none! 
 Hea^ \ metals none f ■= 
 Content 90 00% 
 
 Perchloric 
 
 Noinolitile matter le=- than 005% 
 ^ulphuni \cid leH'i thiTj OOOoSaaSOj 
 H\ irochloni Acid Icii th ui llOU5% as CI 
 B inum le,s than 0025% 
 ir, ..> inttals none 
 Phosphomolybdic, c p, 10% sol.. 
 Phosphomolybdic crystal'' 
 Pho phomo ybd 
 
 H m 
 E es 2^ 
 
 incl 
 incl 
 
 ACID 
 
 1..35 gb 
 
 .15 
 
 incl 
 
 „ 
 
 
 
 
 ACID 
 
 .40 gb 
 
 .15 
 
 incl 
 
 
 H 
 
 !.'a'l"sis 
 
 
 
 
 
 
 
 
 ACID 
 
 Phospho p 
 
 lerck Blue Label 
 
 
 
 .70 
 
 incl 
 
 i;ib 
 
 .30 
 
 incl 
 
 
 
 
 
 H 
 
 luaranteed 
 
 
 
 
 
 
 
 
 ACID Ph ph 
 
 Phosphoric, ortho, sp. gr. 1.12, 
 
 The same impuriliea as sp, gr. 1.7 
 
 Phosphoric, ortho, sp. gr. 1.057 
 
 The same impurities aa sp. gr, 1.7 
 
 Phosphoric, c. p., meta 
 
 Phosphoric, meta, stick {contains 
 Sodium Phosphate) — 
 
 Merck Blue Label 
 Merck Blue Label 
 
 .45 
 
 gb .15 
 incl 
 
 60 incl 
 
 incl 1.00 gb .15 
 inc! .70 cb .OS 
 
 }ilb. .20 
 
 Mlb. .25 
 
 'i lb. .45 
 
 I4 Ih. .50 
 
ACID, Phosphoric, meta Merck Blue Label 85 incl ii ib. .30 incl 
 
 Nitric Acid le^s than 0.01G% as NiOtN 
 
 Sulphates Iraa than 0.088% as SOi J 
 
 Hydrogen halogen f 
 
 aeids less than 0.0005% aa CI \ Guaranteed 
 
 Heavy Metala none / Analysifi 
 
 Eaitha. etc less than 0.02% aaCal 
 
 Arsenic leas than 0.0015% 1 
 
 Osldizable substances none/ 
 
 *ACrD, Phosphoric Anhydride 25 incl 1.25 gb .15 U lb. .45 incl 
 
 * " Phosphoric Anhydride Merck Blue Label .20 inc! H 'b. .80 ioel 
 
 Arsenious Acid leas than 0.01% 
 
 " Phosphotungstic, 10% solution 1.00 cb .08 
 
 " Phosphotungstic, crystals , . . . . 35 gb .07 
 
 " Phosphotungstic Merck Blue Label .45 incl I'iWi- 1-35 incl 
 
 Nitrates less than 0.0032% as NsOi ( Guaranteed 
 
 Ammonium salts,, .less than 0.0045% as NHi ) Analysis 
 
 ACID, Phthalic, c. p., anhydrous Baker Analyzed .2:> 2.50 cb .12 '^ ib. .75 ^ncl 
 
 " " Picric, c. p., crystals. Dry Picric 
 Acid is classed as a high ex- 
 plosive and can only be 
 shipped subject to the regu- 
 lations governing the trans- 
 portation of goods of this 
 class. If 20% water is added 
 Picric Acid can be shipped 
 
 with other chemicals 
 
 ACID, PjTogallic, resublimed 
 
 " Pyrogallic Merck Blue Label 
 
 Inorganic matter, , less than 0.05% | Guaranteed 
 
 Gallic Acid leas than 1% ( Analysis 
 
 ACID, Pyroligneous, technical 
 
 " Rosolic 
 
 " Rosolic Merck Blue Label 
 
 Tested for Sensitiveness 
 
 " Salicylic, pure 
 
 " Salicylic, from Wintergreen Oil 
 
 " Silicic, coml., powder 
 
 " Silicic, c. p Baker Analyzed 
 
 " Silicotungstic Merck Blue Label 1.50 
 
 .Sulphates .none l 
 
 Chlorides les8tlian0.002.S%a3Clf r-,,,..,,.^^^ 
 
 Tungstato wne - Analvsis 
 
 Mercury and other heavy metals noneL "■"'"'*"' 
 
 Residue on ignition.,,. 8.1-93%' 
 
 ACID, Stearic, U, S, P., powder 35 cb .10 
 
 " Succinic, c. p 60 incl 
 
 " Succinic Merck Blue Label .80 incl ^i oz. .25 incl 
 
 Nonvolatile matter less than 0.05%- 
 
 Oxalic Acid less than 0.07% 1 
 
 Tartaric Acid le3SthaQ2%f ^ „ , . 
 
 Sulphates less than 0.001% ss SO, / Guaranteed 
 
 Chlorides less than 0.002% aa CI 1 *"^"sis 
 
 Ammonium salts... less than 0.0035% afl NHtJ 
 Heavy metala none 
 
 ACID, Sulphanilic, crystals 20 incl 1.50 cb .09 ^i lb. .55 incl 
 
 " Sulphanilic Merck Blue Label .25 iul'I 
 
 Inorganic matter less than 0,05% i 
 
 Sulphuric Acid {Ani- / „ , . 
 
 line Sulphate) leas than 0.004% as SO, > Guaranteed 
 
 Hydrochloric Acid (Ani- Analysis 
 
 line Hydrochloride),, lesa than 0.002% aa Oil 
 
 •ACID, Sulphuric, coml., in 9 lb. bottle 06 9 lb. .54 gb .'25 
 
 " " Sulphuric, coral., in case of 10 glass 
 
 stoppered bottles 
 
 * " Sulphuric, coml., in carboy 
 
 " " Sulphuric, c. p., sp. gr. 1.835-1.84.. Baker Analyzed 
 
 * " Sulphuric, c. p., in 9 lb. bottle. , , . Baker Analyzed 
 
 * " Sulphuric, c. p., in case of 10 glass 
 
 stoppered bottles Baker Analyzed 
 
 * " Sulphuric, c.p., in carboy Baker .Vnalyzed 
 
 Sp.gr I,835-1.84\ 
 
 HiSO. B5,6-96.4%J 
 
 HCl none/ 
 
 As. , none \ Typical 
 
 Fe —.0001% / Analysis 
 
 Nonvolatile matter .0002%| 
 
 NHj trace 1 
 
 8b none/ 
 
 .20 
 .17 
 15 
 
 incl 1.25 cb 
 incl 1.75 
 incl 
 
 .08 
 incl 
 
 h'lb. 
 ■i Ib. 
 
 ■ 'ii ib. 
 
 .35 
 .50 
 
 incl 
 incl 
 
 
 
 .09 . 
 
 
 
 '>5 
 
 incl 
 
 
 'lO 
 
 
 
 
 
 
 .40 cb 
 
 .09 . 
 .09 . 
 .04 . 
 
 .12 
 
 
 
 '? 
 
 incl 3.00 cb 
 
 
 
 
 .30 ■ 
 
 
 .10 
 
 .sn 
 
 incl .80 cb 
 incl 
 
 incl 
 
 ■03H 
 
 90 lb. 
 
 3.15 3.30 
 
 .021 5 1S7 lb, 
 
 .14 gb .15 
 
 .09 9 lb. 
 
 4.68 2.00 
 
 :si gij ■ ;25 
 
 .08 
 
 90 lb. 
 
 7.20 3.30 
 
 .07 
 
 187 lb. 
 
 13.09 2.00 
 
T H O M 
 
 NH./ 
 
 Sulphuric, sp. gr. 1.84 
 
 Nonvolatile matter lega than O.boOsVo^ 
 
 Nitric Anid leas than 0,0008% as NaOs 
 
 Selenium IftSB than 0.0033% 
 
 fauhatanees o^ldizahle by Permanganato i 
 
 (Nitroiia and Sulphurous Acids) I 
 
 „ , ^ , leaa than 0.001% a -" 
 
 Hydrogen halogen 
 
 arida le.is than 0,0003% 
 
 Load lesa than O.OOS^o 
 
 Heavy metals none 
 
 Calcium Ie33 tliati 6.0055% 
 
 Ammonium salts. , .leas than 0.0015% aa NHi 
 Arsenic leaa than 0.0000025%' 
 
 Sulphuric, diluted, 16% 
 
 The aame impurities as sp. gr. 1.84 
 
 Sulphuric, diluted, 10% 
 
 The .same impuritiea asap. gr. 1. 84 
 
 Sulphuric, c. p 
 
 (Froe from Nitrogen Compounda) 
 Sulphuric, comi., fuming, 20%, SO3, 
 Sulphuric, c. p., fuming, l.'i% SO3, . 
 Sulphuric, fuming 
 
 Nitroffen . _ leas than 0.001% 
 
 Sulphuric, fuming, free from Nitro- 
 gen 
 
 Nonvolatile matter !e.ga than 0.009%,, 
 
 Nitrle Aeid 
 
 less than 0.004% aa NjOl = 0,00 1%N 1 
 Ammonium salts, .. .less than 0.002% aa NHj 
 
 Halogens. leas than 0.0015% as CI | 
 
 Lead lesa than 0.003% 
 
 .-Vrsenic leaa thanO.0001%- 
 
 Sulphuric, with P2O& 
 
 Nitric Aeid leaa than 0.004% as NjOt ( 
 
 Ammonium salta. .. .less than 0,002% as NHi t 
 
 Sulphuric, fuming, with PaOs 
 
 Nittogen leaa than 0.001% 
 
 " " Sulphuric Anhydride, tested reagent 
 ° " Sulphuric Anhydride, tested reagent 
 " " Sulphurous, c. p., 6% SOi. 
 
 SOs 
 
 SOs 
 
 Fe 
 
 Nonvolatile matter 
 
 ''ACID, Sulphurous, 6% 
 
 Nonvolatile matter leas than 0,048% 
 
 " Sulphurous, cubes, 20%, tested 
 
 reagent 
 
 " Tannic, pure 
 
 " Tannic, c. p 
 
 " Tannic 
 
 oiganic matter less than 0,13o%~ 
 
 Maheror Erand 
 
 Merck Blue Label 
 
 e pk)(« per pkg. 
 
 9 ib. 2.70 
 
 Merck Blue Label 
 Merck Blue Label 
 Baker Special 
 
 'ACID, 
 ♦ACID, 
 
 Merck Blue Label 
 Merck Blue Label 
 
 Merck Blue Label 
 
 Guaranteed 
 Analysis 
 
 Merck Blue Label 
 
 Merck Blue Label 
 Merck Blue Label 
 Baker Analyzed 
 
 Merck Blue Label 
 Merck Blue Label 
 
 .40 incl 
 
 9Ib. 
 
 2,70 incl 
 
 .40 iiicl 
 
 9 1b, 
 
 2.70 incl 
 
 
 9 1b, 
 
 1,08 gb .25 
 1.08 gb .25 
 
 ,12 
 
 .25 gb .15 
 ,45 inci 
 
 9 1b. 
 
 .20 gb 
 
 Mlb. .75 incl 
 
 .1 Kilo Tins 1.25 incl 
 
 .50 gm -65 incl 
 
 15 5 1b. .60 gb .25 
 
 Merck Blue Label 
 
 .60 incl Jilb. .25 incl 
 
 1.10 cc .08 
 
 1.50 incl 
 
 H lb. .80 incl 
 
 13 than 
 
 e than 12% ' 
 
 ACID, Tartaric, cryst 
 
 " Tartaric, powdered 
 
 " Tartaric, c. p., crystals.. 
 
 " Tartaric, c. p., powder.. 
 
 Nonvolatile matter 
 
 SOi.. 
 
 Fe. 
 Pb. 
 
 .001% 
 
 ACID, Tartaric 
 
 Sulphuric Aeid leaa than 0.005% aa SOj 
 
 Oxahc Aeid less than 0.035% 
 
 Calcium less than 0.01% 
 
 Lead and other naetala none 
 
 Inorganic matter less than 0.05% 
 
 ACID. Thioacetic 
 
 Nonvolatile matter leas than 0.0047% 
 
 Sulphuric Acid leaa than 0.003% as SOa 
 
 ACID, Titanic, c. p., anhydrous (Tita- 
 nium Oxide). 
 
 " Trichloracetic, pure, crystals 
 
 " Tungstic 
 
 " Tungstic, c. p 
 
 " Uric, c. p 
 
 " Valerianic (Valeric) 
 
 ADONITE 
 
 Baker Analyzed 
 Baker Analyzed 
 
 Merck Blue Label 
 
 incl 
 incl 
 
 .45 cc .05 
 
 .45 cc .05 
 
 .75 cb .OS H lb. 
 
 .80 cb .08 J4 lb. 
 
 U lb. 
 
 Merck Blue Label 
 I Guaranteed 
 ) Analysis 
 
 K lb. .90 incl 
 
 incl 
 
 .18 gb .07 2.00 gb .14 
 
 ,25 cb .03 
 
 .45 incl 
 
 .75 cb .03 
 
 .20 gb -07 1.75 gb .15 
 
 1 grm. 1.50 
 
AGAR AGAR, in shreds, prime, white. 
 This is a specially selected 
 grade for preparation of 
 
 culture media 
 
 " powder 
 
 ALBUMEN, from blood 
 
 " from eggs, soluble scales 
 
 " from eggs impalpable powder 
 
 "ALCOHOL, Amylic 
 
 " Amylic, purified 
 
 Amylic, c.p 
 
 A.H.T.Co. No. 40 
 Witte 
 
 .25 cb .03 2.00 cb .08 
 
 .45 
 
 Sp- p 
 
 814 1 
 
 R. P 128''-130''C 
 
 "ALCOHOL, Amylic. for Gerbers fat deter- 
 mination, tested re- 
 agent 
 
 ° " Amylic 
 
 Nonvolalile m^tUr less thau 005% | 
 
 Foreign organic njatter (Furfural etc ) none j 
 
 "ALCOHOL, Butylic, iso, b p 106° C 
 ° " Ethylic, denatured 
 
 ° " Ethyhc, denatured 
 
 ° " Ethylic, denatured 
 
 " " Ethylic, denatured 
 
 ° " Ethylic, denatuied 
 
 Ethylic, <in% 
 
 He.9idue nf>ne\ 
 
 Fusel Oil noiiL J 
 
 Molaaws llc-ohol nonef 
 Aldehjde 
 
 Metals and Tann 
 
 Baker Analyzed 
 
 Typical 
 
 A DB lysis 
 
 Merck Blue Label 
 Merck Blue Label 
 
 Guaranteed 
 Analysis 
 
 Merck Blue Label 
 
 "ALCOHOL 
 
 Ethiti 
 Fth 1 
 Ethylic 
 Eth^h 
 Fthil 
 Eth lie 
 
 lea han 
 le than 
 
 fgra n) 
 
 0001 J 
 
 'ALCOHOL Elhilu I (gia n) 
 
 Baker Analyzed 
 
 ( Typical 
 i Analysis 
 
 Merck Blue Label 
 
 1.15 cb 
 
 1.25 cb 
 
 .60 cb 
 
 .75 cb 
 
 1.25 cb 
 
 1.25 
 1.60 
 
 >i lb. .40 
 
 li lb. 
 
 .40 
 
 incl 
 
 Jilb. 
 
 .50 
 
 incl 
 
 " 1 pt'. 
 
 .15 cb 
 
 '.09 
 
 Iqt. 
 
 .25 cb 
 
 .12 
 
 H gal. 
 
 .40 en 
 
 .18 
 
 Igal. 
 
 .75 en 
 
 .25 
 
 5 sal. 
 
 3.50 en 
 
 Ml 
 
 ■ilb. 
 
 .35 
 
 mcl 
 
 1 pt. .50 cb 
 1 qt. I.OO cb 
 J^o gal. 1.75 en 
 i gal. 3.25 en 
 4T.'^ gal. 15.35 en 
 1 gal. 3.25 cb 
 
 h'Ib. 
 
 Molasses \lcohol 
 Aid eh de 
 
 Mp a and Taniuii 
 
 le s than "" I 
 M than 001%/ 
 
 "ALCOHOL Ethylic, ab^ lute, m 8 ", 
 
 Elhylic, absolute, 99.8% 
 
 Ethylic. absolute, 99.8% 
 
 Ethylic, absolute, 99.8% 
 
 Ethylic, absolute, 99.75% 
 
 ° " Ethylic, absolute 
 
 Ajdehvde. (HjSOj test one-half hour) 
 
 Ethylic, absolute. 99. 46%^ 
 
 Residue none 
 
 Fusel Oil none 
 
 Molasses Alcohol none 
 
 Aldehyde . ,, none 
 
 Organic impurities. 
 Metals and Tannin 
 
 Acetone less than 
 
 Furfural less than 
 
 "ALCOHOL, Ethylic, absolute, 99.8% 
 
 Ethylic, absolute, 99.8% 
 
 Ethylic. absolute, 98% 
 
 "ALCOHOL, Methylic (wood) 
 
 ^ " Methylic (wood) 
 
 " " Methylic (wood) 
 
 ° " Methylic (wood) 
 
 " " Methylic (wood) 
 
 Methylic, 95% 
 
 " " Methylic, absolute 
 
 Sp.gr .70B 
 
 Methyl Alcohol 90%-100% 
 
 Nonvolatile matter none 
 
 Ethyl AiRohol'.'.'!.'.'.'.'.'''']! none 
 
 Baker Analyzed 
 Baker Special 
 
 .75 cb .08 
 .85 cb ,08 
 
 'c " 
 
 .n 0.02% } 
 0.0001%/ 
 
 Merck Blue Label 1.60 
 
 Kahlbaum 
 
 Kahlbaum 
 Squibb 
 
 1 ],l. 
 
 .70 cb 
 
 09 
 
 1 (lt„ 
 
 1.40 cb 
 
 12 
 
 ,r.il. 
 
 2.50 cb 
 
 IS 
 
 1 pal 
 
 4.40 cb 
 
 ■£> 
 
 1 sal. 
 
 4.50 cb 
 
 25 
 
 If lb. .50 
 
 Baker Analyzed 
 Baker Analyzed 
 
 .25 cb 
 .50 cb 
 
 500 grm. 
 
 1.50 incl 
 
 000 grm. 
 
 2.75 ii 
 
 cl 
 
 500 grm. 
 
 1.35 incl 
 
 Ipt. 
 
 .15 cb 
 
 119 
 
 Iqt. 
 
 .25 cb 
 
 12 
 
 hi gal. 
 
 .40 en 
 
 IS 
 
 1 gal. 
 
 .75 en 
 
 25 
 
 5 gal. 
 
 3.50 en 
 
 .511 
 
 Igal. 
 
 .95 cb 
 
 2.5 
 
 1 gal 
 
 2.75 cb 
 
 25 
 
"ALCOHOL, Methylic, 97-98.7% (Colum- 
 bian Spirits) 
 
 " Methylic, same as above 
 
 " " Methylic, as specially recom- 
 mended for uae in y 
 preparation of ' 
 Wfight's, Hastings' 
 and Romanowsky's 
 blood stains Merck "H. P." 
 
 "ALCOHOL, Methylic, Acetone free Kahlbaum 
 
 " Methylic, Acetone free Kahlbaum 
 
 " " Methylic Merck Blue Label 
 
 Nonvolatile matter. , .less than 0.002%\ 
 
 Acetone less than 0.015% i 
 
 Ethyl Alcohol less than 1% I 
 
 Empyreumatic substances none \ Guaranteed 
 
 Aldehydes. none / Analysis 
 
 Substances oxidizable by Per- I 
 
 manganate none l 
 
 Chloroform less thau 0.01%/ 
 
 "ALCOHOL. Propylic. pure 
 
 "ALDEHYDE, pure, 50% 
 
 ° " pure, concentrated 
 
 ALIZARINE, paste, 20%, 
 
 " ((Sodium Monosulphonate) as 
 recommended for use in gas- 
 tric analysis 
 
 ALOIN, as used for "occult" test for blood 
 
 in faeces 
 
 ALPHANAPHTHOL Merck Blue Label 
 
 Organic Substances insoluble iti i 
 
 I gal. 1.25 cn .25 
 1 pt. .20 cb .09 
 
 .500 grm. 1.25 cb .12 
 
 100 grm. .40 cb .05 
 
 1-4 lb. .30 incl 
 
 .30 cb .04 2.50 cb .10 
 
 80 cb .09 
 
 1.15 (;b .09 
 
 .10 cb .03 
 
 Sodium Hydroxide solution. . ..none ( Guaranteed 
 
 Organic Acids none ( Analysis 
 
 Inorganic matter leas than 0.05%,' 
 
 ALPHANAPHTHYLAMINE Merck Blue Label 
 
 Testeil for. solubility I Guaranteed 
 
 Nonvolatile matter, . . .less tban 0.05% i Analysia 
 
 ALUMINUM, metal, foil 
 
 " metal, sheet 
 
 " metal, mossy 
 
 " metal, powder, fine 
 
 " metal, powdered ■ 
 
 wire, No. 24B & S 
 
 ALUMINUM, Acetate, c. p Baker Analyzed 
 
 " Ammonium Sulphate (Ani- 
 
 moniuru Alum) coml., cryst 
 
 " Ammonium Sulphate, coml., 
 
 powder 
 
 " Ammonium Sulphate, c. p., 
 
 crystals Baker Analyzed 
 
 " Ammonium Sulphate, c. p., 
 
 powder Baker Analyzed 
 
 Chloride, c. p., crystals Baker Analyzed 
 
 Fe . .004% ( Typical 
 SOi"-""" 003%) Analysis 
 
 ALUMINUM Chloride, c. p. , sublimed 
 
 Fluoride, 
 
 .25 
 
 .90 
 
 1.20 incl 
 
 .15 cb .03 1.50 incl 
 
 1.25 incl 
 
 .15 incl .75 incl 
 
 .12 
 
 incl 
 
 .90 cb .09 
 .10 cc .05 
 .15 cc 
 
 .25 cb 
 
 .05 
 .OS 
 
 Hydroxide, pure ^ : - ' 'r ]' ' ], ' 
 
 Hydroxide, c. p Baker Ana yzed 
 
 , crystals Baker Analyzed 
 
 Baker Analyzed 
 
 " " Nitrate, c. 
 
 " Oxalate, c. p.. 
 
 " Oxide, pure .;..■',■■■■."■ i ■" V ' ' 
 
 Oxide, c. p. (ignited) Baker Analyzed 
 
 pp. 005%1 
 
 C] 0001% ( Typical 
 
 S63 ■ ■ ■ ■;:;:;:;:; 001% < Analysis 
 
 CaO °o°«. 
 
 ALUMINUM Oxide, for Tannin determi- 
 nation by Wishcenus 
 method Merck Blue Label 
 
 Metallic Mercury and Aluminum i 
 
 Tester! for absorptive power tor Tan- 1 Analysis 
 
 iiin and colors. . . 
 
 ALUMINUM Phosphate, c. p '^'^'^^'^ Analyzca 
 
 Potassium Sulphate (Potas- 
 sium Alum), crystals - 
 
 " Potassium Sulphate, purified, 
 
 powder 
 
 .27 cb 
 
 .12 incl .80 cb 
 
 .20 incl 1.50 cb 
 
 1.50 cb 
 
 60 cb 
 
 1.50 cb 
 
 .10 incl .75 cb 
 
 1.20 cb 
 
 1.00 cb 
 
 1.00 cb 
 
 1..>0(-I. .12 
 .10 vi- .0.5 
 .10 cc .05 
 
 I4 lb. .75 
 
 H lb. .30 
 
 Jilb. 
 
 I4 lb. 
 U lb. 
 
 U lb. 
 
 .50 
 .50 
 
 incl 
 incl 
 
 '"ii lb'. 
 
 .150 
 
 incl 
 
 U lb. 
 
 :a 
 
 incl 
 
 H lb. 
 
 .4(1 
 
 incl 
 
 14 oz. .25 incl 
 
 i^ lb. .50 Lncl 
 
■ ALUMINUM Potassium Sulphate, c. p., 
 
 crystals Baker Analyzed 
 
 *' Potassium Sulphate, c. p., 
 
 powdered Baker Analyzed 
 
 Fe 002%', 
 
 CI (""302%( Typical 
 
 CaO 001% ( Analysis 
 
 MgO 001%! 
 
 ALUMINUM Sodium Sulphate, c. p. {So- 
 dium Alum) Baker Analyzed 
 
 " Sulphate, eomi 
 
 " Sulphate, pure 
 
 " Sulphate, c, p., crystals .... Baker Analyzed 
 
 " Tartrate, c. p Baker Analyzed 
 
 ALUNDUM, RR, 60, 90 or 120 mesh 
 
 RR, 60, 90 or 120 mesh 
 
 RR, 60, 90 or 120 mesh (Spe- 
 cially treated and free from 
 
 surface alkali) 
 
 RR, 60, 90 or 120 mesh (Spe- 
 cially treated and free from 
 
 surface alkali 
 
 AMMONIA, gas, in valve top steel cylin- 
 ders, returnable for credit if 
 
 in good condition 
 
 AMMONIUM Acetate, c. p Baker Analyzed 
 
 .25 cb .08 
 .30 cb .08 
 
 .20 cb 
 .30 cb 
 1.90 cb 
 
 34 lb. .15 inci 
 }i lb. .15 incI 
 
 CI.. 
 
 SOs. 
 
 .001% ) 
 
 AMMONIUM Acetate. . . . 
 
 Nonvolatile m 
 
 Chlorides 
 
 Sulphates 
 
 Heavy metals 
 
 Eartha , less than 0.004% 
 
 Typical 
 r Analysis 
 
 Merck Blue Label 
 
 tter...lesathan 0.0167% i 
 
 less than 0.0005%, as CI f r-..=r=„.». 
 
 .ss than 0.0075% as SO, - J^V^f ' 
 
 U lb. .60 incl 
 1^ lb. .30 inel 
 21b. 1.00 incl 
 
 }^ lb. .40 incl 
 2 lb. 1.50 incl 
 
 10 1b. 10.00 '-■yi 15. 00 
 
 }i lb. .25 incl 
 
 J-4 lb. .30 incl 
 
 AMMONIUM Arsenate, c. p 
 
 Baker Analyzed .15 incl 1.35 cb 
 
 07 
 
 K lb. 
 
 .4.T 
 
 incl 
 
 " Arsenite, c. p 
 
 Baker Analyzed .15 incl 1.20 cb 
 
 OS 
 
 H lb. 
 
 .40 
 
 incl 
 
 " Benzoate, c. p 
 
 " Bicarbonate, c. p.. 
 
 
 1.00 cb 
 
 im 
 
 
 
 
 
 
 ns 
 
 "ii "lb. 
 
 '>0 
 
 
 
 45 cc 
 
 .75 cb 
 
 05 
 07 
 
 
 
 " Bichromate, c. p.. 
 " Bifluoride, c. p ,. . . 
 " Binoxalate, c. p.. . 
 " Bisulphate, c p 
 " Bisulphite, c p cc 
 
 Baker Analyzed 
 
 .30 
 
 
 
 
 
 
 
 
 
 70 cb 
 
 m 
 
 Klb. 
 
 ■^n 
 
 
 
 .50 cb 
 
 OS 
 
 
 
 
 
 
 
 ?4 Ih. 
 
 
 
 1 ?2, 
 
 
 
 
 
 Nonvolatile matttr 
 
 CI 
 
 SO, 
 
 gPf Typical 
 
 
 
 
 
 
 
 
 
 
 
 
 
 AMMONIUM Bitartrate 
 
 
 75 cc 
 
 (15 
 
 
 
 
 Bitartrate, c p 
 
 Biker Analyzed 
 
 1.50 cb 
 
 OS 
 
 
 
 
 Borate, c p 
 
 
 
 
 
 
 
 
 1.00 cb 
 
 OS 
 
 M!b. 
 
 .35 
 
 
 " Carbonate, lump 
 
 
 20 cc 
 
 0.=i 
 
 5 1b. 
 
 .90 
 
 incl 
 
 Carbonate, c p 
 
 Baker Analyzed .10 incl .30 cb 
 
 09 
 
 ^\h. 
 
 .15 
 
 incl 
 
 Nonvolatile matter 
 
 0004% 1 
 
 
 
 
 
 
 Fe 
 
 
 
 
 
 
 
 CI 
 
 0Q01%' Typical 
 
 
 
 
 
 
 &Ui 
 
 none/ Analysis 
 trace 1 
 
 
 
 
 
 
 Organic matter 
 
 
 
 
 
 
 ThiOGj anjte 
 
 
 
 
 
 
 AMMONIUM Carbonate 
 
 Merck Blup Label , . 
 
 .55 ii 
 
 rl 
 
 }-4 lb. 
 
 .I'.'i 
 
 incl 
 
 Nonvolatile matter 
 
 ess than 0.01%\ 
 
 
 
 
 
 
 
 
 
 
 
 
 Sulphate less than 0.01% as SOil 
 
 
 
 
 
 
 Chlorides less than 0.00025%, as CI f 
 
 
 
 
 
 
 Thiosulphatea 
 
 \ Guaranlced 
 
 
 
 
 
 
 
 s (NHi); SjOi / Analysis 
 
 
 
 
 
 
 Phosphates leas than 0.01%, aa PsOb I 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Sulphocyanatea, less than 6.12% as SCN } 
 
 
 
 
 
 
 
 
 
 
 
 
 
 AMMONIUM Carbonate 
 
 Kahlbaum "C.f.A." , 
 
 
 
 100 grm. 
 
 50 
 
 incl 
 
 
 Kahlbaum "C.f.A." . 
 
 i 
 
 
 
 500 grm. 
 
 .95 
 
 
 
 
 
 
 Chlorine non 
 
 \ in 10 ' Certified 
 
 
 
 
 
 
 Sulphocyanate non 
 
 
 
 
 
 
 Thiosulphate non 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Tarry matter non 
 
 
 
 
 
 
 
 AMMONIUM Chloride, granular, 
 
 pure 
 
 17 cc 
 
 US 
 
 
 
 
[ Chloride, <_ p 
 
 Nc n\ olal lie mattpr 
 
 Maker Of Br^nd 
 
 . . Baker Analyzed 
 
 lel Typical 
 7b ( Analysis 
 
 Kahlbaum ' 
 Kahlbaum ' 
 
 C.f.A.' 
 ■C.f.A.' 
 
 AMMONIUM < 
 
 1 
 
 AMMONIUM I 
 
 001% 
 
 n 25% 
 
 Baker Special 
 
 Typical 
 
 Baker Analyzed 
 Merck Blue Label 
 
 Baker Analyzed 
 
 i^Qilmo drrii atives 
 
 [ Chloride . . . Merck Blue Label 
 
 Nonvolatile naatfer less than 0.0i%\ 
 Pho^phuU-s les3 than 001% as PsOi J 
 Vrsenatea leaa thin 005% da AajOtf 
 Hcaw metals ...noneV Guaranleed 
 
 Calcmm leis thin 0.01% / Analysis 
 
 Sulphates leas than 005% as SOil 
 
 Suiphocj anates less than 12% as SON 1 
 Tar haees . . , none/ 
 
 [ Chloride 
 Chloride 
 
 Non\olatile matter 
 Sulphate 
 Sulphocv jnatP 
 Phosphate and A.r e 
 
 Alkaline earths 
 Tarrj matter 
 
 [ Chloride, c p 
 
 Non\olatile matter 
 Aniline dumatives 
 
 [ Chromate, c p 
 Chromate 
 
 Alkahes not ir . 
 
 riilondes less than 0025' 
 Sulphates less than 021% as HOs 
 Aluminum leii than 1% 
 
 Calcium le s than 005% 
 
 AMMONIUM Chromium Sulphate, c p. . , 
 
 " Citrate, c. p Baker Analyzed 
 
 " Citrate Solution Merck Blue Label 
 
 Contains. ,27.93 grams Ammonia per liter. 
 
 " Dithiocarbonate Solution . . . Merck Blue Label 
 
 Nonvolatile matter less than 0.005% i ^. „„,„„j 
 
 Ammonium Carbonate [ 9""i""i 
 
 leas than 0.0045% as (NHO^CO.i Analysis 
 
 AMMONIUM Fluoride, c. p Baker Analyzed 
 
 i^.;;-::::::-::::::;:;:::::Srr^ 
 
 Nonvolatile matter 008%! *"»'>'«•« 
 
 AMMONIUM Fluoride Merck Blue Label 
 
 Nonvolatile matter less than 0.005% j 
 
 Chlorides less than 0.001% "" ' 
 
 Sulphates leas than 0.3% uj C3i.ij - . „,„ . 
 
 SiUcofluorlde3....1esa than 0,015% (NH^jiSiPcl Ana'>'s's 
 Heavy metals none ' 
 
 AMMONIUM Fluoride Kahlbaum "C.f.A.' 
 
 Nonvolatile matter. .unweighablet J 
 
 lli'^.^fl*^.iH» ^nn! i^'O 'certified 
 
 Heavy metals none ' J 
 
 AMMONIUM Formate, c. p Baker Analyzed 
 
 * " Hydroxide, 20° (17.5% Am- 
 
 monia), in 4 lb. 
 
 bottle 
 
 * " Hydroxide, 20°, in case of 10 
 
 glass stoppered 
 
 bottles 
 
 * " Hydroxide, 20° in carboy 
 
 ° " Hydroxide, c. p., sp. gr. 0.90. Baker Analyzed 
 
 * " Hydroxide, c. p., in41b. bot. Baker Analyzed 
 
 * " Hydroxide, c. p., in case of 10 
 
 glass stoppered 
 
 bottles Baker Analyzed 
 
 * " Hydroxide, c. p., in carboy. Baker Analysed 
 
 Sp.gr 90] 
 
 NH. 28-2»%/ ^,,„, 
 
 pSa<iiae;::;::::::::::::::::::t«..i''"'"" 
 
 Nonvolatile matter 0.0004% ) 
 
 *AMMONIUM Hydroxide, c. p., free from 
 
 Pyridine Baker Special 
 
 Hydroxide, 10% and 20%... Merck Blue Label 
 The same Impurities as the 28% 
 
 11 
 
 .10 inol .30 cb .10 M lb. .15 incl 
 
 Klb. 
 
 100 grm. .60 incl 
 500 grm. 1.20 incl 
 
 H lb. .15 incl 
 
 1.80 cb .10 Ji lb. .SO inol 
 
 .25 incl M lb. 1.25 incl 
 
 2.00 cb .08 
 1.50 cb .09 
 
 H liter .50 incl 
 'A lb. .50 incl 
 
 .20 incl 2.00 incl ij' lb. .75 incl 
 
 M lb. .65 incl 
 
 Guaranteed 
 
 100 grm. 1.15 incl 
 
 .13 gb .15 
 
 4 lb. .40 gb .26 
 
 40 lb. 3.60 3.30 
 85 lb. 6.80 2.00 
 
 4 lb. .48 gb .25 
 
 401b. 4.40 3.30 
 94 lb. 9.40 2.00 
 
 .18 4 lb. .72 gb .25 
 
 .35 incl 4 lb. 1.00 incl 
 
Maksror Brani 
 
 "AMMONIUM Hydroxide. 28% Merck Blue Label 
 
 NoQvolatJle matter . . . less than 0.016%\ 
 
 Chlorides leaa than "^ ^ 
 
 Pyridine at 
 
 Tar bases (Aniline, Pyridine, Pyrrol, j 
 
 Heavy metals. none| 
 
 Sulphates less than 0.0025% as SOi 
 
 Carbon Dioxide leas tban 0.115% 
 
 Sulphides leas than 0.001% aa Sl 
 
 Calcium lesa than 0.002% 
 
 Magoeaium less than 0.001% 
 
 Phosphatci. . . leas than 0.0015% as P20i 
 Substances ovidizable by Potas- 
 sium Permanganate none 
 
 AMMONIUM Hydrosulphide, (See Sul- 
 phide). 
 
 " Iodide, c. p 
 
 " " Molybdate, c. p., Nitric Acid 
 
 solution 
 
 , crystals. . 
 
 0-5% 
 
 Nitrate 
 
 AMMONIUM Molybdate 
 
 Baker Analyzed 
 
 ( Typical 
 /' Analysis 
 
 inci 
 incl 
 
 .2.5 gb 
 5.00 cb 
 
 Phosphites 
 
 Sulp hitea 
 Chloridps 
 
 n 0005% a 
 
 less than 175% 
 
 leas than OOn 
 
 Nitratea le^i than 0032% a; 
 
 "AMMONIUM Nitrate, pure crystals 
 " " Nitrate, c p 
 
 Nonvolatile matter 00; 
 
 Fe OO: 
 
 CI — 00 
 
 sOj n: 
 
 I nc 
 
 ra( . tri 
 
 "AMMONIUM Nitrate 
 
 Nonvolatile m; 
 Phosphatei I 
 Arsenates l< 
 Heav> metals 
 r-alcium 
 Sulphates 
 Sulphooj anate 
 Tar ba.iea 
 Chlorides 
 
 ".■Cll ' 
 
 Baker Analyzed 
 
 ter leaa than 0.01%\ 
 
 is than 001% ' 
 
 i than 005% a 
 
 Merck Blae Label 
 
 lesi than 00'i% ; 
 leas than 12% a; 
 
 Ni r 
 "AMMONIUM Nitrate 
 
 " " Nitrate 
 
 NiiujUtile 
 
 "luiphtite 
 
 bulphotvaiit 
 
 C hloride 
 
 Phospliate 
 
 \rsenatB 
 
 Vii-r 
 
 le's 
 
 0.01%\ 
 
 jp.oa 
 
 As^ObI 
 6.01% \ ( 
 
 Kahlbaum ' 
 Kahlbaum ' 
 
 Hpav\ met.l" 
 [ Nitrite, liquid 
 Oxalate, pure 
 Oxalate c p 
 
 Nonvolatilp matter 
 
 CaU 
 
 Fe 
 
 Nj (flimp tpst) 
 
 liabl6\ \ 
 
 none'. In 10 1,0 
 none / grams / A 
 
 'C.f.A.' 
 
 'C.f.A.' 
 
 .25 cc 
 ..50 cb 
 
 }i lb. 1.50 incl 
 ii'lb. 1.75 '""inci 
 
 M lb. 2.50 incl 
 
 0"!% , 
 001% J 
 0005%' 
 
 Baker .^.nalyzed 
 
 I4 lb. .20 incl 
 
 H lb. .25 incl 
 
 100 grm. .60 incl 
 500 grm. 1.10 incl 
 
 .6.5 cb 
 
 .OS 
 
 H lb. 
 
 ..1.5 
 
 incl 
 
 .38 cc 
 
 m 
 
 
 
 
 ..50 cb 
 
 .OS 
 
 'i lb. 
 
 .20 
 
 incl 
 
 AMMONIUM i 
 
 AMMONIUM Oxalate 
 " Oxalate 
 
 NonvohtUe niittLr l 
 
 Cblondp 
 
 Sul[,hat 
 
 FIaa^ i raetah 
 
 ronton t 
 
 *AMMONIUM Perchlorate 
 * " Perchlorate 
 
 Nonvolatile mattir n 
 Chlorid slight ti 
 
 Sulphate n 
 
 Merck Blue Label 
 
 Oat Guaranteed 
 CI ( Analysis 
 
 Kahlbaum "C.f.A," 
 Kahlbaum "C.f.A." 
 
 gf grams 1' i 
 
 Kahlbaum ' 
 Kahlbaum ' 
 
 'C.f.A.' 
 'C.f.A.' 
 
 Hcj 
 
 'tils 
 
 ;:\™r 
 
 a lb. .30 incl 
 
 100 grill, .60 incl 
 500 grm. 1.50 incl 
 
 10 grm. .70 incl 
 oO grm. 2.00 incl 
 
Baker AnalyKed 
 
 AMMONIUM Persulphate Merck Blue Label 
 
 Noiivolalilu matter, not more than 0.0fifi7%) ^,.„„„,„^ 
 
 f ■lil>„-,d,.s leaa thau 0.002% aa Clf Guaranteed 
 
 H«ivv riii.U,b..DOQe, or at most, a traced Ana'J's's 
 
 AMMONIUM Persulphate Kahlbaum 
 
 " Phosphate, 98% com! 
 
 " Phosphate, c. p., Dibasic 
 
 t(NH,) HPO,] 
 
 .85 cb .08 H !b. .30 incl 
 
 .80 iucl }i lb. .30 incl 
 
 500 grnj. 3.00 incl 
 
 CI 
 
 SO! 
 
 As 
 
 re 
 
 < lO 
 AMMONIUM Phosphate, Dibasic 
 [(NH4) HPp,] 
 \ikahe3 
 
 Arsenic 
 C irboniitea 
 Sulphates 
 Chlondfs 
 
 Baker Analyzed 
 
 - 001% 
 001% > 
 001% I 
 
 Typical 
 
 Merck Blue Label 
 
 Nitn 
 
 Hpavj metala 
 
 AMMONIUM Phosphate 
 " Phosphate 
 
 Nonvolatile m^tt 
 
 Carbonate 
 
 Sulphate 
 
 Chlondu 
 
 Nitrate 
 
 Araecic 
 
 Content 
 
 AMMONIUM Phosphate, c 
 
 (NH4H2PO4) 
 
 \s 
 HNOa 
 
 . _. more than 0,!5% , 
 less than 0.0015%/ 
 
 les^ than 2% CO2 f ^ ,„„■ 
 
 L'.s than 0075% m «n. V Guaranteed 
 less than 0015% a 
 le^ than (10lb% la NjOsl 
 
 I) 
 'fiOsl 
 
 .25 cc .05 
 
 .80 cb .OS }i lb. .30 iiici 
 
 1.2.5 incl }i lb. .40 inci 
 
 Analysis 
 
 s'el In 10 V < 
 ae/ ei"ani3 / Ana 
 
 %' . / 
 
 Kahlbaum "C.f.A.' 
 Kahlbaum "C.f.A.' 
 
 Baker Analyzed 
 
 100 grm. .80 incl 
 500 grm. 2.25 iccl 
 
 H lb. .35 
 
 AMMONIUM Phospho-Moljbdate, c 
 
 " Potassium Phosphate, c 
 
 " Potassium Tartrate, e p 
 
 " Silicofluoride. 1. p 
 
 " Sulphate, coml 
 
 " Sulphate, pure 
 Sulphate, c p 
 
 005% I T^P*."'. 
 0002% i 
 001%) 
 
 2% I A"" 
 
 1%) 
 
 p Baker Analyzed 
 
 CI 
 
 Baker ■inj.lvzed 
 001% 1 
 
 0002% t Typical 
 
 nonej' Analysis 
 0002% ' 
 
 Merck Blue Libel 
 ksi than 017°' \ 
 than 00025% as CI I 
 
 sr N Guaranteed 
 ^ p (^ / Analysis 
 
 A6206i 
 
 N,Oe; 
 
 . . Kahlbaum "C.f.A." 
 Kahlbaum "C.f.A." 
 
 .75 cb .08 
 
 1.50 cb .08 
 
 1.40 cb .08 
 
 .10 cc .05 
 
 .20 cb .08 
 
 .30 cb .OS 
 
 " le'ssthanO 12 
 Ipasth^i Olini' 
 'ra than 005"; 
 ss than O0016 ' 
 
 .\MMONIUM Sulphate 
 
 N „\ I t:l 1 
 Chi nk 
 Heai > n pt iia 
 Sulphociinat 
 Phosph itf 1 
 Vrnenic 
 N.trate" 1 
 
 AMMONIUM Sulphate 
 " Sulphate 
 
 Nonvolatile n 
 Chloride 
 Nitrate 
 PhosphjtL 
 
 Si^I^ho \anit 
 
 Hlji\ m. lal- 
 
 AMMONIUM Sulphide. fHydiosulpbide) 
 
 light 01 dark 
 
 " Sulphide Solution Merck Blue Label 
 
 Arsenic leas than 0.006%\ 
 
 Antimony, leas than 0.000/% I 
 
 Tin less than 0.001.3% I 
 
 Nonvolatile matter, .less than 0.005%^ 
 Ammonium Carbonate 
 
 leas than 0.005% as ' 
 Chloride leas than 0.005% a . , , 
 
 AMMONIUM Sulphite, c. p., crystals Baker Ana yzed 
 
 Sulphocyanate, c. p Baker Analyzed 
 
 Nonvolatile matter 0.015%\ 
 
 Fe 0.0003% ( Typical^ 
 
 '' In 10 \C 
 
 v.' 
 
 100 grm. .5.5 
 500 grm. 1.15 
 
 incl 
 incl 
 
 ..30 gb .15 5 1b. 1.10 gb .25 
 .00 incl I4 lb. .25 incl 
 
 1.00 cb .08 I4 lb. .35 incl 
 
 .65 cb .09 }i lb. .20 incl 
 
 SO3.V.V.;.: 0.001%; 
 
AMMONIUM Sulphocyanate Merck Blue Label 
 
 Nonvolatile matter. ..leas than 0.025%) 
 Substances insoluble in Alcohol, .none 
 
 Sulphates less than 0.01% as SOi 
 
 Heavy metala .none 
 
 Iron 1b33 than 0.0004% 
 
 AMMONIUM Sulphocyanate Kahlbaum "C.f.A." 100 grm. .80 iqcI 
 
 Sulphocyanate Kahlbaum "C.f.A." 500 grm. 2.25 incl 
 
 Nonvolatile matter. . unweighaWe i 1 
 
 o_, ..,..,.. .,__ _, .. Certified 
 
 Solubility in Alcohol — complete f ^ 
 
 suTphate::;.v.:::::::::::::::nonets^^'"^( '^"^"'"'" 
 
 ■"'"--y metals.. ' 
 
 AMMONIUM Tartrate, e. p Baker Analyzed 1.25 cb .08 M lb. .40 incl 
 
 " Tetroxalate, c. p Baker Analyzed 75 cb .OS 
 
 " Thioacetate Solution Merck Blue Label .50 incl 
 
 Nonvolatile matter less than 0.005%"1 
 
 Ammonium Carbonate ( Guaranteed 
 
 less than 0.003% aa (NU,hCO,(' Analysis 
 Sulphates less than 0.0002% as SO] ' 
 
 AMMONIUM Thiocyanate (See Sulphocy- 
 anate). 
 
 " Thiosulphate, c. p Baker Analyzed 1.10 cb .08 }4 lb. .35 incl 
 
 " Vanadate 80 incl 
 
 Zinc Sulphate, c. p 80 cb .08 
 
 .AMYGDALIN 10 grm. .55 incl 
 
 ^AM¥L Acetate, 9-8% (so called absolute) 70 cb .09 
 
 ° " Acetate, (iso), as recommended for 
 use in Photometry for 
 
 Heffner's Standard Lamp, Kahlbaum 2.75 gb .12 
 
 ° " Acetate, tested, for use with Wanner 
 
 Optical Pyrometer Per bottle 2.10 incl 
 
 ° " Nitrite, pure 25 incl 
 
 ANILINE, pure 25 cb .08 
 
 ANILINE Merck Bine Label 80 incl ^^ lb, .30 incl 
 
 Hydrocarbons and Nitrobenzene., none 
 
 ANILINE, c. p., as specially recommended 
 
 for use in microscopy 1.00 cb .08 ■..,.... 
 
 Hydrochloride, c. p 1.00 cb .08 
 
 Sulphate, c. p 1.00 cb .10 
 
 "ANTIFORMIN," a'^ used in staining spu- 
 tum for B tuberculosis 50 incl H lb. .25 incl 
 
 ANTIMONY, met il 25 cc .04 
 
 " metal pov, dcr 30 cc .04 
 
 " metal, gmiular Baker Analyzed 50 cb .06 }4 lb. .20 incl 
 
 Sn noDP 
 
 ANTIMONY, metal 
 
 " Chloride. (TrO, c p 
 
 " Chloride (Penti), c p , fum- 
 
 ing 
 
 Oxide (Tn), c p 
 
 Fe 00l<^c 1 
 
 CI 001%( Typical 
 
 SO) -0001%) Analysis 
 
 Insoluble residue trafe' 
 
 ANTIMONY Oxide (Penta), c p Baker Analyzed 1.00 cb .06 l-i lb. .35 incl 
 
 Oxide (Til) Merck Blue Label .30 incl 
 
 Arsem. loss than 00 15% ) Guaranteed 
 
 Foreign heavy metals none)- .n„|„„i„ 
 
 Chlorides less than 0.05% as CI ) '"'^''^e'" 
 
 ANTIMONY Oxychloride, c. p Baker Analyzed 1.20 cb .06 }i lb. .40 incl 
 
 " Potassium Tartrate, purified, 
 
 ro-^\der 45 cc .05 
 
 " Potassium Tartrate, c p 
 
 powder Baker Analyzed 75 cb .07 '^4 lb. .25 incl 
 
 V J 002% 1 
 
 ri oooi%J 
 
 I OOl*" ' Typical 
 
 I u / Analysis 
 
 C aO 1 \ 
 
 \ con ' 
 
 ANTIMONY Sulphate c p P iker Analyzed 85 cb .OS 
 
 Sulphide (In) c p red Baker Analyzed 1.50 cb .09 M lb. ..50 incl 
 
 IS. 
 
 
 
 
 Kahlbaum 
 
 Baker Analyzed .1 
 
 100 grm. 
 
 15 incl 1.30 gb .15 U lb. 
 
 1.10 
 .40 
 
 incl 
 incl 
 
 
 
 .45 
 .35 
 
 
 Baker Analyzed 
 
 1.00 cb .06 14 lb. 
 
 incl 
 
 Sulphide (Penta), i, p,, yel- 
 
 1,00 cb ,09 
 1,00 cb ,08 
 
T Brand 
 
 ARABINOSE 
 
 ARGOLS (Potassium Bitartrate, crude) 
 
 ARSENIC, metal, lump 
 
 I" Chloride (Tri), pure liquid 
 
 Sulphide, yellow (Orpimeot) 
 
 " Sulphide, red 
 
 " Trioxide (Arsenious Acid), lump 
 
 or powdered Merck Blue Label 
 
 Nonvolatile matter iu^a than 0,05%1 
 
 Barium Sulphate, Talcum, Calcium [ Guaranteed 
 
 Sulphate, etu nme/ Analysis 
 
 Arsenic Sulphide ..less than 0,0005'ii jo S' 
 
 ARSENIC Trisulphide, c. p 
 
 ASBESTOS, wool, clean for filtprmg 
 
 " Italian, short fibre 
 
 " Italian, short fibre, washed in 
 
 acid 
 
 " Italian, short fibre, washed 
 
 an d ignited 
 
 " Special for Gooch crucibles. 
 This is short fibre suitable 
 for rapid filtering and con- 
 tains a trace of iron 
 
 " Italian, long fibre 
 
 " Italian, long fibre, washed in 
 
 acid 
 
 " extra long fibre, selected, 
 
 white 
 
 " for Gooch crucibles Kahlbaum 
 
 platinized 5% 
 
 ASPARAGIN 
 
 ASPHALTUM 
 
 A20LITMIN 
 
 AZOUTMIN 
 
 .10 cc .04 
 .45 cc .05 
 
 .25 cc .05 
 .25 cc .05 
 
 1.00 cb .07 
 M incl 
 2.00 inci 
 
 2.50 inc! 
 
 2.75 incl 
 
 .25 incl 2.50 
 2.50 
 
 i..50 
 3.50 
 
 .75 incl 
 
 4.50 incl 
 
 1.00 cb .04 
 
 .10 cb .03 .25 cb 
 
 inci 
 incl 
 incl 
 
 AZOLITMIN 
 
 Kahlbaum 
 
 Kahlbaum 
 
 Kahlbaum 
 
 Merck Blue Label 
 
 Merck Blue Label 
 
 Tested for sensitiveness 
 
 BALSAM, Canada (See Microscopic 
 
 Mounting Media, Section II). 
 
 BARIUM Acetate, c, p Baker Analyzed 
 
 C! -0.003%f 
 
 CaO -0,001%^ Analysis 
 
 SOs 0.001%l An^'l'S'S 
 
 Typical 
 
 BARIUM Acetate Merck Blue Label 
 
 Chlorides less than 0,002% as CI i 
 
 Caldumandalkalies-uotmorethaa 0.08%t Guaranteed 
 
 Heavy metala none ( Analysis 
 
 Nitrates less than 0.0032% as Ni^Os ' 
 
 Kahlbaum "C.f.A." 
 Kahlbaum "C.f.A." 
 
 Baker Analyzed 
 
 BARIUM Acetate 
 
 " Acetate 
 
 Nonvolatile alkalies present after i 
 precipitatingBariuni...l.95mgf j^ [q 
 
 Nitrate ^Jnl!!; gf^'"' 
 
 Chloride. nooel 
 
 Heavy metals none ' 
 
 BARIUM Borate 
 
 " Carbonate, native, powdered 
 
 (Witherite) 
 
 " Carbonate, precipitated, pure, 
 
 white 
 
 Carbonate, c. p Baker Analyzed 
 
 Fe 0.001%j 
 
 Cl "■ 0.001%l Typical 
 
 Na' (flame test) ^'H^E? ( *"='>'®'^ 
 
 CaO 0-005%.' 
 
 BARIUM Carbonate Merck Blue Label 
 
 Tested for solubility in Hydi 
 Barium Hydroxide. . .aot moi 
 Caioiuij and alkalies. . not m( 
 
 Heavy metals. ;.:-;^-"'^'J^,l "'""""= 
 
 Chlorides less than 0.000o% as CI \ 
 
 Nitrates less than 0,0032% as UiOi! 
 
 BARIUM Carbonate, precipitated Kahlbaum 
 
 15 
 
 M lb. .20 
 
 5 grm. .50 
 5 grm. .70 
 10 grm. 1.30 
 25 grm. 3.00 
 H oz. 1.75 
 Vs oz- ..50 
 
 .80 cb .12 
 .15 cc .04 
 
 incl 
 incl 
 incl 
 incl 
 incl 
 incl 
 
 cb .OS U lb. .30 incl 
 
 100 grm. .80 incl 
 500 grm. 2.25 incl 
 
 Dchloric Acid'i 
 e than 0.223% | 
 re thanO,OG%'. 
 
 Guaranteed 
 
 "Ct-A." 
 
 H lb. .22 incl 
 
 'A lb. .70 incl 
 
 100 grm. .75 incl 
 
'. Carbonate, precipitated 
 
 Heavy metals none 
 
 Insoluble io Hydroclibric Acid, .none 
 Noavolatile reaiduo present after 
 
 precipitating Barium U mg.^ grams 
 
 Chloride 1 
 
 Nitrate 
 
 '. Chloride, crystals 
 
 Chloride, pure 
 Chloride, c p 
 
 Kahlbaum "C.f.A.' 
 
 (CerdBi 
 Analysi 
 
 Baker Analyzed 
 
 Ounce and pound pi 
 
 Pries in alhoc siia pacliagBa 
 
 onl. per lb. conl. size pkg, per pkg. Cont, 
 
 500 grm. 1.80 incl 
 
 .10 cc .04 
 
 .12 cb .07 
 
 .25 cb .07 H lb. .15 incl 
 
 BARIUM 
 BARIUM 
 
 Na (fl; 
 
 Chloride, 
 
 3t) 
 
 Baker Analyzed 
 I Typical 
 I Analysis 
 
 Merck Blue Label 
 
 Guaranteed 
 
 pecial 
 
 Fe trace I 
 
 CaO 1 
 
 Chloride 
 
 Alkalies not more than 0,03 
 
 Strontium and Calcium Chlorides 
 
 less than 0.025% s 
 
 Heavy metals none/ Analysis 
 
 Nitrates less than 0.0032% as NaOsl 
 
 Chlorates leas than 0.025% as CbOi" 
 
 [ Chloride Kahlbaum "C.f.A.' 
 
 Chloride Kahlbaum "C.f.A.' 
 
 Alkaline residue present after 
 precipitatine Barium . 
 
 ^i*"^^ =^""^1 inlO I Certified 
 
 itrori^mandCafciumCbio^Xj ^^-^f '^■""^^'^ 
 Heavy metals none 
 
 [ Chloride, c. p., anhydrous 
 
 Chromate, c. p 
 
 Dioxide (See Peroxide). 
 
 Fluoride, c. p Baker Analyzed 
 
 Hydroxide, pure, crystals 
 
 Hydroxide, c, p.. crystals Baker Analyzed 
 
 CaU . . -o.ooi%-i 
 
 Fe 0.0004%i 
 
 CI 0.0003% l_ Typical 
 
 Iter , 
 
 ■■^n^,fe I 
 
 .;noneV''inC 
 
 Baker Analyzed 
 
 Hydroxide 
 
 Chlorides ....less than 0.01 
 
 Calcium and alkaUea 
 
 e than 0.667% ■ 
 
 Merck Blue T-abel 
 
 Analysi! 
 
 Heavy metals none I 
 
 Sulphides leas than 0.0027% as St 
 
 [ Hydroxide, c. p., anhydrous .... Baker Analyzed 
 Hydroxide, Solution, 3.3% Merck Blue Label 
 
 Chlorides less than 0.0005% as CI j 
 
 Calcium and alkalies _, „ „„„. f Guaranteed 
 
 not more than 0.667%, ■ inalvaia 
 Heavy metals _ __ ^_^ nonet '^"^'*^*'^ 
 
 "BARIUM 
 BARIUM 
 
 Sulphides leas than 01 
 
 [ Hydroxide, alkah free 
 Hydroxide, alkali Iree 
 
 Alkaliea nor 
 
 Ch onde flint trat 
 
 Sulphide noE 
 
 Heav^ metah nor 
 
 Content found 100 5' 
 
 : Nitrate, powder 
 Nitrate, c p 
 
 CI 
 
 CaO 
 
 Fe 
 
 Na (flame teat) 
 
 Sr 
 
 Nitrate 
 
 Chlondo'' le« thftn 00( 
 
 Alkdhes not more thai 
 
 Heav metala 
 
 Oxalate, c p 
 Oxide, L p h\drated 
 Peroxide fDioxide) 
 Peroxide, c p 
 
 Ea ) 
 I" 
 
 Kahlbaum "C.f.A.' 
 
 Kahlbaum "C.f.A.' 
 
 001"; 1 
 001"; / 
 
 001% 
 
 iker Analyzed 
 
 Merck Blue Label 
 
 Baker Analyzed 
 Baker Analyzed 
 
 89% I 
 050% I 
 
 020 „ 1 ■ , . 
 OOOl'"! Analysis 
 
 Baker Analyzed 
 Typical 
 
 .40 cb .07 i^lb. .15 ind 
 
 .40 incl }4 lb. .20 incl 
 
 100 grm. .50 incl 
 500 grm. .90 incl 
 
 .50 cb .07 
 
 .80 cb .07 l^lb. .35 incl 
 
 .85 cb .07 
 
 .25 cb .08 
 
 .35 cb .08 H lb. .15 incl 
 
 .60 incl I4 lb. .25 incl 
 
 .60 cb ,06 I4 lb. .22 incl 
 
 ,50 incl 
 
 100 grm. .55 incl 
 500 grm, 1.00 incl 
 
 .15 cc .04 
 
 .30 cb ,06 }i lb, .17 incl 
 
 .50 incl I4 lb. .20 incl 
 
 .90 cb .09 
 
 .60 cb .06 
 
 .30 cc .04 
 
 .60 cb .06 i-i lb. .22 
 
 *BARIUM Peroxide tpst ! ^e^(rent 
 
 Merck Blue Label 
 16 
 
 .65 incl I4 lb. 
 
*BAR!UM Peroxide, c. p., hydrated. . 
 
 -0.001% (^ 1 
 
 Maker or Brand 
 
 Baker Analyzed 
 
 BARIUM Phosphate, c. p Raker Analyzed 
 
 " Sulphate, comi 
 
 " Sulphate, c. p., powdered Baker Analyzed 
 
 " Sulphide, pure Baker AnalvKf<l 
 
 CI 0,010%) 
 
 CaO 0,001%/ T . , 
 
 Fe 0.0003%> T''"',''"'- 
 
 FreeS preaant Analyms 
 
 As trace! 
 
 BARIUM Sulphide Merck Blue Label 
 
 -\rse[iir leas than 0.0001% 
 
 BARIUM Sulphite, c. p 
 
 " Tartrate, c. p Baker Analyzed 
 
 " Thiosulphate, c. p. (for stand- 
 ardizing) Baker Special 
 
 BEEF Extract, for preparation of culture 
 
 media Licbig's 
 
 BENZALDEHYDE fEssential Oil of Al- 
 monds) 
 
 "BENZENE (Benzol) 507o water white 
 
 " (Benzol) 50% water whitie 
 
 ° " (Benzol) 50% water white 
 
 (Benzol) 90% water white 
 
 ' " (Benzol) 90% water white 
 
 " (Benzol) 90% water white 
 
 "BENZENE (Benzol) c, p., crystal liz able, 
 
 water white 
 
 " " (Benzol) c. p., crystallizable, 
 
 water white 
 
 ° " (Benzol) c p crvstallizable, 
 
 \\ater white 
 
 (Benzol), 
 
 Sp gr 
 
 C p 
 
 Baker Analyzed 
 
 4°C ( 
 
 a than 0( 
 
 1.00 
 
 Thiopheue 
 "BENZENE fBenzol) 
 
 Thiophyne 
 TarboT Diiulphiiw 
 
 BENZIDINE 
 
 Sulphates les-^ than 0,0125% ai 
 
 Nonvolatile matter less than 0,05% ( Analysis 
 
 BENZIDINE, for Blood Test Merck Blue Label I.OO 
 
 Tested for suitability for blood detection 
 
 •BENZIN (Naphtha) 
 
 °BENZIN (Petroleum Ether) Merck Blue Label .... 
 
 NoM\'olii,tile matter and heavy oils ., 
 
 Merck Blue Label 
 
 e I Guaranteed 
 "o I Analfaia 
 
 Merck Blue Label 
 3 SO) I Guaranteed 
 
 Aci'l 
 
 Suljihiir compounds and reducing 
 
 BENZOYL Chloride 
 BENZYL-CHLORIDE, pure 
 BERLIN Blue (See Injecting Media) 
 "BERYLLIUM Nitrate, i- p cribtals 
 BISMUTH, metnl 
 BISMUTH, met il 
 
 ! Guaranleed 
 r Analysis 
 
 Baker \nil\zed 
 
 1.65 cb .0,? 
 
 .13 cc .05 
 
 .30 cb .07 
 
 .6.5 cb .07 
 
 .75 cb .07 
 2.00 cb .08 
 
 .15 cb .0.S 
 .50 incl 
 
 ■ 1 75 |.b lo 
 65 gb 12 
 
 2 75 cc 04 
 1 3 00 mcl 
 
 H lb. .20 
 
 I4 lb 
 
 ;»' lb 
 
 1 pt. 
 
 Igal 
 .5 gal, 
 1 pt. 
 
 5 gal. 
 
 1 pt. 
 
 1 gal 
 
 5 gal 
 
 .35 
 
 ucl 
 
 .90 
 
 nrl 
 
 .10 cb 
 
 .OR 
 
 .75 on 
 
 .'25 
 
 2.75 en 
 
 .511 
 
 .15 cb 
 
 .OH 
 
 .90 en 
 
 .■25 
 
 3.25 en 
 
 .50 
 
 .17 cb 
 
 .08 
 
 1 .00 en 
 
 .25 
 
 3.75 en 
 
 ..50 
 
 }i oz. .35 incl 
 1 gal. .40 en .25 
 
 U lb 1 00 
 
 BISMUTH, met il, t p , sticks 
 
 Carbonate, c. p Baker Analyzed 
 
 " Chloride, c. p Baker Analyzed 
 
 1 Typical 
 
 SO, . . 0.001% ( Analysis 
 As. .'.■.■..'.' trace.' 
 
 Hydroxide, c. p Baker Analyzed 
 
 Nitrate, c. p Baker Analyzed 
 
 Oxide, c. p Baker Analyzed 
 
 Oxychloride, c. p Baker Analyzed 
 
 Subgaliate, pure 
 
 Subnitrate, pure powder 
 
 1 4.25 cb 
 1 4.25 gb 
 
 incl 
 incl 
 
 4.25 cb 
 3.00 gb 
 5.00 cb 
 4.25 cb 
 3.00 cb 
 2.25- 
 
 >4 lb. 1..50 incl 
 }i lb. 1.50 incl 
 
 li lb. 1.50 incl 
 H lb. 1.00 incl 
 JClb. 1.75 incl 
 
 17 
 
BISMUTH Subnitrate, c. p Baker Analyzed .40 incl 3.75 cb .06 K !b. 1.25 
 
 CA 0.005%"1 
 
 SOs none! Typical 
 
 Pb Donoj' Analysis 
 
 As cone' 
 
 Merck Blue Label .30 infl 'A lb. 1-75 
 
 Lead leas than 0,105% \ 
 
 Copper leaa thaa 0.01% i 
 
 Salts of the alkalies.... leaa than 0.25% ( r,„arantpfd 
 
 Chlorides less than 0.01% aa 6l , ^ "'^"{'^ **' 
 
 Ammonia. . . .less than 0.0035% aa NHji *"aiysi8 
 
 Sulphates less than 1.5% aa SOA 
 
 Residue on ignition 79-[>2% J 
 
 Arsenic, .less than O.Oiir;'/ 
 
 BISMUTH and Potassium Iodide Solution, 
 
 tested reagent Merck Blue Label .30 incl ,'4 lb. .90 incl 
 
 " Tetraoxide, c.p.,freefromMn. Baker Analyzed .60 incl 6.00 cb .07 M lb. 2.00 incl 
 BLEACHING Powder (Calcium Hypochlo- 
 rite) (Oxychloride) lean .10 mcl 
 
 Powder 101b. .60 incl 
 
 BONE ASH, best quality for cupels 10 cc .05 
 
 BORAX (See Sodium Borate) 
 
 BRAZILWOOD 20 incl 
 
 "BROMINE, U. S. P 25 incl 1.00 incl K lb. .35 incl 
 
 U. S. P i^lb. .60 incl 
 
 ■'BROMINE, c. p Baker Analyzed .20 gb .15 .85 gb .20 14 lb. .30 gb .15 
 
 c. p Mlb. .50gb .15 
 
 Cl trace 
 
 "BROMINE Merck Blue Label .30 incl J-^ lb. 1.00 mcl 
 
 Nonvolatile matter less than 0.01% I 
 
 Sulphuric Acid, .less than 0.005% aa SOif Guaranteed 
 Organic Bromine compounds (Biomo-i- .„.i.-:- 
 form and Carbon Tetrabromide) . .none \ ^'^^'^^^ 
 Iodine less than 0.75% ' 
 
 "BROMINE Water, 3% Merck Blue Label 60 incl 
 
 Sulphuric .A.cid . teas than 0.00002% as SOi I Guaranteed 
 
 Tested for Erominecontent I Anairsig 
 
 BRUCINE Merck Blue Label 3-8 oz. .30 incl 
 
 Water of crystallization^ ^^^ ^^^^^ ^ ^^^ ) Guaranteed 
 Nitric acid le^s t^n 0.05% NjO" ( ^""Ij's's 
 
 CADMIUM metal, powder 3.00 incl 
 
 " metal, sheets 3.75 incl 
 
 " metal, sticks, gran, and mossy 1.75 incl 34 lb. .60 incl 
 
 CADMIUM Acetate, c.p Baker Analyzed 2.50 cb .07 
 
 " Borotungstate Solution, sp. gr. 
 
 3.28, tested reagent Merck Blue Label .80 incl 34 oz. .30 incl 
 
 Bromide, c. p 2.00 cb .07 H lb. .65 incl 
 
 " Carbonate, c. p Baker Analyzed 2.50 cb .07 }4 lb. .75 incl 
 
 " Chloride, c. p., crystals Baker Analyzed .20 incl 1.85 cb .07 }4 lb. .60 incl 
 
 Zn nonei 
 
 SOi 0.001%,( Typical 
 
 Fe 0.001% ( Analysis 
 
 As none,' 
 
 CADMIUM Chloride, c. p., anhydrous 2.25 cb .06 341b. .60 inc! 
 
 Hydroxide, c.p Baker Analyzed 4.00 cb .09 }4 lb. 1.25 incl 
 
 " Iodide, c.p 5.50 cb .07 M lb. 1.60 incl 
 
 ° " Nitrate, c. p Baker Analyzed .20 incl 1.85 cb .07 34 lb. .65 incl 
 
 " Oxide, e. p Baker Analyzed 4.00 cb .07 H lb- 1-25 incl 
 
 " Potassium Iodide Merck Blue Label .80 incl 34 oz. .30 incl 
 
 Foreign metals.. . .none) Guaranteed 
 
 Sulphates leaa than 0.01% as SOi^ Annivsis 
 
 Iodic Acid .less than 0,00125% as HIOi\ '^'""J^sis 
 
 CADMIUlVl Sulphate, c. p Baker Analyzed 1.85 cb .07 3^ lb. .65 incl 
 
 Sulphide, c. p Baker Analyzed 2.75 cb .08 Ji lb- .90 incl 
 
 •CALCIUM, electrolytic Kahlbaum 100 grm, I.OO incl 
 
 Acetate, purified 70 cb .09 
 
 " Acetate, c. p Baker Analyzed 75 cb .10 34 lb. .25 incl 
 
 "- '"-- etest) . 
 
 SOi 0,010%/ 
 
 Typical 
 
 Analysis 
 
 . 0.001% 
 
 Fe 0.001%ot 
 
 MgO 0.001%) 
 
 CALCIUM Arsenate, c. p 1.50 cb .08 }i lb. .45 incl 
 
 " Arsenite, c. p 1-50 cb .08 H lb. .45 incl 
 
 " Bisulphite, c. p., solution 35 cb .08 
 
 * " Carbide, lump 20 incl 10 lb. 1.75 incl 
 
 " Carbonate, precipitated 10 cc .05 
 
 " Carbonate, lump (Marble) 10 cc .04 
 
 " Carbonate, pure 40 cb .08 
 
 18 
 
H O M A 
 
 Maker or BraiiJ 
 
 Carbonate, c. p Baker Analyze.J 
 
 J«'V> 0,0005%) 
 
 Na,K nonef ^ 
 
 CI :::::::::r6,ooo2%'- V^'r^'- 
 
 MeO 0.005%L Analysis 
 
 Nitrafo trace' 
 
 Carbonate, precipitated Merck Blue Label 
 
 Tettoil for Solubilitv in Hv-, 
 
 (iroi^liloric, Nitric and Acetic Acidal 
 
 jund pricfls Price in otlier size paokase? 
 
 Del lb. cuiil. size pkg. per pkg. cant. 
 
 .60 cb .08 M lb. .22 incl 
 
 1.00 iuol 3i lb. .35 int. 
 
 i as P2O6I 
 .an 0.02%^ 
 
 I 
 
 ■ .CM i 
 
 g /grams / f 
 
 if ^ 
 
 CALCIUM 
 CALCIUM 
 
 MaKnciiuiii |p3s than 0.002%f 
 
 Sii![iliiiics less than 0.0125% S 
 
 Cliltjridea less than 0,0005% 
 
 Phosiihatos. . . .less than 0.001% a 
 Alkalies and Calcium Oxide 
 
 iiot more than 0.02%-^ 
 
 Carbonate, precipitated Kahlbaum "C.f.A.' 
 
 Carbonate, precipitated Kahlbaum "C,f .A.' 
 
 Magiieaium 
 
 Caustic Potasll.. 
 Sulphate and phosphate . 
 
 Chloride... noneV in 10 V Certified 
 
 Soluble alkali 7.5 mg /grams/ AnalTsis 
 
 Solubility in dilute Acetic Acid i 
 
 Heavy metals none,/ 
 
 Carbonate, c. p., for standard- 
 izing Balder Special 
 
 Carbonate, (Iceland Spar) for 
 
 standardizing 
 
 Chloride, granular, purified 
 
 Chloride, pure, lump or granu- 
 lar, anhydrous 
 
 Chloride, c. p., anhydrous for 
 
 diying tubes 4 S and 12 mesh. Baker Analyzed 
 
 Fe 001 i j 
 
 F^U no^ll^"'-'. 
 
 Me J 005% L A"='s's's 
 
 suj 001%! 
 
 Chloride dr\ granulated 
 
 Neiitr.il]ty..., less than 0,0028% as CaO 
 Arsenic less than 0.0002% 
 
 100 grm. .75 
 500 grm. 1.60 
 
 incl 4..50 incl 
 .20 cb .09 
 
 Merck Blue Label 
 
 Guaranteed 
 Anatyeis 
 
 Chloride, c. p., crystals Baker Analyzed 
 
 Fe 0.001%f 
 
 MgO 0.001%l 
 
 SOj 0.001%' 
 
 CALCIUM Chloride, crystals 
 
 Substances insoluble in Absolute Alcohol, 
 
 Heavy metals 
 
 Sulphates less than 0.0038% 1 
 
 Ammonium salts leas than 0.00175% a; 
 
 Barium less than C 
 
 Arsenic leas than 0. 
 
 Nitrates less than 0.0032% as 
 
 CALCIUM Chloride, fused, tested reagent 
 
 " Chloride, anhydrous, sticks, . . 
 
 " Chromate, c. p 
 
 " Fluoride, native, powder 
 
 " Fluoride, c p 
 
 " Formate, <. p 
 
 " Hydroxide, pure 
 
 " Hydroxide 
 
 Carbonates I n 1 
 
 Silica ' 
 
 Alumina 
 
 Sulphates lea ^ 
 
 Chlnrldeg le" ' 
 
 CALCIUM Hypochlorite (Blt-uhiug 1 3^ 
 der) (0\\ chloride) 
 
 " Hypochlorite 
 
 " Hypochlorite, c. p., (Oxychlo- 
 
 ride) 
 
 CALCIUM Lactate 
 
 " " Nitrate, pure 
 
 Nitrate, c. p 
 
 Typical 
 
 Merck Blue Label 
 
 N2O/ 
 
 Merck Blue Label 
 
 Baker Analyzed 
 Baker Analyzed 
 Baker Analyzed 
 Merck Blue Label 
 
 .25 cb 
 .50 cb 
 
 .50 cb 
 
 . 1.25 cb 
 
 . .10 cc 
 
 1.00 cb 
 
 2.00 cb 
 
 .40 cb 
 
 .GO 
 
 Fe . 
 
 001%) 
 
 O.Q02%l. ' 
 
 6001%' 
 
 Baker Analyzed 
 
 CALCIUM Oxalate, c. p 
 
 " Oxide (Caustic Lime).. 
 
 Baker .Analyzed 
 19 
 
 55 cb .08 
 
 .10 cb .03 .70 cb .09 
 
 80 cc .05 
 
 .15 incl .90 cb .08 
 
 1.40 cb .OS 
 .10 cc .0.5 
 
 h'lb. ..35 
 >i lb. 1.40 
 
 .45 incl 
 
 .35 cb .OS }i lb. .18 incl 
 
 h' lb. 
 
 ■ ■ I'i lb'. 
 
 Hlb. 
 Mlb. 
 
 ,'4 lb. 
 
 H lb. .25 
 
ART 
 
 H 
 
 U R 
 
 H 
 
 T H M 
 
 A 
 
 S 
 
 COM 
 
 PAN 
 
 Y 
 
 
 Oxide, 
 
 Mg 
 
 r 
 
 0\ide 
 Oxide 
 
 h 
 
 from Marble 
 
 t o Marble 
 fro Mirl le 
 
 
 Maker or Et-aiiil 
 
 Baker Analyzed 
 I50%\ 
 500% i 
 200% 1, Typical 
 4%; Analysis 
 6%l 
 5%.' 
 
 . . Kablbaum 
 
 . . Merck Blue Label 
 5 CO,i 
 
 a" 5" Tn Guaranteed 
 
 
 Ounce and 
 
 pound fjricea Pi 
 
 ■Ice in other size pack. 
 
 iflCS 
 
 CALCIUM 
 
 PC, 
 
 ■oz. ..nl. 
 
 per lb. cunt. si 
 
 .25 cb .07 ,. 
 
 ..W ch .10 ., 
 .60 incl 
 
 ze pkg. per pkg. 
 
 cont. 
 
 CALCIl M 
 
 
 
 'i:^lb. .25 
 
 
 
 
 
 
 a SO, I 
 
 
 L H d och o 
 
 Kahlbaum "C.f.A.' 
 Kahlbaum "C.f.A.' 
 
 ea than 03"" 
 eaa than 00 " 
 
 : <)\ide 
 0\ide 
 
 o ub n ±1 a ocn o c 1 
 
 Acid complete i , 
 
 Sulphate and Phosphate nonel In 10 V Certifid 
 
 Silicates none/ grams 1 Analysis 
 
 Iron and Alumina none! I 
 
 Chlorides .trace/ ' 
 
 Oxide, from Iceland Spar Merck Blue Label 
 
 Oxide, from Iceland Spar Merck Blue Label 
 
 Carbonales less than 0.7% CO-'i 
 
 Silica none! 
 
 Sulphates less than 0,017% as ^I'h' Guaranteed 
 
 Chlorides less than 0.00015% as CI / Analysis 
 
 Phosphates less than 0,0033'::o P:Osi 
 
 Iron less than 0.01%' 
 
 Phosphate, c. p., dibasic 
 
 (CaHP04 + 2H.0) 
 
 Phosphate, dibasic (CaHP04 + 
 
 2H,0) Merck Blue Label 
 
 Arsenic less than 0.0005% 1 
 
 Chlorides less than 0.002% aa CI f f- , .. 
 
 Heavy iHcUls none ^ Guaranteed 
 
 Sulphates .... less than 0.0075% aa SOjt '^"""'sia 
 Residue on ignition ,. 74-75%' 
 
 Phosphate, dibasic (CaHP04 + 
 
 SH^O) Kahlbaum "C.f.A." 
 
 Phosphate, dibasic Kahlbaum "C.f.A." 
 
 Residue oiMgnitLon,. 74.95%1 j 
 
 sXhatc::::::::;;:;::;:none' 1°'° [certified 
 
 Chloride nonel ^''^'"^ I Analysis 
 
 Hea^T metals none ! I 
 
 Phosphate, c. p., monobasic 
 
 [CafH^PO.). + H2O] 
 
 Phosphate, monobasic 
 
 [( 'aaf.PO*). + HbO] Merck Blue Label 
 
 .\r-r:n,- leaa than 0.0005%! 
 
 '"■|d.>ri<-|o.- less than 0,002% as CI ( Guaranlccd 
 
 Sulphate^ . , ..less than 0.0875% aa SOs/ Analysis 
 ll(';n-y metals none/ 
 
 Phosphate, precipitated (con- 
 tains about 96% Calcium Phos- 
 phate tribasic) 
 
 Phosphate, e. p., tribasic [Cas 
 
 (PO.,),] 
 
 Phosphate, trihn^-ir Tn /I'O > ,] Men 
 
 50 grni. 1.20 incl 
 100 grm. 2.05 incl 
 
 J-g oz. .40 incl 
 lioz. 1.25 incl 
 
 .75 c-b .08 M lb. .25 incl 
 
 1.00 incl Klb. .35 incl 
 
 50 grm. .80 incl 
 100 grm. 1.25 incl 
 
 1.00 cb ,0.S h'lb. .35 incl 
 1.25 incl h' lb. .40 incl 
 
 e Blue Label 
 
 .90 cb .12 lilb. .35 incl 
 i2lb. 1.00 inc! 
 
 CALCIUM Phosphate, tribasic [Caa(P04)d Kahlbaum "C.f.A.' 
 Phosphate, tribasic [Cas^POOa] Kahlbaum "C.f.A."' 
 
 |g( gramu T 
 
 
 Sulphate 
 
 C;.rl,onate 
 
 Arsenic 
 
 Ileavj- metals 
 
 CALCIUM Sulphate, calcined (Plaster of 
 
 Paris) 
 
 " Sulphate, native, (Gypsum) 
 
 " Sulphate, c. p Baker Analyzed 
 
 !■> 0,001% ■< 
 
 "''" :;::::.;:; S:SS T't^ 
 
 trace t *"^'ysis 
 ,',",'.',".'.'.*,',','.'.'."-fl,'001%l 
 
 CALCIUM Sulphate Merck Blue Labe! 
 
 Iron [f!3n than 0,00375% 1 Guaranlced 
 
 Magnesium and alkalies.. not more than 0.1% t Analysis 
 
 CALCIUM Sulphate Kahlbaum "C.f.A,' 
 
 20 
 
 AlgU.. 
 
 50 grm. .90 incl 
 100 grm. 1.40 inc! 
 
 .10 cc .05 
 .10 cc .05 
 .40 cb .09 
 
 1.00 incl J.ilb. .35 incl 
 100 grm. .65 incl 
 
Maker or Brand 
 
 Kahibauiii "CJ.A.' 
 
 lalyels 
 
 CALCIUM Sulphate 
 
 Iroii U\i(le „_ 
 
 Alkalies and Maguesia present ( In 10 ( 
 
 aftoc precipitating Calcium Smg./" grams / 
 
 Magnesia trace' ' 
 
 CALCIUM Sulphide, pure ' 
 
 Sulphide, cubes, according to 
 Professor Otto 
 
 Sulphide Merck Blue Label 
 
 Arsenir, less tlian 0,0001'% 
 
 CALCIUM Sulphite, e. p.. Baker Analyzed 
 
 ^ . X, .'U ^Tartrate, c. p Baker Analyzed 
 
 CANADA Balsam (See Microscopic Mount- 
 ing Media) 
 
 CAMPHOR, refined 
 
 *CARBON Bisulphide, coml. (also furnish- 
 ed in 25, 50, 100 and 500 lb. cans, 
 and 10001b. drums. Price on ap- 
 plication). . , ,, 
 
 ■'CARBON Bisulphide, c. p Baker Analyzed 
 
 Sp.gr 1.27%i 
 
 ■'■•^ «-,S™(™»i 
 
 if lb. conl. ihe pkg. per pkg. cont, 
 500 grm. 1.80 incl 
 
 .75 jg .07 
 
 1.00 incl M lb. .35 inct 
 
 .50 cb .08 '.lib. .20 incl 
 
 1.50 cb .08 
 
 1.00 cc .04 
 
 .28 en .07 5 1b. 1.15 en .12 
 .40 cb .08 
 
 . —0.001% 
 
 
 Merck Blue Isabel 
 
 Baker Analyzed 
 
 Free Sulphur 
 
 Nonvolatile matter , 
 
 'CARBON Bisulphide 
 
 Nonvolatile matt«r loss than 0.0008%"i 
 
 Hydrogen Sulphide and foreign organic ( 
 
 Sulphur Gonipouuds nonej 
 
 Sulphuric and Sulphurous Acida . . , none ' 
 
 CARBON Dioxide, supplied in seamless 
 
 steel cylinders containing 20 
 
 lbs. each 
 
 Cylinders purchased from us 
 
 will be refilled at $3 00 each. 
 " Tetrachloride, coml. . 
 " Tetrachloride, pure.. 
 " Tetrachloride, c. p.. 
 
 Sp. gr l,629i 
 
 F„roh,.™v,;:::::;::::;:;;:::.;SS(i'pr' 
 
 H"S noncL """'ysis 
 
 Nonvolatile matter b. 0004% I 
 
 CARBON Tetrachloride Merck Blue Label 
 
 Nonvolatile matter less than 0.00125% , 
 
 Chlorine less than 0.0002% J 
 
 Hydrochloric Acid less than 0.0001% as Cll Guaranleed 
 
 Organic matter none/ Analysis 
 
 Aldehyde none \ 
 
 Carbon Diaulphide. less than 0.02% ' 
 
 CARBORUNDUM, powder, 40, 60, 80, 100 
 
 and 180 mesh 
 
 CARD TEETH 
 
 CARMINE, No. 40 
 
 CARMINE Merck Bl 
 
 Tested for ., .proper solubility / OiTnrHiii..pH 
 
 Water not more than 25% \ V ""," ■'* ^^ 
 
 Ash not more than 8% \ *"^'J^sis 
 
 CARMINE-Fibrin, tested reagent Merck Blue Label 
 
 CASEIN, from milk, washed 
 
 " according to Hammarstein 
 
 CASEIN-Sodium (Nutrose), in original 
 
 containers 
 
 °CELLOIDIN shreds Schering 
 
 CEMENT, Gutta Percha, for sealing mu- 
 seum jars 
 
 " Gutta Percha, for sealing mu- 
 seum jars 
 
 CERESINE, black 
 
 " white 
 
 " yellow 
 
 'CERIUM Nitrate, granular 
 
 ° " Nitrate, c. p 
 
 " Oxalate, pure 
 
 'CHARCOAL, animal, granular 
 
 " " animal, powder 
 
 ° " animal, purified 
 
 ° " animal, treated with acid, 
 
 and washed, moist 
 
 ° " animal, c. p., dry 
 
 21 
 
 .30 cb .08 
 .70 cb .08 
 
 t lb. .20 incl 
 
 per cyl, 18.00 incl 
 5 II-. 1.00 en .12 
 
 .15 incl 
 .35 cb .04 4.50 cb .10 
 
 Label .80 incl 
 
 .50 incl 
 .40 eb .03 
 
 100 gnu. .SO inel 
 
 500 grm 4.50 inel 
 
 25 incl 
 
 30 incl 
 
 2-> incl 
 
 .20 cb .04 2.00 cb .08 
 
 .75 inel 
 
 40 cb .09 
 
 10 incl 
 
 10 cc .05 
 
 .35 cb .09 
 
 .50 
 
 I lb. .25 incl 
 
 112. .30 incl 
 
 i oz- .20 incl 
 
Merck Blue Label 
 
 Merck Blue Label 
 
 thau Oi^o 
 than 1% 
 
 not moTQ than U 1% \ 
 is than 05% aa SOb J 
 ess than 01% as CI I 
 ihan 016% aa NsOJ 
 less than 00''% ^ 
 lesa than 02% I 
 jsa than 025'" \ 
 more than lO'^c 1 
 lan 001%aab/ 
 
 Guaranteed 
 Analysis 
 
 "CHARCOAL, animal, c, p., powdered.... 
 
 "CHARCOAL, animal, tested reagent 
 
 "CHARCOAL, blood, c. p 
 
 ^CHARCOAL, blood, purified by acid 
 
 Mat«ndl soluhlo m Water not nii 
 Material Bolutile in Alcohol 
 Sulphates le' 
 
 Chlorides I 
 
 Nitrates leas 
 
 Copper 
 
 Calcium 
 
 Residue on ignition 
 H\ droKen Sulphl.de 
 TwHted fir 
 ^CHARCOAL, from sugar c p 
 " " «ood powder 
 
 " \\ood lumps 
 
 CHLORAL Hjdrate crystals 
 CHLORETONE 
 CHLORINATED Lime, cubes, for generating CI 
 
 " Lime cubes Meick Blue Label 
 
 4f ti\ e chlorine yields at least 25% h\ neiaht 
 
 CHLORINE \\ ater Merck Blue Label 
 
 Nonvolatile matter iess than 0.0025% i Guaranteed 
 
 Hydrochloric Acid lesa than 0.018% | Analysis 
 
 CHLOROFORM. U. S. P 
 
 -CHLOROFORM, c. p Baker Analyzed 
 
 So. er J, 481 
 
 62°Cl, Typical 
 
 none ( Analysis 
 
 .... —0.03%' 
 
 incl 
 incl 
 
 per lb. 
 
 2.50 
 
 .50 
 
 incl 
 
 .10 cc 
 
 .m 
 
 .10 cc 
 
 .(« 
 
 .60 
 
 incl 
 
 .30 cb 
 
 1(1 
 
 .35 
 
 incl 
 
 Merck Blue Label 
 
 than 0.0014%-\ 
 ^^'^^.-miZ^i Guaranteed 
 Analysis 
 
 Free acid. 
 
 Alcohol 
 
 "CHLOROFORM 
 
 Nonvolatile matter, 
 Hydrochloric Acid. 
 
 Free Chlorine less than 0.0002% 
 
 Phoagea 
 
 Aldehyde 
 
 Foreign organic matter. 
 
 CHOLESTERIN Kahlbaum 
 
 CHROMIUM, metal, c. p., crystals 
 
 " Acetate, c. p., basic Baker Analyzed 
 
 " Ammonium Sulphate, c. p 
 
 (50% solution) 
 
 " Carbonate, e. p., basic 
 
 " Chloride, c. p. (50% solu- 
 
 tion) 
 
 .40 cb .OS 
 1.00 cb .08 
 
 Fe.. 
 Ni,. 
 Cu.. 
 
 Baker Analyzed 
 Baker Analyzed 
 
 Baker Analyzed 
 
 Let Typical 
 
 (Analysis 
 .„, 
 
 . LOO cb .08 
 2.50 cb .10 
 
 SOs 0.050%/ 
 
 CHROMIUM Chloride, c. p., dry 
 
 " Hydroxide, c. p Baker Analyzed 
 
 Nitrate, c. p. (40% solu- 
 tion) Baker Analyzed 
 
 Nitrate, c. p., dry.. 
 
 Oxide, 
 
 Potassium Sulphate, pure 
 crystals (Chrome Alum) . . . 
 Potassium Sulphate, powder 
 Potassium Sulphate, c. p, , . 
 
 Baker Analyzed 
 
 .75 gb .15 
 
 incl 1.50 cb .08 
 1.00 cb .09 
 
 1.00 gb .15 
 2.00 cb .08 
 1.15 cb .09 
 
 15 cc .05 
 
 18 cc .05 
 
 incl .30 cb .08 
 
 !iTi;0.. 
 
 —0.001%,' 
 
 CHROMIUM Sulphate, c. p. (30% solu- 
 tion) Baker Analyzed 
 
 " Sulphate, c. p., dry 
 
 " Trioxide (See Chromic Acid) 
 
 CHRYSAROBIN 
 
 CINNABAR, red 
 
 COBALT, metal, 98-99% cubes 
 
 " metal, c. p., (Nickel free) 
 
 " Acetate, c. p 
 
 " Ammonium Sulphate, c. p 
 
 " Bromide, c. p . 
 
 " Carbonate, c. p Baker Analyzed 
 
 " Chloride, c. p Baker Analyzed 
 
 " Chloride, c, p. (Nickel free)... . Baker Special 
 " Chloride (Nickel free) Kahlbaum 
 
 4.00 cb .08 
 2.00 cb .08 
 
 H lb. 1.40 incl 
 "ii'lh. 1.75 ""inci 
 
 }i lb. .75 
 
 i lb. 1.90 cb .14 
 
 34' lb. .25 incl 
 
 10 grm. 2.50 incl 
 1 grm. .50 incl 
 H lb. .65 incl 
 
 14 lb- -75 
 U lb. .25 
 
 }>i lb. .50 incl 
 Jilb. .35 incl 
 
 J4 lb, .65 incl 
 
 80 gb .15 
 
 .20 incl 1.75 cb .08 
 
 H lb. .15 
 
 M lb. .35 incl 
 K lb. .60 incl 
 
 3.50 incl 
 1.50 cb .08 
 
 M lb. 1.00 incl 
 
 10 grm. .50 incl 
 H lb. 1.25 incl 
 M lb. .65 incl 
 
 
 2.50 cb 
 
 .10 
 .08 
 
 Uib. 
 Klb. 
 
 .75 
 .75 
 
 incl 
 
 
 
 incl 
 
 .75 
 
 incl 
 
 incl 
 
 
"COBALT Nitrate, 
 
 :et Typical 
 
 ^^ noiio ( Analysis 
 
 X'OBALT Nitrate. ..■.■".V.';V''.V.";V*".V.'!™ Merck Blue Label .40 
 
 Suliihatea legs than 0.01% as SOi\ 
 
 Chlorides leas than 0.002% as CI I 
 
 Alka,li salts oot more than 0.25%' Guaranteed 
 
 ^"^°- less than 0.5% / Analysis 
 
 Lead leas than 0.02% \ 
 
 Copper less than 0,002% ' 
 
 XOBALT Nitrate, c. p. (Nickel free) Baker Special .75 
 
 Nitrate (Nickelfree) Kahlbaum 75 
 
 Nitrate (Nickel free) Merck Blue Label .75 
 
 Nickel less than 0.02% I 
 
 Sulphates less than 0.01% as SOt/ 
 
 Chlorides less than 0.002% as Clf ^ . j 
 
 Alkali salts not more than 25% > ?"""=?="" 
 
 Ziiic not more than 0.5%/ Analysis 
 
 Load less than 0.02%l 
 
 Copper less than 0,002% } 
 
 COBALT Oxalate, c. p 
 
 Oxide, c. p Baker Analyzed 
 
 Oxide Merck Blue Label 1.00 
 
 yulphur less than 0.0006% 
 
 " Sodium Nitrite, c. p 
 
 Sulphate, c. p Baker Analyzed 
 
 Pe 0.150%! 
 
 Ni 0.012% ( Typical 
 
 Baker Analyzed .20 incl 2.00 cb .08 '<i lb. .65 inci 
 
 0,008%! 
 
 
 
 .09 
 .06 
 
 Mlb. 
 
 U 02. 
 
 ' 'l< ib. 
 
 1.05 
 .95 
 .35 
 
 'go 
 
 
 
 3.00 cb 
 
 incl 
 
 00 
 
 
 
 
 
 
 
 
 1.75 cb 
 
 .08 
 
 incl 
 
 CI ■-<i.oooi%.' 
 
 COBALT Sulphate, c. p. (Nickel free) . . . Baker Special .30 incl 
 
 COCHINEAL, bugs 75 cc .06 
 
 " powder 85 cc .05 
 
 XOLLODION, U. S. P 55 incl 
 
 " 4% Merck Blue Label 60 incl U lb. .25 
 
 Acids none) Guaranleed 
 
 R«5iduo 3.8-4.0%) Analysis 
 
 COLOPHONY (Rosin), yellow, lump 10 cc .04 
 
 " (Rosin), white, lump 12 cc .04 
 
 CONGO rSee Test Paper) 
 
 COPPER, metal, shot form 40 cc .01 
 
 " metal, turnings, short .45 incl 
 
 " metal, granulated 60 incl 
 
 " metal, sheet .008 in 75 incl 
 
 " metal, by Electrolysis Merck Blue Label 1.00 incl J^ lb. .35 
 
 Foreign metals (Sh. Sn. Pb, Ag). , , ,none , 
 (FeiOs+BisOi) J 
 
 less than 0,01%\ Guaranteed 
 ( total raetaia) / Analysis 
 
 not more than 0,02%l 
 Arsenic less than 0,0001%.' 
 
 COPPER, metal, foil .002 in 1.50 incl 
 
 " metal, c. p., foil, 0,06-0.1 mm .15 incl 1.50 incl 
 
 Acetate (Verdigris) , powdered 40 cb .08 
 
 " Acetate, pure, crystals, neutral 55 cb .09 
 
 " Acetate, c. p Baker Analyzed 60 cb .08 
 
 " Aceto Arsenite, c p 2.50 cb .08 
 
 " Ammonium Chloride, t p ... Baker Analyzed 50 cb .08 ^i lb. .20 
 
 Cur 1 48 47% j 
 
 15 \Z%i Typi«. 
 
 larhnn .soluble) " nofl{ *-"'- 
 
 COPPER Ammonium Chloride ... Merck Blue Label 1.00 incl ^i lb .35 
 
 FrL.L arida nonel 
 
 Sulphj.tcs less than 0.01% a,9 SOjf Guaranteed 
 
 Salts of the alkahei earths etr not more than 0.06li%(' Analysis 
 Iron not more than 0,014% ' 
 
 COPPER Ammonium Sulphate, c p . . Baker Analyzed 60 cb .OS 
 
 " Arsenate, c p Baker Analyzed 1.00 cb .09 
 
 " Arsenite, c p 1-25 cb .07 
 
 " Bromide, c. p 40 incl 
 
 " Carbonate, true, powdered 30 cc .09 
 
 Carbonate, pure 45 cb .08 
 
 " Carbonate, c. p Baker Analyzed 70 cb .08 H lb. .24 
 
 Ci 0.0003%"i 
 
 Sds . — 0.001%V Typical 
 
 Fe OMOi%( Analysis 
 
 Nn " ' '.'.'. trace ' 
 
 Na. 
 COPPER Chloride, pure 
 
Chloride, c. p. (cupric) Baker Analyzed 
 
 SOj — . 1)01%\ 
 
 Fe 0.001%( Typical 
 
 Pl> , , . none/ Analysis 
 
 Chloride, (cupric) Merck Blue Label 
 
 Siilji^tiinr.eH insoluble in Alcohol,. 
 
 13 than 0.01% 
 
 sSQjf 
 
 S.ilts of the alkuli metals , 
 
 Iroi-, not more than 0,02S%L "'""*'"» 
 
 Arsoiiio , , less than 0.001% 1 
 
 Chloride (cupric) Kahlbaum "C.f .A." 
 
 Chloride (cupric) Kahlbaum "C.f. A." 
 
 Iron 1.0 nig. 1 \ 
 
 Alkaline reaidue present afterJ I 
 
 procipitatine Copper. 3.0 mg. ' In 10 ', Certified 
 
 .Arsenic none/ grama / Analysis 
 
 Sulpliate nonel \ 
 
 Solubility in Alcohol, .coraplete," / 
 
 Chloride, c. p. (cuprous) Baker Analyzed 
 
 SOs 001%i 
 
 Fe 0.0002% ( Typical 
 
 .trace/ Analysis 
 
 CuCl, 
 
 Chloride (cuprous) 
 
 agent Merck Blue Label 
 
 Chloride (cuprous) Kahlbaum "C.f. A." 
 
 Chloride (cuprous) Kahlbaum "C.f. A." 
 
 Residue present after precipi-'i '\ 
 
 tating Copper... unweighablel In 10 \ Certified 
 
 Iron Oxide none j" grama i Analysis 
 
 Color normal, whit*,' ' 
 
 Hydroxide, c. p 
 
 Hydroxide Merck Blue Label 
 
 Sulphates less than 0.001% SOj 
 
 Nitrate, pure crystals 
 
 Nitrate, c. p Baker Analyzcil 
 
 Fe 0002%! t™,.! 
 
 Q^^ ■■■; ■ "";;^;;[l;^Ss 
 
 Oxalate, c. p Baker Analyzetl 
 
 Oxide, c, p., black, fine Baker Analyzed 
 
 Oxide, c. p., black, coarse Baker Analyzed 
 
 . 010% I 
 
 ' Analysis 
 
 COPPER Oxide, 
 COPPER 
 
 c. p., wire Baker Analyzed 
 
 re 001% I Typical 
 
 AljOj 0,0002%i Analysis 
 
 Oxide, c. p., red Baker Analyzed 
 
 SOj 0.050%) T„„i,„, 
 
 <^l OMO%flJ.i'rl 
 
 Oxide Asbestos Merck Blue Label 
 
 Phosphate, c. p Baker Analyzed 
 
 Potassium Chloride, c. p Baker Analyzed 
 
 irbon (soluble) 
 
 Potassium Sulphate, c. 
 
 Baker Analyzed 
 
 COPPER 
 COPPER 
 
 COPPER 
 COPPER 
 
 Sulphate, comL, crystals (Blue 
 
 Stone) 
 
 Sulphate, coml., (powder) 
 
 Sulphate, pure, crystals 
 
 Sulphate, c. p., crystals, coarse 
 
 or fine Baker Analyzed 
 
 Fe 0.002%( Typical 
 
 CI 0,0002%! Analysis 
 
 Sulphate Merck Blue Label 
 
 Salts of the alkalies, earth, etc.. .not more than 0.033% J Guaranteed 
 
 Iron not more than 0.014% J Analysis 
 
 Sulphate Kahlbaum "C.f. A." . 
 
 Sulphate Kahlbaum "C.f. A." , 
 
 Iron 0,15 mel -J 
 
 Alkalies present after ( in 10 ( Certified 
 
 precipitatiiig Copper ...1,00 mgj grama/' Analysis 
 
 Other metals none ' ' 
 
 Sulphate, c. p., cryst. precip. 
 
 by Alcohol Baker Special 
 
 Fe 0.0002% I Typical 
 
 CI none j Analysis 
 
 Sulphate, c. p., anhydrous Baker Analyzed 
 
 Sulphate, atih drous in pumice 
 
 iucl .60 cb ,08 h lb. .22 incl 
 
 M !h. .90 incl 
 
 100 grm- M incl 
 500 grm. 2.70 incl 
 
 incl 1.50 cb .06 
 
 .45 eb .09 
 
 incl .65 cb .07 
 
 34 lb. .24 
 
 i..50cb .07 
 1.-50 cb .07 
 
 ,'4 lb. .20 
 U lb- .24 
 
 H lb. .90 incl 
 100 grm. 1.00 incl 
 500 grm. 3.10 incl 
 
 U' lb. .35 incl 
 M lb. 1.25 incl 
 
 1.50 cb .08 M. lb. .45 incl 
 
 .80 cb .06 H lb. .35 incl 
 1.00 cb .06 H lb. .35 incl 
 
 h lb. .45 incl 
 U lb. .45 incl 
 
 2.00 cb .10 1.^ lb. .65 incl 
 
 .45 cb .07 H lb. .20 incl 
 
 .50 cb 
 
 .07 
 
 
 i lb. 
 
 .20 
 
 incl 
 
 
 .0.5 
 .05 
 .07 
 
 
 
 
 
 .15 cc 
 
 
 
 
 
 .20 cb 
 
 
 
 
 
 .27 cb 
 
 .07 
 
 
 ilb. 
 
 .15 
 
 incl 
 
 .CO 
 
 iicl 
 
 
 4- lb. 
 
 .25 
 
 iticl 
 
 
 
 500 
 1000 
 
 grm. 
 grm. 
 
 1.15 
 1.93 
 
 incl 
 incl 
 
Merck Blue Label 
 
 COPPER, Sulphide, c. p 
 
 " Thiocjanate, c. p. (cuprous).... Baker Analyzed 
 
 COTTON, absorbent .... , . , . 
 
 " non-absorbent 
 
 " wool, specially selected for 
 
 plugging culture tubes 
 
 ^CREOLIN, Pearson's 
 
 "CREOSOTE, from Beechwood as recom- 
 mended for use in biological 
 
 laboratories 
 
 " from coal tar 
 
 CRESOL, U. S. P 
 
 CUBES, Chlorine, for generating Chlorine 
 (Also see Chlorinated 
 
 Lime) 
 
 " " Oxygen, for generating O xyg e n 
 
 (Also see Oxone) 
 
 " Sulphide, for generating Sulphu- 
 retted Hydrogen 
 
 " Sulphite, for generating Sulphur- 
 ous acid 
 
 " Acid Sulphurou ■, 20%, tested re- 
 agent 
 
 CUMARIN 
 
 CUMOL 
 
 CURARE, testea 
 
 DEVARDA'S ALLOY (See metal) 
 
 DEXTRINE, yellow, coml 
 
 " white, coml 
 
 " c. p., alcohol precipitated , , . 
 
 DEXTROSE (Glucose) white, lump 
 
 " anhydrous, pure, granular . . 
 
 " c. p.. anhydrous 
 
 DI-AMIDO-BENZOL (See Phenylene- 
 diamine) 
 
 "DIAMOND INK 
 
 DIASTASE of Malt (Maltine) 
 
 DICHLORETHYLENE 
 
 DICYANDIAMIDINE SULPHATE 
 
 Teste.! for auitahility as a reagent for Niekal 
 
 DIMETHYL-AMIDO-BENZALDEHYDE 
 
 (Para) 
 
 DIMETHYL-AMIDO-BENZOL (Sec Di- 
 methyl-aniline) 
 
 DIMETHYL-AMIDO-AZO-BENZOL 
 
 (I'ara), c. p 
 
 DIMETHYL- ANILINE 
 
 DIMETHYLGLOXIME 
 
 1.25 cb .07 
 1.60 cb .08 
 .35 incl 
 .35 incl 
 
 .25 incl 
 .67 cb .08 
 
 .80 gb 
 .40 gb 
 .25 cb 
 
 .45 cb .10 
 .50 cb .10 
 
 Merck Blue Label 
 Kahlbaum 
 
 10 cc .05 
 
 .10 cc .05 
 
 90 cb .09 
 
 10 cc .06 
 
 15 cc .05 
 
 .15 cb .03 1.40 cb .08 
 
 5 incl 
 5 cb .04 
 
 T&sted for auitabilit.v aa a reagent for Nicfre! 
 
 DIMETHYL-PARAPHENYLENE-DIAM- 
 INE HYDROCHLORIDE 
 
 DIMETHYL-PARAPHENYLENE-DIAM- 
 INE HYDROCHLORIDE 
 
 Nonvolatile matter leaa than 0.059; 
 
 DIMETHYLSULPHATE 
 
 DIPHENYLAMINE. c. p., crystals, whitest 
 DIPHENYLAMINE 
 
 Nitric Acid Ie,sa than 0.05% aa NiOs t 
 
 .4niline less than 0.05% ) 
 
 DISTILLED WATER, in 5 gal. crated 
 
 bottle 
 
 DULCITE (Melampyrite) 
 
 DUTCH LEAF 
 
 EDINOL 
 
 EIKONOGEN 
 
 EMERY, fine, 180 mesh 
 
 " medium, 80 mesh. 
 
 " coarse, 40 mesh 
 
 ESCHKA'S Mixture (See Magnesium Oxide 
 and Sodium Carbonate). 
 
 "ETHER (Sulphuric), U. S. P 
 
 " " (Sulphuric), U. S. P 
 
 Merck Blue Label 
 Merck Blue Label 
 
 .90 cb .03 . 
 
 .15 cb .03 l.f 
 1.50 incl 
 2.00 incl . 
 
 Merck Blue Label 
 Merck Blue Label 
 
 Merck Blue Label 
 
 Guaranteed 
 Anufysis 
 
 1.30 incl 
 
 cb .03 2.50 cb .08 
 
 .70 cb .03 
 .35 cb .03 
 
 .15 cc .04 
 .12 cc .04 
 .10 cc .04 
 
 H lb. .40 incl 
 Yi lb. .60 incl 
 
 olb. 1.10 cb .15 
 
 1 lb, 1.50 incl 
 
 ij lb. .25 incl 
 15 gr.3. 1.35 inci 
 
 Y oz. .20 incl 
 lOgrm. 1.00 incl 
 
 H lb. 4.75 incl 
 H lb. 7.50 incl 
 Ya oz. .35 incl 
 
 14 oz. 1.25 
 1.5 grn. .30 
 
 5 gim. 4.50 
 book .10 
 
 Mlb. 
 «lb. 
 
°ETHER (Sulphuric), U. S. P... 
 ° " (Sulphuric), U. S. P,.. 
 ° " (Sulphuric), U. S. P..., 
 ° " (Sulphuric), U. S. P., i 
 °ETHER (Sulphuric), U. S. P., . 
 Sp.gr 
 
 B. P 
 
 Alcohol 
 
 Baker Analyzed 
 
 20 
 
 ,40 en .10 
 
 °ETHER 
 "ETHER 
 
 =ETHER, 
 °ETHER, 
 
 (Sulphuric), concentrated 
 
 (Sulphuric), concentrated 
 
 (Sulphuric), concentrated 
 
 (Sulphuric), sp. gr. 0.720 
 
 Eth\-I Peroxide, Hydroeeo. Peroxide, 1 
 
 and Oione Qoae f 
 
 Aldehydes and Vinyl Alcohol none 
 
 .Sulphur compounds nonet 
 
 Acetone less than 0,005% ) 
 
 Water less than !%■■ 
 
 (Sulphuric), washed 
 
 (Sulphuric), washed 
 
 Alcohol trace I 
 
 Water 2% ( 
 
 distilled over Sodium 
 
 Alcohol 0.0001% t 
 
 Water tracej 
 
 distilled over Sodium 
 
 distilled over Sodium 
 
 Residue none 1 
 
 Ethyl Pero!£ide, Hydrogen Peroxide J 
 
 and Ozone "onef 
 
 Aldehydes and Vinyl Alcohol, 
 Sulphur compounds 
 
 Squibb 
 Squibb 
 Squibb 
 Merck Blue Label 
 
 Baker Analyzed 
 
 Typical 
 Analysis 
 
 Baker Analyzed 
 
 Typical 
 
 Analysis 
 
 Kahlbaum 
 Merck Blue Label 
 
 .3 tha 
 
 ■33 than 0.3% 
 
 0,01% I 
 3 0-3% 1 
 
 Alcohol 
 
 , Acetic, 90%, U. S. P. 
 
 Acetic, 98>^% 
 
 Acetic, c. p., absolute 
 
 Sp. gr 0,925 I 
 
 B. P i2-irc\ 
 
 Alcohol 0,4%. 
 
 Acetic Acid 0.045% L 
 
 Water trace 1 
 
 , Butyric, 98% (So-called absolute) 
 Petroleum, 40-65''C. b. p 
 
 Baker Analyzed 
 
 "ETHER, Petroleum 
 
 Sp. ET 0,64-0,67 t 
 
 H, P 40-e5''C( 
 
 "ETHER, Petroleum, 2,'j-40''C. b. p 
 
 ° " Petroleum (Benzin) 
 
 Nonvolatile matter and heavy oils ...nonej 
 
 Acid.s none!. 
 
 Sulphur compounds and reducing t 
 
 agents none/ 
 
 FELDSPAR, powder 
 
 FEHLING'S Alkaline Solution 
 
 " Copper Solution 
 
 FIBRIN, from blood 
 
 FIRE CLAY 
 
 FLUORCHROME 
 
 FLUORSPAR, powdered (See Calcium Flu- 
 oride) 
 
 FORMALDEHYDE, Solution, U. S. P 
 
 Solution, U. S. P 
 
 Solution, U. S. P 
 
 (40% solution) 
 
 "FORMALIN" 
 
 FULLER'S EARTH 
 
 FURFURAL 
 
 FURFURAL, tested reagent 
 
 " tested reagent , . 
 
 'FUSEL OIL (See Amyl Alcohol), 
 
 GALACTOSE 
 
 GALLEIN, dry, tested reagent 
 
 GALLNUTS, native black 
 
 " powdered 
 
 GELATINE, Gold Label, specially selected 
 for preparation of bacterio- 
 logical culture media 
 
 Baker Analyzed 
 
 Typical 
 Analysis 
 
 Baker Special 
 Merck Blue Label 
 
 Baker Analyzed 
 Schering 
 
 Merck Blue Label 
 Merck Blue Label 
 
 21b. 
 
 .68 
 
 incl 
 
 31b. 
 
 ,96 
 
 inci 
 
 5 lb. 
 
 1.55 
 
 incl 
 
 551b. 
 
 11,00 
 
 4.00 
 
 a lb. 
 
 ,20 
 
 incl 
 
 H\b. 
 
 ,26 
 
 incl 
 
 Wh. 
 
 ,45 
 
 incl 
 
 1 Idlo 
 
 1.70 
 
 incl 
 
 .40 incl 
 .95 en .10 
 
 ■lib. ,35 
 
 500 grm. 1,.35 incl 
 
 ,70 cb .09 
 .80 cb .09 
 1,50 cb .08 
 
 ,60 en .10 
 .50 incl 
 
 ,10 cc .04 
 ,50 cb .OS 
 ,50 gb .12 
 
 ,10 cc .04 
 
 .20 cb .08 
 
 .17 
 
 .12 
 
 .30 cb .OS 
 
 .45 incl 
 
 .10 incl 
 
 Merck Blue Liibel 
 
 .80 cb .01 
 1.50 incl 
 
 A. II. T. Co. «.33 
 20 
 
 1 pt. ,25 cb .08 
 1 gal. 1,00 en .25 
 1 gal. 2,00 en .25 
 
 5 lb. ,90 cb .20 
 
 9 lb. 1.53 cb .25 
 
 1001b. 12.00 cby2.00 
 
 25 grm. 1.50 
 6 grm. .40 
 
 incl 
 incl 
 
 incl 
 ■ .06 
 
r-li-l »TIXTE> T-" 1 ^ Maker or Brand per oz, coiil, par II 
 
 ULLA 1 INL, Extra, for preparation of bac- 
 
 GLASS WOot bl>°!'SlmS:rLrdS.e: '■°'^™' ^ ■•»" 
 
 .00 incl M lb. 2.25 
 
 best bohemiaii, coarse 50 incl 5.00 incl K lb. 1.75 
 
 best liohemian, fine 55 incl 5.75 inol % lb. 2.00 
 
 Merck Blue Label .50 incl J4 lb. 1.50 
 
 .10 
 
 GLASS WOOL,, 
 
 Material soluble ii. ■ 
 
 Hydrochloric Acid, .not more than 8%> Guaranteed 
 
 r-iACC. i> A ^""'^ leas than 0.0025% A"«'>'S>s 
 
 GLASS, Powder 
 
 GLUCOSE (Dextrose), white, lump '.'.,... .10 cc 06 
 
 /-T vAV^.tivt'^®''^^"^^'' ^- P- iinhydrous '. .15 cb" ".03 K40 cb SiS 
 
 GLYCERIN, c, p., neutral 35 cb .08 5 1b. 1.60 en .18 
 
 c. p., neutral -8 ^^^y^ 2.80 en .25 
 
 c. p neutral 25 50 lb. 12.50 incl 
 
 Indrums of 550 or 1100 lbs., 
 
 price on application. 
 GLYCERIN, sp. gr. 1.25 Merck Blue Label 60 incl 
 
 Tested for Neutrality 
 
 Arsenic lesg than 0.0013% \ 
 
 Inorganic matter lesa than 0.008% 
 
 Substances wliich reduce Aminoniacal Silver 1 
 
 Nitrate solution none I 
 
 Fatty acid esters ..less than 0.115% as Ettyl Butyrate^ 
 Hydrochloric Acid and I 
 
 Chlorides less than 0.0004% as CI Gunranfei^d 
 
 Sulphuric Acid less than 0.0024% as SO Analysis 
 
 Oxalic Acid less than 0.00fi4% 
 
 Heavy metals none I 
 
 Calcium. less than 0.005% \ 
 
 Sugars less than 0,04% as Saccharose 1 
 
 Readily carbonizable matter none I 
 
 Dextrose and organic bodies none / 
 
 Ammonium compounds less than 0.003% as NHs 
 
 GLYCERIN, sp. gr. 1.23 Merck Blue Label m incl 
 
 Same impurities as above. 
 
 GLYCOCOLL 15 gr, .35 incl 
 
 GOLD LEAF book .50 incl 
 
 " Chloride, pure, crystals 15 er. .45 incl 
 
 GRAPE SUGAR (See Glucose or Dextrose). 
 
 GRAPHITE, powder 15 ce .06 
 
 GUAIACIN, tested reagent Merck Blue Label 3^ oz. .80 incl 
 
 GUM Arabic, white, granular 10 cc .03 .60 cc .05 
 
 Arabic, white, powder 10 cc ,03 .60 cc .05 
 
 Camphor, refined 1.00 cc .06 
 
 Damar 45 cc .05 
 
 Guaiac 50 cc .05 
 
 Mastic, tears 1.15 incl 
 
 Shellac, orange, flake 45 cc .04 
 
 Shellac, bleached 50 cc ,04 
 
 Tragacanth, powdered 1.00 cc .05 
 
 GYPSUM (Calcium Sulphate) 10 cc .05 
 
 HAEMOGLOBIN, powder 30 cb .04 
 
 scales 25 cb .03 
 
 HEMATEIN, tested reagent Merck Blue Label Vsoz. .60 incl 
 
 (See also Grueblers Stains) 
 
 HEMATOXYLIN, tested reagent Merck Blue Label 3^ oz. I.IO incl 
 
 " " " Merck Blue Label H oz- -30 incl 
 
 (See also Grueblers Stains) 
 
 HIDE POWDER, for standardizing 3.-50 incl }/i lb. 1.05 incl 
 
 American Standard 40 cc .03 4.00 cc .06 5 lb. 18.75 incl 
 
 " tested reagent Merck Blue Label .50 incl J^ lb. 1.50 incl 
 
 HIRUDIN, for preventing coagulation of 
 blood, 1 milligram of Hirudin 
 keejJs ly^ cc. of blood in a 
 
 liquid condition ys grm. 3.75 incl 
 
 •' same as above ]-,',jr grm. .75 incl 
 
 HYDRAZINE Sulphate Merck Blue Label 1.00 incl ^ oz- -35 incl 
 
 Chlorides,,, less than 0.002% as Cn Guaranteed 
 
 Heavv metals : . .none*- in„[^His, l 
 
 Nonvolatile matter leas than 0-05% ) A"""'s« 
 
 HYDROCHINONE 15 mcl .80 incl ^i lb- .25 incl 
 
 HYDROGEN Peroxide, U. S. P 20 incl 5 lb. .80 incl 
 
 HYDROGEN Peroxide, c. p Baker Analyzed .50 cb .08 
 
 H:0; 3-90%) 
 
 Fe 0,0001%( TvDical 
 
 SO, 0.025%;- lEi8 
 
 M^ 0,005% \ *""'''^'* 
 
 Nonvolatile matter. 0.100% t 
 
 HYDROGEN Peroxide Marchand 75 incl 
 
 27 
 
HYDROGEN Peroxide (Di(j> 
 " Pero\ide iSO' , 
 
 " PeroxHk h 
 
 Free i I 
 Suliliii I I 
 
 (ReMlu , , , 
 
 Slllplaiii, irni II 
 -^tid-. <.!■ ) 
 Oxaiic \cid 
 Hidrorhl-mt \<id 
 H\ drofluoric 4nd 
 Phosphoric ■Vcid 
 
 HYDROGEN Sulphide Water 
 
 
 O.ikland Chera. Cc 
 Merck Blue Label 
 Merck Blue Label 
 
 200 grm. 2.50 
 50 grm. .85 
 
 S03^ 
 V < 
 
 less than 0045% 
 
 leJ3 than 035?c 
 
 le'iathjri0 0005f"c w CI 
 
 If33than 11005% 
 
 le^a than 000b°i ji PiOs 
 
 Iro 
 
 Merck Blue Label 50 
 
 HYDROXYLAMINE Hydrochloride 
 
 Nonvolatile matter 
 
 Ammoninm Chloride less than 0,3' 
 
 Sulphuric Acid less than 0.0005% 
 
 Heavy metals at most 
 
 . Merck Blue Label 
 
 than 0.05% ) 
 
 Guaranteed 
 
 ICELAND SPAR, for standardizing. . 
 
 INDIGO, Madras, lump 
 
 " Bengal, lump 
 
 INDIGO. Vegetable, 60% 
 
 a than 0.0015% 1 
 
 Moisture 
 
 INDIGO Synthetic, 95%. 
 
 Ash . 
 
 Moisture 
 
 INDIGO Solution. 1-40... 
 INDIGO Solution. 1-1000. 
 INDOL 
 
 Merck Blue Label 
 
 I Guaranleed 
 ( Analysis 
 
 Merck Blue Label 
 
 ) Guaranteed 
 ( Analysis 
 
 Merck Blue Label 
 Merck Blue Label 
 
 .75 cc .04 
 
 1.25 cc .04 
 
 .75 
 
 .75 
 
 INFUSORIAL EARTH (Kieselguhr) 
 
 INULIN, white (Alant Starch) 
 
 " Dragendorff 
 
 " Kiliani 60 i 
 
 lODEOSIN Merck Blue Label .75 i 
 
 Te-sted tor sensitiveness 
 
 IODINE, pure, resublimed 35 gb 
 
 IODINE, resublimed Merck Blue Label .45 
 
 Nonvolatile matter less than 0.05% \ 
 
 Cyanogen leas than 0.05% V Guaranteed 
 
 Chlorine and ( Analysis 
 
 ■ 4.25 gb 
 1 S.-'jO i 
 
 ..less than 0.12% t- 
 
 IODINE Pentoxide. c. p 
 
 IODINE Water. 
 
 Tested for si 
 
 IRON Filings, coarse 
 
 " Filings, fine 
 
 by Hydrogen, 90% 
 
 IRON by Hydrogen 
 
 Residue in.soluble in 
 
 Sulphuric Acid no 
 
 Sulphides less 
 
 Merck Blue Label 
 
 1.10 
 
 Merck Blue Label 
 
 t more than 0.5% i 
 
 than 0.007% aa S l. Guaranteed 
 
 more than 0.06% / Analysis 
 
 lore than 0.0028% \ 
 
 less than O.OOlSSi ' 
 
 Merck Blue Label 
 
 IRON, Powder 
 
 Tested for insolubility in Hydrochli 
 
 Nitrogen not more th; ^ _^ 
 
 Arsenic 'ess than 0.0015% i Analysis 
 
 Foreign heavy metals , none,' 
 
 IRON Wire, for standardizing, on spool 
 
 " Wire. Same as above 
 
 " Wire, for standardizing on spool. , . 
 " Acetate, c. p., solution, (ferric), . . . 
 
 " Ammonium Citrate (ferric) 
 
 " Ammonium Oxalate, c. p. (ferric) 
 " Ammonium Oxalate, c, p. (ferrous) 
 " Ammonium Sulphate, c. p. (ft;rric) 
 
 (Iron Alum) Baker Analyze 
 
 k™™s.,..-.v.;:;:::::. ::::::::-:: -°StT*'' 
 
 Nitrate tncei '>""1»'« 
 
 IRON Ammonium Sulphate (ferric). . . 
 
 Ferrous salt less than 0.002.5',o te' j 
 
 Chlorides less than OOOOS'.t ^is CI t ...... , ., 
 
 Zine le.1 than 0.00.5% '. C.u.r.nteed 
 
 Copper less than 01% I *'"")'S'8 
 
 Alkali salts not more than 0.04% } 
 
 28 
 
 Merck Blue Label 
 
 Baker Analyzed 
 Baker Analyzed 
 
 Merck Blue Label 
 
 .50 i 
 
 .10 cc 
 .10 ec 
 .55 cb 
 1.25 i 
 
 a lb. .40 
 
 H lb. .20 
 
 incl ..50 cb .08 
 
 ,'4 lb. 
 
 incl 
 incl 
 
 H]h. 
 
 .30 
 
 incl 
 
 >, Ih. 
 
 .30 
 
 mcj 
 
 Aprrn 
 
 .55 
 
 incl 
 
 1 grm 
 
 3.00 
 
 incl 
 
 10 grm 
 
 .15 
 
 incl 
 
 10 grm 
 
 .25 
 
 incl 
 
 10 grm 
 
 .25 
 
 incl 
 
 }i oz 
 
 .25 
 
 incl 
 
 
 
 Mlb. 
 
 H lb. 
 
 .50 grm. 
 
 ■ " 'H lb. 
 Mlb. 
 Mlb. 
 
 .30 
 .45 
 .50 
 
 incl 
 
 
 
 incl 
 
 
 
 incl 
 
 .50 cb 
 
 .OS 
 .08 
 .08 
 .08 
 
 
 1.25 cb 
 .80 cb 
 .75 cb 
 
 .40 
 .30 
 .25 
 
 incl 
 incl 
 incl 
 
IRON Ammonium Sulphate, c. p. (ferrous) Baker Analyzed 
 
 Feia one gram 0.H2-0.143 i 
 
 .60 cb 
 
 .08 
 
 HIb. 
 
 .25 
 
 iiicl 
 
 .50 cb 
 
 IK 
 
 If lb. 
 
 .211 
 
 inci 
 
 .35 cb 
 
 .07 
 
 !i lb. 
 
 .rs 
 
 incl 
 
 .25 cb 
 
 .09 . 
 
 
 
 
 .35 cb 
 
 .08 
 
 >ilb. 
 
 .17 
 
 iiicl 
 
 CI "..'.'.'.'..' 6!ooo2% ) 
 
 IRON Ammonium Sulphate (ferrous) Merck Blue Label 
 
 Fornc salts less than 0,000S% Fe'" i 
 
 Copper lesa than 0,01% ( Guaranteed 
 
 ■^'"c less than 0.003% / Analysis 
 
 Alkali salts leas than 0.0167% ' 
 
 IRON Ammonium Sulphate, c. p. (ferrous) 
 
 (Phosphorous free) Baker Special 
 
 " Ammonium Sulphate, c. p., (ferrous) 
 
 large crystals, for standardizing 
 
 " Carbonate, c. p., moist (ferric) Baker Analyzed 
 
 Carbonate, c. p., moist (ferrous) . . . Baker Analyzed 
 
 " Chloride puie lump (feme) 
 
 Chloride, c p (feme) Baker Analyzed 
 
 lurroug Salt runt i 
 
 HI I tr-kcc / ^ . , 
 
 HNO= traced ^""'i's's 
 
 P trace* 
 
 IRON Chloride, c. p. (fernc) (Phosphorus 
 
 free) Baker Special .15 incl .90 cb .08 ]i\h. 
 
 " Chloride (ferric) Merck Blue Label 60 incl i^ lb. 
 
 Iia.sic Salt and other Substances ditficultl.v 
 
 Hydmr.hloric Acid' "" j'l'csV i-han 'o'.35%'hC1 a 
 
 axul Chlorine I less than 0.001% CI 
 
 ArspTiif less than 0.0011% I 
 
 Ferrous salt less than 0.0025% Fe" V 
 
 Cooper .less than 0.005%/ 
 
 Zinc less than 0.015%/ 
 
 Nitric Acid less than 0.025% as NjOil 
 
 Alkali salts and 1 
 
 Caleiiiin not more than 0.0117% 1 
 
 SulphatHS less than 0.0025% as SOa/ 
 
 IRON Chloride, solution (ferric) Merck Blue Label 55 incl ?-i lb. 
 
 The same impurities as above. 
 
 IRON, Chloride (ferric) Kahlbaum "C.f.A." 100 grm. 
 
 " Chloride (ferric) Kahlbaum "C.f,.A." 500 grin. 
 
 Free Hj-drocliloric Acid .... 
 
 Free Chlorine 
 
 Ferrous salts 
 
 Sulphate. , , 
 
 Nitrat« none \ in 'f V Cerlified 
 
 Alkalies and Calcium Oxide . . 
 Manganese 
 
 u 
 
 ]e /grams / Analysis 
 
 Basic salts 
 
 IRON Chloride, c. p. (ferrous) Baker Analyzed .10 incl .55 cb .OS 
 
 WOa , , , 0,005% I Typical 
 
 Ferric Salt present) Analysis 
 
 ( 0>:idize3 readily in the air) 
 IRON Chloride (ferrous) Merck Blue Label 70 incl ^i ib. .30 incl 
 
 Oxvchloride at most a small amount i 
 
 Sulphates. less than 0.0075% as SO; I 
 
 Copper less than 0.03% ' Guaranleed 
 
 Zinc less than 0.0075% { Analysis 
 
 Alkali salts not' more than 0,03% * 
 
 Arsenic less than 0.0015%." 
 
 IRON Ferrocyanide, insoluble 50 cb .12 
 
 " Hydroxide, c. p., moist (ferric) Baker Analyzed 60 cb .08 H lb, .25 incl 
 
 "IRON Nitrate, c n , crystals (ferric) ... Baker Analyzed .10 incl .80 gb .15 141b. .27 incl 
 
 ik UOO?l( Typical 
 
 Free acid trace ) 
 
 "IRON Nitrate (fernc) . . - Kahlbaum "C.f.A." .00 gnn. .80 incl 
 
 ° " Nitrate (ferric) . . . Kahlbaum "C.f.A." 200 grm. 2.00 mcl 
 
 Sulphate nonf , •, 
 
 Chlorides noni- 1 i 
 
 AlUhea iqiJr'^^' 11 10 ' Certified 
 
 Iron Ok.ido ^^ *'^' '"/ crania/ Analysis 
 
 equivalent to I L 
 
 Crystallized Feme Nitrite 9M08%J I 
 
 Moisture remainder- 
 
 IRON Oxalate, c. p., crystals (ferric) Baker Analyzed 1.25 cb .08 }4 ib. .40 incl 
 
 " Oxalate, c. p (ferrous) Baker Analyzed 1.00 cb .OS 14 lb. .35 incl 
 
 " Oxide, red (ferric), {Jewelers rouge 
 
 for polishing purposes) 3o cb .08 
 
 IRON Oxide, c. p. (ferric) Baker Analyzed .65 cb .08 34 lb. .25 mcl 
 
 " Oxide, c 11 , from O.xalate (ferric) . Baker Special 1.25 cb .08 i-:,' lb. .40 mcl 
 
 Cl 0.005% I Typical 
 
 Sda.V, .'.'.■.■■. '-'.'.'.'.'. 0.001%. i Analysis 
 
.10 cc 
 
 04 
 
 .35 cb 
 
 m 
 
 .10 cb 
 
 .na 
 
 .12 cb 
 
 .IK 
 
 .35 cb 
 
 -OS 
 
 T H O M 
 
 IRON Oxide (ferric) :\Ierck Blue Label .80 
 
 Water and volatile sub- 
 Substances soluble in water. ..leas tU:ui I). Ill',, \ 
 
 Ct^iorides leas than O.OO.V.;, u^ ('\i 
 
 Nitrates less than 0.0(1S3% ^<i N;i >,i 
 
 Sulphates .less than 0.035^".. iis SUjf 
 
 Silicates not more than 0.033% SiOs \ Guaranteed 
 
 Ferroua Oxide leas than 0,003% ; ^"^u^,^ 
 
 SubataQces insoluble in Hydrochloric / 
 
 Acid not more than 0.01% I 
 
 Foreign heavy metals nonel 
 
 Abiminum not more than 0.02% AliOa 1 
 
 Calcium not more than 0.007% ' 
 
 Magnesium leas than 0.00027^/ 
 
 IRON Oxide (ferric) Kahlbaum "C.f.A." 
 
 Ferric Oxide 99.60%) j 
 
 Moisture remainder v in 10 1 Certified 
 
 ManRanese none (grams ( Analysis 
 
 Alicalies noce.» .' 
 
 IRON Pyrites 
 
 " Sulphate, c. p. (ferric) Baker Analyzed .35 fb .OS H lb. .15 
 
 Ferrous Salt none J 
 
 IRON Sulphate, coml. (ferrous) (Copperas) 10 cb 
 
 " Sulphate, pure, crystals (ferrous) 
 
 Sulphate, c. p. (ferrous) Baker Analyzed 
 
 P.. trace I 
 
 p^ "^11 [ Typical 
 
 ci.v.;:;v.v;::;;:;::::;;::::::;:;::::::::;noT,ci Analysis 
 
 Ferric Salt trace » 
 
 IRON Sulphate (ferrous) Merck Blue Label -50 incl li lb. .20 iiic! 
 
 Sub.stances insoluble in Water none j 
 
 Alkali salts.. not more than 0.03% I Guaranteed 
 
 Zinc less than 0.0036% ( Analysis 
 
 Copper lesa than 0.012%.,' 
 
 IRON Sulphate, c. p., precipitated by alco- 
 hol (Phosphorus free) (ferrous) 50 cb .08 
 
 " Sulphate, c. p., anhydrous (ferrous) 50 cb .08 
 
 " vSuIphide, fused, lump (ferrous) 12 cc .04 100 1b. 8.00 incl 
 
 " Sulphide, granular (ferrous) 12 cc .04 100 lb. 8.00 iucl 
 
 " Sulphide, fused, sticks (ferrous) 15 cc .05 lOOlb.13.00 incl 
 
 " Sulphide, granular, sticks, or lumps, 
 
 (ferrous) tested reagent :Merck Blue Label 40 incl 
 
 KAOLIN 10 cc .04 
 
 " acid washed 20 cc .04 
 
 KIESELGUHR (Infusorial Earth) .10 cc .04 
 
 LACMOID, c. p., scales 65 cb .04 
 
 :\Ierck Blue Label 1.00 incl i^ oz. .35 incl 
 
 'i'cftted for, .Sensitiveness 
 
 LACMUS (See Litmus). 
 
 LACTOSE, powder (Milk Sugar) 22 incl 
 
 LACTOSE, c. p., free from Dextrose, for 
 
 bacteriological work Kahlbaum 50 cb .09 
 
 LAMPBLACK 15 incl 
 
 LEAD, ill sheets 20 incl 
 
 metal, free from silver, sheets, 6 
 
 inches wide .25 incl 
 
 foil (Test Lead), free from silver 
 
 0.04 mm thick 80 incl 
 
 granulated (Test Lead), free from 
 
 silver .25 cb .06 
 
 metal, free from silver. Sticks 6 
 
 inches by |j- inches, . 
 
 Acetate, coml., crystals 
 
 .Acetate, pure 
 
 LEAD Acetate, c. p Baker Analyzed 
 
 Fe 0-0003%,'i 
 
 CI 0.001% { Typical 
 
 CaO 0.001%, ( Analysis 
 
 Na trace" 
 
 LEAD Acetate Merck Blue Label 
 
 .30 
 
 ncl 
 
 .20 cb 
 
 ,(17 
 
 .25 cb 
 
 1)7 
 
 .30 cb 
 
 .07 
 
 Earths and alltidies not more than 0.02%\ 
 
 Coppar less than ""' 
 
 Iron less than 
 
 Aluminum less tlian 0.1% V Guaranteed 
 
 Lead Carbonate and sub- / Analysti 
 - - ■ eel 
 
 an 0.02%\ 
 n 0.001% i 
 n 0.003% f 
 ian0.1%V < 
 
 I insoluble in Water .. .at moat a trace I 
 
 Chlorides less than 0.0005% as CI 1 
 
 Nitrate-s less than 0.0032% as NiOs/ 
 
 LEAD Acetate Kahlbaum "C.f.A." 100 gn 
 
ARTHUR H. 
 
 T H O M 
 
 A S 
 
 c 
 
 M 
 
 P . 
 
 \ N 
 
 Y 
 
 
 
 M^ker or BranJ 
 Kahlbaum "C.f.A. 
 
 tlerlilied 
 
 Analysis 
 
 MerfkBlue Label' 
 
 Analysis 
 
 Bakei imh/ea 
 
 Typical 
 Analysis 
 
 Baker \nah zed 
 
 Biker A.nihzed 
 Baker Analyzed 
 
 Typical 
 Analysis 
 
 Baker Analyzed 
 
 1 
 Typical 
 Analysis 
 
 1 
 Merck Blue Label 
 / Guaranteed 
 f Analysis 
 
 Ounc 
 
 3 and pound prices 
 
 
 Price in othe 
 
 IP size packages 
 
 LEAD Acetate 
 
 per 0?. 
 
 coMt. per Ih. c 
 
 :..l. 
 
 5ii9 pkg. 
 
 .500 grm. 
 
 'A lb. 
 ,'i lb. 
 
 > , lb. 
 
 >4 lb, 
 ij lb. 
 
 Klb. 
 
 per pkg. 
 2.75 
 
 coat, 
 incl 
 
 
 LJ 
 
 /grams/ 
 
 in, for 
 
 ri24 
 0006% ( 
 0002% i 
 SUgll 
 
 001% I 
 001% ( 
 001% i 
 
 001% \ 
 
 fused 
 
 0003% 
 
 traci.i 
 002%' 
 
 Lan 0,02% 
 
 .25 gb 
 .40 
 
 .15 
 incl 
 
 .00 
 
 incl 
 .06 
 
 '.09 
 .06 
 
 .00 
 
 .07 
 
 incl 
 
 .07 
 .06 
 .06 
 
 .06 
 .04 
 .06 
 
 
 
 
 Ch'o^de,. slight trace 
 
 Alkalies aod earths m 
 
 
 
 
 Copper none 
 
 LEAD Acetate, c. p., basic, solutic 
 
 sugar analysis 
 
 \cetate, basic, solution, sp g 
 
 Copper leas than 
 Iron less than 
 
 LEAD -Vcetate c p, bs-sic, div, for 
 anthbis 
 
 CaU 
 
 n 
 
 Ni 
 
 LEAD \cetate, c p tribasic 
 " \rsenate. c p 
 " Borate c p 
 " (.arbonate pmified 
 
 
 
 
 
 ..■iO cb 
 
 .20 
 
 incl 
 
 .20 
 .15 
 
 iiifl 2.00 cb 
 
 inrl 
 
 .60 cb 
 
 .65 
 
 incl 
 
 .'20 
 .20 
 
 .40 
 1.00 
 
 
 LEAD (arbonate, c p bisie 
 " Chloride 
 
 le 
 Cu 
 
 Na 
 LEAD Chromate, c p , powdered or 
 clo 
 
 Lu 
 Na 
 ^O, 
 
 LEAD Chromate 
 
 
 .50 cb 
 
 , .50 cb 
 
 incl 
 incl 
 
 incl 
 
 
 1.20 
 
 incl 
 
 Substances soluble la 
 Water not more tt 
 
 
 . .3.50 cb 
 
 , .21 cc 
 
 .25 cb 
 
 
 LEAD Iodide, c. p 
 
 
 incl 
 
 ° " Nitrate, c. p 
 
 ■ 6.0063% 
 . 0.001%' 
 0.0002% 
 
 p 
 
 q3 6% 
 001% 
 
 Baker Analyzed 
 
 \ Typical 
 j' Analysis 
 
 Baker Analyzed 
 
 
 
 
 . . .90 cb 
 . .30 cc 
 
 .80 cb 
 
 .33 
 
 
 CaO 
 
 
 SOi 
 
 LEAD Oxalate, c. p 
 
 " Oxide, brown (Lead Peroxid. 
 " Oxide, brown (Peioxide), c 
 
 P1.0 
 
 n 
 
 incl 
 
 Baker Analyzed 
 
 [ Typical 
 J Analysis 
 
 incl 
 
 
 
 
 " Oxide, brown (Peroxnle), c p Baker Special 
 
 LEAD Oxide, brown, foi ultimate analysis Merck Blue Label 
 
 Chlorides less than 0.00J% a '^' 
 
 e than 0.5% I 
 
 
 sNiOs 
 
 Analysis 
 
 Calcium and alkalie 
 
 Sulphates less than O.Oi 
 
 Nitrates. less than 0.0032% a 
 
 Carbonates none t 
 
 LEAD Oxide, brown, granulated, for use in 
 
 elementary analysis :Mcrck Blue Label 
 
 " Oxide (Orange Mineral) (Manga- 
 
 LEAD Oxide, brown (Manganese free)... . Merck Blue Label 
 
 Chlori.les less than 0,001% as CI \ 
 
 Sulphates less than 0.0015% as SOj I 
 
 Substances soluble in water \ Guaranteed 
 
 (Lead Nitrate, etc) less than 0.0375% / Analysis 
 
 Calcium and alkalies.... not more than 0.5% I 
 ' a than 0.0002% ' 
 
 J 4 Ib- 
 
 '2 lb. 
 
 .40 
 1.20 
 
 
 
 
 i.jlb. 
 I's ib. 
 
 1.20 
 1.20 
 
 incl 
 
 
 .25 cb 
 
 .04 . 
 
 
 t- -..- 
 
 id 
 
 incl 
 
 LEAD Oxide (Red Lead) ■ ■ ■ ■ ■ 
 
 Oxide Red Lead), c. p Baker Analysed 
 
 Ci 0.003%, 
 
 so, 0.005% ( Typical 
 
 Q trace ( Analysis 
 
 Insoluble matter.'.'. '.'-'..'.'. trace ' 
 
 LEAD Oxide, yellow (Litharge) . 
 " Oxide, -yellow, (Litharge) 
 
 CaO 
 
 c p 
 
 CI 
 
 Nitr 
 
 Baker Analyzed 
 OWo J 
 
 005%f rj, i I 
 "St^naSs 
 
 31 
 
 .18 cc .06 
 .20 cb .04 
 
 .15 cc .04 
 .20 cb .04 
 
 
LEAD Oxide ^^[[(jw Merck Blue Label .20 incl H lb- .SO 
 
 Substances inaolul le i i 
 
 Acetic Acid 
 Carbonatea 
 Copper 
 
 Aluminum 
 Nitrates aod nitnt 
 Chlorides 
 Earths Gj p'lum i 
 alkahex 
 
 e than 25% i 
 ra than 1% I 
 
 than 001%! 
 
 than 002% ^ < 
 ■S3 than 1% / A 
 116% as NjOU 
 002% a- CI I 
 
 ■re than ' -' 
 
 LEAD Oxide [Litharge) Kahlbaum "C.f.A." 100 grra. .95 incl 
 
 " Oxide (Litharge) Kihlbaum "C.f.A." 500 grm. 2.90 incl 
 
 I • in I 
 
 Carbonate 
 
 Chloride 
 
 Residue present after precipitatluf 
 
 Lead (earths and alkalies] 
 Alumina and Iron 0\ide 
 
 NitratPS and lutrite^ 
 
 Solubihti in Acetic Acid conjplet* ' 
 
 LEAD Phosphate c p Baker Analyzed 
 
 " Sulphate, t p Baker Analyzed .... 
 
 CI.,.. —0 001^ \ 
 
 Ye.... 000 ", ( Typical 
 Acetate nne( Analysis 
 
 Nitrate con 3' 
 
 LEAD Sulphide, f p Baker Analyzed . . 
 
 " Tartrate r p Baker Analyzed .... 
 
 LECITHIN, frnm pggs 1.40 
 
 LEVULOSE (Diabetin) Si^hering 
 "LIGROIN (See Kther Petroleum). 
 
 LIME. Chlorinated, Cubes :\Ierck Blue Label ... 
 
 .-Active Chlnrine..vie!da at least 25% by weieht 
 
 LIME WATER, tested reagent Merck Blue Label .... 
 
 LITHARGE (See Lead Oxide, Yellow), 
 
 LITHIUM, metal, pure 
 
 " Acetate, c. p 1 ,75 cb 
 
 LITHIUM Carbonate, c. p Baker Analyzed 
 
 so J . 0SO% ) T.,„j„,, 
 
 Fe 0^n[ >.V^?^L 
 
 AbO. 0.001%f Analysds 
 
 LITHIUM Chloride, c. p Baker Analyzed 
 
 l,.?3cb 
 
 .50 cb 
 
 .07 
 .00 . 
 
 'i lb. 
 
 ,40 
 
 incl 
 
 ,50 ob 
 1.50 cb 
 
 .00 
 .07 
 
 Mlb. 
 
 ,20 
 ,45 
 ,25 
 
 incl 
 incl 
 incl 
 
 1.60 
 
 incl 
 
 
 .35 
 
 incl 
 
 
 
 
 .40 
 
 incl 
 
 1 grm. 
 ' ' 'ji it,: 
 
 
 
 
 1.50 
 
 .65 ' ' 
 
 incl 
 
 1.75 cb 
 2.00 cb 
 
 .09 
 .09 
 
 incl 
 
 LITHIUM Citrate, c. p Baker Analyzed 2.50 cb .08 }4 lb. .75 incl 
 
 Nitrate, c. p Baker Analyzed .25 incl 2.50 cb .OS K lb. .75 incl 
 
 SOa 050% "i 
 
 Fe 002% ( Typical 
 
 AI2O,, 001% / Analysis 
 
 CI 015%' 
 
 LITHIUM Sulphate, c. p 25 incl 2.25 cb .OS 341b, .70 incl 
 
 LITMUS, cubes 25 cc .04 
 
 " powder 40 cc .04 , , . 
 
 LITMUS Merck Blue Label .40 incl 34 ib. 1.25 incl 
 
 Terted for Sensitiveness 
 
 LITMUS, Paper (See Test Paper). 
 
 " Pencils, each with one red and 
 
 one blue point each .20 
 
 " Solution (Indicator) 60 cb .08 
 
 LITMUS Solution, according to Kubel and 
 
 Tiemann in original packages , , Kahlbaum ,500 grm. 1.80 incl 
 
 " Solution, according to Kubel and 
 
 Tiemann in original package?? , , Kahlbaum 1 kilo 3.50 incl 
 
 " Milk (Lakmusmolke kiinpflich 
 
 nach Seitz) Ivahlbaum 100 grm. .25 incl 
 
 " Milk (Lakmusmolkc iiiiiiwtlich 
 
 nach Seitz) Kahlbaum 500 grm. .75 incl 
 
 LOGWOOD Extract .30 incl 
 
 LYCOPODIUM lOcb .03].20cb .OS .... 
 
 LYSOL Lehn & Fink .75 cb .08 1 gal. 5.00 incl 
 
 MAGNESITE Merck Blue Label 40 incl Jj^ lb. .20 incl 
 
 Loss on ignition about 50% 
 
 "MAGNESIUM, metal, powder 25 incl 2.G0 incl 
 
 " " metal, ribbon 45 incl 
 
 " " metal, rods 30 incl 
 
 ° " metal, wire 45 incl 
 
 MAGNESIUM Acetate, c. p Baker Analyzed 90 ch .10 M lb. .3.5 incl 
 
 " Aluminum Sulphate, c, p G.'i cl> .00 "^i lb. .25 incl 
 
 H2 
 
Ounce and pound prices Prica in other sifa pai 
 
 Mdhar or Br^nd por oz. conl. per lb, co.-it. size pkg. per pki 
 
 MAGNESIUM Ammonium Chloride, c. p. Baker Analyzed 35 cb .08 M lb. .15 
 
 Fe _0 0005%, 
 
 CulJ 0.001% ( Typical 
 
 I* none ( Anatysia 
 
 hOi 0.001% } 
 
 MAGNESIUM Ammonium Chloride Merck Blue Label 80 incl ^ lb. .30 
 
 Sulphates leaa than 0.01% as S0]\ 
 
 Heavy metals none J 
 
 Calcium leas than 0.005%,' Guaranteed 
 
 Barium leaa than 0.002%, / Analysis 
 
 Phoaphatea leaa than 0,001% aa PiOel 
 
 Araenatea lesa than 0,005% as AbjOs' 
 
 MAGNESIUM AmmonlumPhosphate, c.p. Baker Analyzed 1.00 cb .08 }.ilb. .35 
 
 " Ammonium Sulphate, c. p. Baker Analyzed 35 cb .08 l-i lb. .15 
 
 " Borate, c. p 15 incl 
 
 " Bromide, c. p 25 incl 
 
 " Carbonate, pure, powder 25 cc .05 
 
 Carbonate, c. p., basic. ... Baker Analy«-d 90 cb .10 ' Hb. .35 
 
 Pe 001%-, 
 
 CI 0.020%,) 
 
 SOi — 0.001%,\ Typical 
 
 CaO none/ Analysis 
 
 AliOi 0.0002%o\ 
 
 Nitrate trace' 
 
 MAGNESIUM Carbonate Merck Blue Label 
 
 Substances soluble in Water,, .not more than 0.75%. 
 
 Sulphates less than 0.0125% aa " 
 
 Substances insolubla in Hydrochloric Acid i 
 
 Chlorides leaa than 0.002% a , 
 
 Barium leas than 0.015% ; 
 
 Calcium leaa than O.f — 
 
 .Aluminum leas than 
 
 HcMvy metals n 
 
 Iron Ies3 than 0.015%' 
 
 MAGNESIUM Chloride, pure, crystals 25 cb 
 
 " Chloride, c. p., crystals. . . Baker Analyzed 30 cb 
 
 NH, tracel 
 
 , 0,0003%! Typical 
 
 75%. 
 SOji 
 
 u,i)15% > V 
 n 0.06%, / ^ 
 m 0.8% \ 
 
 , as SOj ) 
 
 aaPjOsf 
 
 .aAs;OA Gui 
 ^oasNHi/ A 
 n 0,002% I 
 
 n'6,'005%/ 
 
 SOa 0,001%; 
 
 MAGNESIUM Chloride, crystals Merck Blue Laliel 1.00 iiirl U lb. 
 
 Subaiaucoa insoluble in Alcohol 
 
 Sulph.ite3 leaa than 0.01% a 
 
 Phosphatea leas than 0,0010% 
 
 Araenatea lesa than 0,05% a 
 
 Ammonium salts, leaa than 0,0011% as NHj^ Analysis 
 
 Barium lesa than 
 
 Heavy metaja 
 
 Calcium leas than 
 
 MAGNESIUM Chloride, crystals Kahlbaura "C.f.A." 100 gi-rn. .65 
 
 " Chloride, crystals ICahlbaum "C.f.A." 500 grm. 1.60 inci 
 
 CulciiiiiL Oxide and Baryta... none. 
 
 Heavy metals none 1 j 
 
 Amnionium aalts nonaf j-^ ^q ( Cerlified 
 
 l^lpt't**- "°''*'/ granis / Analysis 
 
 Phosphate uonel ■= I 
 
 Araenate none J j 
 
 Insoluble in Alcohol none 
 
 MAGNESIUM Chloride, c. p., fused, lump 
 
 (Ammonia free) 70 cb ,08 Ji lb. .25 incl 
 
 " Chloride, c. p., sticks (Am- 
 
 moniafree) 80 cb .08 M lb. .25 incl 
 
 " " Nitrate, c. p Baker Analyzed .10 incl .50 cb .09 Ji lb. .20 incl 
 
 Nitrate, c. p., fused 15 incl .90 cb .09 }4 lb. .35 incl 
 
 " Oxalate, c. p Baker Analyzed 1.25 cb _ .09 }i lb. .40 mcl 
 
 " Oxide, light, powder 60 incl 
 
 " Oxide, heavy, powder 65 incl 
 
 " Oxide, c p B^ker Analyzed I.OO cb .12 J^ lb. .35 incl 
 
 Fp 007% I 
 
 ^'>' ooK'Kl 
 
 M0> 012%! An^'J'S'S 
 
 CO. 1 3%1 
 
 Merck Blue Label 1.00 incl i.i'lb, .35 incl 
 
 juua™^^,^.. n water not more than 0.75%\ 
 
 =fuh3tancea insoluble la Hj drochlonc Aoid^. , .none 1 
 Sulphates less than 0.375% as SOil 
 
 Chlorides less than 01% as CI r 
 
 Carbonates less than 4% as CO2 \ Guaranleed 
 
 • Nitroeen not more than 0.0056% / Analysis 
 
 Km less thBT. 0,02% ( 
 
 Calcmm lesa than 0.01% I 
 
 IJ^^*™*'*"'' less'thanOwI' 
 
 MAGNESIUM Oxide, c p Baker Special I.aOcb .12 .i^ lb, .45 mcL 
 
 CaO io%1 
 
 re 005% ( Typical 
 
 CI 2jO%( Analysis 
 
 cr, — n 0011!,' 
 
n 025% ) 
 % as &0i/ 
 
 Maker or Brand per oi. tonl. pet lb. cont. si?a plig, per pkg. tonl. 
 
 MAGNESIUM Ovide hep from Sulphates Meick Blue L I r! .30 incl M Ih. -^O '"cl 
 
 1 3 luble n Wate uot m e tha 5 ' 
 
 la n a auluble Hjd o 1 ! > ' 
 
 Chlor d I 
 
 Carbonates I 
 
 ^ ttogen ti 
 
 Ba n 
 
 Tal 1 
 
 IT 
 I less 
 
 I I Ies3 thaa 
 
 MAGNESIUM 0\id jn J s dmm Carbon 
 ate, c. p. (.Lbchka s Mix 
 ture) ... Baker Analvzeil 1.00 cb .10 }-i lb. .35 
 
 MgO 6b 2-3% j 
 
 NaCO, 33 1-3% Tvnical 
 
 r 004%^ i7'i="4 
 
 s( I, 005% i ^"^'^^'^ 
 I 350% 1 
 
 MAGNESIUM Phosphate c p ftriMbic) Baker Analyzed -85 cb .08 i-i ib. .30 
 
 " Pjrophosphate, c. p. . . 1-75 cb .08 
 
 " Sulphate pure cr\ stils 
 
 ll]>soni Silts) 10 cc .0-5 
 
 MAGNESIUM Sulphate r p Baker Analy^^ed 20 cb .08 
 
 r iO 001 ^o\ Analysis 
 
 MAGNESIUM Sulphate Merck Blue Label 50 incl M lb. -20 
 
 Chlonlea Ic s than 0005% aa CI , 
 
 Phosphates lesa than 0016% as PjOsJ 
 4r=!enate6 lesa than 05% as AssUtV Guaranteed 
 
 Heavj metals none /Analysia 
 
 Iron less than 0008% i 
 
 less than 0015% ' 
 
 Kahlbaum "C.f.A." 600 grm. .85 
 
 ipQite none i 
 
 \i e 
 Chiornie 
 
 Heai \ mcta 
 
 SoJiuni Iflir. , 
 
 MAGNESIUM Sulphate, c p , anh\(lrous 45 cb .OS I4 ib. .20 incl 
 
 Tartrate c p Baker Analyzed 2.00 cb .08 H\h. .65 incl 
 
 MALTINE (Diistase of Malt) 65 cb .03 
 
 MALTOSE 60 cb .03 
 
 :*' 
 
 kahlbaum 10 grm. .40 incl 
 
 MANGANESE rnetU coml , Q4'"„ 20 eb .03 
 
 pure fused 30 cb .03 
 
 " Acetate c p Baker Analyzed 1.00 cb .08 U lb. .35 incl 
 
 Borate c p .85 cb .10 
 
 MANGANESE Carbonate, ( p Baker Analyzed 70 cb .10 }i lb. .24 incl 
 
 F 002 "a *"»'I"'» 
 
 M ii„ I 1 ( irl onate trace' 
 
 MANGANESE ( hloride c p Baker Analyzed 40 cb .08 =i lb, .20 incl 
 
 Fe 001% 1 
 
 SOa 001% ( Typical 
 
 CdU 005% ( Analysis 
 
 Free CI trai-e' 
 
 MANGANESE Chloride ^f. m1 i:!,,. Lubcl 50 inc! Ji lb. .20 inc! 
 
 Sulph-ites leal th r 
 
 Chlorine Usa th r 1 ' ,' 
 
 Calcinm I ■ . ■ : ..| 
 
 Iron Iti I. iiULiijij,'., Guaranleed 
 
 Other foreign metals 
 Salts of fttagaesium and 
 the alkalies r 
 
 MANGANESE Chloride Kahlbaum "C.f.A." 
 
 Frep thlonue 
 '^ulphate 
 
 a 0.033%! 
 ■lan 0.2%/ 
 ahU 
 
 ___^^^ 1^' In 10 V C 
 
 Other hpav-v njetaH """" noni / '-'"''"'' / ^ 
 
 A-lkaliL present atttr I 1 
 
 prw ij>itating J I 
 
 M.ngmese 3 2 ma ' ^ 
 
 MANGANESE Dioxide, native, granular 
 
 " Dioxide, native, powder 
 
 " Dioxide, c. p. {Carbon free) Baker Analyzed 
 
 " Dioxide, tested reagent. . . . Merck Blue Label 
 
 " Metaphosphate, solution, 
 
 tested reagent Merck Blue Label 1 .25 
 
 ° " Nitrate, c. p Baker Analyzed 
 
 34 
 
 10 cc 04 
 
 ' 'i ilV. 
 H lb. 
 
 
 
 
 
 
 .75 cb .06 
 -50 incl 
 
 '20 
 
 incl 
 incl 
 
 .25 incl 
 1.25 sb .15 
 
 M lb. 
 H lb. 
 
 .40 
 .40 
 
 incl 
 inc! 
 
apks. 
 
 per pkg. 
 
 conl. 
 
 )ilb. 
 I'i lb. 
 ViVo. 
 
 .20 
 .35 
 .65 
 
 incl 
 incl 
 incl 
 
 lOgrm. 3.00 incl 
 
 Maker or Brand per oz. conl, per lb, conl. 
 
 MANGANESK Oxide, c. p., hydrated Baker Analyzed .50 cb .08 
 
 Oxide, c. p., brown 1.00 cb .08 
 
 Phosphate, c. p Baker Analyzed 2.00 cb .10 
 
 ^^ Sulphate, pure, crystals 38 cb .09 
 
 Sulphate, c.p Baker .\n,ilvzed 4.5 cb ,07 K tb. .20 incl 
 
 r^e 0.002%i 
 
 Cl., 0.005%( Typical 
 
 \^'~^ 0.050%/ Analysia 
 
 ■>J'i trace,? 
 
 MANGANESE Sulphate Merck Blue Label 60 incl U lb. .2.5 mcl 
 
 Chlorides leas than 0.002% as CK 
 
 Substances reducing Potaaaiuni \ 
 
 Permanganate at roost a trace / 
 
 iTOi less than 0-0008% \ f..,„„„,„„^ 
 
 Zinc less than 0,2% /?"V? 
 
 Other foreign metals none / *"*'>'s's 
 
 Salts of Magnesium and | 
 
 the alkalies not more than 0.033% J 
 
 Calcium less than 0.03%-^ 
 
 MANGANESE Sulphate Kahlbaiim "C.f.A," 100 .-rn, ..iO incl 
 
 Li"e Kahlbaum "C.f.A." .jOO grm. 1 .1.5 incl 
 
 Zinc."'.!![!^!!!!!;] nonel 1 
 
 Iron none/ , / 
 
 Other metals none > ^^ "^ V C^ffie*! 
 
 Chloride :..;:: .'trace i ^^-^"'^ i Analysis 
 
 -Mkahnoro^iduepresentaftcrpre- J J 
 
 cipifcitiiiE Manganese 4 4 mg.' 
 
 MANGANESE Sulphide, c. p 2.50* OS U lb 73 incl 
 
 Vj^SSi^rS,'^'^'^ ^''""''''' °- P Baker Analyzed 2.80 cb .08 >'f lb. .80 incl 
 
 mISSosIv.; ^"^ ■°''"-' '""' 
 
 MARBLE LUMPS (See Calcium C'ar- 
 
 bonate 
 
 MELETOSE {See Raffinose) 
 
 MERCURY ^ 
 
 " redistilled 90 ^JK 
 
 ■■■■, ■ Merck Blue Label 1.60 inci I4 lb. ..50 incl 
 
 foreign metals none 
 
 MERCURY Acetate, c. p. (ic) 2.-5 incl 2.50 gb .ftS i-r lb. .75 incl 
 
 Acetate, c. p. (ous) 30 incl ' 
 
 ' Bichloride, crystals (Corrosive 
 
 Sublimate) 90 cc ,04 
 
 " Bichloride, powder (Corrosive 
 
 Sublimate) 90 cc ,04 , , . . 
 
 " Bichloride, crystals, c. p Baker Analyzed .20 incl 1.75 cb .06 ^, lb 60 " incl 
 
 Fe 0,0005%'j 
 
 SOs — 0,001%( Typical 
 
 Mercurous Salt trace ( Analysis 
 
 Nonvolatile matter 0,004%,' 
 
 MERCURY Bichloride Merck Blue Label .25 incl }^2 lb. 1.20 
 
 Foreign metals not precipitated ' 
 
 by Hydroeen Sulphide less than 0,0' 
 
 Arsenic less than O.OOt 
 
 Mercurous Chloride and other substances 
 
 insoluble in Ether no 
 
 MERCURY Bichloride Kahlbaum "C.f.A." 100 grm. 1.10 incl 
 
 " Bichloride Kahlbaum "C.f,A," 500 grm .'J 60 incl 
 
 J^^J^I^le in Ether tra«e) i„ ^q f Certified 
 
 Forergnsubstances,'unweiehable\ ^''^"'^ \ -^nBlysis 
 
 MERCURY Bromide, c. p .55 incl 
 
 " Chloride, powder (ous) 95 cb .06 ' ' 
 
 Chloride, c. p, (ous) Baker Analyzed .20 incl 1.75 cb ,06 ij lb .60 incl 
 
 ■80 jg ,0.5 
 
 Nonvolatile matter 0.0005% 
 
 Fe 0.0002% 
 
 Typical 
 Analysis 
 
 Mercuric Salt trace I 
 
 MERCURY Iodide, e. p., red (ic) 30 incl 
 
 " Iodide, (ous) 30 incl 
 
 .,, Baker Analyzed .15 incl 1.50 gb .12 M lb. .45 incl 
 
 003% I 
 
 Tb ""nonl T^-'-' 
 
 SO nonel Analysis 
 
 f l' 0001%) 
 
 "MERCURI Nitrate c p (ous) .. Baker Analyzed .15 incl 1.50 gb .12 i^ lb. .45 incl 
 
 Nonvoht It mitter 003% ) Typical 
 
 Mercur Silt tracef AnnlvniH 
 
 Fe 0001% i '^"^'J^s's 
 
 'MERCURY Nitrate (ou?) .. Merck Blue Label .30 incl i-^lb. 1..50 incl 
 
 Nonvolatile matter, , . .less than 0.025% | Guaranleed 
 Mercuric salts at most a trace 1 Analysis 
 
MERCURY Oxide, c p , red (ic) . . . Baker Analyzed .20 inel 1.70 cb .06 M lb. .60 incl 
 
 Nouvcjla tile matter " 
 
 Fe 
 Nitrate 
 
 Ph 
 
 CI 0001% I 
 
 SOa 001%/ 
 
 \rERCURY Oxide, leJ (ic) ... Merck Blue Label .25 
 
 Nonvolatile matter leas than 025% 1 
 Chlorides lesa than 003% aa CI ( Guaranteed 
 
 <^tilphote> lesa than 175% as SOs ( Analysis 
 
 Nitrate, leia than 016% aa NsOt; 
 
 MERCURY Oxide, c p , \elIow, (ic) Hy- 
 
 drated Baker Analyzed .20 
 
 Nonvolatile matter 0. 010% J 
 
 Analysis 
 
 SCh 0.250%) 
 
 MERCURY Oxide, yeilow (ic) Merck Blue Label .25 incl M lb. 1.40 
 
 Nonvolatile matter less than 0,025%"1 
 
 Chlorides leaa than 0.003% as CI ( Guaranteed 
 
 Sulphates less than 0.175% as SO, j" Analysis 
 
 Nitrates less than O.OH% as N;0 J 
 
 MERCURY Oxide, precipitated (ic) Kahlbaum "C.f.A." 100 grm. 1.15 
 
 " Oxide, precipitated (ic) Kahlbaum "C.f.A." 500 grm. 3.70 
 
 Nonvolatile matter unweighable i 1 
 
 SSI;'';:;:::::;:;::::;::::S™ ■"'» [<i"ff 
 
 Sulphurio .loid nonel «'"™ I »■»»•'• 
 
 lion none' ' 
 
 MERCURY Oxide, c. p., (ous) 2.00 ob .07 ^ lb. .65 
 
 MERCURY Potassium Iodide Merck Blue Label .65 incl Moz. .25 
 
 Tested for Solubility 
 
 Sulphate, c. p. (ic) Baker Analyzed 1.75 cb .06 141b. .60 
 
 Sulphate, c. p. (oils) Baker Analyzed 2.00 cb .06 M\h. .65 
 
 Sulphide, c. p. (ic) 1.50 cb .06 K lb. .45 
 
 MERCURY Thiocyanate, c. p. (ic) Haker Analyzed .25 incl 2.50 cb .07 H lb. .75 
 
 METAL, Devarda's Alloy, for reductions. . Baker Analyzed 1.50 incl l-i lb. .45 
 
 \ Typicol 
 
 Copper 50%l 
 
 .^luniinuni 43%t 
 
 METAL, Devarda's Alloy Merck Blue Label .35 incl 3i lb. 1.00 
 
 Nitrogen not more than 0.0056% 
 
 METAL, Rose's Alloy, fusible Baker Analyzed .30 incl 3 00 incl M lb. .95 
 
 2 part?"^ 
 
 Lead 1 part I Typical 
 
 Tin 1 part [ Analysis 
 
 M. P 93.75''Cj 
 
 METAL, Wood's Alloy, fu.9iblu Baker XmxXyv. 
 
 2 part 
 Ipar 
 
 , 2 parts I r 
 
 ,_ Typical 
 . I Analysis 
 
 . - pari I ' 
 
 H. p fio .rr' 
 
 METAPHENYLENEDIAMINE, pure 
 
 crystals 85 cb .OZ 
 
 METAPHENYLENEDIAMINE HYDRO- 
 CHLORIDE Merck Blue Label 1.00 incl K oz. .30 
 
 Inorganic impurities .less than 0.05% 
 
 METHYL Acetate, c. p Baker Analyzed .30 incl 
 
 " Iodide 65 gb .05 
 
 " Orange, true indicator 50 incl 
 
 " Orange, indicator Merck Blue Label .50 incl 14 oz. .20 
 
 Tested for Sensitiveness. 
 
 METHYL Red, indicator Merck Blue Label 3^ oz. 1.25 
 
 " Red, indicator Merck Blue Label 15 grii. ,50 
 
 TcffterJ for Sensitiveneaa. 
 
 METHYLENE Iodide 1.25 gb .05 
 
 METOL, HaulTs 65 incl 
 
 MICROCOSMIC SALT (See Sodium ,im- 
 
 monium Phosphate) 
 
 M LK SUGAK (See Lactose) 
 
 MOLYBDENUM, metal powder, 95% 40 cb .03 
 
 " Wire.No. 28B&Ssauge Per loot .30 
 
 " Oxide, pure (mono) 1.00 cb .03 
 
 NAHRSTOFF, Hcydens, in original tins ijt lb. 1.50 
 
 NAPHTHALENE, white, sublimed, flakes 10 oc .04 
 
 NAPHTHALENE, c. p.. purified by Alcohol Baker Analyzed 75 cb .09 , 
 
 NAPHTHOL (alpha) 6 cb .08 
 
 " (.alpha) recrystallized 20 cb ,04 2.00 cb ;08 
 
 " (beta) resublimed 10 cb ,03 .50 cb .0,S 
 
 " NitroMo-bcta 1,00 in<l 
 
NAPHTHYLAMINE (alpha), pure 
 
 (beta), pure 
 
 '' Chloride (alpha), pure 
 
 Chloride (beta!, pure 
 NESSLER'S TEST SOLUTION . 
 NICKEL, metal, 98-9J%, cubes or granular 
 metal, pure, sheet such as used 
 for making boats for the di- 
 rect combustion o iron and 
 steel, No. 26 B & S gauge.... 
 
 " metal, wire 
 
 " metal, pure 
 
 I' metal, c. p. (Cobalt free) 
 
 metal, for anodes, cast in follow- 
 ing sizes: 200x100x4 mm. 
 
 and 200 X 100 x5 mm 
 
 " metal, for anodes, forged, 200 x 
 
 100 x2 mm 
 
 NICKEL Acetate, c. p 
 
 " Ammonium Sulphate, pure 
 
 crystals 
 
 " Ammonium Sulphate, c. p 
 
 Carbonate, c. p 
 
 " Chloride, pure crystals. . - 
 NICKEL Chloride, c. p 
 
 .30 cb .04 
 
 .40 cb .03 
 
 .30 cb .03 
 
 .25 cb .03 
 
 .15 incl 1.10 incl 
 MOcc .04 
 
 .20 
 .30 
 
 no I 2.00 
 ncl 3.00 
 
 ncl .... 
 
 Baker Analyzed 
 
 Baker Analyzed 
 Baker Analyzed 
 
 Co . 
 
 . 0.0001%"! 
 none* 1 
 0.02% t A 
 
 Baker Analyzed 
 
 1.00 i 
 
 incl 1.60 cb 
 
 20 cc .04 
 
 75 cb .08 
 
 incl 2.50 cb .10 
 
 75 cb .08 
 
 1.50 cb .08 
 
 NICKEL Chloride, c. p. (Cobalt 'free). 
 
 ° " Nitrate, c. p 
 
 Nitrate, c. p., (Cobalt free) 
 
 " Oxide, c. p., green 
 
 0.002%^ 
 
 Baker Special 
 Baker Analyzed 
 Baker Special 
 Baker Analyzed 
 
 incl 
 incl 
 
 Co.. 
 Cu.. 
 
 SO,i 0. 150%,' 
 
 NICKEL Oxide, black, pure 
 
 " Sulphate, pure, crystals 
 
 " Sulphate, c. p 
 
 Fe 0005%-\ 
 
 0.001%' 
 
 NICKEL Sulphate, c. p. (Cobalt free) 
 
 NINHYDRIN 
 
 NITROBENZ.ALDEHYDE, Ortbo, tested 
 
 reagent 
 
 " Ortho, tested 
 
 reagent 
 
 NITROBENZENE, (solvent) 
 
 NITROBENZOL, twice rectified, (Oil of 
 
 Mirbane) 
 
 NITRON, tested reagent 
 
 NITROPHENOL, Ortho, tested reagent.. 
 " Para, tested reagent.. . . 
 
 NITROSOBETANAPHTHOL 
 
 " tested reagent 
 
 NORMAL SOLUTIONS (See Solutions)... 
 NUTROSE (Casein-Sodium) in original 
 
 package 
 
 OIL, Aniline (See Aniline) 
 
 " Bergamot, hand pressed 
 
 " Cajepat, rectified 
 
 " Cedar, for use as a clearing agent in 
 
 microscopy 
 
 " Cedar, Special, for ^^■(■ a-: ■ Ii'Mrinir 
 agent in mid -i . . i 'n . 'in- 
 teed to mix v. 1 1 1 ■ i ■ -ll 
 
 proportions \\ iiln-uL cluudi- 
 
 Baker Analyzed 
 
 Baker Special 
 
 Merck Blue Label 
 
 Merck Blue Label 
 Baker Analyzed 
 
 Merck Blue Label ■ 
 Merck Blue Label 
 Merck Blue Label 
 
 Merck Blue Label 
 
 .20 cb .03 1.25 cb .08 
 
 26 cb .09 
 
 1.50 cb .08 
 
 4.00 
 
 nd 
 
 .55 
 
 nr.l 
 
 .55 
 
 TlH 
 
 1.00 
 
 ncl 
 
 1. 00 
 
 ncl 
 
 7.50 cb .OS 
 1.25 cb .08 
 
 Cedar, Special for Immersion Ob- 
 jective.? 
 
 Cedar, Special for Immersion Ob- 
 jectives Zeiss. . 
 
 CJoves, twice rectified 
 
 1.50 cb .OS 
 
 cb .03 3.00 cb .OS 
 
 }i lb. .60 incl 
 
 }.£ lb. .25 incl 
 M lb. .75 incl 
 
 14 lb. .45 
 
 li lb. .35 incl 
 ' 'ii \h. .45 ' ' ' inci 
 
 i.( lb. .45 
 
 t'o erm. .25 incl 
 M oz. .75 incl 
 1.5 grn. .25 incl 
 
 14 oz. .60 incl 
 lioz. .20 incl 
 H oz. .20 incl 
 
 'I'oz. .30 incl 
 ij lb. 1.00 incl 
 
 .25 cb .0.3 2.75 cb. 
 
 Hoz. .30 incl 
 
Maker or BranJ per oz. conl. per lb. conl, size pkg. per pkg, cotiti 
 
 OIL Cottonseed 15 cb .08 
 
 * " Linseed, raw 20 cb .08 
 
 °" Linseed, boiled 20 cb .08 
 
 " Mirbane (See Nitrobenzole) 
 
 " Olive, Lucca Cream 60 cb .08 1 gal. 3.50 incl 
 
 " Origanum, Creticum 30 ob .03. 4.00 cb .08 
 
 " Paraffine. white, pure .20 cb .08 
 
 " .Sperm 20 cb .08 
 
 " Turpentine (Sec Turpentine) 
 
 ORCIN. pure crystals 1 grm. .15 incl 
 
 ORPIMENT, (See Arsenic Sulphide) 
 
 ORTOL 75 incl 
 
 OXGALL, neutral, freshly precipitated for 
 
 bacteriological use J2 lb. 2.25 incl 
 
 •"OXONE," for generating Oxygen 2 lb. 1.50 incl 
 
 "OXYGEN, gas, 99% pure, as used in cal- 
 orimetry, carbon combustions 
 in steel, etc. Guaranteed to 
 be free from the Oxides of Car- 
 bon, Hydrocarbon.'?, Chlorine 
 and other deleterious sub- 
 stances. Furnished in seam- 
 less steel cylinders. Made in 
 accordance with the require- 
 ments of the Interstate Com- 
 merce Commission The price 
 includes one cylinder, con- 
 taining 70 cu. ft. at 1800 lbs. 
 pressure at 68° F. These cyl- 
 inders are returnable for re- 
 filling only 17.80 incl 
 
 "OXYGEN, gas, 97%, at 1000 lbs. pressure 40 ga!. 2.25 cyl. 6.00 
 
 gas, 97%, at 1000 lbs. pressure 100 gal. 5.00 cyl. 12.00 
 
 " gas cylinder connections 1-75 
 
 These cylinders returnable for 
 credit or refilling. 
 
 OZOKERITE, black 25 incl 
 
 PALL.4DIUM, sheets or wire Merck Blue Label 1 gr. .30 incl 
 
 Copper and Iron none 
 
 PALr-AI>IUM, black Merck Blue Label 
 
 " black Merck Blue Label 
 
 Copper and Iron none 
 
 PALLADIUM Chloride, tested reagent.. . Merck Blue Label 
 
 " Chloride, tested reagent . . . Merck Blue Label 
 
 " " Nitrate, tested reagent Merck Blue Label 
 
 " " Nitrate, tested reagent Merck Blue Label 
 
 " Sodium Chloride, tested re- 
 agent. , Merck Blue Label 5 gr. .65 
 
 " Sodium Chloride, tested re- 
 agent Merck Blue Label 15 gr. 1 .75 
 
 PALM Oil Soap cake .10 
 
 PANCREATIN, active 60 incl 
 
 PAPER, (See Test Paper) 
 
 PARAFFINE, domestic, melting point 
 
 about 43°C 15 incl 
 
 " domestic, melting point 
 
 about 52 "C 15 incl 
 
 (For imported Paraffine 
 melting at other teinpera- 
 turcs, see Imbedding Media.) 
 
 PARA-AMIDO-ACETOPHENON 4..50 cb. 03 
 
 PARA-DIMETHYL-AMIDO-BENZALDE- 
 
 HYDE for I'lhrlich'.s test 10 grm. 1.00 
 
 PARA-PHENYLENEDIAMINE, pure cryst 80 gb ,04 
 
 Hydrochloride I.OOgb O-j 
 
 "PARALDEHYDE 75 cb .09 
 
 PARCHMENT Paper, thin 40 incl 
 
 " Paper, medium 40 incl 
 
 " Paper, heavy 40 inci 
 
 SPT. 
 
 1..™ 
 
 incl 
 
 15 gr. 
 
 4.25 
 
 incl 
 
 5 gr. 
 
 1.10 
 
 incl 
 
 l.T rr. 
 
 3.00 
 
 inci 
 
 hfr. 
 
 .85 
 
 incl 
 
 1.5 gr. 
 
 2.25 
 
 incl 
 
Mdker (ir Brand p«r oi. cont, per lb. cont. sue jiktt. per pkg. cont, 
 
 PARCHMENT Paper, for dialyzing, No. 0, 
 slifiet 26 X 39 in., as used in 
 the manufacture of biolog- 
 ical_ products such as Anti- 
 toxin, etc., and not to be 
 confused with the parch- 
 ment paper of commerce sheet ..^0 incl 
 
 PEPSIN, powder or scales, U. S. P 3.5 ch .04 
 
 PEPTONE, for preparation of culture 
 
 media Witte 30 cb .0.3 3.25 cb ,00 
 
 for preparation of culture 
 media, in original tins of 10 
 
 kilos \\itte 67.50 incl 
 
 " from meat, dry 25 cb .04 
 
 Silk (Seiden peptone), for Ab- 
 
 derhalden Test 1 grm. .50 incl 
 
 Silk (Seiden peptone), for Ab- 
 
 derhalden Test 5 grm. 2.00 incl 
 
 " Silk (Seiden peptone), for Ab- 
 
 derhalden Test 10 grm. 3.75 incl 
 
 " Placenta, for Abderhalden 
 
 Test 1 grm. 5.50 inc! 
 
 PETROLATUM, white 25 incl 5 lb. 1.10 incl 
 
 yellow 15 incl 5 lb. .50 incl 
 
 "PETROLEUM. Ether (See Ether) 
 
 PHENACETOLIN, Indicator Merck Blue Label i oz. .25 incl 
 
 " Indicator Merck Blue Label J^oz. .75 Incl 
 
 Tested for.. .Seositiveneaa 
 
 PHENOL (See Acid Carbolic) 
 
 PHENOLPHTHALEIN, pure 25 cb incl 2.00 cb incl 
 
 PHENOLPHTHALEIN, Merck Blue Label .35 
 
 Tested for... Proper solubility in AicohoU 
 
 Tested for Sensitiveneaa I Guaranteed 
 
 Nod volatile matter leas than 0.1% C Analysis 
 
 Fluorane none ' 
 
 PHENYLHVDRAZINE .25 gb .07 2.75 gb .14 
 
 PHENYLHYDRAZINE Merck Blue Label .55 incl K oz. .25 incl 
 
 Tested for Proper solubility 
 
 PHENYLHYDRAZINE HYDROCHLORIDE 35 gb ,07 
 
 PHENOLSULPHONEPHTHALEIN, in 
 
 original box of 10 ampoules 1.00 incl 
 
 PHLOROGLUCIN, for Gunsburg's reagent 4.00 incl 15 gr. .25 incl 
 
 PHLOROGLUCIN Merck Blue Label i^ oz. 1.25 incl 
 
 " Merck Blue Label 15 gr. .25 incl 
 
 PHOSPHORUS, red, amorphous 15 cb .04 1.20 cb .09 
 
 * " yellow, sticks 15 en .04 .90 incl }i lb. .30 incl 
 
 * " yellow, sticks, ^" for gas 
 
 analysis 20 incl 2.00 inc! M lb. .65 incl 
 
 * " Oxychioride 20 incl 2.00 gb .15 i^ lb. .75 incl 
 
 * " Pentachloride 15 incl 1.50 gb .15 i| lb. .45 incl 
 
 * " Trichloride 15 incl 1.50 gb .15 M lb. .45 incl 
 
 PITH, for imbedding pkge .10 incl 
 
 PLASTER PARIS (See Calcium Sulphate) 10 cc .04 
 
 PLATINUM, metal, foil or wire (Prices on 
 
 application) 
 
 PLATINUM, metal, sheets or wire Merck Blue Label 1 gr. .28 incl 
 
 Foreign metala at moat a trace | Guaranteed 
 
 Silver none I Analysia 
 
 PLATINUM, black Merck Blue Label 5 gr. 1.50 incl 
 
 Foreign metals at most a trace | Guaranteed 
 
 Silver none t Analysis 
 
 PLATINUM.Sponges.set in rings each .SO incl 
 
 Asbestos, 5% 4.50 mcl 
 
 Chloride (ic) 22.50 cb .04 
 
 " Chloride, c. p., solution 5% 2.00 mcl 
 
 " Chloride, c. p., solution 10% 3.25 mcl 
 
 PLATINUM Chloride Merck Blue Label i oz, 5.00 mcl 
 
 " Chloride Merck Blue Label 15 gr, 1.75 incl 
 
 Tested for .Solubility in Absolute Alcoholj 
 
 Metiila aoluble in Nitric Acid.... not more than 0,25%f Guaranteed 
 
 Sulphates leas than 0075% as SO, ■ Analysis 
 
 Nitrates less than 0.08% as NjOtl 
 
 Barium Salts leas than 0.002% as Bal 
 
 PLATINUM Crucibles, Dishes (See Appa- 
 ratus catalogue) 
 
e pkf. 
 
 Der (.ke. 
 
 ».t. 
 
 15 gr. 
 
 1.40 
 
 inci 
 
 1.5 gr. 
 
 1.4.5 
 
 incl 
 
 PLATINUM Potassium Chloride (ic) (Po- 
 tassium Cliloroplatinate) 
 
 " Potassium Chloride (ous) (Po- 
 tassium Chloroplatinite) . . . 28.50 
 
 It is recommended that quotations on 
 Platinum and Platinum salts be secured in 
 advance on account of market fluctuations 
 in price. 
 
 POIRRIER'S BLUE, C4B, indicator Merck Blue Label 1.25 incl 'i oz. -40 incl 
 
 Tested for.. Bonaitivcneaa 
 
 ♦POTASSIUM, metal, balls 1.25 gb .10 15.00 gb .18 Ki oz. .35 gb .08 
 
 " Acetate, purified, granular, 
 
 grade recommended for 
 preparation of Kaiscrling 
 
 solution ; 35 cb ,08 
 
 POTASSIUM Acetate, c. p Baker Analyzed 65 cb .09 J4 lb. .24 incl 
 
 Fc — 0.01)04% 1 
 
 ^v..-.v.:::::::::;:::;:; toZi *-'^^'^ 
 
 SO3 0.001%! 
 
 POTASSIUM Acetate, c. p., anhydrous... Baker Special .15 incl .90 gb .00 ijMb. .35 incl 
 
 POTASSIUM Acetate Solution, about 33% Merck Blue Label 50 incl '4 lb. .20 incl 
 
 Clilori.lp^ . .Kv3 l,l,;iii O.UOll,-, ';^,:i^ CI 1 
 Sulphates . .li\ss ihaii O.Or^ as SOaf r. , j 
 
 Heavy metala none Guaranteed 
 
 rron..",.......;:;,iea3than*6."d6015%t' Analysis 
 
 Calcium leas than 0.002% 1 
 
 POTASSIUM Ammonium Sulphate, c. p. . Baker Analyzed 45 cb .{ 
 
 " Antimonate, c, p 1.30 cb .( 
 
 " Antimonate Merck Blue Label .20 inrd 
 
 Teswd fnr. , .Suitability as a reagont for Sodium 
 
 POTASSIUM Arsenate, c. p Baker Analyzed .80 cb .07 H lb. .30 incl 
 
 <. .20 
 
 incl 
 
 >. .40 
 
 incl 
 
 ., 1.10 
 
 incl 
 
 SO; — O.001%( Tj-pica! 
 
 CI 0. 001% ( Analyag 
 
 CaO 0.010%' 
 
 POTASSIUM Arsenite, c. p Baker Analyzed 
 
 Fe 0.0015%! 
 
 0.001%V Typical 
 
 0.002%/" Analysis 
 
 CaO 0,001%,' 
 
 POTASSIUM Bicarbonate, c. p Baker Analyzed 
 
 Fe 0.0005%! 
 
 . __ 0.001% 
 
 CaO 0.005% 
 
 CI 0.002%! 
 
 Typical 
 Analysis 
 
 SOi —0,001%,' 
 
 POTASSIUM Bicarbonate Merck Blue Label 
 
 Sulphates lesa than 0.004% aa 
 
 Chlorides less than 0,00075% a 
 
 Nitrates leaa than 
 
 Calcium less than 6,001% V Guaranteed 
 
 Aluminum lesa than 0,04%, / Analyais 
 
 Heavy metals none! 
 
 Phoaphatea less than 0.004% aa PiOsl 
 
 Iron leaa than 0,0008%, 1 
 
 Residue on ignition 69%.' 
 
 POTASSIUM Bicarbonate Kahlbaum "C.f .A," 100 grm. .45 incl 
 
 " Bicarbonate Kahlbaum "C.f. A," 500 grm .SO incl 
 
 Chloride 
 
 Sulphat* 
 
 Nitrate 
 
 Alumina 
 
 Heavymetals (Iron, etc) 
 
 Silica 
 
 Residue on ignition BO 04' 
 
 Content. "" "" 
 
 Moisture. 
 
 „\ In 10 I C 
 lOiitY eranis ,'' A 
 
 1) ) 
 
 POTASSIUM Bichromate, crystals 15 cc .04 
 
 " Bichromate, powder 20 cc .04 
 
 . —0 001%, 
 it^^ -^l'^%\kZly%. 
 
 POTASSIUM Bichromate,..'.'. '.V. 7 Merck Blue Label , . , .60 
 
 Sulphates less than 0,029%o aa SOj-J 
 
 Chlorides less than 0,0025% aa CI ( Guaranleed 
 
 Alumina ieaa than 0.1% as Al ( Analysis 
 
 Alkaline earths. ..less than 0,005% as Ca ' 
 
 POTASSIUM Bichromate Kahlbaujn "C.f.A." 
 
 40 
 
 Bichromate, c. p., crystals, . Baker .Anatyzed 45 cb .07 14 lb. .20 incl 
 
 Bichromate, c. p., powder , , Baker Analyzed .50 cb ,07 ^4 lb. .20 incl 
 
Maker or Brand per oz. cunl. pur lb, cunt. s':ie pkg. per pk) 
 
 POTASSIUM Bichromate Kahlbaum "C.f.A." .500 grm. 1.00 
 
 Content found 09,97% ■ j 
 
 Sulphatea.. 
 
 Chlorides 
 
 Alkaline earths,. 
 Alui ■ 
 
 -- „ '\- 
 
 POTASSIUM Bichromate, c. p., fused .75 cb .07 ^4 lb. .25 iucl 
 
 " Biniodate Merck Blue Label .85 inol }i oz. .-^0 incl 
 
 Chlorates.... less than 0.15% as Cl^Ot 
 
 POTASSIUM Binoxalate, e. p Baker Analyzed .50 cb .08 U lb. .20 incl 
 
 " Bisulphate, pure, crystals .35 cb ,09 
 
 Bisulphate, c. p., crystals, . Baker Analyzed 40 cb .08 34 lb. .20 incl 
 
 Fe 0.0007%) 
 
 SiOs 0.005%/ T, . , 
 
 CI -0 001%l I^'",*^"'. 
 
 AJ=0, -0.001%t ^""'''^'^ 
 
 Acidity (HsSO^) 36,5%) 
 
 POTASSIUM Bisulphate Merck Blue Label 60 incl I-4' lb. .25 incl 
 
 Heavv metals..,.,, none) #-^ . ^ 
 
 Chloridea leas than 0,002% a. 01 f ?ri?=.?= 
 
 Arsenic leas than 0,0015% ) Analysis 
 
 POTASSIUM Bisulphate, crystals Kahlbaum "Cf.A." 200 grm, .65 incl 
 
 Content.... found 100,01%i 1 
 
 Arsenic nonet. In 10 ( Certified 
 
 Heavy metals. ,,,.,, .none ( gcarna /Analysis 
 Chlorides slight trace' .' 
 
 POTASSIUM Bisulphate, e. p., fused 
 
 (Pyro) Baker Analyzed .GO cb ,07 U lb. .22 incl 
 
 Fe 0004%) 
 
 Typical 
 
 SiO: —0.001%/ 
 
 CI -OOOfll^^Analvsi 
 
 Acidity (HjSOi) 35 2% t A"^'*^'' 
 
 CaO none? 
 
 POTASSIUM Bisulphite, granular 40 cb .09 
 
 " Bisulphite, c. p Baker Analyzed 75 cb .OS Ji lb. .25 incl 
 
 Fe 0.0003%\ 
 
 AhOs 0.0002%i 
 
 CaO —0.001% I Typical 
 
 MgO —0. 001% / Analysis 
 
 01 — O.001%l 
 
 ,fO- (available) 48.4%/ 
 
 POTASSIUM Bisulphite, meta Merck Blue Label 80 incl M lb. -30 inc! 
 
 Chlorides less than 0,002% as CI ) Guaranteed 
 
 Heavy metals None)- .__,„„i„ 
 
 Arsenic less than 0,0002% ) *"a'J'3's 
 
 POTASSIUM Bitartrate, crude (Argols) 10 cc M 
 
 " Bitartrate. pure, powder 
 
 (Cream Tartar) 35 cc .04 
 
 POTASSIUM Bitartrate, c. p., crystals... Baker Analyzed 75 cb .09 M lb. -25 incl 
 
 " Bitartrate, c. p., powder. . . . Baker Analyzed .80 cb .09 }4. lb, .25 incl 
 
 POTASSIUM Bitartrate Merck Blue'Label .20 incl ,'^lb. I.OO incl 
 
 Jloisture none i 
 
 Chlorides less than 0.002% as CI / 
 
 yulphat«s less than 0.035% as SO3 \ Guaranteed 
 
 nonium / A nn I vai s 
 
 mpounds. . .less than 0,00175% as NH, /Analysis 
 
 Ammonium 
 
 compounds ,. , 
 
 Calcium less than 0.02S% i 
 
 Heavy naetals, . 
 
 POTASSIUM Borate, c. p Baker Analyzed 1.00 cb .08 }i lb. .35 
 
 Bromate 75 cb .09 
 
 Bromate, c. p Baker Analyzed .25 incl 2.25 cb .07 }i lb, .75 
 
 Bromide nonei 
 
 COi none \ Typical 
 
 CI -0.001%(Analysis 
 
 Sdj Qone,' 
 
 POTASSIUM Bromate Merck Blue Label .30 incl K lb. 1.00 
 
 Potassium Bromide, . less than 0.04% 
 
 " Bromide, crystals or powder 51 cc .04 
 
 " Bromide, (, p Baker Analyzed .85 cb .07 K lb, .25 
 
 ■^Oj , ' Typical 
 
 Br mate roc' 
 POTASSIUM Bromide Alerck Blue Label 1.00 incl H lb. .35 
 
 Potassium Carbonate less than 0,04% \ 
 
 Potassium Bromate leas than 0,014% I 
 
 Heavy metals — none f 
 
 Sulphate less than n.tini?.-.', ■>-- -n, ^.uarantecd 
 
 Barium salts less tlia^i h mm." . I.i .Analysis 
 
 Iodides ., |h<--, 1 !,;,i, n I' . 1 1 
 
 Excess of Potassium 1 
 
 Chloride not moix- thiin 1.:-.',./ 
 
 POTASSIUM Carbonate (Pearl Ash) 90';; 12 cb .08 
 
 " Carbonate, pure, powder is t'b Mb 
 
 41 
 
COMPANY 
 
 POTASSIUM 
 
 
 p cr\bt'ils . . 
 0004% , 
 
 
 
 re 
 
 
 
 Aid 
 
 0002% 
 
 
 
 toiU 
 
 
 .Typical 
 
 
 
 
 ^Analysis 
 
 
 
 
 
 
 
 
 POTASSIUM Carbonate 
 
 
 Merck Blue Label 
 
 
 
 
 
 
 Chlorides 
 
 leas than 0.002?; 
 
 ,asCl) 
 
 
 Sulphates 
 
 less than 0075% 1 
 
 as so J 
 
 
 Nitrates 
 
 
 
 
 Potassium Cjanide less than 0.0-18%CNl 
 
 
 
 less than 0.03%S \Guaranteed 
 
 
 Sulphite? 
 
 less than 008% 1 
 
 IS SOi /Analysis 
 
 
 Thio'iulphiteg 
 
 lets than 0S% as KjSsOsI 
 
 
 1 hjiphitea 
 
 less than 004% ai 
 
 3 PjOtl 
 
 
 Muiiiinui.i 
 
 k 3 than 0.04% 1 
 kas tluiii 0.001%/ 
 
 POTASSIUM 
 
 C arbonate 
 
 
 Kahlbaum "C.f.A/' 
 
 
 Carbonate 
 
 
 Kahlbaum "C.f.A." 
 
 
 r ontent K2CO3 
 
 9/ 15% 
 
 
 
 H,0 
 
 2 88%. ^ 
 100 03% 1 , 
 
 1 
 
 
 C hlonda 
 
 
 
 
 
 none/ J 
 
 
 
 
 
 
 
 
 
 ^Certified 
 
 
 Nitrate 
 
 
 /Analysis 
 
 
 
 
 
 
 
 noneV t 
 
 
 
 
 none\ 1 
 
 i 
 
 
 Sulphite Sulphide and | 
 
 } 
 
 
 Thiosulphate 
 
 
 
 
 
 
 
 POTASSIUM 
 
 
 p , anhydrous 
 0003% , 
 
 Baker Analyzed 
 
 
 Fe 
 
 
 
 
 0001% 
 
 
 
 SiOi 
 CaO 
 
 005% ' 
 001%/ 
 
 > Typical 
 Analysis 
 
 
 SO] 
 
 020%; 
 
 
 
 
 p , anhydrous 
 0001% 
 
 
 
 &<), 
 
 
 POTASSIUM 
 
 Carbonate. 
 
 solution, about 
 
 
 33% Merck Blue Label 
 
 Tested for the same Bubatances as 1 
 Potassium Carbonate (using 3 cc. I Guaranteed 
 solution instead of 1 gram Fotas- ( Analysis 
 slum Carbonate) ' 
 
 "POTASSIUM Chlorate, crystals 
 
 " " Chlorate, powder 
 
 " " Chlorate, c. p., small crystals Baker Analyzed 
 
 " " Chlorate c p large crystals Baker Analyzed 
 
 ° " Chlorate c p powder Baker Analyzed 
 
 To 0002^" 1 
 
 Ca J no e ( Typical 
 
 lund jiricei Price in oilier !,iio [lackac'i 
 
 .25 cb .08 H lb. .15 incl 
 
 incl H lb. .30 incl 
 
 100 Rim. .60 incl 
 
 500 grm. 1.30 incl 
 
 .40 cb .08 H lb. .IS incl 
 
 .GO cb .08 H lb. .22 incl 
 .65 incl U lb. .25 incl 
 
 .15 cc .04 
 
 .15 ec .04 
 
 .35 cb .08 U lb. .20 incl 
 
 .40 cb .08 14 lb. .20 incl 
 
 .40 cb .OS K lb. .20 incl 
 
 "POTASSIUM Chlorate 
 
 Ch or des less tbi 
 Hea y metals 
 Calc um 
 Bromates le 
 Nitrates ies 
 Sulphate'' 
 
 "POTASSIUM Chlorate 
 Chlorate 
 
 A s 
 
 Ntrate 
 Chlor de 
 Hea y n etah 
 \ kal p Parthfl 
 
 POTASSIUM Chloride pure 
 '■ Chloride c p 
 
 Merck Blue Label 
 
 Kahlbaum "C.f.A.' 
 Kahlbaum "C.f.A.' 
 
 El „, L,.,» 
 
 .50 incl H lb. .20 incl 
 
 500 grm. .85 incl 
 1000 grm. 1.35 incl 
 
 .18 cc .04 
 
 .25 cb .08 M lb. .15 incl 
 
 Mg 
 [ Chloride 
 
 Hea V me a 3 
 Alkal ne 
 
 ea ths less tl a 
 
 S Iphates less tba OUl 
 N tritea lass than 003' . 
 Chlorates less than 018% t 
 MaKnci m less tl a 
 
 Merck Blue Label 
 
 .00 inci i4 lb. .25 incl 
 
ARTHUR H 1' H O M A .'^ 
 
 C 
 
 M 
 
 PAN 
 
 Y 
 
 Ount 
 
 e and pojnd prIcBS 
 
 
 Price in oihe 
 
 rsi;epack 
 per 0kg, 
 
 •egee 
 
 Maker sr Brand per 0?. 
 
 co;it, per lb. 
 
 wnt 
 
 com. 
 
 POTASSIUM Chloride Kahlbamn "C.f.A." 
 
 
 
 500 (irm. 
 
 .90 
 
 incl 
 
 Heavy melals noaei \ 
 
 
 
 
 
 
 Alkaliue earths none! in 10 ( Cerlifietl 
 
 
 
 
 
 
 Kulphate nonef grams/ Analysis 
 
 
 
 
 
 
 Content 100.00%' ; 
 
 
 
 
 
 
 POTASSIUM Chloride, c.p. (Sodium free).. Baker Special 
 
 . , . .50 cb 
 
 .08 
 .04 
 .07 
 .07 
 
 Klb. 
 
 .20 
 
 incl 
 
 " Chromate, yellow 
 
 " Chromate, neutral, pure. 
 
 ... .30 cc 
 .35 cb 
 
 
 "Klb. 
 
 !20 
 
 
 POTASSIUM Chromate, c, p a " Baker Ana! v zed 
 
 ... .50 cb 
 
 incl 
 
 I.V,() * uone-i 
 
 
 
 CI -0.001%( Typical 
 
 
 SOj —0 002% ( Analysis 
 
 
 
 
 
 
 Fe 0.0002%^ 
 
 
 
 
 
 
 POTASSIUM Chromate Merck Blue Label 
 
 . 1.00 
 
 inci 
 
 !.i lb. 
 
 .35 
 
 incl 
 
 
 
 
 Sulphates . . .less than 0,029% as SOi 1 
 
 
 
 
 
 
 Chlorides. . . .less than 0.0025% as CI \ Guaranleed 
 
 
 
 
 
 
 Alumina leas than 1% as Al / Analysis 
 Alkalmc I 
 
 
 
 
 
 
 earths le'is than OOS^o m Co.) 
 
 
 
 
 
 
 POTASSIUM Chromate . . . Kahlbaum "C.f.A." 
 
 
 
 100 grm. 
 
 .75 
 
 incl 
 
 " Chromate . . . Kahlbiium "C.f.A." 
 
 
 
 500 grni. 
 
 1.95 
 
 incl 
 
 Free alkali cono 1 
 
 
 
 
 
 
 Sulphate none/ 1 
 
 
 
 
 
 
 Chloride none! in 10 1 ^ ,-« . 
 
 
 
 
 
 
 Alkahne earths none Wins". Certified 
 
 
 
 
 
 
 Alumina none/ i ^""^^^'^ 
 Content ^8 3b%l 1 
 Moisture 109%' 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 POTASSIUM Citrate, gi inular 
 
 65 cc 
 
 .04 
 
 
 
 
 " Citrate, c p . Baker Analyzed 
 
 1.00 cb 
 
 .0.S 
 
 "'ii\b. 
 
 ^3.5 
 
 
 Fe... -0 00I%1 
 
 Pb... none! Typical 
 
 
 
 
 
 
 
 
 
 
 SOj.. 0002%(-' Analysis 
 CO;.. 080%; 
 
 
 
 
 
 
 
 
 
 
 
 POTASSIUM Cyanate, c p 60 
 
 incl 6.00 cb 
 
 .OS 
 
 M lb. 
 
 1.85 
 
 incl 
 
 " Cyanide Mixture, fused, 
 
 
 
 
 
 
 technical (98-99%) 
 
 40 
 
 incl 
 
 10 1b. 
 
 3..50 
 
 incl 
 
 " Cyanide Mixture, powder 
 
 
 
 
 
 
 (98-99%) 
 
 55 cb 
 
 .08 
 
 
 
 
 
 
 
 
 
 
 100'", ) ... Baker Analyzed 
 
 45 cb 
 
 .08 
 
 Vi lb. 
 
 .20 
 
 incl 
 
 " Cyanide Mixture, powder 
 
 
 
 
 
 
 (QS-lOO',-) ... Baker Analyzed .. . 
 
 60 cb 
 
 .08 
 
 Mlb. 
 
 .20 
 
 incl 
 
 C M 5'),6%-L 
 
 Tp 003%( Typical 
 
 
 
 
 
 \l Os 001% /■ Analysis 
 
 
 
 
 
 
 N B. present ' 
 
 
 
 
 
 
 POTASSIUM C\anide ... Merck Blue Label .35 
 
 incl 
 
 
 M lb. 
 
 1.00 
 
 incl 
 
 bulphidea les'i than 0.003% as S , 
 
 
 
 
 
 
 Carbonates less than 4% CO: i 
 
 
 
 
 
 
 Siilphoc\anates les^i thin 0.015% as SCN \ Guaranleed 
 
 
 
 
 
 
 FerrocvanidL" le^s than 005%, as FefCNle/ Analysis 
 
 
 
 
 
 
 Sulphates les'^ than 0.0875% aa S0,\ 
 
 
 
 
 
 
 f hlond. 3 less than 0.004% as CI,' 
 
 
 
 
 
 
 POTASSIUM Cjanide . . . Kahlbaum "C.f.A." 
 
 
 
 50 grm. 
 
 .90 
 
 incl 
 
 " Cyanide ... Kahlbaum "C.f.A." 
 
 
 
 100 grm. 
 
 1.45 
 
 incl 
 
 Sulphate none\ i 
 Ferrocvamdeaod 1 1 
 Sulphooianide nona\ m 10 V Cerlilied 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Sulphide none/ grams/' Analysis 
 Carbonate none I \ 
 Content 91 74% ' ) 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 POTASSIUM Dichromafe (See Bichromate) 
 
 
 
 
 
 
 •' Fernet anide, coml cri st 
 
 45 cc 
 
 .04 
 
 
 
 
 " Ferricj anide, pure 
 
 POT A '\'«;TIIIVI ITfirricvniiirlp c ii Bakftr Analvzed 
 
 65 cb 
 
 .08 
 
 
 
 
 . . . . 1.00 cb 
 
 .08 
 
 ■ ■ l-i lb. 
 
 !35 
 
 incl 
 
 
 
 
 
 
 POTASSIUM Pernc^anide Merck Blue Label 
 
 . . . 1.60 
 
 incl 
 
 ;» lb. 
 
 .50 
 
 incl 
 
 Ferrous 1 
 
 
 
 
 
 s-llt" not more than 058% Fe { Guaranteed 
 
 
 
 
 
 
 Sulphates... leas than 0.005% as SOjf Analysis 
 Ohlorirlp^ lesa than 0-01%, as CI/ 
 
 
 
 
 
 
 
 
 
 
 
 POTASSIUM Ferricyanide Kahlbaum "C.f.A." 
 
 
 
 100 grm. 
 
 .95 
 
 incl 
 
 Fcrrou'^'salli" ^i'iii^nonef in 10 ( Certified 
 
 
 
 
 
 
 Chloride faint trace (■grams/ Analysis 
 
 Content 99.S9%,' ; 
 
 
 2S cc 
 
 .04 
 
 
 
 
 POTASSIUM Ferrocyanide, yellow, cryst 
 
 
 " Ferrocyanide, pure, powder. 
 
 
 
 
 
 
 anhydrous 
 
 60 cb 
 
 .08 
 
 Mlb. 
 
 .22 
 
 incl 
 
 orAT' * COIITTVT ITAFFni-uanii^a i- r> H/ikcr AiialvKpd 
 
 60 cb 
 
 .08 
 
 Mlb. 
 
 .22 
 
 
 rxj I Aboi LI JVI r errocyaniae, c. p jjaiici - miiij'iCLi 
 
 
 
 |.;;;:;:::;::;;:::::::::::S:S[I™S, 
 
 
 
 
 
 
 
 
POTASSIUM Ferrocyanide Merck Blue Label 80 incl H lb. .30 incl 
 
 Carbonates. ..leas than 0.75%a3 CUi) ^ „ , j 
 Sulphates. . .less than 0.0075% as SOjf ^^^Y " 
 Cl,loridea loss than 0.01% as C\) *"»")'S'3 
 
 POTASSIUM Ferrocyanide Kahlbaum "C.f.A." 100 grm. .65 incl 
 
 " Ferrocyanide Kahlbaum "C.f.A." 500 grm. 1.50 incl 
 
 Sulphato. , 
 Chkiri.' 
 
 d to /grams/ f 
 
 !r of 1 \ 
 
 100,4.1%,' ' 
 
 ).004% u^ Si ij 
 0,0025% a^ CI \ 
 M6% as N;Oi I 
 
 Q0.00n27o n/ 
 nnnrrw M.n,' 
 
 .hloride 
 
 Carbonate 
 
 Content, calculated I* 
 3 molecules water o 
 
 • crystallization 
 
 POTASSIUM Fluoride, c.p Baker Analyzed 1.25 cb .09 ]4\h. 
 
 Formate, c. p Baker Analyzed 2.00 cb .08 l-i lb. .t>3 
 
 " Hydroxide, coml., powder 
 
 (Caustic Potash) .15 incl 10 lb. 1.00 
 
 " Hydroxide, electrolytic, sticks .35 cb .08 3'4 lb. .18 
 
 POTASSIUM Hydroxide, purified Merck Blue Label .45 incl M lb. .20 
 
 Nitrates. . .less than 0.0016% as NtOsj 
 
 Aluminum less than 0,1% 1 
 
 Calcium less than 0.1%' Guaranteed 
 
 Heavy metals at moat a trace/ Analysis 
 
 Potassium I 
 
 Carbonate not more than 5%' 
 
 POTASSIUM Hydroxide, purest Merck Blue Label .20 incl 
 
 Sulphate less than 0.004% : 
 
 Chlorides less than 0.0025%, 
 
 Nitrates less than O.Of " " " 
 
 Nitrogea aa nitrates; nitrites 
 
 and Ammonia less than . 
 
 Nitrites less than 0,00011% NsOa' 
 
 Phosphates leas than 0.004% as PjOs 
 
 Silicates not more than 0.03% SiO=- 
 
 Alumiaa not over 0.0106% as Al 
 
 Calcium less than 0,012% V 
 
 Heavy metals nc 
 
 Substances insoluble in Alcohol nc 
 
 Potassium 
 
 POTASSIUM Hydroxide,c'.'p-Jbyalcohol..... '" 60 cb .OS 34 lb. 
 
 POTASSIUM Hydroxide, purified by alcohol Merck Blue Label 70 incl J4 lb. 
 
 Sulphates less than 0.004% as SOj'-, 
 
 Nitrates less than 0.001G% aa NsOs j 
 
 Nitrogen, as nitrates, nitrites, f 
 
 and Ammonia, etc less than 0.00113% N 
 
 Chlorides less than 0.005%, as CI V Guaranteed 
 
 Silicates not more than 0.06%, 
 
 Alumina 
 
 Calcium 
 
 Heavy metals 
 
 Potassium Carbonate. 
 
 POTASSIUM Hydroxide, solution, all 
 
 strengths Aicn-k Blue Label .50 iucl 
 
 Tested for the same substances us 
 under Potassium Hydroxide 
 Pure, but using 2 oc. of solution 
 sp. er. 1.3, or 5 cc. of solution 
 sp. gr. 1.138 instead of 1 gram 
 Potassium Hvdroitide pure 
 
 POTASSIUM Hvdroxide pure (by Bai\ta) 2.50 incl 
 
 " lodate, c p 55 incl 
 
 " lodate Merck Blue Label .65 incl 3i oz. .25 
 
 Freearida less than 07% as HIO, 1 p.„._„tp-a 
 
 I.dide. Ie33than00015%li rnaka^s 
 
 Chlorates leas than 15% as CbOs^ Analysis 
 
 POTASSIUM Iodide, crystals 3.75 cb .08 
 
 " Iodide, c p Bakei Analyzed .40 incl 4.00 cb .06 K lb- 1-25 
 
 loiate trace J 
 
 CI -0 ooT%' i^ri 
 
 bO. 001%L Analjsis 
 
 CO trace 1 
 
 POTASSIUM Iodide Merck Blue Label .40 incl 5.00 incl i^ lb. 1.35 
 
 Potassium Cnrboaate less than OOP"' 
 
 S03\ 
 
 .0. 
 'o Nf 
 
 an 0.06%, as H'lOi / Analysi 
 nore than <\?,2",_ i 
 ..less than 0.04'; I 
 
 ■more"lhan^4 IS' ', ' 
 
 Sulphates less than 01% . 
 
 Cyanides leas than 0J% CN \ 
 
 lodatea less than 001% as ' " 
 
 Ferric salts leas than 005% 
 
 i 1 Os/ ? 
 Fe i 
 NiOcl 
 
 o„%; 
 
 " Blue 
 
 1... 
 I' 
 
 Nitrates les^- than 0016% 
 
 E\ceis of PotT^aium Chloridi, at most 
 
 POTASSIUM Iodide mutn! Merck Blue Label .45 incl 5.50 incl li\h. 1.50 
 
 N^utriliU II 'i th^nOIIO ilUh ts KOH \ 
 
 I nti ■iinin f ,rli (i it ksi than 0," " 
 
 H^aw metih n' 
 
 Sulphates I i i 
 
 C\anides ' 
 
 lodatea 1 I 
 
 Feme salta I ' I 
 
 Nitrato" h tl i i 
 
 Lxce*! of Potassium Chi n I ■\\ \n it 
 
Maker or Brand per oi. cent. per lb, cont. siza pky. per pkg. conl. 
 
 POTASSIUM Iodide, c. p Baker .Special .50 incl 5.00 cb .06 M lb. 1.55 incl 
 
 " Molybdate, c. p 45 incl 
 
 ° " Nitrate, granular 20 cc .04 
 
 " Nitrate, pure, crystals .20 cc .04 _ . . ■ 
 
 "POTASSIUM Nitrate c, p., crystals Baker Analyzed 30 cb .08 }i\h. .18 inc 
 
 " " Nitrate c. p., powdered Baker Analyzed 35 cb .OS }4 lb. .18 incl 
 
 Cl —0 001%! 
 
 SOi 
 
 CaO 
 
 [ Typical 
 Analysi.s 
 
 Pcrchlorate trace ' 
 
 'POTASSIUM Nitrate Merck Blue Label 80 inc! li lb. .-^0 
 
 Sulphates l«33 thau 0,0025% as aOj I 
 
 Chlorides less than 0.0005% as Cl i 
 
 Chlorates and Peruhloratcs less thaT 0,0005% as ChOtl Guaranteed 
 
 Calcium less than 0.01% ) ^„„ j^ 
 
 Heavj' metals none / 
 
 Iron less than 0.0008% I 
 
 Nitrites less than 0.00055% as NiOa ' 
 
 "POTASSIUM Nitrate Kahlbaum "C.f.A." 100 ^nn. .60 
 
 Nitrate Kahlbaum "C.f.A." 500 grm. 1.-50 
 
 Alkaline earths none . i 
 
 Heavy metals none I f 
 
 Sulphate noneV, In 10 " Certified 
 
 Chloride none/ grams / Analysis 
 
 Chlorate nonel \ 
 
 Nitrite.... none' ' 
 
 "POTASSIUM Nitrate, c. p., fused .55 (.^ I. .08 HWy. .20 
 
 POTASSIUM Nitrite, c. p., crystals Baker Analyzed .15 incl .80 cb .08 '.i lb. .40 
 
 " Nitrite, c p , sticks . . . Baker Analyzed .l-i incl 1.15 cb .08 H lb. .40 
 
 KNO 80% N 
 
 ri 010% J 
 
 SUa 001% V Typical 
 
 CiO 001%/ Analysis 
 
 Fe 0001% i 
 
 I none ' 
 POTASSIUM Nitrite, sticks . . . Merck Blue Label 1.50 iucl '4 ib. .50 
 
 Heii \ mttdlb . . . . none J (-unmnfooil 
 
 ( h) .r, 1 s less than 002% as Cl \ Anal "^ 
 
 Silphitp 1l" than 175% as S0,\ A"^"'^'*' 
 POTASSIUM Oxalate, neutral, crystals 25 cc ,04 ■■■■;--■ ■-■■ 
 
 Oxalate, c p Baker Analyzed 4» cb .07 h 'b. .20 
 
 Fe —0 0004%! 
 
 CaO 001%^ Typical 
 
 C\ 0005% I ^""'''^'^ 
 
 SO3 Done ' 
 
 POTASSIUM Oxalate neutral Merck Blue Label 1.25 incl }i lb. .40 
 
 Neutr^htA Las than 0045% and da HiCiO* 1 
 
 Sulnhite-i less than 005% as SOsl Guaranteed 
 
 Chi jride-. leas than 0025% as C! ( Analysis 
 
 Hej^\ metjK none' 
 
 POTASSIUM Oxalate, neutral Kahlbaum "C.f.A." 100 grm. -80 
 
 Oxalate, neutral Kahlbanm "C.f.A." -^00 grm. J.2o 
 
 Chbride faint trace I I 
 
 Iron faint trace f j„ ^q (Certified 
 
 Hwi^y metals none, ,g Analysis 
 
 Sulphate none I V 
 
 font i.t 100 00<^ ' ' 
 
 ^POTASSIUM Perchlorate .... .1-5 incl 1.40 cb .07 , .'4 lb. .45 
 
 " Perchlorate Merck Blue Label .30 mcl 
 
 Calcium lesa than 0.02% ) 
 
 Chlorides less than 0.002% as C!( Guaranteed 
 
 Heavy metals ,■ ■ ■ ■ ■ ■ i;;;.;^ ■ ■ ■ '^^^f Analysis 
 
 Nitrates less than 0.0016% as NjOtt 
 
 Sulphates less than 0.005% as SOa ' 
 
 ' POTASSIUM PeTmanganate, pure, crystals 25 cc .04 
 
 Permanganate, c. p., small • t ~c u n^ t ik w 
 
 crvstals ■ ■-■ Baker Analyzed .10 inrl ..35 cb .0/ k lb, .20 
 
 01 O.0002%-i 
 
 SO! 0.002% ( Typical 
 
 fAn none ( Analysis 
 
 Fe ::::::.... 0.0002%; 
 
 "POTASSIUM Permanganate ^^^^'^^ ^'^^ ^'^^"^ '^^ '"''^ '^ ""' "^ 
 
 Sulohates less than 0.03% as bOsi 
 
 Clilorides less than 0.004% as Cit Guaranteed 
 
 Nitrates less than 0.08% aa N^Osf Analysis 
 
 Chlorates less than 0.0016% as ChOs.' 
 
 •POTASSIUM f "-anganate, free from ^^^^^^ ^^^^ ^^^^^^ ^ ^^ .^^^ , , ,j_ ^^ 
 
 SSi, ■..;,. -1..S than 008%.. N.O.f- A™1,.» 
 
 CIJoKit.. le»» tban 0.0016% a> ChOj ,„,,„ ,„„ o„ 
 
 •POTASSIUM Permanganate Kahlbaum "C.f.A." 100 grm. .80 
 
 45 
 
■oz. cont, per lb. 
 
 n oilier size packages 
 
 POTASSIUM Permanganate 
 
 ( hlon.ip 
 
 Chlorate 
 
 Nitrate 
 
 Content 1( 
 
 Moist urp rema 
 
 ^POTASSIUM Permanganate, ■ 
 
 msf lib 
 " Persulphate, c i 
 
 Pb 
 f 1 
 
 NH3 
 Ma 
 
 Persulphate 
 
 rhbnd«-< 
 Hiiw iiietala 
 
 Pho!>phate, c 
 
 {KH2PO4) 
 
 Fe 
 Na 
 
 Kahlbaum "G.f.A." 500 gvni- 1.95 incl 
 
 large 
 
 — u 001% I 
 —0 001%;- 
 
 Baker Special 
 Baker Analyzed 
 
 .10 incl .75 cb .07 M lb. .25 incl 
 2.00 cb .08 i-ilb. .65 incl 
 
 POTASSIUM 
 
 POTASSIUM 
 
 ... Merck Blue Label 
 
 less than 002% aa CI 1 Guaranteed 
 none or at most a trace j Analysis 
 
 ' , monobasiu 
 
 . . Baker Analyzed 
 001% I 
 
 I Typical 
 
 ^ Analysis 
 
 POTASSIUM Phosphate, 
 
 fkHPOi) 
 
 Fe 
 CaO 
 
 POTASSIUM Phosphate, 
 
 fKsPO.) 
 
 002% 
 
 005%.! 
 
 dibasic 
 
 Baker Analyzed 
 
 003% 1 
 0002%! 
 
 001%' : 
 
 002% / 1 
 0002% \ 
 002%' 
 
 tiibasic, 
 
 n 
 
 fcOa 
 
 Baker Analyzed 
 [ Typical 
 
 1.25 incl li lb. .40 inc! 
 
 .75 cb .07 h' lb. .25 incl 
 
 .75 cb .08 h lb. .25 incl 
 
 .90 cb .OS }i lb. .35 incl 
 
 001% i Analysis 
 001%,' 
 
 Merck Blue Label 
 
 
 POTASSIUM Pyroantimonate (acid) 
 
 T, tc I for "uitahihtj t 
 for Sodium. 
 
 POTASSIUM Pyrophosphate, c. p 
 
 " Silicate, coml., lump 
 
 '" Silicofluoride, c, p 
 
 POTASSIUM Stannosuiphate, tested re- 
 agent Merck Blue Label 
 
 Sulphate, pure, crystals 
 
 " Sulphate, pure, powder 
 
 POTASSI UM Sulphate, c. p., crystals Baker Analyzed 
 
 " Sulphate, c. p., powder Baker Analyzed 
 
 r<- o.ooi%j 
 
 20 cc 
 
 .20 incl 2.00 cb 
 
 CaO 0,001% 
 
 MgO,. 
 
 CI 0,003% 
 
 N 0.006% 
 
 Typical 
 Analysis 
 
 POTASSUIiM Sulphate 
 
 Chlorides leaa than 0.001% 
 
 Heavy metala (Cu, F'e) 
 
 Calcium ieaa than 
 
 Magnesium less than 0.005% 
 
 Merck Biuc Label 
 
 .15 cc 
 .18 cc 
 .30 cb 
 .35 cb 
 
 Ij lb. l.IO incl 
 
 ii lb. .40 incl 
 
 li lb. .65 incl 
 
 ,07 a lb. .17 incl 
 
 07 M lb. .17 incl 
 
 Ira 
 
 0.02% f , 
 
 ;S3 luaa 0.005% ) j 
 
 13 than 0.0008% / " 
 
 .0032% aa NjOlI 
 
 0.005% as NHs } 
 
 .45 incl M lb- .20 incl 
 
 POTASSIUM Sulphate Kahlbaum ' 
 
 " Sulphate Kahlbaum 
 
 Heavy metals none'l 
 
 Alkaline oartlia none! In 10 
 
 Chloride slight trace/' grama 
 
 Sodium none ' 
 
 POTASSIUM Sulphate, c. p Baker Special , 
 
 Fe — 0.001%' 
 
 C'iill —0,001% 
 
 .Mt'O 0.001% 
 
 —0.001% 
 
 ■C.f.A.' 
 'C.f.A.' 
 
 N.- 
 
 POTASSIUM Sulphide, pure, lumps, (Liver 
 
 of Sulphur) 
 
 Sulphide Merck Blue Label 
 
 NitroKRn not more tlian 0.0112% 
 
 POTASSIUM Sulphifle Solution, 5% Merck Blue Label 
 
 Nitroeon not more than 0.00056% 
 
 'POTASSIUM Sulphide, c. p., crystals Bakei Analyzed 
 
 Fe 0,001%-! 
 
 AliOj —0,001%^ Typical 
 
 0.030%, (" Analysis 
 
 1000 grm. 1.20 incl 
 
 .50 cb .07 }i lb. .20 incl 
 
 .20 cb .08 
 
 .80 incl y.i lb. .30 incl 
 
 .50 incl 
 
 .10 incl .60 gb .15 ?-4 lb. 
 
 SO] present ' 
 
 40 
 
^POTASSIUM Sulphide, c. p., crystals... 
 
 !■« 0,0003%, 
 
 A'^Oa — 0.0017o' Typical 
 
 Baker Special 
 
 SOj . 
 
 Baker Analyzed 
 
 POTASSIUM Sulphite, c!'p. ! .■. .7. ...... 
 
 Sulphocyanate (Thiocyanate) 
 
 pure, crystals 
 
 POTASSIUM Sulphocyanate, c. p Baker Analyzed .10 
 
 SOa 0,00!%i 
 
 ^e 0.0001%( Typical 
 
 NH, trace / Analysis 
 
 CI 020%' 
 
 POTASSIUM Sulphocyanate ' Merck Blue Label .25 
 
 Substances insoluble in Alcohol none, 
 
 Chlorides leaa than 0.0025% as CI J 
 
 Siilphatw less than 0.01% as SOj" Guaranteed 
 
 ITo;u'y iiiotala none/ Analysis 
 
 Iron less than 0.0004%.l 
 
 \r.iijujr,iuni eoznpounds less than 0:0011% aa NH,/ 
 
 POTASSIUM Sulphocyanate Kahlbaum "C.f .A.'' . . . 
 
 " Sulphocyanate Kahlbaum "C.f.A." . . . 
 
 Heavy metals none ) t 
 
 Sulphate not present f i„ ,n I f„,iifi„j 
 
 Chloride notpresent^ J"^" )■ ^Zlti^ 
 
 Iron undeterminable trace L ^^^''"' [ Analysis 
 
 Rolubilitvin Alcohol., .complete! ' 
 
 "POTASSIUM Sulphydrate Merck Blue Label .25 
 
 (Potassium Hvdrosulphide) 
 
 Polvsulphides , , . ." none 
 
 •POTASSIUM Tartrate, granular 
 
 Tartrate, c. p., crystals Baker Analyzed 
 
 Tetroxalate, c. p Baker Analyzed 
 
 Fe 0.0002%1 
 
 SOs —0.001%! Typical 
 
 CaO 0.007%C Analysis 
 
 CI.. nnn^t 
 
 .GO cb .08 
 
 .50 iiici 
 . 1.00 cb .09 
 
 lOOgi-m. 1.1.5 
 500 grm. 3.75 
 
 10 
 
 .55 cb .09 
 .80 cb .08 
 1.10 cb .08 
 
 POTASSIUM Tetroxalate Merck Blue Label 
 
 CWorides _.le^,thanOJ025%asCn n„aran,ecd 
 
 
 Baker Analyzed 
 
 Sulphates ,„ 
 
 Heavy metals 
 
 POTASSIUM Thiocyanate (See Potasaii 
 " Hulphocyanate) 
 
 " Thiosulphate, o. p 
 
 POTASSIUM Zinc Sulphate, c. p 
 
 PUMICE Stone, lumps 
 
 " Stone, powder 
 
 PYRIDINE, technical 
 
 " medicinal 
 
 PYRIDINE, c. p Baker Analyzed 
 
 Sp.gr 0.97 i Typical 
 
 B. P lla°-118°C! Analysis 
 
 PYROGALLOL (See Acid Pyrogallic) 
 
 QUERCIT 
 
 RADIUM. Information concerning Ra- 
 dium and Radium Salts on 
 application 
 
 RAFFINOSE (Meletose) 
 
 REALGAR, red (See Arsenic Sulphide) 
 
 ROSIN, white 
 
 " yellow 
 
 RESORCIN, white, crystals 
 
 RESORCIN Merck Blue Label 
 
 NoiiTOlalile mailer. . . . .l.i. llian 0.0S%1 G„„anleed 
 d Phenol...... no.ie^ Analysis 
 
 1 2.00 cb .OS 
 
 .30 cb .08 
 
 .10 cc .04 
 
 .10 cc .04 
 
 .75 incl 
 
 3.00 gb .14 
 
 I 3.00 cb .OS 
 
 U lb. .30 
 T4 lb. .35 
 
 M lb. .50 
 
 a lb. .65 
 M lb. .30 
 
 .12 cc .04 
 
 .10 cc .04 
 
 : 1.15 cb .OS 
 
 .20 
 
 acida 'Lvg. Salicylic Acid) no 
 
 RHAMNOSE (Isodulcite) 
 
 ROCHELLE Salts (See f^odium and Po- 
 tassium Tartrate.) 
 
 ROUGE, for polishing, Ferric Oxide 
 
 RUBIDIUM Chloride 
 
 SACCHARIN, c. p 
 
 SACCHAROSE, c. p. (Cane Sugar) 
 
 SACCHAROSE 
 
 SAL AMMONIAC (See Ammonium Chlo- 
 ride) 
 
 SALICIN 
 
 SAL SODA (See Sodium Carbonate) 
 
 SAND, Quartz Merck Blue Label .... 
 
 Substances soluble in Hydrochloric Acid., .not more than 0.03%) Guaranteed 
 Chlorides. less ,tl'a.n_'''?02%^a9 Q J Analysis 
 
 Kahlbaum 
 
 I 2.00 cb .08 
 1.00 cb .08 
 1.60 incl 
 
 i lb. 1.00 
 
 1 grm. .50 
 
 10 grm. .90 
 
 U oz. .25 
 
 10 gnu. 1.80 
 
 10 grm. 1.50 
 U lb. .70 
 ?i lb. .35 
 
 10 grm. .40 
 1-4 lb. .3.5 
 
 Volatile substances. . 
 
 ethan 0.02%) 
 47 
 
ARTHUR 
 
 H , T H M 
 
 A S 
 
 
 COM 
 
 P 
 
 A N 
 
 Y 
 
 
 Maker or Brand 
 
 Ou 
 
 
 pound pricf 
 
 incl . 
 
 incl 
 
 incl 
 
 incl 
 
 .04 . 
 
 .04 . 
 incl . 
 incl . 
 
 Vice in oth 
 ize pkg. 
 
 125 lb. 
 1 grin. 
 
 book 
 
 H oz'. 
 >ioz. 
 
 ij lb. 
 
 p=r pkg. 
 
 lagss 
 
 SAND. Sea 
 
 tsf Oi. 
 
 t..l. 
 
 per lb. 
 .10 
 .20 
 .40 
 
 .10 
 
 .45 cc 
 .50 cc 
 .10 
 .40 
 
 c.nl. 
 
 " washed and ignited. . 
 
 
 
 
 
 
 " " washed and ignited Merck Blue Label 
 
 Substances soluble in Hydrochloric Acid. -. .not more than 0.3% ) 
 Chlorides less than 0.002% as CU 
 
 .20 
 5..50 
 
 incl 
 
 
 
 
 SAND, standard for briquettes, . 
 SHELLAC, Orange, flakes 
 
 
 incl 
 
 " bleached 
 
 
 
 
 
 
 SILICA, powdered (Silicic Acid), 
 
 
 
 
 
 
 " precipitated, technical.. 
 
 (.'.'.'.'.'.'.'.'. '.'.'.'.'.'.'.'.'.[[.'...[/. 
 
 
 
 
 
 SILICON, metal, c. p., crystals. , 
 
 SILVER, metal, pure, granulated 
 
 metal, foil 
 
 1.40 
 1.20 
 
 incl 
 inol 
 
 .25 
 
 incl 
 
 SILVER, metal, sheets 
 
 Merck Blue Label 
 
 than 0.025% 
 
 1.00 
 
 .15 
 
 iaei 
 
 Foreign metals less i 
 
 SILVER, leaf, pure, in books.... 
 
 
 
 
 
 
 " Arsenite, c, p 
 
 1.50 
 
 inc! 
 
 
 
 
 SILVER Asbestos 
 
 Merck Blue Label 
 
 Merck Blue Label 
 
 
 
 1.50 
 ..50 
 
 inci 
 
 " Asbestos 
 
 
 
 
 
 
 Chloride 
 
 .7.5 
 1.00 
 1.00 
 
 .60 
 
 .65 
 
 .90 
 
 .50 cb 
 1.00 
 
 1.35 
 
 incl 
 incl 
 incl 
 incl 
 incl 
 
 iiirl 
 
 .04 
 incl 
 
 incl 
 incl 
 
 incl 
 
 
 
 
 Chloride, c. p 
 
 
 
 
 " Cyanide, c. p 
 
 3.50 
 
 
 Nitrate, c. p., crystals. 
 
 8.75 cb 
 1.3.50 
 
 .07 .. 
 
 incl 
 
 
 "SILVER Nitrate, c. p., crystals, 
 
 Fc 
 
 CaO 
 
 Na 
 
 Ci 
 
 SO3 
 
 'SILVER Nitrate, crystals 
 
 Chlorides 
 
 Baker Analyzed 
 
 . 0,0005-%) 
 
 ,".... °°°.° Merck Blue Label 
 
 leaa than 0.002% 1 
 
 incl 
 
 Salts of CopiRT 
 S.ill'.of P.iatnull, 
 S;,ll«-K- l..;,.| 
 
 Ilydrwlil.jnc .\oi.l .',,,,,' 
 
 less than 0,3% Pb/ Analysis 
 .'.^leas than 0,025%' 
 
 Merck Blue Label 
 
 ess than 0.002% as CI J 
 
 
 "SILVER Nitrate, sticks 
 
 
 
 
 Chlorides 1 
 
 
 
 .40 ' ' 
 
 
 Salts of Copper 
 
 Salts of Bismuth 
 
 .'less than 0.002% Cu \ r.,aran(,.pH 
 
 , . .less than 0.02% Bi . i'^^.^fi*'*^'' 
 less than 3% Vh( A""'^'*"* 
 
 
 Impurities not precipitated by 
 Hydrochloric Acid 
 
 SILVER Nitrite, c p 
 
 less than 0.02.5% J 
 
 
 SILVER Nitrite 
 
 
 2.50 
 1.10 
 
 
 
 
 Substances not precipitated 
 
 by 
 
 
 
 
 SILVER Sulphate, c. p 
 
 
 
 
 .25 
 
 incl 
 
 
 
 Palm Oil 
 
 
 
 .10 
 
 
 SODA ASH (See Sodium Carbonate) 
 SODA LIME (See Sodium Calcium Hy- 
 droxide) 
 
 ♦SODIUM, metal, sticks 2.5 iiud .90 incl 
 
 • " metal Merck Blue Label .30 incl J^ lb. .60 incl 
 
 Nitrogen conn pounds loss than 0,07% N I Guaranteed 
 
 Foreign metals. none | Analysis 
 
 SODIUM Acetate, crystals 15 cb .09 
 
 " Acetate, crystals, pure, fused 20 cb .08 
 
 " Acetate, c p , crystals ,. Baker Analyzed 30 cb .08 3^ lb. .15 incl 
 
 1 e 0005%"! 
 1 nonet Typical 
 
 --i'i 005% ( Analysis 
 
 ( I 003%.' 
 
 SODIUM \cetafe, ctvstals .. Merck Blue Label 40 incl H lb. .20 incl 
 
 Ghlori >^ less than 0005 "o as CI 1 
 
 n"/rM ma.I- '''" ^^"^ " "^^^ ^' ^°' ' C„ar.ntB.d 
 
 Ir [1 
 
 SODIUM Acetate M\st iK .. Kahlbaum "C.f,A," 500 grm. .70 iucl 
 
 Acetate (n^t db .. Kahlbaum "C.f. A '' lOOOgrm. I.IO incl 
 
 Other lioi\ 
 
 Chloride 
 ^nlphiit* 
 f irbonatt 
 Soluhiht^ 1 
 
 EC 
 
[ Acetate, e. p., fused Baker An;ilvzod 
 
 ^l 0.003%! 
 
 P^ none! Typical 
 
 ■--1 — 0.0001% f Analysis 
 
 S^Oj _o,O01%.( 
 
 [ Acetate, c. p., anhydrous 
 
 Aluminate, c. p. . . 
 
 Amalgam, 5%, 10%, or 15% '.'.'.'.'.'.'....'.'.'.'.'.'.'. 
 
 Amalgam, 2%, tested reai^eiit , . ^^erck Blii'^ Label 
 ' Ammoniiun Phosphate, (Micro- 
 
 ... Baker Analyzed 
 001%, 
 010% ( Typical 
 
 cosmic Salt) e p 
 
 SODIUM Ammonium Phosphate 
 
 -stlnn J%aaC02 l 
 ill 01)75% a« SO] i 
 1,111 nnoi5%ii3Clt 
 11 OUOlb'iaaNiiOtN 
 
 Merck Blue Label 
 
 Potawmn 
 '. Ammonium Phosphate 
 Ammonium Phosphate 
 
 , Guaranteed 
 / Analysis 
 !i ii than 0005% \ 
 .d thqn 4% as K J 
 
 Kahlbaum 
 
 Kahlbaum 
 
 'C.f.A.' 
 'C.f.A.' 
 
 per II). com, si;e pk(!. puf r'S'S con'- 
 
 .50 rb .OS ^i\y<. .20 incl 
 
 .50 cb .08 M Ih. .20 incl 
 
 1.50 cb .08 3i lb. .50 incl 
 
 .25 incl 
 
 i£ lb- .75 incl 
 
 ..50 cb .08 }i lb. .20 incl 
 
 .90 incl }i lb. .30 ind 
 
 100 gnu. .60 incl 
 500 -irm. 1.30 incl 
 
 IjI 
 
 liinfHii 
 
 = i' 
 
 ir'ienate, ferhnu 
 
 Arsenate, c. p Baker Analyzed 
 
 Arsenate, e. p., anhydrous • 
 
 Arsenite, technical, 90%,. . . . 
 
 I Arsenite, c. p Baker Analyzed 
 
 Asparaginate 
 
 Benzoate, pure 
 
 Bicarbonate, pure, powiler 
 
 I Bicarbonate, c. p., powder Baker Analyzed 
 
 Fe 0.001%. 1 
 
 CaO 0.010%/ 
 
 AiaOa 0.0002%( 
 
 SiOi.. 
 
 001%! 
 
 CI 0,0005%; 
 
 Typical 
 
 Analysis 
 
 ._ — 0,001%,l 
 
 NaiCO^ trace J 
 
 [ Bicarbonate, crystals or powder Merck Blue Label 
 
 Sulphates lesa than 0.0125% a- '"^-^ 
 
 Silicates 
 
 Chlorides less than 0.001% 
 
 Thiosuiphates less than 0.0065% as NazSiOsj 
 
 Phospliates less than 0.033% aa P2O1 
 
 Heavy metals nont 
 
 Iron.. less than 0.0015% 
 
 Potassium less than 0.4% K|' 
 
 Monocarbofiate of Sodium (Neutral 
 
 Sodium Carbonate) o,t most a trace 
 
 Amoioaiuni compounds less tliaii 0032% us NHa 
 
 Sulphooyanates less than__0,l%_SCN 
 
 [ Bicarbonate 
 
 Bicarbonate 
 
 Monorarbona 
 
 Residue on ienitlon.. 
 
 Content lOO.Oi 
 
 Potassium Salts, . . .slight ti 
 
 Kahlbaum 
 Kahlbaum 
 
 'C.f.A." 
 X'.f.A." 
 
 Heavy metals. . 
 Salphocvanate. 
 
 Sulphate . 
 
 Chloride 
 
 Silica .. • npnel 
 
 -■ - milArs 
 
 r)3.13''; \ 
 00.00--; J 
 
 EC 
 
 pnel 
 
 s / A 
 
 TheoHuIphate. . 
 
 [ Bichromate, technical 
 
 Bichromate, c. p., crystals Baker Analyzed 
 
 CaO -0.001%! 
 
 CA ... 0.001'-, I Typical 
 
 Sril .... 0.002% ( Analysis 
 
 Fe 0.008%,' 
 
 : Bichromate Kahlbaum ''C.f.A. | 
 
 Bichromate Kahlbaum O.l-A. 
 
 Content 1)9.47%) 1 
 
 riiW-i.lr .faint tracer j^ ,(, (certified 
 f^y'l''''!''' none grams t Analysis 
 
 ■ Binoxaiate! c. p','.'.."^'' Baker Analyzed 
 
 .20 cb 
 
 OS 
 
 
 
 
 ,50 cb 
 
 » 
 
 Mlb, 
 
 ,20 
 
 incl 
 
 1.00 cb 
 
 m 
 
 Mlb, 
 
 ,:)5 
 
 incl 
 
 .20 cb 
 
 .117 
 
 
 
 
 .70 cb 
 
 ,IK 
 
 Mlb. 
 
 ,24 
 
 incl 
 
 
 
 
 .90 
 
 
 .55 cb 
 
 .OK 
 
 ■1 lb. 
 
 ,20 
 
 incl 
 
 
 114 
 
 
 
 
 ,25 Ob 
 
 .08 
 
 ! i lb. 
 
 .15 
 
 incl 
 
 500 grni. ,75 incl 
 1000 grm. 1,20 incl 
 
 .15 oc .04 
 .4.5 cb .07 
 
 100 gim. ,90 incl 
 500 grm. 2.25 incl 
 
 I4 lb. ,22 incl 
 
SODIUM 
 
 Bismuthate c p 
 
 In 
 
 Raker Analyzed .50 
 
 incl 4.50 cb 
 
 .07 
 
 M lb. 
 
 1.50 
 
 incl 
 
 
 
 Analysis 
 
 
 
 
 
 
 SODIIX 
 
 Bismuthate tpste I reagent 
 Bisulphate c p crystals 
 
 Merck Blue Label .40 
 Baker Analyzed 
 
 incl . 
 
 
 KIb. 
 Klb. 
 
 1.25 
 .15 
 
 
 " 
 
 25 cb 
 
 .08 
 
 incl 
 
 
 000 
 
 
 
 
 
 
 
 
 
 T peal 
 
 
 
 
 
 
 
 -0 on >» 
 
 Vnalysia 
 
 
 
 
 
 
 
 non 
 
 
 
 
 
 
 
 
 d H S 3 4 
 
 
 
 
 
 
 
 SODIIM Bisulphatc 
 
 Merck Blue Label .... 
 
 60 
 
 incl 
 
 i/f lb. 
 
 .25 
 
 incl 
 
 
 H av ncta =! 
 
 o de 6 3 than 00 
 
 Guaranteed 
 
 
 
 
 
 
 
 ■\ sen c e^ t an n no 
 
 Analysis 
 
 
 
 
 
 
 
 P as un ess than 4 I 
 
 
 
 
 
 
 
 SODIUM Bisulphate p fused (Pyro 
 
 Baker Ana!vze<i 
 
 45 cb 
 
 07 
 
 KIb. 
 
 .20 
 
 incl 
 
 
 
 
 
 
 
 
 
 
 
 Typ cal 
 
 
 
 
 
 
 
 00 ■" 
 
 
 
 
 
 
 
 
 \ i lb 36% 
 
 
 
 
 
 
 
 SODIIN 
 
 Bisulphide e- p 
 
 
 .50 cb 
 
 OS 
 
 Mlb. 
 
 .20 
 
 incl 
 
 
 Bisulphite pure powder 
 Bisulphite c p 
 
 
 .18 cb 
 
 .00 
 OS 
 
 " ' 'I'i ii.'. 
 
 
 
 SODIUJ 
 
 Paker Analyzed .... 
 
 .50 cb 
 
 .15 
 
 
 
 F 0011^ 
 
 
 
 
 
 
 
 
 a 00 1^ 1 
 
 Tpcal 
 
 
 
 
 
 
 
 fe< _o 00 f^ ' 
 
 
 
 
 
 
 
 00 1 
 
 
 
 
 
 
 
 
 ed DE 0^ b3 39 <" 
 
 
 
 
 
 
 
 SODIUM Bisulphile 
 
 Merck Blue Label ... 
 
 1.23 
 
 incl 
 
 ij lb. 
 
 .40 
 
 incl 
 
 
 h o de3 P3S than 00 % as C , 
 
 ruarantecd 
 
 
 
 
 
 
 
 r^e lesa than 000 -^ ' 
 
 
 
 
 
 
 
 SODIl\ 
 
 Bi tartrate c^V 
 
 Borate (Borax) pure crystals 
 
 Paker Analyzed . 
 
 1.00 Ob 
 15 cc 
 
 .09 
 04 
 
 'i lb. 
 
 ..55 
 
 incl 
 
 SODIUM 
 
 Borate (Borax), c. p., crystals. . 
 
 Fe 0001% 
 
 CaO nonel 
 
 CO= ; tracl^ 
 
 CI -0.0001%! 
 
 SO., -0 001% 
 
 Baker Analyzed . 
 
 Typical 
 
 Analysis 
 
 .55 cb 
 
 .03 
 
 H lb. 
 
 .17 
 
 incl 
 
 SODIU.VI 
 
 Borate (Borax) purest, crystals. 
 
 Proper Water content 47.1% 
 
 Carbonat« leas than 2% as CO; i 
 
 Merck Blue Label 
 
 Guarant.!e(l 
 Analysis 
 
 45 
 
 incl 
 
 H lb. 
 
 .20 
 
 incl 
 
 
 Chlorides leas than 0,0005% as CI 
 
 
 
 
 
 
 
 Calcium leas than 0.02% J 
 
 Tron leas than 0.0008% 
 
 Other metals none 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 SODIUM 
 
 Borate, crystals 
 
 Borate, crystals 
 
 Kahlbaum "C.f.A." . .. 
 Kahlbaum "C.f.A." .... 
 
 
 
 100 grm. 
 .WO grm. 
 
 .55 
 1.00 
 
 incl 
 
 
 
 
 incl 
 
 
 Residue on ignition 52.87%l 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 W^^" °°"< L, 10 f 
 
 Certified 
 
 
 
 
 
 
 
 Lime. „."■.■.".■.:;:;:::;: "one^^^^'^^ i 
 
 
 
 Heavy metals nonel 1 
 
 
 
 
 
 
 
 
 Content found 100.08% } 
 
 
 
 
 
 
 
 SODIUM 
 
 Borate (Borax), pure, powder. . 
 
 
 15 cc 
 
 .40 cb 
 
 .04 
 OS 
 
 ii Ih 
 
 
 
 
 
 17 
 
 incl 
 
 
 F« 0001%i 
 
 
 
 
 
 
 
 
 
 Typical 
 
 
 
 
 
 
 
 CI -0 O00l%t 
 
 
 
 
 
 
 
 
 90= -0.001%! 
 
 
 
 
 
 
 
 SODIUM 
 
 Borate (Borax), calcined, purest 
 
 Proper Water content, .not morethan 25%. 
 
 
 
 incl 
 
 H\b. 
 
 .35 
 
 
 
 
 
 
 
 Carbonates less than 2% as COi i 
 
 
 
 
 
 
 
 
 Suiphates4 lesa than 0.0875% aa SO J 
 
 Guaranleed 
 
 Analysis 
 
 
 
 
 
 
 
 Calcium less than 0.02% ( 
 
 
 
 
 
 
 
 Iron leaa than 0.0008% } 
 
 
 
 
 
 
 
 
 
 
 .60 cb 
 
 OS 
 
 Uib. 
 
 .22 
 
 
 SODIUM 
 
 Borate, c. p., anhydrous, powder 
 
 
 " 
 
 Borate, fused (Borax Glass) 
 
 
 25 cc 
 
 04 
 
 5 lb. 
 
 1.00 
 
 
 SODIUM 
 
 Borate, fused, purest 
 
 Carbonates less than 2% COs j 
 
 Chlorides leas than 0005% as CI ' 
 Calcium less than 0.02% / 
 Iron. less than 0.0008% I 
 Other metals none,' 
 
 Merck Blue Label .... 
 
 Guaranteed 
 Analysis 
 
 1..50 
 
 incl 
 
 Klb. 
 
 .50 
 
 incl 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 SODIUM Bromate, c. p 
 
 45 
 
 incl 4.30 cb 
 
 OS 
 
 >ilb. 
 
 
 
 
 Bromate 
 
 Bromi ies le.s than 03% as Br. 
 
 Merck Blue Label .40 
 
 
 
 
 
 
 
 
 
 
 " 
 
 Bromide, c. p 
 
 Baker Analyzed .... 
 
 80 cb 
 
 .IK 
 
 U lb. 
 
 .35 
 
 incl 
 
T H U R 
 
 O M P A N Y 
 
 . Calcium Hydrate (Soda LimeJ, 
 dry. for Nitrogen determina- 
 tions, granulated 4, 8 and 12 
 
 ■nesh Baker Analysed 
 
 NaOH 411^ ) 
 
 ice in other size packages 
 e pkg parpkg. conl. 
 
 Calcium Hydrate (Soda Lime), 
 moist, for Carbon Dioxide de- 
 terminations, granulated 4, 8 anti 
 12 mesh Baker Analyzed 
 
 XnOH 37c/) ^ . ■' 
 
 [ Carbonate, crystals (Sal Soda) 
 
 Carbonate, c. p., crystals Baker Analyzed 
 
 ^- 002%] 
 
 CaO 
 CI 
 [ Carbonate, cr>stals 
 
 ''ubtances Inaolulile in wati 
 
 bodiiim HjdroMdi, 
 
 Sulphates I 
 
 Chlorides 
 
 Silicates 
 
 Nitrates 
 
 Phosphates 
 
 Fotaa=;ium 
 
 Calcium 
 Maene-iuni 
 He.tvj mctala 
 
 [ Carbonate, crystals 
 
 Content 
 
 Chloride 
 
 Sulphate 
 
 Nitrate 
 
 Phosphate 
 
 Sodium Hjdrate 
 
 Potassium (flame reaction) 
 
 Arsenic 
 
 Heai y metals 
 
 \lLali!ie eirtha 
 
 —0 001% 
 
 Analysis 
 
 Merck Blue Label 
 
 w than 0.1% \ 
 I)12S% as SOj 
 )OOUl'„asCi / 
 
 less than on;"- as NjO. 
 
 leas than 00!% as PjOt 
 
 leii tliin0 4% K 
 
 less than OUOl '^ as NHs 
 
 le" than 0.002% 
 
 less th.in 0002%, 
 
 les.=i thin 00005%/ 
 less than 00003% 
 
 Kahlbaum ' 
 90 731 
 
 \l\ In 10 \ < 
 le / grams / Anal, 
 
 SODIUM Carbonate, monohj drated, gianul ir 
 
 " Carbonate, pure, dried pow a 
 
 SODIUM Carbonate, c p , anhjdrous Baker Analyzed 
 
 Fe O01''o 1 
 
 .40 cb .08 }i\b. .15 inc! 
 
 .40 cb .03 h'lb. -l^J 
 
 .10 inrd 10 1b. .30 incl 
 
 .25 cb .08 U'lb. .l.> inci 
 
 'C.f.A." 1000 grm. .90 incl 
 
 .10 cc .04 10 1b. .m incl 
 
 .15 cb .09 
 
 .30 cb .08 'ilb, .1.5 inc! 
 
 001% 'i Typical 
 
 
 Igmtio 
 
 020%! 
 310%/ 
 
 
 SODIUM Carbonate (anhydious) 
 
 Subitanre^ insoluble in water 
 
 Sodium H^droMde 
 
 Siiliihates 
 
 Chlorides " 
 
 gilicd.tes 
 
 Nitrates le'ii 
 
 Phosphites lea 
 
 Potassium 
 
 Ammonium compounds less 
 
 Calcium 
 
 Magnesium 
 
 Heavy mf'tals 
 
 lirsenic 
 
 SODIUM Carbonate, anhydrous 
 ■' Carbonate, anhydrous 
 
 Content 
 Moisture 
 Chloride 
 Sulphii'e 
 Nitrate 
 
 Merck Blue Label 
 
 less than 
 than 00120% as 
 .S3 than 0001% a 
 
 Silica 
 
 Sodium Hjdrate 
 Potassium (flame ri 
 Arsenic 
 Heavy metals 
 Ammonium Salt-f 
 llkahne earth-^ 
 Solubihti in Water 
 
 than 007% as N^Oj' 
 
 s than 001% as PiOs 
 
 less than 0.4% K 
 
 than 0001% as NHj, 
 
 less than 0.002% \ 
 
 less than 0.0002% \ 
 
 Kahlbaum ' 
 Kahlbaum ' 
 
 'C.f.A.' 
 'C.f.A.' 
 
 faint trace 
 
 500 grm. I.OO incl 
 1000 grm. 1.75 incl 
 
Maker of Brand 
 
 SODIUM Carbonate, c. p., anhydrous , . Baker Special 
 
 Fc 0U02%1 
 
 AliCj -O.001%l 
 
 CaO 0.005%f T..„i.,i 
 
 SiOs 0. 001% \ I ^''^". 
 
 CI 001% / *"""'«'^ 
 
 SOs — 0,001%l 
 
 "SODIUM Chlorate, c. p Baker Analyzeci 50 cb .07 
 
 " Chloride, pure 10 inrl 
 
 SODIUM Chloride, c, p., crystals Baker Analyzed 25 cb .08 
 
 Fe 0.0002%) 
 
 CaO -0.001%f ™„ . , 
 
 MgO -^0.001%^ P"',*^'- 
 
 my\\v^y^'^v^"\'.'.'.'.'.'.'.'.'.'.'.'.''(3ml %y 
 
 SODIUM Chloride Merck Blue Label 40 incl 
 
 Siilpliates less than O,00eii% as SOa\ 
 
 Alkaline earths leas than 0.01% as Ca i 
 
 Heavy metals none f 
 
 Magaesium leas than 0.0007% \ Guaranteed 
 
 Iodides , less than 0.15% as I / Analysis 
 
 Potassium., i.--.< ^ .r.^ t- i 
 
 Iron 
 
 SODIUM Chloride! c. p., crystals.'.' " Baker Spet 
 
 1;'V ''2"li Typical 
 
 le.9S than 0.15% as I / il 
 
 less than 0.18% as Ki 
 
 leas than 0.0003%! 
 
 .. less than 0.0003% as NHj/ 
 
 
 Analysis 
 
 Potassium , 
 
 Heavy riictals. . 
 
 le /grams / A 
 
 SODIUM Chloride, v. p., fused Baker Analyzed 
 
 fi(' 
 
 M%l 
 
 El 
 
 le /grams / Anal, 
 
 SODIUM Chloride, crystals Kahlbaum "C.f.A," 100 grm. 
 
 " Chloride, orystals Kahlbaum "C.f.A." 500 grm. 
 
 Content : n(1.9S% 
 
 so',' '.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'..'. '.V.'.'.'.'.'.'."OMl%y 
 SODIUM Chloride, fused Merck Blue Label 
 
 Sulphates less than 0.0066% as SOi\ 
 
 Alkaline earths leas than 0.01% as Cal 
 
 Heavy metals nonef 
 
 Masnesium leas than 0.0007% V Guaranteed 
 
 Iodides less than 0.15% as I / Analysis 
 
 Potassium leas than 0,18% as K 
 
 Tron ....less than 0,0003% , 
 
 .\mraonium less than 0.0003% as NFa/ 
 
 SODIUM Chloride, fused Kahlbaum ;'C.f..\." inO grm. .60 incl 
 
 " Chloride, fused K:i!dhaum 'T'.f.A." .500 grm. 1.40 incl 
 
 Content 100.00%" 
 
 Lime and Magtiesia 
 
 Ammonium salts 
 
 Potassium . . . _ , 
 
 Iron none /grams / Analysis 
 
 Heavy metals 
 
 Iodine 
 
 Sulphate 
 
 .SODIUM Chromate, e. p Baker Analyzed 90 cb .OS Ji !b. .3.5 incl 
 
 Citrate, c. p Baker Analyzed l.OO cb .OS U'lb. .3.5 incl 
 
 Ke 0.001%! 
 
 OiO 0,002% ( Typical 
 
 CI -0.001% (■ Analysis 
 
 yi': -0.001%,' 
 
 SODIUM Cobatlic Nilrite, c. p. (for Po- 
 
 tas.4iinii IJeleruiiuations) .50 incl 
 
 " Fluoride, technical .18 cc .04 
 
 Fluoride, c, p Baker Analyzed 70 cb ,0S 'i lb. .30 incl 
 
 " Formate, c. p Baker Analyze<l 1.00 cb .OS '4 lb. .3.5 incl 
 
 " Hydroxide, crude, powder, OS'v 10 incl 10 lb. .75 incl 
 
 " Hydroxide, crude, powder, OS'o-- (ireenbanic 10 lia. 1.00 incl 
 
 " Hydroxide, pure, granulated 
 
 (Ammonia free) 20 cb .OS 10 1b. 1.50 en .15 
 
 " Hydroxide, electrolytic 30 cb .08 M lb. .17 incl 
 
 SODIUM Hydroxide rurified Mfrck Blue Label 45 incl i,^ lb. .20 incl 
 
 SODIUM H droxide p I 41 ol 1 60 cb .08 i,^ lb. .20 
 
SODIUM Hydroxide, by Alcohol Merck Blue Label 65 incl M lb. .25 incl 
 
 '^'- '■ ' - - ..leaa than 0.025% ai '■ "■ ' 
 
 ^iilpli-ilofi leaa than 0.025% as SOA 
 
 Olili.ri Jca lass than 0.005% as CI \ 
 
 Nitrogoii less than 0.002% as NiOtI 
 
 Nitrogen ns nitrates f 
 
 nitrites, Aiimionia, etc... less than 0.00112 N\ C 
 
 ■"^''i-'aU'^ not i.iofo than i).m% as SiO^ / A 
 
 AluriLiniHi, no L over 0.032% i 
 
 (-■all I Li 1.1 l«aathu[i 0,005%l 
 
 IIf;ivy iiielald ;it must a trace 1 
 
 Sodium CarboDate content not over 4%/ 
 
 B content . ,, 
 
 SODIUM Hydroxide, with Lime Merck Blue Label 60 uicl K lb- -25 inc! 
 
 K^ro-is of (Carbonates. leas than 5% as CO; I ^ . . 
 
 \'itro2e„ , , ..not more than .00112 as as N \ ^"""'^i'^''^ 
 NitroECii noneaafree NHi) '*"''iJ^'3 
 
 SODIUM Hydroxide with Lime from Ice- 
 land bpar Merck Blue Label .80 iucl li oz. .30 incl 
 
 C:iil>nHs 1«3= than 0.001% as Cn „ „,„„,„„j 
 
 Ph. ,1 ite'. le-3 than 0.003% as P!04 ^"V^."^*"' 
 
 Siihliur Ilss than 0.0015% S i Analysis 
 
 SODIUM Hvdroxide, t p , from Sodium 2.25 cb .09 
 
 SODIUM H>dro\ide, from hodium Merck Blue Label .30 inoi 2..'>0 imd Jl lb. .80 incl 
 
 Sail liuW3 loss than 0.004% as "" ' 
 
 Chbndea leas than 0.0025% a 
 
 Nitrogen as nitrates 
 
 nitrites Ammonn etc . less than 0.00113% N I 
 Nitrogen less than 0.002% NsOj 
 
 Nitrites less than 0.00011% as N^i'A Guuranteml 
 
 Phosphates luss than 0.003%, as P;Ob / Analyais 
 
 Silicates nut more than 0,02% as HivA 
 
 Aluminum not more than 0.0010(5%l 
 
 Calcium less than 0.012%! 
 
 Heavj metals . none 1 
 
 Sodium Carbonate content .not more than 3.18%/ 
 
 SODIUM Hydroxide Solution I, 27%— Free 
 
 from Nitrogen Merck Blue Label 
 
 .not more than 0.0002% 
 
 SODIUM Hydroxide Solution II, 27%— 
 
 Free from Nitrogen Merck Blue Label 
 
 Sulphates less than 0.025% as SO) l 
 
 Chlorides iesa than 0.005% as CI J 
 
 Silicates not more tban 0.06% as SiOi I 
 
 Aluminum not over 0.032% \ f;,,„rnntPi>H 
 
 Calcium 0'005% ) A'Xaia 
 
 Heavy metals at most a trace/ 
 
 Sodium Carbonate content not over 4% I 
 
 Nitrogen as nitrates, ni- l 
 
 trites, Ammonia, eta less than 0.0002% I 
 
 SODIUM Hydroxide Solution III, 15%. . . Merck Blue Label 
 
 Sulphates less than 0.025% as SOa \ 
 
 Chlorides less thaa 0.006% asCli 
 
 Nitrogen as nitrates, ni- I 
 
 trites. Ammonia, etc less than 0.00112% NI niiaranipi'd 
 
 Silicates not more than 0.06% as SiOi > V^^i^' 
 
 Aluminum not over 0.032%/ """''^'^ 
 
 Calcium less than 0.05%l 
 
 Henvv metals at most a trace I 
 
 .Sodium Curbonate content not over 4%/ 
 
 SODIUM Hyposulphite (SeeThiosulphate) 
 
 " Indigosulphonate Merck Blue Label 
 
 " Indigosulphonate IMerck Blue Label 
 
 Water content, not over 10% ( Guaranlecd 
 
 Tested for Indigo Content t Analysis 
 
 SODIUM lodate, c. p 60 incl 
 
 Iodide, c. p -50 mel 
 
 " Molybdate. 
 
 Monosulphonate (Alizarine) 55 cb .04 
 
 incl 3.50 cb .08 
 
 .04 
 
 ° " Nitrate, crystals 
 
 " " Nitrate, c. p., crystals Baker Analyzed 23 cb .08 
 
 CaO no'ie) 
 
 ^f lW.7'r'- 
 
 so, ;■:: .::::::::"-o:ooi%k ■*"^'^^'' 
 
 I none! 
 
 "SODIUM Nitrate, crystals Merck Blue Label 60 incl ?i lb. 
 
 Sulphates leas than 0.0025% as SOj\ 
 
 Chlorides less tlian 0.0015% as 01 I 
 
 Chlorates and ^, r, I 
 
 PercUloratea . ..leas Ihao 0.00a% as ChOtl 
 
 Calcium leaa than 0.01% \ 
 
 Heavy metals ■ 
 
 Iron lessthanO 
 
 Nitrites - Iesa than 0.00Od5% a: 
 
 lodates less than 0.004% o 
 
 Potassium less than 
 
 "SODIUM Nitrate, crystals Kahlbaum "G.f.A." 100 grm. 
 
 53 
 
 ,a than 0.01%, \ ( 
 
 none/^ 
 
 than0.0008%i 
 155% as NjOj I 
 004%asl!OsT 
 3 than 0.33%/ 
 
Oui.ce and pound PI 
 
 "SODIUM Nitrate, crystals 
 
 Chloride , .nor 
 
 Chlorate, Perchlorate noi 
 
 Sulphate.. noi 
 
 lodate noi 
 
 Nitrite .noi 
 
 Potassium (Same re- 
 action) slight trai 
 
 .-Vlkaline earths uoi 
 
 Heavy earths , noi 
 
 SODIUM Nitrite, coml., granular.. 
 " Nifrite, c p crystals 
 
 PI 
 
 'granjs ,' / 
 
 Maker or BranJ 
 Kahlbaum "C.f.A-' 
 
 Baker Analyzed 
 
 olher ilie packages 
 
 .jOO grm. l.IO IdcI 
 
 .22 cb .OS 
 
 .45 cb .09 '4 lb. .1.5 
 
 Baker Analyzed 
 
 [ 
 
 SODIUM Nitrite, c p sticks 
 
 lAiKihsis as abo-ve) 
 
 SODIUM Nitrite, sticks Merck Blue Label 
 
 Chlori.len less than 0.002% as Cn ,. , , 
 
 Siilphrites less than 0,175% as SOs^ V " ,' ?„ 
 
 Iloavvnetals ..nonef *n«'VH'« 
 
 SODIUM Nitrite, Potassium free Merck Blue Label 
 
 Fota^iiiiira less tlian 0.0^% as Ki 
 
 Clilorifles less than O.dKTo as CM Gueranleed 
 
 .Sulphates less than 0.175% as WOjj"' Analysis 
 
 Heav.v metals none/ 
 
 SODIUM Nitroferricyanide (Nitroprusside) , 
 
 " Nitroferricyanide Merck Blue Label 
 
 .Sulphate less than 0.01% as S( tj 
 
 " Oxalate, coml , ponder 
 
 SODIUM Oxalate, c p Baker Analyzed 
 
 000) , 
 
 -sss;:-, '?"■"■. 
 
 -0 OOl'-f 
 
 CaO 
 
 SODIUM Oxalate, ■ 
 
 SODIUM 0\tI im 
 
 p fni st mdardlzmg 
 
 i\ 
 
 Baker Special 
 aierck Blue Label 
 
 n 0212?"^ 1 
 n 0224'~ f 
 
 .50 cb .OS ?4 lb. .15 inci 
 
 1.20 incl '4 lb. .40 incl 
 
 Hlh. .90 incl 
 
 .40 •■}> .04 
 .80 incl 
 
 3-402. .SO incl 
 
 .2.5 cc .04 
 
 .60 cb .OS 1-4 lb. .20 incl 
 
 I4 lb. .50 incl 
 M lb. .60 incl 
 
 Potaasiujii 
 
 Purcigti organic nubatanre 
 
 SODIUM Oxalate 
 Oxalate 
 
 -odium Carbonate 
 3ino-.al.,te 
 'rginir roin pound'" 
 
 J- 
 
 I ( 
 
 le^ in 10 V C 
 If /gram-./ f 
 
 Kahlbauin 
 Kahlbaum ' 
 
 'C.f.A." 
 'C.f.A." 
 
 B'lkor Analyzed 
 
 0021 i 
 
 0003%' Typical 
 0002%/ \nalysi8 
 
 OOl"" ' 
 
 Merck Blue Label 
 
 SODIUM Perborate 
 
 " Permanganate 
 
 * " Peroxide 
 *SODIUM Peroxide, c p 
 
 Pe 
 
 Al O3 
 C! 
 
 Insoluble matter 
 *SODIUM Peroxide 
 
 Sulphates less than 0,014% as 
 
 Chlorides leas than 0.0015% as CI / 
 
 Phosphates leas than 0.06% as PiOt' Guaranleed 
 
 KitroEen less than 0.003'?{ / .inalvsis 
 
 .'^ilicatf.s not more than 0.01% as SiOi I 
 
 Ifuavy metals none ' 
 
 'SODIUM Peroxide, Carbon free 
 
 * " Peroxide, c. p., for coal analysis Baker Special 
 
 '' " Peroxide, c. p., fused 
 
 " Phosphate, c. p., monobasic 
 
 (■NaH2P04+4H50) Baker Analyzed 
 
 Fe 0.0001'!^ 1 ~ . , 
 
 CI -0.00I%[ ^^P"^"'- 
 
 SO, -0.001% 
 
 100 grin. 1.10 incl 
 500 grm. 3.45 incl 
 
 I4 lb. ..30 
 
 .85 
 1.00 
 
 ^4 Ih. 
 I4 lb. 
 
 100 grm. .70 
 
 
 incl 
 incl 
 
 SODIUM Phosphate, pare, crystals, dibasic 
 
 
 1.30 incl 
 
 ■■ulb. 
 
 a lb. 
 
 
 
 .15 
 
 .20 
 
 incl 1.25 incl 
 incl 1.50 incl 
 
 .45 
 
 incl 
 
 incl 
 
 
 75 cb .08 
 
 >, lb. 
 
 .25 
 
 incl 
 
 
 10 cb .09 . 
 
 
 
 
Phosphate, anhydrovis, powder, 
 
 dibasic 
 
 Phosphate, c. p., dibasic 
 
 (NaaiP04+12H,0) Baker Anatyzed 
 
 ^'e 0.0005%i 
 
 ^? trace (. Typical 
 
 CI -0,001% ( Analysis 
 
 SO3 0.005 %,' 
 
 ! Phosphate, dibasic 
 
 (\i HP(J4+12HaO) Mei.k Flue Label 
 
 ( irl on iti.3 less that! ''"{ a, 
 
 ^ululiaUa less than 0075 "c . 
 
 les'f than 0015 ^ 
 
 s than 0016~u aa 
 
 ( h Ion del 
 Nitritea 
 IIea\ \ metals 
 Arsenic 
 Potassiuin 
 
 : Phosphate 
 Phosphate 
 
 I bf Is I 
 
 m 
 
 1005% I 
 
 Analysis 
 
 Po 
 
 i(flar 
 
 , anh-^d 
 
 dibasic 
 
 Kahlbaum ' 
 Kahlbaum 
 
 'C.f.A.' 
 'C.f.A.' 
 
 SODIUM 
 SODIUM 
 
 Phosphate, c p , 
 
 Phosphate, c. p., dibasic, (Ar- 
 senic free) Baker Special 
 
 Phosphate, coml., granular, tri- 
 
 basic 
 
 Phosphate, c p tribisic 
 
 (Na3P04+12H.U) Baker Analyzed 
 
 C 1 056% \ 
 
 '^Oi 003 ,1 Typical 
 
 Nitrate In ' 
 
 Phosphate, c p meta (NiPOj) 
 
 Picrocarminate Solution, tested 
 
 reagent 
 
 Potassium Carbonate, c. p 
 
 NaiCOa 3H% 
 
 KiCOa B4% 
 
 Fe 0,001% I 
 
 SiO; 0,0027o 
 
 CI 0.001% I 
 
 SO3 0,002%' 
 
 " Potassium Carbonate. 
 Potassium Carbonate. 
 
 J ree alkali 
 
 < hloride slight 
 
 Sulphate 
 
 Kahlbaum "C.f.A.' 
 Kahlbaum "C.f.A.' 
 
 iJ, 
 
 Merck Blue Label 
 
 Tliioaulphjte t 
 
 Alkaline eartha 1 
 
 IIeav> meta la i 
 
 Arsenic i 
 
 [ Potassium Carbonate, fused, an- 
 hydrous, tested reagent 
 
 Potassium Phosphate, c. p 
 
 Potassium Tartrate, crystals 
 
 (Rochelle Salts) 
 
 Potassium Tartrate, powder 
 
 (Rochelle Salts) 
 
 Potassium Tartrate, c. p. cryst . . * Baker Analyzed 
 
 PotassiumTartrate,c. p., powder Baker Analyzed 
 
 Fe... 
 
 0.001? 
 
 CaD none 
 
 n 0.0002% 
 
 SO..V -0.001% 
 
 I Potassium Tartrate, crystals — 
 
 Calcivim less than 0.03% 
 
 Heavy metals none 
 
 Chlorides leaa than 0.0005% 
 
 Sulphates less than 0.175%, a 
 
 Ammonium 
 compouDds less than 0.0045% as 
 
 Typical 
 
 .Analysta 
 
 Merck Blue Label 
 
 pound prices Price in other size packaee) 
 
 per Ih, conl, 5i;e pkn. per pkg, tont. 
 
 .22cll .09 
 
 .35 cb .f]8 l.i lb. .15 incl 
 
 1.00 incl 1.1 lb. .35 incl 
 
 Merck Blue Label .30 
 Baker Analj'zed .... 
 
 100 grm. .75 incl 
 500 grm. 1.65 incl 
 
 .60 cb .08 lilb. .20 incl 
 
 .50 cb .08 h lb- .20 incl 
 
 .10 CO .04 
 
 .90 cb .08 'j lb. .Z(i incl 
 
 1.20 cb .08 'ilb. .40 incl 
 
 1 
 
 -50 cb .08 ii lb. .20 incl 
 
 100 grm. .50 incl 
 500 grm. 1.10 incl 
 
 1.2.5 incl 
 .50 cb .07 
 
 141b. ..50 incl 
 141b. .20 incl 
 
 .32 cc .04 
 
 .70 cb .08 H lb. .24 
 
 .75 cb .08 14 lb- .24 
 
 I4 lb. .30 incl 
 
 nhJ 
 
C O M P A N V 
 
 SODIUM Pyrophosphate, c. p., crystals. . . 
 
 le 0.0003%, 
 
 Msn. 
 
 l 3,3 NiOs/ f 
 
 iVo.ooor/'il 
 
 1A% as K/ 
 
 SODIUM Pyrophosphate 
 
 Phosfjliatftj less than 2% as PiO I 
 
 SalphaUjs loss than 0.0075% aa SO; 
 
 Carbonate.3 iesa than 2% as CO- 
 
 Chlorides less than 0.0015% as CI 
 
 Nitratfs le.HS than 0.0016% as NiOi 
 
 Heavy niotals 
 
 Aracnio less than 
 
 PDUiisiiiiii less than 0.4' 
 
 SODIUM Pyrophosphate, c p , dry 
 " Silicate, comi , aolutioQ 
 
 " Silicate, coral , diy lump 
 
 " Situate, toml powder 
 
 " Silicate,c p Li\stah 
 
 " Silicofluoride, c p 
 
 " Stannate, c p 
 
 " Sulphate, pure, en st or powdi-r 
 
 " Sulphate, c p (.ijbtals 
 
 le -0 0001':' 1 
 
 -0 001% ( 
 
 Mskeror EramJ 
 
 Baker Analyzed 
 
 Typical 
 
 Analysis 
 
 Merck Blue Label 
 
 Balver 'indlyzed 
 
 ' aU 
 Mgo 
 SODIUM Sulphate 
 
 Substances insoluble in nater 
 
 Merck Flue Label 
 
 SODIUM Sulphate 
 
 Chloride 
 Alkaline earths 
 
 3 than 001% aa CI 1 
 
 1. 1-f than O00S% , 
 
 less than 02%( 
 
 less than (\0a°} t 
 
 less than 0005% 
 
 Kahlbauiii "C.f.A.' 
 
 .60 cb .07 li lb. .20 incl 
 .80 incl H lb. .30 incl 
 
 1.00 cb .OS 
 
 .10 cb .08 
 
 .16 cc .08 
 
 .20 cc .04 
 
 .80 cb .OS 
 
 1.00 cb -OS 
 
 1.00 cb .OS 
 
 .10 cb .09 
 
 .25 cb .08 
 
 li lb, .3-5 incl 
 1 gal. .50 inci 
 
 H lb. .25 incl 
 
 K lb. .35 incl 
 
 }4 \h. .35 incl 
 
 '}4 lb. il5 ' ' ' incl 
 
 1000 5^no. .90 incl 
 
 SODIUM Sulphate, c p , anhyd , powder 
 
 Fe 0003'c 
 
 CiO ijont 
 
 MgO none 
 
 CI 0001% 
 
 "SODIUM Sulphide, fused 
 
 " " Sulphide, brown, crystals 
 
 ° " Sulphide, c p crystals 
 
 Fe 0,0005% 
 
 CI 0.010% 
 
 BOi 0.050% 
 
 Polvaulphide trace 
 
 'SODIUM Sulphide 
 
 Nitrogen not more than 0.0056% 
 
 'SODIUM Sulphide 
 
 " " Sulphide 
 
 Solubility complete 1 
 
 Baker Analyzed 
 
 I Typical 
 / Analysis 
 
 Baker Analyzed 
 
 I Typical 
 f Analysis 
 
 Merck Blue Label 
 
 Kahlbaum "C.f.A.' 
 Kahlbaum "C.f.A.' 
 
 10 ! 
 
 Content, calculated on crya- r ^,,„^ 
 
 tallized sulpbide 98.7% \ ^•^'"'^ 
 
 Moist nre remainder ) 
 
 "SODIUM Sulphide, Solution, 5% 
 
 >;ilroEon not more than 0.00058% 
 
 " Sulphite, pure, crystals 
 
 SODIUM Sulphite c p cryst Is 
 
 Fe 0003% 1 
 
 CaO -on l%f „ 
 
 <- n -0 1%^ 
 
 001% I ' 
 
 Merck Blue Label 
 
 Baker Analyzed 
 
 sua 
 SODIUM Sulphite, crystals 
 
 Ch oridcs less than 002% as CI 
 
 Hea etala one 
 
 Vr-i leas thin 0002% 
 
 SODIUM Sulphite anhydious powder .. 
 " Sulphite, c. p., anhydrous 
 
 Fe 0,0005% 
 
 CaO 0,005%! 
 
 SiOi -0,001% 
 
 CI 0,010% 
 
 SO] jjrcsent 
 
 SODIUM Sulphite, dried 
 
 Chlorides less than 0.002% as CI ) 
 
 Heavy metals nooe} 
 
 Arsenic less ttian 0,0002% ] 
 
 SODIUM Tartrate, c. p 
 
 Merck Blue Label 
 
 Baker Analyzed 
 
 Merck Blue Label 
 
 Baker Analyzed 
 .56 
 
 .35 cb .07 U lb. .15 incl 
 
 .30 cb -OS 
 
 .10 cb .08 
 
 .40 Kb .lo 'i lb. .15 
 
 .6.5 incl ii lb. .30 incl 
 
 100 grm. .55 incl 
 
 .500 grm. ,95 incl 
 
 .60 incl )ilb. .30 incl 
 
 ,10 cc .04 
 
 ,25 cb .08 H lb. .15 incl 
 
 ..50 incl }.i lb. .20 incl 
 
 .15 CO .04 
 
 .30 cb .07 "Mlb. .15 incl 
 
 .85 iucl U lb. .30 incl 
 .75 cb .03 Jflb. .25 incl 
 
SODIUM Taurocholate, for use in bac- 
 teriological work 
 
 " Tetraoxalate, c. p 
 
 Thiosulphate. (Hyposulphite), 
 
 pure, crystals 
 
 Thiosulphate, c p , ervstals Baker Analyzed 
 
 ^" 0001'"^ 
 
 p.r. 
 
 
 ...1, 
 
 per lb 
 
 
 ..1. 
 
 f/e pkB. 
 
 per pkg. 
 
 cent. 
 
 6.00 
 
 ■b 
 
 .0-1 
 
 inrl 
 
 
 
 
 1.5 RT. 
 
 ;., lb. 
 
 .40 
 .70 
 
 
 .20 
 
 2.00 
 
 cb 
 
 .OS 
 
 incl 
 
 
 
 
 .10 
 
 cc 
 rb 
 
 .04 
 .OS 
 
 ' 'I'f ib. 
 
 .1.5 ' ■ 
 
 
 
 
 
 incl 
 
 
 ^1 : 
 
 250%/ J 
 
 Tree =1 
 
 SODIUM Thiosulphate. orjstals 
 
 I jrljc Ti itP'i le-is than 17% as Cu 
 Siilrliitcsaiid 
 
 sulpiiitQS leas thfto 01% as fcu 
 
 Tree alkali leas tli m 01% as NaOH 
 
 NulEhiJos less than 013% as S' 
 
 (^i' lum leas thin 002% 
 
 SODIUM Thiosulphate 
 " Thiosulphate 
 
 Trcp alkalies 
 
 ■^ulpl ite 
 
 '^iil[hiti 
 
 Sulphi lo 
 
 Cirl ouat« 
 
 Lime 
 
 Oaiitont 
 
 Sfechanical moiature 
 
 SODIUM Thiosulphate. c 
 " Thiosulphate, c. p., 
 
 Merck Blue Label 
 
 'LI 
 
 IB /grama / A 
 
 i) ) 
 
 Kahlbaum "C.f.A.' 
 Kahlbaum "C.f.A.' 
 
 incl i^lb. .20 
 
 500 grm. .75 
 1000 grm. 1.15 
 
 cr-\ stals 
 anhydrous . 
 
 
 Fe 0.002%i 
 
 CaO -0.001% ( 1 
 
 SO3 O.SOO%1- A 
 
 FreaS trace,' 
 
 SODIUM Tungstate, pure, crystals 
 
 " Tungstate. c. p 
 
 SODIUM Tungstate 
 
 Proper water content 12% 
 
 Chbricies leas than 0.001% as CI 
 
 Sulphates less than 0,075% aa SOa 
 
 SODIUM Tungstate. 
 
 Sulphate 
 
 Chloride 
 
 Residue on ig _ , 
 
 Tungstic acid 69.70% 
 
 SOLUTION, Acid Phosphomolybdic. 10%,. 
 
 Acid Phosphotungstic, 10%, . 
 
 Alizarin, (Sodium Monosul- 
 
 f>lionate) for detection of 
 
 free IICl in stomach 
 
 Boas', for detection of HCI 
 
 in gastric juice 
 
 Chloro-iodide of Zinc, after 
 
 Schultz 
 
 Congo Red, for detection of 
 
 free HCI in stomach 
 
 Dimethyl -aniido - azo - benzol. 
 0.5%, for gastric j uice 
 
 analysis (Toepfer) 
 
 Doremus, for estimatins 
 
 amount of Urea in Uric Acid 
 
 Ehrlich's, (Diazo Reaction), , 
 
 Esbach's, for estimating 
 
 amount of Albumen in urine 
 
 Fehling's, Alkaline 
 
 Fehiing's, Copper . 
 
 Fehling's, in tablet form, in 
 cartons containing 24 tab- 
 lets each 
 
 Gas, for analysis with Orsat 
 Apparatus. 
 I. Potassium Hydroxide 
 solution for absorb- 
 ing COa .,. 
 
 II. Ammoniacal solution 
 Cuprous Chloride for 
 
 absorbing CO 
 
 Ill, Potassium Pyrogallate 
 solution for absorb- 
 ing 
 
 Baker Special 
 Baker Analyzed 
 
 .40 cb .OS 
 ..50 cb .07 
 
 ,iflb. .15 
 
 Merck Blue Label 
 
 1.25 cb -OS 
 
 .20 incl 2.00 cb .08 H 'b. .70 
 
 .30 incl I4 lb, .SO 
 
 Kahlbaum "C.f.A.' 
 
 .15 gb .05 .80 incl 
 .15 cb .03 1.00 cb .08 
 
 20 cb .08 
 
 .15 ch .03 1.25 cb .08 
 
 .50 t;b ,05 
 
 80 cb .08 
 
 .15 
 
 incl .75 cb .08 
 
 .60 gb .12 
 .30 gb .12 
 
 .25 cb .OS 
 
 .50 cb ,0S 
 ..50 gb .12 
 
 Bur'ghs Welcome 
 
 .80 incl 1 liter 1.40 
 .80 in<I 1 liter 1.40 
 
 .80 incl 1 liter 1.40 
 
 incl 
 incl 
 
 incl 
 
 incl 
 
 50 grm, .90 incl 
 
 incl 
 incl 
 incl 
 
SOLUTION, Giinzberg's, for detection of 
 
 HCI in gastric juice 
 
 " Haines', for detection of 
 
 Sugar in urine 
 
 " Hayem's, for diluting blood . . 
 
 " Hypobromite, for use m Dore- 
 
 mus Ureometer 
 
 1.00 i 
 
 .25 cb 
 
 .60 gb 
 .60 gb 
 
 .20 
 
 .25 gb .12 
 
 I 2.00 gb .12 
 
 lOOOgrm. 3.50 
 
 incl 1.00 
 incl 1.25 
 incl 1.00 
 
 " Iodine, for detection of Starch , 
 
 Alkaloids, and Alcohol 
 
 " Labarraque's 
 
 " Lacmotd, indicator 
 
 " Litmus, indicator 
 
 " Litmus, according to Kubel 
 
 and Tiemann, in original 
 
 packages Kahlbaum 
 
 " Litmus, according to Kubcl 
 
 and Tiemann, in origin^] 
 
 packages Kahlbaum .... 
 
 " Lugol's 
 
 " Methyl Orange, indicator 15 
 
 " MiHon's, for detection of 
 
 Proteids .25 
 
 " Nessler's, for detection of 
 
 Ammonia and its salts .15 
 
 " Nyiander's 15 
 
 *' Obermayer's .25 
 
 " Phenolphthalein, 1% alco- 
 holic solution ..50 t'b .08 
 
 " Phloroglucin-Vaniiiin, for de- 
 
 tection of HCI in gastric 
 
 juice 60 cb .03 
 
 Platinic Chloride, c. p., 5% 2.00 incl 
 
 Platinic Chloride, c. p., 10% 3.25 incl 
 
 " Resorcin, for detection of HCI 
 
 in gastric juice 15 gb .05 1.40 gb .12 
 
 " Ruhemann's I, for estima- 
 tion of Uric Acid 25 cb .08 
 
 " Ruhemann's II, for estima- 
 tion of Uric Acid 28 cb .07 
 
 " Soap, for water analysis 1.00 gb .12 
 
 " Soda, Chlorinated, (L a b a r - 
 
 raque's) 20 incl 
 
 " Toepfer's, for gastric juice 
 
 analysis 15 incl .75 cb .08 
 
 " Toisson's, for diluting blood .50 cb .08 
 
 " Tropaeolin OO, for detection 
 
 of HCI in gastric juice 1.00 cb .08 
 
 " Tumeric, indicator 15 incl 1. 00 cb .08 
 
 STANDARD VOLUMETRIC SOLUTIONS are not carried in stock because of theirunstable natun 
 order is, therefore, made up specially and cannot be shipped until the day after order is received. 
 
 ACID, Hydrochloric, deciuorinal. 
 
 " Nitric, decinormal 
 
 " Oxalic, decinormal 
 
 " Sulphuric, decinormal , . . 
 
 AMMONIUM Sulphocyanide, decinormal . 
 
 IODINE, decinormal 
 
 POTASSIUM Bichromate, decinormal 
 
 " Hydrate, decinormal 
 
 " Permanganate 
 
 SILVER NITRATE, decinormal 
 
 SODIUM Carbonate, decinormal 
 
 " Chloride, decinormal 
 
 " Hydrate, decinormal 
 
 " Thiosulphate, decinormal 
 
 SORBIT 
 
 STARCH, corn 
 
 " iodized 
 
 " potato, , 
 
 soluble 
 
 " wheat 
 
 STRONTIUM Acetate, c. p 
 
 " Carbonate, pure, pptd 
 
 liter 
 liter 
 liter 
 liter 
 liter 
 liter 
 liter 
 liter 
 liter 
 liter 
 liter 
 liter 
 titer 
 liter 
 
 Each 
 
 1.25 gb .18 
 1.25 gb .18 
 1.25 gb .18 
 1.25 gb .18 
 1.35 gb .18 
 1.35 gb .18 
 1.25 gb .18 
 1.25 rb 
 1.25 gb 
 1.35 gb 
 1.25 gb 
 1.25 gb 
 1.25 rb 
 1.25 gb 
 
 Baker .Analyzed 
 
 .10 cc .04 
 
 .15 cc ' .04 
 
 1 .80 cb .09 
 
 .30 incl 
 
 1.25 cb .OS 
 
 M rb .09 
 
 K 111. 
 
STRONTIUM Carbonate, 
 
 Baker Analyzed 
 
 STRONTIUM Chloride, pure, crystals. 
 " Chloride, c p 
 
 105% ( ,' 
 
 Baker Analyzed 
 
 per lb. cont. 
 
 IZ9 pkg. 
 
 per pkg. 
 
 PPM. 
 
 .50 cb .0,S 
 
 li lb. 
 
 .20 
 
 inci 
 
 .2.5 cb .00 
 
 
 
 
 H lb. .20 incl 
 
 STRONTIUM Chloride. 
 
 Baker Special 
 
 incl 
 
 STRONTIUM 
 "STRONTIUM 
 
 I'luondt^ L p 
 H\dro\ide, c p 
 Nitrate, gimulir 
 Nitrate, ( p 
 
 Baker Analyzed 
 
 0005% 1 
 001%( 1 
 001%/ f 
 
 Baker Analyzed 
 
 1.00 cb .08 
 
 1.00 cb .OS 
 
 .20 cc .04 
 
 1 .50 cb .07 
 
 "STRONTIUM Nitrate 
 
 STRONTIUM 
 STRONTIUM 
 
 Oxalate, c p 
 
 Oxide, c p , h\drated 
 
 Sulphate, c p 
 
 Cl 
 
 Baker Special 
 '<■') 
 
 ol Typical 
 e ( Analysis 
 
 Baker Analyzed 
 Baker Analyzed 
 
 ei Typical 
 
 '' I Analysis 
 
 STYRAX 
 
 SULPHIDE Cubes ' (See Cubes)'.'. '. '. '. 
 
 SULPHITE Cubes (See Cubes) 
 
 SULPHUR, rolls (Brimstone) 
 
 " sublimed (Flowers of Sulphur) 
 
 " washed 
 
 " precipitated 
 
 " crystals 
 
 " Dioxide, gas. in valve top 
 
 cylinders of 7 lbs. ea., 
 
 " Monochloride 
 
 "SYNTHOL 
 
 TALCUM, powder 
 
 TANNIN (See Acid Tannic) 
 
 Tartar Emetic (See Antimony Potassium 
 
 Tartrate). 
 TEST PAPER, Congo, sheets 210 X 250mm 
 " " Congo, in books of 25 strips 
 " " Congo, vials of 100 strips. . 
 " " Congo, tape form in rolls. . 
 " " Litmus, blue, red or neu- 
 tral in sheets, 210 x250 mm. 
 " " Litmus, blue, red or neu- 
 tral, in books of 25 strips.. 
 " " Litmus, blue, red or neu- 
 tral, in vials of 100 strips.. 
 " " Litmus, blue, red or neu- 
 tral, in tape form 
 
 " " Litmus, red and blue com- 
 bined, tape form 
 
 " " Tumeric, sheets, 2'0x250_mm 
 
 " " Tumeric, books of 25 strips 
 
 " " Tumeric, vials of 100 strips 
 
 " " Tumeric, tape form 
 
 TETRAMETHYL - PAEAPHENYLENE - 
 
 DIAMINE HYDROCHLORIDE 
 
 TETRAMETHYL - PARAPHENYLENE - 
 DIAMINE HYDROCHLORIDE 
 
 Inorganic matter less than 0,05% 
 
 THALLIUM, metal 
 
 " Nitrate 
 
 .10 cc .04 
 .10 cc .04 
 .15 cc .04 
 .16 cc .05 
 .50 incl 
 
 }4 lb. .35 incl 
 ' '}4 'lb. .20 inci 
 
 .90 cb 
 
 .on 
 
 '-1 lb. 
 
 ..■!5 
 
 incl 
 
 .00 cb 
 
 117 
 
 
 
 
 .50 cb 
 
 .07 
 
 Klb. 
 
 .20 
 
 incl 
 
 Merck Blue Label 
 Merck Blue Label 
 
 1.80 
 1.80 
 
 .50 gb .20 
 .45 cb .09 
 .10 cc .04 
 
 per oyl. 6.00 
 
 quire .75 
 
 book .05 
 
 vial .10 
 
 roll .10 
 
 quire .75 
 
 book .05 
 
 vial .10 
 
 roll .10 
 
 roll .25 
 
 quire .75 
 
 book .05 
 
 vial .10 
 
 roll .10 
 
 5 grn. .75 
 
 15 grn. 2.00 
 
 1 grm. .15 
 
 1 i;rrii. .15 
 
 incl 
 incl 
 
 incl 
 incl 
 incl 
 incl 
 inc! 
 
ARTHUR 
 
 11 . T H O M 
 
 A S 
 
 
 G o r4 
 
 P 
 
 A N 
 
 Y 
 
 
 Maker or Brand 
 
 Merck Blue Label 
 
 ■■■''^^^^'^" "Si Guaranteed 
 
 Oun 
 
 1.80 
 
 .50 
 1.00 
 .25 cb 
 .35 
 
 tesnd 
 
 iocl 
 
 incl 
 incl 
 .04 
 incl 
 
 p...d „!.„ P, 
 
 i.= l.«h, 
 
 ^rsi^enack. 
 
 ages 
 
 THALLIUM, Sulphate 
 
 THORIUM, metal, c. p 
 
 " Nitrate, c. p... 
 
 " Sulphate, c. p. 
 
 THYMOL, crystals 
 
 THYMOL 
 
 6.50 incl . . 
 S.'lO cb ' '.OO '. '. 
 
 ■0 Pkg. 
 Igrm. 
 1 grm 
 
 jV ib^ 
 
 1 ( lb. 
 
 ;.i lb. 
 
 i;ib. 
 
 per pkg. 
 .15 
 1.80 
 
 incl 
 incl 
 
 
 
 
 
 1.00 
 
 
 
 .15 incl . . 
 .90 incl . . 
 
 .90 incl 
 1.00 cb .04 
 
 1.50 incl 
 
 
 
 
 
 TIN. foil, coml 
 
 
 
 " foil, pure (Lead free).. 
 TIN. metal, granulated (mi 
 
 
 
 
 
 
 D&s\), shot or 
 
 Baker -^nalj'zed 
 Baker \nalyzed 
 
 0003 "„ J 
 "001"^ Typical 
 
 trace ' 
 
 Merck Blue Label 
 
 
 
 .25 
 .25 
 
 .50 
 
 incl 
 
 *" metal, powdered 
 Pb 
 
 Zn 
 
 Cu 
 As 
 TIN, metal eranulited 
 
 
 
 incl 
 
 
 
 incl 
 
 I ead not more than 00683% i 
 
 foiiper leas than 0004% f (-■„-,__,po<1 
 
 ArsLni at moat a trace' 
 
 TIN Chloride crjstals (atitinous) 45 cb .OS 
 
 " Chloride, c p,, (''tannous) Baker ^.nalyzed 70 cb .07 'lib. .24 incl 
 
 SO. nonei -^""'i'" 
 
 TIN Chloride, (stannous) Merck Blue Label .20 incl J- 2 lb. .75 incl 
 
 Sulphates leas than l''3% aa SOj i 
 Ammonium compounds less than 0035% as NHs f nnarAnloed 
 
 Eartba and alkalies not more than 1% ^ »" ,' "ji 
 
 Iron leas than 0000, S^l Analysis 
 
 Arsenic leaa than 000"5% 1 
 
 TIN Chloride, crystals (stannous) Kahlbaum "C.f.A." 100 grm. .95 incl 
 
 " Chloride, rrystals (stannous) Kahlbium "C.f.A." 500 grm. 2.70 incl 
 
 Content (SuCb + 2HiO) 
 Real due present after preoipi 
 tatingTin 1 2 rofe 
 
 
 % i Typica 
 % i Analy; 
 
 Arsenic uuue i - 
 
 \mmonium salts faint trace) } 
 
 Sulphate none 
 
 TIN Chloride, c p , crystals, (stannic) Baker Analyzed 75 gb .15 M lb. .25 mcl 
 
 Fe 0002% 1 
 
 As trace I Typical 
 
 'iOs none f Analyaia 
 
 TIN Chloride, c p , fuming, (stannic) 1.00 gb .15 i-i lb. .35 incl 
 
 TIN Chloride, Solution Merck Blue Label 1 .20 inc. H lb. .40 incl 
 
 Siihstance precipitated by Alcohol none I Guaranteed 
 
 Sulphuric Acid less than 0.002% as SOj ! Analysis 
 
 TIN Oxalate, e. p., (stannous) Baker Analyzed 1.25 cb ,07 M lb. .45 incI 
 
 " Oxide, c. p., (stannous), 20 incl 2.00 cb .06 H lb. .70 incl 
 
 " Oxide, c. p., (stannic) Baker Analyzed 90 cb .06 ^i lb. .35 incl 
 
 Fe 0.0002%~1 
 
 CI 0.010% ( 
 
 BOi 0.001% ( 
 
 Na trace ' 
 
 TIN Phosphate, e. p., (stannous) Baker Analyzed 2.50 cb .OS 3^i lb, 
 
 " Sulphate, c. p., (stannous) Baker Analyzed 1.25 cb .07 }i\h. .40 incl 
 
 Fc 0.0002'! 
 
 As none ( Typical 
 
 CI -0.001% ( Analysis 
 
 Na trace' 
 
 TIN Sulphide, c, p., (stannous) Baker Analyzed 1..50 cb .OS M Ih. .50 incl 
 
 " Sulphide, c. p., (stannic) 2.50 cb .OS }_i]h. .80 mcl 
 
 TITANIUM, metal, c. p 3.50 incl 1 grm. .20 incl 
 
 " Sulphate, pure 1-10 incl Igrm. .1,5 inel 
 
 " Oxide (See Acid Titanic). . . . 
 
 " Potassium Oxalate, c. p 75 cb .07 H lb. .25 incl 
 
 TOLUIDINE, ortho, c. p 1-00 cb .08 
 
 para, c. p 3.50 cb .08 
 
 'TOLUENE (Toluol), coml 20 cb .08 1 pal. .70 cd .25 
 
 " (Toluol), coml 5 gal. 3.00 en ..50 
 
 " (Toluol), c. p 30 cb .08 1 gal. .85 en .25 
 
 (Toluol), c. p 5 gal, 3.25 en .50 
 
 TBICHLORETHYLENE "" ' "" 
 
 TRIKRESOL 
 
 TRIPOLI, powder 
 
 TROPAEOLIN, 000. No, 1 20 incl 
 
 " 000, No, 2 20 incl 
 
 .25 
 
 cb 
 
 ,ns 
 
 .40 
 
 
 incl 
 
 .10 
 
 cc 
 
 .04 
 
 
Ounco and pound prices Price i n other ei za packar^es 
 
 Mailer or Brand per ai. conl. per ib. cont, siiS pdg. per pkj. conl, 
 
 TUMERIC, powder 25 cc .04 
 
 " paper (See Test Paper) 
 
 TUNGSTEN, metal(Wolfrain)c. p., powd 75 cb AYi 
 
 " Oxide (See Acid Tungstic) . 
 
 "TURPENTINE, ozonized 30 cb .OS 
 
 rectified 40 cb .09 
 
 " " Venice 40 cb .07 
 
 white 15 cb .08 1 gal. .85 en .25 
 
 URANIUM Acetate, c. p 60 incl 
 
 UR.\NIUM Acetate, free from Sodium Merely Blue Label .80 incl K lb- 2.50 incl 
 
 Sulphates leas than 0.0035% as SOa i 
 
 Sodium not more than 0.046% as Naf ^ „,„„j 
 
 Earths less t^n 0.005% as Ca ^ Ana"a"s 
 
 Uranous salts ...not more than 0.2385% U^^l 
 
 Foreign metals none ' 
 
 "URANIUM Nitrate, c, p .45 incl 
 
 'URANIUM Nitrate Merck Biue Label .65 incl H lb. 2.00 incl 
 
 Sulphates less than 0.0025% as SOa 1 
 
 Alkali salts less than 0.05%/ fiu„rflnlpcd 
 
 Earths lesB than 0.005% V Analyski 
 
 Uranoua salts not over 0.2385% U" { 
 
 Foreign metals none ' 
 
 UREA,,'.p 25 incl 
 
 VANADIUM Chloride c. p 1.31) incl 
 
 VANILLIN 45 incl 
 
 VASELINE (See Petrolatum) 
 
 VERMILION. English 10 cb .03I.I0cb .OS 
 
 VOLUMETRIC SOLUTIONS (See Solu- 
 
 lions) 
 
 WATER, Distilled, in 5 gal. crated bottle 75 cb 1.00 
 
 WATER, glass, (See Sodium Silicate) 
 
 WAX, (Beeswax) white 55 incl 
 
 " (Beeswax) yellow -JO incl 
 
 " Carnauba 85 mcl 
 
 " Japan 25 mcl 
 
 " for plastic reconstruction, special 
 
 inicts on application 
 
 "XYLENE (Xvlnl) 30cb .08 1 gai. 2.00 en .25 
 
 ,\" [„[) 2 gal. 3.75 en .35 
 
 ,^:^,|,jl, 5 gal. 8.00 en .50 
 
 (\y\„\]'.'.'.'.'.. '.'.'..'.'.'.'.'.'-. '.'.'.'..... Merck" -30 cb .10 
 
 "XYLENE 'Xylol), c p Baker Analyzed 1.00 eb .08 
 
 S|. Vr 0.85 ( Typical 
 
 B. p. m-UO°C) Analysis 
 
 XYLIDINE Merck Blue Label 2.00 inel }i lb. .65 inrl 
 
 "SuiDStanees insoluble in Hydro- | Guaranteed 
 
 chloric Acid none I Analysis 
 
 XYLOSE ^\ S^""- 
 
 lOgrm, 7.00 
 10 lb. 1.50 
 
 "YTTRIUM Nitrate, c. p '^-O" 
 
 ZINC, metal, eoml., granulated (mossy 
 
 zinc), for making Hydrogen. . 
 
 ZINC, metal, c. p., mossy, stick or shot. . Baker Analyzed 30 mcl '4 i« 
 
 Fe . 0.021%i 
 
 4 trace! Typical 
 
 Ph ■ 0.050% ( Analysis 
 
 Cd.'.'.'.'.'.'.['.'-'.'.'.'.'.'.'.'''''. 0.001%,? 
 
 ZINC, metal (Arsenic free), granulated, 
 
 thick sticks, thin sticks Merck Blue Label 
 
 Arsenic less than 0.000025% 
 
 ZINC, metal, c. p., mossy, free from Car- 
 bon and Arsenic, containing traces 
 
 ZINC, metal, c'. p.,' powdered, 20 mesh. . . . Baker Analyzed 
 
 metal, c. p., powdered, 30 mesh. . . . Baker Analyzed 
 
 Fe . ... 0.021%'j _ 
 
 1^' travel Typical 
 
 Vh ■ ' ■ 0.050% ( Analysis , 
 
 cd:::.:::::.:::::::.::':::: o.ooi%> 
 
 ZINC, metal, (Arsenic free) coarse powder. Merck Blue Label -80 
 
 Arsenic less than 0.000025% 
 
 ZINC, metal, c, p., special, mossy, stick 
 
 or shot „■„■„, Baker Analyzed 
 
 .30 
 .45 
 .30 
 
 incl 
 incl 
 incl 
 
 ■ 'ii ib. 
 Mlb. 
 
 .80 
 
 incl 
 
 ,'4 lb. 
 
 .35 
 
 incl 
 
 « lb. 
 
 . 0.001%-j 
 
 _.. Typical 
 .005% ( Analysis 
 
ZINC, metal, free from Arsenic, nearly 
 free from Iron, granulated, thick 
 
 sticks, thin sticks or plates Merck Blue Label 
 
 Araenic leas than 0.000025% 1 c t j 
 
 Matter oxidiaable by \ ?"","?« 
 
 Permanganate leas than 0.028% as Fe ) '^""'ys's 
 
 ZINC, naetal, c. p., powdered, 20 mesh, . . Baker Special 
 " metal, c. p., powdered, 30 mesh... Baker Special 
 
 Fe 0.00]%-i 
 
 As none ( Typical 
 
 Pb 0.005% ( Analysis 
 
 Cd Qone' 
 
 ZINC, metal, free from Arsenic, Sulphur, 
 Phosphorus and Iron, granulated, 
 thick sticks or thin sticks Merck Blue Label 
 
 Arsonie less than 0.000025% \ 
 
 Hatter oxidizable by ( Guarjnleed 
 
 Potassium Permanganate, .less tliati 0.0056% Fe(' Analysis 
 Compounds of Sulphur, Phospliorua, etc none' 
 
 "ZINC, metal, dust 
 
 °ZINC, metal, c. p., dust Baker Analyzed 
 
 Zn 82.3%'i 
 
 0.010% ( Typical 
 
 Pb , 
 
 Cd 0.050%; 
 
 , metal, dust Merck Blue Label 
 
 Tested for value of Zinc Dust 1 Guaranleed 
 
 Nitrogen not more than 0.00112%! Analysis 
 
 ZINC, metal, filings, free from Arsenic. 
 
 Arsenic less than 0.000025% 
 
 ZINC, metal, filings, free from Arsenic, 
 nearly Iron free 
 
 Araenic less than 0,000025%) 
 
 Matter oxidizable by [ 
 
 Permanganate less than 0,028% as Fe) 
 
 ZINC, 'iheet (4x^2 inches), for standard- 
 izing 
 
 As 
 
 Pb 
 Fe 
 Cd 
 
 Merck Blue Label 
 
 Merck Blue Label 
 
 Baker \nalyzed 
 
 101% I Typical 
 016 "o ( Analyait 
 
 ZINC, 
 ZINC 
 
 metil, amalgamated 
 metil plitmized 
 Acetate, pure 
 Acetate, c p 
 
 Baker \niiyze(i 
 
 .80 incl 
 
 .50 incl 
 .45 incl 
 
 1.00 incl 
 
 .17 cc .02 
 .20 cb ,06 
 
 .60 incl 
 1.00 incl 
 1.10 incl 
 
 .50 incl 
 .75 incl 
 .30 cb .09 
 .40 cb .09 
 
 'rici: in uVnvi size packages 
 ize pkg, per pkg. cont. 
 
 \i lb. ..^0 incl 
 
 34 lb. .15 incl 
 Yi lb. .15 incl 
 
 K lb. .35 incl 
 
 H lb. .25 incl 
 34 lb. .35 incl 
 yi lb. .35 incl 
 
 \i lb. .15 
 
 incl 
 
 }4 lb. .25 incl 
 M lb. .25 incl 
 
 34 lb. .15 incl 
 
 ZINC 
 
 ZINC 
 ZINC 
 
 Arsenite, c p (ortho) 
 Borate c p 
 Bromide, ( p 
 Carbonate, c p 
 Chloride, fused, pure 
 Chloride, ( p , granular 
 Chloride, c p , sticks 
 
 "0,062% 1 
 -0.001% f 
 
 trace / 
 
 . 0-005% I 
 
 k'alVSaltei 
 000 %) 
 
 oori%( 
 
 -0 001%! 
 
 00 %J 
 050%' 
 trace / 
 0000% 
 loO'" ' 
 
 Bakei -Inaljzed 
 
 Baker \nalyzed 
 Baker Analyzed 
 
 ZINC 
 
 Pb 
 
 Cd 
 
 SO, 
 
 Mn 
 
 Chloride, powder 
 
 Excess of Zinc Oxvchloride less than 5 
 
 Sulphates less than 0.002 
 
 Foreign metals 
 
 Typical 
 Analysis 
 
 Merck Blue Label 
 
 Guaranleed 
 Analysis 
 
 ZINC 
 ZINC 
 
 Iodide-Starch, solution 
 
 Tested for Sensitiven 
 
 Nitrate c p 
 
 lib 
 Cl 
 
 so» 
 
 Nitrate, c p sticl s 
 
 Oxide white 
 
 Oxide c p drj proce=f'=' 
 
 Ff 
 
 Ph 
 CI 
 CI 
 so, 
 
 Merck Blue Label 
 Baker Analyzed 
 
 Typical 
 Analysis 
 
 
 
 ZINC 
 
 Baker Analyzed 
 
 1 
 
 Typical 
 Analysis 
 
 1 
 
 1.75 cb 
 1.40 cb 
 
 .07 
 .08 
 
 '.09 
 .14 
 
 .07 
 .08 
 
 Jilb. 
 Klb. 
 
 "'ii'xh. 
 
 .60 
 .50 
 
 iacl 
 incl 
 
 .50 cb 
 
 .25 gb 
 .35 cb 
 
 .20 
 
 incl 
 
 
 
 .50 cb 
 
 
 
 1 lb. .25 incl 
 
 .65 incl 
 
 Mlb. 
 
 .20 
 
 incl 
 
 .45 cb .08 
 
 Mlb. 
 
 .15 
 
 incl 
 
 .60 cb .08 
 .14 cb .09 
 
 Mlb. 
 
 ■'Mib. 
 
 .30 
 
 incl 
 
 .35 cb .09 
 
 .15 
 
 incl 
 
ZINC Oxide, 
 
 CI 
 
 Baker Special 
 
 bU. 
 
 005?: 
 
 JMerck Blue Label 
 
 : Oxide 
 
 Araemc leas thaa 0015^ , 
 
 Sulphates lt.sa tlmn 007=1% as SO, i 
 
 Ghlondee hsa thin 001% as ClJ 
 
 Carbocatea lesa than 1% as CO I 
 
 Nitrates lesa Ihin 0010% as NtOs' ^ . . 
 
 Calcium less than 02% "^ Guaranteed 
 
 Magnesium less than 005%/ A'^""'^'^ 
 
 Foreign Heavy Metals Nonol 
 
 ForeiRn bodies w hieh reduce Pennanga I 
 nate when Zinc Oxide is disaohed in / 
 dilute bulphuno Acid none 
 ' Peroxide, c p 30 incl 
 
 Phosphate, c p Baker Analyzed 80 cb 
 
 Sulphate, pure crystals 12 cb 
 
 Sulphate, c p , crj stals Baker Analyzed 25 cb 
 
 I e 00! , 
 
 Pb 001% ( Typical 
 
 Cd trace/ Analysis 
 
 CI 002% f 
 
 : Sulphate Merck Blue Label 
 
 Chlorides 
 Foreign metala 
 Iron 
 Nitrate 
 ^.tnmonium 
 
 compounds 
 Tree Sulphu 
 
 ■Vrspr 
 
 
 leal than 001% 
 
 n 0035% as NHil 
 
 leM thin 0005% 
 
 lUh. 
 
 Klb. 
 M lb'. 
 
 Sulphate 
 
 
 Sulphate 
 
 
 Free Sulphuric Aci 
 
 i 
 
 
 
 
 
 
 
 Foreign metala 
 
 
 Chlorina 
 
 
 Nitrate 
 
 
 Sulphate, c p , 
 
 anhydrous 
 
 Sulphide, ( p 
 
 
 Kahlbaum "C.F.A." 100 grm. 
 
 Kahlbaum "C.f.A." 500 Rrm, 
 
 ■{ 111 10 ' Certified 
 
 \i grams/ Analysis 
 
 50i;b .08 Mlb. 
 
 Baker Analyzed l.r.O cb .08 K lb- 
 
 003% 1 
 
 trace ( Typicai 
 II On^"" r Analysis 
 IIOiO^ ' 
 
 per pl<g. cont, 
 
 .20 incl 
 
 .30 incl 
 !l5 ' incl 
 
 .-"0 incl 
 .75 incl 
 
 .20 incl 
 M incl 
 
SECTION II 
 
 STAINS AND CHEMICAL PREPARATIONS FOR USE IN MICROSCOPY, 
 
 BACTERIOLOGY, ETC. 
 
 Nutrient Media for Bacteriological Cultures 
 
 AGAR AGAR, in shreds, prime, white A. H. T. Co. No. 40 
 
 '■ " powder Witte 
 
 BEEF EXTRACT, in jars Liebig 
 
 " " Liebig 
 
 GELATINE, Gold Label A. H. T. Co. No. 33 
 
 " Extra (French) Coignet 
 
 LITMUS MILK (Lakmusmolke kiinstlich 
 
 nach Seitz) Kahlbaum 
 
 " " (Lakmusmolke kiinstlith 
 
 nach Seitz) Kahlbaum 
 
 NUTRIENT MEDIA, after Von Heyden 
 (Nahrstoff Heyden), in 
 
 original tins 
 
 NUTROSE (Casein-Sodium), in original 
 
 packages 
 
 PEPTONE. Witte 
 
 " in original tins of 10 kiloa Witte 
 
 Imbedding Media for Section Cutting 
 
 CELLOIDIN, shreds Schering 
 
 PARAFFINE, domestic, melting point about 
 
 43° C 
 
 domestic, melting point about 
 
 52° C 
 
 " best white, imported, melt- 
 ing point 35-37° C 
 
 " best white, imported, melt- 
 ing point 40-45 "C 
 
 " best white imported, melt- 
 ing point 45-50° C 
 
 " best white, imported, melt- 
 ing point 50-55° C 
 
 " best white, imported, melt- 
 ing point 60-62° C 
 
 " best white, imported, melt- 
 ing point 74-76° C 
 
 " white, filtered, imported, 
 
 melting point 36° C Gruebler 
 
 " white, filtered, imported, 
 
 melting point 40-42° C Gruebler 
 
 " white, filtered, imported, 
 
 melting point 44-46° C Gruebler 
 
 " white, filtered, imported, 
 
 melting point 50-52° C Gruebler 
 
 " white, filtered , imported , 
 
 melting point 56-58° C Gruebler 
 
 " white, filtered, imported, 
 
 melting point 60-62° C Gruebler 
 
 PITH, for sectioning 
 
 85 incl 
 
 .25 cb .03 2.00 cb 
 
 2.75 
 
 .60 
 1.00 
 
 incl 
 incl 
 
 .25 
 
 incl 
 
 .25 
 
 incl 
 
 .30 
 
 incl 
 
 .30 
 
 incl 
 
 M lb. 
 Mlb. 
 
 .90 
 1.50 
 
 .30 cb ,03 3.25 cb .09 
 
 100 grm. 
 500 grm. 
 
 U lb. 
 H lb. 
 
 1.50 
 1.00 
 
 incl 
 incl 
 
 ^2 kilo 
 
 1.15 
 
 incl 
 
 H kilo 
 
 .45 
 
 incl 
 
 ,'2 kilo 
 
 .50 
 
 incl 
 
 Jo kilo 
 
 ..50 
 
 incl 
 
 .■2 kilo 
 
 .60 
 
 incl 
 
 }.i kilo 
 
 pke- 
 
 .65 
 .10 
 
 mcl 
 incl 
 
 Media for Mounting Microscopic Objects and for Finisiiing Mounts 
 
 ASPHALTUM 
 
 BALSAM. Canada, dry 
 
 " Canada, natural, paper filtered 
 
 " Canada, dissolved in Benzol 
 
 " Canada, dissolved in Chloroform 
 
 " Canada, dissolved in Xylol 
 
 " Damar. in Benzol 
 
 BELL'S MICROSCOPIC C:EMENT 
 
 BROWN'S TRANSPARENT RUBBER CEMENT . 
 
 BRUNSWICK BLACK 
 
 DEANE'S MEDIUM. , 
 
 FABRANT'S MEDIUM 
 
 .25 
 .30 
 
 .30 
 .45 
 .45 
 
 6 
 6 
 6 
 6 
 
 00 
 00 
 00 
 00 
 00 
 00 
 
 
 
 
 
 incl 
 incl 
 inc! 
 incl 
 incl 
 incl 
 incl 
 incl 
 incl 
 ind 
 
GLYCERINE, camphorated 
 
 jelly 
 
 GOLD SIZE 
 
 MOLLIS' GLUE 
 
 MARINE GLUE, colorless.... 
 
 " fluid 
 
 " " hard 
 
 MEYER'S ALBUMEN FIXATIVE 
 WHITE ZINC CEMENT 
 
 .25 
 
 nel 
 
 .30 
 
 nel 
 
 1.5 .75 
 
 nei 
 
 .35 
 
 nr.l 
 
 50 
 
 ncl 
 
 30 
 
 nnl 
 
 35 
 
 nel 
 
 25 
 
 ncl 
 
 50 
 
 iicl 
 
 Media for Mounting Microscopic Objects and for Finishing Mounts 
 
 From the Laboratory of Dr. G. Gruebler & Co., Leipzig, Germany. Furnished in original packages only. 
 
 3 
 
 BALSAM. Canada. rcftifieJ, neutral 
 
 MASKENLACK. No. Ill 
 
 MONOBROMNAPHTHALIN 
 
 STYRAXLOSUNG FUR DIATOMEEN 
 
 Microscopic Stains, Dry 
 
 From the Laboratory of Dr. G. Gruebler & Co., Leipzig, Germany. Furnished in original packages only. 
 Where stains are sold in the original Gruebler packages, we have used the German name in the price list, as 
 experience shows users of these goods to be quite as familiar with the German, as with the English equivalent. 
 
 100 gram 
 
 
 1.50 
 
 .60 
 
 2.50 
 
 incl 
 incl 
 incl 
 
 I. .50 
 
 incl 
 
 A.— METHYLENBLAU-EOSIN (Eeuter) 38 
 
 ACETINBLAU .25 
 
 ACID CARMINIC, la 20 1.88 
 
 ILa 15 1.25 
 
 .\CRIDINORANGE .35 
 
 ACRIDINROT 30 
 
 AETHYLVIOLETT 35 
 
 AL.^UN-CARMINsicc (Grenacher's solution of Alum- 
 
 ca'mine ia obtained by dissolving 
 
 this dry stain in from 20 to 25 parts 
 
 of boiling water) .83 
 
 ALIZARIN KRIST, Spalteholz 33 3.00 
 
 ALIZARINBLAU S Ehrlich .30 
 
 ALIZARIN I SICC Rawitz .40 
 
 ALIZARIN SULFACIDE, Metschnikoff 35 
 
 ALIZARIN SICC .40 
 
 ALIZARINCYANIN, Rawitz 33 
 
 ALIZARINCYANIN. Spalteholz 33 3.00 
 
 ALIZARINGBUN B 30 
 
 ALIZARINSULFOSAURES NATRON 33 
 
 ALKAI.IBLAU 33 
 
 ALKALIGRiJN 38 
 
 ALKANIN, fettlosi. Rot 30 
 
 AMMONIAK-CAEMIN Hoyer .23 2.00 
 
 ANILIN (-SALZE) CHLORHYDRAT 10 
 
 SCHWEFELSAURES 13 
 
 ANILINBLAU soluble in alcohol 35 
 
 " soluble in water .33 
 
 ANILIN-BLUE-BLACK 35 
 
 ANIUNGELB 25 
 
 ANILINGRUN Strasburger 30 
 
 ANTHRACENBLAU, Kaplan 30 
 
 AURAMIN 30 
 
 AURANTIA 45 
 
 AZOBLAU 30 
 
 AZOCARMIN 25 
 
 AZUR I Giemsa 2.50 
 
 " II Giemsa 1.25 
 
 " II, Eosin Giemsa 1.88 
 
 BENZOAZURIN 33 
 
 BENZOPURPURIN Bipch-Hirschfcld 30 
 
 BERLINERBLAU {Sec Colors for Injecting) 
 
 BIEBRICHER SCHARLACH C.nesbach 30 
 
 BIONDI-EHRLICH-HEIDENHAIN three color mix- 
 ture, drv "'"iruebler" 1.45 
 
 BISMARCKBRAUN Weigert 20 
 
 BITTERMANDELOLGBUN 30 
 
 65 
 
 25 Grams 100 Grams 
 
BLACKLEY-BLAU (See Anilin-blue-black) 
 
 BLAUHOLZEXTRACT (See Campecheholzextract). . . 
 
 BLAUSCHB'AEZ 33 
 
 BLEU DE LYON Griesbach 30 
 
 BORAXCAKMIN SICC 90 
 
 BORDEAUX E Griesbach 30 
 
 BRASILIN 25 
 
 BRILLIANTBLAU, EXTRA GRtJNLICH 40 
 
 BRILLANT-CRESYLBLAU 35 
 
 BRILLANTGRUN 30 
 
 BRILLANTSCHWARZ 35 
 
 CAMPECHEHOLZEXTRACT Paneth 10 
 
 CAEMALAUN SICC. "Gruebler" (P. Mayer's alum 
 carmine solution is obtained by 
 dissolving this dry stain in hot 
 
 water) -60 
 
 CARMIN RUBE. OPT 43 
 
 C.4RMIN II 38 
 
 CARMINS. AMMONIAK (Sec Ammoniak-Carmin) . . . 
 
 CARMINSAURE (See Acid Carminic) 
 
 CARIUINS. NATRON (See Natron Carmin) 
 
 CHINABLAU .35 
 
 CHINAGRtJN (for typhoid cultures) 25 
 
 CHINOLTNBLAU (See Oyanin) 
 
 CHLORHYDRINBLAU Kuhne .25 
 
 CHROMOGEN, lor neuroglia staining Weigert 20 
 
 CHROMOTROP 25 
 
 CHRYSAMIN 25 
 
 CHKYSOIDIN 25 
 
 COCCININ 30 
 
 COCCIONELLA lA, pulv 15 
 
 COERULEIN S 30 
 
 CONGOCOEINTH G 30 
 
 CONGOROT, Nissl 33 .75 
 
 CORALLIN, soluble in alcohol and caustic solution. . Strausburger 25 
 
 " soluble in water .25 
 
 CRESYLECHTVIOLETT 30 
 
 CRISTALLVIOLETT 30 
 
 (Hochst) 30 
 
 CEOCEIN Griesbach 30 
 
 CROCEINSCHARLACH 7 B 30 
 
 CURCUMEIN N 20 
 
 CYANIN 75 7.00 
 
 DAHLIA 30 
 
 DIAMANTFUCHSIN 33 
 
 ECHTGRON (DINITEO.SOEESORCIN), Plainer 28 
 
 ECHTEOT 50 
 
 EOSIN A. G 35 
 
 EOSIN B. A 30 
 
 " soluble in water, yellowish .30 .65 
 
 " soluble in water, bluish .25 
 
 " soluble in alcoho' .30 
 
 " pure, French, for blood staining .30 
 
 EOSIN-IVIETHYLENBLAU 18 1,65 
 
 " " Jeoner May-Griinwald .25 2.25 
 
 " " Lcishman 38 3.50 
 
 Renter 38 
 
 EEYTHEOSIN. PUR 45 
 
 FLUORESCEJN, Czaplewsky Kuhne 45 
 
 FLUOEESCElN-KALIUM 35 
 
 FUCHSIN, for bacilli staining 25 .56 
 
 FUCHSIN S. (Acid Fuchsin) Weigert 30 .63 
 
 FUCHSIN-IUETHYLENBLAU 68 
 
 GALLEiN EN PATE 10 
 
 SICC 50 
 
 GALLOCYANIN 25 
 
 GENTIANA-VIOLETT, Cram u.A 25 .60 
 
 GOLDORANGE Griesbach 20 
 
 HAEMALAUN, SICC. "Gruebler" (P, Mayer's Hac- 
 malum solution is obtained by 
 dissolving this dry stain in hot 
 water) .60 
 
HAEMATElN, PURISS. 
 
 HAEMATElN-AMMON. PURISS 
 
 HAEMATOXYLIN, PURISS., KRISTALL 
 
 (DUNKED 
 
 HAEMATOXYLIN-EOSIN . . . 
 
 HELIANTHIN 
 
 HESS. BORDEAUX 
 
 HEXAMETHYLVIOLETT (See Methylviolett 6 B). .' .' 
 HOFMANNS-VIOLETT. 
 
 JANUSGRON 
 
 JENNER'S STAIN 
 
 INDIG-CARMIN (Indigo-Sulphonate of Soda) 
 
 INDIG-CARMIN (Indigo-Sulphonate of Soda) la opt. 
 
 for Heidenhain's kidney injection. 
 
 See Colors for IniectinE) 
 
 INDULIN 
 
 JODEOSIN SICC 
 
 JODGRUN. Griesbach u.A. (Ersatz) 
 
 KRESOFUCHSIN. , . . 
 
 LACMUS STAIN, Neutral 
 
 LEISHMAN STAIN 
 
 LEUKOANILIN (Leuko-Fuchsin) 
 
 LEUKOBLAU 
 
 LEUKOBRILLIANTGRiJN 
 
 LEUKO.MALACHITGRtJN 
 
 LICHTGRiJN F. S., Benda u.A. . . 
 
 MAGDALAROT, echt 
 
 " des Handels 
 
 MAGENTAEOT 
 
 MALACHITGRUN 
 
 la 
 
 KRIST (Double salt of Zinc 
 
 Chloride) 
 
 MARTIUSGELE 
 
 MAUVEIN 
 
 MAY-GEtJNWALD'S STAIN 
 
 METANILGELB, Kristall. la 
 
 METHYLELAU 
 
 METHYL-EOSIN 
 
 METHYLGRUN 
 
 KRIST. OO. yellowish 
 
 METHYLORANGE 
 
 METHYLVIOLETT B.N 
 
 5 B 
 
 IB 
 
 6 B '(Hex'amelhyi-vioiett).'.'. '.'.'.'. 
 METHYLENBLAU, tor bacilli staining 
 
 •' (See Colors for Injecting) 
 
 B. X 
 
 " medic, pur 
 
 rein L. F 
 
 METHYLENBLAU-EOSIN, Jenner 
 
 METHYLENBLAU 
 
 METHYLENGRON 
 
 METHYLENVIOLETT 
 
 MUCICAEMIN, SICC 
 
 MUCH.4MATEIN 
 
 MUSCARIN 
 
 NACHTBLAU 
 
 NAPHTALINROT, PUR 
 
 NAPHTOLGELB S 
 
 NAPHTOLGRtjN B. 
 
 NAPHTYLAMINBRAUN 
 
 NAPHTYLAMINGELB (Naphtolgelb) 
 
 NAPHTYLENBLAU R. in Kristall 
 
 NATRON-CARMIN 
 
 NEUTRALROT, rein, nach P. Ehrlich, f. Inj. in vital 
 
 Gew. zu Graunlargb.-Farbg 
 
 NIGROSIN 
 
 NIBLAU-CHLORHYDRAT 
 
 NIBLAU-SULFAT 
 
 P. Mayer 
 P. Mayer 
 
 .33 
 .35 
 .33 
 
 Czaplewsky 
 
 1.10 
 .38 
 
 Koch 
 Ehrlich 
 
 Siegmund Mayer 
 Guttmann & 
 Ehrlich 
 
 May-Griinwald 
 Leishman 
 
 P. Mayer 
 P. Mayer 
 
 .38 
 '.28' 
 
 3.30 
 3.00 
 .6.5 
 
 .20 
 .35 
 
 .30 
 2.25 
 .45 
 
 1.25 
 1.25 
 1.25 
 .25 
 
 .35 
 .30 
 
 .50 
 
 .25 
 
 .30 
 
 .38 
 
 .35 
 .30 
 
 .50 
 
 .35 
 
 2.25 
 
 3.50 
 
 .38 
 
 ..50 
 .35 
 
 ".25 
 .25 
 .25 
 
 .25 
 .45 
 
 6.00 
 5.00 
 
 4.75 
 3.25 
 
ORANGE G 
 
 ORCEIN, PUR., Israel, Unna U.A 
 
 ORCEIN, spec. f. Elastin-farbung, Unna.. 
 
 OXYOBCEIN 
 
 ORSEILLE, Extract 
 
 PATENT-SAURE-EUBIN 
 
 PHENOSAFRANIN (See Safranin, pure).. 
 
 PHLOXINROT 
 
 PIKROCAEMIN, SICC 
 
 PIKROLITHIONCARMIN, SICC, "Gruebler" (Solu- 
 tion made by dissolving in boiling distilled 
 water, allowing to stand and then filtering) .... 
 
 PONCEAU P. R 
 
 PURPUEIN, SICC. OPT 
 
 PYRONIN 
 
 RESORCIN-FUCHSIN 
 
 ROMANOWSKY STAIN 
 
 ROSANILIN (-Base) 
 
 ROSANILINCHLORHYDRAT 
 
 ROSANILIN, .saltpctersaures 
 
 " schwefelsaures 
 
 ROSANILINVIOLETT, Ilanstein 
 
 ROSAZURIN B 
 
 G 
 
 ROSE BENGALE 
 
 ROSOLSAURE 
 
 ROTVIOLETT, 5R. S 
 
 RUBIN S 
 
 RUTHENIUMROT (MANGIN), per 1-lOth gram 
 
 SAFRANIN O., soluble in water, Pfitzner, Flemming. 
 
 SAFRANIN, pure (Phonosafranin) 
 
 " soluble in alcohol 
 
 SAUREALIZARINELAU 
 
 SAUREALIZARINGRtJN 
 
 SXUREFUCHSIN (Seo Fuchsin S.) 
 
 SXUREGEllN 
 
 SXUREVIOLETT, 1897, Ers. f, Hoflmansblau 
 
 " Kiiline 
 
 SAUREBRAUN 
 
 SCHARLACH R., Michaelis 
 
 SILBERNITRAT-AMMONIAK 
 
 SMARAGDGEi'N 
 
 SOLIDGRON 
 
 SPILLER'S PURPLE 
 
 SUDAN III, for fat staining after Daddi 
 
 THIAZINBRAUN 
 
 THIAZINROT 
 
 THIONIN PUR, Ehrl., Hoycr, Heidenhain 
 
 TOLUIDINBLAU, Hoycr 
 
 TROPAOMN 00 and 000 
 
 TRYPANROT . . 
 
 URANIN 
 
 VESUVINBRAUN 
 
 VK'TORIABLAU 4 E., Lustgarten 
 
 VIOLETTSCHWARZ 
 
 VITALNEUROT (Dr. Schulemann) 
 
 WASSERBLAU, Unna U.A 
 
 WOLLSCHWAEZ. Loffler. f. Bact.-Geisseln 
 
 WEIGHT'S STAIN 
 
 Kultschitzky 
 
 Birch-Hirschfeld 
 
 Cuccati 
 
 Hoyer 
 
 P. Mayer 
 
 Ranvier 
 
 .18 
 .18 
 
 .25 
 
 .25 
 .25 
 
 Pappenheim 
 
 Griesbach 
 Unna 
 
 Fajerzstajn 
 
 .43 
 .65 
 
 .15 
 .30 
 
 4.25 
 
 .38 
 
 2.25 
 
 3.50 
 
 .50 
 .50 
 
 .40 
 .25 
 
 .38 
 .40 
 
 .25 
 1.50 
 .35 
 .25 
 .50 
 .35 
 .25 
 .38 
 .30 
 
 Colors for Injecting 
 
 From the Laboratory of G. Gruebler & Co., Leipzig, Ciermany. 
 
 BEEI.INERBLAU, insoluble in water 
 
 BERLINERBLAU la, easily soluble in water 
 
 CARMIN COERULEUM, for Cystoskopy, 1 tube of 20 
 
 tablets, per tube 
 
 INDIGCARMIN OPT. la pure (Indigosulphonate of 
 Soda), for kidney injection. 
 
 Furnished in original packages only 
 t Gram 10 Grairs 100 Grams 1000 Grams 
 
 1.00 8.00 
 
 .30 2.65 
 
 .80 
 
 incl 
 inc! 
 
 incl 
 incl 
 
Ehrlu 
 
 Spalteholz 
 
 INJECTIONS— ROT. for injection in vital organs. 
 LEIM-INJECTIONSMASSEN— (Gelatine injection 
 
 mass) blue 
 
 " " (Gelatine injection 
 
 mass) red 
 
 " " (Gelatine injection 
 
 mass) yellow Ackermai 
 
 " " (Gelatine injection 
 
 mass) black 
 
 " (Gelatine injection 
 
 mass) red, cone, fast 
 
 "Gruebler" 
 
 METHYLENBLAU RECTIF., for injection in vital 
 
 organs Ehrlich 
 
 4.50 
 4.75 
 
 Staining Solutions 
 
 From the Laboratory of Dr. G. Gruebler & Co., Leipzig, Germany. Furnished in original packages only. 
 
 10 Grams 25 Grama 100 Grams Conl. 
 
 EHRLICH'S TRIPLE MIXTURE 30 1.10 incl 
 
 GIEMSA'S SOLUTION, for the Romanowsky method 40 1.50 incl 
 
 METHYLENE BLUE POLYCHROMATIC, nach Unna .25 .60 incl 
 
 PICROCARMINE, after Weigert 15 .50 incl 
 
 Dry Stains in Tablets, "Soloid" Brand 
 
 The tendencj' of solutions of the aniline dyes to decompose has always been a source of trouble in micro- 
 scopic work. The "Soloid" Microscopic Stains contain aniline dyes of the highest quality, and make it 
 possible to prepare solutions in small quantities as required. By their use waste is avoided, and correct results 
 are assured. These are supplied in tubes containing six tablets each, Instructions for making solutions are 
 furnished with each tube. 
 
 In Loeffler's alkaline methylene blue, aniline gentian violet and Ziehl's carbol fuchsin the solutions ob- 
 tained are only approximately equivalent to those prepared according to the original formula;. The figures 
 avoid small fractions in measurement, enabling the solution to" be prepared more readily, without diminish- 
 ing the efficiency of the stain. 
 
 BISMARCK BROWN, pure 0.1 gram. Dissolve one "Soloid" Bismarck Brown in 7 cc of abso- 
 lute alcohol and add 7 cc of distilled water 
 
 BORAX METHYLENE BLUE. Dissolve one "Soloid" Borax Methylene Blue in 10 cc of dis- 
 tilled water 
 
 EHRLICH'S TRIPLE STAIN (Biondi-Ehrlich- Heidenhain Triple_ Stain). Dissolve one 
 "Soloid" Ehrlich Triple Stain in 25 cc of distilled water, one "Soloid" Acid Fuchsin in 2 cc 
 of distilled water and mix. The mixture is ready for use and keeps well 
 
 EOSIN, pure, 0.1 gram. To obtain a solution of eosin suitable for general staining, one "Soloid" 
 product may be dissolved in 20 cc of 50% alcohol. This gives a 0.5% solution 
 
 EOSIN-AZUR (for Giemsa staining) 0.038 gram. Dissolve one "Soloid" product in 5 cc of a 
 mixture of equal parts of glycerine and pure methyl alcohol 
 
 EOSIN -METHYLENE BLUE (Louis Jenner's Stain) pure 0.05 gram. Dissolve one "Soloid" 
 product in 10 cc of pure methyl alcohol 
 
 FUCHSIN (Basic) pure, 0.1 gram. Dissolve one "Soloid" Fuchsin in 2.5 cc of absolute alcohol 
 and add 10 cc of distilled water 
 
 GENTIAN VIOLET, pure, 0.1 gram. Dissolve one "Soloid" Gentian Violet in 7 cc of absolute 
 alcohol and add 7 cc of distilled water 
 
 GRAM'S IODINE SOLUTION, 15 cc. Dissolve one "Soloid" product of reagent A in 10 cc of 
 distilled water, add one of reagent B, and when solution is complete, dilute to 15 cc with 
 distilled water 
 
 HAEMALUM — Each "soloid" product contains Haematein, .0005 grm, and Ammonia Alum, 
 0.25 grm. To prepare the stain, one product is ground up with 5 cc of distilled water, and 
 boiled a few minutes. A clear solution is thus obtained 
 
 HAEMATOXYLIN. pure, 0.1 gram. Dissolve one "Soloid" Haematoxylin in 1 cc of absolute 
 alcohol and add 2 cc of distilled water 
 
 METHYLENE BLUE, pure, 0.1 gram. Dissolve one "Soloid" Methylene Blue in 7 cc of abso- 
 lute alcohol and add 7 cc of distilled water 
 
 METHYL VIOLET, pure, 0.1 gram. Dissolve one "Soloid" product in 1 cc of absolute alcohol 
 and add 5 cc of distilled water 
 
 ROMANOWSKY STAIN (Leishman's Modification), Dissolve onr "Snl,,;,l" r dint in 10 n: 
 of pure methyl alcohol 
 
 ROMANOWSKY STAIN (Wright's Modification). Dissolve one ■■Soluid" pi-odun m lo (■■■ ,,f 
 pure methvl alcohol 
 
 THIONIN BLUE, pure, 0.1 gram. Dissolve one "Soloid" Thionin Blue in 10 cc of absolute 
 
 alcohol and add 5 cc of distilled water . 
 
 69 
 
 2.55 
 3.15 
 
 2.55 
 2.55 
 2.55 
 
 2.25 
 2.55 
 2.-55 
 2. .55 
 
 2. .55 
 2.55 
 
Grams 
 
 100 Gra 
 
 .?,!< 
 
 .45 
 
 .35 
 
 .43 
 
 .:m 
 
 .60 
 
 .?,« 
 
 .35 
 
 .?-. 
 
 .45 
 
 Ml 
 
 .lid 
 
 .211 
 
 .30 
 
 TOISON BLOOD FLUID. For the preservation of blood corpascles and the counting of the 
 same. Dissolve one "Soloid" product in 3 cc of glycerine and 16 cc of distilled water. The 
 solution should always be filtered immediately before use. It acts as a simple diluent, 
 prevents clotting and preserves the natural appearance of the red corpuscles. At the same 
 time the nuclei of the white corpuscles are faintly tinted, so as to facilitate their recognition 
 and counting; but no means is afforded for discriminating between the different varieties. . .25 2.55 
 
 METHYL ALCOHOL, pure, in hermetically sealed glass phials containing 15 cc 25 3.00 
 
 Staining Material in Solution 
 
 These solutions are made in every case in accordance with the author's latest formula, and from Gruebler's 
 dry stains. Because of the instability of many of these solutions, we cannot guarantee their performance unless 
 they are used promptly after delivery. We recommend the purchase of dry stains and the preparation of solu- 
 tions in the laboratory, as the most satisfactory and economical method. The solutions listed below are those 
 for which we have most demand and are kept in stock ready for immediate delivery. Others made promptly 
 to order. 
 
 Aijlhur 
 
 AMMONIA WATER-GENTIAN VIOLET Weigert 
 
 ANILINE WATER-GENTIAN VIOLET Gram 
 
 BIONDI-EHRLICH-HEIDENHAIN'S TRIPLE MIXTURE 
 
 BISMARCK BROWN, saturated aqueous solution 
 
 BROWN ^ _ Weigert 
 
 " BROWN, saturated alcoholic solution 
 
 BORAX- CARMINE Grenacher. . . . 
 
 " CARMINE, alcoholic Grenacher 
 
 CARBOL-FUCHSIN. {Gabbett's Solution I.) For use in staining tuber- 
 
 culi baeilU in connection with Gabbett's Methylene Blue Ziehl-Nielson, 
 
 CARBOL XYLOL, for clearing Weigert 
 
 CONGO RED 
 
 CONGO RED SOLUTION in diluted alcohol 
 
 EHRLICH, TRIACID SOLUTION, for neutrophile granules 
 
 TRIPLE MIXTURE, for eosinophilous cells 
 
 EOSIN. BLUISH 
 
 YELLOWISH, saturatef! alcoholic solution 
 
 '■ YELLOWISH, saturated aqueous solution 
 
 EOSINATE OF METHYLENE BLUE Jenner 
 
 " GABBET, Bacillus Stain, Solution II. For use in staining tuberculi bacilli 
 
 in connection with Carbol Fuchsin 
 
 GENTIAN VIOLET, saturated aqueous solution 
 
 " VIOLET, saturated alcoholic solution 
 
 VIOLET Ehrlich 
 
 GIEMSA'S STAIN. For use in staining malarial parasites. I'iqual parts of 
 
 Azure II and Eosin solution ready for use 
 
 GOLDHORN, Polychrome Methylene Blue 
 
 " "One-Solution" 
 
 HAEMATOXYLIN, concentrated Delafield 
 
 IRON, Solution No. 1 Heidenhain. . , . 
 
 " IRON, Solution No. 2 Heidenhain 
 
 HARRIS' MODIFICATION OF ROMANOWSKY'S STAIN 
 
 HASTING'S STAIN 
 
 IODINE SOLUTION Gram 
 
 JENNER'S EOSINATE OF METHYLENE BLUE 
 
 LEISCHMAN'S BLOOD STAIN 
 
 METHYLENE BLUE, for bacillus Loeffler 
 
 " BLUE, Acetic acid, for diphtheria bacillus Neisser 
 
 " BLUE, (Soapymethylene blue) Nissl 
 
 BLUE, Gabbet's 
 
 BLUE, Polychromatic Goldhorn 
 
 " BLUE, saturated alcoholic solution 
 
 " BLUE, saturated aqueous solution. 
 
 NEUSSER'S STAIN 
 
 PAPPENHEIM STAIN 
 
 TINCTURE FOR STAINING ELASTIC TISSUE Weigert 
 
 TOISSON SOLUTION 
 
 VAN GIESON SOLUTION 
 
 WRIGHT'S STAIN. cuarantfPd 
 
 ZIEHL-NIELSON CARBOL FUCHSIN 
 
 .20 
 
 .35 
 
 ..•«) 
 
 .55 
 
 .45 
 
 .80 
 
 .BO 
 
 1.10 
 
 .25 
 
 .45 
 
 .30 
 
 .60 
 
 .30 
 
 .50 
 
 .45 
 
 1.50 
 
 .«! 
 
 1.65 
 
 .35 
 
 .60 
 
 .20 
 
 .35 
 
 .30 
 
 .50 
 
 .40 
 
 
 .50 
 
 1.25 
 
 .20 
 
 .35 
 
 .40 
 
 .75 
 
 .30 
 
 .75 
 
 .25 
 
 .45 
 
 .25 
 
 .40 
 
 ..30 
 
 .50 
 
 .25 
 
 .40 
 
 .45 
 
 1.50 
 
 ..50 
 
 1.00 
 
 .40 
 
 .80 
 
 .20 
 
 .35 
 
 .20 
 
 .35 
 
 .55 
 
 1.00 
 
 .211 
 
 .35 
 
 .35 
 
 .65 
 
Reagents for Serological Work 
 
 These reagents are furnished in original packages only and are manufactured by the H. K. Mulford 
 Company. 
 
 AGGLUTINATING SERUM, Cholera 1 grm. 2.00 
 
 SERUM, Typhoid 1 grm. 2.00 
 
 SERUM, Paratyphoid, "A" 1 grm. 2.00 
 
 " SERUM, Paratyphoid, "B" 1 grm. 2.00 
 
 ANTIHUMAN HEMOLYTIC AMBOCEPTOR PAPER . 10 tests 3.00 
 
 ANTISHEEP HEMOLYTIC AMBOCEPTOR... 1 cc. 5.00 
 
 HEMOLYTIC AMBOCEPTOR PAPER 10 tests 3.00 
 
 ANTIGEN-NOGUCHI , ,, 10 tests 3.00 
 
 ANTIGEN, Cholesterin, Fortified 10 tests 2.00 
 
 BORDEN OUTFIT for Serodiagnosis of Typhoid Fever Outfit 3.50 
 
 BASS TEST for Serodiagnosis of Typhoid Fever 60-120 tests 2.50 
 
 NOGUCHI REAGENTS, Antigen and Amboceptor 10 tests 5.00 
 
 Kahlbaum Collections 
 
 Kahlbaum collection of 200 different Carbon combinations, in stoppered glass specimen vials with foot, 
 
 each containing from 15 to 150 cc. of material. Imported to order only. Price "duty free" $75.00 
 
 Kahlbaum collection of 98 substances in glass vials, arranged according to Knorr & Duden for the intro- 
 duction to the study of organic chemistry. Imported to order only. Price "duty free" 9.00 
 
 Kahlbaum collection for demonstrations in physical chemistry without loss of material, after Prof. Dr. 
 E. Bose, experiments 1 to 17, with printed directions, packing included, but without tube No. 8b 
 of Carbonic Acid. Imported to order only. 
 
 Price, "duty free" 52.75 
 
 Carbonic Acid tube, extra, "duty free" 4.80 
 
 Liquified Gases 
 
 Liquefied Gases, in glass tubes for demonstrations, Kahlbaum. Each tube furnished in a velvet lined case. 
 Imported to order only. 
 
 CulyFree 
 
 Ammontak (Ammonia) $3.20 
 
 Chlor (Chlorine) 3.20 
 
 Cyan (Cyanogen) 5.12 
 
 Kohlenoxysulfid (Carbon Oxysulphide) 5.12 
 
 Kohlensaure (Carbon Dioxide) ... 4.80 
 
 Methylather (Methyl Ether) 3.84 
 
 Methylchlorid (Methyl Chloride) 2.88 
 
 Nitrosylchlorid (Nitrosyl Chloride) 4.48 
 
 Phosgen (Phosgene) 2.56 
 
 Salzasure (Hydrochloric Acid) 3.84 
 
 Schwelflige Siiure (Sulphur Dioxide) ._ 2,56 
 
 Schwefelwasserstoff (Hydrogen sulphide) 5.12 
 
 Stickoxydul (Nitrous Oxide) 5.12 
 
 Stickstofftetroxyd (Nitrogen Peroxide) 4.48 
 
a,„- 
 
^Hf 
 
 wmm