Presfented to by lausch & Lomb Optical Co. For Personal Use. JVo 8327 THI JOHN • CRAIG LIBRARY COLLEGE OF AGRICULTURE O -.OC DOc""^" ''"'""*''''•'''"'■' *mSm»,«™.* ^"^ supplies for chemical and 3 1924 002 937 385 Cornell University Library The original of tiiis book is in tine Cornell University Library. There are no known copyright restrictions in the United States on the use of the text. http://www.archive.org/details/cu31924002937385 APPARATUS AND SUPPLIES FOR Chemical and Biological Laboratories 1904 BAUSCH & LOMB OPTICAL CO. Rochester, N. Y., U. S. A. New York, Boston, Chicago, U. S. A. Frankfurt-on-Main, Germany CATALOG F Copyrighted 1904 Bausch & Lonib Optical Co. All rights reserved INFORMATION FOR THE PURCHASER N PRESENTING this, our second catalogue of appa- ratus and supplies for chemical and biological lab- oratories, we are pleased to be able to announce a great advance in the completion of our facilities for the manufacture and sale of apparatus. Desiring to place ourselves in the best possible position to serve our patrons with the highest type of apparatus of uniform quality, and at as low cost as is consistent with it, a glass factory has been erected in the Thuerin- gen Forest, Germany, the center of the European chemical glass in- dustry, which is operated under the direction of the Bausch & Lomb Optical Company, G.m.b.H., Frankfurt a/M., Germany. a company organized to market the products of the Bausch & Lomb Optical Company, Rochester, N. Y., in Europe, and to act as distributors for the product of their factory and for other goods made by other European manufacturers to this and other foreign markets. The factory, which has been built after American plans and em- ploying American methods, makes that class of chemical glassware which is "blown before the lamp," but it contracts for all other glass- ware, giving close, personal attention to every detail of manufacture to insure correct form and qualit}-. The factory is under the manage- ment of one thoroughly familiar with the manufacture of chemical glassware, and the workmen employed are the very best that it is pos- sible to procure. Owing to the composition of the materials used, the resulting arti- cles possess an unusual degree of resistence to the action of reagents. We have submitted specimens to the Imperial Commission and to lead- ing chemists of the United States, and have these reports on file, which show that the glass is adapted for the very best laboratory work, and we shall be pleased to send copies of these reports to those interested. To distinguish this glass from other glassware on the market, we will stamp Beakers, Flasks and Evaporating Dishes, in the glass, and Test Tubes on the cases in which they are packed , with the trademark BALOC, a word composed of the initials of our Company. The graduated ware receives our most careful attention. Not alone has delicate graduating apparatus been employed to insure great accu- racy, but special machinery has been developed to engrave the figures neatly and to make them easily legible. Specimens of these products, also, have been submitted to the Imperial Commission and we have on file reports, of which copies will be sent on request, showing but slight errors in this ware. For general use, where extreme accuracy is not essential, we recommend our burettes, pipettes, cylinders, etc., with "half way around" graduations. These we consider a great improvement over the short line graduations, as they facilitate quick and accurate reading. For the most accurate use we offer our special line of graduated ware, both weighed and measured, in which the graduations run entirely around the circumference of the article, and we refer, for a more detailed description of these goods, to the body of the catalogue. For advanced analytical work these all-around , graduations should be employed, as they are as near perfect (without error) as it is possible to make them. A certificate of accuracy accom- panies each instrument. The Bausch & Lomb Optical Company, G.m.b.H., No. 8i Kaiser- strasse, Frankfurt a/M., Germany, is our European correspondent and offers a most convenient means for the handling of our orders and those of American purchasers who desire to import direct from Eu- rope. We place this office and its staff at the disposal of our patrons, and shall be pleased to have them make that office their headquarters during a sojourn abroad, a place where their mail will be directed, or where they may gather goods from different parts of the Continent for final shipment. The business is officered by men speaking the English, German and French languages, and who are thoroughly acquainted with the requirements of American laboratories, as well as with every detail of the European market, and who, in addition to their ability to buy any make of apparatus from any maker, can supply a large part of the chemical glassware from their own factory, thus guaranteeing qual- ity and prompt delivery. Purchasers desiring small importations of special apparatus can place their orders with us, or with them, and have them forwarded with our large shipments, thus saving time and ex- pense. Frankfurt being a central seaport, all purchases from the va- rious makers are collected there and repacked when desired, in order to save transportation charges, which are rated by the steamship com- panies according to the space the articles occupy, regardless of weight and value. All of our shipments come by the fastest mail steamers, insuring the speediest deliveries possible. For the accommodation of our customers we carry in stock every article listed in this catalogue, and can furnish same at short notice at the prices listed herein, subject to discount to institutions purchasing in quantity. To institutions entitled to import duty free, we offer a printed bid- ding list, based on this catalogue, where the quantities desired can be set down and the list returned to us for pricing. Copies of this list will be sent free on application. In conclusion, we wish to solicit the orders for laboratory appara- tus of those who desire the best at the least cost, but particularly the best. The best is the cheapest in the long run and our specialty is high quality. Our prices are calculated to be the same whether bid is asked or not. While this is a comparatively new branch of our business, our connections are world wide, and the same liberal treatment of our pa- trons, together with the furnishing of superior goods at reasonable prices, which has built up the microscope, photographic and lens de- partments of our business until they are the largest of their kind in the world, has already won favorable consideration for us in this addition to our ability to serve our patrons. We are always glad to estimate on prospective orders and to sub- mit samples to demonstrate the quality of our wares when desired. BAUSCH & LOMB OPTICAL COMPANY. Rochester, N. Y., March, 1904. ELECTROTYPES. We will be pleased to loan Electro- types of any articles illustrated in our catalog to authors or others for the illustration of text books, periodicals, etc. TERMS Give full address and explicit shipping directions in all cases. In the absence of the latter we will use our judgment to secure the lowest rate of transportation. To avoid dela)', the full catalogue designation of each article should be gfiven. Be especially careful to mention the letter or figure denoting the si::c or style desired. When cash accompanies order and goods can be sent best by mail, add amount of postage to remittance ; otherwise goods will be sent by express at the purchaser's cost. Goods sent by mail are at purchaser's risk. Goods will be sent by express C. O. D. only when amounting to more than $5.00; purchaser to pay return charges. One-fourth of total amount, or proper references, should accompany the order. All goods are packed with utmost care by experienced packers and in such a manner that they should arrive safely, but unless we have orders to insure them, our responsibility ceases with their delivery, in good order, to the carrier. Fragile goods will be insured against breakage, if we are requested to do so when the order is placed, the fee for this insurance being three per cent (3%) of the net amount of the invoice. Prices will be subject to fluctuations of the market without pre- vious notice. We make no charge for packing or packing cases. BAUSCH & LOMB OPTICAL COMPANY'S CATALOGS In addition to this catalogue of Laboratory Apparatus and Supplies we issue a number of other catalogues, any of which will be mailed on request to those interested. A Microscopes and Accessories B Microtomes and Apparatus for Microtomy C Photomicrographic Apparatus D Projection Lanterns, Accessories, and Lantern Slides E Bacteriological Apparatus G Chemicals and Reagents H Photographic Lenses, Shutters, and Accessories Bausch & Lomb-Zeiss Stereo Binocular Field Glasses Bausch & Lomb Prism Binocular Field Glasses Centrifugal Blood and Urine Analysis Bausch & Lomb Plastigmat Lens Bausch & Lomb News. — A periodical of information about the Bausch & Lomb Optical Company's products. Manufactory of the BAUSCH & LOMB OPTICAL CO. Rochester, N. Y. 1904 12004 I2006 12008 12000. Acetometer, Otto's. For determining the percentage of acetic acid in vinegar; on wooden base. Each $0.60 12002. Acid Basins. Of porcelain. Diameter, mm. Each 12004. Acid Basins. Of porcelain. Diameter, mm. •35 -50 130 Each .85 Acid Bottles. See Bottles, Cob.\lt. 12006. Acid Pitchers. Of stoneware. ' Capacit}-, cc. 500 100 Each .20 .25 12008. Acid Pots. Of stoneware. Capacity, liters S 16 2000 •30 24 160 .60 1.40 4000 ■50 30 Each .70 1.70 40 2.50 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. .\. I20I8 I20I0 I20I4, I20l6 I20I0. Acid Pump. For drawing acids, ammonia, or ofher liquids from large containers. Gives continuous flow and may be checked in- stantly. Each $4.50 12012. Acidimeter, Gall's. Few determining the quantity of acid in wine. Each $2.00 12014. Acidimeter, Twitchell's. For estimating the amount of acid in vinegar. Each $15.00 12016. Acidimeter, Twitchell's. For estimating the amount of acid in wine. Each $15.00 12018. Adapters. Curved; heavy glass; for connecting retorts with receivers. Length, mm. 130 150 200 250 Diameter, mm. 25 40 50 60 Each .20 .25 .30 .40 Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. A., 12028 12026 IZ020. Adapters. Straight Length, mm. Diameter (See illustration, page 2.) 130 ISO 200 .250 mm. 25 40 50 60 Each .20 .25 .30 .40 12022. Aeroscope, Hesse's. For quantitative examination of air. Consists of a glass cylinder, for the culture medium, closed at one end with a rubber cap and connected at the other with a series of flasks for aspirating a known quantity of air into the cylinder. Each $18.00 12024. Aeroscope, Miquel's. For collecting bacteria from air by aspiration through a liquid medium. Made of glass. The neck extends into the flask and is covered by a cap ground on. Capacity, 150 cc. Each $1.10 12026. Aeroscope, Sedgwick-Tucker's. For collecting bacteria from a meas- ured quantity of air by filtering through soluble media. Consists of a glass cylinder, graduated into squares for counting, with a tube for holding the filtering material. Complete with funnel. Each $1.75 12028. Aeroscope, Straus-Wurtz's. For collecting bacteria from air by as- piration through water or gelatine. Made of glass. Each $1.10 Air Baths. See Drying Ovens. 12030. Air Pump, Arzberger-Zulkowsky's. on polished board. With two stop cocks; mounted Each $4.25 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 12034 1204a 12046 12048 12036 A 12040 12036 B 12032. 12034. 12036. 12038. 12040. 12042. 12044. 12046. 12048. 12050. Air Pump, Arzberger-Zulkowsky's. Glass parts only. Each $3.40 Air Pump, Chapman's. Made of brass and operated under ordinary water pressure. A very powerful pump. I 2 3 Numbers Each 1.50 1-75 Air Pump, Chapman's, Couplings for. When ordering state size of pump for which coupling is desired. A For threaded faucet. Each $0.35 B For smooth faucet. Each $0.55 Air Pump, Fisher's. Made of glass and used with water pressure for rapid filtration. Without stop cocks. Each $o.go Air Pump, Fisher's. Same as No. 12038, but with two stop cocks. Each $2.40 Of glass. Each $0.60 Any style imported or made to order. Of glass; with one suction tube. Each With two suction tubes. Each Air Pump, Geissler's. Air Pumps, Mercurial. Air Pump, Muencke's. Air Pump, Muencke's Air Pump, Richard's. only. Very powerful Sizes $1.15 $1.30 Made of brass and used with water pressure (See illustration, page 5.) Small Large Each 1-75 Baasth & Lomb Optical Co., Rochester, N. Y., U. S. A., I2064 12052. Air Pump, Richard's, Couplings for. When ordering state size of pump for which coupling is desired. A For threaded faucet. Each $0.35 B For smooth faucet. Each $0.55 12054. Air Pump, Richard's. Large size; with blast attachment. Complete. Each $7.50 12056. Air Pump. Brass; on base; with vacuum gauge. Each $8.25 12058. Air Pump. Same as No. 12056, but without gauge. Each $4.50 IZ060. Air Pump. Same as No. 12056, and with stop cocks at water and air connections. Each $10.00 12062. Air Pump. Same as No. 12060, but without gauge. Each $6.00 12064. Air Pump. For general laboratory use. ?ilade of brass, with ma- hogany base. The pump is 200 mm. by 30 mm.; the plate is 150 mm. diameter. Each $15.00 New York, Boston, Chicago, U. S. -A. Frankfurt a/il., Germany. 12076 12078 i2066. Air Pump, Pressure. Made of heavy material, highly polished and nickel plated. Has metal valve and is mounted on oak base. Chamber, 400x55 mm.; height, 540 mm. Each $6.00 12068. Air Pump, Pressure. Same as No. 12066 but has coupling nipple attachment for tubing. Base and handle have ebony finish. Each $6.50 fi Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. A., I2080 12070. Air Pump, Vacuum and Pressure. Same as No. 12066 but with two valves and two nipples for inlet and outlet of air. Each $8.75 12073. Air Pump, Compressed Air and Vacuum. Made of japanned zinc with polished and nickeled brass connections. Used with water pressure. With fixed pump and air connections. Each $10:50 12074. Air Pump, Compressed Air and Vacuum. With adjustable pump and connections. (See illustration, page 6.) Each $15.00 12076. Air Pump, Compressed Air and Vacuum. With adjustable pump and connections, and vacuum gauge with silvered scale. (See il- lustration, page 6.) Each $24.50 12078. Air Pump. With compressed air receiver, 325 x 200 mm., tested to SO kilos hydraulic pressure and warranted to stand the maximum pressure of 25 kilos. The pump chamber is 260 mm. long and 30 mm. diameter. Both pump and receiver are nickel plated. Com- plete with pressure gauge and 240 cm. of silk covered rubber tubing. (See illustration, page 6.) Each $23.75 12080. Air Pump. With compressed air receiver, 550x250 mm., having two exhaust valves and two tubes to connect with spray tubes. Tested to 50 kilos hydraulic pressure and warranted to stand the maxi- mum pressure of 25 kilos. The pump chamber is 400 mm. long by 50 mm. diameter. Pump and receiver are nickel plated. Com- plete with pressure gauge, 120 cm. of lined rubber tubing and 240 cm. of silk covered rubber tubing. Each $29.25 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. I2082 12086 i2ogo Handle For pressure only. This pump is more T „»r Handle For pressure omy. j."'= v""'*- 12082. Air Pump, Lever Handle. ^° y ,^ and a greater pres powerful tharv the ordmary ^ 1 ^ hai^dU ^P^u^^.P^^^ ^^^^ ^.^^^^ ^^^^^^ Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 12092 and mounted on an oak base. Total height 560 mm.; pump cham- ber, 300x50 mm.; handle 675 mm. long. Each $11.00 12084. Air Pump, Lever Handle. Same as No. 12082. For vacuum and pressure. Each $13.25 12086. Air Pump, Rotary. For pressure only. The pump chamber, 175 x 50 mm., is made of brass, polished and nickel plated. It has metal valves. The base, column and wheel are of iron, neatly japanned and ornamented in bronze. Height, 100 cm.; weight, 45 kilos. - (See illustration, page 8.) Each $36.25 12088. Air Pump, Rotary. Same as Xo. 12086. For vacuum and pressure. Each $38.50 i2ogo. Air Pump, Rotary. With compressed air receiver. The base, col- umn, and wheel are of iron, japanned black and ornamented in bronze. The receiver, 800x225 mm., and pump, 175x50 mm., are of brass, highly polished and nickel plated. The receiver is tested to 50 kilos hydraulic pressure and warranted to be air tight and stand the maximum pressure of 25 kilos. It has two high pressure exhaust valves and one inlet valve. Total height 105 cm.; weigh) 56 kilos. Complete with pressure gauge and 300 cm. of silk cov- ered tubing. (See illustration, page 8.) Each $77.00 12092. Air Pump Plates. On tripod base, with heavy plate glass top and two-way stop cock. Without receiver. Diameter, mm. 200 250 300 12094. Each 8.00 Air Pump Plates. With receiver. Diameter 200 Each 9.50 12.00 Alcoholometers. Sec Hydrometers, Alcohol. Alembics. See Fl.\sks, Distillixg. 300 14-50 New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. i2og8 12104 1 2106 12108 12096. 12098. 12100. 12102. 12104. 12106. 12108. 12110. 12112. 12114. 12116. Alkalimeter. Berzelius. Alkalimeter. Sink's. Capacity 30 cc (Other sizes see Sink's Burettes.) Alkalimeter. Bunsen's. Fresenius'. Fresenius-Will's. Fresenius-Will's. Improved form Alkalimeter. Alkalimeter. Alkalimeter. Alkalimeter. Each $0.60 graduated to i/io cc. Each $1.00 Each $1.00 Each $2.15 Each $0.40 orm. Each $0.45 Gay-Lussac's. Capacity 50 cc; graduated to l/io cc. Each $1.10 Alkalimeter. Geissler's. Style A. Each $1.25 Alkalimeter. Geissler's. For i acid. Each $1.35 Alkalimeter. Geissler's. For 2 acids. Each $1.50 Alkalimeter. Geissler-Erdmann's. (See illustration, page 11.) Each $1.50 10 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., I2Il6 I2I32 12118. Alkalimeter. Geissler's. Style B. [2120. Alkalimeter. Kipp's. [2122. Alkalimeter. Mohr's. 12124. Alkalimeter. Mohr's. New model. 12126. Alkalimeter. Mohr's. Latest model. 12128. Alkalimeter. Rohrbeck's. 12130. Alkalimeter. Schroedter's. 12132. Alkalimeter. Schroedter's. With tube. 12134. Alkalimeter. Ure's. With glass stopper. Capacity 100 grams, grad- uated to I gram. Kach $1.00 12136. Ammonia Condensation Apparatus. Mueller's. For demonstrating the principle of Carre's ice machine. Each $3.00 Each Each Each Each Each Each Each Each $1.60 $1.60 $0.50 $2.75 $2.25 $1.60 $1.50 $1.60 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. II 1 2138. 12140. 12142. 12144. 12146. 12148. 12138 12143 12140 Anatomical Models. For class demonstration in physiology and ele- mentary anatomy. Each is arranged so that it may be taken apart to show the important parts. The material used in construction is light and durable. An explanatory key is furnished. Anatomical Models. Human Ear, 390 mm. in diameter. Each. .$10.00 Anatomical Models. Human Eye, enlarged six diameters. Each $10.00 Anatomical Models. Human Heart, enlarged two diameters. Each $7.50 Animal Holder. For mice. A cylindrical jar with nickel plated cover having woven wire center. The cover is held on by a catch and can be released only by turning it around to the proper point. No extra weights are required. Has ground label for writing data. Diameter 150 mm.; height 200 mm. Each $2.00 Animal Holder. For inoculating mice. 2\fade entirely of metal. The conical wire cage is detachable and may be renewed. Has ad- justable clamp for holding the tail of the animal. Each $1.25 Animal Holder, Kitasato's Autopsic. For mice. Nickel plated metal plate with spring clamp for fastening the animal by the skin of the neck, and a spring clip for holding the tail or leg. The plate may be supported in any position by ball and socket joint on the pillar. (See illustration, page 1.3.) Each $4.00 12 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., .. ■ .. •«! ,:; t- ^ 12144 12152 12148 12154 12146 12150. Animal Holder, Latapie's. For rabbits, guinea pigs, pigeons, etc. Consists of a fiat table with clamps and spring catches. Imported to order only. Price quoted on request. 12152. Animal Holder, Vaughan's. For inoculated rabbits, guinea pigs, etc. Has metal frame worlc and woven wire sides and lid. The bottom slopes slightly toward the center to a hole, which facilitates clean- ing. Is collapsible for compactness in sterilization and storage, the sides, top, bottom, and legs being in separate pieces. The lid is hinged. Height (not including legs) 300 mm.; total height, 420 mm.; length, 500 mm.; width, 380 mm. Each $8.50 12154. Animal Holder, Voges'. For guinea pigs, ilade of zinc. Size of holder, mm. 180x60 200x80 Size of slot, mm. 100x20 100x25 Each .60 •75 New York, Boston, Chicago, U. S. -V. Frankfurt a/M., Germany. 13 I2i68 12170 1 21 66 12162 1 21 64 12160 12156. Annealing Cups, Battersea. For melting gold. Height, mm. 28 30 37 4S Diameter, mm. 28 30 37 5° .90 .90 .90 .90 1 2158 12160. Per ten. Net $0.25 Per ten. Net Annealing Cup Covers. Anvils. Steel, with polished face. Length, 115 mm.; weight 500 grams. Each $1.00 12162. Anvils. Steel, with square, mirror-polished face. Size of face, mm. 38 45 So 12164. 1 21 66. 12168. Each .60 .75 ,1.00 Anvils. Steel, with square, mirror-polished face. Size of face, mm. 25 38 50 62 75 Each .65 1. 00 1.25 1.70 2.00 Anvils, with Vises. Of japanned iron. Width of jaws, mm. 38 45 So Each .50 .bo .75 Anvils, with Vises. Of best car-wheel iron, with faces chilled hard and smooth. Area of face, mm. 115x50 160x75 200x85 215x100 Width of jaws, mm. 62 85 100 115 Weight, kilos 4 II 16 22 Each 12170. 2.00 5.00 6.00 7.00 Anvils, with Vises. Iron, with steel jaws. The strongest, most practical, and finest made tools of the kind in the market. Width of jaws, mm. 38 50 62 Weight, grams 1250 1870 3750 Each 1.50 2.40 3-25 14 Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. A., A B 12180 C D 12180 12172. 12174. 12176. 12178. Apparatus Supports. See Supports. Areometers. See Hydrometers. Arsenic Apparatus, Fresenius'. For the detection of arsenic. With- out support. Each $0.60 Arsenic Apparatus, Marsh's. For the detection of arsenic. Complete with brass stop cock. Each $2.85 Arsenic Apparatus, Marsh's. Glass parts only. Each Arsenic Plates. Of unglazed porcelain. Size, mm. 38x75 50x75 75x100 $0.40 Each .15 .15 12180. Arsenic Tubes. Of Bohemian glass. Style A B •IS D Per ten .35 .35 12182. Arsenic Tubes. Of German glass. Style A B •35 •35 D 1 2184. 12x86. Per ten .20 .20 .20 Asbestos Apron. Fire and acid proof. Each $3.oc Asbestos Board. Fire and acid proof. In sheets i meter square. Thickness, mm. .75 1.5 2.25 3 5 6 9 12 Weight, kilos .75 2 2.50 3.50 5 7 10.5 14 Per 500 grams •15 •15 ■IS -IS •15 •15 •15 •IS New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 15 -r^^T^mr"— I2ig8 12188 12188. i2igo. 12192. 12194. Asbestos Board. Cut in squares. Thickness, mm. .75 .75 ,75 Size, mm. 100 125 150 i-S 100 1-5 125 Per ten Asbestos Cement i-S ISO 12196. 12198. .15 -25 -3° -30 45 -60 Fire and acid proof. Ready for use. Per 2.5 kilo can $0.50 Asbestos Cloth. Fire and acid proof. Width, 90 cm. (i yd.) Weight, grams, per 90 cm. (i yd.) 900 1260 1680 Per 90 cm. (i yd.) 2.50 2.50 2.50 Asbestos Cord or Twine. For wrapping handles of apparatus which become hot, and suspending crucibles, retorts, etc., in contact with fire. Diameter, mm. i 1.5 3 Per pound i.io i.io i.io Asbestos Fiber. See Chemical List. Asbestos Mittens. Fire and acid proof. Per pair $3.25 Asbestos Pads. Square, bound with metal. Thickness, 1.5 mm. Size, mm. 75 100 125 150 Each .10 .12 .13 .15 Asbestos Pads. Square, bound with metal. Thickness, 3 mm. Size, mm. 75 100 125 150 Each .18 .12 .13 .14 Asbestos Pads. Square, bound with metal. For use under heated vessels, etc. Size, mm. 165 200 250 330 500 Each •45 ■50 .60 .70 •95 16 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., I22I4 12004- Asbestos Pads. Oblong, bound with metal. Size, mm. 250x150 350x250 500x350 Each .25 .40 .65 12206. Asbestos Paper. For filtering acids, etc. Of pure, white fiber; in sheets 90 cm. square. Per pound $0.20 12208. Asbestos Paper. Extra thin. In sheets 225 x 350 mm. Per pound $0.30 Asbestos Powder. See Chemical List. Asbestos Wool. See Chemical List. 12210. Aspirator, Double. Made of zinc, japanned. Reversible for contin- uous suction. Capacity of each reservoir, liters. 5 10 Each 7.50 9.00 12212. Aspirator, Magnus. Double, for continuous suction without change of connections. Reservoirs niade of zinc. Capacity of each reservoir, liters, 5 10 Each 20.00 25.00 12214. Aspirator, Liebig's. With funnel tube and syphon. Capacity, liters i 2 Each 1.50 1.75 Aspirator Bottles. See Bottles. Azotometers. See Gas Apparatls ; Xitrometers. New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. 17 J^ ii™ 12216 BALANCES The balances and weights here listed have been carefully chosen from the best American and European makes. Our Analytical and Assay Balances are specially made for accurate scientific work and are accepted in government, college, and commercial labora- tories as the very best obtainable instruments for precise and rapid weighing. They are of the finest workmanship throughout and are handsomely finished. We can supply any other make or style of balance to order. The Circular Beam Analytical Balances are of new construction and entirely diflferent from any balances now on the market. The location of the middle axis in the center of the circular beam gives an action extremely smooth and steady, which cannot be obtained with any other form of beam. The beam, being made of uniform weight throughout the circle, gives a rigidity which is not found in any other form. These advantages render this form of balance very sensitive and cause the pointer to indicate the slightest increase or decrease in weight. One-tenth of a milligram will cause the- pointer to move from the point 10 to 10 of the scale for 15 seconds, even when the balance is loaded to its full capacity, and after 5 minutes time the pointer will not show a loss of even one division of the scale. 18 BauscU Sr Lomb Optical Co., Rochester, N. Y., U. S. A., 1 221 8 12216. Balance, Analytical, B. & L. Circular Beam. This balance has triple release and arrest for beam, pans, and hangers. The bearings and knives are of agate and are all located within the circle of the beam. Beam, hangers, and pans platinum plated. The scale is suspended by means of brass frame from the top of the case, doing away with a pillar, thus gaining room in the case and making it possible to use pans of larger diameter without increasing the width of beam. In mahogany case with hinged side doors and counterpoised front door, mounted on black plate glass. Provided with rider attachment. Capacity, 200 grams; sensitive to i/io mil- ligram. Each, Net $g6.oo 12218. Balance, Analytical, B. & L. Circular Beam. This balance has cir- cular aluminum beam, agate bearings and knife edges, and plati- num plated pans. The beam, pans and hangers are controlled by triple release and arrest operated from the central axis. The pillar is of brass, highly polished and mounted on black plate glass. The case is finely finished mahogany and has counterpoised door. Capacity 200 grams; sensitive to i/io milligram. Complete with rider attachment and leveling screws. Each, Net $76.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 19 Balance, Analytical, B. & L. Circular Beam. This balance has cir- cular aluminum beam, agate bearings and knife edges, and plati- num plated pans. The beam and pans are controlled by double re- lease and arrest operated from the central axis. The pillar is of brass, highly polished and mounted on black plate glass. The case is of finely finished mahogany, and has counterpoised door. Ca- pacity 200 grams; sensitive to l/io milligram. Complete with rider attachment and leveling screws. Each, Net $58.00 20 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 12324 12222. Balance, Analytical, B. & L. This is a short arm balance with alu- minum beam provided with adjusting screws at both ends and agate bearings and agate knife edges. The entire scale is heavily platinum plated and is non-corrosive. The rider has full sweep across the beam which is graduated to l/io milligram from o to both ends. The pans are made of aluminum, and are provided with improved arrest and automatic stop. This balance is furnished with apparatus for taking specific gravity and metal stand for weighing tubes. In handsome case with glass top and sliding doors. Capacity loo grams in each pan; sensitive to i/io milli- gram. Diameter of pans, 75 mm.; space between bows, 100 mm. Complete with set of accurately adjusted and heavily platinum plated weights, from 50 grams to i milligram and 3 riders. (Sec illustration, page 20.) Each, Net $60.00 12224. Balance, Analytical, B. & L. A short arm balance provided with new improved arrest for beam and pans, rider attachment, and apparatus for specific gravity and for weighing tubes. All bear- ings are agate planes and agate knife edges. The beam is grad- New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. 21 12230 uated to l/io milligram and in such manner that the rider can be placed on the center of the beam and used from the o point to either end. In French polished mahogany and glass case with glass top and counterpoised sliding front door, mounted and fastened on plate glass. Capacity 200 grams in each pan; sensitive to 1/20 mil- ligram. Diameter of pans, 60 mm.; width of bows, 100 mm., but can be made wider if desired. Each, Net $125.00 12226. Balance, Analytical, B. & L. Same as No. 12224, t>ut with adjust- able shelf for supporting beaker with water when taking specific gravity. Each, Net $138.00 12228. Balance, Analytical, B. & L. Same as No. 12224, but with aluminum beam, bows, etc. Each, Net $145.00 12230. Balance, Analytical, B. & L. A short arm balance with improved pan arrest, vider attachment, and agate bearings. The beam is graduated to l/'s milligram. In French polished mahogany and glass case with glass top and counterpoised sliding front door. Capacity, 100 grams in each pan; sensitive to i/io milligram. Each, Net $60.00 22 Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. A., 12236 12230 but with agate Each, Net $68.00 12232. Balance, Analytical, B. & L. Same as No. knife edges. 12234. Balance, Analytical, B. & L. Same as No. 12230 but with agate knife edges, and aluminum beam, bows, pans, etc. Each, Net $80.00 Balances Nos. 12230, 12232 and 12234 mounted on plate glass. Each, Extra $10.00 12236. Balance, Analytical, B. & L., Improved. This is a reliable, low- priced balance with arrest for pans, and all bearings of agate. In French polished glass case with counterpoised sliding front door. Capacity, 100 grams in each pan; sensitive to % milligram, with full charge. Each, Net $45.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 23 12243 12238. Balance, Analytical, B. & L. Same as No. 12236 but with rider attachment. Each, Net $50.00 12240. Balance, Analytical, B. & L. Same as No. 12236 but mounted on plate glass. Each, Net $60.00 12242. Balance, Analytical, Kohlbusch's Improved. This is a short arm balance with aluminum beam and agate ^bearings and knife edges. All parts are heavily platinum plated. The rider has full sweep across the beam which is graduated on both sides. Mounted on plate glass and enclosed in handsome mahogany glass case with glass top and counterpoised front and back doors. Supplied with 24 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 12244 apparatus for specific gravity and stand for weighing tubes. Ca- pacity, 200 grams; sensitive to 1/20 milligram. Space between bows, 100 mm. which may be increased if desired. Complete with set of heavily platinum plated weights, 100 grams to i milligram, and 3 riders. Each, Net $121.50 12244. Balance, Analytical, Kohlbusch's. A short arm, heavily platinum plated balance, with agate planes and agate knife edges. Has full beam arrest which lifts all planes free from the knives. The rider has full sweep across the beam which is graduated to i/io milli- gram from o to both ends. Furnished with parts for taking spe- cific gravity and for weighing tubes. In handsome case with glass top and bottom and sliding doors. Capacity 100 grams; sensitive to i/io milligram. Diameter of pans, 75 mm.; space between bows, 100 ram. Complete with set of heavily platinum plated weights, from 50 grams to i milligram, and 3 riders. Each, Net $100.00 New York, Boston, Chicago, U. S. .\. Frankfurt a/M., Germany. 25 12246 1224^ 12246. Balance, Analytical, Kohlbusch's. This is a short arm balance with all bearings of agate, and improved beam and pan arrest. Pro- vided with apparatus for taking specific gravity. The rider has full sweep across the beam which is divided to i/s milligram. Mounted in handsome case with glass top. Capacity 200 grams; ' sensitive to i/s milligram. Diameter of pans, 75 mm. Each, Net $58.50 26 Bauscb Sr Lomb Optical Co., Rochester, N. Y., U. S. A., I22S0 12248. Balance, Analytical, Kohlbusch's. This balance has agate bearings throughout and is provided with arrest for beam and pans. Has rider . attachment and arrangement for taking specific gravity. Mounted in handsome glass case. Capacity, 100 grams in each pan; sensitive to ^ milligram. Diameter of pans, 75 mm. (See illustration, page 26.) Each, Net $47.00 12250. Balance, Analjrtical, Sartorius'. Patent short arm balance with aluminum beam, agate bearings and knife edges, adjustment for axes and compensating hangers, and platinum plated pans. In handsomely finished, bronzed brass case with counterpoised slid- ing front and hinged side doors. Mounted on black plate glass. Capacity, 100 grams; sensitive to 1/20 milligram. Length of beam /20 mm. Each, Net $195.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 27 12252 12252. Balance, Analytical, Sartorius'. A short arm balance with triangular beam of gilded phosphor bronze, knife edges and planes of agate, pans platinum plated, compensating hangers, rider attach- ment, and axes adjustments with a circular movement which pro- vides for the release and arrest of the beam and suspensions, and which possesses a common axis with the central knife edge. The scale for the rider, with a parallelogram arrangement for moving it, is placed in front of the beam. In polished mahogany case with counterpoised sliding door, mounted on black plate glass. Capa- city, 200 grams; sensitive to i/io milligram. Length of beam, 140 mm. Each, Net $120.00 28 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 13254 12254- Balance, Analytical, Sartorius'. Patent short arm balance with straight aluminum beam, which at the same time forms a scale for the rider, and knife edges and planes of agate. The circular move- ment providing for the release and arrest of the beam and suspen- sions has common axis with the central knife edge, so that at what- ever point the swinging is arrested, no change of axis can take place. Has platinum plated pans, adjustments for the axes, com- pensating hangers and rider attachment. Capacity. 200 grams; sen- sitive to r/io milligram. Length of beam, 140 mm. Each, Net $80.00 New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. 29 I22S6 12256. Balance, Analytical, Sartorius'. A short arm balance with triangular beam and provided with rider attachment. The beam, pans, and hangers are fitted with arrest of circular movement. Has platinum plated pans, and agate knife edges and agate planes. Although low in price, this balance meets the highest expectations in accu- racy and quickness of weighing. In black walnut case with coun- terpoised sliding door, mounted on black plate glass. Capacity, 200 grams; sensitive to l/s milligram. Length of beam, 140 mm. Each, Net $60.00 12258. Balance, Analytical, Sartorius'. Same as No. 12256 but without rider attachment. Each, Net $48.00 12260. Balance, Analytical, Troemner's. This balance is of the finest work- manship throughout and is in use at the U. S. Coast Survey and all 30 Bauscb Sr Lomb Optical Co., Rochester, N. Y., U. S. A., I226o 12262 the large iron and steel works. It is a short arm balance with aluminum beam, agate planes and agate knives. Both arms of the beam are graduated. The pans are of aluminum; all brass work is gold plated. Provided with improved self-locking pan arrest, mounted in elegant mahogany case with glass top and heavy plate glass bottom. Capacity, 200 grams; sensitive to 1/20 milligram. Each, Net $125.00 12262. Balance, Analytical, Troemner's. A short arm balance with alumi- num beam, both arms of which are graduated to i/io milligram, and agate bearings throughout. The bows, 100 mm. wide, and pans are of nickel. Mounted in fine French polished mahogany case with plate glass bottom. Capacity, 200 grams; sensitive to i/io milligram. Each, Net $g6.oo New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 31 12264 12268, 12270 12264. Balance, Analytical, Troemner's. A short arm balance with agate bearings, improved pan arrest and extra wide bows. The beam is 150 mm. long and graduated to 1/5 milligram. Mounted in pol- ished mahogany case with counterpoised door. Capacity, 100 grams in each pan; sensitive to i/io milligram. This balance is especially desirable for students' use in college laboratories. Each, Net $60.00 J2266. Balance, Analytical, Troemner's. Same as No. 12264 but with agate knives. Each, Net $70.00 12268. Balance, Analytical, Troemner's. Specially adapted for students' use, also for manufacturing establishments, etc. Has open beam. 32 Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. A., 12272 12274 graduated to yi milligram, with improved rider attachment. All bearings are agate. In fine French polished mahogany case. Capacity, 100 grams in each pan; sensitive to '4 milligram. Pans 75 mm. diameter, fitted in wide bows. Each, Net $50.00 12270. Balance, Analytical, Troemner's. This balance has steel bearings throughout. In French polished case with counterpoised sliding door. Capacity, 100 grams in each pan; sensitive to 14 milligram. Diameter of pans, 85 ram. Each, Net $40.00 12272. Balance, Assay, B. & L. Circular Beam. This balance has triple re- lease and arrest for beam, pans, and hangers. The rider scale is graduated in 100 divisions, reading from a central o to both sides of the beam. A magnifying lens is provided whereby the divisions although very small can be read with the same ease as wider divi- sions on a longer beam. The beam is only go mm. long; such a short beam would be impossible in any other construction. The beam is very light, made of aluminum and both it and the pans are gold plated. The knife edges and planes are of agate. In finely polished mahogany case, mounted on black plate glass. Sensitive to 1/200 milligram. Each, Net $120.00 12274. Balance, Assay, B. & L. This balance is of finest construction throughout, with triple release and arrest for beam, pans, and hangers. Knife edges and planes are of agate. Beam divided into 100 parts and provided with, rider attachment. Both beam and pans are heavily gold plated. Case is of fine mahogany with side doors and counterpoised sliding front door, mounted on black plate glass. Capacity, 10 grams; sensitive to i/io milligram. Each, Net $75.00 New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. 33 I228o 12276. Balance, Assay, Kohlbusch's. A short arm balance with aluminum beam and hangings, and agate bearings. Heavily platinum plated throughout. Rider has full sweep across the beam which is grad- uated in 50 parts on each side. Improved full beam arrest, all bearings lifted from knives when at rest. In handsome, polished mahogany case with counterpoised sliding door. Sensitive to 1/500 milligram. Complete with set of specially adjusted weights from I gram to i/io milligram and 2 riders of J^ and I milligram. Each, Net $go.oo 12278. Balance, Assay, Kohlbusch's. Same as No. 12276 but fitted on plate glass. Each, Net $100.00 12280. Balance, Assay, Kohlbusch's. With short aluminum beam, divided to i/ioo milHgram, agate knife edges and agate planes, and im- proved beam and pan arrests. Rider has full sweep across the beam. The entire balance is heavily platinum plated; hangings all aluminum, supplied with magnifying gFasses to read the divisions on the beam and indicator. In fine glass case with sliding door, mounted on plate glass. Adjusted to the highest attainable sensitiveness. Each, Net $117.00 34 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 12284 12282 12282 (Case) 12282. Balance, Assay, Kohlbusch's Portable. This is an improved form of balance with new attachment to keep beam in place so that it does not need to be removed when traveling and the balance can be set up in working order in ten seconds. All bearings are agate; hang- ings of aluminum. Has rider attachment. The needle deviates over 20 divisions for i milligram. Supplied with full set of plati- num weights from i gram to i/io milligram, and rider. Complete with light outside case and strap with handle for carrying. Each, Net $68.00 12284. Balance, Assay, Troemner's. A short arm balance of the very finest and most delicate construction. The beam 150 mm. long, and its hangers are of pure aluminum; the bearings and knives are of agate. Has double column with improved eccentric lift, releasing the pans first and then the beam by one operation. Both arms of the beam are graduated into equal parts. The needle moves over New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 35 I228S 12285 100 divisions for i milligram, showing the extreme sensitiveness of 1/200 milligram. In glass case with glass top and heavy plate glass bottom. Each, Net $165.00 12286. Balance, Assay, Troemner's. Used in U. S. Assay Offices and U. S. Mints. Has open beam of pure aluminum, divided to l/io milli- gram. All bearings are agate. The balance has new improved arrest for riders, and the needle indicates 50 full divisions on an ivory scale for i milligram. This balance is built on latest im- proved form and is of great excellence and simplicity of construc- tion. Fitted in mahogany case with glass top and heavy plate glass bottom. Sensitive to i/ioo milligram. Each, Net. $95.00 12288. Balance, Assay, Pocket. For traveling purposes. The beam is raised and lowered by means of drop lever. Case when closed measures 150 mm. long, 70 mm. wide, and 32 mm. high. Capacity, 10 grams; sensitive to % milligram. Complete with set of weights, 10 grams to I milligram, fitted into box as shown in illustration. A half assay ton weight will be supplied in place of the 10 gram weight, making the balance serve for pulp scale or assaying where % milligram is sufficient. Each, Net $16.50 36 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., I22go b=di 12292 12290. Balance, Troemner's Laboratory. This is an extra fine balance hav- ing a gold plated beam with adjusting screws at both ends. The other parts of the scale are nickeled with the exception of the pans which are solid silver. All of the bearings are jeweled and New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. 37 I22g6 the balance is provided with a delicate pointer which moves over a scale at the base of the pillar. The extra large case is of French polished mahogany with counterpoised door sliding upwards, level- ing screws and level. Diameter of pans, 75 mm. Capacity, lOO grams; sensitive to J4 milligram. Each, Net $45.00 12292. Balance, Improved Laboratory. Open beam fitted with adjusting screws at both ends. The pans, 75 mm. diameter, are nickel plated. Case of polished mahogany with glass sides and top, slid- ing door, leveling screws and spirit level. Capacity, 100 grams". sensitive to 1-2 milligram. (See illustration, page 37.) Each, Net $25.00 12294. Balance No. 12292 with agate bearings. Each, Net $30.00 12296. Balance, Laboratory. This balance is especially adapted to general laboratory work, assaying, etc., being accurate and convenient in use. The beam has adjusting screws at both ends. Mounted on base with drawer. Capacity, grams 60 150 300 900 1500 3000 Diameter of pans, mm. 75 85 no 140 175 200 Sensitiveness, milligrams I i 2 2 10 20 Each, Net 11.00 15.00 22.00 26.00 35.00 48.00 12298. Balance No. 12296 in glass case. Each, Net 20.00 24.00 31.00 42.00 52.00 72.00 12300. Balance No. 12296 in glass case. With leveling screws and spirit level. Each, Net 24.00 28.00 34.00 45.00 55.00 75.00 38 Bauscli & Lomb Optical Co., Rochester, N. Y., U. S. A., 12302 12302. Balance, Chemical. For weighing chemicals, etc. This balance is made of polished brass, except the pans which are nickeled. Beam, 225 mm. long, provided with adjusting screws. Mounted on pol- ished wooden box with drawer. Diameter of pans, 75 mm. Sen- sitive to 3 milligrams. Each, Net $9.00 12304. Balance, Chemical. Same as No. 12302 with set of weights 20 grams to I centigram. Each, Net $12.00 12306. Balance, Chemical. For technical work. Made of brass, heavily lac- quered. Has eccentric lift. Mounted on base with drawer. Length of beam, 150 mm.; diameter of pans, 75 mm. Sensitive to I centigram. (See illustration, page 40.) Each, Net $6.00 12308. Balance, Micro-Chemical. This balance, although low in price, is of sufficient accuracy for weighing out the reagents and chemicals necessary for making up the solutions, etc., generally used in mi- cro-biological work. The metal parts are nickeled and are mounted on an oak base with drawer for weights. Length of beam, 150 mm.; diameter of pans, 75 mm. Each, Net $2.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 39 12306 I2308 12310. Balance, Laboratory. For laboratorv and technical use. Open beam with adjusting screws, steel bear^gs and eccentric arrangement tor liftmg. With removable pans. All parts heavily lacquered. 40 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 18314 Capacity, kilos. 'A I 2 5 Length of beam, mm. 290 340 380 420 Diameter of pans, mm. 130 ISO 180 220 Sensitiveness, milligrams 10 20 40 100 24.00 30.00 32.00 38.50 Has two por- Without base, Each, Net 17.50 20.00 12312. Balance No. 12310 on polished base. Each, Net 18.75 21.50 25.75 12314. Balance No. 12310 on polished base with drawers. Each, Net 22.50 26.50 31.25 12315. Balance, Harvard Trip. For general laboratory use. cclain plates, square or circular as desired, 150 mm. diameter. (Square plates sent unless otherwise ordered.) Beam graduated in i/io gram divisions up to 10 grams. Capacity, i kilogram; sen- sitive to i/io gram. (See illustration, page 42.) 12318. Balance, Howe's. Two iron plates, patent frame, and weights com- plete. Metric weights sent unless otherwise ordered. (See page 42.) Capacity; 10 grains to i 3 S 7 kilos. Without scoop. Each, Net 4.25 12320. With tin scoop. Each, Net 4.75 12322. With brass scoop. Each, Net 5.50 5.00 5-75 7-75 5-75 7.00 g.oo 6.50 8.00 10.00 New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. 41 12324 I23I6 I23JtS 12326 12324. Balance, Robervahl's. For coarse weighing. Neatly finished through- out; metal base; brass pans. Without side beam. Capacity, kilos. i 3 S 10 Diameter of pans, mm. 125 150 200 225 Each, Net 2.80 3.60 4.00 5.00 12326. Balance No. 12324 with side beam. 42 Each, Net 5.00 5.50 7.00 8.00 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 12328 12330 12332 12334 12328. Balance, Torsion. Very accurate and handsome, nickel plated throughout and mounted in glass case. Beam graduated to 250 grams. Pans 225 mm. diameter. Capacity, 10 kilos.; sensitive to i/io gram. Each, Net $35.00 12330. Balance, Torsion. A handsome balance mounted in glass case. Beam has rider and is graduated on upper edge from J^ to 8 grains and on lower edge from 5 milligrams to ^ gram. Diameter of pans, 75 mm. Capacity, 250 grams; sensitive to i milligram. Each, Net $35.00 12332. Balance, Torsion Laboratory. Especially adapted to general labora- tory work. Has no knife edges to rust or wear out. All parts, ex- cept the pans which are nickeled, are neatly japanned. Pans, 150 mm. diameter. Capacity, 5 kilos.; sensitive to Y-z gram. Each, Net $9.75 12334. Balance No. 12332 with beam graduated to Y2 gram. Each, Net $11.50 12336. Balance, Torsion Micro-chemical. Of extremely stable and durable construction, there being no bearing surfaces to wear out or rust. The metal parts, except the pans, are enclosed in an enamelled case. Pans, 100 mm. diameter, of German silver. Capacity, 500 grams; sensitive to s milligrams. (See page 44.) Each, Net $iz.oo New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 43 12338 12342 12338. Balance, Troemner's New Agate. This is an entirely new balance in form and design, of the very finest workmanship and finish. The box has frame of rich mahogany witli beveled glass front, ends and top. The inside works are highly finished in nickel. All working- parts are jewelled, being set with Russian agates, thus making the scale indestructible, ' lasting a lifetime without repairs. Diameter of pans, 225 ram. This balance will be supplied with antique oak frame, if desired, at the same price. Each, Net $35.00 12340. Balance, Troemner's Laboratory. This balance is made in the most substantial manner. All the working parts are set with flexible steel bearings. The movement is the latest improved, combining great capacity, high sensibility, and smooth action. Has large heavy brass pans, 325 mm. diameter. Capacity, 5 grams to 20 kilos. Each, Net $32.00 12342. Balance, Troemner's Prescription. This scale is of the very finest workmanship throughout. The bo.x is of French polished ebony with marble top, which has recess for the weights, and glass cover with stop hinges. The pans are solid nickel. Sensitive to 3 milligrams. Diameter of pans, mm. 75 95 Each, Net 18.00 20.00 44 Batisch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 12350 12346 12348 1 2344 12344. Balance, Troetnner's. In ebony box with dial and marble top. Heavy nickel plated pans. Diameter of pans, mm. 175 200 225 Capacity, kilos. ; 8 10 Each, Net 14-00 16.00 12346. Balance, Troemner's Trip. Very substantial and reliable. Orna- mented in black and gold. Has one heav3' brass pan which i^ removable. Diameter of pans, ram. 175 225 300 400 475 Capacity, kilos. 2 4 10 15 20 Each, Net 5.00 6.00 7.00 10.00 14.00 12348. Balance, Troemner's New Laboratory. For accurate weighing. This balance is especially designed for laboratory and pharmaceutical work. Has removable pans, 150 mm. diameter. Capacity, 500 grams in each pan; sensitive to S centigrams. Supplied with full set of weights, from 200 grams to I centigram, neatly fitted in a projecting shelf on base of balance. Each, Net. $g.oo New York, Boston, Chicago, U. S. A. Frankfurt a/M.. Germany. 45 12352 12350. Balance, Troemner's New Dispensing, This is a handsomely finished scale with nickel plated, removable pans, 95 mm. diameter, and side beam divided on upper edge into 120 divisions each division repre- senting I grain, on the lower edge into decigrams. Capacity, 60 grams; sensitive to S centigrams. Supplied with set of brass weights from 50 grams to i centigram fitted into a shelf at base of scale. (See illustration, page 45.) Each, Net $8.00 12351. Balance, Specific Gravity, Jolly's Spiral. This is an improved form of the Jolly balance and in simplicity of construction, accuracy of result and speed of operation is far superior to the old form. Each, Net $15.00 12352. Balance, Specific Gravity, Kohlbusch's Hydrostatic. Specially de- signed for school and commercial use. The scale can be used for ordinary weighing by substituting the scale bow in place of the counterpoised pan. Mounted on base with drawer. Capacity, i kilo to I centigram. Length of beam, 250 mm.; diameter of pans, 135 mm. Complete with set of brass weights, 500 grams to I centigram. Each, Net $25.00 46 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 1 2358 I23S4 12356 12354. Balance, Specific Gravity, Mohr's. With Reimann's thermometer. For liquids and solids. Accurate to the fourth decimal. Made o£ lacquered brass; with adjustable support. Complete with set of pans for ordinary weighing, and set of riders. Each, Net $15.00 12356. Balance, Specific Gravity, Sartorius' Hydrostatic. For liquids. The use of the very hardest materials, and weights with loops of tem- pered steel render this balance the most accurate and durable pos- sible to construct. Provided with large Reimann's displacement body (displacement 10 c.c. of water), thermometer, and riders which weigh accurately 10, i, .1, and .01 gram. Each, Net $23.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 47 12360 I23S8. Balance, Specific Gravity, Westphal's. With Reimann's thermome- ter. The handiest and most improved form for quick determina- tion of the specific gravity of liquids. Accurate to the fourth decimal. Adjustable support on polished hardvirood box which will enclose the whole apparatus. Complete with set of riders. (See illustration, page 47.) Each, Net. $10.50 12360. Balance, Specific Gravity and Prescription. This is an exceedingly accurate and well made balance and is so constructed as to serve for specific gravity weighing with Reimann's patent thermometer and also for general laboratory purposes. It has short aluminum beam with arrest, nickel plated scale pans 70 mm. diameter and extra Papier-Mache pans. Capacity, 200 grams; sensitive to I milligram. Each, Net $23.00 48 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 12364 12362. Balance, Hand. With polished brass beam, steel knife edges, horn pans, and silk cord. Length of beam, mm. 150 175 200 Dameter of pans, mm. 60 75 90 Each, Net 1.25 1.50 12364. BALANCE WEIGHTS Gram Weights, Analytical, B. & L. Gram pieces gold plated; frac- tional pieces and two riders of platinum. Adjusted with the greatest accuracy. Furnished in velvet lined polished mahogany box with ivory tipped forceps, and fractional pieces covered by glass plate. These are the finest weights possible to produce and we guarantee them to be exactly as representd. Sets, I milligram to 10 20 50 100 grams Per set. Net 7.00 7.75 9.00 Sets, 1 milligram to 200 500 1000 grams Per set. Net 15.00 18.00 25.00 New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. 49 12368 A 12370 12366. Gram Weights, Single Analytical, B. & L. Same as weights in sets No. 12364. (See illustration, page 51.) Milligrams i 2 5 10 20 Each, Net .10 .10 .10 ■IS •IS Milligrams SO 100 200 500 Each, Net .20 •30 •50 1. 00 Grams I 2 S 10 20 Each, Net .40 •45 .60 .70 .80 Grams 50 100 200 500 1000 Each, Net i.io 1.75 2.25 2.75 3.50 12368. Gram Weights, B. & L. Of platinum and aluminum. In polished mahogany case with ivory tipped forceps. These sets are the same quality as sets No. 12364. A. Set including weights from i/io milligram' to I gram. Per set, Net $6.75 B. Set including weights from i milligram to ^ gram. Per set. Net $3.75 12370. Gram Weights. Gram pieces nickel plated; fractional pieces of alum- inum. Adjusted with the greatest accuracy. Furnished in velvet lined, polished mahogany box with nickeled forceps. A very re- liable set. Sets, I milligram to 20 50 100 200 grams Per set. Net 2.40 3.00 3.40 5.00 Sets, I milligram to 500 1000 2000 5000 grams Per set. Net 6.50 8.50 15.50 25.00 CO Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 12376 !>i 12374 12366 and 12372 12372. Gram Weights, Single. Same quality as weights in sets No. 12370. Milligrams i 2 5 10 20 50 100 200 500 12374- 12376. Each, Net Grams .10 2 .10 .10 10 .10 20 Each, Net Grams .10 50 .10 100 .10 200 .10 SCO .10 1000 Each, Net .20 .30 Gram Weights. Of Aluminum. .60 •90 1.75 Very accurately adjusted. In pol- ished mahogany box with nickeled forceps. Set includes weights from I milligram to I gram. Per Set, Net $1.50 Gram Weights. Of good quality; gram pieces of brass, heavily lac- quered, fractional pieces of German silver. In polished box. Sets, 10 milligrams to 10 20 50 100 200 grams Per set, Net •75 1. 00 1.25 1-75 Sets, 10 milligrams to 500 1000 2000 5000 2.25 grams Per set. Net 3-25 5.00 8.00 14.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 51 12380 12383 12378 12378. Gram Weights, Single. Same quality as weights in sets No. 12376. Milligrams i 2 5 10 20 50 100 200 500 Each, Net Grams .05 .05 I ■05 2 •05 .05 .05 10 .05 20 •05 •05 Each, Net Grams •05 SO •05 100 •05 200 •05 500 .10 1000 Each, Net .15 .15 .25 .60 12380. Gram Weights. Of brass; in walnut box. 1.25 Sets, 10 milligrams to 20 50 200 500 1000 grams Per set, Net .50 .75 i.oo 1.50 12382. Gram Weights. Of iron; for coarse weighing. Sets, 10 grams to 10 2.00 3.00 20 kilos. Per set, Net 1.25 2.00 3.50 5.00 7.00 52 Bausch Na^S Sn Clj Sn Zn Per ten $5.50 12794, Bottles, Reagent. Wide Mouth. Capacity 2000 cc. . Per ten $6.50 202 Potassium Cyanid K C N 203 Potassium Nitrate K N O3 204 Sodium Ammonium Phosphate 205 Sodium Carbonate Naz CO3 206 Sodium Chlorid Na CI 207 Sodium Nitrate Na NOs 208 Sulfur, Flowers .S 2og Tin, Gran. Sn 210 Zinc, Gran. Zn We will supply our new reagent bottles, singly, either narrow mouth or wide mouth, with special names not included in the list above, at the following prices per bottle: 30 cc, 65c.; 60 cc, 70 c; 125 cc, 75 c; 250 cc, 85 c; 500 cc, $1.00; 1000 cc, $1.25. If or- dered in quantities, price on application. 12796. Bottle Caps. Of glass; to fit over the stoppers of Reagent Bottles. Capacity of Bottles, cc. 30 60 125 250 500 1000 2000 193 Blank 194 Borax Na2 B4 O7 19s Boric Acid Hs BO3 196 Copper, Gran. Cu 197 Copper, sheet Cu 198 Phosphorous, Sticks P 199 Potassium Bisulfate K H S O4 200 Potassium Carbonate Kj C O3 201 Potassium Chlorate K CI O3 Per ten •75 •75 ^75 ^75 ^75 ^75 •75 12798. Bottle, Reagent Stock. A removable glass funnel is ground into the neck and serves as a pour-out. Fitted with glass cap ground on. Capacity, 500 cc. Each $0.60 94 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., laSoo 12802 12804 12806 12808 12810 1 281 2 1 281 4 12800. Bottles, Specific Gravity. With thermometer, graduated to 1/5°, ground into neck. Capacity, cc. 25 50 100 Each 2.50 2.60 2.75 12802. Bottles, Specific Gravity. With thermometer ground in; accurately adjusted; very light. Capacity, cc. 25 50 100 Each 1.50 1.7s 2.00 12804. Bottles, Specific Gravity, American Form. For liquids or solids. Each $4.00 12806. Bottles, Specific Gravity, Gay-Lussac's. With perforated stopper. Capacity, cc. 125 10 25 50 100 - Each .20 .20 .20 .20 .25 .35 .50 12808. Bottles, Specific Gravity, Gay-Lussac's. ilost accurately adjusted. Capacity, cc. 10 25 so 100 Each .55 .55 .55 .55 .60 .85 i.io 12810. Bottles, Specific Gravity, Gay-Lussac's. Same as No 12808. in tir. case with tare weight. Capacity, cc. 10 25 50 100 Each 1.50 1.60 2.40 New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. 95 12822 12824 12826 12820 I28i6 1 281 8 12812. 1 281 4. 1 281 6. 12818. 12820. 12822. 12824. 12826. Bottle, Specific Gravity, Hogarth's. For determining tlie specific gravity of iron ores in iron analysis. (Blair's Analysis, 3d edition, page 265.) Each $2.00 Bottle, Specific Gravity, Kohl's. With ground-in thermometer and capillary tube divided in millimeters. Each $3.00 Bottles, Specific Gravity, Regnault's. For liquids. Capacity, cc. 25 50 100 Each •45 •50 .65 Bottles, Specific Gravity, Regnault's. For solids. Capacity, cc. 25 50 Each .45 .50 Bottle, Specific Gravity, Schumann's. For- cement. Bottles, Specific Gravity, Sprengel's. With caps ground on. Each Bottles, Specific Gravity, Sprengel's. With normal thermometer. and ground-in suction tube. Each $3.50 Bottles, Specific Gravity, Squibb's. Capacity, cc. . 25 50 100 Each $2.25 $0.75 Each Bottles, Specimen. 1. 00 1.25 See Jars and Vials. 1.50 96 Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. A., 12828 12830 12834 12832 12838 12828. Bottles, Washing. For ether. With glass tubes and glass stopper ground in. Capacity, cc. 125 250 500 1000 Each .75 1. 00 1.25 1.50 12830. Bottles, Washing. For volatile liquids. With glass tubes, stop cocks, and glass stopper ground in. Capacity, cc. 125 250 500 looo Each 2.00 2.50 2.75 3.00 12832. Bottles, Washing. With glass tubes and rubber stopper. Capacity, cc. 125 250 375 500 750 1000 2000 Each .30 .40 .45 .50 .60 .75 1. 00 12834. Bottles, Washing, Faraday's. With rubber stopper and flexible de- livery tube. Capacity, cc. 125 250 375 500 750 1000 2000 Each .30 .40 .45 .50 .60 .75 1. 00 12836. Bottles, Washing. With rattan covered neck. Capacity, cc. 150 250 500 looc Each .65 .75 i.oo i.io 12838. Bottles, Washing. With valved rubber bulb. For washing with hot water, etc.; give continuous flow. Capacity, cc. 125 250 500 1000 Each .80 .go i.io 1.50 12840. Bottles, Washing, Fitted writh Handles. Any of the above washing bottles will be supplied with handles, on order. (See illustration, page 98.) Each $i.oo New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 97 1 2841 12842 12844 12848 12856 12840 12841. Bottles, Weighing. High form, with ground glass stopper. Very- light. Flat bottom. Height, mm. 60 80 100 120 Diameter, mm. 10 15 23 32 Each .18 .20 .25 .30 12842. Bottles, Weighing. Same as No. 12840 but with round bottom. Height, mm. 60 80 100 120 Diameter, mm. 10 15 23 32 Each .18 .20 .25 .30 12844. Bottles, Weighing. Low form, with ground" glass stopper. Flat bottom. Height, mm. 40 50 60 70 80 Diameter, mm. 25 30 30 35 45 Each .25 .30 .35 .40 .45 12846. Bottles, Weighing. Low form, with ground glass stopper. Bound bottom. Height, mm. 40 50 60 70 80 Diameter, mm. 25 30 30 35 45 Each .25 .30 .35 .40 .45 12848. Bottles, Weighing. Conical, with flat bottom and ground glass stopper. Capacity, cc. 15 30 60 Each .35 .40 .50 12850. Bottles, Weighing. Two tubes, one sliding into the other. Length 60 mm. (See illustration, page 99.) Per set $0.20 12852. Bottle Weighing Support, for bottle No. 12850; to be used either up- right or horizontal. (See illustration, page 99.) Each $1.50 12854. Bottles, Weighing, Grethen's. With ground-in pipette for weighing corrosive liquids. Capacity 2 cc. (,See page 99.) Each $2.00 12856. Bottles, Weighing, Lunge's. For weighing corrosive liquids. Each $3.50 98 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., i286o 12858. Bottles, Woulff. Capacity, cc. If _ 12850 12854 12858 Heavy glass; with two necks. 125 250 500 1000 2000 4000 8000 Each .40 .45 .50 .85 1.20 2.10 3.00 12860. Bottles, Woulff. Heavy glass; with three necks. Capacity, cc. 125 250 500 1000 2000 4000 8000 Each .45 .50 .60 .95 1.35 2.30 3.50 12862. Bottles, Woulff. Glass; with two necks, and tubulature near bottom. Capacity, cc. 500 1000 2000 4000 Each 12864. Bottles, Woulff. Glass bottom. Capacity, cc. 500 .80 i.oo 1.50 2.50 with three necks, and tubulature near 2000 4000 2-75 Each .go i.io 1.65 12866. Bottles, Woulff. Glass; with three necks, and two delivery tubes and glass stopper ground in. Capacity, cc. 125 250 500 1000 Each I.oo 1.25 1.60 2.00 12868. Bottles, Woulff. Of stoneware; any size to order. 12870. Boxes, Paste Board. So-called pill boxes. Made of heavy stock, covered with white glazed paper. (See illustration, page 100.) Diameter, mm. 30 35 40 50 60 70 Depth, mm. 10 12 14 16 22 28 Per hundred 1.40 1.60 1.75 1.85 2.00 2.10 12872. Boxes, Paste Board. Rectangular; covered with white glazed paper. Length, mm. 50 60 65 Width, mm. 30 35 40 Depth, mm. 18 20 22 Per hundred .45 .50 New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. •55 99 12870 12876 12880 12874 12878 12882 12874- Boxes, Glass. With glass covers. Capacity, cc. 15 30 60 125 250 500 Per ten .50 .65 .90 1.35 2.25 3.3s 12876. 12878. 12879a, Boxes, Glass. With nickel plated screw cap; without shoulder. Capacity, cc. 10 15 30 60 go 125 250 500 Per ten .35 .40 .55 .70 .85 i.oo 1.65 2.45 Box, Opal Glass. Oblong. Capacity, 25 cc. Per ten $1.05 Boxes, Slide. Of light wood with tight fitting cover; index on the inside; label on the outside with space for titles. Label is visible when box is in position to keep slides horizontal. For slides 3x1 inch. Capacity 12 25 slides Per ten .55 .65 12879b. Boxes, Slide. Made of white wood with a capacity of twenty-five slides. This is an improved form of No. 12879a, having a cover which fits over the top so that, when removed, each slide can be withdrawn easily. For slides 3x1 inch. Per ten $1.00 12880. Boxes, Tin. Seamless. Capacity, grams 5 10 15 30 60 125 250 Per hundred .50 .70 .80 12882. Boxes, Turned Wood. Capacity, grams S 10 15 30 1.60 2.50 4.00 60 I2S 250 12884. Per hundred .30 .36 .45 .55 .95 1.70 3.35 Bristol Board. Clear white; good erasing surface and weight. Size 330 X 400 mm. Per ten sheets $0.25 100 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., isgoS 12886 12888 12892 12896 12894 12902, 12904 12886. Brushes, Acid. Made of glass cemented in glass handle. Diameter, 6 mm. Each $0.25 12888. Brushes, Bristle. For assay buttons. Each $0.50 12890. Brushes, Bristle. With wooden handle. For cleaning small cylin- ders, etc. Each $0.15 12892. Brushes, Bristle. With wooden handle. For cleaning large cylinders. Number of rows 3 4 Each .25 .30 12894. Brushes, Bristle. With wooden handle. For cleaning small jars. Each $0.20 12896. Brushes, Bristle. With wooden handle. For cleaning large jars. Number of rows 346 Each .25 .30 .35 12898. Brushes, Bristle. Flat, for paste, etc. (See illustration, page 102.) Width, mm. 25 38 50 62 Each •05 .08 •15 12900. Brushes, Bristle. Round, for marking, etc. Length of bristles, mm. 15 17 19 21 Per ten .35 .38 .40 .45 12902. Brushes, Camel's Hair. Miniature size; bound in quill handle. Numbers 12345678 Length of hair, mm. 8 10 12 14 16 18 20 22 Per ten .40 .40 .55 .55 .80 .80 i.oo i.oo 12904. Brushes, Camel's Hair. Very fine pointed; bound with silk in swan quill handle. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. JOI I2918, 12922 12898 IB 1 29 1 6, 12920 Length of hair, mm. 18 25 12906. 12908. 12910. 12912. Per ten Brushes, Camel's Hair. Width, mm. 1.15 1.15 1.15 Flat, for dusting scale pans. 12 25 37 so Each .IS .25 45 -60 Brushes, Camel's Hair. Round, for dusting scale pans. Diameter, mm. 12 15 20 Each [35 ^85 ^75 Brushes, Red Sable. With wooden handle and metal ferrule. Numbers 01 234567 Per ten i.oo 1.25 1.50 1.7s 2.00 2.25 2.50 3.00 Brushes, Russian Sable. With wooden handle and metal ferrule. Numbers i 23456 12914. Per ten .60 .65 .70 ■75 .80 .90 Numbers 7 8 9 10 II 12 Per ten i.oo i.io 1.20 [.30 [.40 1.50 ushes, Scrubbing. Length, mm. 115 150 Width, mm. 40 75 12916. Brush, Test Tube. 12918. Brush, Test Tube. 12920. Brush, Test Tube. 12921. Brush, Test Tube. 12922. Brush, Test Tube. 12924. Brush ,Test Tube. 12926. Brush, Test Tube. $0.75 102 Each .10 .15 Dn brass wire; bristle, with bristle end. Per ten On brass wire; bristle, with sponge end. Per ten $0.85 On tinned iron wire; bristle, with bristle end. Per ten $0.55 On tinned iron wire; bristle. Per ten $0.25 On tinned iron wire; bristle, with sponge end. Per ten $0.65 Sponge, with rattan handle. Per ten $0.60 Sponge, with whalebone handle. Per ten $1.25 Bausch £r Lomb Optical Co., Rochester, N. Y., U. S. A., 12942 £60 12954 E fi 12946 12938 12936 12940 12928. Brush, Tube. For cleaning narrow tubes. wire. Brush, Tube. For cleaning burettes. Bristle, I meter long. Brush, Tube. On brass wire i meter long. Brushes, Tube. For cleaning cylinders, large Bristle, on brass wire. Length, mm, 250 300 375 12930. 12932. 12934. 12948 12950 Bristle, on tinned iron Per ten $0.10 on tinned iron Per ten Per ten tubes, bottles. wire $0.75 $1.20 etc. 500 Each .10 .13 .16 .20 12936. Buckets, Agateware. Agate nickel steel, seamless. Capacity (approx,) liters 8 12 Height, mm, 175 225 Diameter (top) mm. 240 290 Each 1.25 1.75 Bulb Tubes. See Tubes, Ignition, Bulb Tubes, Meyer's. See Sulphur Apparatus. Bulbs. See Rubber Bulbs, Burettes for General Laboratory Work. The following are intended for use in routine, laboratory work. They are adjusted by accurate measurement with water at 15° c, and are graduated with semi- circular markings for quick reading. We have adopted the semi-circular form of graduation as our stand- ard for burettes for routine laboratory work, and the circular form for instruments of precision. Both render the reading of markings more accurate than is possible in the short line graduations in com- mon use. Being made at our own works and under our own super- vision, we are assured of careful testing and can recommend these instruments as of superior quality. Burettes, Gas. See Gas Burettes, New York, Boston, Chicago, U, S. A, Frankfurt a/M,, Germany, TO'? J2938. Burettes, Mohr's. For pinch cock. (See illustration, page 103.) Capacity, cc. 5 10 10 23 25 50 Graduated, cc. i/io i/io 1/20 i/io 1/20 i/s Each .35 .40 .60 .65 .75 1. 00 Capacity, cc. 50 75 75 100 100 100 Graduated, cc. i/io 1/5 i/io 1/20 1/5 i/io Each 1.25 1.25 1.50 1.25 1.50 1.7s 12940. Burettes, Mohr's. For pinch cock; with side tube for re-filHng. Capacity, cc. 25 50 75 100 Graduated, cc. i/io i/io i/io i/s Each .75 1.25 1.60 1.75 12942. Burette Attachment. For use on burettes not having stop cocks. Consists of pinch cock, glass tip, and rubber tubing to connect with burette. (See illustration, page 103.) Size Small Medium Large Each .25 .25 .25 12944. Burette Tips. Of glass. Per ten $0.25 12946. Burette Attachment. To connect burette with reservoir for filling. Complete as illustrated. (See page 103.) Each $0.50 12948. Burettes, Mohr's. With Geissler's stop cock; straight. (See page 103.) Capacity, cc. 10 10 25 25 50 50 Graduated, cc. i/io 1/20 i/io 1/20 1/5 i/io Each Capacity, cc. Graduated, cc. 1. 00 75 1/5 I-I5 75 i/io 1. 25 100 1.50 100 I/s I -75 100 i/io Each 2.00 2.25 2.00 2.25 2.50 12950. Burettes, Mohr's. With Geissler's stop cock; bent. (See page 103.) Capacity, cc. 10 25 50 75 100 Graduated, cc. i/io i/io i/io i/io 1/5 Each 1. 00 1.25 1.85 2.25 2.25 12952. Burettes. With three-way stop cock. (See illustration, page 106.) Capacity, cc. 25 50 75 100 Graduated, cc. i/io i/io i/io -'-i/5~ '" Each 2.25 2.75 3.25 3.50 12954. Burettes, Bink's. On wooden base. (See illustration, page 103.) Capacity, cc. 10 25 50 100 Graduated, cc. i/io i/io i/io 1/5 Each .75 i.oo 1.25 2.00 12956. Burettes, Gay-Lussac's. On wooden base. (See page 105.) Capacity, cc. 10 25 50 100 Graduated, cc. i./io i/io i/io 1/5 Each .80 1.00 i.io 2.00 jQ J Bausch tS* Lomb Optical Co., Rochester, N. Y., U. S. A., w #^ 12958 12956 12968 12958. Burettes, Gawalowsky's. With side tube and stop cock to connect with reservoir for refilling. Capacity, cc. 25 50 75 100 Graduated, cc. i/io i/io i/io 1/5 Each 2.50 3-25 3-75 4.00 12960. Buiettes, Geissler's. With ground glass rod to serve as stop cock. Capacity, cc. 25 50 100 Graduated, cc. i/io i/io 1/5 Each 1.50 12961. Burettes, Schellbach's. With dark enameled stripe on white back- ground. For pinch-cock. (See illustration, page 106.) Capacity, cc. 25 50 75 100 Graduated, cc. i/io i/io i/io 1/5 Each 1.20 1.50 2.00 1.75 12962. Burett.es, Schellbach's. With Geissler's stop cock. Capacity, cc. 25 50 75 100 Graduated, cc. i/io i/io i/io 1/5 Each 2.00 2.50 3.00 3.00 12964. Burettes, Schellbach's. Having two sides white enameled, the re- maining surface being transparent. For pinch cock. Capacity, cc. 25 50 75 100 Graduated, cc. i/io l/lo i/io 1/5 Each 1.50 ^■iS New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 105 12970 12965. 12966. 12968. 12970. 12971. io6 12961 12974 12972 12960 Burettes, Shellbach's. Similar to No. 12964. With Geissler's stop cock. Capacity, cc. 25 50 75 100 Graduated, cc. i/io i/io i/io 1/5 Each 2.00 2.50 3.00 3.00 Burettes, Schellbach's. With three-way stop cock. Capacity, cc. 25 50 75 100 Graduated, cc. i/io i/io i/io i/s Each 2.25 3.00 3.7s 3.75 Burettes, Automatic Zero. The burette is filled by suction through the side tube at top of burette, or by pressure from rubber bulb attached to side tube near neck of reservoir, as illustrated. (See page 105.) When the burette is full any excess above the zero mark syphons back into the reservoir. Complete with reservoir and clamp. Burette graduated to i/io cc. Capacity, cc. 25 50 Each 4.50 5.00 Burettes. For dispensing liquids; with glass stop cock. Capacity, cc. 100 250 500 1000 2000 Graduated, cc. i s 10 25 50 Each 1.7s 2.50 3.00 3.75 5.00 Burettes. For dispensing liquids; with glass stop cock, bent. Capacity, cc. 100 250 500 1000 2000 Graduated, cc. i s 10 25 50 Each 1-75 2-5° 3-00 3.7s 5.00 Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. A., iag88 12994 12990 12978 12980 12992 12982 12972, 12974. 12976. Burette caps for No. 12970. Each .05, .10, .15, .20, .25 Burettes. After design of Dr. Edward S. Johnson. For quick meas- uring of reagents. Complete with 60 cc. burette, 4 liter bottle, stand, etc., as illustrated on page 106, including also rubber force pump and pinch-cock. Each $10.00 Burettes of 200 cc. capacity, graduated to 5 cc, one stop cock. For use with Dr. Johnson's Burette No. 12974. Each $3.00 Burettes for Laboratory Work of Precision. These burettes have circular (all round) markings for very accurate reading, and are graduated by weight on delicate balance. They are standardized to meet the requirements of the German Imperial Commission. A certificate of accuracy is supplied with each instrument. 12978. Burettes, Mohr's. With pinch-cock, rubber tubing and glass tip. Capacity, cc. 10 10 25 25 50 Graduated, cc. i/io 1/20 i/io 1/20 1/5 Each 1.05 1.45 1-55 I -75 2.25 New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. 107 I2gg6 13004 Capacity, cc. Graduated, cc. SO 75 75 100 100 100 i/io i/S i/io /2 1/5 i/io Each 2.75 2.75 3.25 2.75 3.25 3.7s 12980. Burettes, Mohr's. With Geissler's stop cock; straight. (See page 107.) Capacity, cc. 10 10 25 25 50 50 Graduated, cc. i/io 1/20 i/io 1/20 i/s i/io Each Capacity, cc. Graduated, cc. >0 2.30 2.50 3.00 3-50 75 75 100 100 100 /5 i/io y^ i/S i/io 3-70 Each 4.00 4.50 4.00 4.50 5.00 12982. Burettes, Mohr's. With Geissler's stop cock; bent. (See page 107.) Capacity, cc. 10 25 50 75 100 Graduated, cc. i/io i/io i/io i/io 1/5 Each 2.30 2.50 3.70 4.50 4.50 12984. Burettes. With three-way stop cock. (See page 107.) Capacity, cc. 10 25 50 75 100 Graduated, cc. i/io i/io i/io i/io 1/5 7.00 Each 4.00 4.50 5.50 6.25 We will also supply these burettes (on import orders only and at higher prices) tested by the German Imperial Commission whose indorsement of accuracy is stamped upon each instrument. Prices on application. 12986. Burette Caps. Of glass, for any burette. Per ten Burette Clamps. See Clamps. Burrette Floats. Materially increase the accuracy of reading bu- rettes. In ordering, give inside diameter of burette. $0.50 12988. Burette Floats, Erdmann's. Plain form. Each $0.25 12990. Burette Floats, Vollhard's. With glass points to prevent adhering to walls of burette. (See illustration, page 107.) Each $0.40 108 B^usch fy Lomb Optical Co., Rochester, N. Y., U. S. A., 13008 13006 I30I0 12992. Burette Floats, Beutel's. (See page 107.) Each $0.35 12994. Burette Floats, Schulze's. With thermometer. (See page 107.) Each $0.75 Burette Stands or Holders. See Supports. 12996. Burners, Argand. Low form with lava tip and iron chimney. The flame is adjustable and can be turned down very low. Arranged for artificial gas. (See illustration, page 108.) Each $1.00 12998. Burners, Argand. Arranged for natural gas. Each $1.00 13000. Clay Chimneys for above. Each $0.25 13002. Burners, Argand, Erlenmeyer's. Latest form, with improved air reg- ulator. Supplied with star support and clay and iron chimneys. (See illustration, page 108.) Each $4.00 13004. Burner, Barthel's Alcohol. This burner produces a smokeless, blue flame of great intensity. Requires no wick, cannot explode, and is easily regulated. Complete with reservoir and lyi meters of flex- New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 109 I30I8 13024 ibie metallic tubing. The small size is equal to two, and the large size four, Bunsen burners. (See illustration, page 108.) Sizes ' Small Large Each, Net 7.50 9.00 13006. Burner, Barthel's Gasoline. Requires no wick and is absolutely safe. Produces a noiseless flame of high temperature. Will bring n liter of water at IS°C to boil in about six minutes. Capacity of reservoir sufficient for two hours at full flame. Each, Net $4.00 13008. Burner, Barthel's Gasoline. A non-explosive burner capable of varia- tion from a very small flame to a powerful blast of 2000° C. A variety of flame in size and shape may be produced by means of interchangeable tubes. (See illustration, page 109.) Each, Net $6.75 Burners, Blast. See Blast Lamps. 13010. Burner, Boyce's Acme. For coal or gasoline gas. Each $1.50 13012. Burner, Boyce's Adjustable. For coal or gasoline gas, with separate regulators for gas and air supplies. Each $1.00 13013. Burner, Bunsen's. For acetylene gas. Each $1.35 13014. Burner, Bunsen's. With air regulator. Each $0.25 13016. Burner, Bunsen's. With tube 12 mm. diameter, giving flame twice the size of No. 13014. Each $0.40 13018. Burner, Bunsen's. Low form, with air regulator. Each $0.50 13020. Burner, Bunsen's. With mica chimney. Each $1.00 13022. Burner, Bunsen's. Improved form in which the air enters at the lower end of the tube instead of at the side and is thoroughly mixed with the gas, produ.cing complete combustion. . Each $0.35 13024. Burner, Bunsen's. Improved low form. Made on same principle as No. 13022. Each $0.75 110 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 13028, 13030 13032 13040 13044 13034 13038 13036 13026. Burner, Bunsen's. Style No. 13024. With mica chimney. Each $1.25 13028. Burner, Bunsen's. With crown top; so-called small locomotive burner. Each $0.60 13030. Burner, Bunsen's. With crown top; so-called large Icicomotive burner. Height, 175 mm.; diameter of tube, 18 mm.; crown top, 38 mm. diameter. Each $3.00 13032. Burner, Bunsen's. With fork to attach to stand, and support for chimney. Each $1.65 13034. Burner, Bunsen's Adjustable. For burning gases of various quali- ties. A desirable burner for gasoline gas. Each $1.25 13036. Burner, Bunsen's Combination. For gasoline gas. Each $1.25 13038. Burner, Bunsen's, Fletcher's Safety. Of brass, with gauze top to prevent lighting back. The gauze is easily replaced if accidentally destroyed. Complete with base. Each $2.15 13039. Burner, Bunsen's, Fletcher's Safety. Without base. Each $1.20 13040. Burner, Bunsen's Micro. A very small flame can be obtained with this burner. Nickel plated; height, 60 mm. Without mica chim- ney. Each $0.50 13042. Biumer, Biuisen's Micro. With mica chimney. Each $1.00 13044. Burner, Bunsen's Micro. With stop cock and glass chimney. Height, i6s mm. Each $2.00 New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. x j j 13054, 13056 13058, i3o6o 13046. 13048. 13050. 13052- 13054- 13056. 13058. 13060. 13062. 13064. 13066. 13068. Burners, Bunsen's Multiple Tubed. Two tubes. Each $1.30 Burners, Bunsen's Multiple Tubed. Three tubes. Each $1.75 Burners, Bunsen's Multiple Tubed. Four tubes. Each $2.00 Burners, Bunsen's Multiple Tubed. Six tubes. Each $3.00 Burners, Bunsen's Multiple Tubed. Three tubes in line. Each $1.75 Burners, Bunsen's Multiple Tubed. Four tubes in line. Each $2.00 Burners, Bunsen's Multiple Tubed. Three tubes in line, with stop cocks. Each $3-75 Burners, Bunsen's Multiple Tubed. Four tubes in line, with stop cocks. Each $4-50 Burners, Bunsen's Multiple Tubed. For heating large surfaces. On adjustable support and with or without stop cocks. These burners will be supplied with mica chimneys at an additional cost. Burners, Bunsen's Multiple Tubed. Two flames in line. Each $2.50 Burners, Bunsen's Multiple Tubed. Two flames in line, with stop cocks. (See illustration, page 113.) Each $5.00 Burners, Bunsen's Multiple Tubed. Four' flames in square. (See il- lustration, page 113.) Each $3.75 Burners, Bunsen's Multiple Tubed. Four flames in square, with stop- cocks. (See illustration, page 113.) Each $7.00 112 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 13074 13070. 13064, 13068 13076 13072. 13074- 13076. Burner, Bunsen's Patent Triplex. Consists of a large safety Bunsen, an illuminating burner, and a pilot flame controlled by an auto- matic valve. The pilot flame has separate valve and is useful for blow-piping. Each $3.00 Burner, Bunsen's, with pilot flame. Each $2.25 Burners, Bunsen's Ring Form. To be used on apparatus support for heating funnels, flasks, etc. With air regulator. Diameter of ring, mm. 75 100 125 150 Each 1. 25 1.50 1.7s 2.00 Burners, Bunsen's Ring Form. With stop cock and air regulator. 7S 100 125 ISO Diameter of ring, mm. Each 2.00 2.25 2.50 2.75 13078. Burner, Chaddock's Non-corrodible. This burner will be appreciated by every chemist who has used metal burners in hoods. It is in- corrodible, the gas exit being of glass and the rest of porcelain and white fire clay. It consists of three sections serving for various laboratory requirements and is supplied with flame spreader, asbes- tos disc, and asbestos rings. The small chimney is for platinum triangles. On account of not containing any metal parts it is to be highly recommended for poison analysis. Each $2.00 13080. Burner, Laboratory. This burner is simple in construction and prac- tically indestructible. Burns either artificial or natural gas, and though low in price is useful for a variety of purposes. Height, 70 mm.; dfiameter, 135 ram, (See illustration, page 1 14.) Each $0.20 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 1'3 13082 13084, 13086 13080 13078 13088 13082. Burner, Concentric. This is a very satisfactory burner at a low price, making it desirable where a large number of burners are to be used. Height, 80 mm,; diameter, 150 mm. Each $0.50 13084. Burners, Fletcher's Evaporating. For glass and porcelain vessels, and general laboratory work. Made of solid copper, with lap joints (without solder). This burner is a great improvement on the or- dinary coil burner in use, owing to the fact that currents of cold air, which are so fatal to glass and porcelain dishes, cannot reach the vessel. It is the safest burner known for heating flasks, giving a flat flame of any power, which cannot touch the flask. The total height for the different diameters is about 38 mm. Diameter, mm. 100 125 160 190 230 270 300 Each 1.80 2.10 2.70 3.60 4.20 4.80 6.00 13086. Burners, Fletcher's Evaporating. Same construction as No. 13084, but made of cast iron which for some purposes is more durable than copper. Diameter, mm. 100 125 160 Each 1.20 1.50 2.40 13088. Burner, Fletcher's Laboratory. Complete with sand bath, 225 mm. diameter and 25 mm. deep. Each $6.10 II A Bauscli &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 13098 I3I02 13108 13090. Burner, Fletcher's Low and High Temperature. By lighting the ring burner a steady current of warm or hot air passes up through the gauze and serves for drying or evaporating purposes. For boil- ing, etc., the gas is lighted above the gauze, vifhich with the blast from below produces a hot flame. (See page 114.) Each $2.40 13092. Burner, Fletcher's Radial. Will boil 2000 cc. of water in twelve min- utes. Very strong, being made in one casting. Each $1.20 13094. Burner, Fletcher's Radial. Made of annealed cast iron and very strong. Works equally well with coal, water or air gas, producing a practically solid flame which does not run to a point in the center. Diameter of burner ring, mm. 90 125 Each 1.80 2.40 13096. Burner, Fletcher's SoUd Flame. Large size; for large pans and quick boiling. Each $2.00 13098. Burners, Fletcher's Star. With support for vessels. The flame is- sues radially from the support, thus equalizing the heat over a large surface. Diameter, mm. 40 75 90 Each .85 .95 1. 10 New York, Boston, Chicago, U. S. A. Frankfurt a/M., Germany. y j r I3I04, I3I06 I3II4 I3I00. Burner, Friedburg's Safety. For coal or gasoline gas. The air en- ters the top of the chamber surrounding the burner tube and is heated before mixing with the gas, thus producing a hot flame with small amount of gas. Cannot light back. The air supply is regu- lated by telescoping the tubes. (See page 115.) Each $1.00 13102. Burner, Friedburg's Safety. Same construction as No. 13100 but with joint for inclination. Each $1.00 13104. Burner, Gasoline, Dangler's. A powerful burner with which, under ordinary pressure, a temperature of iioo°F. can be obtained, and much higher if desired. With tin reservoir. Each $7.00 13106. Burner. Gasoline, Dangler's. Same as No. 13104, but with copper reservoir. Each $8.00 13108. Burner, Gasoline, Kellogg's. Requires no wick and produces as much heat as several Bunsen burners. Is odorless, and is an excellent burner where gas is not available. Complete as per illustration. (See page 115.) Each $14.00 13112. Burner, Gasoline, Kellogg's. Lamp only. Each $3.60 13112. Burner, Gasoline, Kellogg's. Pain burner only. Each $3.60 131 13. Burner, Tyrell's. For gasoline gas. Each $1.25 13114. Burner, Hot Plate. With two radial burners, 95 mm. diameter, con- trolled by separate stop cocks. Size of plate, 290x475 mm. Each $6.00 13116. Burners, Hot Plate. With polished steel top. Extra heavy. Length, mm. 360 460 610 765 915 1220 1220 Width, mm. 180 360 460 460 460 460 610 Each 7.25 12.00 17.00 22.00 27.00 43.00 60.00 116 Bausch & Lonib Optical Co., Rochester, N. Y., U. S. A., 131 18. Burner, Hot Plate. As designed by Dr. Edward S. Johnson. Rigid, compact, and readily controlled. Consists of twelve lava-tip Ar- gand burners with clay chimneys regulated by separate stop cocks conveniently arranged on one pipe in front. The vessels to be' heated are supported on an asbestos pad rimmed with copper. Height, 225 mm., top, 450x625 mm. Each $40.00 Burners, Hot Plate. Other forms, see Sand B.\ths. 13120. Burners, Illuminating. Height, 300 mm. (See page 118.) Each $1 .00 Burners, Illuminating. Other forms, see Lamps. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 117 <5i 13120 13122 13122. 13124- 13124- 13124- 13130- 13132- 13134- 13136- 13134 Burner, Instantaneous Water Heater. When connected with cold water supply, will deliver hot water in three seconds after lighting. By properly regulating the gas and water supplies, boiling, hot, or warm temperature may be maintained. The water attachment is removable, leaving the burner for other purposes. Each $6.00 Burners, Instantaneous Water Heater. Give instantly a continuous flow of water at any temperature from lukewarm to boiling. The small size will heat 500 cc. of water per minute from 50° to I30°F. or will boil 15 liters per hour. The large size has double this capacity. The gas supply should be from a 10 mm. pipe. It works equally well, but at a proportionately slower rate, with any gas supply, however small. A recent improvement is the addition of a pilot light attachment which keeps the water in the coil con- stantly warm and automatically lights the burner when the gas is turned on; also a coupled gas and water tap operated by a hand wheel, a turn of which lights the burner and gives an immediate flow of warm water. (See illustration, page 117.) Sizes Small Large Each $13.20 $18.00 Each $15.60 $20.40 Each $22.80 $28.80 Burners, Instantaneous Water Heater. Heater without taps. Burners, Instantaneous Water Heater. Heater with gas taps and pilot light. Burners, Instantaneous Water Heater. Heater with coupled taps and polit light. Burners, Koch's Safety. For shutting off the flow of gas when the flame goes out by reason of low gas pressure, draughts, or other cause. An invaluable burner for apparatus that is to be left with- out constant attention. (See also illustration, page 119:) Small size, with support. Each $4.50 Medium size, with support. Each $5.00 Large size, with adjustable support. Each $10.00 Large size, with two burners and adjust- Each $13.50 Burners, Koch's Safety. Burners, Koch's Safety. Burners, Koch's Safety. Burners, Koch's Safety. able support. 118 Bausch o.75 Chlorid Calcium Tubes. With one bulb; straight. Length, mm. 100 125 150 200 250 Each .08 .09 .10 .12 .18 Chlorid Calcium Tubes. Bent. Length, mm. 100 125 150 200 250 Each .08 .og .10 .12 .18 Cl^orid Calcium Tubes. With two b Length, mm. 100 125 ulbs straight. 150 200 Each .09 .10 .12 .18 Chlorid Calcium Tubes. Bent. Length, mm. 100 125 150 200 Each .og .10 .12 .18 Chlorid Calcium Tubes. With two bulbs, and inner tube to collect moisture. Length, mm. 100 125 150 200 Each .12 .15 .18 .20 Chlorid Calcium Tubes. With ground-in outlet tubes. Length, mm. 100 125 150 Each .40 •50 •65 128 Bausch 6- Lomb Optical Co., Rochester, N. Y., U. S. A., 13264 13266 13268 13270 13272 13274 13276 13278 13266. 13268. 13270. Chlorid Calcium Tubes, Marchand's. Length, mm. 100 120 ISO Each .20 .25 .30 Chlorid Calcium Tubes, Schwartz'. With side tubes and perforated glass stoppers. Length, mm. 100 120 150 180 200 Each .65 .75 .90 1. 00 1.25 Chlorid Calcium Tubes. U-shaped. Length, mm. 75 100 125 150 175 200 250 300 •35 -40 13272. Each .12 .14 .16 .18 .20 .25 Chlorid Calcium Tubes. U-shaped; with glass rod. Length, mm. 100 125 150 Each .25 .28 .30 13274. Chlorid Calcium Tubes. U-shaped; with two side tubes. Length, mm. 100 120 150 180 200 13276. 13278. Each .14 .18 .20 .25 .30 Chlorid Calcium Tubes, Vollhard's. With two side tubes and bulb. Length, mm. 125 150 200 Each .25 .30 .45 Chlorid Calcium Tubes, Woehler's. With three bulbs. Length, mm. 100 125 150 180 200 Each .25 .30 .40 .55 .70 13280. Chopper, Meat. For mincing substances in making culture media. All parts are well tinned and can be readily taken apart for cleaning. (See illustration, page 130.) Weight, kilos. '346 Each, Net 1.50 2.00 3.00 4.50 13282. Clamp, Apparatus, Ostwald's Universal. Takes tubes of all sizes from I to SO mm. diameter. JIade of brass. (See page 130.) Each $1.25 New York, Boston, Chicago, U. S. .\., Frankfurt a/M., Germany. 129 13296 13282 13284. Clamp, Apparatus, Universal. For holding rods vertical or horizontal. Each $0.50 13286. Clamp, Apparatus, Universal. The jaws adjust themselves to irreg- ular shaped apparatus. Each $1.00 13288. Clamp, Burette. For one burette. Each $0.55 13290. Clamp, Burette. Double, for two burettes. Each $0.85 13292. Clamp, Burette. Adjustable by check-nut to any angle. An excel- lent clamp for general use. Each $0.45 13294. Clamp, Burette. Nickeled; with rubber-covered jaws, and screw for attachment to apparatus stand. Each $0.50 13296. Clamp, Burette. With cork-lined jaws. Each $0.65 13298. Clamp, Burette. With rubber rings; closes automatically; double form. (See illustration, page 131.) Each $3.00 13300. Clamp, Burette. For holding burettes or tubes at any angle; with cork-lined jaws. (See illustration, page 131.) Each $0.75 130 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 13298 13304 13302. I3304. 13306. 13308. I33IO. Clamp, Burette, Allihn's Automatic. For two burettes. Each $3.00 Clamp, Burette, Hoffman's. For two burettes. Each $0.75 Clamp, Burette, Lunge's. For supporting two tubes parallel. Each $1.50 Clamps, Chaddock's. Made of spring wire, japanned; with rubber- covered jaws for beakers. Sizes Small Large Each .25 ■25 Clamps, Chaddock's. For dishes. Sizes Small Medium Large $0.15 Each ,25 .25 .25 13312. Clamps, Chaddock's. For flasks or test tubes; with rubber-covered jaws. Each $0.25 13314. Clamp, Test Tube. Of wood. Each 13316. Clamps, Test Tube, Stoddard's. Of brass. Sizes Small Large Each .15 .20 13318. Clamps, Test Tube, Stoddard's. Of nickeled spring wire. Sizes Small Large Each .15 New York, Boston, Chicago, U. .S. A., Frankfurt a/M., Germany. 131 ' illllilllllllllllllliii,^ 13320 13322 13324 13326 13328 13330 13332 13334 13336 13320. 13322. 13324- 13326. 13328. 13330. 13332. 13334- 13335. 13338. Clamps, Tubing. Nickelplated; for rubber tubing. Size of opening, mm. S 8 Each .30 .50 Clamp, Tubing, Bunsen's. For rubber tubing. Made of brass, nickel plated. Size 18 x 38mm. Each $0.35 Clamps, Tubing, Hoffman's. For rubber tubing; nickel plated. Sizes Small Large Each •25 Clamps, Tubing, Hoffman's. Improved form. Can be attached to tubing without disconnecting apparatus. Sizes Small Large Each •25 Clamps, Tubing, Hoffman's. Improved form. Can be attached to tubing without disconnecting apparatus. Sizes Small Large Each ■ .25 .30 Clamp, Tubing. (Lever Screw Compressor). For rubber tubing; nickel plated. Size, 12mm. Each $0.30 Clamps, Tubing, Mohr's Pinch Cock. Of spring wire. Sizes Small Medium Large Each .10 .12 .15 Clamps, Tubing, Mohr's Pinch Cock. With device for holding clamp open. Sizes Small Medium Large Each .25 .25 .35 Clamp, Tubing, Scheibler's Pinch Cock. Of spring wire. Each $0.15 Clamps, Watch Glass. Of brass, nickel plated. Sizes Small Large Each •IS 132 Bausch Sf Lomb Optical Co., Rochester, N. Y., U. S. A., 13342, 13344 13352 13356 I3340. 13342. 13344- 13346. 13348. Clamps, Watch Glass. With two watch glasses ground tight. Diameter of glasses, mm. 50 65 Per set .30 .40 Clamps, Watch Glass, Bunsen's. Diameter, mm. 50 65 Each Clamps, Watch Glass, Bunsen's. Diameter, mm. With two watch glasses. 50 65 Clamps, Sizes, mm Per set .30 .40 Of iron; for fastening apparatus to table. 50 75 125 ISO 175 200 Each .16 •25 -35 -45 -SO .65 .75 Clamp Holders. For attaching clamps, extension rings, ring burn- ers, etc., to apparatus support. Sizes Small Large Each .20 .25 13350. Clamp Holder, Universal. To set at any angle. Cobalt Bottles. See Bottles. Cobalt Glass. See Glass Plates, Blue. 13352. Colanders. Of porcelain; with two handles. Each $0.50 Diameter, mm. 140 170 235 Each .85 1.20 1.75 2.10 13354. Colanders. Of porcelain; with flat bottom. Diameter, mm. 150 250 Each i.oo 1.75 13356. Colander. Of porcelain; with handle. Diameter, 160 mm.; height, not including handle, 150 mm. Each $2.25 13358. Colander. Of stoneware; with handle. Each $1.50 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 133 jMjgE^j^j^ffipjqpmwmiBi^iniMi,— ^ 13364 13360 13360. 13362. 13364- Colorimetric, Determination Apparatus. Carbon Filter Tubes. Length, 75 mm. 20 25 30 35 Diameter, mm. 40 Each •IS .20 •25 •30 ^o 13366. 13368. 13370. 13372- Carbon Tubes. Not graduated; in sets of twelve to agree. Size, 150x16 mm. Per set $1.25 Per set $1.25 Carbon Tubes. For Eggertz' color test. For the estimation of car- bon in steel. The quality of these tubes is not to be compared with those usually ofifered on the market. The tubes of each set bear corresponding numbers so that they may be readily kept together. Capacity, cc. 10 25 30 50 50 75 lor Graduated, cc. i/io i/io i/io i/io 1/5 1/5 1/5 In sets of two In sets of four 1-35 2.70 2.00 4.00 2.40 4.80 3-00 6.00 2.50 500 3-25 6.50 4.0U 8.00 Carbon Tubes. With bent end. Capacity, 100 cc. ; graduated in cubic centimeters, from 15 to 100 cc. Per pair $3.25 Carbon Tubes. Test tube form. Graduated in i/io cc. Capacity, cc. 5 10 15 20 25 Each .30 .35 .40 .45 .50 Carbon Tube Support. Of wood; for twelve tubes. Each $1.50 Color Comparator, Hehner's. Two cylinders of the same size and graduations, with stop cocks. With brass base. Each $7.50 13374- Color Comparator, Hehner's. Without brass ba-e. Each $4.00 134 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 13396 13378 I3376' Color Comparator, Leed's. With prism and one dozen, tubes. Each $15.00 13378. Color Comparator^ StEinner's. Of the latest construction; for deter- mining the color of sugar solutions. Each $72.00 13380. Cover Glasses for observation tubes of above instrument, optically inactive. Each $0.15 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. I'lC iSS^z- Rubber Washers for observation tubes of above instrument. Per ten $0.30 13384. Color Comparator, Stoke's. Complete. Each $15.00 (Described in Blair's Analysis, 3d edition, page 173.) Illustrated on page 135. Each $6.00 13386. Color Comparator or Camera. For reading carbon color tubes. 13388. Dissolving Tubes. With ground label near top for recording the number of the sample. Length, mm. 150 180 200 225 Diameter, mm. 16 20 25 18 Per ten .40 .50 .65 .65 13390. Nessler Tubes. For determination of ammonia in water. Graduated, cc. 50 100 50 and 100 50, 100 and 150 Each .35 .40 .55 .65 13392. Nessler Tubes, Tall Form. With fire polished bottom. Length, mm. 300 37s 375 450 Graduated, cc. 50 100 50 and 100 50, 100 and 150 Each .40 .50 .60 .75 13394. Nessler Tubes, Tall Form. With bottom ground and polished. Length, mm. 300 375 375 45° Graduated, cc. 50 100 50 and 100 50, 100 and 150 Each .45 .60 .70 .93 Nessles Tubes 13392 and 13394 will be selected in sets 2, 4 or 6. Water Baths. See Water Baths. 13396. Combustion Apparatus, Shimer's. For the determination of carbon in iron, steel, etc. Indispensable where a large number of carbon determinations have to be made, and equally useful for determin- ing combined water in ores, minerals, cements, etc., as well as carbonic acid, and for general ignition work in atmospheres of hydrogen, nitrogen or other gases. Consists of a special platinum crucible with copper stopper and rubber band seal, provision being made for circulation of water and the transmission of air or oxygen and the products of combustion. (See illustration, page 135.) Copper jackets for above, 30 cc. Each, Net $10.00 60 cc. Each, Net $12.00 Platinum parts quoted on application. 13398. Combustion Boats, Imperial Berlin Porcelain. Length, mm. 50 61 12 90 91 115 13S Width, mm. 13 10 11 18 21 13 25 Each .20 .20 .25 .25 .25 .25 .25 Combustion Boats of Platinum. See Platinum Ware. [3400. Combustion Boats, Royal Meissen Porcelain. Length, mm. 60 70 70 90 115 145 Width, ram. 10 11 15 18 13 14 Each .25 .25 .25 .30 .30 .35 J .7^ Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 13402 -^/-»?-&-fe-fe-g--^^ f ^SSSSS^^A^ " 1 3401 13401. Combustion Furnace, Benzine. This furnace is made of the best ma- terials throughout and is absolutely safe. It has 10 burners, each controlled by stop cock, and produces sufficient temperature for any work required. The tank is placed far enough from the burn- ers t.T prevent heating and is provided with pressure pump and manometer. A separate stop cock in the connecting tube shuts off instantly the flow of benzine to the burners. Each, Net $63.00 13402. Combustion Furnace, Bunsen's. Latest and most improved form; each burner is provided with separate stop cock. Complete with extra tiles and clay and iron slides. Number of burners* 10 15 20 25 Each 17.50 23.50 29.50 36.00 Combustion Furnace, Fletcher's. For gasoline gas or coal gas. This furnace, using with it foot blower No. 12590B, will heat an iron tube 18 to 25 mm. diameter to the softening point in ten minutes; or it will heat the same tube to redness without a blast, the burner being applicable for either draft or blast. (See page 138.) Length of furnace, mm. 300 13404. For draft and blast; with adjustable flame length. Each $14.40 $ig.2o $24.00 13406. For draft and'blast; without adjustable flame length. Each $12.00 13408. Without blast; with fixed flame length. Each $9.60 13410. Fire-clay casing blocks, 150 mm. long. 450 $15-60 $13.20 Each 600 $20.40 $16.80 $0.60 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 137 13404. 13406. 13408 1 341 2, 1 341 4, 1 341 6 13412. Combustion Furnace, Fletcher's New Pattern. Made entirely of brass, there being no iron work to rust. The burners are on the outside and in front of the furnace, clear from falling dirt. The furnace body is in 150 mm. sections and can be made up to any length without any obstruction. The burners can be made any length and any part of them used; the blocks and covers are sold separately, and the burners can be supplied in sections of 300 or 600 mm., so that any number can be used in a line without a break, enabling the furnace to be built up to any length desired. If a fixed length is required, any number of sections can be secured permanently together. In use, it is free from odor. Length, mm. 300 600 Each 31.20 60.00 13414. Extra Covers for above furnace. Each $0.60 13415. Extra sections, of body, 150 mm. Each $5.70 138 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., I34I8 13420 I34i8- Combustion Furnace, Fuch's Latest Pattern. This furnace is easily regulated and consumes only a small amount of gas, considering the work done. It prevents the combustion tube from cracking or getting out of shape. Each $90.00 13420. Combustion Furnace, Glazer's. Modified by Anschetz and Kekule. With mica plates to permit watching the flame during combustion. The burners are movable and are provided with spring stop cocks ard nickel plated air regulators. Complete with top plates of clay. Number of burners 10 16 21 26 Each 30.00 40.00 50.00 60.00 13422. Combustion Furnace, Lothar-Meyer's. For tubes, ilade of iron, asbestos coated. Has adjustable burners, and iron shutters. Length of tubes, 625 mm., diameter, 30 mm. (See page 140.) Number of tubes 4 8 Each 38.00 41.00 13424. Combustion Furnace, Lothar-Meyer's. Takes tubes of various di- mensions, and for combustions below a cherry heat. Length, mm. 500 600 800 Each Combustion Spoons. 26.00 29.00 32.00 See Defl.\gration Spoons. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 139 13426 134^2 13430 13438 13424 13434 13426. Combustion Tubes. Of hard Bohemian glass, drawn to a point. Length, mm. 300 400 600 800 Each .18 •25 -40 -45 13428. Combustion Tubes, Imperial Berlin Porcelain. Glazed inside and outside; 600 mm. long. Diameter, mm. 15 20 25 30 Each 1.80 2.30 2.50 3.25 13430. Combustion Tubes, Imperial Berlin Porcelain. Flanged; glazed in- side; about 12 to 20 mm. inside diameter. Length, mm. 300 450 "500 600 750 Each .60 1.35 i.6o 2.10 2.80 140 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., \/ 13436 13440 13442 1 13444 13446 13432. Combustion Tubes, Royal Berlin Porcelain. Glazed inside and out- side; 600 mm. long. Diameter, mm. 10 14 19 5.00 28 6.7s 3-5° 4-25 See Glass Tubing. See COLORIMETRIC DETERMINATION ApPA- Each Combustion Tubing. Comparison Tubes. RATUS. 13434. Condenser. Of glass, .with receiver of 300 cc. capacity blown on. Length, 400 mm. (See illustration, page 140.) Each $2.00 13436. Condensers, AUihn's. Of glass, with bulb condensing tube. Length, mm. 200 300 400 Each 1. 00 1. 25 1.50 13438. Condenser, Hopkins'. After design by Prof. C. G. Hopkins. Made en- tirely of glass, and consists of a thin glass water tube, 25 mm. out- side diameter and 250 mm. long, provided with inlet and outlet tubes, the former reaching to near the bottom of the water tube. The water tube is sealed into a stronger outer tube having side neck and its lower end ground to point. In use the outer tube ia not cooled to a temperature at which atmospheric moisture will condense upon it, wherein lies the chief advantage of this condenser over ordinary forms in fat extraction with anhydrous ether. May also be used for ordinary distillation by passing the vapor through the side tube. Total length, 350 mm. (See page 140.) Each $1.50 13440. Condensers, Liebig's. Of highly polished brass, with condensing tube of glass. Rubber stoppers included. Length, mm. 300 375 500 600 ' 675 750 1000 Each 2.50 3.00 3.2s 3.7s 4.00 4.50 5.50 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 141 13454 ■i u 13450 13458 13456 13442. Condensers, Liebig's. Of glass, with condensing tube in form of coil sealed in water jacket. Length, mm. 150 200 250 300 400 Each 1. 00 1.35 1.65 2.00 2.50 13444. Condensers, Liebig's. Of glass, with loose inner tube. Length, mm. 300 400 500 600 800 1000 Each .65 .75 .90 1. 15 1.60 2.00 13446. Condensers, Liebig's. With rubber connections. (See page 141.) Length, mm. 300 400 500 600 800 1000 Each .75 i.oo 1. 10 1.35 1.75 2.40 13448. Condensers, Liebig's. With rubber stoppers. Length, mm. 300 400 500 600 800 1000 Each 1.75 2.20 2.60 2.90 3.65 4.3s Condenser Tubes for above Condensers. See No. 13474. 13450. Condensers, Liebig's. Of glass, with inner tube sealed to body. Length, mm. 300 400 500 600 800 1000 Each .80 I.oo 1. 15 1.40 2.40 142 Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. .\.. 13460 13462 13474 13466 13468 13470 13472 13464 13452- Condenser, Soxhlet's. Globe shape; of copper, tinned inside. (See illustration, page 142.) Each $2.70 13454. Condenser, Soxhlet's. Of glass throughout. Each $3.50 13456. Condenser, Soxhlet's. Of glass throughout; for inside and outside cooling. Each $4.50 13458. Condensers, Spiral. With glass spiral; on tripod. (See page 142.) Capacity, cc. 500 1000 2000 Height, mm. 250 250 300 Diameter, mm. 40 65 80 Each 3.10 4.00 4.50 13460. Condenser, Sulphurous Acid. With three stop cocks and extra res- ervoir. Each $2.50 13462. Condenser, Sulphurous Acid. With two bulbs and three stop cocks in a line. Each $2.50 13464. Condenser, Sulphurous Acid, Goebel's. With one stop cock and with exit tubes. Each $1.00 13466. Condenser, Sulphurous Acid, Liebig's. With two stop cocks on hor- izontal tubes. Each $1.80 13468. Condenser, Sulphurous Acid, Meyer's. With two stop cocks on ver- tical tubes. Each $1.80 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 143 13496 13494 ofi n- i 3 13470. 13472- 13474- 13476- 13478. 13480- 13480 Condenser, Woehler's. For ore determination; with hollow glass stoppers ground in. Each $2.50 Condenser. Of zinc; with heavy block-tin worm. (See page 143.) Capacity of still, liters 2 4 S 12 20 Each 2.25 3.25 4.00 4.7s 6.00 Condenser Supports. See Supports. Condenser Tubes. Of glass; for condensers. (See page 143.) Length, mm. 300 400 500 600 800 1000 Each .18 .20 .25 .30 .40 .60 Connecting Tubes. See Tubes. Cork. First Quality. For lining cabinets, etc. In sheets 100 x 300 mm. and S mm. thick. Cork. Second Quality. Corks. Regular Length; XX Quality. Numbers 00 o i 2 3 Diam., top, m-m. 8 9 10 11 12 Per ten sheets $1.25 Per ten sheets $0.60 4 5678 9 10 14 16 18 20 22 24 26 13482. 13484- Per hundred .12 .12 .12 .12 .14 .16 .21 .23 .30 .40 •45 58 Numbers II 12 13 14 IS 16 17 18 20 22 24 20 Diam., top., mm. 28 29 30 31 32 34 '36 38 40 43 46 50 Per hundred .60 .66 .75 .82 .go I .20 1.35 1.44 1 .80 2.25 2.85 3.40 Corks. Short Form. XX Quality. Numbers 00 I 2 3 456 7 8 9 10 Diam., top, mm. 8 9 10 II 12 14 16 18 20 22 24 26 Per hundred .12 .12 ^12 .12 .12 .12 .14 .17 -25 .28 .32 .48 Numbers II 12 13 14 IS 16 17 18 20 22 24 26 Diam., top, mm. 28 29 30 31 32 34 36 38 40 43 46 50 Per hundred .50 .56 .60 .66 -75 •83 -93 I -00 ] •35 [.70 2.05 2.50 Corks. Best Quality . Flat. For w de mouth bottles, jars, etc. Diam., top, mm. 50 S3 56 59 62 65 68- 71 75 Per t-en .14 .15 .17 .19 .23 .26 .30 144 Bausch &■ Lomb Optical Co., Rochester, N. V., U. S. A., 13488 Diam., top, mm. 8i 87 93 100 112 I2S 138 150 13486. 13488. Per ten .35 .38 .45 .65 .90 .95 1.45 1.75 Corks. Flat. XX Quality. Double the above prices. Cork Borers. Of hard brass. Number in set 3 6 9 12 15 Per set .60 i.oo 1.75 2.40 13490. Cork Borer Sharpener. A steel cone with knife. Cork Files. See Files. Cork Knife. See Knife. 13492. Cork Plates. Size 100 x 300 mm. Thickness, mm. ,3 5 7 3.20 Each $1.00 13494. 13496. 13498. 13500. Each .08 Cork Press, Lever. Of cast iron. Size Small .16 Large Each .25 .70 Cork Press, Rotary. This press rolls the corks into the desired tap- ering shape without splitting them. In two sizes for corks up to 18 and 32 mm. diameter respectively. Size Small Large Each .50 .75 Cork Screw. Each $0.25 Cork Screw, Self-Pulling. With wire cutter. The most simple and practical cork screw made. Each $0.60 New York, Boston, Chicago, U. S. A., Frankfurt a/^I., Germany. 145 I3SI3 I3S08 I3S02. Cork Extractor. For drawing corks from inside of bottles without breaking them. Each $0.15 13504. Cork Tongs. For mattresses. Of brass, cork lined. Length, 175 mm. Each $1.00 Counting Apparatus, Esmarch's. For counting colonies of bacteria in tube cultures. The tube is held is spring clamps underneath a plate having apertures of different sizes which provide limited areas for counting. A magnifier on jointed arm facilitates count- ing. 13506. Counting Apparatus, Esmarch's. With handle. Each $4.00 13508. Counting Apparatus, Esmarch's. ]\Iounted on stand and provided with white and black backgrounds. Each $6.75 13510. Counting Apparatus, Rafter's. For counting organisms in water. Consists of a glass plate with rectangular cell, 50 mm. long, 20 mm. wide, I mm. deep, three covers for cell, disc micrometer ruled in millimeter squares, and a graduated i cc. pipette. The size of cell is such that when filled with i cc. of water, a square millimeter of surface represents a cubic millimeter of fluid. We recommend its use with 2/3 inch objective and I inch eyepiece. Each $5.00 13512. Counting Apparatus, Wolffhuegel's. For counting colonies of bac- teria in plate cultures. Consists of a wooden base, 270 mm. square, with drawer for accessories, and a ruled glass plate. The rulings are 10 mm. squares, with the diagonal rows ruled to 3 mm. squares. The ruled surface is 120 mm. square. Black and white back- grounds are provided. Each $5.00 146 Bausch <5' Lomb Optical Co., Rochester, N. Y., U. S. .\., I3SI6 13520 I35I4 13524 I35I4- Counting Plate, Jeffer's. Ruled on glass. For use with the Wolff- huegel apparatus. The circular surface is divided into sectors which are subdivided into small spaces of equal area. (See Jour- nal of Applied Microscopy and Laboratory Methods, Vol. I, No. 3.) Each $2.00 Coverglass and Slides. See JIicroscopical Coverglass and Slides. Covers for Beakers, etc. See Glass Plates and Watch Glasses. Creamometers. See Milk Testing Apparatus. 13516. Crucibles. These crucibles are guaranteed to be equal in form and quality to the Battersea crucibles. A B C D E F Height, mm. 68 75 90 100 115 127 Diameter, mm. 43 47 56 60 74 75 13520. 13522. Per hundred. Net 1.50 1-75 2.00 2.75 3-50 5-00 G H J K L M Height, mm. 143 ISO 167 185 200 215 Diameter, mm. 93 96 112 120 133 145 Per hundred. Net 6.75 9.00 13.00 13.50 18.00 27.50 Crucibles, Black Lead or Plumbago, Dixon's. The very best qual- ity. For prices of crucibles No. 14 and upwards multiply the num- ber desired by $0.0654, and result is the price of the crucible. Numbers o 00 000 0000 123 Height, mm. 50 60 65 75 95 no 135 Diameter, mm. 38 45 45 60 80 95 no Each, Net ■15 •15 •15 ■15 •25 •30 •35 Numbers 4 5 6 7 8 10 12 Height, mm. 14s 150 •6s I7S 185 200 200 Diameter, mm 120 125 135 140 147 ISO 160 Each, Net .40 •45 -50 •55 .60 •70 •72 rucible Covers, Black Lead or Plumbago, Dixon's For No. 13520 Numbers 00 000 0000 I 2 3 Each, Net .10 .10 .10 .10 .10 .10 .10 Numbers 4 5 6 7 8 10 12 Each, Net •15 •IS ■15 •15 -18 New York, Boston, Chicago, U. S. -V., Frankfurt a/M., Germany. 147 13526 13530 13524- Crucibles, Copper. Made of sheet copper spun into shape. With covers. Capacity, cc. so lOO 250 Height, mm. 40 45 70 Diameter, mm. 50 60 85 13526. 13528. 13530. 13532. 13534- 13536. 13538. Each .60 .70 Crucibles, Denver Fire Clay. Capacity, grams 5 10 Height, mm. 65 75 Diameter, mm. 60 65 12 IS 20 30 40 80 90 95 120 140 70 70 75 80 85 Per hundred. Net 2.50 3.00 3.00 3.00 4.00 6.00 Crucible Covers, Denver Fire Clay. For No. 13526. Per hundred. Net 2.25 2.25 2.25 2.25 3.50 4.00 Crucibles, Denver Fire Clay. French pattern. Numbers 689 Height, mm. 100 125 145 Diameter, mm. 55 65 75 8.00 5.00 Per hundred. Net 3.50 7.00 8.00 Crucible Covers, Denver Fire Clay. For No. 13530. Numbers 689 Per hundred. Net 2.25 2.25 3.50 Crucibles, Hessian Sand. Triangular t'orm. Threes Small 5s Centimetets Number in nest 3 4 3 Height, mm. 90 100 no Diameter, mm. 70 75 80 Large 5s 5 Sixes 6 120 145 100 120 Per nest .05 .06 .08 Crucibles, Iron, Cast. With covers. Capacity, cc. 250 500 1000 4000 Each 1. 00 1.50 2.00 3.00 4.50 Crucibles, Iron. Spun. Made of sheet iron spun into shape, covers. Capacity, cc. 15 30 60 125 250 Height, mm. 30 40 50 60 75 Diameter, mm. 40 55 65 80 95 Each With •25 .30 -35 .40 .85 148 Bauscli &• Lomb Optical Co., Rochester, N. Y., U. S. A., 13534 I3S38 13540 13544. 13558 13545 13542 13548, 13556 1355° I35S2, 13554 13540. 13542- Crucibles, Iron, Skidmore's. Normal School Form. Made of spun iron and designed for individual use or general experimentation. Can be used as an open or closed crucible, or as a retort, and, be- ing of thin metal, is easily brought to a red heat over the flame of an ordinary burner. Capacity, cc. 45 180 Each 1. 00 2.00 Crucibles, Pure Nickel. With covers. These are very practical for use in alkali solutions where there is danger of ruining a platinum crucible. Capacity, cc. 20 30 75 100 250 450 Diameter, mm. 35 40 50 60 80 100 13544. Each Crucibles, Platinum. Crucibles, Imperial With covers. Numbers Capacity, cc. Diameter, mm. .60 .70 .go 1. 00 1.50 2.00 See Platinum Ware. Berlin Porcelain. Glazed inside and outside. 8 30 7 6 5 4 3 2 I 15 25 30 60 110 130 200 35 40 45 55 6S 70 80 Each .10 .10 .15 .15 .24 .30 .35 .50 13546. Crucible, Imperial Berlin Porcelain, Caldvyell's. Conical shape; with ilange to hold the loose perforated bottom. Each $0.40 13548. Crucible, Imperial Berlin Porcelain, Gooch's. With cover and per- forated bottom. Capacity, 25 cc. Each $0.45 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 149 I35SO. 13552- 13564 Crucibles, Imperial Berlin Porcelain, Rose's. and tube. (See illustration, page 149.) Capacity, cc. 15 30 With perforated cover 60 I3SS4- 13560- 1356a. Each .50 .60 .75 Crucibles, Imperial Berlin Porcelain. Royal Berlin form; glazed in- side and outside. With cover. (See illustration, page 149.) Numbers 000 00 o I 2 3 4 S Capacity, cc. 5 13 14 25 50 80 140 280 Diameter, mm. 25 33 38 46 55 68 80 87 Each .12 .12 .18 Crucibles, Royal Berlin Porcelain. covers. Numbers 00000 0000 Capacity, cc. J4 2 Diameter, mm. 14 18 .24 .35 .40 .50 .55 Glazed inside and outside. With 000 5 25 00 13 33 o 14 38 Each .05 .06 .09 -15 -25 Numbers I 2 3 4 S Capacity, cc. 25 50 80 140 280 Diameter, mm. 46 55 68 80 87 Each -25 ■35 •45 ■50 .60 13556. Crucible, Royal Berlin Porcelain, Gooch's. With cover and perfor 13558. ated bottom. Capacity, 25 cc. Crucibles, Royal Meissen Porcelain With covers. (See illustration, page 149.) Numbers 1234 Capacity, cc. 200 130 no 60 Diameter, mm. 80 70 65 55 Each $0.50 Glazed inside and outside. S 30 45 6 25 40 Each Numbers Capacity, cc. Diameter, mm. -45 7 15 35 -35 8 8 30 .30 9 4 23 -25 10 2 18 .18 II I 14 .18 Each .12 .12 .12 .12 .12 Crucible, Royal Meissen Porcelain, Caldwell's. With flange to hold the loose, perforated bottom. Each $0.60 Crucibles, Silver. Any size made to order. Price quoted on application. Crucible Tongs. See Tongs. 150 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 13568 1357° 13564- Crusher. For quickly reducing ores to a fine powder. Plate and rubber of chilled iron. (See illustration, page 150.) Size of plate, mm. 450x600 600x900 Each 9.00 15.00 Crusher, Bosworth's. For laboratory use. The jaws are 75 mm. wide and open 50 mm., taking pieces of ore as large as 40 x 40 x 65 mm. It crushes 25 kilos in one hour to maximum size of l}4 mm. (1/16 inch.) 13566. Crusher, Hand. Each, Net 13568. Crusher, Hand. With pully attachment. Each, Net 13570. Crusher. Separate parts for Bosworth's. a Stationary chilled jaw plate. Each, Net b Steel cheek plate and bolts. Per pair. Net c Wrought iron movable jaw plate. Each, Net d Movable jaw Each, Net e Toggle plate. Each, Net f Duplicate of "E." Each, Net g Pitman. Each, Net h Steel crank shaft Each, Net i Spring rod. Each, Net j Eye bolt, for attaching plate to jaw. Each, Net k Toggle frame bolt. Each, Net $30.00 $0.50 $0.75 $0.50 $2.00 $0.50 $0.50 $1.50 $3.00 $0.50 $0.35 $0.10 New York, Boston, Chicago, U. S. .\., Frankfurt a/M., Germany. 151 I3S72. 13574 1 Steel toggle pin. m Movable jaw shoe, n Ptilly wheel, o Hand wheel. Each, Net Each, Net Each, Net Each, Net $0.25 $0.50 $4.00 $3.00 which 13572. Crusher, Ore. For reducing ore to an impalpable powder greatly facilitates analysis. Any desired pressure may be obtained. The mortar, as well as the pestle, revolves and by means of a scraper the ore is kept in the center. The combined rolling and sliding motion reduces the hardest ore very rapidly. This grinder may be operated by any convenient power of which not to exceed one-eighth horse power is required. The mortar is about no mm. diameter. Without mortar. ^ Each, Net $50.00 13574. Crusher, Ore. With agate mortar and pestle. Each, Net $60.00 13576. Crusher, Weatherhead's. Crushes and pulverizes coarse material from clay to pig iron in remarkably short time, discharging them as soon as pulverized. The cover may be used as a hand mortar, the ends of the handle serving as a pestle. Each, Net $25.00 152 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 13586 13594 13578. 13580. 13582. 13584. 13586. 13588. 1359°. 13592. 13594. 13596. Culture Plates. Of fine white glass. Size, 130x85 mm. Edges not ground. Per ten $0.40 Culture Plates. Same as No. 13578 but with edges ground. Per ten $0.50 Culture Plate Bench. For supporting culture plates. Of one piece of glass with ends bent. Size, 140 x 50 .x 35 mm. Culture Plate Bench. For supporting culture plates, with ground edges cemented to glass cross pieces. X 10 mm. Culture Plate Box. Each $0.20 A glass plate Size, 130x50 Each $0.25 F'or holding plates during sterilization and stor- ing them until used. Made of sheet iron with deep cover. Di- mensions, 140x50 mm. and 180 mm. high. Each $1.00 Culture Slide. For drop cultures. Polished plate glass slip, 25x75 mm. with cavity 16 mm. diameter. Each $0.30 Culture Slide. A glass slip, 25 x 75 mm. diameter, with concave pol- ished center 12 mm. diameter. Each $0.05 Culture Slide. With two concavities each 12 mm. diameter. Each $0.10 Culture Slide. For moulds. Consists of a glass ring with ground- in side tube-s, attached to a 25 x 75 mm. slide without the use of cement, which makes it suitable for the most delicate cultivations. Diameter of cell, 17 mm.; depth, 12 mm. Length of tubes, 60 mm., much longer than shown in illustration. Each $1.00 Cupels, Hoskin's. Made of the best bone ash; guaranteed. Diameter, mm. 30 38 45 Per hundred, Net 1.75 2.25 3.00 New York, Boston, Chicago, U. S. .\., Frankfurt a/M., Germany. 153 I36IO 13602 13604 13606 I36I2 I36I4 I3S98. Cupels, Torry and Eaton's. 13600. 13602. 13504. 13606. 13608. 13610. Diameter, mm. To absorb (approx.) grams 25 10 28 15 32 20 35 25 Per hundred. Net Diameter, mm. To absorb (approx.) grams 2.00 38 30 2.50 42 45 3.00 45 50 350 SO 75 Per hundred. Net Cupel Moulds. Of brass Diameter, mm. 4.00 30 4-50 38 5.00 6.00 Each 2.30 3.00 Cupel Moulds. Of iron. California pattern. Diameter, mm. 30 38 Each 1.7s 2.00 Cupel Rake. Of iron, 600 mm. long Each $0.45 Cupel Shovel. Of iron, 600 mm. long Each $0.45 Cupel Tongs. See Tongs. Cupel Tray. Of cast iron, with sixteen shallow,, square depressions. Each $1.25 Cups, Miner's. Agate nickel steel, seamless. Capacity, approx. cc. 1000 1500 Height, mm. • 130 150 Diameter, mm. no 130 Each ■55 .70 154 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., I36I2. 13628 I36I8 Cylinders. Of heavy glass; with pour-out. Height, mm. 100 125 125 150 150 Diameter, mm. 25 25 40 25 40 13630 175 30 200 210 250 30 40 40 Each •15 .16 .18 .16 .22 .24 •25 .26 .•30 Height, mm. 260 300 300 315 350 36s 375 450 Soo Diameter, mm. 45 40 50 65 SO 65 SO SO SO I36I4. Each .35 .35 .45 .55 .50 .60 .50 .65 Cylinders. Of heavy glass ; with rim around top. Height, mm. 100 125 125 150 150 175 200 Diameter, mm. 25 25 40 .16 .18 .16 .22 300 300 315 350 45 40 so 65 50 2S 40 30 30 210 40 •75 250 40 Each Height, mm. Diameter, mm. •15 260 .24 365 65 •25 375 SO .26 450 SO •30 500 50 13616. Each .35 .35 .45 .55 .50 .60 .50 .65 .75 Cylinders. Of heavy glass, with enlarged top. Especially adapted for lue with hydrometers. Height, mm. 350 450 300 400 Diameter, top, mm. 50 60 75 75 Diameter, bottom, mm. 40 45 50 65 13618. Each .40 1. 00 .50 Cylinders. Witli ground top for glass plates. Height, mm. 200 300 300 400 Diameter, mm. 100 80 100 80 Each .70 1. 00 1.25 1.20 •75 New York, Boston, Chicago, U. S. -V,, Frankfurt a/M., Germany. 155 Cylinders, Graduated, for General Laboratory Work. These cylin- ders are of superior quality being carefully made under our own supervision. They are adjusted by accurate measurement with water at 15° C. and are graduated with semi-circu'ar markings for quick reading. 13620. Cylinders. With foot, lip and pour-out. (See illustration, page 155.) Capacity, cc. 5 10 15 25 50 75 100 150 Each .22 .25 .28 .30 .35 .40 .50 .60 Capacity, cc. 200 250 300 500 1000 2000 3000 Each .70 .80 .90 1. 00 1.50 3.00 3.50 13622. Cylinders. With double graduations, reading up and down. Capacity, cc. s 10 25 50 100 250 500 1000 2000 Each .25 .30 .35 .40 .60 .90 1.20 r.8o 3.40 13624. Cylinders, Mixing. With ground glass stopper. Capacity, cc. 10 25 50 75 100 150 Each .40 .50 .55 .65 .75 .80 Capacity, cc. 200 250 500 1000 2000 Each i.oo i.is 1.30 2.25 3.7s 13626. Cylinders, Mixing. With double graduations, reading up and down, and ground glass stopper. Capacity, cc. 10 25 50 100 250 500 1000 2000 Each .50 .60 .70 .80 1.20 1.65 2.4s 4.00 Cylinders for Laboratory Work of Precision. These cylinders have circular (all-round) markings for very accurate reading, and are graduated by weight on delicate balance. They are standardized to meet the requirements of the German Imperial Commission. A certificate of accuracy is supplied with each instrument. (See il- lustrations No. 13628 and 13630, page 155. 13628. Cylinders. With foot, lip, and pour-out; adjusted for inflow. Capacity, cc. 5 10 25 50 100 •Graduated, cc. 1/20 i/io 1/5 1/5 i/l Each Capacity, cc. Graduated, cc. •45 200 2/1 •50 250 S/i .60 500 5/1 •75 1000 lo/i 1.00 2000 20/1 3000 50/1 Each 1. 25 1.50 2.00 3.00 5.00 6.00 13629. Cylinders. With double graduations, reading up and down. Capacity, cc. s 10 25 50 100 Graduated, cc. 1/20 i/io i/s 1/5 i/i Each Capacity, cc. Graduated, cc. •55 200 3/1 .60 250 5/1 •65 500 5/1 .80 1000 10/ 1 1.20 2000 20/1 Each 1.50 1.80 2.40 3.60 6.00 13630. Cylinders, Mixing. With ground glass stopper; adjusted for inflow. Capacity, cc. 5 10 25 50 100 Graduated, cc. 1/20 i/io i/s i/s i/i Each Capacity, cc. Graduated, cc. •75 200 2/1 .80 250 S/i 1.00 SOD 5/1 I.IO 1000 lo/i I. so 2000 20/1 156 Each 2.00 2.30 2.60 4.50 7.50 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., ^^ 13642 13632 13644 13631- 13638, 13640 Cylinders, Mixing. With double graduations, reading up and down. Capacity, cc. 5 10 25 50 100 Graduated, cc. 1/20 i/io 1/5 1/5 i/i Each Capacity, cc. Graduated, cc. .90 I. CO 1.20 1-35 200 250 500 1000 2/1 5/r S/i lo/i 1.80 13632. 13634- 13636. 13638. 13640. Each 2.40 2.80 3.20 5.40 We will also supply these cylinders (on import orders only and at a higher price) tested by the German Imperial Commission whose endorsement of accuracy is stamped upon each instrument. Prices on application. Cylinders, Reagent. With glass stop cock and stopper; on wooden base. Size, 180 x 25 mm. Each $2.25 Cylinders for Nessler's Ammonia Test. See Colorimetric Deter- mination Apparatus ; Nessler Tubes. Cylinder, Steel. See Gas Holders. Decanting Jars. See Jars. Deflagration Globes. Of well annealed glass; with ring neck. Diameter, mm. 225 300 Each 1.20 1.60 Deflagration Globes. With cup and stand. Diameter, mm. 225 300 Each 1.90 2.35 Deflagration Spoons. Of brass; for burning phosphorous, sulphur, etc., in oxygen. Diameter of bowl, mm. 12 25 Each ■15 .20 ion Spoons. Of iron. Diameter of bowl, mm. 12 25 Each •15 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 157 ||QL_-Mii!F-Lii"4J!JS llM 13646 13648 13642. Deflagration Spoon. For decomposition of water by sodium, brass gauze bowl and wooden handle. (See page 157.) Each With $0.45 13644. Dehydrating Apparatus, Schultz'. Specially adapted for hardening delicate tissues. The object is placed in a glass tube whose lower end is covered by an animal membrane. This tube hangs inside another similar tube, also diaphragmed, which is suspended from the neck of a heavy glass bottle. The bottle has glass cap ground on air tight. Upon filling the tubes with water and the bottle with alcohol, a slow osmotic action takes place, hardening the object very gradually. Delicate tissues are not so apt to shrivel and col- lapse in this apparatus. For less sensitive objects, one of the tubes may be removed when hardening proceeds much more rapidly. Diameter of inner tube, 10 mm.; capacity of vessel, 100 cc. (See illustration, page 157.) Each $1.25 13646. Dehydrating Apparatus, Thomas'. This apparatus consists of a heavy glass jar 190 x 190 mm., having a glass cover fitting air tight. Supported in the jar are glass cylinders of various diameters and about 150 mm. long, each cylinder having in the bottom a replace- able chamois skin diaphragm fastened by a nickeled spring. The cylinders are supported at any desired height by rubber rings rest- ing on the vulcanite plate instead of springs as shown in illustra- tion. The dehydrating fluid is placed in the jar and the cylinders partly filled with a weaker solution in which the tissue to be hard- ened is placed. By osmosis the dehydrating fluid gradually acts on the tissue which does not shrink as when hardened in the usual manner. Each $7.50 13648. Demijohns. Of glass, with rattan cover. Capacity, liters 2 4 8 12 20 Each .40 •50 •75 1.50 158 Bausch & Loinb Optical Co., Rochester, N. Y., U. S. A., 13662 13650 13654 13658 13660 13650- 13652- 13654- 13656. 13658. 13660. 13662. Desiccators. Consist of a porcelain acid dish covered by a bell glass ground air tight to a glass plate. Diameter of acid dish, mm. 115 130 155 Diameter of bell glass, mm. 150 200 250 Size of plate, mm. square 200 250 300 Each 2.50 3.50 4.50 Desiccator. With manometer, glass stop cock and ground plate. Height, 200 mm.; diameter, 150 mm. Each Desiccator, Atwater's. With triangle. Each Desiccators, Fresenius'. 160.) Diameter, mm. glass $6.75 $1.80 With cover ground on air tight. (See page 80 IOC 120 Each .go Desiccator, Fruhling and Schultz'. 175 mm.; diameter, 200 mm. Desiccator, Fruhling and Schultz'. 1.20 1.50 With porcelain plate. Height, Each $5.50 With ground in stop cock. Each $g.oo Desiccators, Hempel's. The absorbent is placed in the cover where it is most effective as the water vapor rises to the top of the ap- paratus. Thus the entire lower part is available for drying pur- poses. Provided with glass stop cock and suspension hook on ground glass stopper. Diameter, mm. 100 125 150 Each 3-50 3-75 4-50 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 159 13664 13674 13666 I3664. Desiccators, Reinhardt's. The enlarged top affords space for the ab- sorbent, leaving the entire lower part available for drying purposes. The cover is ground into recess air tight, and cannot slip off when the desiccator is carried about. Height of cylinder, mm. 80 150 Diameter of cylinder, mm. 80 150 Each 3.00 5.00 13666. Desiccators, Scheibler's. With cover ground on air-tight. Diameter, mm. 100 120 150 Each 1.20 1.40 1.75 [3668. Desiccators, Scheibler's. With porcelain plate for crucibles. Diameter, mm. 100 120 150 Each 2.00 2.50 3.25 13670. Desiccators, Scheibler's. With air-tight cover stop cock and hook. Diameter, mm. 100 120 150 Each 2.70 2.80 3.35 13672. Desiccators, Scheibler's. With side tube and stop cock. Diameter, mm. 100 120 150 Each 2.70 2.80 3.35 13674. Desiccators, Vacuum. Very heavy glass; with rubber stopper, stop cock and porcelain plate. Diameter, mm. 100 140 160 Each 4.00 525 6-75 160 Bausch &■ Lonib Optical Co., Rochester, N. Y., U. S. A., 13702 13694 13696, 13704 13678 13687 13675- 13676. 13678. 13685 Desicator Support. Of pure nickel; 150 mm. diameter; holding 13 crucibles, 15 to 25 cc. Each $0.75 Desiccator Plates. Of porcelain. Diameter, mm. 95 110 145 Each .75 .go 1.25 Dialyzers. Consist of an open top bell glass suspended in a glass jar. The large end of the bell glass is covered with parchment. Capacity, liters 2 4 6 8 12 Each 1.25 1.50 2.50 3.50 5.00 13680. Dialyzers, Graham's. Consist of two glass parts; the inner part to which parchment paper is fastened, is supported by its rim upon the edge of the outer vessel. Supplied without parchment paper. (See illustration, page 162.) Diameter, mm. 100 150 200 250 13682. Per meter .08 .10 .14 .18 .20 Dialyzers, Parchment Paper for. See Paper. 13684. Diamond. For writing on glass. A fine diamond mounted in .1 metal handle. Each $2.50 Diamond for cutting glass. See Glass Cutter. Diamond Ink. See Ink. Diamond Mortars. See Mortars. 13685. Diaphanoscope, Vogel's. For determining the fatness of barley and the dissolution of malt. Each $9.00 Dies. See Figures and Letters. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. fz^ Each 1.30 1.80 2.25 ,3.00 Dialyzer Tubing. Made of heavy parchment. Diameter, mm. 45 55 70 90 no 13692 13708 13710 13686. 13687. Diffusion Shells, Schleicher & SchuU's. No. 579. Size, mm. 100x16 100x35-40 Each .15 .34 Digestion Apparatus. See Kjeldahl Apparatus. Dippers, Agateware. With wooden handle. (See page 161.) Height, mm. 75 85 90 95 Diameter, mm. no 135 150 175 Each .60 Dishes, Acid. See Acid Basins. .70 •75 .go 13688. Dishes, Crystallization. High Form. Of clear white glass; with flat bottom and polished edges. Height, mm. 40 50 60 80 100 120 Diameter, mm. 40 SO 60 80 100 120 Each ■14 ■IS .16 •25 •30 13690. Dishes, Crystallization. Low Form. Of clear white glass; with flat bottom and polished edges. Diameter, mm. 30 40 50 60 70 80 go Each .10 .10 .11 .12 .14 .16 .18 Diameter, mm. 100 no 130 150 170 190 210 Each .20 .22 .30 .40 •45 ■SO .60 Diameter, mm. 240 270 300 350 400 450 Each .80 13692. 20 2.00 3.00 4.50 5.40 Dish, Culture. For moulds. Consists of a shallow dish with cover ground on and a funnel ground in the cover. Diameter of dish, 100 mm. Each $0.90 Dishes, Culture. See Moist Chambers. 162 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 13694- Dishes, Evaporating, Agateware. Seamless; flint enameled; acid proof. (See illustration, page 161.) Capacity, liters 5/2 i 2 4 8 12 Diameter, mm. 125 200 225 300 400 450 Each .go 1.15 1.50 2.10 3.00 4.20 13696. Dishes, Evaporating. Aluminum. With lip. (See page 161.) Diameter, mm. 40 SO 60 70 80 100 120 ISO Each 1. Dishes, Evaporating. Diameter, mm. .10 .11 .12 .13 Baloc Glass. With lip. SO 60 70 80 .14 (See 90 .16 page lOO •25 162.) no ■35 120 Each Diameter, mm. .14 .16 .18 .20 130 140 ISO 160 .22 170 .25 180 .30 200 ■35 Each .40 .42 .45 ,50 .60 .65 .75 13700. Dishes, Evaporating. Jena Glass. May be used in place of por- celain evaporating dishes and have the advantage of permitting one to look through them. Diameter, mm. 60 70 80 go 100 no Each .22 .25 .30 .35 .45 .55 Diameter, mm. 125 13S 150 200 250 300 Each .70 .80 .95 1.25 1.60 2.25 13702. Dishes, Evaporating. Iron. Porcelain lined; with two handles. (See illustration, page 161.) Diameter, mm. 80 100 120 150 180 Each .30 .40 .50 .80 1. 00 Diameter, ram. 200 240 300 360 400 Each 1.20 1.50 2.25 3.00 4.20 13704. Dishes, Evaporating. Pure Nickel. With lip. (See page 161.) Diameter, mm. 40 50 60 70 80 90 100 120 150 Each .20 .50 .5o .75 i.oo 1.15 1.25 1.75 2.25 Dishes, Evaporating. See Kettles. 13706. Dishes, Evaporating, Imperial Berlin Porcelain. Shallow form, with flat bottom; for rapid evaporation and crystallization. (See page 162.) Numbers 123 4.56780 Diameter, mm. 70 80 95 los 120 140 160 180 200 Each .15 .22 .25 .30 .35 .45 .50 .65 .85 13708. Dishes, Evaporating, Imperial Berlin Porcelain. Glazed inside; with wooden handle. (See illustration, page 162.) Numbers, 12345 Capacity, cc. 30 50 120 250 500 Diameter, mm. 60 70 100 125 170 Each .25 .35 .40 .50 .65 13710. Dishes, Evaporating, Imperial Berlin Porcelain. German form. Glazed inside; with lip. Sizes above No. 7 have heavy glazed rim. (See illustration, page 162.) Numbers 00 o i - 3 3a 4 5 Capacity, cc. 100 150 250 400 600 800 1000 1500 Diameter, mm. 95 115 140 170 195 215 235 260 Each !i6 ^2 ^25 [30 45 ^50 [65 ^ New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. lS'\ 13722 13736 13724 I37I8 I37I2 I37M- Numbers 6 7 8 9 10 II 12 Capacity, cc. 2000 3000 3S00 4500 5500 6000 7500 Diameter, mm. 285 300 315 340 385 40s 450 Each 1.20 1.50 1.75 2.10 2.7s 3-75 $•00 ishes, Evaporating, Imperial Berlin Porcelain. Royal Berlin form. Numbers 000 00 I 2 3 Capacity, cc. 25 50 80 100 140 175 Diameter, mm. 50 70 80 85 90 100 Each .12 •14 .16 .18 .22 •25 Numbers 4 5 6 7 8 8a Capacity, cc. 210 300 385 765 1285 1430 Diameter, mm. no 120 145 I8S 21S 230 Each •35 •45 •65 .80 I.IO 1.40 Numbers 9 10 II 12 13 Capacity, cc. 2200 3250 5700 lOOOO 16500 Diameter, mm. 26s 305 360 400 460 Each 1.70 2.50 3^75 7.00 10.00 )ishes, Evaporating, Royal Berlin Porcelain. With lip Sizes 00 to S glazed inside and outside. Numbers 000 00 I 2 3 Capacity, cc. 25 50 80 100 140 175 Diameter, mm. SO 70 80 8s 90 100 Each .12 .18 .20 .28 •32 •35 Numbers 4 S 6 6a 7 8 Capacity, cc. 210 300 385 535 765 1285 Diameter, mm. no 120 145 162 i8s 215 Each •45 •52 .70 .80 ■85 I.IO Numbers 8a 9 10 II 12 13 Capacity, cc. 1430 2200 3250 5700 1 0000 16500 Diameter, mm. 230 265 305 360 400 460 Each 1.40 1.70 2.75 3^40 8.00 13.60 164 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A.. 13732. 13734 13738 13716. Dishes, Evaporating, Royal Berlin Porcelain. With lip. Shallow form. (See illustration, page 162.) Numbers 1234567 Capacity, cc. 45 60 95 160 200 350 550 Diameter, mm. 70 80 95 105 130 140 160 Each •30 -35 •45 ■55 .70 .85 13718. Dishes, Evaporating, Royal Meissen Porcelain. With lip and flat bottom. (See illustration, page 164.) Numbers 000 00 o i 2 3 4 Capacity, cc. 8700 6200 4750 3750 2250 1700 iioo Diameter, mm. 400 360 340 300 270 250 220 Each 6.00 5.25 3.50 2.50 1.85 1.55 1.30 Numbers 5 6 7 8 9 10 11 Capacity, cc. 870 525 280 190 120 50 20 Diameter, mm. 190 165 13S 123 no 83 65 Each 1. 00 .70 .50 Dishes, Evaporating. See Kettles. •35 -30 •15 13720- 13722- 13724- 13726. 13728. 13730. 13732- Dishes, Evaporating, Silver. Any size made to order. Price quoted on application. Dishes, German Silver. Large; with lip and counterpoise. For weigh- ing sugar samples. (See illustration, page 164.) Each $3.00 Dishes, German Silver. Scoop form. (See page 164.) Each $3.00 Dishes, Lead. Used as container in etching glass with hydrofluoric acid. Diameter, mm. 50 65 75 100 125 150 Each .08 .16 •25 ^35 •45 Dish, Pasteur. Made of best white German glass. Has thinner walls and is shallower than the Petri dish, permitting the use of higher power objectives in the examination of colonies. Diameter, 100 mm.; depth, 5 mm. Each $0.25 Dish, Pasteur. With top and bottom polished; extra fine. Each Dishes, Petri. Made of best white German glass. Diameter, mm. 50 80 100 120 150 Depth, mm. 10 10 10 15 15 S0.50 Each -15 •25 .40- .60 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 165 13740 13746 I3734- 13736. 13738. 13740. 13742- 13744. U •'^° -^ 13744 Dish, Petri. With top and bottom polished; extra fine. Diameter, 100 mm.; depth, lo mm. Each $0.50 Petri Dish Holders. Hold a number of 100 mm. dishes, one above the other so that they occupy small space. Made of nickeled spring wire, with brazed joints. (See illustration, page 164.) Number of dishes 3 6 Each .40 .60 Dishes, Platinum. See Platinum Ware. Dishes, Preparation. Of clear white glass; with cover ground on air- tight. May be sealed for permanent preservation or used without sealing for ordinary purposes. (See illustration, page 165.) Diameter, mm. 40 70 100 Each .20 .30 .35 Dishes, Preparation. Of clear white glass; with loosely fitting cover. While not perfectly air-tight the deep rim of the cover renders the dish sufficiently so for most purposes. Diameter, mm. 50 60 70 90 100 Each .20 .28 -35 .50 .60 Of clear white glass; with broad flange Dishes, Preparation, top and perfectly ground, air-tight cover with knob. Height, mm. 30 35 40 45 Diameter, mm. 50 .65 80 100 at Each .45 .50 Dishes, Staining. See Staining Dishes. Dishes, Stender. American make. Height, mm. 24 30 Diameter, mm. 36 50 .55 35 60 •65 90 60 Each .09 .14 166 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., M 13753 13748 13749 13750 13754 13752 13746. Dishes, Stender. German make. These dishes are made from best white glass, with accurately ground, air-tight cover. Height, mm. 25 30 35 40 50 60 70 90 Diameter, mm. 40 50 60 80 100 120 140 50 Each .24 .24 .30 .40 .50 .85 1. 00 .50 13748. Displacement Apparatus. Of clear white glass. Consists of a sep- aratory funnel, having ground glass stopper and stop cock, ground into receiver. Capacity, cc. 250 500 1000 2000 Each 2-75 3.00 3.50 4.00 13749- 13750. 13752. 13753- DISSECTING INSTRUMENTS Blowpipe. Of nickeled metal, 120 mm. long. Each $0.15 Forceps, Artery (Serrafines). Small, self-closing, steel forceps with corrugated points and handles; nickeled. Length, 55 mm. Each $0.40 Forceps, Bone^utting. Strong, accurately made blades; pinless lock joint holding the blades together firmly during use, and also permitting their separation for cleaning. The spring is also removable. Length, mm. 200 225 Each 2.50 2.75 Forceps, Bone-Cutting. Of best steel, nickel plated. Very strong curved blades. With spring for separating the blades. Each $1.15 Special sets made uj) lo order- New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 167 13754- 13755- 13758. 13760. 137^2. 13764- 13752 Forceps, Cover Glass. These forceps are of steel, best quality finish and nickeled. Corrugated handles. Forceps, Cover Glass. Bent blades; length log mm. Each $0.45 Forceps, Cover Glass. Thin, straight blades; guide pin; length, 115 mm. Each $0.50 Forceps, Cover Glass. Self-closing; thin, bent blades; length 125 mm. Eacli $0.65 Forceps, Cover Glass, Cornet's. Made of one piece of spring brass, nickel plated. They are self-closing and hold the cover firmly. Only a small surface of the cover is touched by the tips of the forcep. Length, 120 mm. Each $0.45 Forceps, Cover Glass, Ehrlich's. With long, flat blades which come together accurately so that a cover is held firmly on the edge dur- ing the operation of making a blood spread. Have locking device to hold blades together. Length, 135 mm. Each $1.10 Forceps, Cover Glass, Novy's. These forceps have a flat, lower blade with a broad end and thin sharp edge, and a curved, pointed upper blade. The thin edge of the lower blade enables a cover to be easily picked up; the curve of the upper blade prevents capillary drainage, while the small contact of the point on the specimen en- ables it to be thoroughly washed. Made of steel, nickel plated. Each $0.45 Special sets made up to order- 168 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. 5. A., 13788 1379° ^3792 13794 13796 Forceps, Cover Glass. Novy's. With locking device which holds the points together. (See page i68.) Each $1.25 13768. Forceps, Cover Glass, Stewart's. Made of nickeled spring wire; light; easily sterilized; self-closing. Only a small surface of the cover is grasped by the blades. May be laid on the table, holding the cover perfectly level. (See page 168.) Each $0.15 13770. Forceps, Cover Glass, Stewart's. With ring to prevent blades from spreading sideways. (See page 168.) Each $0.10 Forceps, Dissecting. These instruments are our best quality; made of best steel, nickel plated and finished in the best possible manner. The handles are corrugated and the points file-cut. Guide pins en- sure accurate closing of the points. Catalogue ^ength, Numbers Description mm. Finish of Points Each 13772. Fine; straight points 115 Fine file-cut $0.40 13774- Fine; curved points no Fine file-cut .40 13776- Medium fine; straight points 115 B'ine file-cut .40 13778- Medium fine; curved points no Fine file-cut .40 13780. Medium heavy; straight point s los Corrugated -45 13782. Heavy; straight points. IIS Corrugated -45 13784- Heavy; straight points 130 Corrugated •45 13786. Heavy; straight points 145 Corrugated -50 13788. Heavy; straight points; for vertebrate work; no guide pin 125 Corrugated -35 Forceps, Dissecting. Theie instruments are best steel, nickel plated. Smooth handles. 13790. Forceps, Dissecting. Fine; straight, smooth Special sets made up to order- good quality, made of poinf=; length, 95 mm. Each $0.25 New York Boston, Chicagro, U. S. .^., Frankfurt a/M., Germany. 169 13798; 13800 13802, 13804 13808 13792- 13794- 13796- 13797- Forceps, Dissecting. Fine; curved, length, 120 mm. (See page 169.) fine file-cut points; guide pin; Each $0.30 Forceps, Dissecting. Of steel; heavy; straight, blunt, corrugated points; length, no mm. (See page 169.) Each $0.15 Forceps, Dissecting. Of spring brass, nickel plated; straight, blunt points; length, 83 mm. (See page 169.) Each $0.10 Forceps. For removing specimens from deep jars or bottles. Made of steel, nickel plated. Length, mm. 250 300 375 4S0 Each 1.50 2.00 2.75 3.50 Hones. For razors, scalpels, etc. The Yellow Belgian hone with Palm Oil soap is used for first grinding, followed by the Blue Green hone. These hones are of the finest possible grain, free from grit. They are selected with the greatest care and are guar- anteed perfect in every respect. Each is furnished in wood block with cover. The Blue hones have rubbing stone. Catalogue Number Description Size, mm. Each J.3798- Yellow Belgian 13800. Yellow Belgian 13802. Blue Green 13804. Blue Green 225 X SO 150x40 260 X so 180 X 40 $4.00 $2.50 $1.00 $0.75 13806. Palm Oil Soap. Per cake $0.15 13808. Hooks and Chains. Nickel plated; hooks with sharp points. Each $0.20 Special sets made up to order- ly o Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., I38IO I38I2 I38I6 I38I8 13820 13822 13824 1382613828 13830 13832 i38io. Knife, Brain. Blade very thin, of finest steel, in ebony handle. Length of blade, 185 mm.; width, 26 mm. Each $1.50 13812. Knife, Cartilage. All steel, nickel plated and best quality finish; ex- tra heavy and strong; corrugated handle; cutting edge, 45 mm. Each $0.35 13814. Knife, Cartilage. With good quality finish. Each $0.25 13816. Knives, Cartilage (Prosecting Knives). Ebony handle; blades extra heavy and extra thick at the back. Cutting edge, mm. 70 go Each .75 1. 00 Needles, Dissecting. Made of knife steel, with ebony handle. Catalogue Number Description Length, mm. Each 13818. Straight, sharp 13820. .Curved, sharp 13822. Curved, blunt I3S 130 130 Sl'ecial sets made up to order- $0.35 ■35 •35 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 171 \ 13846, 13848 N ^ -o»- — D — C = B ! 13840 13842 II 13834 13824- 13826. 13828. 13830- 13850 spear, single cutting edge Spear, double cutting edge Harpoon, two cutting edges Jrlook, fine and delicate 13836 130 .40 125 .40 14s .60 14s .40 13832. 13834- 13836. 13838. 13840- 13842. 13844. 13846. 13848- Needles, Dissecting. Straight; in cedar wood handle. Per ten $0.25 Needles^ Dissecting. Bent. Per ten $0.25 Needle Holders. With bone handle and nickeled, adjustable clamp holding any size needle. The steel needles illustrated, No. 13840, are recommended. Length, mm. 85 no Each .05 .07 Needle Holder (85 mm.), with set of needles No. 13840. Each $0.08 Needles. For above holders. Of steel; length, 50 mm. SO mm. Style B D Per ten .05 .07 .05 .05 Oil Stone. For sharpening scalpels, etc. These are genuine Ar- kansas stone. Length, 75 mm.; width, 22 mm. Each $0.60 Pan, Dissecting. Of copper, tinned inside; with corner hooks, chains and pings for holding animals. Size, 430 x 250 x 30 mm. Each $2.50 Pan, Dissecting. Of heavily tinned metal, japanned; with metal loops in the corners to which the limbs of animals are tied during dissection. Size, 280 x 220 x 35 mm. Each $0.25 Pan, Dissecting. Style 13846. Bottom lined with wax. Each $0.45 Special sets made up to order- 172 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 13852-13860 I3862-I3870 13850. Razor, Robb's Aseptic. For shaving animals preparatory to inocu- lation. It is easily cleaned and sterilized and there are no joints to accumulate septic matter. Made of best steel, nickel plated; with corrugated handle. Cutting edge, 70 ram. Furnished in neat case. (See illustration, page 172.) Each $2.00 Knives, Section. With straight steel blade, flat on one side, and solid ebony handle. Very best quality of steel with best quality finish. Each in case. Catalogue Number Length of Blade, mm. Each 13852- 13854- 13856- 13858- 13860. 140 120 100 90 75 $4.00 3-00 2.50 2.25 2.00 Razors, Section. Folding in case. These razors are made of the best quality English steel and especially designed for section cut- ting. The quality designated as "Best," has heavy back, less liable to yield under manipulation; while the other has lighter weight blade for general laboratory use. Catalogue Number Quality Length of Blade, mm. Shape Each 13862. 13864. Best 100 Flat concave Best 75 Flat concave Special sets made up io order- $1.50 I.2S New York, Boston, Chicago, -U, S. A., Frankfurt a/'M. , C^^m^^y. 173 13872 IBI BC DEFGHJKL 13874-13894 and 13904-13924 13866. Good 75 13868. Good 75 13870. Best 75 Flat concave i.oo Both sides flat 1.25 Both sides concave 1.25 13872. Saw, Bone. Of steel, nickel plated; with detachable blade for steril- ization. Length of blade, 200 mm. Each $3.00 Scalpels. These instruments are of best grade steel, properly tem- pered to retain a good cutting edge. They are carefully finished in every detail. The all-steel scalpels are easily cleaned and sterilized. We offer the following series of instruments: A Quality. Of superior stock and very best attainable quality. B Quality. For laboratory work where delicate work is to be done. C Quality. For student use in general dissection. A quality instruments are made of the best selected English steel, evenly tempered, ground to a full concavity to give a sensi- tive cutting edge, and finely finished. They are recommended for the most delicate dissections and where instruments of precision are required. B quality instruments are made of selected English steel, well tempered, ground to full concavity, and well finished. They are de- signed to meet the requirements of general laboratory dissection where a perfect cutting edge is essential. C quality instruments are made of selected steel, carefully tem- pered and ground to a semi-concavity. Recommended for student use in ordinary dissection. Equal to any purpose where an extra fine edge is not required. All instruments bear our mark B&L and letter designating quality. S'l'c'cial ^^ts made up to order- 174 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 13896-13902 I3926-I3932 I 3942-1 3948 Scalpels, Dissecting, page 174.) A quality; ebony handle. (See illustrations Catalogue Number Cutting Edge, mm. Style Each 13874- 13876. 13878. 13880. 13882. 13884. 13886. 13888. 13890. 13892. 13894. 35 35 35 10 SO SO 45 38 32 25 18 A $1.00 B 1. 00 C 1. 00 D 1. 00 E 1. 00 F 1. 00 G 1. 00 H 1. 00 J 1. 00 K 1. 00 L 1. 00 Scalpels, Dissecting. A quality; all steel. Easily cleaned and sterilized. Catalogue Number Cutting Edge, mm. Each 13896. 13898. 13900. 13902. 45 38 32 25 $1.25 1.25 1.25 I-2S Special sets made up to order- New York, Boston, Cliicago, U. S. .V., Frankfurt a/M., Germany. 175 Scalpels, Dissecting. B quality; ebony handle. (See illustrations page 174.) Catalogue Number Cutting Edge, mm. Style Each 13904. 13906. 13908. 13910. 13912. 13914- 13916. 13918. 13920. 13922. 13924- 35 35 35 10 SO- SO 45 38 32 25 18 A $0.35 B -35 C •35 D -35 E -35 F •35 G •35 H •35 J •35 K •35 L •35 No. 13912, having a straight cutting edge, is useful for trimming paraffin blocks, corks, etc. Scalpels, Dissecting. B quality; all steel. Easily cleaned and sterilized. Catalogue Number Cutting Edge, mm. Each 13926. 13928. 1393a 13932. 45 38 32 25 $0.40 .40 .40 .40 Scalpels, Dissecting. C quality; ebony handle. Catalogue Number Cutting Edge, mm. Each 13934^ 13936. i3938^ 13940. 45 38 32 25 $0.25 •25 •25 •25 Scalpels, Dissecting. C quality; all steel. Easily cleaned and sterilized. (See illustration, page 175.) Catalogue Number Cutting Edge, mm. Each 13942- 13944- 13946. 13948. 45 38 32 25 $0.30 •30 •30 •30 Special sets made up to order- 176 Biufch '■' -ciT,'- Optical Co., Rochester, N. Y., U. S. A.. 1395° 13952 I39S4 I39S6 13964 Scissors, Dissecting. Of steel, best quality, very finely finished. Made with lock joint, which ensures firmness and allows the blades to be quickly taken apart for thorough cleaning and sterilization. Nos. 13950, 13052 and 13954 are suitable for the most delicate dis- sections; Nos, 13956, 13958 and 13960 are heavier scissors, for gross anatomical work. Catalogue Number Description Length, mm. Each 13950. Fine; straight IIS $1.00 13952- Fine; curved IIS 1. 00 13954- Fine; bent IIS 1. 00 13956. Heavy; straight, one blunt blade 105 ■75 13958- Heavy; straight, one blunt blade IIS 1. 00 13960. Heavy; straight, one blunt blade 125 1. 00 13962. Heavy; straight, both blades blunt 140 1. 00 Scissors, Dissecting. Of steel, nickeled; best quality. Catalogue Number Description Length, mm. Each 13964. Fine; straight IIS $0.50 13966. Fine; curved 115 .60 13968. Fine; bent IIS .60 13970. Medium; straight 115 .40 13972. Medium; straight; one blunt point IIS -50 13973- Heavy; straight Special sets made up to order. 125 .60 JSew York, Boston, Chicago, U. S. A., Frankfurt a/M,, Germany. 177 13984 13974' Heavy; straight; one blunt point 13975- Heavy; straight; one blunt point 13976. Heavy; straight; one blunt point 13978- Heavy; straight; anatomical I2S .60 140 •75 150 .90 17s 1. 00 Scissors, Dissecting. Of steel. Catalogue Number Description Length, mm. Each 13980. 13982. Medium; straight; best quality ' 115 Medium; straight; good quality 115 $0.40 -25 13984. Scissors, Dissecting. These scissors are very delicate and are suited to the finest invertebrate dissecting. All metal parts are nickel plated; handles of genuine ivory. Length of instrument, 140 mm.; blades, 10 mm. $2.50 Section Lifters. Nos. 13986 to 13990 are of metal throughout, nickel plated, Nos. 13992 to 14002 have ebony handles. The blades of Nos. 13996 to 14000 are of spring metal, nickel plated, and are very thin and flexible. The perforated lifter. No. 14002, is very useful for handling delicate specimens. Special sets made up to order. 178 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 13988 1399° 13992 13994 13996 13998 14000 14002 ■ aiMM X \ ^^^K" ' 1 *-"" ■ ^^^^m-^i^ij^ii^^ ~\ f f ^^^__^/ 13986 Catalogue Width Number Length, ram. of Blade, mm. Each 13986. 200 II and 22 $0.25 13988. 160 5 and 22 •15 13990. 100 18 .10 13992. 135 6 and 10 .40 13994- 130 6 •35 13996. 147 10 •30 13998. 147 20 •35 14000. 157 35 .40 14002. 165 18 •75 Special sets made up to order. New York, Boston, Chicago, U, S. A., Frankfurt a/M., Germany. 179 r\ 14004 14022 14006 14024 14016 1 401 2 1 401 8 14004. Seeker. Nickeled steel. One end tapers to a blunt point; the curved end is sharply pointed and has an inner sharp edge. Length, 150 mm. Each $0.15 14006. Shears, Cartilage. These shears have short, knife-shaped blades, lock joint, and corrugated handles with detachable spring between them to open the blades. Made of steel, best quality, nickeled. Length, 230 mm.; blades, 60 mm. Each $2.25 Strops. These strops are made from the finest material obtainable and will meet all requirements. The block strops are a strip of finest leather, perfectly blocked on a solid wood back. The strop with swivel and handle is a wooden strip with prepared canvas on one side and fine leather on the other. Catalogue Number Description Length, mm. Each 14012. Block strop; coarse 375 X 65 $1.25 14014. Block strop; fine 375 X 65 1.25 14016. Leather and canvas strop, with swivel and handle. 450 X 60 4.00 14018. Razor st-op; 4-sided 350 1.50 14020. Strops. Dressing for above strops. Special sets made up to order- Vex box $0.25 180 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., El _=j=-. 14026, 14028 14022. Tenaculum. Steel, with sharp hook; ebony handle. Length, 160 mm. Each $0.25 14024. Tenaculum. All steel. Length, 160 mm. Each $0.40 DISSECTING INSTRUMENTS IN SETS The sets have been made up of the most desirable instruments for work in anatomy, botany, and histology. They are uniform in quality and finished in the neatest manner possible. The cases are our folding pocket form, the instruments thus occupying the least possible space and being thoroughly protected. Genuine Jlorocco leather is used in the best grade cases, best quality leatherette, al- most equal to leather in strength and appearance, being' employed for the cheaper sets. The inside of the cases is finished in velvet, cloth, or chamois, and properly reinforced on the folding and out- side edges. Separate loops for each instrument and protecting flaps keep the instruments in place and well protected. A button- clasp fastens the case when folded up. 14026. Dissecting Set. Consisting of the following instruments, in lined leatherette one-fold case, with protecting flaps: Each $1.25 I Scalpel, No. 13936; ebony handle, edge 38 mm. I Scissors, No. 13982; medium straight. I Forceps, No. 13794; blunt. 1 Forceps, No. 13792; fine, curved points. 2 Needle Holders, No. 13836; length, 85 mm.; fitted with needles. 14028. Dissecting Set. Consisting of the following instruments, in ilorocco leather one-fold case, with velvet lining and protecting flaps: Each $2.25 I Scalpel, No. 13918; ebony handle, edge 38 mm. I Scissors, No. 13980; medium, straight, nickeled. I Forceps, No. 13778; medium fine, curved points. 1 Forceps, No. 13780; medium heavy; straight points. 2 Needle Holders, No. 13836; length, no mm.; fitted with needles. Special sets made up to order- New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 181 14030, 14032. 14034. 14036 14030. Dissecting Set. Consisting of the following instruments, in lined leatherette two-fold case, with cloth protecting flaps: Each $2.25 I Scalpel, No. 13934; ebony handle, edge 45 mm. I Scalpel, No. 13940; ebony handle, edge 25 mm. I Scissors, No. 13982; medium, straight. I Forceps, No. 13788; heavy, straight, for vertebrate work. I Tenaculum, No. 14022. I Cartilage Knife, No. 13814; all steel, edge 45 mm. I Triple Chain and Hooks, No. 13808. I Blowpipe, No. 13749. 14032. Dissecting Set. Consisting of the following instruments, in Morocco leather two-fold case, with velvet lining and chamois skin protect- ing flaps: Each $3.50 I Scalpel, No. 13916; ebony handle, edge 45 mm. I Scalpel, No. 13922; ebony handle, edge 25 mm. I Scissors, No. 13980; medium, straight, nickeled. I Forceps, No. 13788; heavy, straight, for vertebrate work. I Tenaculum, No. 14022. I Cartilage Knife, No. 13812; all steel, edge 45 mm. I Seeker, No. 14004. I Triple Chain and Hooks, No. 13808. [ Blowpipe, No. 13749. 14034. Dissecting Set. Consisting of the following instruments, in lined leatherette two-fold case, with cloth protecting flaps: Each $3.25 I Scalpel, No. 13934; ebony handle, edge 45 mm. I Scalpel, No. 13940; ebony handle, edge 25 mm. I Scissors, No. 13964; fine, straight. I Scissors, No. 13982; medium, straight. I Forceps, No. 13792; fine, curved points. I Forceps, No. 13794; medium, blunt points. •■ Needle Holders, No. 13836; length, 85 mm,; fitted with needles. I Section Razor, No. 13866; folding handle. Special sets made up to order- jg2 Bausch & Loitib Optical Co., Rochester, N. Y., U. S. A., 14038, 14040 14036. Dissecting Set. Consisting of tiie following instruments, in Morocco leather two-fold case, with velvet lining and chamois skin protect- ing flaps: Each $5.00 I Scalpel, No. 13916; ebony handle, edge 45 mm. I Scalpel, No. 13920; ebony handle, edge 32 mm. I Scissors, No. 13964; fine, straight, nickeled. I Scissors, No. 13980; medium fine, straight, nickeled. I Forceps, No. 13778; medium fine, curved points. I Forceps, No. 13780; medium heavy, straight points. ' Needle Holders, No. 13836; length, no mm.; fitted with two needles. I Section Razor, No. 13864; folding handle. 14038. Dissecting Set. Consisting of the following instruments, in Morocco leather two-fold case, with velvet lining and chamois skin protect- ing flaps: Each $5.00 I Scalpel, No. 13926; all steel, edge 45 ram. I Scalpel, No. 13930; all steel, edge 32 mm. I Scalpel, No. 13932; all steel, edge 25 mm. I Scissors, No. 13964; fine, straight. I Scissors, No. 13975; heavy, straight, 140 mm. long. I Forceps, No. 13788; for vertebrate work. I Forceps, No. 13782; heavy, straight, 115 mm. long. I Cartilage Knife, No. 13812; all steel, edge 45 mm. I Tenaculum, No. 14024. (Continued on page 184.) Special sets made up to order. New York, Boston- 'Oacago, U. S. A., Frankfurt a/JI., Germany. 183 14043 I Seeker, No. 14004. I Triple Chain and Hooks, No. 13808. ; I Blowpipe, No. 13749. 14040. Dissecting Set. Consisting of the following instruments, in Morocco leather three-fold case, with velvet lining and chamois skin pro- tecting flaps: Each $8.00 I Scalpel, No. 13926; all steel, edge 45 mm. I Scalpel, No. 13930; all steel edge, 32 mm. I Scalpel, No. 13932; all steel, edge 25 mm. I Scissors, No. 13964; fine, straight, nickeled. I Scissors, No. 13966; fine, curved. I Scissors, No. 13972; medium, straight, probe point. I Forceps, No. 13788; for vertebrate work. I Forceps, No. 13780; medium heavy, straight, 115 mm. long. I Forceps, No. 13784; heavy, straight, 130 mm. long. I Cartilage Knife, No. 13812; all steel, edge 45 mm. I Tenaculum, No. 14024. I Seeker, No. 14004. I Triple Chain and Hooks, No. 13808. I Blowpipe, No. 13749. 3 Serrafines (Artery Forceps), No. 13750. 14041. Dissecting Set, Botanical. Designed and recommended by Prof. W. F. Ganong. This set embraces just those instruments deemed essential in plant analysis, viz.: A two-lens magnifier, two dissect- ing needles, one fine forceps, and one scalpel. These are enclosed in a strong, leather-covered case of such shape and size as to be easily carried in the pocket. The case serves also to support the lens when flat with the high power in focus, when on its edge with the low power in focus, so that the whole forms a fair dissecting microscope. Each $1.75 14042. Dissecting Set as designed by Prof. B. P. Colton. and recommended' by him in his book entitled, " Practical Zoology." The set is; composed of the following instruments, in lined leatherette one- fold case, with protecting fiaps: Each $1.75 I Scalpel, No. 13936; ebony handle, edge 38 mm. I Scissors, No. 13980; medium, straight. I Forceps, No. 13788; heavy, straight points. I Cartilage Knife, No. 13812; all steel, edge 45 mm. 1 Blowpipe, No. 13749. 2 Needle Holders, No. 13836 (85 mm.); with straight needles. Special sets made up to order. 184 Bausch 6- Lomb Optical Co., Rochester, N. Y., U. S. A., 14045 Dissecting Sets, Johns Hopkins University. Sets Nos. 14043 and 14044 are used in the laboratories of Johns Hopkins University, and are selected with a view of securing the best quality, most effective apparatus regardless of cost. The knives, forceps, scis- sors, probe, hook, etc., are special shapes not found in the market, and made to order for these sets only. They are not listed else- where in this catalogue, but will be furnished separately on order. Furnished in velvet-lined, leather-covered box with catch. 14043. Dissecting Set, Johns Hopkins Anatomical. Consisting of the fol- lowing instruments, in Morocco leather covered box, with velvet lining: .. Each $5.00 I Scalpel, No. 13916; ebony handle, edge 45 mm. I Scalpel (Special); ebony handle, edge 38 mm. I Scalpel (Special) ; ebony handle, edge 32 mm. I Scalpel (Special) ; ebony handle, edge 25 mm. I Scissors (Special); heavy, straight, very fine metal; blades, 40 mm.; total length, 140 mm. I Forceps (Special); heavy, straight, coarsely serrated points; length, 140 mm. I Probe (Special); coarse, all steel octagonal handle; length, 14s mm. I Dissecting Hook (Special) ; double end, two points on each end. 14044. Dissecting Set, Johns Hopkins Histological. Consisting of the fol- lowing instruments, in Jlorocco leather covered box, with- velvet lining : Each $3.75 I Scalpel (Special) ; handle, edge 25 mm. I Scissors, No. 13964; fine, straight. (Continued on page 186.) Special sets made up to order. J^ew York, Bo5lon, Chicago, U. S. A., Frankfurt a/M., Germany. 185 ■^ 14052, 14054 14056, 14058 14045. 14046. 14048. 14050, 14052 186 I Forceps (Special); straight, heavy, with fine, smooth points, very accurately adjusted. 1 Lancet Needle (Special); double blade, ebony handle. 2 Teasing Needles (Special) ; straight, ebony handle. I Section Lifter, No. 13998; blade, 20 mm.; ebony handle. Distilling Apparatus. See Stills, Flasks, Tubes. Droppers. See Pipettes, Bottles. Drying Apparatus. After Bender and Hobein for elementary chem- ical analysis. Complete on polished wooden base. (See page 185.) Each $13.50 Drying Apparatus, Bennert's. (See page 185.) Each Drying and Washing Apparatus, Glazer's. Each Drying Apparatus, Tauber's. Each Drying Cylinders. See Chloride Calcium Cylinders. Drying Ovens, Single Wall. Made of heavy polished copper with extra sheet iron bottom to prevent burning out. Provided with tubulatures for thermometer and gas regulator, and supported on detachable iron legs. Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., $9-75 $10.00 $12.00 14060, 14062 14066 14064 Height, without legs, mm. 150 200 250 Length, mm. 200 250 300 Width, mm. 150 200 250 Removable shelves i i 2 Each 4.50 6.00 8.00 14054. Drying Ovens, Single Wall. With enclosed base. Each 4.50 6.00 8.00 14056. Drying Ovens, Double Wall. Iilade of heavy copper throughout, with an extra sheet iron bottom to prevent burning out. Pro- New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 187 14070 14068 14072 vided with tubulatures for thermometer and gas regulator, and supported on detachable iron legs. (See illustration, page 186.) Height, without legs, mm. 150 200 250 Length, mm. 200 250 300 Width, mm. 150 200 250 Removable shelves 112 Each 7-50 9-50 14058. Drying Ovens, Double Wall. With enclosed base. Each 7.50 9.50 12.00 14060. Drying Ovens, Double Wall. Same as No. 14056, but with water bath top. (See illustration, page 187.) Height, without legs, mm. 150 Length, mm. 250 Width, mm. 150 Removable shelves i 200 250 250 300 200 250 I 2 Each 12.00 15.00 14062. Drying Ovens, Double Wall. With enclosed base. Each 10.00 12.00 15.00 14064. Drying Oven, Fresenius'. A single-wall oven made of heavy pol- ished copper, with sheet iron back and base. Partitioned into three chambers, each 175x175 mm. and provided with movable shelves, doors with ventilators, and tubulatures for thermometer and gas regulator. Outside dimensions: Length, 525 mm.; height, 220 mm.; depth, 175 mm. May be hung upon the wall. Each $20.00 14066. Drying Oven, Rammelsberg's. Cylindrical. Made of polished cop- per. Height, 150 mm.; diameter, 125 mm. Each $2.50 14068. Drying Oven, Royal Berlin Porcelain. With openings in top for thermometer and ventilation. One shelf. Height, 120 mm.; diam- eter, 95 mm. Each $3.00 14069. Drying Plate. For drying blood films. A heavy copper plate, 300x100x6 mm., to be supported on tripod. Each $4.00 14070. Drying Tubes, Liebig's. Each $0.25 14072. Drying Tubes, Mitscherlich's. Each $0.30 Other Drying Tubes. See Chloride Calcium Tubes. Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., i4ogo 14082, 14084 14088 14086 14092 [ 14074 14076 Elastic Bands. See Rubber Bands. 14074. Embedding Box. For use in embedding objects in paraffin. Consists of two metal L's with metal plate. Various sized objects may be embedded by placing the L's in different positions. Height, mm. 10 20 30 Each .45 .45 .45 14076. Embedding Table. For use in embedding objects in paraffin. Con- sists of a triangular copper plate 400 mm. long and 190 mm. wide at the large end. A burner is placed under the acute angle of the plate, the heat being transmitted through the metal. Each $2.00 14078. Emery Cloth. Grade Fine Medium Coarse Per sheet 14080. Emery Paper. Grade .05 Fine •05 Medium .05 Coarse Per sheet .03 Ether Tubes. See Tubes. .03 .03 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 189 j4og6 1 41 04 14094 14100 1 41 02 14098 14082. Eudiometers, Bunsen's. With platinum electrodes. (See page 189.) Capacity, cc. 50 50 100 100 100 Graduated, cc. 1-5 i-io i 1-2 1-5 Each 1.65 2.25 2.50 14084. Eudiometers, Bunsen's. Graduated in millimeters. Graduated, mm. 300 500 700 800 Each 1.65 2.00 2.50 3.25 Eudiometers, Hoffman's. See Hoffman's Lecture Apparatus. 14086. Eudiometers, Mitscherlich's. With glass stop cock and platinum electrodes. (See illustration, page 189.) Capacity, cc. 50 100 Graduated, cc. _ 1-5 l-S Each 3-00 3.50 190 Bausch &■ Lomb Optical Co.. Rochester, N. Y., U. S. A., I4I05 I4I06 14088. Eudiometers, Ure's. Graduated in cubic centimeters. With plat- inum electrodes. (See illustration, page 189.) Capacity, cc. 50 100 Graduated, cc. 1-5 1-2 Each 2.00 2.00 Other Eudiometers. See Gas Me.^suring Tubes. 14090. Extraction Apparatus, Drechsel's. New form; fitted with corks. (See illustration, page 189.) Capacity, cc. 100 250 Each .80 1.15 14092. Extraction Apparatus, Soxhlet's. Of clear white glass. (See illus- tration, page 1S9.) Capacity, grams 60 100 150 200 Each 1.15 1.50 2.00 2.25 14094. Extraction Apparatus, Soxhlet's. Complete with fiask and condenser. Capacity of flask, cc. 100 150 200 Each 2.25 2.50 3.50 14096. Extraction Apparatus, Soxhlet's. With ball condenser of brass, nickel plated. Capacitj', 100 cc. Each $5.00 14098. Extraction Apparatus, Soxhlet's. With ground joints. Capacity. 100 cc. Each $5.00 14100. Extraction Apparatus, Thorn's. Height, mm. 180 240 330 Diameter, mm. 30 40 55 Each 2.40 4.00 7.00 14102. Extraction Apparatus, Wiley's. A glass tube, with ground flange, containing a metal condenser and suspended porcelain Gooch crucible. No stoppers of any kind are required. Permits double weighing, both of residue and extracted matter. Each $5.00 Extraction Apparatus. Other kinds to order. New York, Boston, Chicago, U. S. -\., Frankfurt a/M., Germany. 191 I4I29 I4I28 14130 1 41 26 14118 14104. Extraction Thimbles. Of fat-free Schleicher & Schuell paper; for use with extraction apparatus. The use of these tubes renders it impossible for any of the material being extracted to find its way into the solvent. Seamless; may be used repeatedly. Length, mm. 77 80 80 90 94 123 Diameter, mm. 30 22 33 19 33 43 Per package of twenty-five 2.00 1.85 2.00 1.85 2.75 4.25 Extraction Paper. See Milk Testing Apparatus. 14105. Farinatom, Heinsdorf's. For determining the percentage of flour in malt and grain. (See illustration, page 191.) Fermentation Tubes. See Urinary Apparatus. 14106. Figures. Of steel; for stamping steel, iron, bullion, etc. Set of nine. Face, mm. 1^4 3 4j4 6 Per set .80 .90 14108. Files, Flat. Best quality. Length, mm. 75 10 Each .20 .2 I2S 1.25 150 8 I. SO I7S 2.50 •25 .28 .30 •35 192 Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. A. Each .12 •15 .20 •25 .28 •30 Files, Triangular. For cutting glass tubing; best qu lality. Length, : mm. 75 100 125 150 175 200 Each .20 .20 •25 .28 •30 ■35 Files, Cork. With fine points for perforating : corlc-. Length, mm. 7S 100 125 ISO 200 14110. Files, Round. (Rat tail); best quality. Length, ram. 75 100 125 150 175 14112. 14114. Each .12 .15 .20 .25 .30 14116. File Handles. Best quality. Each $0.05 FILTERS, BERKEFELD These filters give a continuous flow of perfectly pure water in large or small quantities according to pressure. The filtered liquid is absolutely free from germs or any solid particles. The filter cylin- der is made of infusorial earth and can be cleaned easily as all im- purities remain on its surface from which they must be removed by a sponge or soft brush. All jJarts are detachable to admit of frequent cleaning and sterilizing. 14118. Filters, Berkefeld Laboratory. These filters are neatly nickel plated and designed to be screwed to any regular 18 mm. hose bib faucet. A two-way cock may be used which enables either filtered or un- filtered water to be drawn without removing the filter. (See page 192.) Size, mm. 150x80 230x60 290x60 Each, Net 4.00 6.00 8.00 14120. Cylinder for renewal for Xo. 141 18. Each, Net 1.50 2.00 2.50 14122. Two-way stop cock for No. 141 18. Each, Net $2.00 14124. Wrench for opening filter No. 141 18 for cleaning. Each, Net $0.50 14126. Filters, Berkefeld Medical or Laboratory. For use where liquids are to be sterilized, or beef tea, infusions, or antitoxins are to be made. Yield a clear, sterile blood serum and eliminate all fat from milk so as to make a perfectly clear milk serum. Price includes mantel and cylinder. (See illustration, page 192.) Size Small iledium Large Each, Net 2.00 4.25 5.35 14128. Filter, Berkefeld, Physicians. With hand pump; for use in sick rooms where a small quantity of pure water is wanted for immedi- ate use. Capacity, one liter in eight minutes. In case. (See illus- tration, page 192.) Each, Net $8.00 14129. Filter, Chamberlain's. This filter gives a continuous flow of perfectly pure water in large or small quantity according to pressure. The filter cylinder is made of infusorial earth and may be easily cleaned, all parts of the filter being detachable. The case is nickel plated. The faucet is left uncut so that the filter may be attached to anj' size pipe. (See illustration, page 192.) 14130. Filter, Chamberlain's. Consists of a glass receiver of 1000 cc. capa- city for the fluid to be filtered, a heavy glass flask with side neck New York. Boston, Chicago, U. S. .\., Frankfurt a/M., Germany. IQ-I 1 41 44 1 41 36 1 41 42 for connecting the exhaust pump, and an unglazed porcelain tube through the wall of which the fluid is filtered. The Chapman Air Pump is suitable for use with this filter. (See page 192.) Each $2.50 14132. Filter, Chamberlain's. With Chapman's Air Pump, No. 12034, No. i. Each $4.00 14134. Filter Tubes. Of porcelain; for Chamberlain's Filter. Each $0.20 14136. Filter, Kitasato's. Same as No, 14130 except the shape of flask. Each $2.50 14138. Filter, Kitasato's. With Chapman's Air Pump, No. 12034, No. I. Each $4.00 14140. Filter Tubes. Of porcelain; for Kitasato's Filter. Each $0.20 14142. Filter, Double Exhaust. For obtaining separate filtrates. Consists of two exhaust flasks connected with a glass reservoir by glass tubes and a two-way stop cock. Each $8.00 14144. Filter, Muencke's. This apparatus has a porcelain cylinder fitting air- tight in a glass receiver and is suitable for filtering fluids under pressure. The receiver has side neck for connecting with air pump, and outlet near bottom with glass stopper; not shown in illustra- tion. Is easily sterilized. Capacity, 150 cc, Each $2.75 194 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14X50 1 41 47 1 41 52 14147. 14148. 141 50. 14152. Filters, Pukal's. Ballonn Filter?. Capacity, cc. 50 Each .40 •75 Filter Apparatus. For filtering volatile liquids. Consists of a funnel with ground on cover,- ground into receiver. (See page 194.) Capacity, cc. 50° 1000 Each 2.25 2-75 Filter Apparatus. Consists of a glass plate and an open top bell glass fitted with rubber stopper and funnel. Without beaker. Each $2.00 Filter Apparatus. Similar to No; 14150 except that bell glass has tubulature near bottom for connection with exhaust pump. With- out beaker. Each $2.25 14154. Filter Bags. Felt. (See illustration, page 194.) Capacity, liters 4 5 6^ Size, mm. 280x300 330x380 350x400 400x480 Each i.io 1.25 1.60 i.go Filter Cones. Platinum. See Pl.^tixcm Filter Cones. 14156. Filter Drying Bath. Porcelain; for drying precipitates on the filter. (See illustration, page 194.) Each $1.80 Filter Flasks. See Flasks. 141 58. Filter Hooks. Of glass; for use in funnels. Size of funnel, mm, 125 150 200 250 300 Per ten •50 .60 .70 .80 .90 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 195 14160-14166 I4I60. I4I62. 14164. Filter Paper. In addition to regular lines listed on the following pages, we offer the B. & L. Ai brand, as a paper of good filtering quality at a moderate price. This paper is made abroad, where climatic conditions are favorable to its manufacture, and will be supplied in light and medium weights (similar to S. & S. S9S and 597) in sheets and circles as listed below. All cut Alters are put up 100 filters each in neat strong cardboard boxes. Filter Paper, B. & L. Ai. Light weight. Circular filters. Diameter, mm. 55 70 go no 125 150 Per hundred filters .10 .12 .15 .18 .20 Diameter, mm. 185 240 270 320 385 •25 Per hundred filters .35 Filter Paper, B. & L. Ai. Filter Paper, B. & L. Ai. Diameter, mm. SS •50 •75 1.25 Per hundred filters Diameter, mm. •15 185 Light weight. In sheets, 450 x 550 mm. Per hundred sheets $1.35 Medium weight. Circular filters. 70 90 no 125 150 .40 .18 240 .20 270 ■25 320 .30 38s Per hundred filters .50 .75 i.oo 1.25 1.50 14166. Filter Paper, B. & L. Ai. Medium weight. In sheets, 450 x 550 mm. Per hundred sheets $1.75 Filter paper, B. & L. Put up in packages of 100 filters under our own trade mark and found by tests to be equal to higher priced papers. 14168. Filter Paper, B. & L. White. Circular filters. Diameter, mm. 55 70 90 no 125 150 Per hundred filters .06 Diameter, mm. 185 .08 .10 .12 ■15 .18 240 270 320 385 SCO Per hundred filters .20 •35 •SO •75 1.25 196 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14168*14176 14172. I4I74- 14176- 14178. 14180. 1 41 82. Filter Paper, B. & L. White. In sheets, 480x480 mm. Per hundred sheets $1.10 Filter Paper, B. & L. Gray. Circular filters. Tough and durable. Diameter, mm. 150 190 250 330 400 450 500 14184. Per hundred filters .20 .25 •35 -SO -65 -75 Filter Paper, B. & L. Gray. In sheets, 500 .x 500 mm. Per hundred sheets .90 $0.75 Filter Paper, Baker & Adamson's. Washed in hydrochloric acid. (Single washed). Diameter, mm. 55 70 90 no 125 150 Per hundred filters .18 .36 .54 .65 .75 i.oo Filter Paper, Baker & Adamson's. Selected thin paper. Washed in hydrochloric and hydrofluoric acid (Double washed). Diameter, mm. 55 70 90 no 125 150 1.20 Per hundred filters .80 .40 .50 .65 Filter Paper, Baker & Adamson's. Selected thick paper. Wash'-.d in hydrochloric and hydrofluoric acid (Double washed). Diameter, mm. 55 70 90 no 125 150 Per hundred filters .40 .50 .65 .80 i.oo 1.20 Filter Paper, Munktell's Swedish. Put up, five packages of 100 filters each, in birch bark boxes which protect the paper from injury by dust or moisture, and serve as excellent containers in the laboratory. Filter Paper, Munktell's No. 00. For special scientific work. Washed in hydrochloric and hydrofluoric acid. Diameter, mm. 55 70 90 no 125 150 Ashes, gram .000011 .000018 .000030 .000045 .000058 .000083 Per hundred filters ■SO •55 .80 1.25 New York, Boston, Chicago, U. S. A., Frankfurt a/il., Germany. 197 14184-14196 14202, 14204 14186. Filter Paper, Munktell's No. 0. Washed in hydrochloric acid, remov- ing traces of iron, alumina, lime, etc. Diameter, mm. S5 7° 90 no Ashes, gram .00006 .00010 .00017 .00025 Per hundred filters .20 Diameter, mm. 125 Ashes, gram .00033 .27 .42 ISO I8S 00046 .00070 •55 Per hundred filters •63 85 1.25 14188. Filter Paper, Munktell's No. o. In sheets, 480 x 480 mm. Per ten sheets $0.85 14190. Filter Paper, Munktell's No. i F. Original Swedish, of best linen material. Most perfect filtering paper made. Leaves the smallest amount of ashes of any unwashed paper. Very strong; adapted to highest class of chemical work. Diameter, mm. 55 70 90 no Ashes, gram .00014 .00023 .00038 .00056 Per hundred filters .11 .16 •25 ■30 Diameter, mm. 125 ISO 185 Ashes, gram .00073 .00105 .00161 Per hundred filters .40 •50 •75 14192. Filter Paper, Munktell's No. 1 F. 14194. Filter Paper, Munktell's No. 2. thickness; rapid in filtration. Diameter, mm. 55 Ashes, gram .00018 In sheets, 480 x 480 mm. Per hundred sheets $4.00 A pure, white linen paper of medium A superior paper for laboratory use. 70 go 'no •.00030 .00051 .00074 26 Per hundred filters .10 •13 .20 Diameter, mm. 1 25 ISO i8s Ashes, gram .00095 .00138 .00209 Per hundred filters •31 .40 •53 198 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., I42I2 14196- Filter Paper, Munktell's No. 2. In sheets, 480x486 mm. Per hundred sheets $3.20 14x98. Filter Paper, S. & S. No. 575. Thin, hardened filters; especially adapted to use with filter pumps, and suitable for filtration of caus- tic liquids and strong acids. Diameter, mm. 40 55 70 90 no 125 150 Per hundred filters .48 .60 Diameter, mm. 185 240 .96 320 I-I5 385 1.30 500 Per hundred filters 2.00 3.00 14200. Filter Paper, S. & S. No. 588. Folded filters. Diameter, mm. 125 150 185 240 .64 270 4.00 4.90 6.40 10.40 320 385 1.50 500 Per hundred filters .36 •45 •55 .80 1.30 1.70 2.65 14202. Filter Paper, S. & S. No. 589. "Black Ribbon." Washed with h3'- drochloric and hydrofluoric acid. Filters quickly and retains the finest precipitates; prepared especiallj- for use in metallurgical . laboratories. Diameter, mm. 55 70 90 no 125 150 Ashes, gram .00004 .00007 .00011 .00017 .00021 .00025 Per hundred filters .60 •6S •95 i^i5 1.30 1.50 14204. Filter Paper, S. & S. No. 589. "White Ribbon." Washed with hy- drochloric and hydrofluoric acid. Filters quickly; retains the finest precipitates and leaves only the smallest amount of ashes. Diameter, mm. 55 70 90 no 125 150 Ashes, gram .00004 .00007 .00011 .00017 .00021 .00025 Per hundred filters .60 •65 •95 I-I5 1.30 1.50 14206. Filter Paper, S. & S. No. 590. Washed to the utmost limit in hy- drochloric and hydrofluoric acid. Diameter, mm. 55 70 90 no 125 150 Ashes, gram .00002 .00003 .00005 .00007 .00009 .00013 Per hundred filters .75 .80 1-45 1.60 New York, Boston, Chicago, U. S. -\., Frankfurt a/M., Germany. 199 14220 14222 14224 14226 14228 14230 14232 14208. Filter Paper, S. & S. No. 595. Thin, white paper; in packages of 100 filters. Diameter, mm. 55 70 90 I2S Per hundred filters Diameter, mm. .12 •15 .20 .22 •25 i8s 240 270 320 385 .30 I42IO. I42I2. Per hundred filters .40 .70 .95 i.io 1.35 Filter Paper, S. & S. No. 595. In sheets, 470 x 540 mm. Per hundred sheets $2.00 Filter Paper, S. & S. No. 597. Thick, white paper; in packages of 100 filters. Diameter, mm. 55 70 90 125 150 Per hundred filters Diameter, mm. .18 .20 ■25 •30 •35 .40 185 240 270 320 38s 500 I42I4. 1 421 6. 14218. Per hundred filters .55 Filter Paper, S. & S. No. 597. .80 2.80 .10 1.30 1.70 In sheets, 580 x 580 mm. Per hundred sheets $3-90 14220. Filter Paper, S. & S. No. 600. So-called drying paper. Recom- mended for drying salts and botanical preparations. Size, 340x420 mm. Per hundred sheets $1.20 Filter Paper. So-called bibulous paper. Heavy white paper with rough surfaces. Specially recommended for filtering culture media. This paper should not be confused with common bibulous paper. In sheets, 400 x 400 mm. Per hundred sheets $2.50 Filter Plates. See Plates. Filter Pumps. See Air Pumps. 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, mm. 125 175 225 300 Each .30 .40 •50 •75 14222. Filter Rings. Of porcelain. Two arms. Each $0.20 14224. Filter Rings. Three arms. Each $0.35 14226. Filter Stands. See Supports. Filter Tubes. See Tubes. Flasks, Assay. Bohemian Glass. Capacity, cc. SO 250 Each •15 .18 200 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14234 14236 14240 14228. 14230. 14232. 14234- Flasks, Assay. Bohemian Glass. Conical; high form. Capacity, cc. 50 100 250 500 Each .10 .15 .20 .25 Flasks, Assay. Bohemian Glass. With lip; for precipitation and filtration. Capacity, cc. 50 100 250 500 Each .10 .15 .20 .25 Flasks, Assay. Bohemian Glass. French form; with long neck. Capacity, cc. 25 50 100 Each .10 .12 .15 Flasks, Bacteriological. See Flasks, Culture. Flasks, Boiling. Baloc Glass. Flat bottom; vial mouth. Capacity, cc. 25 50 100 150 200 250 14236. 14238. 14240. Each Capacity, cc. .07 300 .08 400 .09 Soo .10 750 .12 liters I •14 Each Capacity, liters .16 1/2 .18 2 .20 3 •25 4 •30 8 Each Flasks, Boiling. Capacity, cc. .40 -SO Jena Glass. 50 100 .75 1. 00 1.50 Flat bottom; vial mouth. 200 300 400 soo Each Capacity, cc. .12 700 •15 liters I .20 •25 2 •30 3 ■35 Each Capacity, liters .40 ; 5 •50 6 .60 8 •75 10 1. 00 15 Each Flasks, Boiling. Capacity, cc. 1.25 1.75 Baloc Glass. ^5 2.25 With h. so 3.00 4,00 eavy ring neck to bear corkii 100 150 200 Each Capacity, cc. .07 250 .08 300 .09 400 .10 SOO .12 750 Each Capacity, liters .14 I .16 l'/2 .18 2 .20 3 •25 4 Each Flasks, Boiling. Capacity, cc. .30 Baloc Glass. 50 100 .40 .50 Round bottom 250 500 1 •75 iters I 1. 00 2 Each .08 .10 .14 .20 .30 .50 1. 00 Any of the above Aasks furnished H'ifh ground label for pencil notes. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 201 14242 14250 14258 14252 14256 14242. Flasks, Boiling. Jena Glass. Round bottom; vial mouth. Capacity, cc. 50 100 200 300 400 Each Capacity, cc. .12 500 .15 700 .20 1000 •25 .30 1500 14244. Each Flasks, Boiling. Capacity, cc. .35 Jena Glass. 50 100 .40 Round 200 .50 bottom; 300 .60 ring neck. 400 soo Each Capacity, cc. .15 .18 700 liters I .20 •25 2 .30 .35 3 Each Capacity, liters .40 -50 5 6 .60 8 .70 10 .95 15 14246. Each Flasks, Boiling. Capacity, cc. 1.20 1.75 Jena Glass. 50 100 2.25 3.00 Round bottom; 200 300 4.00 short ring neck. 400 soo Each Capacity, cc. .15 -iS 700 liters I .20 ■25 2 •30 .35 3 Each Capacity, liters .40 .50 5 6 .60 8 .70 10 •85 15 14248. Each 1.20 1.75 2.25 3.00 4.00 Flasks, Erlenmeyer Form. Baloc Glass. Narrow mouth. Capacity, cc. 25 50 100 150 200 Each Capacity, cc. .07 250 .08 300 .09 400 .10 .12 soo 750 Each Capacity, liters .14 I .16 1/2 .18 2 .20 .25 3 4 14250. Each Flasks, Erlenmey Capacity, cc. .30 .40 .50 .75 1. 00 er Form. Baloc Glass. Wide mouth. 25 50 100 ISO 200 250 300 Each .07 .08 .og .10 .12 Capacity, cc. 400 500 7S0 liters I 1V2 .14 .16 Each .18 .20 .25 .30 .40 .50 .75 Any of the above Hasks furnished ivith ground label for pencil notes. 202 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14266 A 14266 B 14252. Flasks. Erlenmeyer Form. Jena Glass. Capacity, cc. 50 100 150 14266 C 300 Each Capacity, cc. .10 450 .12 600 •15 850 .18 1 100 .20 2000 14254- 14256- 14258- 14260. 14262. Each .25 .35 .40 .50 .60 Flasks. Extra heavy glass; flat bottom; vial mouth; for wash bottles. Capacity, cc. 150 250 500 750 1000 Each .10 .15 .20 .25 .30 Flasks, Carbonic Acid. Light; low form; extra wide mouth. Capacity, cc. 25 50 100 Each .10 .12 .15 Flasks, Culture, Billing's. Of clear white glass; with stopper and cap. For gelatine and serum. (See illustration, page 202.) Capacity, cc. 100 230 500 Each .60 .75 1. 00 Flasks, Culture, Chamberlain's (or Pasteur's). For fluids; with cap ground on. Capacity, cc. 50 100 200 Each .30 .40 .60 Flasks, Culture, Chamberlain's, (or Pasteur's). With two side necks. Capacity, cc. 50 100 200 Each .75 .90 1.20 Any of the above Aasks furnished with ground label for pencil notes. New York, Boston, Chicago, U. S. A.. Frankfurt a/M., Germany. 203 14272 14276 14274 14264. Flasks, Culture, Erlenmeyer's (or Koch's). For bread and gelatine. Capacity, cc. 50 7$ 100 Each .07 .08 .og 14266. Flasks, Culture, Fernbach's Antitoxine. For diphtheria cultures. Of best clear white glass. Capacity, 2 liters. (See page 203.) Style ABC Each 1.50 3.00 2.50 14268. Flasks, Culture, Freudenreich's. With cap ground on. (See page 203.) Capacity, cc. 25 50 100 200 Each .35 .40 .50 .75 14270. Flasks, Culture, Freudenreich's. With side neck. Capacity, cc. 25 50 100 200 Each .40 .50 14272. Flasks, Culture, Listers'. For serum. Capacity, cc. 500 750 .60 .85 Each .75 1. 00 1.25 14274. Flasks, Culture, Miquel's. With flat bottom and ground-on cap; for use with bacterial counting apparatus. Capacity, cc. 50 75 100 Each .35 .40 14276. Flasks, Culture, Pasteur's Pipette. Capacity, cc. 125 250 500 •45 Each .35 .45 .60 .80 14278. Flask, Culture, Roszahegzi's. Plain; with thin parallel walls. Each $0.25 14280. Flask, Culture, Roszahegzi's. Graduated in square centimeters over one-half of the surface. Each $0.75 Any of the above flasks furnished with ground label for pencil notes. 204 Bausch & Lomb Optical Co., Rocliester, N. V., U. S. A., 14290 14292 14294 14282. Flask, Culture, Roszahegzi's. Graduated in square centimeters over entire surface. Each $0.75 14284. Flask, Culture, Sternberg's. For serum; a thin flask of clearest white glass, with neck drawn to a point. Capacity, 25 cc. Each $0.10 Flasks, Digesting and Dissolving. See Gas Apparatus, Kjeldahl. Flasks, Distilling, Copper. See Retorts, Copper, 14286. Flasks, Distilling (or Alembics). Of thin blown glass; head and flask in one piece. (See illustration, page 204.) Capacity, cc. 125 250 Each •55 .80 14288. Flasks, Distilling (or Alembics). With head ground air-tight into flask. (See illustration, page 204.) Capacity, cc. 125 250 Each .80 14290. Flasks, Distilling. Baloc Glass. With side tube high on neck. Capacity, cc. 30 60 100 250 500 1000 2000 Each •IS 14292. 14294. 14295. 14296. ) .25 .30 .40 .55 .75 Flass, Distilling. Baloc Glass. With side tube at center of neck. Capacity, cc. 30 60 100 250 500 1000 2000 Each .15 .20 .25 .30 .40 .60 .75 Flasks. Distilling. Baloc Glass. With side tube low pn neck. Capacity, cc. 30 60 100 250 500 1000 2000 Each .15 .20 .25 .30 .40 .60 .75 Flasks, Distilling. Baloc Glass. With side tube, 400 mm. long, at center of neck. (See illustration, page 206.) Capacity, cc. 30 60 100 250 500 1000 2000 Each .20 .25 .30 .35 •50 .60 .85 Flasks, Distilling. Jena Glass. With side tube. Capacity, cc. SO 100 200 500 1000 Each .25 .30 .35 .55 .80 Any of the above Aasks furnished with ground label for pencil notes. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 205 14300 14298 I429S . 14296 14298. Flasks, Distilling, Hoffmann's. Baloc Glass, For distilling in a gas current. Capacity, cc. 30 60 125 250 500 1000 Each .18 .20 .25 .35 .50 .80 14300. Flasks, Distilling. Baloc Glass. With side tube bent at right angle. Capacity, cc. 125 250 500 Each .25 .40 .55 X4302. Flasks, Distilling, Kreuzler's. Baloc Glass. With inside condenser. Capacity, cc. 250 500 1000 Each .60 .go 1.25 14304. Flasks. Distilling, Ladenburg's. Baloc Glass. With bulbed neck. Capacity, cc. 100 250 500 1000 Each .40 .60 .80 i.io 14306. Flasks, Distilling, Ladenburg's New Form. Baloc Glass. (See page 207.) Capacity, cc. 100 200 250 500 Bulbs 3 3 4 4 Each 2.30 2.60 3.00 3.50 14308. Flasks, Distilling, Lunge's. Baloc Glass. (See page 207.) Capacity, cc. 60 125 250 500 Each i4o ^60 .70 igo Any of the above Hasks furnished with ground label for pencil notes. _-../! Bausch & Lomb Optical Co., Rochester, y. V., V. S. A.. I43IO I43I8 I43i6 14312 14320 14304 14314 14306 14308 14310. Flasks, Filtering, Bunsen's. Conical ahape; of heavy white glass. Capacity, cc. 250 500 750 1000 2000 Each .25 .35 .45 .60 1.05 14312- Flasks, Filtering, Bunsen's. With side neck. Capacity, cc. 250 500 750 1000 2000 Each .40 .45 .60 .80 1.25 14314- Flasks, Filtering. Round form; with side neck. Capacity, cc. 250 500 1000 Each .35 .45 .80 I43I6. Flasks, Filtering. Water bottle shape; with side neck. Capacity, cc. 250 500 750 1000 2000 Each .45 .70 .90 1.05 1.30 I43I8. Flasks, Filtering. With funnel ground into neck and vvltl Capacity, cc. 250 500 1000 2000 Each 1.75 2.00 2.7s 3.50 Flasks, Generating (So-called Gas Bottles). See G.^s Bottles. 14320. Flasks, Joliet. Heavy glass; for use in iron and steel analysis. Capacity, cc. 500 1000 2000 Each .30 .45 .60 Any of the above flasks furnished i^'ith ground label for pencil notes. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 207 14322 14324 I432I 14328 14332 14336 14342 14338 1434° Flask, Johnson's. Designed by C. M. Johnson. Especially intended for dissolving steel in sulphur determinations. A good flask for general use. Has fire-finish ring-neck of uniform diameter, taking No. 6 rubber stopper. Capacity, 275 cc. to base of neck; height, 165 mm. Each $0.25 Flasks, Kjeldahl. See Gas Apparatus, Kjeldahl. Flasks, Precipitating. See Beakers, Phillip's. FLASKS, VOLUMETRIC FOR GENERAL LABORATORY WORK Our volumetric flasks for routine laboratory work are of superior quality, being made under our own supervision and carefully tested. They are adjusted by accurate measurement with water at is° C. 14322. Flasks, Volumetric (or Liter Flasks). Accurately graduated, with one mark on neck. Graduated for pouring out. Capacity, cc. s 10 25 50 loo ^5 Each Capacity, cc. .10 200 .12 250 .18 300 .20 500 Each Capacity, liters, ■30 I .40 2 •45 3 •SO 6 Each .65 1. 00 1.60 3.00 Any of the above ilasks furnished with ground label for pencil notes. 208 Bausch &■ Lomb Optical Co., Rochester, M. Y., U. S. A.. m 500 crro \ 14344. 14346 14348, 14350 14324. Flasks, Volumetric. Capacity, cc. 14326. With ground glass stopper. (See page 208.) S 10 25 50 100 Each Capacity, cc. .18 200 .20 250 •25 300 ■30 SCO •35 Each Capacity, liters •45 •50 2 ■55 3 .60 6 Each .80 1.20 2.00 4.00 Flasks, Volumetric. Jena Glass. Without graduation; the indicated capacity falls in the neck. Capacity, cc. 50 100 125 200 250 500 1000 Each 14328. Flasks, Volumetric. 208.) Capacity, cc. .22 .23 .24 .30 .40 .55 .70 Jena Glass. Graduated. (See illustration, page 50 I2S 200 250 500 1000 Each .30 .32 .35 .42 .55 .75 1. 00 14330. Flasks, Volumetric. Jena Glass. With ground glass stopper; with- out graduation; the indicated capacity falls in the neck. Capacity, cc. 125 250 500 1000 Each .50 .66 .95 1.15 14332. Flasks, Volumetric. Jena Glass. Graduated; with glass stoppers. Capacity, cc. 125 250 500 1000 Each .70 .95 1.35 1.55 i4334^ Flasks, Volumetric. So-called Sugar Flasks; with two graduations. Marked capacity, cc. 50 and 55 100 and no 200 and 220 Each ^28 ;35 ~^ Any of the above flasks furnished icith ground label for pencil notes. New York, Boston, Chicago, U. S. A.. Frankfurt a/M.. Germany. 20Q 14336. Flasks, Volumetric. With two marks on neck, for receiving and de- livering exact quantities. (See illustration, page 208.) Capacity, cc. 50 100 250 500 1000 Each .25 .30 .50 .60 .90 14338. Flasks, Volumetric. Witii ground glass stopper. (See page 208.) Capacity, cc. 50 100 250 500 1000 Each .30 .35 .55 .75 1.05 14340. Flasks, Volumetric, Giles'. For making normal solutions. (See page 208.) Capacity, cc. 50/5 100/10 250/25 500/50 looo/ioo 2000/200 Each .60 .70 .95 1.40 1.80 2.75 14342. Flasks, Volumetric, Kohlrausch's. Graduated; for saccharometric polarization. Capacity, cc. 50 100 200 Each .30 .35 .55 FLASKS, VOLUMETRIC FOR LABORATORY WORK OF PRECISION These flasks are graduated by weight on delicate balance. They are standardized to meet the requirements of the German Imperial Commission. A certificate of accuracy is supplied with each instrument. (See illustrations, page 209.) 14344. Flasks, Volumetric. Without stopper; adjusted for receiving. Capacity, cc. 25 50 100 200 250 500 1000 2000 Each .35 .40 .50 .60 .80 1. 00 1.30 2.00 14346. Flasks, Volumetric. Without stopper; adjusted for delivering. Capacity, cc. 25 50 100 200 250 500 1000 2000 Each .35 .40 .50 .60 .80 i.oo 1.30 2.00 14348. Flasks, Volumetric. With ground glass stopper; adjusted for receiv- ing. Capacity, cc. 25 50 100 200 250 500 1000 2000 Each .50 .60 .70 .90 I.oo 1.20 1.60 2.40 14350. Flasks, Volumetric. With ground glass stopper; adjusted for deliv- ering. Capacity, cc. 25 50 100 200 250 500 1000 2000 Each .50 .60 .70 .90 I.oo 1.20 1.60 2.40 We will supply these flasks (on import orders only, and at higher prices) tested by the German Imperial Commission, whose endorse- ment of accuracy is stamped upon each instrument. Prices on ap- plication. Floats, Erdmann's. See Burette Floats. Foil. See Platinum and Tin. 14352. Forceps. Of brass; straight. Each $0.15 14354. Forceps. Nickel plated. Each $0.15 14356. Forceps. Of brass; bent. Each $0.15 14358. Forceps. Nickel plated. Each $0.15 14360. Forceps. Of brass; with ivory tips. Each $0.70 14362. Forceps. Nickel plated. Each $0.70 14364. Forceps (Goosenecks). Of brass, nickel plated. Will not corrode. Length, 150 mm. Each $0.45 210 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14364 I43S6 14376 14360 14366 14368 1437° 14372 14366. Forceps. Of steel; plain. Length, mm. 75 I2S 150 Each .08 .08 .10 .18 Forceps, Dissecting. See Dissecting Instruments. Forceps, Platinum. See Platinum Ware. Fractional Distilling Flasks and Tubes. See Flasks and Tubes. Freezing Apparatus. See Ammoni.v Condensation Apparatus. 14368. Funnels, Agate Nickel Steel. Capacity (approx.), cc. 250 500 1000 2000 4000 Each .40 •SO .60 ■70 .90 14370. Funnels. Agateware. Flint ename ed; ac d proof. Capacity (approx.) cc. 250 500 1000 2000 4000 Each •SO .60 .70 .90 1.05 14372- Funnels, Copper. Capacity, cc. 125 250 500 1000 2000 Each .50 .65 .75 .95 1.25 14376. Funnels. Of clear white glas.?; plain; with stem ground to point; angle 60° Diameter, mm. 25 30 40 50 65 75 go 100 Each Diameter, mm. .07 120 .07 150 .07 170 .09 200 .10 225 .12 250 •14 300 .16 Each .18 •25 ^30 .40 .55 .75 i.oo New York, Boston, Chicago, U. S. A., Frankfurt a/M,, Germany. 211 14386 14392 14390 14378. 14380. Funnels. With edge ground even; angle 60°. Diameter, mm. 25 30 40 50 65 75 90 Each Diameter, mm. .08 120 .08 ISO .08 170 .10 200 .12 .14 225 250 .16 300 .18 Each .20 .25 .30 .45 .65 .85 1. 10 Funnels. Of clear white glass j exact angle 60°. Known as Bun- sen's funnels, having very thin and extra long stem for use with rubber stopper in filtering flask. Diameter, mm. 25 40 50 65 75 14382. Each .08 .08 .10 .12 .14 Diameter, mm. 90 100 no 120 150 Each .16 .18 .20 .24 .28 Funnels. With edge ground even. Diameter, mm. 25 40 50 65 75 Each .og .10 .11 .12 •IS Diameter, mm. 90 100 no 120 150 Each .18 .20 .22 .24 .30 14386. Funnels. Of clear white glass; ribbed; for rapid filtration; with stem ground to point; angle 60°. Diameter, mm. 50 65 80 100 120 150 170 200 14388. Each .09 .10 .12 .15 .18 .25 .28 .40 Funnels. With edge ground even; angle 60°. Diameter, mm. 50 65 80 100 120 150 170 200 Each .45 14390. 14392. .10 .12 .14 .18 .20 .25 .30 Funnels. Of clear white glass; fluted; the most rapid filtering fun- nel made. Diameter, mm. 70 i°° 1^° ^0° Each ^o 45 ^o 140 Funnels. Of clear white glass; with bulb; for filtering through glass wool. Diameter, mm. 100 150 200 Each .30 .45 .70 212 Bausch & Lomb Optical Co., Rochester, N. Y., u. S. A., 14394 14396 144°° 14404 14406 14408 I44IO 14394- Funnels, Porcelain. Plain; with handle. Diameter, mm. go 125 Each •3S .60 14396. Funnels, Porcelain. Ribbed; with handle. Diameter, mm. 90 125 Each 170 170 •45 -75 1-50 14398. Funnels, Porcelain. With large oval openings in sides. Diameter, mm. 100 120 150 Each .35 .50 1. 00 14400. Funnels, Porcelain. With perforated sides. Diameter, mm. 90 125 160 14402. 14404. Each .45 .65 1.20 Funnels, Porcelain. Small size; to be used as filter cones. Diameter, mm. 45 65 Each. .25 .35 Funnels, Porcelain, Buchner's. With fixed, perforated, porcelain plate. Diameter, mm. SO 80 100 150 200 Each .70 .90 1.05 1.25 1.75 2.10 2.50 14406. Funnels, Porcelain, Hirsch's. With fixed, perforated, porcelain ■plate. Diameter, ram. SO 70 90 125 140 160 1 4410. Each ■45 .60 75 1. 00 I^25 1.75 2.50 Funnels, Rubber. Vulcan zed. Capacity, cc. 100 250 500 1000 2000 Each •35 •45 .60 •75 2.00 Funnels, Tin. Capacity, cc. 1^5 250 500 1000 2000 4000 Each •15 •25 .40 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 213 I44i6> 1 441 8 14414 14412. Funnel, Hot Water. Of heavy polished copper; double wall; for hot filtration. On three iron legs. Each $4.50 14414. Funnel, Hot Water. In Bunsen ring burner attached to support. Each $4.50 14416. Funnel, Hot Water. Of tin; double wall. For hot filtration. (Ac- cording to Plantamaur.) Each $2.00 14418. Funnel, Hot Water. Of copper. Each $3.50 14420. Funnel, Hot Water or Steam. For filtering inflammable liquids. Complete as illustrated. Each $4.50 14422. Funnels, Separatory. Of clear white glass; angle 60°; stem ground to point. Diameter, mm. 100 125 150 180 200 240 Each 1.50 2.00 2.25 2.50 3.00 3.50 214 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14428 14434 14432 • 14436 14424 14424- Funnels, Separatory. Open top; bell shape. Capacity, cc. 50 75 100 Each .80 1. 00 1.25 14426. Funnels, Separatory. Open top; cylindrical. Capacity, cc. 30 50 100 150 200 250 Each .90 i.oo 1. 10 1.35 1.50 1.75 14428. Funnels, Separatory. With ground glass stopper. Capacity, cc. 30 50 100 150 200 250 Each 1.00 1.15 1.25 1.50 1.75 2.00 14430. Funnel, Separatory. Cylindrical; graduated. Has glass stopper with air-vent. Capacity, 100 cc. Each $1.60 14432. Funnel, Separatory. Pear shape; with ground glass stopper. Capacity, cc. 30 60 125 250 500 1000 2000 Each .90 I.oo 1.20 1.50 1.80 2.25 2.60 14434. Funnel, Separatory. Style 14432. With air-vent in stopper. Capacity, cc. 30 60 125 250 500 1000 2000 Each 1. 10 1.20 1.45 1.80 2.10 2.55 3.00 14436. Funnels, Separatory. Heavy glass; globe shape; with glass stopper. Capacity, cc. 250 500 1000 2000 4000 Each 2.00 2.25 2.50 3.00 4.00 14438. 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 labora- tories. Capacity, 160 cc. (See illustration, page 216.) Each $2.00 14440. Funnels, Separatory, Squibb's. With ground glass stopper. (See page 216.) Capacity, cc. 125 250 500 Each I.2S 2.60 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 215 14438 14440 14444 14446 14442 14448 14450 ^ 14452 14454 14456 14458 14460 14442. Funnel, Separatory or Dropping, Walter's. For examining single drops. Capacity, 60 cc. Each $1.30 14444. Funnels, Victor-Meyer. To suspend over evaporating dishes. Diameter, mm. 160 200 260 Each 1. 00 1.20 1.60 14446. Funnel Attachment. For use in iilling test tubes, flasks, etc. It avoids contact of fluid with the surface of vessel being filled, so that the latter remains clean for the insertion of cotton plug. Each $0.50 14448. Funnel Tubes. Straight; conical top. Length, mm. 200 250 300 400 Each .08 .14 216 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 14462 144^4 144^8 14472 14466 14470 14450- Funnel Tubes. Straight; thistle top. Length, mm. 200 250 300 400 Each 14452. .05 .00 .07 Funnel Tubes. With loop; conical top. Length, mm. 200 300 .08 400 Each .16 .18 14454. Funnel Tubes. With loop; thi.stle top. Length, mm. 200 300 400 Each •15 .16 14456. Funnel Tube. With loop; length 300 mm. One bulb; conical top. Each $0.20 14458. 14460. 14462. 14464. 14466. 14468. 14470. 14472. 14474- Funnel Tube. One bulb; thistle top. Funnel Tube. Two bulbs; thistle top. Funnel Tube. Tavo bulbs near top. Funnel Tube. Four bulbs; thistle top. Funnel Tube, Babo's. Funnel Tubes, Vogel's. Length, mm. 200 300 Each Each Each Each Each $0.20 $0.25 $0.25 $0.30 $0.60 400 Each .40 .45 .50 Funnel Tube, Welter's. Each $0.65 Funnel Tubes, Welter's. With two valves. Each $0.80 Furnace, Assay, Bosworth's. Made of fire clay; in three sections securely bound with heavy iron bands. Its construction is such that it is less liable to crack than other furnaces. Heats the mufifie quickly and evenly. (See illustration, page 218.) Size of muffle, mm. 200 x 350 225 x 375 250 x 400 Each, with i muffle, Net 35.00 40.00 40.00 New York, Boston, Chicago, U. S. A., Frankfurt a/^I., Germany. 217 1111 Ill mill ■ „„^«* iiii 14474 14476 14476. Furnace, Assay, Brown's. Made of fire clay and heavy sheet Can be used for both muffle and crucible work. Height, mm. 725 900 Width, mm. 400 525 Depth, mm. 350 45a Size of muffle, mm. 300x150x100 375x225x150 Weight, boxed, kilos 75 150 Each, Net 20.00 35.oo 14478. Furnace, Assay, "Jackass." JMade of fire clay, in one piece, securely bound with steel. Doors asbestos lined. This is a complete and satisfactory portable furnace. and very 218 Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. A., 14480. 1 44^2. 14484. 14486. Number Size of Weight, nuffle, kilos 14482 I 150 X 300 X 100 50 200 X 300 X 125 70 Each, with one muffle, Net 20.00 Furnace, Assay, "Jackass."' Extra grate for No. 25.00 14478. Each, Net $1.00 Furnace, Assayer's Combination. Designed by Walter Lee Brown and fully described in his " Manual of Assaying Gold, Silver, Cop- per, and Lead Ores." Consists of three furnaces; The one on the left for roasting sulphurets; the center one for crucible fusions, it taking a plumbago crucible 100 mm. deep by 95 mm. diameter, and the one on the right for scorification and cupellation. Com- plete with plumbago fittings, chimney pipe, horizontal gas pipe and three 10 mm. taps, as illustrated, but without rubber tubing or bench. Each $60.00 Bench with fire brick top, for No. 14482. Each $30.00 Extra taps, lo mm,, for No. 14482. Each $1.10 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 219 14488 14488. Furnace, Crucible, Fletcher's. This furnace will take crucibles up to 100 x9s mm. holding about 3 kilos when full, and with a 12-mm. gas pipe and pressure of gas equal to 50 mm. of water, supplying about IS meters per hour, will melt a crucible of gold, silver, or brass in about 30 minutes, and the same quantity of cast iron in about 60 minutes from the time the gas is lighted. Supplied with an improved burner giving a number of concentric flames. Fur- nace, with crucible 100x95 mm., cylinder, tongs, and 180 cm. of pipe. 14490. Plumbago crucibles, 100 x 95 mm., for No. 14488. 14492. Plumbago cylinders, for No. 14488. 14494. Fire clay casing, for No. 14488. 14496. Lid, for No. 14488. 14498. Grate, for No. 14488. 14500. Burner, for No. 14488. 14502. Wire gauze rings, for No. 14488. 14504. Furnace, Crucible, Fletcher's. This furnace consists of a simple pot for holding the crucible, with lid and a blowpipe burner, all mounted on a suitable cast iron base. The body is inade of mate- rial which is only one-sixth the weight of fire clay, and has not one-tenth its conducting power for heat. It requires only seven to twelve minutes, depending upon the gas supply and air pressure, to fuse perfectly 250 grams of cast iron. The crucible holds 300 grams of gold. A lo-mm. pipe supplying about one-fourth cubic meter (10 cu. ft.) of gas per hour, and Blower No. i2s88B or 12590B will produce sufficient blast for most purposes. Furnace, with one crucible 55x50 mm., without blower. Each $3.60 Each $19.20 Each $0.36 Each $1.20 Each $3.60 Each $1.07 Each $1.07 Each $9.60 Each $0.30 220 Bausch & Lomb Optical Co., Rochesler, N. Y., U. S. A., 14504 I4S28 1453° I45I6 1 4520 14506. Furnace body, for No. 14504. 14508. Furnace body and cover, for No. 14504. 14510. Burner, for No. 14504. 14512. Base, for No. 14504. 14514. Crucibles, 55 x 50 mm., for No. 14504. 14516. Furnace, Crucible, Fletcher's Improved. Of same construction as No. 14504, but with an improved gas burner of the same pattern as that used in the Perfected Injector Furnace, which is almost noiseless in action and is more economical than any gas burner heretofore used for heating furnaces. A lo-mm, gas supply pipe is required. Blower No. 12588B or 12590B is recommended with this furnace. Furnace, with one crucible 55 x 50 mm., without blower. Each $4.20 14526 m Each $0.90 Each $1.32 Each $1.20 Each $1.08 Each $0.24 New York, Boston, Chicago, U. S. A., Frankfurt a./'Sl., Germany. I453I i45i8- Burner, for No. 14516. Each Other extra parts for No. 14516, see Nos. 14506 to 14514. $1.70 14520. Furnace, Crucible, Fletcher's Kerosene. Burns refined petroleum or kerosene and is recommended as being fully equal in efficiency to the gas furnaces of similar construction. The burner is made on the principle of an atomizer, thus dispensing with a wick, and has oil and air regulators. Furnace, with one plumbago crucible 55 X 50 mm., without blower. (See page 221.) Each $5.40 14522. Kerosene burner, for No. 14520. Each $3.00 14524. Plumbago crucibles, 55 x 50 mm., for No. 14520. Each $0.24 Other furnace parts for No. 14520, see Nos. 15406, 15408, 1S412. 14526. Furnaces, Crucible, Hoskins'. Suitable for all kinds of crucible work; for melting assay charges, sample smelting charges, metals, etc. Round form. (See page 221.) Number i 2 Diameter, inside, mm. 100 125 Depth, inside, mm. 135 160 Each, Net 4.00 5-00 14528. Furnaces, Crucible, Hoskins'. No. 3 furnace; long form, taking two crucibles. Length of chamber, 170 mm.; height, 120 mm.; width, 100 mm. Each, Net $7.00 14530. Furnaces, Crucible, Hoskins'. No. 4 furnace; long form, taking four crucibles. A very effective furnace for large quantities of work. Length of chamber, 200 mm.; height, 150 mm.; width, 165 mm. (See page 221.) Each, Net $12.00 222 Bausch & Lonib Optical Co., Rochester, N. Y., U. S. A., 14532 I4S36 '"Iff' 14542 14531. Furnace, Electric, Sauveur and Whiting. The uses to which the fur- nace may be put are many. For any experimental work where definite and constant high temperatures are desired, it is invalu- able. It is particularly adapted to the heat treatment of metals, such as annealing, tempering, and hardening. It may also be used as a Combustion Furnace in chemical determinations, being espe- cially well adapted to the rapid ignition of the silicia residues in iron and steel combustion. Where available, we recommend the use of an electric current of 220 volts, though very satisfactory re- sults may be obtained with lower voltage. Each, Net $95.00 14532. Furnace, Erdmann's. For gas. Consists of a clay chimney on iron tripod. Each $0.50 14534. Furnace, Erdmann's. With Bunsen burner. Each $1.00 14536. Furnace, Hempel's. JIade of clay. Size Small Large Each New York, Boslon, Chicago, U. S. .V., Frankfurt a/il., Germany. 223 14538 14550 14538. Furnace, Ladle. With Fletcher's solid flame heating burner for melting lead, tin, zinc, and their alloys. The burner is simple and safe, and works equally well with any gas supply available, giving speeds of working proportionate to quality of gas. The burner may be removed from the casing and used for other purposes. Capacity of burner, i cubic meter (30 cu. ft.) per hour. A lo-mm. gas supply pipe is required. Each $4.20 14540. Furnace, Ladle. gasoline gas. Same as No. 14538, but with cap-nut regulator for Each $4.55 14542. Furnace, Lecture and Experimental, Fletcher's. Specially designed for the lecture table. Works with the same burner as a draft or blast furnace at any temperature up to the fusion point of the casing. Adapted for crucibles, muffles, tubes, cupels, distillation by descension, treatment of refractory substances with gases of high temperature, small forgings, roasting ores, etc. When used as a blast furnace, as shown in left illustration, an empty crucible, 65x60 mm., can be raised to the fusing point of cast iron in two minutes from the time the flame is lighted. By turning the casing- on one side, as shown in right illustration, the contents may be seen by a class while the furnace is working, and it can, in this position, be used for crucibles, muffles, combustion tubes, cupels, 224 Bauscli & Loinb Optical Co., Rochester, N. Y., U. S. A., 14558 14562 or roasting, and with either draft or blast, according to the tem- perature required. Although not silent when in use at the highest power, a lecturer with a good voice can be heard while it is work- ing. Crucibles larger than 60 x 62 mm. must not be used. Fur- nace, with one muffle and one crucible 60x62 mm., without blower. (See illustration, page 223.) Each $30.00 14544. Burner, only, for No. 14542. 14546. Muffles, salamander, for No. 14542. 14548. Muffles, fire clay, for No. 14542. Each $g.oo Each $1.20 Each $0.60 14550. Furnaces, Muffle. For assaying, enameling, and all purposes where exact temperatures not exceeding the fusing point of copper are required. Burners are of same construction as No. 14488. Sup- plied with muffle, dome, crucible tongs, and 180 cm. of chimney pipe. MufHe space, mm. 75 x 100 x 65 95 x 125 x 75 Gas pipe bore, mm. 12 18 Each Muffle space, mm. Gas pipe bore, mm. 16.40 iiox 175x95 24.00 130 X 200 X no 25 Each 36.00 54.00 14552. Plumbago muffles, for No. 14550. 14554. Plumbago domes, for No. 14550. 14556. Chimney pipe, for No. 14550. Each $1.20 $1.50 $1.80 $3.00 Each $1.20 $1.50 $1.80 $3.00 Each $0.42 $0.48 $0.55 $0.72 14558. Furnaces, MufHe, Hoskins' Latest Design. For all kinds of muffle work. A length or two of stove pipe is required to create a draft through the muffle, or the furnace may be connected with a flue, in which case a damper must be put in the pipe. May be raised to a good heat for scorification in less than fifteen minute.^;. Number 2 3 Size of muffle, mm. 200x120x75 250x150x100 Each, Net iS^oo New ^'ork, Bu..tnii. Chicago, U. S. A., I-'rankfurt a/M., Germany. 14568 14568 14560. Muffles for furnaces No. 14558. Each, Net, No. 2, $0.75; No. 3, $1.00 14562. Furnace, MufBe and Crucible Combination. Hoskins' No. 1. Shown on the right as arranged for crucible furnace; on the left as arranged to take a muffle 150x90x65 mm. The change from crucible to muffle furnace is made by lifting off the cover and sub- stituting the part with the muffle opening. A scorification or two cupellations may be made in this furnace with perfect satisfaction. Weight complete, 11 kilos. (See page 225.) Each, Net $7.00 14564. Furnace No. 14562, with Blowpipe No. 14588, No. 2. Each, Net $30.00 14566. Furnace No. 14562, with Blowpipe No. 14588, No. 3. Each, Net $33.00 14568. Furnace, MuiHe cind Crucible Combination. Hoskins' No. 5. Takes one crucible 125x75 mm. and a muffle 150x90x65 mm. Length, 300 mm.; height, 400 mm.; width, 210 mm.; weight, complete, 15 kilos; packed, 20 kilos. Each, Net $10.00 14570. Furnace, Muffle and Crucible Combination. Hoskins' No. 6. Takes four crucibles 125 x 75 mm. and a muffle 250 x 150 x 100 mm. Length, 500 mm.; height, 475 mm.; width, 300 mm.; weight, com- plete, 45 kilos; packed, 60 kilos. Each, Net $20.00 Furnaces, Combustion. See Combustion Furnaces. 14572. Furnace, Perfected Injector, Fletcher's. Combined crucible and muffle furnace. The body of the furnace is large enough to receive a crucible 165x110 mm., holding 6 kilos of metal. The cover has a projection on one side which will reduce the height of the cavity of the furnace some 50 mm., or to the proper size to receive the muffle or a crucible 100 mm. high. By reversing the cover a crucible 165 x no mm. may be used. The gas supply must be from a 12-mm., or still better, an i8-mm. pipe. A No. 12588B or 125903 foot blower should be used. Furnace, for gas, with one crucible 100x95 mm. and one muffle 165x90x70 mm., without blower. Each $13.20 14574. Furnace, Perfected Injector, Fletcher's. Fire clay body, cover and two plugs, for No. 14572. Each $9.00 226 Bausch * Lomb Optical Co., Rochester, N. Y., U. S. A., 14572. I4S78 14580 I4S88 14576. Plumbago muffles 165x90x70 mm., for No. 14572. Each $1.80 14578. Furnace, Perfected Injector, Fletcher's. Same as No. 14572, but fitted for use with gasoline gas. Complete with gasoline gas generator No. i47goB, 360 mm. of tubing, one muffle, one crucible, and Foot Blower No. 12590B. Each $42.00 Furnace, Perfected Injector, Fletcher's. For refined petroleum or kerosene. The arrangement of this furnace is in every way as sim- ple and effective as when gas is used, requiring no more trouble or attention. It has been fully tested in the performance of metal- lurgic operations, and has been found equal to the gas furnace in efficiency. The number of burners used varies with the size of the furnace, and a foot blower of proportionate size will be required. (See list sizes, etc., on page 228.) New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 227 14590 14604 14592 I4S94 14580. Furnace, Perfected Injector, Fletcher's. With two burners and one crucible 75 x 65 mm. Each $12.00 14582. Body, cover, and dome for furnace No. T4580. Each $3.60 14584. Furnace, Perfected Injector, Fletcher's. With three burners and one crucible 100x95 mm. Each $15.00 14586. Body, cover, and dome for Furnace No. T4584. Each $6.00 Furnaces for Low Temperature. See Stoves. 228 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. .\., 14606 14602 14588. Furnace Blowpipes, Hoskins'. For gasoline. Made entirely of brass. Very strong. Wll not rust. (See Illustration, page 227.) Number 2 3 Capacity of reservoir, liters 2 4 Each, Net 23.00 26.00 14589. Extra burners for No. 14588. Each, Net $6.00 14590. Furnace Blowpipe, Hoskins' No. 4. For gasoline, ilade of heavy copper. This blowpipe is of the very best workmanship and will be found very convenient when large quantities or continuous work is required. Complete, with suitable pump, pressure gauge, 300 cm. of pipe, elbow, 20-liter tank, and two burners. Each, Net $50.00 14592. Fusel Oil Apparatus, Bromwell's. (See page 228.) Each $2.75 14594. Fusel Oil Apparatus, Herzfeld's. For the determination of fusel oils. With glass stopper. (See page 228.) Each $1.75 GAS APPARATUS Gas apparatus of any form not listed belovj will be made to order. 14596. Gas Apparatus. With Peligot's bulb tube; for the absorption of gases (Hempel, Fig. 40). Each $1.25 14600. Gas Apparatus. For the determination of oxygen by the exact method (Hempel, Fig. 51). Each $8.00 14602. Gas Apparatus, Bunsen's. For the determination of the specific gravity of gases by the rapidity of discharge. With mercury cistern (Hempel, Fig. 63). Each $36.50 14604. Gas Apparatus, Chancel's. For determining the specific gravity of gases. With extra flask of about same weight. Each $3.50 New York, Boston. Chicago, U. S. A., Frankfurt a/M., Germany. 229 14606. 14607. 14608. I46IO. I46I2. 14614- I46I6. Gas Apparatus, Drehschmidt's. For the determination of sulphur in illuminating gas (Hempel, Fig. 68). Each $30.00 Gas Apparatus, Johnson's. For purifying and drying gases with solid dryers, such as calcium chloride, phosphoric anhydride, etc. Avoids the use of rubber stoppers, the connecting tube being held in place by heavy pure gum tubing. Has heavy foot and needs no other support. Connecting tubes are of such form and interchange- ability as admit of any desired arrangement of a series in train or triangle. Well adapted for combustion trains. Designed by C. M. Johnson. (See illustration, pag;e 231.) Each $1.25 Gas Apparatus (Fluorometer), Oettel's. For the determination of fluorine (Hempel, Fig. 86). Complete, with support. Each $6.00 For the analysis of furnace gases. Complete in wooden case. Each $20.00 Glass parts only. Each $14.00 For the analysis of furnace gases. With modifications for estimating hydrogen separately. Consists of four pipettes and one measuring burette. Complete in wooden case. Each $33.25 Gas Apparatus, Orsat-Lunge's. Glass parts only. Each $22.50 Gas Apparatus, Orsat-Fisher's. Consisting of two pipettes. Gas Apparatus, Orsat-Fisher's. Gas Apparatus, Orsat-Lunge'c. 230 Bauscb Sr Lomb Optical Co., Rochester, N. Y., U. S. A., 14608 I46I4 14618. Gas Apparatus, Orsat-Muencke's. For the analysis of CO2, CO, and O. Consists of three pipettes and one measuring burette. Complete in wooden case. Each $25.00 14620. Gas Apparatus, Orsat-Muencke's. Glass parts only. Each $15.75 14622. Gas Apparatus, Petterson and Palmquist's. For the determination of carbon dioxid (Hempel, Fig. 81). Each $48.00 New York, Boston, Chicago, U. S. ,\., Frankfurt a/IM., Germany. 231 14634 14640 14636 14624. 14626. 14628. 14630- 14632- 14634- Gas Apparatus, Reich's. in kiln gases in the For the determination of sulphur dioxid manufacture of sulphuric acid (Hempel, Fig. 71). (See page 231.) Each $12.50 Gas Apparatus, Rudorfl's. For determining carbon dioxid in illu- minating gases or moisture (Hempel, Fig. 69). Each $10.00 Gas Apparatus, Rudorfl's. With compensating tube to render the apparatus independent of the temperature and pressure of the atmosphere. Each $12.00 Gas Apparatus, Schilling's. For determining the specific gravity of illuminating gas (Hempel, Fig. 64). Each $30.00 Gas Apparatus, Tieftrunk's. For the determination of tar in un- washed gases (Hempel, Fig. 66). Each $15.00 Gas Apparatus, Winkler's. For the estimation of methane; vyith platinum spiral (Hempel, Fig. 67). ' Each $|l.50 232 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14642 skiiS mil M a§» 14644 14638 14646 14636. Gas Apparatus, Winkler's. For the absorption of gases in large amounts (Hempel, Fig. 41). Each $3.00 Gas Apparatus for Nitrogen Determination. 14638. Condenser, Kjeldahl's. Of copper, with coils of blocic tin. Number of coils 6 10 Each 24.00 33.00 14640. Connecting Bulb Tubes, Kjeldahl's. (See illustration, page 232.) Size Small Large Each .25 .35 14642. Connecting Bulb Tubes, Hopkins'. New form for rapid work. De- signed by Prof. C. G. Hopkins. Each $0.50 14644. Digesting Shelf, Kjeldahl's. Oblong form. Number of burners 6 10 Each 16.00 20.00 New York, Boston, Chicago, U. S. \., Frankfurt a/'SL., Germany. 233 14672 14650 X4653 I46S4 14666 14658 14648 14656 14646. Digesting Shelf, Kjeldahl's. Round form, with six burners, each provided with stop cock. (See page 233.) Each $16.00 14648. Flasks, Kjeldahl's. Of copper; extra heavy. Capacity, cc. 250 500 1000 2000 Each .20 .25 .30 .35 14650. Flasks, Kjeldahl's. Of infusible Bohemian glass; pear shape; long neck. Capacity, cc. 100 250 500 1000 Each .15 .20 .30 .45 14652. Flasks, Kjeldahl's. Of infusible Bohemian glass; globe shape. Capacity, cc. 100 250 500 luoo Each .15. .20 .30 .45 14654. Flasks, Kjeldahl's. Jena Glass. Pear shape; long neck. Capacity, cc. 100 200 300 500 800 1000 1300 Each .18 .25 .32 .42 .50 .60 .70 234 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14562 14664 14660 14668 14674 14676 14678 14680 14684 14670 14682 14656. Nitrogen Bulb, Arendt's. 14658. Nitrogen Bulb, Clemens-Winkler's. With ground-in 14660. Nitrogen Bulb, French Fonn. 14662. Nitrogen Bulb, Fresenius'. 14664. Nitrogen Bulb, Shepard's. 14666. Nitrogen Bulb, Stein-Schwarz'. 14668. Nitrogen Bulb, VoUhard's. 14670. Nitrogen Bulb, VoUhard's. 14672. Nitrogen Bulb, VoUhard's, Latest Form. 14674. Nitrogen Bulb, Will-Varentrapp's. With three bulbs. Each $0.30 stopper. Each $1.05 Each $0.35 Each $0.45 Each $0.40 Each $0.70 Each $0.45 Each $0.45 Each $0.55 Each $0.30 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 235 14686 14688 14676. Nitrogen Bulb, Will-Varentrapp's. With three bulbs. Each $0.30 14678. Nitrogen Bulb, Will-Varentrapp's. With tour bulbs. Each $0.40 14680. Nitrometer, Franke's. For the determination of nitrogen. Each $8.00 14682. Nitrometer, Horn's. For the determination of nitrogen in gun pow- der. With leveling tube. Each $7.50 14684. Nitrometer, Kjeldahl's. A.s modified by Arnold; for nitrogen and ammonia determination. Each $5.50 14686. Nitrometer, Knop's. For the volumetric determination of nitrogen (Hempel, Fig. 57). Each $25.00 14688. Nitrometer, Knop-Wagner's. For the volumetric determination of nitrogen. Each $15.00 14690. Nitrometer, Lunge's. Capacity, 50 cc; graduated in i/io cc. With- out water-jacket. Each $4.00 14692. Nitrometer, Lunge's. With water-jacket. Each $5.00 14694. Nitrometer, Lunge's. For the determination of nitrogen in salt- peter gun powder, nitroglycerine and other combinations. Gradu- ated from 100 to 140 cc. in i/io cc. Complete with support. Each $8.00 236 Bauscli &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 14698 14708 14696. Nitrometer, Lunge's. Without support. Each $5.00 14698. Nitrometer, Schiff's. For the determination of nitrogen. Capacity, 100 cc; graduated in 1/5 cc. With reservoir. Each $5.00 Nitrometer Supports. See Supports. 14700. Gas Bags. Pure gum; without stop cock; oblong. Capacity, liters 60 100 140 220 Size, cm. 45x60 50x75 60.K7S 75x100 Each, Net 14702. Gas Bags. Oval. Capacity, liters 6.55 8.30 10.10 12.60 Each, Net Capacity, liters •95 20 1. 10 -'4 1.30 28 Each, Net 2.25 2.70 3.00 3.40 3.90 14704. Brass stop cock for connecting gas bags with tubing. Size Small Medium Large 465 Each .80 1. 00 16 1.45 1.60 1.80 2.10 32 36 40 New York, Eoston, Chicago, U. S. A., Frankfurt a/il., Germa I47I2 I47I4 I47I6 I47I8 14720 14706. 14708. I47IO. I47I2. I47I4- I47I6. I47I8. 14720. 14722. 14724- Rubber stop cocks for connecting gas bags with tubing. Size Small Medium Large Each 1. 00 1.20 1.50 Gas Balances. Any kind imported to order. Gas Balloons. Of blown glass; for weighing gases. (See page 237.) Style A B C D Each .75 1.50 1.50 2.50 Gas Balloons for Collecting Gases. See BALLOo>rs. Gas Bottles. For generating gases. Capacity, cc. 125 175 250 375 SOO 750 1000 Each .10 .15 .18 .20 .24 .30 .35 Gas Bottles. With rubber stopper, funnel and delivery tubes. Capacity, cc. 125 175 250 375 500 750 1000 70 Each .45 .48 .50 .55 .60 Gas Bottles. With rubber stopper, safety and delivery tubes. Capacity, cc. 125 175 250 375 500 750 ■75 Each .18 20 .25 .30 .35 .40 Gas Bottles. With ground glass stopper, funnel and delivery tubes. Capacity, cc. 250 500 lOOO Each .80 Gas Bottles. With ground glass stopper, safety tube with glass stop cock and delivery tube. Capacity, cc. 250 500 1000 Each 1.50 2.25 Gas Bottles, Vogel's. With rubber stopper. Capacity, cc. 125 175 250 375 SOO 7S0 1000 Each .50 .60 .70 .75 .80 .go 1. 00 Gas Burette, Bunte's. Without water-jacket; 50 cc. in i/io. Each $5.00 Gas Burette, Bunte's. With water-jacket; 50 cc. in i/io. Each $5.75 238 Bausch 6- Lomb Optical Co., Rochester, N. Y., U. S. A., 14728 14732 14730 14726. Gas Burette, Elliott's. For explosions. Each $5.75 14728. Gas Burettes, Hempel's. For gas analysis. Set of two on heavy wooden bases (Hempel Fig. 17). Per set $5.00 14730. Gas Burettes, Hempel-Winkler's. With glass stop cocks. Set of two on heavy wooden bases (Hempel Fig. 18). Per set $7.50 14732. Gas Burettes, Hempel's. With correction for temperature and pres- sure (Hempel Fig. 19). Complete as per illustration. Each $15.00 14734. Gas Burettes, Hempel's. Connecting Tubes for connecting gas bur- ettes, gas pipettes, etc. Each $0.15 Gas Burners. See Burners, L.\mps, Furnaces, Stoves. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 239 14736 14736. 14738. 14740. 14742. 14744. 14746. 14748. 14750. 14752. 14754. 240 14742-14746 14748 14740 Gas Collecting Tube. With glass stop cocks (Hempel Fig. 14). Gas Collecting Tubes, Cooper's. Style A Each $2.50 B Gas Distributors. Gas Distributors, Gas Distributors. Gas Distributors. $1.00 $2.00 $3.00 $4.00 Each .25 .25 .50 Gas Cylinders. See Gas Holders. Gas Distributors. Of brass. Three-way; without stop cocks. Each Three-way; with two stop cocks. Each Four-way; with three stop cocks. Each Five-way; with four stop cocks. Each Four-way; with four stop cocks, and small burner in center with stop cock. Each $4.50 Gas Generators. For generating chlorine gas. Consists of a ring- neck flask and a washing bottle with rubber stoppers, funnel and delivery tubes, etc. (See illustration, page 241.) Capacity, cc. 100 250 500 1000 2000 Each .70 .80 .90 1.25 1.50 Gas Generators. For generating oxygen. Of heavy polished copper, v/ith iron clamp and brass delivery tube fitting by ground joint. Diameter of tube, 12 mm. (See illustration, page 241.) Capacity, cc. 250 500 1000 2000 Each Gas Generator. 1.80 2.00 2.50 3.00 For generating hydrogen by electrolysis. Each $4.00 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14750 H754 14756 14764 14752 14756. 14758. 14760. 14762. 14764. 14766. Gas Generator. ulphureted hy- Each $5.00 Each $1.20 For generating oxy-hydrogen by electrolysis. Each $4.00 Gas Generator, Babo's. For the rapid production of drogen in small quantities. Mounted on stand. Gas Generator, Babo's. Glass parts only. Gas Generator, Dudley's. For generating sulphureted hydrogen rap idly in large quantities. Used in the laboratory of the Pennsyl vania Railroad Co. Consists of a jar, 450 x 100 mm., for the iron sulphide and a bottle of 2 liters capacity and with stop cock for the acid. (See illustration, page 242.) Each $5.00 Gas Generator, Duflos'. With copper basket and funnel tube. Capa- city, I liter. Each $3.00 Gas Generator, Kekule's. (See illustration, page 242.) Capacity, liters 4 12 Each 4.50 8.00 New York, Pioslon, Cliicago, U. S. .\., Frankfurt a/M., Germany. 241 I47C3 1477° 14774 14768. Gas Generators, Kipp's. Improved form, for the continuous produc- tion of hydrogen sulphide. With large side opening for filling. Complete with Geissler's stop cock, funnel tube, etc. Capacity, cc, 250 500 1000 1500 2000 Each 3I00 3^75 4^0 5^50 &!2S 14770. Gas Generators, Kipp's. For generating hydrogen sulphide. Capacity, cc. 250 500 1000 2000 Each 3.00 3.7s 4.50 6.25 14772. Gas Generators, Kipp's. Perforated Rubber Plates for holding the iron sulphide in the above generations (Nos. 14768 and 14770) from falling into the lower chamber. Size; capacity of generator, cc. 250 500 1000 2000 Each .30 •35 •45 .60 242 Bauscli &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 14780 14774- Gas Generator, Muencke's. For the production of pure carbon di- oxid without air. Each $11.00 14776. Gas Generators, Norblad's. For the production of hydrogen sulphide and carbon dioxid. Without support. Capacity, cc. 1000 2000 Each 5.75 9.00 14778. Gas Generators, Norblad's. Support for Norblad's generators. Either size. Each $2.75 14780. Gas Generator, Skidmore's Normal School. Designed by Prof. S. T. Skidmore for individual student use. Will supply HCO2, NO, HzS or any gas generated by the action of a liquid on a solid without heat. The action is under perfect control by adjusting the relative New York, Boston, Chicago, U. S. A.. Frankfurt a/M., Germany. 243 14784. 14788. 244 14790 14794. 14796 height of the bottles. Wide mouth bottles are used so as to admit large lumps. Capacity of bottles, 125 cc; any size may be supplied to order. Each $2.00 Gas Generator, Steenbuch's. For the continuous production of hy- drogen, hydrogen sulphide and carbon dioxld. Each $4.80 Gas Generator, Wait's New. Designed by Dr. Charles E. Walt. For generating carbonic anhydrid, hydrogen sulphide, or hydrogen. The generator consists of an outer jar for the acid liquid and an Inner gas generating tube to hold the solid. The latter is very much en- larged near the bottom for holding large amounts of the solid and at its top terminates in a glass stop cock; it is securely fastened to the movable cover, forming one piece with it,' thus avoiding the use of cork or stopper of any kind fitted to the generating vessel the loosening of which by repeated use allows the escape of gas which in time exhausts the generator, one of the most objectionable fea- tures of many of the generators on the market. The advantages of this generator are: its gas tight reservoir, its unusually large gen- erating tube, and the simplicity of its parts which enables the gen- erator to be taken apart, deaned and recharged with considerable ease. (See illustration, page 243.) Capacity, liters 4 ' 12 Each 12.00 22.00 Gas Generator, Gasoline. Made entirely of brass, polished and nickel plated. Provided with valve of special construction which controls both gas and air outlets by partially revolving the hand wheel to the left, and completely shuts off all connections from the gener- Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., h c- H ■ _ I cylin isS 14798 14800 14790. 14792. 14794. ator by turning to the right. By means of this valve the size of flame can be regulated from a large brush flame to a fine needle point. The interior of the generator contains nearly 4200 centi- meters of evaporating surface and when the gasoline has been re- moved there still remains gas enough to operate the blowpipe for nearly twenty minutes. Capacity, I liter. The hand wheel must be turned to the right before attempting to fill the generator or the generator will be filled too full of gasoline. Each $9.00 Gas Generator, Gasoline. For use in furnace and blowpipe work where coal gas is not available. The vapor produced gives a flame and heat of absolute purity for the most delicate chemical opera- tions where coal gas cannot be used owing to the presence of sul- phur and other impurities. Must be used with air pressure. Com- plete with directions for use, (See illustration, page 244.) A B Size, mm. 100x100x250 250x250x450 Capacity, liters i 6 Each 7.20 18.00 Gas Holders, Berzelius'. All glass. (See illustration, page 244.) Capacity, liters 248 Each 7.50 9.00 ■ 15.00 Gas Holders, Berzelius-Pepy's. Improved form, copper, with glass gauge. Capacity, liters 20 40 Made of heavy Each 26.00 New York, Boston. Chicago, U. S. .V., Frankftirt a/M., Germany. 245 a 14808 14796. 14798. 14800. 14812 14814 14802. 14804. 14806. 14808. 1 4810. Gas Holders, Berzelius-Pepy's. Made of heavy zinc. (See page, 244.) Capacity, liters 20 40 £ach 17.00 20.00 The above gas holders, Nos. 14794 and 14796, will be made ii) larger sizes to order. Gas Holders, Mitscherlich's. Made of glass, with brass fittings. Capacity, liters 15 25 Each 20.00 28.75 Gas Holders. Steel cylinders for holding gases. (See illustration, page 245.) Capacity, at 225 lbs. pressure to sq. in., cu. ft. 15 25 Each, Net 14.00 15.00 Valves for controlling outlet of gas for No. 14800. Each, Net $3.00 Pressure gauge for No. 14800. Each, Net $4.50 Wrench for opening and closing valve for No. 14800. Each, Net $0.80 Gas Measuring Tubes. Of glass; accurately graduated; sealed at one end. Capacity, cc. 25 25 50 50 100 100 200 Graduated, cc. i/io i/s i/io 1/5 i,/5 i i Each .65 .55 .90 1. 00 1.50 1.20 1.50 Gas Measuring Tubes. Of glass; accurately graduated; with stop cock Capacity, cc. Graduated, cc. SO i/io 100 i/S Each 1.7s 2.25 Gas Measuring Tubes, Other Styles. See Eudiometers and Gas Col- lecting Tubes. 246 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14820 14822 14812. Gas Palladium Tube, Hempel's. For the absorption of hydrogen. Holds about 2 grams of palladium sponge (Hempel Fig. 56). Filled. Each $1.50 14814. Gas Pipette, Etling's. For exact analysis over mercury (Hempel Fig. 28). Each $2.50 Gas Pipettes, Hempel's. Mounted on latest improved iron supports, the glass parts being fastened to the stands by means of adjustable clamps instead of being cemented to wooden or metal frames with plaster of Paris as in older forms. In this form of stand it is pos- sible to attach new glass parts in a few moments, the adjustable clamps compensating for any variation in the shape of the pipette. 14816. Gas Pipette, Hempel's. Simple absorption; for liquid reagents. (Hempel Fig. 20.) Each $3.25 14818. Gas Pipette, Hempel's. Simple absorption; for liquid and solid re- agents. (Hempel Fig. 21.) Each $3.25 New York, Boston, Chicago, U. S. A., Frankfuft a/M., Germany. 247 14828 14830 14820. Gas Pipette, Hempel's. Compound absorption; tor liquid reagents. (Hempel Fig. 22.) (See page 247.) Each $4.00 14822. Gas Pipette, Hempel's. Compound absorption; for liquid and solid reagents. (Hempel Fig. 23.) See page 247.) Each $4.00 14824. Gas Pipette, Hempel's. Compound absorption; for preparing pure hydrogen. (Hempel Fig. 45.) Each $4.50 14826. Gas Pipette, Hempel's. Ethylene absorption; with glass beads. (Hempel Fig. 60.) Each $4.00 14828. Gas Pipette, Hempel's. Explosion; with platinum electrodes, stop cock, and leveling bulb. (Hempel Fig. 44.) Each $7.00 14830. Gas Pipettes, Hempel's. Simple explosion; with stop cock and plat- inum electrodes. (Hempel Fig. 46.) Each $5.00 14832. Gas Pipettes, Hempel's. Compound explosion; new form with elec- trodes for generating hydrogen and oxygen. Each $5.00 Connecting Tubes for connecting gas pipettes, gas burettes, etc. See No. 14734. 248 Baiisch (J l.omb 0|itic;il Co., Koclicater, N. Y., U. S. .\.. 14836 *• I _n lamni ggj^^^^E"5 I 14843, 14844, 1484s 14836. Gas Regulator. For shutting off the supply of gas at any desired time. Consists of a specially constructed clock with timing device and gas valve. The gas valve is connected by rubber tubing be- tween the gas supply and the apparatus which it is to regulate. Each $4.80 14838. Gas Regulator, Dunham's. For incubators and other purposes where exact temperatures are required. This is an extremely sensitive and simple regulator. Its sensitiveness is derived from the use of alcohol in the large bulb. The minute changes in the volume of alcohol caused by temperature variations act on a column of mer- cury in the U-shaped arm and regulate the passage of gas through the tubes. Adjustments for different temperatures are made by sliding the gas inlet tube up or down as required. Directions for New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 249 14846 14848 14850 14855 filling and using accompany each. Complete with liquid and mer- cury for filling. Each $3.50 14840. Gas Regulator, Dunham's. Glass parts only. Each $2.00 14842. Gas Regulator, Muencke's Improved. For low pressure only. When the temperature rises the gas supply is reduced by mercury clos- ing the passage at the fork. A stop cock controls the passage of gas through the horizontal tube to the reserve flame. Each $4.50 Gas Regulator, Reichert's. This regulator is carefully made and tested. (See illustration, page 249.) 14843. Gas Regulator, Reichert's. For high temperatures. Each $2.00 14844. Gas Regulator, Reichert's. For low temperatures. Each $2.00 14845. Gas Regulator, Reichert's. Short form for water-baths. Each $2.00 14846. Gas Regulator, Reichert's Improved Form. With stop cock to pre- vent extinguishing of the flame. Each $3.75 14848. Gas Regulator, Reichert-Novy's. An improved form for high or low temperatures. The maximum flow of gas is ample for high tem- peratures while the construction of the regulator is such that the 250 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14858 14860 14862 14864 14850. flow may be reduced to an amount just sufficient to keep the flame from going out. This regulator works exceedingly well especially when connected with the gas pressure regulator No. 14854. Each $5.00 Gas Regulator, Roux' Bimetallic. An accurate regulator made with- out the use of mercury or glass. It is exceedingly simple in ope- ration and regulates more constantly than any other form of regu- lator now on the market. Size Small Large 14852- 14854. 14856. 14858. Each 14.00 Gas Regulator, Soxhlet's. A simple regulator consisting of a glass tube of special form with inner tubes for controlling the passage of gas. Alcohol may be used as the sensitive fluid. Each $1.00 Gas Pressure Regulator. For delivering gas to apparatus at a con- stant pressure regardless of the pressure variations in the supply. Designed to be used in connection with a gas regulator and with it the temperature may be held constant within o.i°C. With this ap- paratus and Novy's gas regulator it is possible to maintain constant temperatures in an air bath at 50°C and an oven at i5o°C at the same time. JIade of copper. Each $5.00 Gas Washing Bottles, Allihn's. Double acting. Capacity, cc. 250 500 • 1000 Each 1.25 1.50 1.75 Gas Washing Bottles, Bunsen's. With tube and rubber stopper. Height, mm. 160 180 230 Diameter, mm. 37 40 60 Each .50 .65 .90 14860. Gas Washing Bottles, Drechsel's. High form. Capacity, cc. 100 150 200 250 500 Each .60 14862. .75 .85 I -00 1.25 Gas Washing Bottles, Drechsel's. Low form. Capacity, cc. 100 150 200 250 500 Each .60 ■75 .85 1.25 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 251 14876 14874 14878 14880, 14882 14866 14872 14864. 14866. 14868. 14870. 14872. 14874. 14876. 14878. 14880. Gas Washing Bottles, Muencke's. Capacity, cc. 100 (See illustration, page 251.) 250 SCO 1.25 1.50 Each 1. 00 Gas Washing Tube, Muencke's. Gas Washing Tube, Muencke's. With stop cock. Gas Washing Tube, Scheibler's. Gas Washing Tube, Scheibler's. With stop cock. Gasometers. See Gas Measuring Tuees, Eudipmeters. Gauges, Spring. For pressure. Diameter, mm. 7S 90 12S 150 Each Each Each Each Each 4.00 Gauges, Spring. For vacuum. Diameter, mm. 75 5-00 90 5-50 125 10.00 150 $1.10 $2.00 $1.00 $2.00 Each 4.00 5.00 5.50 10.00 Gauge, Vacuum (Manometer). Of glass, on wooden base; with scale. Each $2.25 Gauge, Vacuum (Manometer), Bennert's. With stop cock and mov- able scale. Each $6.25 252 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14890 14886 1 4882. 14884. 14886. T4888. 14902 Gauge, Vacuum (Manometer), Bennett's. With movable scale en- graved on mirror glass. Each $7.25 Gauge, Vacuum (Manometer), Claisen's. Each $9.00 Gauges, Wire. American Standard; B. & S. Of best tempered steel. Size to 36 S to 36 Each, Net 3.50 2.50 Gauge Tubes. For manometers; plain. Length, mm. 100 200 400 Each .12 .20 .25 Gauze, Wire. See Wire Gauze. 14890. Germinating Apparatus, Schonjahn's. Consists of a glass vessel with germinating sieve of porcelain, cover, and thermometer. Each $10.00 14892. Glass Beads. For increasing surface in absorbing and drying gases. Solid: 3 to 4 mm. diameter. Per five hundred grams $1.00 14894. Glass Beads. Hollow; 5 to 6 mm. long; 4 to 5 mm. diameter. Per five hundred grams Glass Blowers Lamps. See Blast Lamps. 14896. Glass Boxes. With ground-on cover; 100x40x40 mm. Each 14898. Glass Cutter. Diamond; for glass plates. Each 14900. Glass Cutter. Steel wheel; for glass plates. Each $1.00 $0.75 $5-00 $0.15 New York, Boston, Chicago, U. S. A., Frankfurt a/JNI., Germany. 253 14908 I49IO 14902. Glass Cutter. For tubing; cuts glass tubing of 10 mm. diameter or over. (See illustration, page 253.) Glass Ink (Diamond Ink). See Ink. Glass Plates. Se^ Plates. Glass Powder. See Chemical Catalogue. 14904. Glass Rod. Of German glass, easily melted. Diameters from 2 to 25 mm. InV/i meter lengths. Per five hundred grams $0.40 14906. Glass Stirrers. Of best German glass; with rounded ends. All sizes; price according to size; 150 mm. length sent unless otherwise or- dered. Price for 150 mm. length. Per five hundred grams $0.60 14908. Glass Tubing. Of best German, soft glass. The only suitable tubing for bending and blowing. In lengths of about i>^ meter. Diameter (outside), mm. 2 to 25 23 to 50 Per five hundred grams .40 .45 14910. Glass Tubing, Barometer. Per five hundred grams $0.55 14912. Glass Tubing, Capillary. From i to 5 mm. outside diameter. Per five hundred grams $0.90 14914. Glass Tubing, Combustion. This, is genuine Bohemian tubing, made by Kavalier. In lengths ot ij4 meter. Diameter (outside), mm. 3 to 8 9 to 20 Per five hundred grams .90 .75 14916. Glass Tubing, Combustion. Hard Jena Glass. In lengths of i or 2 meters; 2 meter length sent unless otherwise ordered. Diameter (outside) 12 to 25 mm. Per five hundred grams $0.90 14918. Glass Tubing. For explosion furnaces; of hard Jena glass. Highly resistant to temperature changes and the corrosive action of fluids. This tubing can be brought into the blast furnace without previous warming. In lengths of i or 2 meters; 2 meter lengths sent unless otherwise ordered. Per five hundred grams $0.90 14920. Glass Wool. Of spun glass; for filtering acids, etc. Grade Coarse Fine Free from lead Per five hundred grams 4.50 5.40 6.30 Gloves. See Rubber Gloves and Asbestos Mittens. 254 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 14946 14932 14922. 14924. 14926. 14928- 14930. I493I. 14932. 14934. 14938. Goggles. Colored glass; for protecting the eyes. Per pair Gold Washing Horn. Made of polished steel; 230 mm. long. Each Gold Washing Horn. Made of heavy copper; 230 mm. long. Each $0.30 $0.40 $0.60 $1.20 Gold Washing Pan. Agateware; 400 mm. diameter. Each Gold Washing Pan. Made of steel, with copper bottom; diameter, 400 mm.; depth, 50 mm. Each $2.50 Gold Washing Pan. (Miner's Washing Pan). Plain iron; diameter, 400 mm. Each $1.00 Gold Washing Pan. Made of heavy copper- diameter, 400 mm., depth, 50 mm. Each $2.75 Goldbeaters Skins. Per ten $0.75 Graduates. Conical; with pressed lines and figures. Capacity, oz. i 2 4 8 16 Each •15 ■25 GRADUATES Guaranteed by us to be of finest quality and accurately graduated. 14940. Graduates. Conical; graduated in ounces. (See page 256.) Capacity, drams i 2 oz. 54 I 2 3 Each Capacity, oz. .28 4 .30 6 .18 12 .22 16 .25 3^ Each .28 •35 .40 •55 .70 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 255 14940 14942 14948 14942. 14944- Graduates. Conical; graduated in cubic centimeters. Capacity, cc. 5 10 15 30 60 Each Capacity, cc. .28 120 •30 ISO .22 250 ■25 350 .28 500 90 •30 1000 Each .35 .40 .50 .70 .80 1.40 Graduates. Conical; graduated in ounces and cubic centimeters. Capacity, drams i 2 oz. Yz i 2 3 Capacity, cc. s 10 IS 30 60 90 Each •30 •35 •30 •32 •35 •45 Capacity, oz. 4 6 8 12 16 32 Capacity, cc. 120 ISO 250 350 SCO 1000 Each .50 .55 .70 1.00 1.10 1.80 14946. Graduate. Large size; with handle. Graduated with greatest accu- racy. Capacity, 1500 cc. (See page 255.) Each $1.00 Graduates, Other Kinds. See Cylinuer. Grinders. See Crushers. 14948. Haemacytometer, Gower's. For counting red and white blood cor- puscles. This apparatus consists of (i) a small pipette which when filled to the mark on the stem holds exactly 995 cubic milli- meters, (2) a capillary pipette marked to contain exactly 5 cubic millimeters, and having rubber tube and mouth-piece, (3) a small glass jar in which the dilution is made, (4) a glass stirrer for mix- 256 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 14970 14950, 14966 ing the blood and solution in tlie glass jar, (5) a brass stage plate carrying a glass slip on which is a cell i/s mm. deep. The bottom of this cell is ruled into i/io mm. squares. Upon the top of the cell rests the cover glass which is kept in place by spring clips. Complete in case with minor accessories including a spear-pointed lancet and full directions for using. Each, Net $23.00 Haemacytometer, Thoma-Zeiss'. This apparatus consists of a gradu- ated mixing pipette and a counting chamber. The pipette is a thick walled capillary tube, very accurately calibrated and gradu- ated, with one end ground to a point and a bulb near the other end in which the blood is properly mixed with the diluting liquid, by means of a small. glass bead. The proper amounts of blood and dilutent are drawn into the pipette by suction through the mouth- piece and rubber tube. The counting chamber consists of a pol- ished plate glass slide, a finely polished glass slip having a circular opening, and a ruled circular disc inside this opening, both being cemented to the slide. The surface of the disc is exactly l/io mm. below the level of the slip and is ruled into squares, each square having sides of 1/20 mm. thus covering an area of 1/400 square mil- limeter. Two accurately plane and carefully polished cover glasses are provided. The cover glass resting on the surface of the slip forms a chamber over the ruled area having an exact depth of l/io mm. Each set is supplied in velvet lined morocco covered case, with full directions for using. The haemacytometers listed below will be furnished with Zap- pert's rulings at same price. New York, Boston, Chicago. U. S- A., Frankfurt a/M., Germany. 257 14950. 14952- 14954- 14956- 14958. 14959- 14960. T4961. 14962. 14963. 14964. 14966. 14968. Haemacytometer. Haemacytometer. Haemacytometer. Haemacytometer. corpuscles. Haemacytometer. corpuscles. Haemacytometer. 14970. 14976 For counting red corpuscles. Each, Net $10.95 For counting white corpuscles. Each, Net $10.95 For counting both red and white corpuscles. Each, Net $15.15 Extra mixing pipette graduated for counting red Each, Net $3.80 Extra mixing pipette graduated for counting white Each, Net $3.80 Extra counting chamber for leucocytes, after Friedlander. Depth of chamber, 0.222 mm. Each, Net $8.40 Haemacytometer. Extra counting chamber with Thoma-Zeiss rul- ings. Each, Net $6.30 Haemacytometer. Extra counting chamber with Turk's rulings. Each, Net $8.40 Haemacytometer. Extra counting chamber with Zappert's rulings in which the central square millimeter is surrounded by 8 other un- divided squares of the same size. Each, Net $6.30 Haemacytometer. Extra counting chamber with Zappert's rulings as described in DaCosta's "Clinical Haematology," page 44. Each, Net $6.30 Haemacytometer. Extra cover glasses, plane, polished, 0.4 or 0.6 mm. thick. Each, Net $0.32 Haemacytometer. Extra cover glasses, plane, polished, 0.18 mm. thick, cemented to heavy conical glass cells. Each, Net $0.85 Haemacytometer, Miescher's. The pipette of this counting apparatus is similar to the mixing pipette of the Thoma-Zeiss haemacytom- eter, but has polished point and is graduated for three different dilutions, viz., one in one hundred, one in one hundred fifty, and one in two hundred. The counting chamber is the same as that of the Thoma-Zeiss haemacytometer. Complete in case. Each, Net $13.45 Haemaglobinometer, Gower's. For estimating the amount of haem- aglobin in blood. Consists of two glass tubes of exactly the same size, one containing a standard tint of normal blood, the other grad- uated for measuring the amount of haemaglobin; a capillary pi- pette for measuring the correct amount of blood for the test; a. 258 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. K, 14978 149^0 bottle with pipette stopper for the diluting solution, and a spear- pointed blood lancet. Complete in case, with full instructions for using. Each, Net $7.60 14972. Haemacytometer and Haemaglobinometer, Gower's. Sets Nos. 14948 and 14970 complete in one case. Each, Net $30.00 14974. Haemaglobinometer, Gower's, Simplified Form. Consists of a sealed tube containing a standardized solution, a graduated comparison tube, a capillary pipette, and cork wood base. Full directions for use accompany each set. Each, Net $2.25 14975. Haemaglobinometer, Gower's, as Modified by Haldane. Consists of a sealed tube containing a standard blood solution, a graduated tube for measuring the haemaglobin in the sample tested, a rubber stand for the two tubes, a capillary pipette and suction tube for deliver- ing the proper amount of blood, a bottle with pipette stopper for holding the water required for diluting the blood, a glass vial hold- ing six blood lancets, and a tube and cap for attachment to gas burner to deliver gas for saturating the diluted blood with CO. Full directions for use accompany each set. Each, Net $12.50 14976. Haemaglobin Scale, Tallquist's. This haemaglobin test can be used by any one with sufficient accuracy for practical purposes and with a celerity that makes haemaglobin estimation no more of an under- taking than feeling the pulse. It consists of a color scale of ten tints, ranging from ten per cent, to one hundred per cent., bound in book form, pocket size, with fifty sheets of standard filter paper, sufficient for 150 tests. Directions for use accompany each. Each, Net $1.50 14978. Haemaglobin Outfit, Physician's. For approximate estimation of haemaglobin according to Hammerschlag's specific gravity method. This simple outfit can be carried to the bedside, if desired, and will give sufficiently accurate results for diagnostic purposes. The hydrometer is specially graduated with large graduations between the limits given by Hammerschlag's table. The outfit consists of a special hydrometer, a hydrometer jar, a mixing jar, a glass stop- pered bottle, a stirring rod, two dropping bottles, and is furnished complete with directions and table in a carrying case. Each $5.00 14980. Haemometer, Fleischl's. For measuring the percentage of haema- globin in blood. The standard of comparison in this instrument is a tinted wedge of glass mounted movably beneath the stage. In New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 259 i4g8i. 14982. 14984 the center of the stage is a circular opening in which rests a metal tube having a vertical partition and glass bottom. One-half of this tube is directly over the tinted -wedge, and v^rhen the instru- ment is in use is filled with distilled water; the other half of the tube is for the mixture of blood and water. The frame bearing the tinted wedge has a scale from which percentages of haemaglobiu are read directly and is moved back and forth underneath the tube by rack and pinion so that comparisons are readily and accurately made. Only a small quantity of blood is required and results are obtained easily and quickly. Complete in case with handle and lock. Each, Net $24.00 Capillary Tubes for above Haemometer. When ordering state ca- pacity. Each, Net $0.30 Haemometer, Fleischl's. As modified by Miescher. The utility and accurary of this instrument have been increased by the modifica- tions which consist in using a dilute solution of a known degree of concentration and a definite depth of fluid in the cell. A mixing pipette is employed which gives better results than the aspiratin'^ capillary pipettes. The most advantageous sections of the wedge may be used, which contributes to the accurary of the method and furnishes additional means of verification. The test solutions are made independently of the instrument, hence the latter may be standardized to read absolute percentage of haemaglobin and is de- void of all dependence on the so-called normal blood standard. The cell is of improved tj'pe and provided with diaphragms and covers. Detailed directions for setting up and adjusting the instrument, and for its calibration (including table), are furnished. Complete outfit, including two cells and a mixing pipette, in case. Each, Net $50.00 Haematokrit. See Centrifuges. Hammers. Of solid cast steel; wedge-shape; for breaking ores. Weight, grams 60 120 210 300 450 540 780 Each .40 .45 .50 .60 .70 .80 .90 14986. Hammers, Mineralogical, Dana's. Of solid cast steel; edge parallel to handle. Weight, grams 400 600 800 Each .75 1. 00 1.25 14988. Hammers, Mineralogical, Dana's. Of solid cast steel; edge at right angle to handle. Weight, grams 400 600 800 Each .60 .75 .90 260 Bausch S- Lomb Optical Co.. Rochester, N. Y., U. S. A.. 14984. 'fi3f-jr.-!trtr-^ 15108 15080 15082 jiJliiiBitJiii i ifelSa^^ 1 1 I I n-r-i-'i-'T'W^-s 15008 14990. Hammer, Blowpipe, Colton's. With wire handle. Each $0.75 14992. Hammer, Blowpipe, Plattner's. With wooden handle. Each $0.60 Handles for Files. See File Handles. Holder for Triangle. See Platinum Triangles. Homeopathic Vials. See Vials. Hones. See Dissecting Instruments. Hour Glasses. See Sand Glasses. HYDROMETERS We offer below a line of hydrometers which are especially suited for scientific work. They are made under our own super- vision and therefore we can guarantee them to be accurate and at least equal to other hydrometers on the market. Our aim is to offer hydrometers of the very best grade and of a range wide enough to accommodate all kinds of work. 14994. Hydrometers, Baume's Scale. For liquids lighter than water. Scale, 30° to 10° so" to 10° 70° to 10° 90° to 10° Divisions 1/10° i/lo°- 54° 1° Each 1. 00 1. 00 1. 00 1. 00 14996. Hydrometers, Baume's Scale. With thermometer. Scale, 30° to 10° 50° to 10° 70° to 10° 90° to 10° Divisions l/io" 1/10° 1^2° 1° Each 1.75 1.75 1.75 1.7s 14998. Hydrometers, Baume's Scale. For liquids heavier than water. Scale o to 10° otois° otoi5° 01070° o to 100° Divisions l/io' 1/10° 1° 1° t° Each i.oo i.oo .75 i.oo i.io Scale 5° to 15° 15° to 30° 30° to 50° 50° to 70° Divisions 1/10° 1/10° 1/10° 1/10° Each I.oo I.oo i.oo i.oo 15000. Hydrometer, Acid, Baume's Scale; American Standard. Scale o to 70° in divisions of 1° Length, 300 mm. Each $0.40 15002. Hydrometer, Alcohol, Gay-Lussac's. Best quality: graduated o to 100° in degrees. Each $0.40 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. o6t IS004. Hydrometer, Alcohol, Gay-Lussac's. With thermometer. Each $1.00 15006. Hydrometers, Alcohol, Richters and Tralle's Scales. With percentage thermometer. Scale o to 100° 30° to 100° 70° to 100° Divisions 1° i/^° ^° Each .80 1. 00 1. 00 15008. Hydrometer, Alcohol, U. S. Customs House Standard. With Tralle's and Proof Mark scales; graduated o to 100°. With thermometer. Each $2.00 15010. Hydrometer, Alcohol, U. S. Internal Revenue Standard. Set of five. Per set $27.00 15012. Hydrometer, Alcohol, U. S. Internal Revenue Standard. With cop- per can and thermometer; in wooden case. Per set $45.00 15014. Hydrometer, Alkali. Baume's scale; graduated o to 50° in degrees. Each $0.40 15016. Hydrometer, Ammonia. Baume's scale. Each $0.40 15018. Hydrometer, Bark (Tannometer). Specific gravity scale i.ooo to 1.060. Each $0.40 15020. Hydrometer, Bark (Tannometer). With thermometer. Each $1.75 15022. Hydrometer, Battery. Baume's scale; 100 mm. long. Each $0.60 15024. Hydrometer, Beer, Balling's. Showing per cent, to i/io. Each $0.80 15026. Hydrometer, Beer, Balling's. With thermometer. Each $1.75 15028. Hydrometer, Beer and Wort, Kaiser's. Graduated o to 25" in }^°. Each $0.40 15030. Hydrometer, Beer and Wort, Kaiser's. W^h thermometer. Each $1.00 15032. Hydrometer, Benzine. Baume's scale. Each $0.60 15034. Hydrometer, Chlorine. Baume's scale. Each $0.40 15036. Hydrometer, Cider. Baume's scale. Each $0.40 15038. Hydrometer, Coal Oil. Graduated 30° to 50° in degrees. Each $0.40 15040. Hydrometer, Coal Oil. With thermometer. Each $1.00 15042. Hydrometer, Ether. Baume's scale; graduated 35' to 70° in degrees. Each $0.40 15044. Hydrometer, Ether. With thermometer. Each $1.00 15046. Hydrometer, Gasoline. Baume's scale; graduated 10° to 90°. Each $0.60 15048. Hydrometer, Glycerine. Baume's scale; graduated 25° to 30°. Each $o.So Hydrometer, Milk. See Milk Testing Apparatus : Lactometer. 15050. Hydrometer, Naphtha. Baume's scale; graduated 40° to 100° Each $0.60 262 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., Hydrometers, Normal. For determining specific gravity from 0.700 to 1.850; accurate to fourth decimal. Length, 350 ram. I 2 3 Scale 0.700 to 0.760 0.760 to 0.820 0.820 to 0.880 15052. Without therm't'r, Each 2.50 2.50 2.50 15054. With therm't'r. Each 3.00 3.00 3.00 456 Scale 0.880 to 0.940 0.940 to i.ooo i.ooo to 1.060 Without therm't'r, Each 2.50 2.50 2.50 With therm't'r. Each 3.00 3.00 3.00 789 Scale 1.060 to 1. 120 I.i20toi.i8o 1. 180 to 1.240 Without therm't'r, Each 2.50 2.50 2.50 With therm't'r, Each 3.00 3.00 3.00 10 II 12 Scale 1.240 to 1.300 1.300101.360 1.360101.420 Without therm't'r, Each 2.50 2.50 2.50 With therm't'r, Each 3.00 3.00 3.00 13 14 15 Scale 1.420101.480 1.480101.540 1.540 to 1.600 Without therm't'r. Each 2.50 2.50 2.50 With therm't'r, Each 3.00 3.00 3.00 16 17 18 Scale 1.600 to 1.660 1.660 to 1.720 1.720101.780 Without therm't'r, Each 2.50 2.50 2.50 With therm't'r. Each 3.00 3.00 3.00 Scale 1.780 to 1.850 Without therm't'r. Each 2.50 With therm't'r. Each 3.00 15056. Hydrometers, Normal. Set of nineteen hydrometers same as No. 15052 in case with single thermometer. Per set $50.00 15058. Hydrometers, Normal. Set of nineteen hydrometers same as No. 15054 in case. Per set $60.00 Hydrometers, Normal. For small quantities of fluids; give specific gravity accurately to third decimal. Length, 150 to 160 mm. I 2 3 Scale 0.700 to 0.760 0.760 to 0.820 0.820 to 0.880 15060. Without therm't'r. Each 1.50 1.50 1.50 15062. With therm't'r. Each 2.15 2.15 2.15 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. oA-2 4 5 6 Scale 0.880100.940 0.940101.000 i.ooo to 1.060 Without therm't'r, Each 1.50 1.50 1.50 With therm't'r, Each 2.15 2.15 2.15 789 Scale 1.060 to 1. 120 1. 120 to 1. 180 1.180 to 1.240 Without therm't'r, Each 1.50 1.50 1.50 With therm't'r, Each 2.15 2.15 2.15 10 II 12 Scale 1.240101.300 1.300 to 1.360 1.360101.420 Without therm't'r. Each 1.50 1.50 1.50 With therm't'r. Each 2.15 2.15 2.15 13 14 15 Scale 1.420101.480 1.430101.540 1.540 to 1.600 Without therm't'r. Each 1.50 1.50 1.50 With therm't'r. Each 2.15 2.15 2.15 16 17 18 Scale 1.600 to 1.660 1.660101.720 1.720 to 1.780 Without therm't'r. Each 1.50 1.50 1.50 With therm't'r. Each 2.15 2.15 2.15 Scale 1.780 to 1.850 Without therm't'r, Each 1.50 With therm't'r, Each 2.15 15064. Hydrometers, Normal. Set of nineteen hydrometers same as No. 15060 in case with single thermometer. Per set $30.00 15066. Hydrometers, Normal. Set of nineteen hydrometers same as No. 15062 in case. Per set $43.00 15068. Hydrometer, Oil. For fatly oils. Each $0.80 15070. Hydrometer, Oil. With thermometer. Each $2.00 15072. Hydrometer, Salt Solution (Salimeter). Baume's scale .0 to 50°. Each $0.40 15074. Hydrometer, Silver Solution. Baume's scale 6° to 30°. Each $0.40 Hydrometers, Specific Gravity. For liquids lighter than water. Scale 0.600 to 0.800 0.700100.850 0.700101.000 15076. Without therm't'r. Each .60 .60 .60 15078. With therm't'r. Each 1.25 1.25 1.25 Scale 0.850 to I.ooo Without therm't'r. Each .60 With therm't'r. Each 1.25 2^A Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., Hydrometers, Specific Gravity. For liquids heavier than water. Scale i.ooo to 1:200 1.200101.400 1.400 to 1.600 15080. Without therm't'r, Each .80 .80 .80 15082. With therm't'r, Each 1.50 1.50 1.50 Scale i.6oo-*^o 1.800 1.800 to 2.000 i.ooo to 1.500 Without therm't'r, Each .80 .80 .80 V/"':' therm't'r, Epch 1.50 1.50 1.50 Scale .000 to 2.000 1.500 to 2.000 Without therm't'r. Each .80 .80 With therm't'r. Each 1.50 1.50 15084. Hydrometer, Specific Gravity and Baume's Scales. For liquids lighter than water. Specific gravity scale, 0.700 to i.ooo. Each $0.00 15086. Hydrometer, Specific Gravity and Baume's Scales. With thermom- eter. Each $1.20 15088. Hydrometer, Specific Gravity and Baume's -Scales. For liquids heav- ier tl'-in water. Specific gravity scale, i.ooo to 2.000. Each $0.60 15090. Hydrometer, Specific Gravity and Baume's Scales. With thermom- eter. Each $1.50 15092. Hydrometer. Sugar, Balling's. Haume's scale, "o to 70° in degrees. Each $0.80 15094. Hydrometer, Sugar, Balling's. With thermometer. Each $2.00 15096. Hydrometers, Sugar, Brix'. A set of three hydrometers with scales reading o to 30°, 30° to 60^, and 60° to 100° in half degrees. Per set $2.25 15098. Hydrometers, Sugar, Brix'. No. 15096, with thermometers. Per set $4.25 15100. Hydrometers, Sugar, Brix'. A set of three hydrometers with scales reading to 30°, 30° to 60°, and 60° to 100° in fifths. Per set $3.75 15102. Hydrometers, Sugar, Brix'. No. 15100, with thermometers. Per set $6.25 15104. Hydrometers, Sugar, Brix'. A set of three hydrometers with ther- mometers and scales reading 5° to 10°, 10° to 20°, 20° to 30° in tenths. JIade of Jena glass. Per set $12.00 15106. Hydrometers, Sugar'and Syrup. Baume's scale graduated in degrees. Scale to 20° o to so" Each .40 .45 15108. Hydrometers, Twaddel's. According to the Twaddel system the de- gree marks multiplied by s and added to I.ooo gives specific grav- ity. I 2 3 Scale oto24°- 24° to 48° 48° to 72° Each .35 .35 .35 456 Scale 72° to 100° 100° to 134° 134° to 180° Each .40 .40 .40 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 265 1 51 20 ISJ24 i5"o- Hydrometers, Twaddel's. Small size. I 2 Scale o to 24° 24° to 48° 48° to 72° Each •35 4 •35 S •35 6 Scale 72° to 100° 100° to 134° 134' ' to 180° I5II2^ i5ii4^ 15116. 15118. 15120. Each .40 .40 Hydrometer, Vinegar. Baume's scale. .40 Each $0.40 Hydrometer, Wine and Must. Oechsle's. With brass weight. Each $0.80 Hydrometer Jars. See Cylinders. Hydrostatic Balance. See Balances. Hygrometer, Daniell's. EUich $5.30 Hygrometer, Mason's. Each $2.50 Hygrometers, Mithof's. For determining the amount of moisture in the air. In metal case. Diameter, mm. 50 80 Each 2.25 2.75 15122. Hygrometers, Mithof's. Watch form; in case. Ignition Tubes. See Tubes. Incubators. See Bacteriological Catalogue. Each $3.25 15124. Induction Coils, Ruhmkorfl's. Primary and secondary helices, with condenser and adjustable vibrator on base. Length of spark (approx.) mm. 6 9 12 15 18 Each 6.00 g.oo 12.00 15.00 18.00 Length of spark (approx.) mm. 25 30 38 50 27^50 35^00 45.00 50.00 15126. Each Ingot Moulds. See Moulds. Ink, Diamond. For writing on glass; 25 grams in gutta percha bot- tle. Per bottle $0.50 266 Bausch &■ Lorab Optical Co., Rochester, N. Y.. U. S. A.. I5I28. I5I30. I5I32. $0.25 Each, Net $0.25 with ground rim and 15138 15136 15140 Ink, Higgins'. Black; waterproof; in quill-stoppered bottle. Each, Net Ink, Higgins'. Red. Jars, Aquarium. Of heavy, clear white glass groove near top. Capacity, liters 2 4 6 8 16 32 Height, mm. 135 160 19s 210 280 350 Diameter, mm. 145 200 230 250 300 380 Each .30 .60 .75 i.oo 2.40 5.00 15134- Jsrs, Aquarium. Oblong; of heavy, clear white glass. Capacity, liters 10 20 Length, mm. 270 330 Height, mm. 270 330 Width, mm. 165 200 Each 2.80 5.75 Jars, Battery. See Battery Jars. Jars, Culture, Novy's. For tube cultures of anaerobic bacteria by gas or pyrogallate methods. Consists of ^ glass jar with inlet and outlet tubes in neck, and hollow stopper, having tube reaching to bottom of jar and handle for turning, ground into neck. See Jour- nal of Applied Microscopy, Vol. II., No. 2. Height, mm. 150 200 Diameter, mm. 80 100 15136. Each 2.50 3.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 267 •il ik ^••^•^\,\3\%., I5IS0 1SI52 I5IS6 ISI38. I5I40- I5I42- 1 5144- 15146. 1 51 48. 1 51 50. 15152- Jar, Culture, Novy's. For plate cultures of anaerobic bacteria by gas or pyrogallate methods. Similar in construction to No. 15136 but in two sections to permit the use of Petri dishes. The section.s have wide ground flanges which with rubber band between form air-tight connection being held by three metal clamps. This jar may also be used as a desiccator for drying in a current of hydro- gen or other gases. Lower section; height, 150 mm.; diameter, 140 mm. See Journal of Applied Microscopy, Vol. 11, No. 2. Com- plete with rubber band and three clamps. (See page 267.) Each $5.75 Jar, Culture, Novy's Improved. For plate cultures of anaerobic bac- teria by vacuum, gas, or pyrogallate methods. The feature of ex- cellence over other jars is the addition of a stop cock supported horizontally by glass tubes on the regular stopper which relieves the latter from pressure and allows the vacuum method to be eas- ily employed. Otherwise same as No. 15138. Complete with band and three clamps. (See page 267.) Each $7.50 Jar, Culture, Novy's Improved. Bands, of rubber, for above culture jars. Each $0.15 Jar, Culture, Novy's Improved. Clamps for above culture jars. Each $0.25 Jars, Cylinder. Of clear white glass; with flat bottom, ground rim, and loosely fitting cover. Height, mm. 130 180 180 Diameter, mm. 65 80 100 Each .28 •45 .60 Jars, Cylinder. Of heavy, clear white glass; with loosely fitting cover, and cut and polished knob. These are very fine jars. Height, mm. 100 I2Q 150 210 260 Diameter, mm. 100 120 150 210 260 Each .go i.io 1.55 2.50 3.40 Jars, Cylinder. Of heavy, clear white glass; with foot, polished rim, and loosely fitting cover. Height, mm. 100 120 150 210 260 Diameter, mm. 100 120 150 210 260 Each .70 .90 I -25 3.00 Jars, Decanting. Of heavy, clear white glass; with three tubulatures. Capacity, liters 2 4 Each 1-25 1.50 268 Bausch Sr Lomb Optical Co., Rochester, N. Y., U. S. A., 15164 15168 15174 ISI58 15160 15162 isi66 ISI54- Jars, Decanting. Of porcelain; with eight tubulatures. Capacity, liters 4 8 12 Each 3.50 5.00 7.00 15156. Jar, Embryo. Blown from glass tubing, extra quality; with stopper. Capacity, 15 cc. Per ten Jars, Hydrometer. See Cylinders. Jars, Nessler. See Colorimetric Determin.\tion Apparatus. 15158. Jars, Precipitating. With pour-out. Capacity, cc. 125 250 500 liters 1246 15160. cork $1.00 Each ■15 -25 -35 .50 .65 1.20 1.80 2.70 Jars, Preparation. Of clear white glass. with foot, neck, and ground glass stopper. Height, mm. 80 100 120 ISO 180 200 Diameter, mm. 30 30 40 SO 60 80 Each .25 .35 .35 15162. Jars, Preservation (Lightning). Capacity, cc. 500 750 •50 •65 ■75 Each .14 .15 .16 .20 15164. Jars, Preservation. Of clear white glass; with glass cover fitting air- tight, by rubber band and held in place by metal ring with flange which screws down upon cover. A good jar for collecting and pre- serving museum specimens and anatomical material. Capacity, cc. 250 500 1000 2000 Each .08 .12 .14 .20 15166. Jars, Preservation. Of clear white glass; with mouth of jar same size as body. The cover is of glass, fitting air-tight by rubber band and held by spring clamp. Capacity, cc. 30 200 250 400 600 Per ten ies iSs ^o ii20 ^85 15168. Jars, Screw Capped. Of clear white glass; with metal, screw cover. Capacity, cc. 30 60 120 2S0 SOO Per ten .40 .50 .75 .85 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 1.05 269 I5I70 ISI72 isiys 15176 15170. 15172. Jars, Specie. With lacquered tin cover. Capacity, cc. 50 1000 2000 4000 Each Jars, Specimen. Of clear white glass stopper carefully ground-in. Capacity to neck, cc. 45 75 go Diam. of mouth, mm. 30 30 40 Diam. of body, mm. 40 40 50 Height to shoulder, mm. 50 75 65 Height to top of stop'r, mm. 90 115 no .18 .25 .35 .50 with extra wide mouth. Glass 150 40 SO 95 140 180 40 SO 125 170 250 SO 6S 90 140 330 50 65 I2.T 175 15174- Each .21 .22 .24 .26 •30 •33 •35 Capacity to neck, cc. 500 420 600 850 870 1200 1560 Diam. of mouth, mm. 50 65 65 65 75 75 75 Diam. of body, mm. 65 75 75 75 95 95 95 Height to shoulder, mm. 175 100 150 200 150 200 250 Heightto top of stop'r, mm. 22s 160 210 260 215 265 313 Each .38 .42 •45 •52 •58 •75 .go Capacity to neck, cc. 140 i860 2760 2880 4200 5000 6360 Diam. of mouth, mm. 90 90 90 125 125 125 125 Diam. of body, mm. 115 115 IIS ISO 150 150 ISO Height to shoulder, mm. 125 200 300 175 250 300 375 Heightto topof stop'r, mm. 195 270 375 250 330 380 460 Each •75 .90 1.12 1-35 1.72 2.00 2.30 ars. Specimen. Mouth same size as body; with rubbei band and metal clamp, and two glass suspension rings on under s de of glass cover. Capacity (approx.), cc. 250 375 500 750 1 125 875 1250 Width of mouth, mm. 55 55 55 55 55 90 90 Height, without cover, mm 100 ISO 200 300 450 150 200 Each .36 .40 •44 •50 .62 .64 .72 Capacity (approx.), liters 2 3 2^ 4 5 6 Width of mouth, mm. 90 90 130 130 130 130 Height, without cover, mm. 300 450 200 300 •375 450 Each I.OO I.I2 1.25 1.38 1.55 270 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. iV., 1 51 88 15184 15182 15186 Capacity (approx.), liters Width of mouth, mm. Height, without cover, mm. 4 160 200 160 300 AV2 19s ISO 6 195 200 9 195 300 II 195 375 Each Capacity (approx.), liters Width of mouth, mm. Height, without cover, mm. Each 145 14 19s 450 1.65 18 195 600 2.00 28 195 900 2.15 17 29s 300 2.50 29 29s 450 2.70 40 295 600 2-95 3-40 5-95 7-15 8.95 10.70 I5I76- Jars, Specimen. Of clear white glass, free from imperfections; with foot, lip, and stopper-like cover ground in air-tight. Height mm. 100 .120 120 130 150 180 Diameter, mm. 75 30 50 75 100 120 Each •50 .35 -45 -DO i.oo 1.25 15178. Jars, Specimen. Of heavy clear white glass; with ground flange. Height, mm. 80 100 120 120 130 Diameter, mm. 25 40 30 50 75 Each .12 ■15 .16 .20 .40 Height, mm. 150 180 230 300 Diameter, mm. 100 120 180 250 Each .60 .75 1.50 3.50 Of heavy, clear white glass; with carefully ground, 15180. Jars, Specimen. air-tight cover. Height, mm. Diameter, mm. 80 130 ISO 180 250 140 100 200 180 220 15182. 15184. Each 1.15 .90 3.00 2.50 4.50 Jars, Specimen. Inverted form; of clear white glass; with carefully ground, air-tight stopper which serves as pedestal on which the jar rests. Height, mm. 130 igo 220 320 Diameter, mm. 50 80 100 120 Each .40 1.00 1.15 1.90 Jars, Specimen. Inverted form; similar in form to No. 15182 but of ordinary quality; for cork stopper. Nrw York, Boston, Chicago, U. S. A., F"rankfurt a/M., Germany. 271 1 5204 201 15198 •11 Height, mm. 95 no 130 I9S 230 280 Diameter, mm. 40 50 65 70 90 no 355 145 15186. Each .10 .13 .15 .20 .30 .50 i.oo Jars, Stone. For refuse; with two handles and cover. Capacity, liters 8 16 24 " 30 40 Each .70 1.20 1.70 2.00 Jars, Staining. See Staining Jars. 15188. Kettles, Agateware. With cover. (See page 271.) Capacity, liters 3 4 5 2.50 15190. 272 Each .60 .70 .75 .90 Kettles, Porcelain. Glazed inside. (See page 271.) Capacity, liters 7 12 20 Height, mm. ■ 200 270 330 Diameter, mm. 270 315 350 Each 3.75 6.00 12.00 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., i52o8 15210 15212 15206 15192. 15194- 15196. 15198. Kjeldahl Apparatus. See Gas Apparatus for Nitrogen Determination. Knife, Amalgam. For cleaning amalgam plates; with handle; blade 75 mm. wide. Each $0.70 Each $0.15 Each $0.15 Knife, Cork. For cutting cork. Knife, Potato. Labels, Gummed. Of superior quality; printed on white paper, with red border. Number 223 217 213 209 205 201 Length, mm. 20 25 30 35 45 65 Width, mm. 15 20 25 28 35 40 Per twelve boxes .66 .66 .66 .66 .66 .66 Number 259 261 219 241 239 229 Length, mm. 33 SO 40 22 30 42 Width, mm. 15 IS 20 IS 18 30 Per twelve boxes .66 .66 .66 .66 .66 .66 15200. Labels, Gummed. In books. Gummed labels, with red border and rounded corners; in sheets, perforated, bound in book form. Size of sheet, 210 x 120 mm. Numbers 225 223 221 219 217 Labels, per book 1575 1400 1050 750 750 Per book Numbers Labels., per book •35 -as -35 -35 -35 213 209 205 201 750 500 300 225 Per book Labels, Microscopical. labels. 15206. Labels, Microscopical. 15208. Labels, Microscopical. I52IO. Labels, Microscopical. I52I2. Labels, Microscopical. Labels, Microscopical are printed on best •35 -35 ^35 -35 Best white gummed paper. In boxes of 100 Square. Size, 22 mm. Per thousand $0.75 Rectangular. Size, 22 x 15 mm. Per thousand $0.75 Oval. Size, 20x14 mm. Per thousand $0.75 Circular. Diameter, 16 mm. Per thousand $0.75 In books of 500 labels each. These labels white gummed paper, same as Nos. 15206 and New York, Boston, Chicago, U. &. -\., Frankturt a/M., Germany. 273 15228 15224, 15226 iS2o8, and are scored so as to be readily torn from the book, leav- ing clean edges. Interleaved with paraffin paper. They are much more convenient than the cut labels. 15214- 15216. 15218. 15220. 15222. 15224- Labels, Microscopical. Square Labels, Microscopical. Rectangular. Same as No. 15208. Same as No. 15206. Per book $0.30 Per book $0.30 Label Book. Contains the names and formulas of the most used chemicals and reagents. Printed on good paper, gummed and perforated, and bound in book form. Per book $0.40 Lactoscopes, Lactobutyrometers, Lactometers, etc. See Milk Test- ing Apparatus. Ladles, Agateware. Agate nickel-steel; snipe lipped. Diameter, no mm.; depth, 40 mm. Each $0.40 Ladles, Agateware. Flint enameled; acid proof. Each $0.60 15226. 15228. 15230- 15232. Ladles, Melting. Of cast iron. Especially adapted to Furnace No. 14538. One handle fits the three different sizes. Prices are for ladles Vi^ithout handles. Diameter, mm. 100 105 no Depth, mm. 55 65 65 Each .30 .42 .48 Ladles, Melting. Handle for No. 15224. Ladles, Wrought Iron. With lip. Diameter, mm. 65 75 100 125 Each $0.30 150 Each •25 -30 •35 .60 -85 Lamps, Alcohol. Of polished brass; with screw top and metal cap. Capacity, cc. 60 125 250 Each •45 •50 -55 Lamps, Alcohol. Of polished brass; with screw top, metal cap, and ratchet burner. Capacity, cc. 125 200 Each .40 -45 274 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 15230 15232, 15234 15250 1524a 15246 15240 15244 15236, 15238 15234- 15236. 15238. 15240. 15242. 15244. 15246. Lamps, Alcohol. Nickel plated. Capacity, cc. 125 Each .50 .55 Lamps, Alcohol. For blowpiping. Made of polished brass. Wick- holder lifts out and can be adjusted to any angle. Each $0.85 Lamps, Alcohol. Nickel plated. Each $0.95 Lamps, Alcohol. Of brass. Capacity, 200 cc, wick included. Each $0.20 Lamps, Alcohol. Bowl shape; with foot. Of clear white glass, with metal burner and glass cap ground on. Wick included. Capacity, cc. 30 60 100 150 Each .40 .45 .50 .55 Lamps, Alcohol. Cylindrical. Of clear white glass, with metal burner and glass cap ground on. Wick included. Capacity, cc. 30 60 100 150 Each .40 .45 .50 .55 Lamps, Alcohol. Cylindrical. Of glass, with metal burner and glass cap ground on. Side tube, with glass stopper for filling. Capacity, cc. 30 60 100 150 Each .50 .55 .60 •65 2^ew York, Boston, Chicago, U. S. A,, Frankfurt a/M., Germany. 275 15248 15260 15248. Lamps, Alcohol. Of glass, with metal burner and metal cap. shape is such that the lamp may be set at various angles, included. Capacity, cc. 40 120 120 Diameter of burner, mm. 5 7 12 Each 15250. Lamp, Davy's Safety, or Miners'. 15252. 15254. The Wick .70 .85 1. 00 Of Brass. (See page 275.) Each $5.00 Each $3.50 Lamp, Doebereiner's Hydrogen. Lamps, Parting. For alcohol. Designed by H. W. Leavens, and made of galvanized iron; very strong; with ratchet burners and shelves for sand bath and annealing cups; upper shelf perforated for holding test tubes. Number of burners 6 8 12 15256. 15258. 15260. Each 3.75 4.30 5.40 Lamps, Parting. Same as No. 15254, but without upper shelf, so as to admit use of flasks instead of test tubes, and with hood and pipe attached for carrying off fumes. Number of burners 6 8 12 Each 4.50 5.50 7.50 Lamp, Welsbach. Consists of brass frame to attach to gas pipe, mantle, and glass chimney. This is the genuine Welsbach lamp. Each $o.So Lamp, Welsbach. The Welsbach light, being very brilliant, steady, and white, is especially adaptable to microscopical work where an artificial light is required. This lamp consists of a support, with neatly japanned base, to which the burner is attached by adjust- able clamp; the burner may thus be adjusted to any desired height or angle. Around the burner is a black metal chimney, shielding 276 Bausch &■ Lomb Oplical Co., Rochester, N. Y., U. S. A., 15270 15256 the eyes from the intense glare of the light, and provided with a bulls-eye lens so adjusted as to project a beam of parallel rays onto the microscope mirror. Height of support, 200 mm.; diam- eter of bulls-eye lens, 40 mm. Complete, with metal chimney and bulls-eye lens. Each $6.00 15262. Lamp, Welsbach. Without bulls-eye lens. Each $4.50 15264. Lamp, Welsbach. ilantles for Nos. 15260 and 15262. Each $0.25 Lamps, Other Forms. See Burners, Blast Lamps, and Stoves. Lamp Wicking. A wick of any size is obtained by using the requi- site number of strands. Per bundle $0.05 Lead Baskets. See Baskets. Lead Dishes. See Dishes. Lead Foil. See Foil. Lead Shot. For cleaning bottles. Per five hundred grams, Net $0.10 15266. 15268. LECTURE APPARATUS, HOFFMAN'S We list below the most salable of Prof. Hofmanns apparatus, but will supply any piece not listed on order. See his "Introduction to Modern Chemistry." Any other form of lecture apparatus will be furnished on order. Prices on application. 15270. Apparatus for the electrolytical decomposition of hydrochloric acid, water and ammonia. Complete with platinum electrodes and support. Each $6.25 15272. Glass parts only, for No. 15270. Each $3.00 15276. Apparatus for the simultaneous electrolytcal decomposition of hy- drochloric acid, water and ammonia, to show th.at one volume of hydrogen is combined with on^ volume of chlorine in hydrochloric acid, with one-half volume of oxygen in water, and with one-third vo!' me of nitrogen in ammonia. Complete, with supports. Each $42.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 277 15276-15282 15284, 15286 15278. 15280. 15282. 15284. 15286. 15290. 15292. 15294. 15296. 15298. 15300- Tube with two stop cocks and platinum electrodes. Each $5.00 Tubes with carbon electrodes. Each $5.25 Supports, with binding screws for the poles. Each $9.00 Apparatus for determining the quantity of hydrogen in one volume of hydrochloric acid. Complete, with support. Each $7.00 Glass parts only, for No. 15284. Each $4.00 Apparatus for demonstrating that one volume of chlorine combined with one volume of hydrogen produces hydrochloric acid. Com- plete, without battery. Each $11.50 Tube with two stop cocks. Decomposing cell. Calcium chloride cylinder. Cylinder with enlarged top. Each $3.00 Each $5.00 Each $0.75 Each $1.50 Apparatus for demonstrating that by the combination of hydrogen and chlorine to form hydrochloric acid there is no alteration of volume, i. e., that from one volume of hydrogen and one volume of chlorine two volumes of hydrochloric acid are produced. Com- plete, with support. Each $5.25 278 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 15290-15298 iS3i6 15302. Glass tube only for No. 15300. Each $3.25 15306. Apparatus to prove the invariable composition of hydrochloric acid. Complete. Each $5.00 15308. Tube alone, far No. 15306. Each $3.50 15310. Apparatus to demonstrate that in the combination of hydrogen and chlorine into hydrochloric acid there is no condensation. Com- plete, without mercury. Each $2.00 15312. Apparatus for the decomposition of water by electrolysis, and the collection of the gases in separate graduated tubes. With sliding tubes. Each $1.50 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 279 IS324 1533° I53I4- I53I6. I53I8. 15320. 15322- 15324- 1 5326; 15330- 15332. 15334- 15338- Apparatus No. 15312 on foot. Each $2.00 Apparatus for the decomposition of water by electrolysis, and the collection of the gases in separate graduated tubes. With glass stoppers. (See illustration, page 279.) Each $2.00 Apparatus No. 15316 on foot. Each $2.50 Apparatus for demonstrating that water is composed of one volume of oxygen and two volumes of hydrogen. Complete, with plati- num electrodes and support. Each $8.50 Glass parts only, far No. iS32a Each $5.50 Apparatus same as No. 15320, but with tube with graduated arms. Complete, with platinum electrodes and support. Each $10.50 Glass parts Ofily, for No. 15324. Each $7.50 Apparatus to demonstrate that hydrogen and oxygen are combined in the same proportion as they are liberated in the electrolysis of water. Complete, with supports. Each $20.00 Tubes with two glass stop cofks; without support. Each $4.00 Tube with lower stop cock; without support. Each $3.00 Apparatus (Lecture Eudiometer) for the decomposition and recom- position of water. Complete, with platinum electrodes and sup- port. (See illustration, page 281.) Each $10.00 15340. Glass parts only, for No. 15338. Each $6.00 280 Bausch & Lomb Optical Co,, Rochester, N. Y., U. S. A., 1 5338 15344, 15346, 15348 15350 15356 15344- 15346. 15348. 15350. 15352. 15356. Apparatus to demonstrate that ammonia is composed of one volume of nitrogen and three volumes of hydrogen. Complete, as illus- trated. Each $7.50 Tube with glass stop cock, rubber stopper, and delivery tube. Each $3.50 Cylinder with porcelain base. Each $4.00 Apparatus for demonstrating the combination of three volumes of hydrogen with one volume of nitrogen into two volumes of am- monia. Complete, with support. Each $6.00 Glass parts only, for No. 15350. Each $4.00 Apparatus to demonstrate that oxygen contains the same volume as the carbonic acid and the sulphurous acid produced from it. Complete. Each $9.00 15358. Tube only, for No. 15356, 15360. Each $6.00 Apparatus for illustrating the phenomena of combustion. Complete, with support. (See illustration, page 282.) 15362. Tube only, with platinum burner and two glass stop cocks. Each $5.00 15364. Apparatus to demonstrate the increase of weight in combustion. Complete, without mercury. (See illustration, page 282.) Each $2.50 New York, Boston, Ciiicago, U. S. A., Frankfurt a/M., Germany. 15368 15378 15360, 15362 15370 15376 15374 IS366. Apparatus for illustrating the combustion of one gas in another. Each $1.60 15368. Apparatus to demonstrate that steam is lighter than air. Each $1.35 15370. Apparatus to demonstrate the relations between water in liquid and in gaseous form. Complete, with support. Each $3.50 15372. Glass parts only, for No. 15370. Each $3.00 1 5374- Apparatus for illustrating the maximum density of water. Each $10.00 282 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., IS382, 15384 I5376' Apparatus for experiments with liquid sulphurous acid. Each $5.50 15378. Apparatus for demonstrating the manufacture of sulphuric acid. Complete, with support. Each $8.50 15380. Glass parts only, for No. 15378. Each $5.50 Lenses, Demonstration. These lenses show the forms of the various elementary lenses and demonstrate their optical principles. The edges are ground smooth, and polished. 15382. Lenses, Demonstration. Set of six lenses, viz. : double convex, double concave, piano convex, piano concave, meniscus convex, and men- iscus concave; in box. Diameter of lenses, mm. 37 50 75 Per set 1.25 2.50 4-5° 15384. Lenses, Demonstration. Set of ten lenses, viz.: double convex, double concave, piano convex, piano concave, meniscus convex, meniscus concave, cylindrical convex, cylindrical concave, sphero- cylindrical, and prismatic. Diameter of lenses, mm. zj 50 75 Per set 2.00 Lenses, Double Convex or concave. Ground Edges 3-50 7-50 Perfectly Centered Catalog. Diam. Focus Catalog. Diam. Focus Number mm. mm. Each Number mm. mm. Each 15386 1-5 3 $0.75 15412 1-5 3 $1.00 15388 3 6 •75 15414 3 6 1. 00 15390 5 10 •75 1 541 6 5 10 1. 00 15392 6 13 .go 15418 6 13 1. 00 15394 10 19 .90 15420 10 19 1. 00 15396 13 25 ■90 15422 13 25 1. 00 15398 16 32 .90 15424 16 32 1-25 15400 19 38 .90 15426 19 38 1.25 15402 25 51 .go 15428 25 SI 1^25 15404 38 76 .50 15430 38 76 •8s 15406 50 102 .60 15432 SO 102 •95 15408 62 127 •75 1 5434 62 127 1^25 15410 75 152 I^25 15436 75 152 1^75 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 283 1 5550. 15552- Lenses, Double Convex or Concave — Large Diameter. mm. cms. Each mm. cms. Each 15438 100 30 -182 2.00 15448 100 30-183 2.50 15440 125 46 -183 3.00 15450 I2S 46-183 3-75 15442 150 6i- -183 4.00 15452 ISO 61-183 5.J0 15444 175 76 -183 6.00 15454 175 76-183 7.5J 15446 200 91 -183 8.00 15456 200 91-183 10.00 Lenses, Meniscus Convex or Concave. mm. mm. Each mm mm. Each 15458 25 50 . 1.50 15468 25 SO 2.U0 15460 38 75 1.75 15470 38 75 2.25 15462 SO 100 2.00 15472 SO • 100 2.50 15464 62 125 2.50 15474 62 125 3.00 15466 75 ISO 3.00 15476 75 ISO 3./ 5 Lenses, Meniscus Convex or Concave — Large Diameter. mm, 100 cm 30- IS. Each mm. cms. Each 15478 ■183" 4.00 15488 100 30-183 5.00 15480 I2S 46- •183 6.00 15490 125 46-183 7.50 15482 150 61- 183 8.00 15492 ISO 61-183 10.00 15484 I7S 76-183 10.00 15494 17s 76-183 12.00 15486 200 91- ■183 12.00 15496 200 . 91-183 15.00 Lenses, Piano Convex or Concave. mm. mm. Each mm mm. Each 75498^ i-S 3 •65 15524 i-S 3 .90 15500 3 6 .65 15526 3 6 •90 15502 5 10 •65 15528 5 10 .90 15504 6 13 •75 15530 6 13 1. 00 15506 10 19 .75 15532 10 19 I. CO 15508 13 25 •75 15.534 13 25 1. 00 15510 16 32 •75 15536 16 32 I.IO 15512 19 38 •75 15538 19 38 I.IO 15514 25 38 •75 15540 25 51 I.IO 15516 38 76 .85 15542 38 76 1.25 15518 50 100 1. 00 15544 50 100 1.40 15520 62 I2S 1. 25 15546 62 1 25 1.75 15522 75 ISO 1.50 15548 75 ISO 2.0'J Lenses, Prisms. See Prisms. Lenses, Magnifying. See Magnifiers, Microscopes, Readers. Lenses, Photographic. See Catalogue of Photographic Lenses. Lens Paper, Japanese. For cleaning lenses; does not easily collect dust nor become greasy or harsh. It is very soft and free from im- purities. Recommended for use with our lenses. In packages of 100 sheets. Size of sheet, mm. 185x275 275x275 Per package Letters. Of steel; for alphabet. Face, mm. i}^ .25 stamping steel 3 A^A .45 iron, bullion. etc. Full Per set 2.25 2.30 2.75 3.00 4.00 5.50 7.00 284 Bausch & Lomb Ojitical Co., Rochester, N. Y., U. S. A., 15554 15560 IS552 15.558 15564 Letters, Steel Figures. See Figures. IS554- Levels. Of iron, japanned. Length, mm. no 140 170 15556- Levels. Each Of brass. Length, mm. •35 .40 130 •50 150 Each •so .60 ■75 15558. Level. Round; best quality; in brass case. For balances, bacterio- logical work, etc. Diameter, 30 mm. Each $2.00 i5559^ Levels. Round; best quality; in brass case; with screw for attach- ment to balance case. Diameter of face, mm. 20 30 Each 1.50 15560. Level. Round; in brass case, nickel plated. Diameter, 15 ram. Each $0.50 Lime Cylinders. See Chalk Sticks. Litmus Paper. See Test Paper. Litmus Pencils. See Pencils. 15562. 15564- Magnets, Bar. Of steel; best quality. Length, mm. 100 125 150 250 Each ■25 •30 •35 .40 •50 Magnets, Horseshoe. Best English steel; very powerful; with armature. Length, mm. 50 75 100 125 150 200 250 300 Each .08 •15 -25 .50 i.oo 1.75 2.50 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 285 15576, 15584 I 5566-1 5574 Magnifiers, Achromatic Triplet. These lenses are thoroughly achro- matic, being composed of a very thick crown lens cemented be- tween two flint lenses. The field is large and flat and the image sharply defined and free from all color. The mountings are Ger- man silver, nickel plated. These lenses are the very best through- out, optically and mechanically. Catalogue Number. Diameter in. mm. Magnification Diameters. Focus in. mm. Each. 15566 Va 6 40 Va 6 $4.00 15568 Vs 10 20 y^ 12 4.00 15570 % 12 14 Va 18 4.00 15572 H 15 10 I 25 4.00 15574 Va 18 7 i^ 38 4.00 Magnifiers, Aplanatic Triplet, Hastings'. After formulae by Prof. Chas. S. Hastings. These are the best Magnifiers obtainable any- where and offer advantages found in no other hand magnifiers. They are very small and compact and are therefore especially adaptable where it is desired to carry a magnifier in the pocket constantly. The field embraces a wide angle and the image is sharp and clear to the very edge. The working distance is very large, and the definition is such as to show structure not visible with other magnifiers of equal magnification. The mountings are German silver and of exceptionally fine workmanship. Catalogue Diameter Magn ification Fo cus Real Field Number. in. mm. Diameters. in. mm. mm. Each. 15576 Va 6 20 H T2 8 $7.00 15578 Vs 10 14 Va 18 14 7.00 15580 /2 12 10 I 25 20 7.00 15582 Va 18 7 I'A 38 30 7.00 15584 I 25 S 2 so 40 7.00 286 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 15586 15602 15604 Magnifiers, Coddington. The Coddington magnifier is a cylinder of glass cut from a solid sphere and having a groove equally distant from the surfaces, which acts as a diaphragm and reduces aberra- tion, giving clear and perfect definition. The lenses listed here are real Coddingtons. The mountings are neatly finished and nickeled. Catalogue Number. Diameter in. mm. Focus in. mm. Each. 15586 15588 15590 15592 V2 12 H 15 H 18 I 25 'A 12 $1.50 Va 18 1.50 I 25 1-75 1/2 38 2.00 Magnifiers, Coddington. To meet the demand for Coddington lenses at a lovirer price than it is possible to make the best grade for, we list these lenses. They are not so high quality optically as the pre- ceding but are far superior to the foreign made magnifiers offered as Coddingtons. The mountings are well made and the lenses are of clear glass carefully ground and polished. Catalogue Diameter Fo cus Number. in. mm. in. mm. Each. 15594 V4 18 Va 18 $1.10 15596 I 25 I 25 1-25 15598 1% 28 1K2 28 1.50 15600 iVs 34 2 SO 1-75 15602. Magnifier, Doublet. This magnifier is composed of two separated plano-convex lenses. The field is large and flat and the definition excellent. The mounting is thoroughly well made, neatly finished and nickel plated. The Doublet magnifier is recommended wher- ever a good low priced lens is required. Diameter of lens, 15 mm. (5^ in.); focus, 18 mm. (^ in.). Each $1.25 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 287 I56I6 15628 15636 15644 Magnifiers, Pocket. In vulcanite mounting. Our pocket magnifiers have always been considered the standard. They have superseded those of foreign manufacture mounted in horn, etc., as the vulca- nite which we employ for mountings is much preferred on account of its greater permanence, lightness, and neat appearance. The lenses used are accurately ground and give good results. Catalog. Diameter Price Catalog. Diameter Number. in. mm. Each. Number. in. mm. Each. Oval Shape. One Lens. 15604 54 18 $ .20 15610 l'/2 38 $ .50 15606 I 25 .30 1 561 2 154 42 .60 15608 -Va 30 .40 Oval Shape. 1 561 4 Two Lenses. 2 50 •75 15616 %, 54 15, 18 $ .40 15622 ii4, 1/2 30, 38 $ .80 1 561 8 H I 21, 25 .50 15624 lYz, 154 38, 42 1. 00 15620 iH I'A 28, 30 .65 Bellows Shape 15626 154, One Lens. 2 42, 50 1.25 15628 54, 18 .20 15632 I 25, .30 15630 Vs, 21 .25 Bellows Shape. 15634* 54 Two Lenses. 18, •25 15636 Vs, 54 15, 18 .35 15640 H, I 21, 25 •50 15638 54, H 18, 21 .40 Bellows Shape. 15642* ys, Three Lenses. Va IS, 18 .40 15644 /2, H, ^ 12, 15, 28 .50 15648 54, Vb,i 18, 21, 25 .80 15646 Vs }i, y/s 15, 18 21 .60 15650* ;4, H,% tI2, 15, 18 .60 * Nos. 15634, 15642, and 15650 have diaphragm which increases the definition of the lenses. Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., IS668, 15670 15660 15666 Magnifiers, Pocket (Linen Testers). These magnifiers, often called linen testers, fold up to occupy the smallest possible space. The lens gives about ten diameters magnification and is focused on the opening in the base so that the magnifier is simply set over the ob- ject. The mountings are nickel plated. Catalogue Number Opening Size Shape Each 15652. 15654- 15656. 15658. 15660. 15662. 15664. 15666. 15668. m. mm. YiyiYi I2X 12 ^ X ^ 6x 12 Magnifiers. See also Microscopes, Mallets. Hard wood. Mallets. Raw hide. Manganese Comparison Color Tube. Square Rectangular Reading Glasses. Each Each Designed by J. M. Camp. Each Manometers. See Gauges. Marsh's Apparatus for Detection of Arsenic. See Arsenic Apparatus. Mattrasses. Of hard Bohemian glass. Each $0.08 Mattrasses. Of German glass; for blowpipe work. Each $0.05 Measures, Agateware. Agate nickel steel; for liquids. Capacity, pints Vi, Vz I 248 ■25 .25 $0.25 $1.25 $6.50 Each Measures, Copper. Capacity, pints .30 .40 .50 For liquids; with handle. 54 y^ I .70 .90 Each ■55 .70 .90 1.85 2.25 New York, Boston, Chicago, U. S. A,, Frankfurt a/M., Germany. 15680 15690 15688 15678 15684 \ / L r3C 15670. 15672. 15674- 15676. 15678. 15680. 15682. 290 15682 Measures, Glass. See Graduates. Measures, Tin. For liquids. (See illustration, page 289.) Capacity, pints ^^124 8 Each .15 .20 .25 .30 .50 .65 Measure. Of wood; graduated on one side in millimeters to 30 cen- timeters, on the otlier in Sths inch to 12 inches. Each $0.20 Measure, Boxwood. With square, brass-bound edges and ends. Grad- uated to i6ths inch on both edges of one side, and to Sths inch on the other side. Length, 24 inches. Each $3.00 Measure, Boxwood. With brass edge; graduated to Sths inch. Length, 12 inches. Each $0.45 Measures, Folding Caliper. Boxwood rule graduated on one side in millimeters and on the other in i6ths inch. Length of scale, mm. 150 300 Each Measures, Micrometer Screw Caliper. complete revolution is equivalent Graduated to o.oi mm. Scale reading from o to mm. .25 .40 Of steel, nickel plated. One to one millimeter thickness. 10 IS 20 Each 1.75 2.00 2.25 Measures, Vernier Caliper. Of steel; graduated in millimeters to 10 centimeters; with vernier reading to o.i mm. Each $1.50 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 15698 15700 15702 15692 !Wri^W'''?^rt^^!i LONDON 1 2 vMi itititif JMIi 23'2|4 25'2|6 2 7 ■ 21S ■ 2|9 3|0 1 , 9 , 1 «-.='■> ll-t^MW; ffl iiiiiiiiiiiiniiniiiiiiiiiiii ililifilnrlTiil . 15694, 15696 15684. Measure, Vernier Caliper. Of steel, nickel plated; graduated in milli- meters, with vernier reading to o.l mm., and in inches divided to i6ths inch. Length, 20 centimeters, with square ends. Each $2.00 15686. Measure, Vernier Caliper. With steel points. Each $2.50 15688. Measure, Caliper. Of steel; for inside and outside measurement; plain. (See illustration, page 290.) Each $0.50 15690. Measure, Caliper. Graduated in millimeters to 80 mm., and in i6ths inch to 3 inches. (See illustration, page 290.) Each $1.25 15692. Measuring Cones. Of steel, nickel plated; for measuring holes. Scale divided to 0.1 mm. Scale, mm. i to 15 151030 301045 Each .75 1. 00 1.50 15694. Measure, Steel Rule. Of steel, hardened and tempered. English scale; graduated to 4ths, 8ths, i6ths, 32ds, and 64ths inch. Length, 6 inches. Each $0.40 15696. Measure, Steel Rule. Of steel, hardened and tempered. English and metric scales; graduated on one side to 0.5 mm. and 8ths, i6ths, 32ds, and 64ths inch, and on the other to loths, I2ths, 20ths, 24ths, 48ths, soths, 96ths, and looths inch. Length, 6 inches (150 mm.) Each $0.80 15698. Measures, Tape. Of linen, in heavy nickel plated case with spring. Graduated on one side in 8ths inch and on the other in millimeters and centimeters. Length, meters i 2 Each .25 .40 15700. Measures, Tape. Of steel, in heavy nickel plated case with spring. New York, Boston, Chicago, U. S. A.. Frankfurt a/M., Germany. 291 Graduated on one side in i6ths inch and on the other in millimeters and centimeters. Length, meters 125 Each .75 1.00 3.25 15702. Melting Point Apparatus, Roth's. (See illustration, page 291.) Capacity, cc. 150 250 500 Each 2.00 2.25 2.50 Mercury Troughs. See Troughs. Microscope, Chamot Chemical. This microscope is intended for mi- cro-chemical examinations of all kinds, and is constructed after specifications by Professor E. M. Chamot. The production of a suitable instrument at the very reasonable price at which we are able to offer it adds much to the possibilities of micro-chemistry in our universities and colleges, as well as for the individual worker. This microscope is also specially adapted for the examination of food stuffs suspected of containing adulterations. The stand is of brass throughout, base large, pillar solid, screw substage. Fine adjustment is our standard triangular bar form, coarse adjustment by standard diagonal rack and pinion. The polarizer may be swung out from the optical axis if desired, and quickly raised and lowered. The mounting has stop indicating zero point. The analyzer is in revolving mounting, with circle grad- uated in degrees, and fits over the eye-piece. It can be lifted off for quickly changing eyepieces. All eyepieces are fitted with cross hairs and have a pin at the side, which fits into a recess at the top of draw tube, for lining the cross hairs. The analyzer mounting is fixed to the draw tube by a stud and recess. This permits changing of eyepieces and replac- ing of analyzer, so that the prisms are crossed without further ad- justment. The draw tube has vertical adjustment, but rotation is prevented by means of a stud on the draw tube traveling in a ver- tical gi-oove in the body tube. The stage revolves, and has cen- tering screws by which the object may be centered to the axis of rotation. The surface is of vulcanite, not affected by ordinary fluids. The circumference is graduated to degrees. Only low- power objectives are listed with this stand, as the higher powers come so near the fluids as to be liable to erosion. To guard against any deterioration of the lenses, even in the low powers, a number of thin glass circles are supplied which are to be cemented to the front of the objective with pure gylcerine and changed as often as they become clouded. The desired magnification is obtained by use of higher power eyepieces. Each M Microscope is furnished in polished wood car- rying case, with handle and lock. Catalogue Cross Hair Number Objectives Eye-Pieces Nose-Piece Each 292 Mi V2 , V^ I in., Yi in. $72.00 M2 H: , Va I in., Yi in. Double $77.00 M3 I, Y, Va 2 in., \Yi in. I in., Yi in. $85.00 M4 1. y2. Va 2 in., I^ in. I in., Y2 in. Triple $92.00 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., Figure one-half actual size. Chamot Chemical Microscope— M New York, Boston, Chicago, U. S. -V, Frankfurt a/M., Germany. 293 Figure one-half actual size. Dissecting Microscope, W Figure one-half actual size. Demonstration Microscope, O Microscope, Demonstration, O. This microscope is intended for the demonstration of microscopic objects in the lecture room. It is so arranged that the object can be placed in position, the lens fo- cused upon it, and the whole passed from hand to hand and ex- amined without disturbing the focus of the objective. The tube carrying the eye-piece and objective, slides in the body tube and has spiral groove with pin by which the objective may be accurately focused. This improvement avoids the easy derange- ment of the adjustment and prevents the objective from coming ir, forcible contact with the slide. Catalogue Number Eye-Piece Objective Each O Oi 294 I in. ' $6.00 T in. 2/3 12.00 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 15708 I570S iS7o6 15710 Microscope, Dissecting, W. This microscope is constructed to se- cure great steadiness under manipulation, convenience in working, and durability. The base is heavily japanned, all other parts be- ing nickeled to prevent corrosion. The mirror frame holds a con- cave mirror and a white plane glass reflector. The stage is extra large, and the entire surface of the thick glass stage plate is avail- able for work, as the spring clips are attached to the metal support- ing frame. The stage plate is held in place by spring clips so as to be easily removable for cleaning, etc. Size of stage plate, 75 x 100 mm. The lens arm is jointed so that the lens may be moved over every part of the stage. The focusing arrangement is by accurate diag- onal rack and pinion of very long range, giving great working dis- tance between lens and stage. The Aplanatic triplet lenses should always be selected when cost is not prohibitive. Lenses of the foci listed are most generally used. Those of any of the regular foci can be substituted if preferred. Each W Microscope is furnished in neat wooden carrying case. Catalogue Lenses Each Number Doublet Coddington Aplanatic Triplet Wi I in. $ 9-75 W2 iVz in., 54 in. 10.50 W3 I m. 10.50 W4 iVz in., J4 in- 12.00 Ws T m. 12.50 W6 I in., yi in. 16.00 15703. Microscopes, Dissecting, W. Folding Wooden Hand Rests. Per Pair $2.00 Microscopes, Simple. See Magnifiers, Re.\ding Glasses. Microscopes, Other. See Catalogue of Microscopes and Accessories. Microtomes. See Catalogue of Microtomes. Microscopical Coverglasses. Our regular circular and square cover glasses are paekcd in half ounce packages and are furnished in 13, IS, 18, 22 or 25 mm. diameter. When ordering always give shape, thickness, size and quantity. If no designation is given, 18 mm.. No. 2 circles will be sent. New Vork, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 295 I Ml 15720 15732 15' 'No." Thickness Selected extra thin I 0.13-0.17 mm. 2 0.17-0.25 mm. 3 0.25-0.50 mm. 15740 15742 Per Ounce Circular Square 15704- 15705- 15706. 15708. 15710. 15711- 15712. 15714- 15716. 1 5718. 296 $2.50 1.25 1. 00 .80 Oblong coverglasses, any size and thickness, cut to order. on application. Microscopical Object Slides. White glass; edges ground round $2.00 1.05 -85 -70 Prices A Medium thickness; size, 25x75 mm. (No. 1290) B Extra thin; hize, 25x75 mm. (No. 1292) C Medium thickness; size, 38x75 mm. (No. 1302) D Medium thickness; size, 50x75 mm. (No. 1304) E Medium thickness; size, 25x75 mm.; concave center (No. 1306) Per Gross Per . Gross Per Gross Per Gross $1.00 $1.10 $2.00 $3.00 Per . Dozen $0.60 MILK TESTING APPARATUS Creamometers. To show the percentage of cream formed on milk. Consists of four graduated glass tubes supported on wooden stand. Complete. (See illustration, page 295.) Each $4.25 Creamometers. Single tubes. (See illustration, page 295.) Each . $0.30 Creamometer, Chevalier's. For measuring the percentage of cream . in milk. Without stop cock. (See page 295.) Each $0.70 Creamometer, Chevalier's. With glass stop cock. Each $1.50 Fat Determination Apparatus, Soxhlet's. Se^ Extraction ApparTCtus. Holt Milk Test Set. For testing human milk. With directions. Each $2.00 Lactobutyrometer, Caldwell's. For determining the amount of fat in milk. Consists of a graduated tube with rubber stopper, two volume pipettes, and one cylindar jar. Complete. Each $2.50 Lactobutyrometer, Marchand's. For fat determination. Complete with pipette. Each $1.25 Lactometer, Board of Health. Each $0.50 Lactometer, Board of Health. With thermometer. Each $1.50 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A.. I57SO We have changed our method of packing and marketing glass slides and cover glasses. In the futiire we shall pack them loo in a box instead of half ounce and half gross as previously. We give herewith the net selling prices adopted for the new quantities : 1290 Slides, j! .75 per [OO 1300 Slides, I1.25 per 100 1292 " .75 " 1302 (( x.so " 1294 " Discontinued i3°4 " 2.00 " 1296 " 2.00 n 1306 " .75 per 10 1298 " 1. 00 It 1307 (( 1.25 COVER GLASSES. 12 mm. $ .30 per 100 15 mm. .40 18 mm. - .60 22 mm. .80 _^ 25 mm. 1.20 Rectangular 22 x 40 mm. 2.00 " 24 X 50 mm. 2.50 PRICES ARE THE SAME FOR EACH OF THE FOLLOWING THICKNESSES OF GLASS : ; No. I No. 2 No. 3 0.13 to 0.17 mm. 0.17 to 0.25 mm. 0.25 to 0.50 mm. n.easu.e, acid fo. 5^ to^^iX^^ !f/S ™ e'ctioni";^^"'^' T' mg. uirections tor raanipulat- Number of bottles, ^ « o __ Each, Net «.. V-. ...„, c.,_ „. . _, ...J.Z.ZZZ^''^^^ 297 15762 IS764 15738. Babcock mlik test bottles. (See page 296.) Each $0.25 15740. Babcock cream test bottles. (See page 296.) Each $0.30 15742. Greiner's automatic pipette. (See page 296.) Each $1.25 15744. Paper for absorbing milk. Absolutely fat free; iu strips 65 x 560 mm. Per box of 50 strips. Each $1.60 15746. Milk Tester, Pioscope, Heeren's. For determining the richness of milk by comparison with standard colors. Consists o fa rubber plate having a cell in the center for the sample, and a glass plate with colored segments. (See page 297.) Each $0.75 15748. Mills. For grinding drugs, grains, seeds, etc. May be regulated to grind to various degrees of fineness. (See page 297.) Height, mm. 300 370 500 Diam. of wheels, mm. 200 200 260 Each, Net 3.75 4.75 8.00 15750. Mills, Assayer's. For grinding ores, etc. Diameter of wheels, 500 mm. Arranged to attach to table. (See page 297.) Each $5.00 15752. Mills, Assayer's. On iron stand. Each $7.00 15754. Mills, Assayer's. Extra plates for Nos. 15750 and 15752. Per set $2.00 Minim Glasses. See Graduates. Mirrors. Ground and polished; mounted in metal back with handle; 100 mm. diameter. Catalogue Number Curvature Each 15756. 15758. 15760. Mirrors, Special. Plane $3.50 Sphero-Concave 3.50 Sphero-Convex 3.50 Quotations furnished on receipt of specifications. 15762. 15764. Mixing Jars. See Cylinders. Moist Chambers. Of heavy, clear white glass. The cover fits loosely and has knob. Height (inside), mm. 70 80 Diameter of cover, mm. 200 240 Each 1.25 2.00 Moist Chambers. Without knob. Height (inside), mm. 70 80 Diameter of cover, mm. 200 240 Each 1. 00 15766. Moist Chamber, Geissler's. 15768. Moist Chamber, Recklinghausen's or Kleb's. 1-75 Each $0.75 With parallel surfaces. Each $1.25 298 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 15770 15772 I5770- Molecular Weight Determination Apparatus. Apparatus for Beck- mann's Freezing Method, New Form. Consists of battery jar with cover and stirrer, four air jackets, four freezing tubes, three filling pipettes, one thermometer, — 20° to +40°C. in degrees, one stan- dard thermometer of Jena Normal glass divided in 1/100°, etc. Each $31.50 15772. Molecular Weight Determination Apparatus. Apparatus for Beck- mann's Boiling Point Method, Old Form. Consists of a boiling flask with three tubulatures and sealed-in platinum wire, asbestos jacket, paper, granite stones, glass beads, two filling pipettes, Pas- tille press, one metal condenser, glass condenser, gas regulating stop cock, and one standard thermometer of Jena Normal glass, graduated in i/ioo°C. Each $42.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 299 15774 15774- Molecular Weight Determination Apparatus. Apparatus for Beck- mann's Boiling Point Method, Latest Form. Consists of asbestos heating box and support, steam jacket of glass, steam jacket ot porcelain, boiling cylinder with sealed-in platinum wire, two spiral condensers, two Liebig's condensers, granite stones, glass beads, two filling pipettes, clay plate, asbestos paper, and one standard thermometer of Jena Normal glass, graduated in i/ioo°C. Each $26.75 15776. Mortars, Agate. Superior quality; with pestle. Diameter, mm. 30 3S 4° 45 SO 55 60 Each i.io 1.20 1.30 1.35 1.60 1.90 2.25 Diameter, mm. 65 70 75 80 90 100 120 Each 2.65 3.00 3.7s 4.50 6.40 8.25 13.00 Any of the above agate mortars will be furnished with wooden base at extra cost. 15778. Mortar, Diamond, Leed's. Of hardest steel. 15780. Mortars, Diamond, Plattner's. Of hardest steel. Each $2.00 Diameter (inside), mm. IS Each 3.60 5-7° 300 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A, IS778 IS780 1 5794 15786 15776 15790, 15792 15782. Mortars, Glass. Of clear white glass; very heavy and strong. Capacity, cc. 30 60 125 250 500 1000 Diameter, mm. 60 70 100 no 130 150 Each .15 .18 .25 .30 .50 .75 15784. Mortars, Iron. With pestle of iron. Capacity, cc. 250 500 1000 2000 4000 Diameter, mm. 100 125 150 175 225 15785- 15786. 15788. 15790- Each .40 .80 1.20 1.40 2.70 Mortars, Iron, Chilled. Equal to steel; especially made for powder- ing hard ores, etc., with extra large pestles. Capacity, cc. 2000 4000 8000 12000 Each 2.00 3.00 4.80 6.50 Mortars, Porcelain. Deep form; with lip and pestle. Glazed out- side, rough inside. Diameter, mm. 65 80 no 130 150 175 200 260 Each Mortars, Porcelain. Diameter, mm. .18 .25 .45 .60 .go Glazed inside and outside. 65 80 no 130 150 i.io 1.35 2.40 I7S 260 Each .35 .40 .70 .80 i.io 1.40 1.60 2.75 Mortars, Porcelain. Shallow form; with lip and pestle. Glazed out- side, rough inside. Diameter, mm. 65 80 no 130 150 175 200 260 Each .18 .25 .45 .60 •90 1.3s 2.40 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 301 1 5797 15795 CDMMUTAtOB. NAME riAIEHITH SCREWS. BRUSHES, SCREWS FDR BASt. BRUSH HOLDERS. 15796 15792. Mortars, Porcelain. Shallow form. Glazed inside and outside. Diameter, mm. 65 80 no 130 150 175 200 260 15795- 15796. Each •35 .40 -7° -oo i-io 1-40 I -60 2.75 15794. Mortars, Wedgewood. Guaranteed acid proof; pestle with wooden handle. (See illustration, page 301.) Diameter, mm. 75 90 100 125 150 175 Each Diameter, mm. •32 200 •45 240 •50 260 ■65 300 .80 350 1-15 Each 1.40 2.25 2.75 3.30 4.40 Motor, Electric, Porter. Motor of simple form for demonstration purposes. Well made and finished; especially desirable for school work. Each $1.50 Motor, Electric, Porter. Same as No. 15795 but dissected for student use. Directions accompany each set of parts, enabling anyone to produce the complete motor. Each $1.25 302 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 15798 15797- Motor, Electric, Porter No. 7. Drum armature type; adapted for a variety of uses which will be appreciated by anyone desiring this type of machine. A, Wound for use with battery. Each $7.00 B, Wound for use with no- volt circuit in series with i6-cp. lamp. Each $8.00 15798- Motors, Electric, Rochester. The motors listed below are the well- known Rochester Motors, They are of the iron-clad protected type with ventilation. The bearings are of phosphor bronze, self- aligning and provided with ring oilers; another peculiar feature of the bearings is that there are no screws or babbitt metal used in connection with the adjusting of the boxes, doing away with any chances for the screws to loosen or the babbitt to soften. The com- mutator bars are of the purest lake copper, insulated with prepared mica. The windings are extra heavily insulated with tape, mica and fuller board, and all materials are the best known for the pur- pose in hand. Prices include automatic release starter, pulley, brushes and sub- base for 3-horse power motor and larger. The J4, i, and 2-horse power machines can be wound for 500 volts at an increase in price of $5.00 each. Speed regulating devices furnished at slightly in- creased prices. Horse Power ^ V2 I Revol. per min. (approx.) 1600 1400 1300 Volts SO to 250 50 to 250 50 to 250 Net Weight, kilos. 35 55 70 Gross Weight, kilos 55 8S 100 Case, cm. 45x30x30 45x38x38 58x38x40 Each, Net 45-00 60.00 75.00 Horse Power 2 3 4 Revol. per min. (approx.) 1200 1000 1400 Volts Net Weight, kilos Gross Weight, kilos Case, cm. 1 10 to 250 no to 500 230 and 500 only 125 220 220 160 275 275 60x60x60 75x70x60 75x70x60 Each, Net 135-00 145-00 New Ycrk, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 303 15802, 15803 15804 IS799- Motor, Rabe's. For water, vapor, or expanded air. This motor can be attached to an ordinary apparatus stand and used for either stirring or shaking. Complete. Each $6.75 15800. Motor, Rabe's. Turbine only. Each $6.00 15801. Motor, Rabe's. Turbine holder only. Each $0.75 15802. Motor, Water. A high grade and high speed motor for use with or- dinary water service. Furnished with fittings for hose connec- tions and grooved cone-pulley giving two speeds. Very desirable for light work. In ordering state water pressure. Horse power i/io to i/4S- Jet 2 to 3 mm. Each $20.00 15803. Motor, Water. This is a very desirable motor for laboratory work where good water pressure is to be had. It is the only water motor built that can be taken apart and put together by an inexperienced person. It is built on scientific and mechanical lines and gives maximum power with minimum pressure. Will never freeze; noise- less in operation; speed steady and invariable. Diameter, mm. 200 300 400 500 Horse power according to water pressure }^ to iJ4 J4toi^ 5/^t0 3 i to 4 Size of jet, mm. 3 to 5 5 to 6 5*07 5 to 8 Each 24.00 32.00 40.00 80.00 304 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 15804. 15805 Motors, Hot Air. Of the famous Heinrici pattern. These small motors will be found useful in any place as they are independent of conditions such as are indispensable with steam engines, gas motors, etc., and are also devoid of all danger under any and all circumstances. These motors operate upon the simple principle of expansion of heated air and the contraction of cooled air. The three smaller sizes are carried in stock, the larger sizes imported to order. (See illustration, page 304.) Horse power 1/40 1/20 Weight, kilos 17 25 Diam. of fly-wheel, cm. 18 25 Revolution per minute without load 500-600 500-600 15805. I/I5 i/io 1/8 i/.^ 43 75 175 250 30 38 50 57 500 400 340 320 Price vnth gas burner F. O. B. Rochester 45.00 75.00 112.50 150.00 225.00 300.00 Motors, Hot Air. These motors are operated by the expansive force of heated air. Gas or alcohol may be used for fuel, and once started the motors will run continuously with little or no attention until the flame is extinguished. They are absolutely safe, inexpen- sive, and adaptable to any purpose where only light power is re- quired. The best material and workmanship enter into their con- struction, and they are attractively finished in enamel, nickel, and bronze. Style A B C Total length, mm. 4S0 450 560 Diam. of fly-wheel, mm. 150 ISO 200 Weight, boxed, kilos 5/2 7 14 Each, Net 5.00 7.50 12.75 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 305 15832 A B 15826 15824 15830 15828 15806. Mould, Ingot. Of cast iron. Size, 175 x 38 x 25 mm. Each $1.00 15808. Mould, Ingot or Bullion. Of cast iron; with slide to cast any length of bar desired. Size, 200 x 38 x 38 mm. (See page 305.) Each $1.50 15810. Mould, Pouring. Of cast iron; with two conical cavities, 55 mm. diam., drilled smooth; wooden handle. (See page 305.) Each $1.00 15812. Mould, Pouring. Of cast iron; with three conical cavities, 50 mm. diam.; wooden handle. (See page 305.) Each $0.60 15814. Mould, Pouring. Of cast iron; with hemispherical cavities, 40 mm. diam. Number of cavities 6 9 12 Each .60 .70 .80 15816. Muffles, Battersea. Regular form. Length, mm. 175 190 200 Width, mm. 87 no 120 Height, mm. 60 70 75 215 225 250 125 13s ISO 80 90 100 706 Each, Net .35 .45 .55 .65 .70 .80 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 15818. Muffles, Battersea. Colorado form. Length, mm. 350 375 375 400 40O 450 Width, mm. 200 225 275 275 250 27s Height, mm. 120 142 165 150 175 175 Each, Net i.oo 1.30 1.95 2.00 2.00 2.25 15820. Muffles, Battersea. Hoskins' form; with opening in top. Length, mm. 200 250 Width, mm. 120 150 Height, mm. 75 100 Each, Net .55 .80 15824. Muffle Scraper. For cleaning muffles. Length 90 cm. Straight blade. Each $0.40 15826. Muffle Scraper. Bent blade. Each $0.40 15828. Needles, Inoculating. Heavy platinum needle set in glass handle. Length, mm. 40 80 Each .50 .75 15830. Needles, Inoculating. Heavy platinum needle mounted in aluminum handle. A glass tube closed at one end forms a holder into which the needle may be reversed when the instrument is not in use. Form B is useful for transferring cultures of bacteria. A B Style Straight Twisted Loop Each .75 1.00 Nessler Tubes. See Colorimetric Determination App.\ratus Nickel Goods. See Crucibles, Dishes, Filter Cones, Spatulas, Tongs, etc. Nitrogen Bulbs. See Gas Apparatus. Nitrometers. See Gas Apparatus. 15832. Nivellating Apparatus. For leveling culture media during solidifica- tion. The triangular base has leveling screws and there is a double glass receiver for ice, a ground glass plate for supporting plates, a bell glass cover, and a circular level. Each $8.50 15834. Note Book Covers. These covers open on the side and have a flex- ible margin near the back, which permits full width of paper held by them to be used. Either side of the leaves may be written on with equal facility. Very handy for the laboratory. Each $0.45 15836. Note Book Paper. For use in above covers; unruled, and of a good quality for writing with ink. It is furnished punched to fit the covers. Per package of one pound with fasteners. Each $0.40 Postage per package. $0.20 Numbers, Steel. See Figures. Object Slides. See Microscopical Slides. OIL TESTING APPARATUS 15838. Oil Tester, Abel's. The form adopted by the German government as standard; with 2 Standard Ivory Thermometers. Complete in case. (See illustration, page 308.) Each $80.00 15840. Fire Tester, Elliot's. As adopted by the New York State Board of Health. To ascertain at what temperature oil will flash or explode. With standard thermometer. (See illustration, page 308.) Each $13.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. oq*^ 15840 15843 15842. Fire Tester, Foster's. To ascertain at what temperature oil will flash or explode. With standard thermometer. Each $i5.cx) 15844. OpenFire Tester. To ascertain at what temperature oil will flash or explode. With standard thermometer. Each $7.50 15848. Open Fire Tester, Cleveland. For high grade or lubricating oils. The most substantial tester on the market, being made of heavy brass castings. Complete with standard solid glass thermometer, 80° to about 640°, spirit lamp, and Bunsen burner for gas. Each $16.00 15850. Pyrometer, Tagliabue's Coal Oil. Small size; to ascertain at what temperature oil will flash or explode. With standard thermometer ranging from about 50° to 170°, or 80° to 250° F. Each $21.60 15852. Pyrometer, Tagliabue's Coal Oil. ..Large size; same as No. 15850. Each $27.00 15854. Pyrometer, Tagliabue's Coal Oil. Large size; same as No. 15852; with Bunsen burner, and thermometer ranging from about 80° to 400°, or 200° to 600° F. (See illustration, page 309.) Each $32.40 308 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., t!^^ 15854 15868 15856. Melting Point Tester, Standard. For fats and wax. This instru- ment is a great improvement over old, tedious and unreliable in- struments and methods. The results obtained are not affected by currents of air or the tmperature of the room in which the tests are made, and the tests are made in one-twentieth of the time required for other methods. Only a teaspoonful of the sample is necessary for a test and one test after another can be made in rapid succes- sion, it being only necessary to empty the funnel and add the new sample. Complete with tw-o standard thermometers. Each $30.00 15858. Viscosimeter, Boverton Redwood's. Imported to order. The recog- nized standard instrument for the viscosity of oil. Complete, with thermometers. Duty paid, Each, Net $45.00 15860. Viscosimeter, Boverton Redwood's. Complete; fitted in portable mahogany case. Duty paid. Each, Net $51.00 15862. Extra thermometers for high temperature, 340° and 300° F. Per pair, duty paid. Net $5.00 15864. Viscosity Pipette, Dudley's. As adopted by the Pennsylvania Rail- road. Delivers 100 cc. of distilled water in 35 seconds at a temper- ature of 100° F. Each $2.00 15866. Viscosimeter, Improved Form. Specially devised to meet all de- mands as a measure of viscosity, without the many objections that occur against other forms. It is intended to show the viscosity of any oil by noticing the number of seconds required for 50 cc. to run through the open faucet. Each instrument is thoroughly tested and standardized. Each $60.00 15868. Viscosimeter, Scott's. For determining the viscosity of oils, etc., by noting the number of seconds required for 50 cc. to run through. This is a reliable instrument and compares very favorably witli New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 309 IS904. 15906 DRAWING FENGJJt., 15886 15870. See Milk Testing Apparatus. 15872. 15874- 15876. 15878. 15880. 15882. 15884. 15886. 15888. 15890. 15892. 15894. 15896. 15898. 15900. 15902. Per quire $0.30 Per quire $0.30 Per quire $0.30 Per quire $0.30 $0.35 those of much higher price. Complete, with standard thermome- ter and 50 cc. graduate. Each $10.00 Oil Testing Apparatus. Stop Watch. For use with above instru- ments. Each $10.00 Pails, Agateware. See Buckets. Palladium Tubes. See Gas Apparatus. Pans, Scale. See Balance Pans. Paper, Adam's, for Absorbing Milk. Paper, Bibulous. See Filter Paper. Paper, Filter. See Filter Paper. Paper, Glazed. White. Paper, Glazed. Black. Paper, Glazed. Blue. Paper, Glazed. Yellow. Paper, Lens. See Lens Paper. Paper, Litmus. See Test Paper. Paper, Parchment. For dialysers, etc. Per five hundred grams Paper, Tracing. Very thin, transparent, and tough. Size 50 x 68 cm. Per quire $1.25 Paraffin Baths. See Water Baths. Parting Flasks. See Flasks, Assay. Pasteur Flasks. See Flasks, Culture. Pencils, Drawing. A. W. Faber's best quality, 3H. Each $0.12 Pencils, Drawing. A. W. Faber's best quality 6H. Each $0.12 Pencils, Litmus, Tyree's. Red and blue litmus pencils, in metal case. Each $0.25 For writing on glass, china, metal, etc.; white. Each $0.13 For writing on glass, china, metal, etc.; blue. Each $0.13 For writing on glass, china, metal, etc.; red. Each $0.13 For writing on glass, china, metal, etc.; yellow. , Each $0.13 Pens, Crow-quill. One dozen in a box. Per box $0.50 Pens, Lithographic Crow-quill, Gillott's. Per dozen, with holder $0.60 Pen Holder. For Crow-quill pens. Each $0.07 Pencils, Wax. Pencils, Wax. Pencils, Wax. Pencils, Wax. 310 Bausch dr Lomb Optical Co., Rochester, N. Y., U. S. A., 15908, iSQio 15920 T 15916, 15918 15914 15912 < J 15922 15924 15904. Pens, Fountain. Genuine Waterman Ideal. Style of pen Fine Medium Small barrel. Coarse Stub 15906. 15908. 15910. 15912- 15914- 15916, 15918. Each, Net 2.50 2.50 2.50 2.50 Pens, Fountain. Genuine Waterman Ideal. Large barrel. Style of pen Fine Medium Coarse Stub Each, Net 2.50 2.50 2.50 2.50 Percolator, Agateware. Agate nickel steel. Capacity, 500 cc; diam- eter, 100 mm. Each $0.90 Percolator, Agateware. Flint enameled; acid proof. Each $1.00 Percolators, Copper or Tin. Any size made to order. Percolators. Heavy flint glass; conical. Capacity, liters % 16 i 2 4 8 12 Each .25 .30 .35 .50 .75 1.35 2.25 Percolators. Heavy flint glass; Oldberg's. Capacity, liters % 'A 1248 Each .25 .30 .40 Percolator Jars. Graduated in ounces. Capacity, gal. J4 'A •55 •85 1-35 Each i.io 1.60 2.40 3.60 Percolator Jars. Graduated in cubic centimeters. Capacity, liters 1248 Each i.io 1.65 2.50 3-75 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 311 1 5925 15928 15934 15936 15938 15940 -15942 15920. 15922. 15924- 15926. 15928. 15930. 15932. 15933- 15934- Pill Tiles, Porcelain. Graduated; square. (See page 311.) Size, mm. 150 200 250 300 Each .50 .75 1.20 2.00 Pinch Cocks. See Clamps. Pins, Insect, Klaeger's. White; with round heads; perfect points; very stifif. Sizes, 00 to 6. Per hundred $0.15; per 1,000 $1.20 Pins, Insect, Klaeger's. Black, enameled; with round, yellow heads; perfect points; very stiflf. (See illustration, page 311.) Sizes 00 and o i to 6 Per hundred of a size .20 .18 Per thousand of a size 1.75 1.50 Pinning Forceps. Made of steel, nickel plated. The blad<'s are bent at the proper angle for convenient use in crovvded collections. Length, 135 mm. Each $1.50 Pinning Forceps. With lever iiandles; nickel plated; extra strong and accurately made. Length, 150 mm. Each $2.50 Pipe, Block Tin. Diameter, mm. 5 6 8 9 12 $0.20 Per 450 grams (i lb.) .80 .80 .80 ,80 .80 Pipe, Lead. Diameter, mm. S 6 8 9 12 Per 450 grams (i lb.) .15 .15 .15 .15 .15 Pipes. Common clay. Per ten Pipettes. With rubber bulb; capacity, 2 cc; straight. Per ten $0.30 312 Bausch & Lonib Optical Co., Rochester, N. Y., U. S. A., ^i 15944 15946 15950 15956 15958 15960 15936. Pipettes. Capacity, 2 cc; curved. Per ten $0.30 15938. Pipette. With large mouth and extra large rubber bulb; straight. Per ten $0.75 15940. Pipettes. Without bulb; straight. Length, mm. 200 300 Per ten .45 .60 15942. Pipettes With 20-cc. rubber bulb; straight. Length, mm. 200 300 Per ten 1.50 1.75 15944. Pipettes, Acid. Designed by Prof. C. G. Hopkins for the determina- tion of the acidity of soils. By this method it is possible to deter- mine quantitatively the amount of lime which a soil requires to neutralize the soil acidity. Each $6.00 15946. Pipettes, Automatic. With three-way stop cock. Capacity, cc. 10 25 50 100 Each 3.60 3.75 4.00 4.50 15948. Pipettes, Bleier's. With four bulbs holding 10 cc. each, and tube holding 10 cc, graduated in 1/5 cc. (See page 314.) Each $2.50 15950. Pipette, Bulb. Capacity about 45 cc. Each $0.20 PIPETTES, GRADUATED In the manufacture of pipettes even more careful details are observed than for instruments of coarser graduations. Being under our own supervision, we can trace the work through the various stages of production and, as each instrument is carefully tested, give the as- surance of unexcelled quality. The following pipettes are adjusted by measurement with water at 15° C. and are well adapted for general laboratory work. 15952. Pipettes, Mohr's. Capacity, cc. i i i 2 2 2 5 Graduated, cc. i-io 1-50 i-ioo i-io 1-20 1-50 i-io ' Each •25 •30 •32 •30 •32 .40 .40 Capacity, cc. 5 10 10 25 50 75 100 Graduated, cc. 1-20 I-IO 1-20 I-IO I-IO 1-5 i-S Each ■45 •45 .55 .65 "i.oo 1.4s 1.75 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 313 15948 / 11 15966 15962 15964 15954- Pipettes, Mohr's. With glass stop cock. Capacity, cc. 10 25 Graduated, cc. i-io i-io 15952 50 I-IO 15968 100 1-5 Each 1. 00 1.50 Pipette, Viscosity. See No. 15864. 15956. Pipettes, Volumetric. Capacity, cc. i 2 3 4 5 10 1.8s 2.40 1 5954 IS 20 25 so 7S 100 200 Each .08 .09 .10 .II .12 .14 .16 .20 .25 .32 .40 .45 .60 15958. Pipettes, Volumetric. Graduated in minims; with rubber bulb. Capacity, minims 30 60 Each .30 .40 15960. Pipettes, Volumetric Safety. With stop cock, and reservoir to receive the overflow. Capacity, cc. 2 5 10 25 so 100 Each 314 1.25 1.35 1.45 1.55 1.65 2.00 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., 1597° 16002 16014 Pipettes, Graduated, for Laboratory Work of Precision. These pipettes are graduated by weight on delicate balance and are standardized to meet the requirements of the German Imperial Commission. A certificate of accuracy is supplied with each instrument. 15962. Pipettes, Mohr's. Standardized. (See illustration, page 314.) Capacity, cc. i i 2 2 5 Graduated, cc. i/ioo i/io 1/50 i/io i/ro Each Capacity, cc. Graduated, cc. ■65 ■so .80 .60 10 25 so 100 /lO i/io i/io i/S .90 Each .90 1 .30 15964. Pipettes, Volumetric. Standardized. Capacity, cc. 125 10 2.00 3.50 (See illustration, page 314.) 20 25 50 100 150 2 Each .16 .18 .25 .30 .40 .50 .65 .90 i.oo 1.20 We can supply these pipettes (on import orders only, and at higher cost), tested by the German Imperial Commission, whose indorsement of accuracy is stamped upon each instrument. 15966. Pipette Box. Of sheet iron; for sterilizing pipettes. Size, 100 x 100x300 m.m. (See illustration, page 314.) 15968. Pipette Rest. Of porcelain; for pipettes, stirrers, etc. mm. (See illustration, page 314.) Pipettes for Gas Analysis. See Gas Pipettes. pipette Stands. See Supports. Pitchers, Acid. See Acid Pitchers. 15970. Pitchers, Agateware. Agate nickel steel; seamless. Capacity (approx.), liters 15^2 2 3 Each $1.50 Size, 75x65 Each 15972. Pitchers, Agateware prox.), 2 liters. Plate and Rubber. See Crusher, .90 1. 10 1.35 Flint enameled; acid proof. 1.60 Capacity (ap- Each $1.70 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 315 Plates, Glass. Circular. Plain or ground on one side; edges not ground. Diameter, mm. 50 75 100 125 150 175 200 225 250 300 15974- Plain. Each .04 .05 .07 .08 .12 .16 .20 .25 .30 .40 15976. Ground on one side. Each .05 .06 .08 .10 .15 .20 .25 .30 .35 .50 15982. Plates, Glass. Circular; with ground edges, and piece cut out of edge to admit stirrer. Diameter, mm. 50 75 100 125 150 Each .25 .30 .35 .40 .45 15984. Plates, Glass. Circular; with ground edges, and hole in center to admit stirrer. Diameter, mm. 50 75 100 125 150 Each .25 .30 .35 .40 .45 Plates, Glass. Square. Plain or ground on one side; edges not ground. Size, mm. 75 100 125 150 175 200 225 250 300 15986. Plain. Each .03 .04 .06 .08 .12 .16 .20 .25 .30 15987. Ground on one side. Each .04 .05 .07 .10 .15 .20 .25 .30 .35 Plates, Glass. Heavy Plate. Square; ground on one side. Size, mm. 75 100 125 150 175 200 225 250 300 15990. Edges rough. 15991. Edges ground. 15992. 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 15994- Plates, Blue Glass. Edges ground. Size, mm. 50 x 50 50 x 75 75 x 75 50 x lOO 75 x 100 100 x 100 Each .08 .10 .10 .10 .12 .15 15996. Plates, Ruby Glass. Edges not ground. Size, mm. 50x50 50x75 75x75 50x100 75x100 100 x 100 Each .04 .05 .06 .06 .08 .10 15998. Plates, Ruby Glass. Edges ground. Size, mm. 50 x 50 50 x 75 75 x 75 50 x 100 75 x lOO 100 x 100 Each .08 .10 .10 .10 .12 .15 Plates, Hot. See Burners, Hot Plate. 16000. Plates, Porcelain. Perforated; for use in funnels. (See page 315.) Diameter, mm. 25 38 50 75 100 125 150 175 Each .20 .20 .30 .50 .75 1. 00 1.25 1.50 o j5 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., Each -15 .20 ■25 -30 ■35 .40 .50 .80 1. 00 Each .20 -25 -30 -35 •45 •55 .70 1. 00 1.25 i« w I60I8 16020 16002. Plate, Porcelain. For color reactions; with twelve cavities; may be used as a receptacle for small weights. Size, iisx'po mm. Each $0.65 16004. Plate, Porcelain. Suitable for the base of a support stand; with hole in center, and supported on three legs. Diameter, 285 mm. Each $3.50 16006. Plates, Porous. Circular; for drying crystals and precipitates. Diam- eter, 250 mm. Each $0.15 16008. Plates, Porous. Square; for drying crystals and precipitates. Size, mm. 150 200 .300 400 Each .35 .55 .75 1.25 16010. Plates, Streak. Of porcelain; for mineralogists. Each $0.25 PLATINUM WARE The articles listed below are made of pure platinum, hammered into shape and not spun. All of our platinum ware is sold by ac- tual weight at current price of platinum, and not by the piece or according to the approximate weights given, which are, however, sufficiently correct to estimate the cost. Quotations furnished on request. 16012. Platinum Blowpipe Tips. Seamless. (See page 315.) 1 6014. Platinum Combustion Boats. All sizes, shapes, and weights, from 3 to 10 cc .capacity and 4 to 8 grams weight. (See page 315.) 16016. Platinum Combustion Tubes. Seamless. Length, mm. 300 300 Diameter, mm. 18 20 Weight (approx), grams 130 160 16018. Platinum Crucibles. Supplied with covers, unless otherwise ordered. Weight, with covers, approximately as many grams as capacity in cc. Capacity, cc. 8 10 12 15 20 25 30 35 40 45 50 55 Co 16020. Platinum Crucible. Gooch Form. For the determination of com- bined water and carbonaceous matter in iron analysis. See " Blair's Analysis," 3d edition, page 260. Prices quoted on request. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 317 l6022 16024 16022. 16024. 16026. 16028. Platinum Crucibles. Gooch Form. Perforated; furnished with covers, unless otherwise ordered. Weights below include covers and caps. Capacity, cc. 20 25 30 Weight (approx.), grams 22 29 34 Platinum Crucible. See Combustion Apparatus, Shimer's. Platinum Dishes, Evaporating. With lip. Capacity, cc. 20 30 45 80 125 200 270 370 400 Weight (approx.), grams 8 14 22 32 48 65 90 125 150 Platinum Evaporating Dis.hes, of other sizes and shapes, lighter or heavier, or with wire rim, made to order. 16030. 16032. 16034. 16036. 16038. 16040. Platinum Dishes. For incinerations. (See Length, mm. 38 Capacity, cc. 15 Weight (approx.), grams 10 Platinum Dishes. For iron analysis with lip and wire rim fused into the dish stirring rod.' Diameter, mm. 90 100 Depth, mm. ' 50 55 Weight (approx.), grams 80 100 lustration, page 319.) SO 20 IS Flat bottom; straight sides; Supplied with platinum no S8 1 25 (See page 319.) Platinum Dish. For iron, steel, and water analysis. Platinum Dish. For milk analysis. (See page 319.) Platinum Dish. For sugar analysis. Platinum Dishes. For sugar analysis. With or without handle. Furnished with handle unless ordered otherwise. Diameter, 50 mm.; weight, from 10 to 15 grams. (See page 319.) Platinum Filter C^nes. Seamless; perforated; angle 60°. (See page 319-) Diameter, mm. 18 25 Platinum Filter Cones. Flexible f orated; adjustable to any angle Diameter, folded, mm. 18 Cones, Other Kinds. See Filter Cones. Prices quoted on request. 30 40 50 full or three-quarter circle; per- (See page 319.) 25 30 40 50 318 Bausch & Lomb Optical Co., Rochester, N. Y., TJ. S. A.> 16036 16038 16042. i6o44- 16046. 16048. 16050. 16051. 16053. 16054. 16056. S2 45 O.IO 0.22 0.084 0.233 16026 Platinum Filtering Apparatus. For holding perforated boats in iron analysis. See "Blair's Analysis,'' 3d edition, page 151. Weight of boats, approximately, 15 grams; holders, approximately, 25 grams. (See page 320.) Platinum Foil! Any size- or thickness. Stock thicknesses, .01, .02, .03, .04, .05, and .06 mm. Platinum Gauze. Mesh Wire, mm. Weight, grams per sq. cm. Platinum Muffle, Scheibler's. For sugar and milk analysis, enamel- ing, etc. Length, no mm.; width, 50 mm.; height, 38 mm.; weight (approx.), 50 grams. (See page 320.) Platinum Spatulas. Blade form; length 75 to 100 mm.; weight 4 to 8 grams. Platinum Sponges. Each $0.40 Platinum Spoons. For blowpipe analysis; with or without cover. Bowls 10 to 18 mm. diameter, and 5 to 10 mm. deep. (See page 320.) Platinum Tipped Crucible Tongs. German silver, with platinum shoes. Length about 220 mm. (See page 320.) Platinum Tipped Crucible Tongs. With solid platinum tips. Prices quoted on request. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 319 i6o62 16058. Platinum Tipped Crucible Tongs. Pure nickel, with platinum shoes. Length, about 220 mm. 16060. Platinum Tipped Crucible Tongs. With solid platinum tips. 16062. Platinum Tipped Crucible Tongs, Blair's. Polished steel, with long heavy platinum tips, as described in "Blair's Analysis," 3rd edition, page 35. 16064. Platinum Tipped Forceps. Nickel plated, with heavy platinum shoes. Length, 170 mm. 16066. Platinum Tipped Forceps. Nickel plated, with heavy platinum shoes. Length, 125 mm. 16068. Platinum Tipped Forceps. With heavy solid platinum tips. 16070. Platinum Tipped Forceps. Nickel plated, with solid platinum tips. Length, 135 mm. 16072. Platinum Tipped Forceps. Nickel plated; with solid platinum tips. Length, 90 mm. Prices quoted on request. -20 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A, i6o72 16068 16070 16074. 16075. 16076. 16078. 16080. 16082. 16084. 16074 Platinum Triangles. Platinum Triangles. Platinum Triangles. 16076, 16078 16075 Solid ends; sizes to fit crucibles. Twisted ends; sizes to fit crucibles. To be used with holder as illustrated. An eco- nomical form. Sizes to fit crucibles. Holder for above triangles; nickel platei Each $1.50 Platinum Tubes for Combustion. See Platinum Combustion Tubfs. Platinum Wire. Any size furnished. Stock sizes, 12, 14, 16, 18, 20, 21, 22, 23, 24, 26, 2T, 28, 30, 36. B. & S. gauge. Platinum Wire Holder. To hold any of the above sizes of wire. Each $0.50 Steel; flat nose. (See illustration, page 322.) Length, mm. 100 125 150 200 Pliers. 16086. Pliers. 16088. Pliers. Each .45 .50 .70 1.25 Steel; flat nose; side cutting. (See illustration, page 322.) Length, ram. 125 150 200 Each Steel; end cutting. Length, mm. 100 .80 1. 00 1.85 (See illustration, page 322.) 125 150 200 Each .80 .80 1. 00 1.85 New York, Boston, Chicago, U. S. A,, Frankfurt a/M., Germany. 321 i6og6 16084 16086 16088 i6ogo. Pliers. Steel; side cutting. Length, mm. 100 I2S i6ogo ISO 16094 Each .80 .80 1. 00 1.85 16092. Pliers, Button. Straight; for holding buttons while brushing. Length, 125 mm. Each $0.50 16094. Pliers, Button. Tunied-down nose; for holding buttons while brush- ing. Length, 125 mm. Each $0.60 16096. Pliers. Gas tongs, 200 mm. long. Each $0.85 Pneumatic Troughs. See Troughs. POLARISCOPES 16098. Polariscope, Patent Standard. A half shade apparatus with double quartz wedge compensators and of the most improved construction throughout. Fitted with Lippich's polarizer and illuminating sys- tem, telescope with converging oculars, and patented reading device for the scale. The advantages of this instrument are: simplicity of construction, which is very important where instruments are used in laboratories which are far removed from an instrument maker; it is extremely accurate, as the wedges are not mounted in brass and consequently not exposed to pressure; the scale may be readily tested; all parts, including the Nicol prism are thoroughly protected against the influence of temperature and humidity; the form of standard affords a solid foundation, which will be found handy in use; the adjustment of the instrument is such as to allow of quick work and yet is not fatiguing to the eyes after continued use. This polariscope is equally reliable with petroleum, acetylene gas, coal gas, or electric lamps, thus doing away with the incon- venient sodium lamp. Imported to order. For tubes 200 mm, long. Complete with tubes. Each, Net $231.50 322 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., Each, Net $251.50 Each, Net $279.00 1 61 06, 1 61 08 16100. For tubes 400 mm. long. Complete with tubes. 16102. For tubes 600 mm. long. Complete with tubes. 16104. Polariscope Control Tubes. For use with Patent Standard Polar- iscope. These tubes enable the operator to have the polariscope always under control without wasting time. A constant watch can be exercised over the entire length of the scale and a surety of reading may be obtained which would otherwise be possible only by the constant use of many normal solutions. Imported to order. Length, mm. 200 400 Each, Net 26.00 28.00 16106. Polariscope, Laurent's. A half shade apparatus with Laurent's polar- izer, consisting of a single Nicol and a rock crystal plate, with ob- servation tubes of 100, 200, and 220 mm. long and with sodium gas lamp. This apparatus is particularly adapted for exact chemical analysis, reading to I minute. Imported to order. Each, Net $g7.5o New York, Boston, Chicago, U. S. -V., Frankfurt a/M., Germany. 323 i6ii2, 16114 16108. Polariscope, Laurent's. Same as above but with an extra scale for the direct reading of the percent, of beet sugar. Imported to order. Each, Net $104.50 Polariscopes, Schmidt and Haensch. Imported to order. Prices and information given on application, 16110. Polariscope, Standard Medical. Latest form. A half shade appa- ratus for urine analysis, with quartz wedge compensator and linear scale. The sugar and albumen in urine can be read off directly down to i/io of 1%. The instrument is provided with one tube 324 Bausch & Loinb Optical Co., Rochester, N. Y., L". S. i6i30 16116 16122 100 mm. long and one 200 mm. long. Alay be used with either gas or petroleum light. Entire apparatus fitted in mahogany case. Price including lamp. Each, Net $51.00 Polariscope, Mitscherlich's Latest Model. A half shade apparatus with graduated scale and vernier reading to i/io degree. Two tubes, one 94.3 mm. long and one 188.6 mm. long. Arranged for the direct reading of the percentage of grape sugar in urine. An excellent instrument for physicians and general laboratory work. 16112. Complete with gas sodium lamp. Each, Net $46.00 16114. Complete with Barthel's alcohol sodium lamp. Each, Net $48.00 16116. Polariscope Lamp, Electric. A 32 candle power lamp with silvered back. Complete wi.th wire and switch. Each, Net $10.00 16118. Polariscope Lamp, Gas. With incandescent burner, two extra glass cylinders, two extra mantles, and highly polished metal cylinder which acts as a reflector to the flame. Each, Net $8.25 16120. Polariscope Lamp, Gas. With triple burner, metal cylinder reflector, and condensing lens. Each, Net $10.75 16122. Polariscope Lamp, Kerosene, Kink's. With double burner, two extra glass cylinders, and highly polished metal cylinder which serves as reflector to the flame. Each, Net $7.75 New York, Boston, Chicago, U. S. .\., Frankfurt a/M., Germany. 325 1 6140 I6I42 I6I44 1 6146 1 61 48 16150 16152 16124. Polariscope Tubes. Of brass, nickel plated. Length, mm. 25 so 100 200 400 600 1 61 26. Each, Net Polariscope Tubes. Length, mm. 3.00 3.00 3.90 3.00 Of glass; mounted. 25 50 100 200 3-50 400 4.50 600 I6I28. Each, Net Polariscope Tubes. Length, mm. 2.75 2.7s 2.75 2.75 Of glass; unmounted. 25 50 100 200 3-10 400 4.00 600 Each, Net .50 .50 .50 .50 .70 1.05 16130. Polariscope Tubes. Of glass; with filling^tube as shown in illustra- tion. This form of tube has several decided advantages: The tube can be readily filled without soiling the hands or corroding the screw threads; the tube is also perfectly filled without bubbles and the opening permits of taking of temperature of liquid while in the tube. Mounted. (See illustration, page 325.) Length, mm. 25 $0 100 200 400 600 Each, Net 3.10 3.10 3.10 3.10 3.50 4.25 16132. Polariscope Tubes. Of glass. Same as No. 16130 but unmounted. Length, mm. 2$ Each, Net SO 100 1.05 1.05 400 600 1.05 1.05 1.05 1.05 1.15 1.50 16134. Polariscope Tubes. Of glass; so-called control tubes; for proving the scale of the polariscope. In case. Imported to order. Length, mm. 200 400 Each, Net 25.00 26.25 326 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., I6I58 16164 16162 16136. Glass covers for Polariscope Tubes. 16138. Rubber washers for Polariscope Tubes. Porcelain Plates. See Plates. 16140. Porous Cups or Cells. For batteries. Height, mm. 75 75 95 Diameter, mm. 38 50 50 16142. 1 61 44. 1 61 46. 1 6148. 1 61 50. 16152. Per ten. Net Per ten, Net $1.15 $0.20 (See illustration, page 326.) no 120 150 30 53 56 Each .10 .12 ■IS .18 .20 •25 Height 95 135 185 200 280 Diameter, ram. 62 65 80 80 100 Each .18 .25 .30 Potash Bulbs, Liebig's. With five bulbs. ■35 -75 (See page 326.) Each $0.40 $0.75 $0.80 $0.50 $0.80 Potash Bulbs, Liebig-Dittmar's. (See page 326.) Each Potash Bulbs, Liebig-Kyll's. (See page 326.) Each Potash Bulbs, Mitscherlich's. (See page 326.) Each Potash Bulbs, Mohr's. (See page 326.) Each With Ca CU tube. (See page 326.) Each $1.00 With Ca Clj tube with rubber connections. Each $1.00 With Ca CI2 tube ground in. Each $1.20 Potash Bulbs, Mohr's. 16154. Potash Bulbs, Mohr's. 16156. Potash Bulbs, Mohr's. 16158. Potash Bulbs, Winkler's. Height, mm. 180 250 Each ■75 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 327 i6i6o. Potash Bulbs, Winkler-Kyll's. (See page 327.) Each $1.16 16162. Potato Cutter. Of steel, nickel plated, with ebony handle. A sharp- ened cylinder with sharpened septum. A cylinder, 18 min. diam- eter, may be cut from a potato and divided at one thrust. (See page 327.) Each $1.65 Pouring Irons or Moulds. See Moulds. Precipitating Jar. See Jars. 16164. Presses, Tincture. Strong and durable. (See page 327.) Capacity, liters 1248 Weight, kilos. 9 12 20 30 6.50 g.oo Each, Net 3.00 4.00 Presses, Cork. See Cosk Presses. Pressure Bottle. See Bottles. Prisms, Equilateral. Accurately ground and polished. Crown Glass. Flint Glass. Catalogue Size of face, Each. Catalogue Size of face. Each. Number. mm. Number. mm. 1 61 66 12 $2.50 16174 12 $4.00 1 61 68 25 3-5° 16176 25 6.00 16170 38 6.00 1 61 78 38 9.00 16172 SO 9.00 1 61 80 50 15.00 Prisms, Rectangul ar. Accurately ground and polished. Crown Glass. Flint Glass. Catalogue Size of face, Each. Catalogue Size of face. Each. Number. mm. Number. mm. 16182 6 $2.00 16200 6 $2.00 16184 12 2.25 1 6201 12 2.25 16186 18 2.50 16202 18 2.50 16188 25 3.00 16204 25 3.00 i6igo 32 4.00 16206 32 4.00 16192 38 5-00 16208 38 5.00 16194 44 6.00 16210 44 6.00 1 6196 SO 7-5° 16212 SO 7-50 1 61 98 62 10.00 16214 62 10.00 Prisms, Nicol's. Diagonal Face. Square Face. Extra Wide Field. Catalogue Face Catalogue ; Face Number. mm. Number. mm. 16262 6 * 16280 6 « 16264 7 * 16282 7 * 16266 8 * 16284 8 * 16268 9 * 16286 9 * 16270 10 * 16288 10 * 16272 II * ^6290 II * 16274 12 * 16292 12 * 16276 13 * 16294 13 * 16278 14 * 16296 14 * *Prices on Application. 328 r.ausch & Lomb Optical Co., Rochester, N. Y., U. S. A., ! 16308 I 16310 16298 16300 16306 16302 16304 Probangs. See Brushes, Test Tube. 16298. Psychrometer, August's. Two thermometers of Jena Normal glass, graduated in 1/5 degree from -20° to +So°C., and mounted on nickel plated metal support with cup for wet-bulb thermometer. Height, SCO mm. Each 16300. Pulse Glasses. Each Pump, Acid. See Acid Pump. Pumps, Air. See Air Pumps. Pumps, Filter. See Air Pumps. 16302. Pump. Force or fire engine. Single cylinder. Each 16304. Pump. Double cylinder. Each 16306. Pump. Glass model of force pump; with conical ground glass valves. Each $1.20 16308. Pump. Glass model of suction pump; with conical ground glass valves. Each $1.00 $10.00 $0.30 $1.50 $3-25 New York, Boston, Cliicago, U. S. A., l^rankfurt a/M., Germany. 329 I63I2-I63I6 16324 16309. Pyrometer, Optical. For quickly determining the temperature of in- candescent substances by direct observation. Very useful in iron, gas, glass, and pottery works and all industries having furnaces and incandescent substances to be brought up to and kept at a certain temperature. Every instrument guaranteed. Complete in leather case with shoulder strap, and instructions for use. Imported to order. 16310. Pyrometers. For high temperatures; reading up to iSoo°F. (See illustration, page 329.) j, Diameter of dial, mm. 125 175 Each, Net 25.00 27.00 Pyrometers for Oil Testing. See Oil Testing Apparatus. 16311. Pyrometer, Thermo-Electric, Le Chatelier's. For high temperature. The body, no cm. long, is of iron and has platinum and platinum- rhodium wires running through its entire length, forming the "Couple Le Chatelier.'' Imported to order. 16311a. Pyrometer, Thermo-Electric, Le Chatelier's. With body of porce- lain and enameled inside tube; 20 mm. outside diameter, and 57 cm. long. Imported to order. 16311b. Registering Galvanometer for use with Le Chatelier's Pyrometer. Imported to order. Reading Glasses, Magnifying. These glasses are intended for those examinations which require only slight magnifying power and where large field is desired. They are carefully ground and neatly and durably mounted, having nickeled rim and ebonized wood handle. Catalogue Number. D iam'r in. of Lens mm. Each. Catalogue Number. Diam'r in. of Lens mm. Each. 1 63 1 2 16314 1 631 6 •7 3 SO 62 75 $ .60 .80 1. 00 16318 16320 16322 4 5 87 100 125 $1.50 2.00 2.50 330 Bav\sch & Lomb Optical Co., Rochester, N. Y., U. S, A., 16336 16340 Reading Glasses, Reducing. These glasses are useful in the prepara- tion of illustrations, sketching groups of objects, etc. The lens is double concave, and mounted in nickeled rim with ebonized wood handle. Catalogue Diam'r of I^ens Each. Catalogue Diam's of Lens Each. Number. in. mm. Number. in. mm. 16324 2 50 $1.00 16330 3^2 87 $3.00 16326 25/2 62 1.50 16332 4 100 4.00 16328 3 75 2.00 16334 5 125 5-00 Reagent Bottles. See Bottles, Dropping, and Reagent. 16336. Reagent Case, ilade of cherry, with mitered corners, and fitted with lock. Size, 230 mm. long; 100 mm. wide, and no mm. deep. Holds five IS cc. reagent bottles (No. 12728) and has space for instru- ments. Complete with bottles. Each $3.75 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 331 16342 16340. 16342- 16344- 16346. 16348. Reagent Stand. Holds five 15 cc. reagent bottles (No. 12728) and has receptacles for slides and cover-glasses and a shallow receptacle for instruments. Size, 296 mm. long, 80 mm. wide, 35 mm. deep. Com- plete with bottles. (See illustration, page 331.) Each $2.00 Reagent Stand. Specially adapted for laboratory individual use. Of the various styles of reagent cases and stands, this has proven the most practical. Each student can be supplied with a stand, giving complete set of reagents at comparatively little cost. The bottles are covered by a bell glass the flange of which fits into a groove in the oak base making a dust proof enclosure. Holds seven 15 cc. reagent bottles (No. 12728) and a 30 cc. balsam bottle (No. 12718). Complete with bottles. Each $4.00 Reagents. See Catalogue of Chemicals and Reagents. Receivers, Bniehl's. For distillation in vacuum; with five cylinders. Capacity of cylinders, cc. 25 40 80 Each 6.50 7.50 11.00 ceivers. Glass plain. Capacity, cc. SO 100 250 500 1000 2000 Each Receivers. Glass ; Capacity, cc. Each .08 .09 .12 with tubulature. 50 100 250 .15 .18 .24 .18 Soo •25 -45 .40 -45 .60 332 Eauscli & Lomb Optical Co.. Rochester, N. Y., U. S. A., 16348 16352 i63SO- Receivers. 16352. Receivers. Glass; with two tubulatures. Capacity, cc. 125 250 500 Each .30 .40 .45 Glass; with three tubulatures. Capacity, cc. 125 250 500 .60 Each .35 .50 Receivers for Air Pumps. See Bell Glasses. Reduction Tubes. See Arsenic Tubes, and Tubes. 16354. Reductor. For the determination of phosphorous by a rapid method as described in Blair's "Analysis of Iron," 5th. Edition, page gj. Tube only, with glass stop cock. Each $2.75 16356. Refractometer, Abbe's. Zeiss Optical Works. With Improved Prism Mounting and Compensator. For determining, with white light, the index of refraction for jVp between 1,3 and 1.7 and the dispersion, of liquids and also of solids having one polished surface. The measurements obtained are correct to 2 units of the 4th. deci- mal place, the 3rd. decimal place being read off directly. Direc- tions for use accompany each instrument. In case, with lock and key. Imported to order. (See page 334.) Each, Net $104.00 New York, Boston, Chicago, U. S. A., Frankfurt a/JI., Germany. 333 16356, i63S8 16360, 16364 16358. Refractometer, Abbe's. Zeiss Optical Works. The above instru- ment (No. 16356) without compensator, thereby dispensing with the means of measuring the dispersion, and limiting its use to the determination, by sodium light, of the index of refraction for ^-^ only. In case with lock and key. Imported to order. Each, Net $74.00 16360. Refractometer, Abbe's. Zeiss Optical Works. With heating arrange- ment in connection with prism mounting, and having compensator, giving same range and accuracy of measurements as No. 16356; the double walled metal casing of prism moimting permit- ting the free circulation (as indicated by arrows in figure) of water heated to a given temperature thus insuring a uniform heating of substance under examination. Complete with thermometer having screw-thread attached and graduated in degrees from o to 75°C., in case with lock and key. Imported to order. Each, Net $120.00 16362. Refractometer, Abbe's. Thermometer, with screw-thread attached, and graduated in degrees from to 7S°C. Each, Net $1.00 16364. Refractometer, Abbe's. Zeiss Optical Works. Instrument No. 16360, without compensator, but including thermometer. Imported to order. Each, Net $gi.oo 16366. Refractometer for Butter Examination. Zeiss Optical Works. Pri- marily intended for the preliminary refractometric examination of butter, and also applicable for testing fats, oils, etc.; eye-piece scale gives values between jVd^^I-42 and ^^^=1.49. Furnished with thermometer having screw-thread attached and graduated in J^° from 0° to 50°. Complete in case, with directions for use and in- cluding bottle of standard liquid for verifying the adjustment of eye-piece scale. Imported to order. Each, Net $68.00 334 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 16366, 16368 16370 16376 1 6372 16374 16368. Thermometer, with screw-thread attached and graduated in 54° from 0° to 50° For instrument No .16366. Net $0.90 16370. Special thermometer, for butter and lard testing. Giving directly the highest allowable refractometric scale-numbers between the temperatures of 30° and 40° C; with screw-thread attached. Each, Net $2.00 16371. Refractometers, Pulfrich's. The original pattern as designed by Dr. Pulfrich for use at Bonn University. Price and description on ap- plication. Regulators, Gas and Time. See Gas Regulators. 1637Z. Respirator, Automatic. For protection of throat and lungs in labo- ratories, manufactories, mines, etc., where the atmosphere is filled with dust and poisonous gases. Each, Net $2.00 New York, Boston, Chicago, U. S. -V.. Frankfurt a/JI., Germany. 335 16382 ■^^OJP^ 16384 16386 Rests, Pipette. See Pifette Rests. 16374. Retorts, Copper. For making oxygen. Of heavy polished copper, with iron clamp and brass delivery tube fitting by ground joint. Diameter of tube, 12 mm. (See illustration, page 335.) Capacity, cc. 250 500 1000 2000 16376. Each 1.80 1.00 2.50 3.00 Retorts, Copper. Made of heavy copper, tin lined. For distilling water recovering alcohol, etc. (See illustration, page 335.) Capacity, liters 2 4 8 12 20 16378. Each Retorts, Baloc Glass Capacity, cc. 6.00 7.00 g.oo 11.25 12.50 Plain. (See illustration, page 335.) 25 SO 75 ISO 250 Each Capacity, cc. .09 500 .10 1000 .11 2000 .12 4000 .16 8000 16380. Each Retorts, Baloc Glass Capacity, cc. .22 ^30 .45 With ground glass 25 50 75 •75 stopper. 150 1-25 250 Each Capacity, cc. .20 500 .20 1000 ■25 2000 .30 4000 •35 8000 16382. Each Retorts, Jena Glass. Capacity, cc. •50 Plain; SO .70 .80 1.35 without tubulature. 100 250 500 2.go 1000 Each Capacity, cc. ■13 2000 .18 3000 ■25 4000 .40 8000 ■54 16384. Each Retorts, Jena Glass. Capacity, cc. .80 With SO i.io 1.20 tubulature and 100 250 2.65 glass stopper. 500 1000 Each Capacity, cc. .22 2000 •25 3000 .38 4000 .60 8000 •75 Each Retorts, Jena Glass. 1.15 1.56 1.70 3.50 Larges sizes, up to 40 liters, imported to order. 336 Bausch Sf Lomb Optical Co., Rocheste"-, N. Y., U. S. K., 16396 16398 16392 16400 16388 16404 16386. Retorts, Iron. For distilling mercury, etc. Cover removable, fas- tened by screw clamp; delivery tube ground into cover. Capacity, cc. 250 500 1000 2000 4000 Each 2.00 2.50 3.00 4.50 6.50 16388. Retorts, Iron. Cylindrical form; for making large quantities of oxy- gen, taking from I to iJ4 kilos, of chemicals for a charge. On iron support. Each $13.00 Retort, Skidmore's. See Crucible, Skid-more's. Retort Adapters. See Ad-'\pters. Retort Supports. See Supports. Riders. See Balance Riders. 16390. Rings, Concentric. Of copper, tinned inside; for water baths, etc., with cover. Number in set 3 + 567 Outside diameter, mm. 100 125 150 200 250 Per set .40 .50 .70 16392. Rings, Concentric. Iron; for tripods. Number in set 3 + 5 Outside diameter, mm. 140 165 190 6 1.50 7 260 Per set .40 .50 .70 i.oo 1.50 16394. Rings, Concentric. Porcelain; for water Baths. Wirti covers. Number in set 5 6 Outside diameter, mm. 150 200 Per Set 1,00 1.25 New York, Boston, Chicago, U. S. \., Frankfurt a/M., Germany. 337 16406 16408 I64I6 16422 16446 16426 16396. 16398. 16400. 16402. Rings, Straw. See Straw Rings. Rings, Suberite. See Suberite Rings. Rings, Support. Applicable to any support. With clamp. 75 100 130 175 Diameter, mm. Each ■IS .16 .18 Rings, Support. With extension; to be used with clamp holder. Diameter, mm. 75 100 130 175 Each .08 •15 Roasting Dishes. Battersea. (Sec illustration, page 337.) Diameter, mm. 65 75 100 125 150 175 Per dozen, Net .65 .80 .90 2-75 Roasting Dishes. Denver Fire Clay. Diameter, mm. 75 100 125, ISO 16404. 16406. 16408. 1 6410. 16412. Per dozen, Net .80 .90 i.io 1.75 Rods, Glass. See Glass Rods. Rubber Bags. See Gas Bags. Rubber Bands. Of pure gum; assorted sizes. Rubber Bulbs. For pipettes; of pure gum. Capacity, cc. 2 3 5 10 Per ten .25 .30 .35 i.oo Rubber Bulbs. For large pipettes, syringes, etc. Length, mm. 60 80 90 Diameter, mm. 32 38 45 Per box $1.35 Each •15 Rubber Bulb. With valve; for wash bottles. Capacity, 50 cc. Each $0.25 Rubber Bulb. Pure gum; with long flexible tube; for gas analysis apparatus. Each $0.30 338 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A.. 16414- Rubber Bulb. Double; with net for constant blast. Each $1.50 16416. Rubber Caps. For covering tops of test tubes, cylinders, etc. Diameter, mm. 12 18 25 50 75 Per hundred 2.00 2.35 2.65 5.00 9.35 16418. Rubber Cloth. Heavy, pure gum; for foot blower discs, etc. Per five hundred grams $4.00 16420. Rubber Fingers. Of pure gum; finest quality. Size Small Large Per ten .35 .35 16422. Rubber Gloves. Of pure gum; finest quality; 125 mm. gauntlet. Size 6 to 9 10 to 12 Each 1.40 1.50 16424. Rubber Policeman. For washing down precipitates from the walls of beakers. (Glass rods with rubber tips.) Each $0.10 16426. Rubber Stoppers. Pure gum and best quality; will not harden. Hav- ing had large experience in the line we offer below rubber stoppers which cannot be surpassed in purity or resistance to chemicals. Our print appears on all of our stoppers. Supplied solid unless ordered with one or two holes. Length, 25 mm. Numbers Diameter, top, mm. Diameter, bottom, mm. Approx. number, with two holes, in 450 grams (l lb.) 132 85 60 50 40 32 27 00 I 2 3 4 5 6 14 17 18 20 23 25 27 32 10 12 IS 16/2 18 20 23 26 Per 450 grams (i lb.) Numbers Diameter, top, mm. Diameter, bottom, mm. Approx. number, with two holes, in 450 grams (i lb.) 7 8 37 41 30 33 14 12 9 10 II 12 13 45 SO S6 6s 70 37 42 SO 59 60 4^ 4 16427. Per 450 grams (i lb.) Rubber Stoppers. Red or Numbers Diameter, top, mm. Diameter, bottom, mm. Approx. number with two holes in 450 grams (l lb.) Per 450 grams (i lb.) Numbers Diameter, top, mm. Diameter, bottom, mm. Approx. number with two holes in 450 grams (i lb.) 7 8 9 10 II 12 13 37 41 45 50 56 6S 70 30 33 37 42 SO 59 60 14 12 9 7 6 454 4 16428. Per 450 grams (i lb.) Rubber Tissue. $2.00 $2.00 antimony. Very best quality. 00 o I 2 3 + 56 14 17 18 20 23 25 27 32 10 12 IS 16^ 18 20 23 26 132 85 60 50 40 32 27 20 $3-00 $3.00 Per 25 grams $0.25 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 339 16448 16430- Rubber Tubing. Black; pure gum; best quality; seamless; will not harden; very desirable. Original length, 3^ meters (12 feet.) In.side diameter, mm. 3 5 6 8 9 12 15 18 Per 30 cm. (i ft.) .03 .06 .09 .12 .18 .24 16432. Rubber Tubing. Black; same as above, but heavy wall. Inside diameter, mm. 3 S 6 8 9 12 Per 30 cm. (i ft.) .08 .14 .18 .27 .40 •32 .40 18 •55 -85 340 Bauscli Sr Lomb Optical Co., Rochester, N. Y., U. S. .\., i6434- Rubber Tubing. Pure gum; very elastic; for Gooch crucibles. Diameter mm. 25 30 40 Per 30 cm. (i ft.) .15 .20 .25 16436. Rubber Tubing. Red or antimony. Very best quality. Inside diameter, mm. 3 5 6 8 9 12 15 18 Per 30 cm. (i ft.) .03 .05 .09 .12 .18 .24 .32 .40 16437. Rubber Tubing. Red or antimony; same as above, but heavy wall. Inside diameter, mm. 3 s 6 8 9 12 15 18 Per 30 cm. (i ft.) .07 .11 .14 .17 .20 .30 .40 _ .50 16438. Rubber Tubing. White; corrugated; heavy wall for gas, etc. Inside diameter, mm. 3 5 6 3 9 12 Per 30 cm. (i ft.) .02 .03 .04 .05 .09 .17 16440. Rubber Tubing, Cloth Impression. Extra quality; very flexible; will not split; air-tight and suitable for gas or liquid. This tubing is hand made, specially for us. Inside diameter, mm. 3 S 6 8 g 12 15 18 Per 30 cm. (i ft.) .05 .06 .08 .09 .15 .20 .26 .30 16442. Rubber Tubing, Cloth Impression. Same quality as above, but double thickness. Inside diameter, mm. 3 s 6 8 9 12 15 18 Per 30 cm. (i ft.) .07 .12 .16 .20 .22 .25 .28 .35 16444. Rubber Tubing, Pressure. For use with fitter pumps, etc. Inside diameter, mm. 5 6 8 9 12 Per 30 cm. (i ft.) .20 .22 .26 .30 .40 Rules. See Me.vsures. 16446. Rupert's Drops. (See illustration, page 338,) Per ten $0.20 16448. Saccharometer, Zeiss Portable. For ascertaining the rotatory power and percentage of sugar, etc., in solutions. It provides for the use of a 200-mm. layer of sugar solution, whose rotatory power is mea";- ured in degrees and seconds. The analyser and polarizer are Nice! prisms. Observations are made by holding the instrument in the hand and directing it toward a suitable back-ground. The sugar solution is held by a removable glass cylinder closed at both ends by glass plates. Complete in case with directions. Each, Net $35.00 Saccharometers, Other. See Hydrometers, Polariscopes, Color Com- parators, AND Urinary Apparatus. Safety Tubes. See Funnel Tubes. Sample Bottles for Oils. See Bottles. Sample Tubes. See Vials. Sand for Cleaning Platinum Vessels, etc. See Sea Sand. 16452. Sand Baths. Deep form; of sheet steel. Diameter, mm. 75 100 125 150 175 200 250 Each .10 .12 .15 .20 .25 .30 .40 16454. Sand Baths. Shallow form; of sheet steel. Diameter, mm. 50 75 100 125 150 175 200 250 Each .08 .08 .10 .12 .15 .20 .25 .30 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. lAX 16470 16462 16466, 16468 16456 16458, 16460 16456. Sand Bath or Hot Plate, Ruedorff's. Of wrnught iron; with three row burner as illustrated. Size, mm. 200 x 250 250 x 300 Each 6.00 7.00 16458. Sand Bath or Hot Plate. Of iron. Size, mm. 150x200 200x250 250x300 Each 1.50 16460. Sand Bath or Hot Plate. Same as No. 16458, but on removable legs. Size, mm. 150x200 200x250 250x300 Each 1-75 2.50 16462. Sand Glasses. In polished wooden stand. Time, minutes K /^ i 2 3 5 10 30 45 60 Each .30 .30 .30 .30 .30 .35 .701.251.401.50 16464. Sand Paper. Assorted. Per ten sheets $0.20 Saws, Bone. See Dissecting Instruments. Scales and Scale Pans. See Balances. Scalpels. See Dissecting Instruments. Scissors. See Dissecting Instruments and Shears. 342 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. .\., 16466. Scoop, Agateware, j mm. 16468. Scoop, Agateware. width, 75 mm. 16470. Scoops, Horn. Length, mm 16477 Agate nickel steel. Length, 135 mm.; width, 75 Each $0.22 Flint enameled; acid proof. Length, 135 mm.; Each $0.30 16472. 16474. Length, mm. 100 120 140 160 Each Scorifiers, Battersea. Diameter, mm. .20 ^5 •25 30 38 •30 50 ■35 56 62 Per hundred, Net Diameter, mm. I-I5 1.15 I-I5 68 75 1.16 90 1.17 100 1.30 1^5 Per hundred. Net Scorifiers. Denver fire c Diameter, mm. lay. 38 1.60 2.00 50 2.40 57 2.90 63 3-30 Per hundred. Net Diameter, mm. 1.20 70 1.20 75 1.20 88 1.30 100 2.50 3.00 Per hundred. Net 1.60 2.00 Scorifier Moulds. See Moulds. Scorifier Tongs. See Tongs. Scrapers for Muffles. See Muffi,e Scr.vpers. 16476. Sea Sand. For cleaning platinum vessels, etc. Per five hundred grams $0.10 Shades, Glass. See Bell Glasses. 16477. Shaking Apparatus. Horizontal form, consisting of wagon for carry- ing one bottle five liters capacity, frame, and wheels for either hand or power. Without motor. Each $28.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 343 16486 16488 16490 16492 16484 16478. 16480. 16482. 16484. 16486. Shaking Apparatus. Same as 16477 but for two bottles of five liters capacity. Each $32.50 Shaking Apparatus, Rabe's. For use with Rabe's motor (see mo- tors). Price without motor. Each $7.00 Shaking Apparatus, Rabe's. Complete with motor. Each $13.00 Shears, Brown's. Of polished steel. Length, mm. 150 175 200 250 Each 1.40 1.60 Shears, Cloth. With nickeled blades and japanned handles. Length, mm. 125 150 200 250 300 Each •35 .40 ■5° .80 Shears, Laboratory. Very strong; bolt and nut joint; large handles. 16488. 16490. 16492. Blades nickeled; handles japanned, blades, 60 mm. Shears, Laboratory. Straight blades. Shears, Laboratory. Curved blades. Shears, Tinner's. For cutting metal. Length, mm. 250 290 325 Each 1. 1 5 1.20 Length, 195 mm.; length of Each Each $0.70 $1.00 3S0 375 1.60 2.40 344 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., i6s38 16518-16528 16534 Sieves. Brass gauze, with wooden frame. Diameter, mm. 125 16536 150 200 250 300 16494. Sieves. With 10 mesh. Each .28 .30 •44 •54 .60 16496. Sieves. With 20 mesh. Each .28 ■30 ■44 •54 .60 16498. Sieves. With 40 mesh. Each ■35 .40 ■SO .60 ■75 16500. Sieves. With 60 mesh. Each .40 ■45 .60 ■75 •95 16502. Sieves. With 80 mesh. Each .60 .70 •95 ^■15 1.40 16504. Sieves. With 100 mesh. Each .80 ■95 I.2S 1^65 2.00 Sieves. Brass gauze; with b rass frame. Diameter, mm. 125 200 J65I8. 16520. 16522. 16524. 16526. 16528. 16534. Sieves. Sieves. Sieves- Sieves. Sieves. Sieves. With 10 mesh. With 20 mesh. With 40 mesh. With 60 mesh. With 80 mesh. With 100 mesh. Each, Net Each, Net Each, Net Each, Net Each, Net Each, Net 1. 00 1. 00 1.05 I.IO '■15 I ■30 1^50 ±■50 1^55 1.60 i^7S 2.05 Sieves. Brass gauze, with brass frame, cover, and receiver. Nested, one sieve iitting on top of another; for separating mixed substances into different grades of fineness. Meshes 20, 40, 60, 80, and 100 in each set. Diameter, mm. 125 200 Per set. Net 6.65 10.00 SUdes. See Microscopical Object Slides. Sodium Spoons. See Deflagr.^tion Spoons. 16536. Soil Borer. American form. For taking sample of earth from dif- ferent depths. Has steel boring point screwed to a steel rod with wooden handle. Diameter, 125 mm. Each $7.00 16538. Soil Borer, Fraenkel's. Complete with handle. The handle of the large size is in two sections. When the borer is inserted to the proper depth, a turn of the handle closes the cavity containing the sample of earth. Length, cm. 100 200 Each 18.00 25.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 34.S Q m 16544 16550 16552 16554 16556 16558 16560 i 16562 16542 Soldering Iron and Scraper. Each $0.50 Soldering Iron Heater. For gas. Each $1.50 Soldering Iron, Self Heating. Can be attached directly to gas supply. Each $2.40 Spatulas, Aluminum. Spatula on each end. Length, mm. 130 150 210 250 300 16540. 16542. 16544. 16546. 16548. Each .10 .12 .13 .15 .20 Spatulas, Bone, with Spoon End. See Spoons. 16550. Spatula, Glass. With ground blade. Length, 150 mm. Each $0.15 16552. Spatulas, Horn. Best quality; spatula on each end. Length, mm. 80 100 120 150 180 200 220 240 280 300 Each .06 .08 .10 .12 .15 .20 .25 .35 .40 .50 Spatulas, Horn, with Spoon End. See Spoons. Each •25 •35 •50 .60 .90 Spatulas, Bone. Very best quality; spatula on each end. Leng th, mm 80 100 120 150 170 .^4^5 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., 16564 i6554- Spatulas, Nickel. Solid; spatula on each end. Length, ram. 120 150 180 Each 16556. Spatulas, Porcelain. Length, mra. 105 .40 •50 •6S .85 130 160 185 235 260 290 310 340 Each .25 .25 .35 .35 .55 16558. Spatulas, Porcelain. Spatula on each end. .70 .70 .90 .90 Length, mm. 105 130 160 185 23 Each .28 .28 .40 .40 .60 .80 Spatulas, Porcelain. With Spoon End. See Spoons. 260 290 310 340 .80 16560. Spatulas, Steel. Flexible steel blade with steel handle; nickel plated. Length of blade, mm. 75 100 125 150 Each 16562. .50 .55 -60 .65 Spatulas, Steel. So-called palette knife. Flexible steel blade, with wooden handle. Length of blade, mra. 75 100 125 150 175 200 250 300 Each .25 .26 .30 .35 .50 .60 i.oo 1.70 16564. Spectrometer and Goniometer Combined. This instrument is ofifered as a raost desirable piece of laboratory apparatus. It is mounted on a heavy tripod base with leveling screws. The circle is 15 cm. in diameter, graduated on silver to 1/60°, and reading to 30 sec- onds by means of two verniers and microscopes placed 180° apart. Telescope and collimeter are of 22 mm. aperture and equipped with lenses of high quality. The telescope carries a mirror eyepiece. A comparison prism is attached to the collimeter. A heavy flint dispersing prism with 35 ram. circular faces accompanies the in- strument. Each, Net $90.00 New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 347 16574 i6s72 16566. Support for centering crystals, to be used with No. 16564. Each, Net $24.00 16568. Grating holder for use with No. 16564. Each, Net $8.00 16570. Complementary objective to be used with No. 16564, to facilitate the adjustment of crystals. Each, Net $6.40 16572. Spectroscope, Large Model. With extra dense flint prism, disper- sion 7 degrees; slit and observation telescopes 26 mm. diameter and 234 mm. focus. With telescope for the scale and adjustable slit with comparison prism. The observation telescope is adjustable by micrometer screw; focusing adjustment by rack and pinion. Im- ported to order. Each, Net $115.50 348 Bau-scli .v Form, 299. Freezing, See Ammonia Condensation Apparatus. Fresenius' Arsenic, 15. Fusel Oil, Bromwell's, 229. Herzfeld's, 229. Gas, 229. Bunsen's, 229. Chancel's, 229, Drehschmidt's, 230. for Nitrogen Determination, . 223. Johnson's, 230. Oettel's (Fluorometer) 230. Orsat-Fisher's, 230. Orsat-Lunge's, 230. Orsat- Muencke's, 23 1 . Petterson and Palmquist's, 231. Reich's, 232. Rudorff's, 232. Schilling's, 232. Tief trunk's, 232. Winkler's, 232, 233. Germinating, Schonjahn's, 253. Glazer's Drying and Washing, 186, Herzfeld's Fusel Oil, 229. Hoffman's Lecture, 2yy, 278, 279, 280, j8i, 282, 283. Johnson's Gas, 230. Kjeldahl. See Gas Apparatus for Ni- trogen Determination. Ledebur's Sulphur, 363. Marsh's Arsenic, 15. Marshall's Urea, 393. Melting Point, Roth's, 292. Meyer's Sulphur, 363. Molecular Weight Determination, 299, 300. Nivellating, 307. Oettel's Gas (Fluorometer) 230. Orsat-Fisher's Gas, 230. Lunge's Gas, 230. Muencke's Gas, 231. Petterson and Palmquist's Gas, 231. Rabe's Stirring, 356, 357. Rafter's Counting, 1 46, Reich's Gas, 232. Roth's Melting Point, 292. Rudorff's Gas, 232. Schilling's Gas, 232. Schonjahn's Germinating, 253. 410 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., INDEX. Apparatus, Schultz* Dehydrating, 158. Shaking, 343. Rabe's, 344. Shimer's Combustion, 136. Soxhlet's Extraction, 191. Squibb's Urea, 393. Stirring, 356. Rabe's, 356, 357. Sulphur, Dudley's, 362. Ledebur's, 363. Meyer's, 363. Wiborgh's, 363. Tauber's Drying, 186. Thomas' Dehydrating, 158. Thorn's Extraction, 191. Tieftrunk's Gas, 232. Urea, Marshall's, 393. Squibb's, 393. Vapor Density, Victor Meyer's, 395. Washing, Glazer's Drying and, 186. Water Decomposition, 405. Water Sampling, Esmarch's, 405. Wiborgh's Sulphur, 363. Winkler's Gas, 232, 233. Wiley's Extraction, 191. Wolffliuegel's Counting, 146. Clamp, Universal, 130. Ostwald's, 129. Supports, 363, 364. Bunsen's Universal, 364. Apron, Asbestos, 15. Aquarium Jars, 267. Arendt's Nitrogen Bulbs, 235. Argand Burners, 109. Clay Chimneys for, 109. Erienmeyer's, 109. Arsenic Apparatus, Fresenius', 15. Marsh's, 15. Plates, 15. Tubes, 15. Artery Forceps, 167. Arzberger-Zulkowsky's Air Pump, 3, 4. Asbestos Apron, 15. Board, 15, 16. Cement, 16. Cloth, 16. Cord or Twine, 16. Fiber. See Chemical List. Mittens, 16. Pads, 16, 17. Paper, 17. Powder. See Chemical List. Wool. See Chemical List. Razor, Robb's, 173. Aspirator, Double, 17. Liebig's, 17. Magnus, 17. Aspirator Bottles, 17, 86, 87. Assay Balance, B. & L., 33. B. & L. Circular Beam, 33. Kohlbusch's, 34. Kohlbusch's Portable, 35. Pocket, 36. Assay Balance, Troemner's, 35, 36. Flasks, Bohemian Glass, 200, 201. Furnaces, Bosworth's, 217. Brown's, 218. "Jackass," 218, 219. Ton Weights, 53. Assayer's Combination Furnace, 219. Mills, 298. Attachment. Burette, 104. Centrifuge Four Tube, 125. Filling, Test Tube, 377. Funnel, 216. Atwater's Desiccators, 159. August's Psychrometer, 329. Automatic Burette Clamp, Allihn's, 131. Cement Tester, Improved, 122. Pipettes, 313. Respirator. 335. Water Stills, 354. Zero Burettes, 106. Autopsic Animal Holder, Kitasato's, 12. Avoirdupois Weights, 53, 54. Troemner's, 54. Azotoraeters. See Gas Apparatus: Nitro' meters. . B. Babcock's Ideal Milk Testers, 297. Babo's Absorption Tubes, 387. Funnel Tubes, 217. Gas Generators, 241. Bacteriological Flasks. See Culture Flasks. Bags, Filter, 195. Gas, 237. Rubber. See Bags, Gas. Baker and Adamson's Filter Paper, 197. Balances, 18. Agate, Troemner's New, 44. Analytical, B. & L., 21, 22, 23, 24. B. & L. Circular Beam, 19, 20. Kohlbusch's, 25, 26, 27. Improved, 24. Sartorius', 27, 28, 29, 30. Troemner's, 30, 31. 32, s$. Assay, B. & L., 33. B. & L. Circular Beam, 33. Kohlbusch's, 34. Portable, 35. Pocket, 36. Troemner's, 35, 36. Chemical, 39. Dispensing, Troemner's New, 46. Gas, 238. Hand, 49. Howe's, 41. Laboratory, 38, 40, 41. Improved, 38. Torsion, 43. Troenmer's, 37, 44. New, 45. Micro-chemical, 39. Torsion, 43. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 411 INDEX. Balances, Prescription, Specific Gravity and, 48. Troemner's, 44. Robervahrs, 42. Specific Gravity and Prescription, 48. Specific Gravity, Jolly's Spiral, 46. Kohlbusch's Hydrostatic, 46. Mohr's, 47. Sartorius' Hydrostatic, 47. Westphal's, 48. Torsion, 43. Trip, Harvard, 41. Troemner's, 45. Troemner's, 45. Balance Pans, 55. Riders, 55. Watch Glasses, 55. Weights, 49. Balling's Beer Hydrometers, 262. Sugar Hydrometers, 265. Balloons, 55. Gas, 238. of Glass. See Balloons, Gas. Baloc Glass Beakers, 61, 62, 63, 64. Boiling Flasks, 201. Distilling Flasks, 205, 206, Hoffmann's, 206. Kreuzler's, 206. Ladenburg's, 206. Lunge's, 206. Evaporating Dishes, 163. Flasks, Erlenmeyer Form, 202. Retorts, 336. Balsam Bottles, 87. Bands, Elastic. See Bands, Rubber. Rubber, 338. Bar Magnets, 285. Bark Hydrometers (Tannometers) 262. Barometer Ttibes, 57. Barometers, 56, 57. Aneroid, 56. Bunsen's, 56. Barthel's Alcohol Burners, 109. Blast Lamp, 69, 70. Gasoline Burners, no. Basins, Acid, j. Baskets, 57. Test Tube, 376. Baths, Air. See Drying Ovens. Drying, Filter, 195. Paraffin. See Baths, Water. Sand, 341. or Hot Plates, 342. Ruedorff's, 342. Water, 398, 399, 400. Agateware, 398. Griffin's, 399. Laborntory , 400, 40 1 . Lillie's, 401. Oil Heater for, 401. Mabon's Combination, 402. Miller's, 402, 403. Naples, 404. Reeves', and Drying Ovens, 405. Baths, Water, Simple, 405. Battersea Annealing Cups, 14. Muffles, 306, 307. Scorifiers, 343. Battery, Bunsen's, 57. Crowfoot Gravity, 57. Daniell's, 57. Edison- Lai and's, 58. Grenet's, 58. Grove's, 58, Leclanche Disque, 59. Mesco Dry, 59. Plunge, 59. Skidmore's, 59. Battery Binding Posts, 60. Brushes, 60. Connectors, 60. Cups, Porous. See Porous Cups. Hydrometers, 262. Jars, 60. Knives. 60. Gaume's Scale Acid Hydrometers, 261. Hydrometers, 261. Specific Gravity and, 265. B. & L. Analytical Balances, 21, 22, 23, 24. Assay Balances, 33. Circular Beam Analytical Balances, 19, 20. Circular Beam Assay Balances, 33. Filter Paper, 196, 197. Beads, Glass, 253. Beaker Covers. See Watch Glasses and Glass Plates. Beakers, Aluminum, 61. Baloc Glass, 61, 62, 63, 64. Copper, 61. Imperial Berlin Porcelain, 65. Jena Glass, 64. Phillips', 64, 65. witii Ground Labels, 65. Beckmann*s Boiling Point Method, Latest Form Apparatus for, 299. Old Form Apparatus for, 299. Freezing Method, New Form Apparatus for, 299. Thermometers, 381. Beer and Wort Hydrometers, Kaiser's, 262. Hydrometers, Balling's, 262. Bees Wax, 405. Bell Glasses, 65. Double Walled, 68. High Form, 66. Low Form. 66. Open Top, 67. Narrow Neck, 66. Wide Neck, 67. Swelled Form, 68. Bellows. See Blowers. Bench, Culture Plate, 153. Bennert's Drying Apparatus, i86. Vacuum Gauges (Manometers) 252, 253. Benzine Combustion Furnace, 137. Hydrometers, 262. 412 Bausch S- Lomb Optical Co., Rochester, N. Y., U. S. A INDEX. Berkefeld Laboratory Filters, 1^3. Medical or Laboratory Filters, 193. Physicians' Filters, 193. Berzelius' Alkalimeter, 10. Gas Holders, 245. Pepy's Gas Holders, 245, 246. Reutel's Burette Floats, 109. Bibulous Paper. See Filter Paper. Billing's Culture Flasks, 203. Bimetallic Gas Regulators, Roux', 251. Binding Posts and Screws, Battery, 60. Bink's Alkalimeter, lo. Burettes, 104. Black's Blowpipes, 76. Black Lead or Plumbago Crucibles .Dixon's, 147- Crucible Covers, Dixon's, 147. Bladders, Animal, 68. Blast Blowpipe, Fletcher's Hot, "jt. Burners. See Blast Lamps. Lamps, Alcohol, 68. Turner's Double Jet, 69. Barthel's, 69, 70. Boyce's, 70. Bunsen's, 71. Fletcher's Compound,7i- Glass Blowers', 72, jz- Hoskins', 73. Kerosene, 73. Turner Gasoline, 74. Wiesnegg's, 74. Bleier's Pipettes, 313. Block Tin Pipe, 312. Blocks, Suberite Plates or, 362. Blood Apparatus. See Haemacytometers, Haemaglobinometers and Centrifuges. Blowers, Foot Power, Fletcher's, 75. Hand, 75. Blowers' Blast Lamp. Glass, 72, "j^. Blov/pipe Apparatus, 79, 80. Furnace, Fletcher-Plattner's, 78, t^. Hammers, Colton's, 261. Plattner's, 261. Tips, Platinum, 317. Blowpipes, -jS, 167. Black's, 76. Brazing, Fletcher's, yj. Chemical, Fletcher's Special, tj. Furnace, Hoskins', yj. Hand, Fletcher's Automatic, yj. Hot Blast, Fletcher's, 77. Oxyhydrogen, yj, 78. Plattner's, 78. Blue Glass Plates, 316. Board, Asbestos, rj, 16. Bristol, 100. Board Boxes, Paste, 99. of Health Lactometer, 296. Boats, Combustion, Imperial Berlin Porce- lain, 136. Platinum, 317. Royal Meissen Porcelain, 136. Bohemian Glass Assay Flasks, 200, 201. Boilers, Agateware, 8 J. Double, 81, 82. Boiling Flasks, Baloc Glass, 201. Jena Glass, 201, 202. Point Method, Latest Form, Beckmann*s, Apparatus for, 299. Old Form, Beckmann's, Apparatus for, 299. Bomb Calorimeter, Mahler's, 120. Bone Saw. 174. Spatulas, 346. with Spoon End. See Spoons. Spoons, 351. Bone-Cutting Forceps, 167, Book Covers, Note, 307. Paper, Note, 307. Books, Label, 274. Borers, Cork, 145. Soil, 345. Fraenkel's, 345. Sharpener, Cork, 145. Bosworth's Assay Furnace, 217. Crusher, 151. Botanical Adhesive Tape, 82, Collecting Case or Vasculum, 82. Dissecting Sets, 184. Drying Paper, 82. Genus Covers, 82. Mounting Paper, 82. Pressing Paper, 82. Portable Plant Press, 82. Bottle Caps, 94. Bottles, 86. Aspirator, 86, 87. Balsam, 87. Cedar Oil, 87. Cobalt or Acid, 88. Dropping, 88, 89. Gas, 238. Vogel's, 238. Gas Washing, Allihn's, 251. Bunsen's, 251, Drechsel's, 251. Muencke's, 252. Gutta Percha, 89. Homeopathic. See Vials, Homeopath- ic. Mixing, 90. Narrow Mouth, 83. Pipette, 90. Wollyn's, 90. Pressure, 90. Lintner's, 90. Reagent, Narrow Mouth, 91, 92, 93. Wide Mouth, 93, 94. Reagent Stock ,94. Salt or Wide Mouth, 85, 86. Specific Gravity, 95. American Form, 95. Gay-Lussac's, 95. Hogarth's, 96. Kohl's, 96. Regnauld's, 96. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 413 INDEX. Bottles, Specific Gravity, Schumann's, 96. Sprengel's, 96. Squibb's, 96. Specimen. See Jars and Vials. Tincture or Narrow Mouth, 84, 85. Washing, 97. Faraday's, 97. fitted with Handles, 97. Weighing, 98. Grethen's, 98. Lunge's, 98. Support for, 98. Wide Mouth, 83. with Ground Labels, 86. Woulff, 99. Boverton Redwood's Viscosimeter, 309. Boxes, Culture Plate, 153. Embedding, 189. Glass, 100, 253. Opal, 100. Paste Board, 99. Pipette, 315. Slide, 100. Tin, 100. Turned Wood, 100. Boxwood Measures, 290, Boyce's Acme Burners, 110. Adjustable Burners, 100. Blast Lamp, 70. Brain Knife, 171. Brass Stop Cocks, 357, 358- for Gas Bags. See Gas Bags. Wire, 406. Gauge, 406. Brazing Blowpipe, Fletcher's, 'jy. Bristle Brushes, loi. Bristol Board, 100. Brix' Sugar Hydrometers, 265. Bromwell's Fusel Oil Apparatus, 229. Brown's Assay Furnace, 217. Shears, 344. Bruehl's Receivers, 332. Brushes, Acid, loi. Battery, 60. Bristle, loi. Camel's Hair, loi, 102. Red Sable, 102. Russian Sable, 102. Scrubbing, 102. Test Tube, 102. Tube, 103. Buckets, Agateware, 103. Buchner's Porcelain Funnels, 213. Bulb Pipettes, 313. Tubes. See Tubes, Ignition. Hopkins' Connecting, 233. Kjeldahl's Connecting, 233. Meyer's. See Sulphur Apparatus. Bulbs, Nitrogen, 307, Arendt's, 235. Clemens-Winkler's, 235. French Form, 235. Fresenius', 235. Bulbs, Nitrogen, Shepard's, 235. Stein-Schwarz', 235. Vollhard's, 235. Will-Varentrapp's, 235, 236. Potash, Liebig's, 327. Liebig-Dittmar's, 3 27, Liebig-Kyll's, 327. Mitscherlich's, 327. Mohr's, ^zy. Winkler's, 327. Winkler-Kyll's, 328. Rubber, 338, 339. Bunsen's Absorption Tubes, 387. Alkalimeter, 10. Barometers, 56. Battery, 57. Blast Lamp, 71. Burners, no, in, 113. Adjustable, in. Combination, in. Fletcher's Safety, in. Micro, III. Multiple Tubed, 112. Patent Triplex , 113. Ring Form, 113. Clamps, Tubing, 132. Watch Glass, 133. Combustion Furnace, i -^"j. Condenser Supports, 366. Eudiometers, 190. Filtering Flasks, 207. Gas Apparatus, 229. Washing Bottles, 251. Pneumatic Troughs, 387. Universal Apparatus Support, 364. Bunte's Gas Burettes, 238. Burner Fork, 119. Tip, 119. Tripod, 1 19. Tube, 119. Burners. See Blast Lamps, Lamps, Sand Baths and Stoves. Argand, 109. Clay Chimneys for, 109. Erlenmeyer's, 1 09. Earthel's Alcohol, 109. Gasoline, no. Blast. See Blast Lamps. Boyce's Acme, no. Adjustable, no. Bunsen's, no, in, 113. Adjustable, n i. Combination, in. Fletcher's Safety, in. Micro, in. Multiple Tubed, 112. Patent Triplex, 113. Ring Form, 113. Chaddock's Non-corrodible, 113. Concentric, 114. Dangler's Gasoline, 1 16. Fletcher's Evaporating, 114. Laboratory, 1 14. 414 Bauscli & Lomb Optical Co., Rochester, N. Y., U. S. A. INDEX. Burners, Fletcher's, Low and High Tempera- ture, 1 15. Radial, 1 15. Solid Flame, 1 15. Star, 115. Friedburg's Safety, 1 16, Gas. See Burners, Lamps, Furnaces, Stoves. Hot Plate, 116, 117. Illuminating, 117. See Lamps. Kellogg's Gasoline, 116. Koch's Safety, 118. Laboratory, 113. Test Tube, iig. Tyrell's, 116. Water Heater, Instantaneous, 118. Burette Attachment, 1 04. Caps, 107, 108. Clamps, 108, 130. Allihn's Automatic, 131. Hoffmann's, 131. Lunge's, 131, Floats, 108. Beutel's, 109. Erdmann's, 108. Schulze's, 109. \'ollhard's, 108. Supports, 364. Chaddock's, 365. Ilofmann's, 365. Tips, 104. Burettes, 104, 106, 107, 108. Automatic Zero, 106. Bink's, J 04. Gas, Bunte's, 238. Elliott's, 239. Hempel's, 239, Hempel-Walker's, 239. Gawalowsky's, 105. Gay-Lussac's, 104. Geissler's, 105. Mohr's, 104, 107, 108. Schellbach's, 105, 106. Button Pliers, 322. Calcium Cylinders, Chlorid, or Jars, 128. Glass Support, Chlorid, 128. Holder. Chlorid, 128. Tubes, Chlorid, 128, 129. !Marchand's, 129. Schwartz', 129, Woehler's, 129. Vollhard's, 129. Caldwell's Crucibles, Imperial Berlin Porce- lain, 149. Royal Meissen Porcelain, 150. Lactobutyrometer, 296. Caliper Measure, 291. Folding, 290 . Micrometer Screw, 290. Vernier, 290, 291. Calorimeter, Bomb, Mahler's, 120, Junker's, 119. Standard, 1 19, 120. Camel's Hair Brushes, loi, J02. Camera or Color Comparator, 136. Candles, Paraffin, 120. Standard, 120. Caoutchouc Stoppers. See Rubber Stop- pers. Capped Jars, Screw-, 269. Caps, Bottle, 94. Burette, 107, 108. Rubber, 339. Capsules, Horn, ui. Porcelain, Royal Meissen, 121. Carbon Filter Tubes, 134. Plates for Batteries. See Batteries. Tube Support, 134. Tubes, 134. Carbonic Acid Apparatus. See Alkalime- TERS. Fla-^ks, 203. Cartilage Knife, 171. Shears, 180. Case, Botanical Collecting, or Vasculum, 82. Centrifuge Carrying, 125. Reagent, 331. Casseroles, Agateware, 121. Porcelain, Imperial Berlin, 121, 122. Royal Berlin, 122. Cast Iron Crucibles, 148. Cedar Oil Bottles, 87. Cells nr Cups, Porous. 2^7- Spectroscopic, 350. Cement, Asbestos, 16. Cement Tester, Automatic, Improved, 12?, 123. Gilmore's Needles, 123. \'icat's, 123. Tester Sampler, 123. Testing, Sieves for. See Sieves. Specific Gravity Bottles for. See Bottles. Centrifuge, Bouble Speed, 1 24. Electric, 126, 127. Single Speed, 124. Water Power, 126. Centrifuge Attachment, Four Tube, 125. Blood Lancet, ]\roore's, 125. Carrying Case, 125. Clamp, 125. Haematokrit Guard, 126. Pipette, 126. Tubes. Milk, 126. Percentage, 126. Sedimentation, 126. Shield, 126. Sputum, 126. Chaddock's Burette Supports, 365. Clamps, 131. Non-corrodible Burners, 1 13. Chains, Hooks and, 170. Chalk Sticks or Lime Cylinders, 127. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 415 INDEX. Chamberlain's Culture Flasks, 203. Tubes, 389. Filters, 193, 194. Chambers, Moist, 298. Geissler's, 298. Recklinghausen's or Kleb's, 298. Chamois Skin, 127. Chamot Chemical Microscope, 292. Chancel's Gas Apparatus, 229. Chapman's Air Pump, 4. Couplings for, 4. Charcoal. See Blowpipe Apparatus. Sticks, 127. Chemical Balance, 39. Micro-, 39. Blowpipe, Fletcher's Special, tj. Microscope, Chamot, 292. Thermometers, 377, 378, 379, 380, 381. Standard, 379, 380. Chevalier's Creamometers, 296. Chilled Iron Mortars, 301. Chisels, 127. Chlorid Calcium Cylinders or Jars, 128. Glass Support, 1 38. Holder, 128. Tubes, 128, 129. Marchand's, 129. Schwartz', 129. Vollhard's, 129. Woehler's, 129. Chlorine Hydrometers, 262. Chopper, Meat, 129. Cider Hydrometers, 262. Circular Beam Analytical Balance, B. & L., 19, 20. Claisen's Vacuum Gauges (Manometers), 253. Clamps, 133. Apparatus, Universal, 130. Ostwald's, 129. Burette, 108, 130, 131. AUihn's Automatic, 131. Hoffman's, 131. Lunge's, 131. Centrifuge, 125. Chaddock's, 131. Test Tube, 131. Stoddard's, 131. Tubing, 132. Bunsen's, 132. Hoffman's, 132. Mohr's Pinch Cock, 132. Scheibler's Pinch Cock, 132. Watch Glass, 132. Bunsen's, 133. Clamp Holders, 133. Universal, 133. Cleaners, Test Tube, 377. Clemens-Winkler's Nitrogen Bulbs, 235. Cleveland's Open Fire Tester, 308. Cloth, Asbestos, 16. Emery, 1 89. Rubber, 339. Cloth Impression Rubber Tubing, 341. Cloth Shears, 344. Coal Oil Hydrometers, 262. Pyrometer, Tagliabue's, 308. Cobalt or Acid Bottles, 88. Glass. See Glass Plates, Blue. Cocks, Pinch. See Clamps. Coddington Magnifiers, 287. Coils, Induction, Ruhmkorff's, 266. Colanders, 133. Collecting Case, Botanical, or Vasculum, 82. Tubes, Gas, 240. Cooper's. 2i|0. Color Comparator or Camera, 136. Hehner's, 134. Leed's, 135. Stanner's, 135. Stoke's, 136. Tubes, Comparison, Manganese, 289. Colorimetric Determination Apparatus, 134. Colton's Blowpipe Hammers, 261. Combination Burners, Bunsen's, iii. Furnace, Assayers, 219. Hoskins' Muffle & Crucible, 226. Water Baths, Mabon's, 402. Combustion Apparatus, Shimer's, 1 36. Boats, Platinum, 317. Porcelain, Imperial Berlin, 136. Royal Meissen, 136. Furnace, Benzine, 137. Bunsen's, 137. Fletcher's, 137. New Pattern, 138. Fuch's Latest Pattern, 139. Glazer's, 139. Lothar-Meyer's, 1 39. Spoons.' See Deflagration Spoons. Tubes, 140. Platinum, 317. Porcelain, Imperial Berlin, 140. Royal Berlin, 141. Tubing. See Glass Tubing. Comparator, Color, Hehner's, 134. Lecd's, 135. or Camera, 136. Stanner's, 135. Stoke's, 136. Comparisoi) Color Tubes, Manganese, 289. Tubes. See Colorimetric Determina- tion Apparatus. Compound Blast Lamp, Fletcher's, 71. Compressed Air and Vacuum Air Pump, 7. Concentric Burners, 114. Rinfes, 337. Condenser VSupports, 366. Bunsen's, 366. Hdfmann's, 366. Tubes, 144. Condensers, 141, 144. AUihn's, 141. Hopkin's, 141. Kjeldahl's, 233. Liebig's, T41, 142. Soxhlet's, 143, 416 Bausch & Lomb Optical Co., Rochester, N. Y., LT. S. A., INDEX, Condensers, Spiral, 143. Sulphurous Acid, 1 43. Goebel's, 143, Liebig's, 143. Mej'cr's, 143. Woehler's, 144. Cones, Measuring, 291. Connecting Bulb Tubes, Hopkins', 233. Kjeldahl's, 233. Tubes, 388. Connectors, Battery, 60. Control Tubes, Polariscope, 323. Cooper's Gas Collecting Tubes, 240. Coplin's Staining Jars, 353. Copper Beakers, 61. Crucibles, 148. Distilling Flasks. See Retorts^ Copper. Funnels, 211. Measures, 289. Percolators, Tin or, 311. Retorts, 336. Wire, 406. Gauze, 407. Cord or Twine, Asbestos, 16. Cork Borer, 145. Sharpener, 145. Extractor, 146. Files, 193. Knives, 273. Plates, 145. Press, Lever, 145. Rotary, 145. Screw, 145. Self-Pulling, 145. Tongs, 146. Corks, 144, 145. Counting Apparatus, Esmarch's, 146. Rafter's, 146. Wolffhuegel's, 146. Plate, Jeffer's, 147. Couplings for Richard's Air Pump, 5. Chapman's Air Pump, 4. Cover Glass Forceps, 168. Cornet's, 168. Ehrlich's, 168. Novy's, 168, 169. Stewart's, 169. Cover Glasses, 135. jMicroscopical, 295. Covers, Annealing Cup, 14. Beaker, 65. Botanical Genus, 82. for Beakers, etc. See Glass Plates and Watch Glasses. Note Book, 307. Creamometers, 296. Chevalier's, 296. Crowfoot Gravity Battery, 57. Crow-quill Pens, 310. Lithographic, Gillott's, 310. Crucible Combination Furnaces, Hopkins' Muffle &, 226. Covers, Denver Fire Clay, 148. Crucible Covers, Dixon's Black Lead or Plum- bago, 147. Furnace, Fletcher's, 220, 221. Improved, 221, 222. Kerosene, 222. Hoskin's, 222. Tongs, 382, 383. Platinum Tipped, 319. Blair's, 320. Crucibles, 147. Copper, 148. Denver Fire Clay, 148. Dixon's Black Lead or Plumbago, 147. Hessian Sand, 148. Iron, 148. Cast, 148. Skidmore's, 149. Nickel, Pure, 149. Platinum, 317. See Combustion Apparatus, Shim- er's. Gooch Form, 317, 318. Porcelain, Caldwell's Imperial Berlin, 149- Royal Meissen, 150. Gooch's Imperial Berlin, 149. Royal Berlin, 150. Imperial Berlin, 14S, 150. Rose's Imperial Berlin, 150. Royal Berlin, 150. Royal Meissen, 1 50. Silver, 150. Crusher, 151. Bosworth's, 151. Hand, 151. Ore, 152. Weath erhead's, 152. Crystallation Dishes, 162. Culture Dish, 162. See Moist Chambers. Flasks, Erlenmeyer's, or Koch's, 204. Fernbach's Antitoxine, 204. BVeudenreich's, 204. Chamberlain's or Pasteur's, 203. Listers', 204. Miquel's, 204. Pasteur's Pipette, 204. Roszahegzi's, 204, 205. Sternberg's, 205. Jars, Novy's, 267, 268. Improved, 268. Plate Bench, 153. Box, 153. Plates, 153. Slide, 153. Tubes, 389. Chamberlain's, 389. Gayon's, 389. Gayon-Dupetit's, 389. Pasteur's, 389. Roux', 389. Cup Covers, Annealing, 14. Cups, Eattersea ^Vnnealing, 14. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 417 INDEX. Cups, Battery, Porous. See Porojjs Cups. Miner's, 154. or Cells, Porous, 327. Swimming, 371. Cupel Moulds, 154. Rake, 154. Shovel, 154. Tongs, 384. Tray, 154. Cupels, Hoskin's, 153. Torry and Eaton's, 154. Curtiss' Patent Support or Standard, 370. Cutlers, Glass, 253. Potato, 328. Cylinder Jars, 268. Cylinders, 155, 156. Chlorid Calcium, or Jars, 128. Drying. See Chlorid Calcium Cylin- ders. Gas. See Gas Holders. Lime, or Chalk Sticks, 127. Mixing, 156, 157. for Nessler's Ammonia Test, 157. Reagent, 157. Steel. Urine, 394. D. Dairy Thermometers, 381. Dana's Mineralogical Hammers, 260. Daniell's Battery, 57. Hygrometers, 266. Dangler's Gasoline Burners, 116. Davy's Safety or Miner's Lamp, 276. Decanting Jars, 26S, 269. Decomposition Apparatus, Water, 405. Deflagration Globes, 157. Spoons, 157, 158. Dehydrating Apparatus, Schultz', 158. Thomas, 158. Demijohns, 158. Demonstration Lenses, 283, 284. Microscopes, 294. Density Apparatus, Vapor, Victor Meyer's, 395- Denver Fire Clay Crucibles, 148. Crucible Covers, 148. Desiccator Plates, 161. Support, 161. Desiccators, 159- Atwater's, 159. Fresenius', 159. Fruhling and Schultz', 159. Hempel's, 159. Reinhardt's, 160. Scheibler's, 160. Vacuum, 160. Determination Apparatus, Fat, Soxhlet's. See Extraction Apparatus, Molecular Weight. Apparatus for Beckmann's Boiling Point Method, Latest Form, 300. Old Form, 299. Determination Apparatus, Molecular Weight. Apparatus for Beckmann's Freez- ing Method, New Form, 299. Dialyzer Tubhig, 161. Dialyzers, 161. Graham's 161, Parchment Paper for, 161. Diamond, 161. for Cutting Glass. See Glass Cutter. Ink, 266. Mortars, Leed's, 300. Platlner's, 300. Diaphanoscope, \''ogers, 1 6 r . Dies, See Figures and Letters. Diffusion Shells, Schleicher and Schull's, 162. Digesting and Dissolving Flasks. See Gas Apparatus, Kjeldahl. Shelf, Kjeldahl's, 233, 234, Digestion Apparatus. See Kjeldahl Appa- ratus. Dippers, Agateware, 162. Direct X'lsion Spectroscope, 350. Dish Holders, Petri, 166. Dishes, Acid. See Acid Basins. Crystallization, 162. Culture, 162. See Moist Chambers. Evaporating. See Kettles. Agateware, 163. Aluminum, 163. Baloc Glass, 163. Iron, 163. Jena Glass, 163. Nickel, Pure, 163. Elatinum, 318. Porcelain, Imperial Berlin, 163, 164 Royal Berlin, 164, 165. Meissen, 165. Silver, 165. German Silver, 165. Lead, 165. Moore's Staining, 352. Pasteur, 165. Petri, 165, 166. Platinum, 318. Preparation, 166. Roasting, 338. Staining, 166, 352. See Watch Glasses. Moore's, 352. Porcelain, 353. Steinach's, 352. Stender, 166, 167. Dispensing Balance, Troemner's New, 46. Displacement Apparatus, 167. Disque Battery, Leclanche, 59. Dissecting Forceps, 169, 170. Instruments, 167. in Sets, 181. Microscopes, 295. Needles, 171, 172. 418 Bausch 6* Lomb Optical Co., Rochester, N. Y., U. S. A., INDEX, Dissecting Pans, 172. Scalpels, 175, 176. Scissors, 177, 178. Sets, 181, 182, 183, 184. Botanical, 184. Johns Hopkins University, 185. Anatomical, 185. Histological, 185. Dissolving Tubes, 136. Distilling Apparatus, 186. Flasks, or Alembics, 205. Baloc Glass, 205, 206. Copper. See Retorts, Copper. Hoffman's Baloc Glass, 206. Jena Glass, 205. Kreuzler's Baloc Glass, 206. Ladenburg's Baloc Glass, 206. Lunge's Baloc Glass, 206. and Tubes, TVactional. See Flasks AND Tubes. Tubes, 389. Glinsky's, 389. , Henniger-LeBell's, 389, 390. Hopkins', 390. Distributors, Gas, 240. Dittmar's Potash Bulbs, Liebig-, 327. Dixon's Black Lead or Plumbago Crucible Covers, 147. Crucibles, 147. Doebereiner's Hydrogen Lamps, 276. Domestic Water Stills, 359. Double Aspirator, 17. Exhaust Filters, 194. Jet Alcohol Blast Lamp, Turner's, 69. Wall Drying Ovens, 187, 188. Walled Bell Glasses, 68. Doublet Magnifiers, 287, Doremus' Ureometer, 394. Doremus-Hind's Ureometer, 394. Drawing Pencils, 310. Drechsel's Extraction Apparatus, igr. Gas Washing Bottles, 251. Drehschmidt's Gas Apparatus, 230. Droppers. See Pipettes, Bottles. Dropping Bottles, 88, 89, Funnels, Walter's Separatory or, 216. Drops, Rupert's, 341. Dry Battery, Micro, 59. Drying Apparatus, 186. Bennert's, 186. Tauber's, 186. Cylinders. See Chlorid Calcium Cyl- inders. Ovens, Double Wall, 187, 188. Fresenius', 188. Porcelain, Royal Berlin, 1 88. Rammelsberg's, 188. Reeves' Water Baths and, 405. Single Wall, 186, 187. and Washing Apparatus, Glazer's, 186. Paper, Botanical, 82. Plates, 1 88. Tubes, Liebig's, 188. Drying Tubes, Mitscherlich'Sf 188. See Chlorid Calcium Tubes, Dudley's Gas Generators, 241. Sulphur Apparatus, 362. Viscosity Pipette, 309. Dufios' Gas Generators, 241. Dunham's Gas Regulators, 249, 250. Dupetit's Culture Tubes, Gayon-, 389. E. Earth Thermometers, 381. Eaton's Cupels, Torry and, 154. Edison-Laland's Battery, 58. Ehrlich's Cover Glass Forceps, 168. Einhorn's Fermentation Saccharometer, 392, Einhorn-Fiebig's Saccharometer, 392. Elastic Bands. See Rubber Bands, Electric Centrifuge, 126, 127. Furnace, Sauveur and Whiting's, 223. Motors, Rochester, 303. Porter, 302, 303. Polariscope Lamps, 325. Pyrometer, Thermo-, Le Chatelier's, 330. Stoves, Portable, 360. Electrolytical Supports, 366. Elliott's Fire Tester, 307. Gas Burettes, 239. Embedding Boxes, 189. Tables, 189. Embryo Jars, 269. Embryological Watch Glasses, 397. lunery Clbth, 189. Paper, 189. Emmerling's .Absorption Tubes, 387., Equilateral Prisms, 328. Erdmann's Alkalimeter, Geissler-, 10. Floats. See B urette I'loats. Furnaces, 223. Erlenmeyer Argand Burners, 109. Culture Flasks, Koch's or, 204. Form Flasks, Baloc Glass, 202, Jena Glass, 203, Esbach's Albuminometer, 391. -Schelenz' Albuminometer, 392. Esmarch's Counting Apparatus, 146. Water Sampling Apparatus, 405, Ether Hydrometer, 262. Tubes, 390. Eudiometers. See Gas Measuring Tubes. Bunsen's, 190. Hoffman's, igo. Mitscherlich's, 190. LTre's, jgi. Evaporating Burners, Fletcher's, 114. Dishes, Agateware, 163. Aluminum, 163. Baloc Glass, 163. Iron, 163. Jena Glass, 163. Nickel, Pure, 163. Platinum, 318. Porcelain, Imperial Berlin, 163, 164. Royal Berlin, 164, 165. Meissen, 165. New York, Boston, Chicago, U. S. A,, Frankfurt a/M., Germany, 419 INDEX. Evaporating Dishes, Silver, 165. Excelsior Stills, Jones', with Condensers, 355. Exhaust Filters, Double, 194. Experimental Furnaces, Fletcher's Lecture and, 224, 225. Extraction Apparatus, 191. Drechsel's, igi. Soxhlet's, 191. Thorn's, 191. Wiley's, 191. Paper, 192, Thimbles, 192. Extractor, Cork, 146. F. Faraday's Washing Bottles, 97. Farinatom, Heinsdorf's, 192. Fat Determination Apparatus, Soxhlet's. See Extraction Apparatus. Fermentation Saccharometers, Einhoni's, 392. Tubes, 392. Fernbach's Antitoxine Culture Flasks, 204. Feser's Lactoscope, 297. Fiber, Asbestos. See Chemical List. Fiebig's Saccharometer, Einhorn-, 392. Figures, 192. File Handles, 193. Files, Cork, 193. Flat, 192. Round, 193. Triangular, 193. Filling Attachment, Test Tube, 3^7. l"''ilter Apparatus, 195. Bags, 195. Cones, Platinum, 318. Drying Bath, 195. Flasks. See Flasks. Hooks, 195. Paper, 196, 200. Baker and Adamson's, 197. B. & L., 196, 197. Munktell's Swedish, 197, 19S, 199. S. & S., 199, 200. Plates. See Plates. Pumps. See Air Pumps. Racks, 200. Rings, 200. Stands. See Supports. Tubes, 194, 390. Carbon, 134. Filtering Apparatus, 319. Flasks, 207. Bunsen's, 207. Filters, Berkefeld, 193. Laboratory, 193, Medical or Laboratory, 193. Physicians', 193. Chamberlain, 193, 1 94. Double Exhaust, 194. Kitasato's, 194. Mucncke's, 194. Pukal's, 195. X^'ingers, Rubber, 339. Fire Clay Crucible Covers, Denver, 148. Fire Clay Crucibles, Denver, 148. Tester, Elliot's, 307. Foster's, 308. Open, 308. Cleveland's, 308. Fisher's Air Pump, 4. Gas Apparatus, Orsat-, 230. Flasks, 203. Assay, Bohemian Glass, 200, 201. Bacteriological. See Flasks, Culture. Boiling, Baloc Glass,. 201. Jena Glass, 201, 202. Carbonic Acid, 203. Culture, Billings', 203. Chamberlain's (or Pasteur's), 203. Erlenmeyer's (or Koch's), 204. F'ernbach's Antitoxine, 204. Freudenreich's, 204. Lister's, 204. Miquel's, 204. Pasteur's Pipette, 204. :< Roszahegzi's, 204, 205. Sternberg's, 205. Digesting and Dissolving. See Gas Ap- paratus, KjELDAHL. Distilling, or Alembics, 205. Baloc Glass, 205, 206. Copper. See Retorts, Copper. Hoffman's, Baloc Glass, 206. Jena Glass, 205. • Kreuzler's, Baloc Glass, 206. Ladenburg's, Baloc Glass, 206. Lunge's, Baloc Glass, 202. Erlenmeyer Form, Baloc Glass, 202. Jena Glass, 203. Filtering, 207. Bunsen's, 207. Generating. See Gas Bottles, Johnson's, 208. Joliet, 207. Kjeldahl's, 234. Jena Glass, 234. Parting. See Flasks, Assay. Precipitating. See Beakers, Phillip's. Volumetric, 209, 210. or Liter, 20S. Giles', 210. Jena Glass, 209. Kohlrausch's, 210. Flat Files, 192. Fleischl's Haemometer, 259, 260. Fletcher's Brazing Blowpipe, yy. Combustion Furnace, 137. New Pattern, 138. Compound Blast Lamp, 71. Evaporating Burners, 114. Foot Power Blowers, 75. High and Low Temperature Burners, 115. Hot Blast Blowpipe, 77. Laboratory Burners, 114. Perfected Injector Furnaces, 226, 227, 228. Radial Burners, 115. 420 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A. INDEX. Fletcher's Safety Bunsen's Burners, 1 1 1 Solid Flame Burners, 115. Special Chemical Blowpipe, Tj. Star Burners, 115. Fletcher-Plattner's Blowpipe Furnace, 78, 79. Floats, Burette, 108. Beutel's, 109. Erdmann's, 108. Schulze's, 109. Vollhard's, 108. Foil, Platinum, 319. Tin, 382. P'olding Caliper Measures, 290. Wooden Hand Rests, 295. Foot Power Blowers, Fletcher's, 75. Forceps, 1 70, 210, 211. Artery, 167. Bone Cutting, 167. Cover Glass, 168. Cornet's, 168. Ehrlich's, 168. Novy's, 168, 169. Stewart's, 169. Dissecting, 1 6g, 1 70. Pinning, 312. Platinum Tipped, 320. Fork, Burner, 119. Foster's Fire Tester, 308. Fountain Pens, 311. Four Tube Atachment, Centrifuge, 125. Fractional Distilling Flasks and Tubes. See Flasks and Tubes. Franke's Nitrometers, 236. Freezing Apparatus. See Ammonia Conden- sation Apparatus. Method, New Form, Beckmann's Appar- atus for, 299. French Form Nitrogen Bulbs, 235. Fresenius' Alkalimeter, 10. Arsenic Apparatus, 15. Desiccator, 159. Drying Ovens, 188. Nitrogen Bulbs, 235. -Will's Alkalimeter, 10. Freudenreich's Culture Flasks, 204. Friedburg's Safety Burners, 116. Fruhling and Schultz' Desiccators, 159. Funnel Attachment, 216. Supports, 367, 368. Tubes, 216, 217. Babo's, 217. \'^ogers, Z17. Welter's, 217. Funnels, 211, 212. Agateware, 211. Agate Nickel Steel, 211. Copper, 211. Dropping, Walter's Separatory or, 216. Hot Water, 214. or Steam, 214. Porcelain, 213. Euchner's, 213. Hirsch's, 213, Funnels, Rubber, 213. Separatory, 214, 215. Squibb's, 215. Tin, 213. Victor Meyer, 216. Furnace Blowpipes, Hoskins', 229. Furnace, Assay, Bosworth's, 217. Brown's, 218. "Jackass," 218, 219. Assayer's Combination, 219. Blowpipe, Fletcher-Plattner's, 78, 79. Combination, Hoskin's Muffle and Cruci ble, 22(i. Combustion, Benzine, 137. Bunsen's, 137. Fletcher's, 137. New Pattern, 138. Fuch's Latest Pattern, 139. Glazer's, 139. Lothar-Meyer's, 139, Crucible, Fletcher's, 220, 221. Improved, 221, 222. Kerosene, 222. Hoskins', 222. Electric, Sauveur & Whiting, 223. Erdmann's, 223. Fletcher's Lecture and Experimental, 224, 225. Hempel's, 223. Injector, Fletcher's Perfected, 226, 227, 228. Ladle, 224. Muffle, 225. Hoskins' Latest Design, 225, 226. Fusel Oil Apparatus, Bromwell's, 229. Herzfeld's, 229. G. Gall's Acidimeter, ^. Gas Apparatus, 229. Bunsen's, 229. Chancel's, 229. Drehschmidt's, 230. (Fluorometer), Oettel's, 230. Johnson's, 230. Orsat- Fisher's, 230. Orsat-Lunge's, 230- Orsat-Muencke's, 23 1. Petterson and Palmquist's, 231. Reich's, 232. Rudorff's, 232. Schilling's, 232. Tieftrunk's, 232. Winkler's, 232, 233. Bags, 237, Balances, 238. Balloons, 238. for collecting Gases. See Balloons. Bottles, 238. Vogel's, 238. Burners. See Burners, Lamps, Fur- naces, Stoves. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 421 INDEX. Gas Burette, Bunte's^ 238. Eliott's, 239. Hempel's, 239. Hempel- Winkler's, 239. Collecting Tubes, 240. Cooper's, 240. Cylinders. See Gas Holders. Cooper's, 240. Generators, 240, 241. Babo's, 241. Dudley's, 241. Dufios', 241. Gasoline, 244, 245. Kekule's, 241. Kipp's, 242. Muencke's, 243. Norblad's, 243. Skidmore's Normal School, 243. Steenbuch's, 244. Wait's New, 244. Holders, 246. Berzelius', 245. Berzelius-Pepy's, 245, 246, IMitscherlich's, 246. Measuring Tubes, 346. Palladium Tube, Hempel's, 247. Pipette, Etting's, 247. Hempel's, 247, 248. Polariscope Lamp, 325. Pressure Regulator, 251. Regulators, 249. Dunham's, 249, 250. Muencke's Improved, 250. Reichert's, 250. Improved Form, 250. Reichert-Novy's, 250. Roux' Bimetallic, 351. Soxhlet's, 251. Stoves, 360, 361. High Form, 360. Low Form, 361. Washing Bottles, AlHhn's, 251. Bunsen's, 251. Drechsel's, 251. Muencke's, 252. Tubes, Scheibler's, 253. Gasoline Blast Lamp, Turner, 74. Burners, Barthel's, no. Dangler's, 116. Kellogg's, 116. Gaa Generators, 244, 245. Hydrometers, 262. Gasometers. See Gas Measuring Tubes, Eu- diometers. Gauge Tubes, 253. Gauges, Spring, 252. Vacuum (Manometers), 252. Bennert's, 252, 353. Claisen's, 253. Wire, 253. See Measure. Gauze, Platinum, 319. Wire, Brass, 406. Gauze Wire, Copper, 406. Iron, 407. Gawalowsky's Burettes, 105. Gay-Lussac's Alkalimeter, 10. Burettes, 104. Hydrometers, Alcohol, 261, 262. Specific Gravity Bottles, 95. Supports, 368. Gayon's Culture Tubes, 389. Gayon-Dupetit's Culture Tubes, 389. Geissler's Air Pump, 4. Alkalimeter, 10, 11. Burettes, 105. Glass Stop Cocks, 358, 359. Moist Chambers, 298. Geissler-Erdmann's Alkalimeter, 10. Generating Flasks, 207. Generators, Gas, 240, 241. Babo's, 241. Dudley's, 241. Duflos', 241. Gasoline, 244, 245. Kekule's, 241. Kipp's, 242. Muencke's, 243. Norblad's, 343. Steenbach's, 344. Skidmore's Normal School, 243. Wait's New, 244. Genus Covers, Botanical, 82. German Silver Dishes, 165. Wire, 406. Germinating Apparatus, Schonjahn's, 253. Gillott's Lithographic Crow-quill Pens, 310. Glass Assay Flasks, Bohemian, 200, 201. Balloons. See Gas Balloons. Beads, 253. Beakers, Baloc, 61, 62, 63, 64. Jena, 64. Blowers' Blast Lamp, 72, 73. Boiling Flasks, Baloc, 201. Jena, 201, 202. Boxes, TOO, 253. Opal, 100. Cutters, 253, 254- Distilling Flasks, Baloc, 205, 206. Hoffmann's, 206. Kreuzler's, 206. Ladenburg's, 206. Lunge's, 206. Jena, 205. Evaporating Dishes, Baloc, 163. Jena, 163. Flasks, Baloc, Erlenmeyer Form, 202. Jena, Erlenmeyer Form, 203. Ink (Diamond Ink). See Ink. Kjeldalil's Flasks, Jena, 234. Measures. See Graduates. Mortars, 301. Plates, Blue, 316. Circular, 316. Heavy Plate, 316. Ruby, 316. 422 Bausch 6- Lomb Optical Co., Rochester, N. Y., U. S. A., INDEX. Glass Plates, Square, 316. Powder. See Chemical Catalogue. Retorts, Baloc, 336. Jena, 336. Rod, 254. Shades. See Bell Glasses. Spatulas, 346. Spoons, 351. Stirrers, 254. Stop Cocks, 358, 359. Geissler's, 35S, 359. Support, Chlorid Calcium, 128. Trays, 384. Troughs, 386. Tubing, 254. Barometer, 254. Capillary, 254. Combustion, 254. Volumetric Flasks, Jena, 209. Wool, 254. Glasses, Bell, 65. Double Walled, 68. High Form, 66. Low Form, 66. Open Top, 67. Narrow Neck, 66. Wide Neck, 67. Swelled Form, 68. Hour. See Sand Glasses. Minim. See Graduates. Pulse, 329. Reading, Magnifying, 330. Reducing, 331. Sand, 342. Sedimentation, 392, 393. Large Size. See Test Glasses. Test, 374. See Urinary Apparatus, Sedimen- tation Glasses. Watch, 397. Balance, 55. Embryological, 397. Syracuse Solid, 397. Glazed Paper, 310. Glazer's Combustion Furnace, 139. Drying and Washing Apparatus, 186. Glinsky's Distilling Tubes, 389. Globes, Deflagration, 157. Gloves. See Rubber Gloves and Asbestos ^flTTENS. Rubber, 339. Glycerine Hydrometers, 262. Goebel's Sulphurous Acid Condensers, 143. Goggles, 255. Gold Washing Horn, 255. Pan, 255. Goldbeaters Skins, 255. Goniometer and Spectrometer Combined, 347, 348. Cooch Form Platinum Crucibles, 317, 318. Gooch's Imperial Berlin Porcelain Crucibles, 149. Royal Berlin Porcelain Crucibles, 150. Gower's Haemacytometer and Haemaglobino- meter, 259. Haemacytometer, 256. Haemaglobinoraeter, 258. Simplified Form, 259. as modified by Haldane, 259. Graduated Pipettes, 315. Test Tubes, s?^- Graduates, 255, 256. Graham's Dialyzers, 161. Gram Weights, 50, 51, 52, 53. B. & L., 50- Analytical, 49. Single Analytical, 50. Metric, Troemner's, 53. Single, 51, 52. Troemner's, 54. Gravity Battery, Crowfoot's, 57. Grenet's Battery, 58. Grethen's Weighing Bottles, 98. Griffin's Water Baths, 399. Grinders. See Crushers. Ground Labels, Beakers with, 65. Bottles with, 86. Grove's Battery, 58. Guard for Haematokrit, Centrifuge, 126. Gummed Labels, 273. Gutta Percha Bottles, 89. H. Haemacytometers and Haemaglobinometers, Gower's, 259. Gower's, 256. Miescher's, 258. Thoma-Zeiss', 257, 258. Ilaemaglobin Outfit, Physician's. 259, Scale, Tallquist's, 259. Haemaglobiiiometer, Gower's, 258, Haemacytometer and, 259. as modified by Haldane, 259. Simplified rorni, J59. Haematokrit, Guard for, Centrifuge, 126. Haemometer, Fleisclil''^, 259. as modified by iliesclier, 260. Ilaensch Polariscopes, Schmidt and, 324. Hair Brushes, Camel's, loi, 102. Haldane, Gower's Haemaglobinometer a.s modified by, 259. Hammers, 260. Colton's Blowpipe, 261. Plattner's Blowpipe, 261. Mineralogical, Dana's, 260. Water, 405. Hand Balance, 49. Blowers, 75. Crusher, 151. Rests, Folding Wooden, 295. Handle Air Pump, Lever, 8, 9. Handles, File, 193. Washing Bottles Fitted with, 97. Hard Rubber Trays, Genuine, 384. Standard, 385. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 423 INDEX. Harvard Trip Balance, 41. Hastings' Aplanatic Triplet Magnifiers, 286. Health Board Lactometers, 296. Heaters for Lillie's Water Baths, Oil, 401. Water. See Burners. Heeren's Pioscope Milk Testers, 298. Hehner's Color Comparator, 134. Heinsdorf's Farinatom, 192. Hempel's Desiccators, 159. Furnaces, 223. Gas Burettes, 239. Palladium Tubes, 247. Pipettes, 247, 248. Hempel-Winkler's Gas Burettes, 239. Henninger-Le Bell's Distilling Tubes, 389, 390. Herzfeld's Fusel Oil Apparatus, 229. Hesse's Aeroscope, 3. Hessian Sand Crucibles, 148. Higgins' Ink, 267. High Form Bell Glasses, 66. High Temperature Burners, Fletcher's Low and, 115. Thermometers. See Pyrometers. Hind's Ureometer, Doremus-, 394. Hirsch's Porcelain Funnels, 213. Histological Dissecting Sets, Johns Hopkins, 185. Hoffmann's Burette Supports, 365. Condenser Supports, 366. Distilling Flasks, Baloc Glass, 206. Eudiometers, igo. Lecture Apparatus, 277, 278, 279, 2S0, 281, 282, 283. Tubing Clamps, 132. Hogarth's Specific Gravity Bottles, 96. Holders, Animal, 12. Autopsic, Kitasato's, 12. Kitasato's, 12. Latapie's, 13. Vaughan's, 13. Voges', 13. Burette, or Burette Stands. See Sup- ports. Chlorid Calcium, 128. Clamp, 133. Universal, 133. Gas, 246. Berzelius', 245. Berzelius-Pepy's, 245, 246. Mitscherlich's, 246. Needle, 172. Pen, 310. Petri Dish, 166. Platinum Wire, 321. Test Tube, 377. for Triangles. See Platinum Triangles. Holt Milk Test Set, 296. Homeopathic Bottles. See Homeopathi c Vials. Vials, 396. Hones, 170. Hooks and Chains, 170. Hooks, Filter, 195. Hopkins' Condensers, 141. Connecting Bulb Tubes, 233, Distilling Tubes, 390. Horismascope, 392. Horn Scoops, 343. Spatulas, 346. with Spoon End. See Spoons. Spoons, 351. Horn's Nitrometers, 236. Horns, Gold Washing, 255. Horseshoe Magnets, 285. Hoskin's Blast Lamp, 73. Crucible Furnaces, 222. Cupels, 153. Furnace Blowpipes, 229. Muffle and Crucible Combination Fur- naces, 226. Furnaces, Latest Design, 225. Hot Air Motors, 305. Blast Blowpipe, Fletcher's, t^. Plate Burners, 116, 117. Plates or Sand Baths, 342. RuedorfE's, 342. Water Funnels, 214. or Steam Funnels, 214. Hour Glasses. See Sand Glasses. Howe's Balance, 41. Huefner's Ureometer, 394. Hydrogen Lamps, Doebereiner*s, 276. Hydrometer Jars. See Cylinders. Hydrometers, 261. Acid, Baume's Scale, 261. Alcohol, Gay-Lussac's, 261, 262. Richter's and Tralle's Scales, 262. U. S. Custom's House Standard, 262. Internal Revenue Standard, 262. Alkali, 262. Ammonia, 262. Bark (Tannometers), 262. Battery, 262. Baume's Scale, 261. Beer, Balling's, 262. and Wort, Kaiser's, 262. Benzine, 262. Chlorine, 262. Cider, 262. Coal Oil, 262. Ether, 262. Gasoline, 262. Glycerine, 262. Milk, 262. Naphtha, 262. Normal, 263, 264. Oil, 264. Salt Solution, 264. Silver Solution, 264. Specific Gravity, 264. and Baume's Scale, 265. Sugar, Balling's, 265. Brix', 265. and Syrup, 265. Twaddel's, 265, 266. 424 Bausch & Lomb Optical Co., Rochester. N. Y., U. S. A,, INDEX. Hydrometers, Vinegar, 266. Wine and Must, Oechsle's, 266. Hydrostatic Specific-Gravity Balance, Kohl- busch's, 46. Hygrometers, Daniell's, 266. Mason's, 266. Mithof s, 266. Hypodermic Syringes, 372. I. Ideal Fountain Pens, Genuine Waterman's, 311. Milk Testers, Babcock's, 297. Ignition Tubes, 391. Illuminating Burners, 117. See Lamps. Imperial Berlin Porcelain Beakers, 65. Casseroles, 121, 122. Combustion Boats, 136. Tubes, 140. Crucibles, 149, 150. Caldwell's, 149. Gooch's, 149. Roses', 150. Evaporating Dishes, 163, 164. Improved Automatic Cement Tester, 132. Crucible Furnace, Fletcher's, 221, 222. Form Viscosimeter, 309. Sumer Queen Kerosene Stoves, 361. Incubator Thermometers, 381, 382. Incubators and Sterilizers. See Bacterio- logical Catalogue. Induction Coils, Ruhmkorff's, 266. Ingot Moulds, 306. Bullion or, 306. Injecting Syringes, 373. Injector Furnaces, Fletcher's Perfected, 226, 227, 228. Ink, Diamond, 266. Higgins', 267. Inoculating Needles, 307. Insect Pins, Klaeger's, 312, Instantaneous Water Heater Burners, 118. Instruments, Dissecting, 167. in sets, 181. Iron Crucibles, 148. Cast, 148. Skidmore's, 149. Evaporating Dishes, 163. Ladles, Wrought, 274. Mortars, 301. Chilled, 301. Retorts, 337. Wire, 406. Gauze, 407. Iron, Soldering, and Scraper, 346. Self-Heating, 346. J. "Jackass*' Assay Furnace, 218, 219. Japanese Lens Paper, 284. Jars, Aquarium, 267. Battery, 60. Chlorid Calcium, or Cylinders, 128. Culture, Novy's, 267. Improved, 268. Cylinder, 268. Decanting, 268, 269. Embryo, 269. Hydrometer. See Cylinders. Nessler. See Colorimetric Determina- tion Apparatus. Percolator, 311. Precipitating, 269. Preparation, 269, Preservation, 269. (Lightning), 269. Screw Capped, 269. Specie, 270. Specimen, 270, 271. Staining, 353. Coplin's, 353. Naples, 353. Stone, 272. Jeffer's Counting Plate, 147. Jena Glass Beakers, 64, Boiling Flasks, 201, 202. Distilling Flasks, 205. Evaporating Dishes, 163. ^ Flasks, Erlenmeyer Form, 203. Kjeldahl's Flasks, 234. Retorts, 336. Volumetric Flasks, 209. Jewell Stills, 355. Johns Hopkin's Anatomical Dissecting Sets, 185. Histological Dissecting Sets, 185. Johnson's Flasks, 208. Gas Apparatus, 230. Joliet Flasks, 207. Jolly's Spiral Specific-Gravity Balance, 46. Jones' Excelsior Stills, with Condensers, 355, Junker's Calorimeter, 119. K. Kaiser's Beer and Wort Hydrometers, 262. Kekule's Gas Generators, 241. Kellogg's Gasoline Burners, 116, Kerosene Blast Lamp, 73. Crucible Furnaces, Fletcher's, 222. Polariscope Lamp, Kink's, 325. Stoves, Improved Summer Queen, 361. Kettles, Agateware, 272. Porcelain, 272. Kink's Kerosene Polariscope Lamp, 325. Kipp's Alkalimeter, 11. Gas Generators, 242. Kitasato's Autopsic Animal Holder, 12. Filters, 194. Kjeldahl's Condenser, 233, Connecting Bulb Tubes, 233. Digesting Shelf, 233, 234. Flasks, 234. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 425 INDEX. Kjeldahl's Flasks, Jena Glass, 234. Nitrometers, 236. Klaeger's Insect Pins, 312. Kleb's Moist Chambers, Recklinghausen's or, 298. Knives, Amalgam, 273. Battery, 60. Brain, 171. Cartilage, 171. Cork, 273. Potato, 273. Section, 173. Knop's Nitrometers, 236. Knop-Wagner's Nitrometers, 236. Koch's Culture Flasks, Erlenmeyer's, 204. Safety Burners, 1 18. Syringes, 374. Kohl's Specific-Gravity Bottles, 96. Kohlbusch's Analytical Balance, 25, 26, 27. Assay Balance, 34. Hydrostatic Specific-Gravity Balance, 46. Improved Analytical Balance, 24. Portable Assay Balance, 35. Kreuzler's Distilling Flasks, Baloc Glass, 206. Kyll's Potash Bulbs, Liebig-, 327. Winkler-, 328. Label Book, 274. Labels, Beakers with Ground, 65. Bottles with Ground, 86. Gummed, 273. Microscopical, 273. Laboratory Balance, 38, 40, 41. Improved, 38. Troemner's, 37. New, 45, Burners, 113. Fletcher's, 1 14. Filters, Berkefeld, 193. Medical or, 193. Shears, 344. Spectroscope, 349. Water Baths, 400, 401. Lactobutyrometer, Caldwell's, 296. Marchand's, 296. Lactometer, Board of Health, 296, New Design, 297. Quevenne's, 297. Lactoscope, Fesers, 297. Ladenburg's Distilling Flasks, Baloc Glass, 206. Ladle Furnaces, 224. Ladles, Agateware, 274. Melting, 274. Wrought Iron, 274. Laland's Battery, Edison-, 58. Lamp Wicking, 277. Lamps. See Burners, Blast Lamps, Stoves. Alcohol, 274, 275, 276. Blast, Alcohol, 68. Hoskin's, yz- Lamps, Blast, Kerosene, 73. Turner Gasoline, 74. Wiesnegg's, 74. Davy's Safety or Miners' 276. Doebereiner's Hydrogen, 276. Parting, 2y6. Polariscope, Electric, 325. Gas, 325. Kerosene, Kink's, 325. Welsbach, 276, 277. Lancet, Moore's Centrifuge Blood, 125. Large Model Spectroscope, 348. Latapie's Animal Holder, 13. Latest Pattern Combustion Furnace, Fuch's, 139- Laurent's Polariscope, 323, 324. Lead Dishes, 165. Shot, 277. Pipe, 312. Le Bell's Distilling Tubes, Henninger-, 389, 390. Le Chatelier's Thermo-Electric Pyrometers, 330. Leclanche Disque Battery, 59. Lecture Apparatus, Hoffman's, 277, 278, 279, 280, 281, 282, 283. Furnace, Fletcher's Experimental and, 224, 225. Ledebur's Sulphur Apparatus, 363. Leed's Color Comparator, 135. Diamond Mortars, 300. Lens Paper, Japanese, 284. Lenses, Demonstration, 283, 284. Magnifying. See Magnifiers, Micro- scopes, Readers. Photographic. See Catalogue of Pho- tographic Lenses.' Letters, 284. Steel Figures. See Figures. Levels, 285. Lever Cork Press, 143. Handle Air Pump, 8, 9. Liebig's Aspirator, 17. Condensers, 141, 1 42. Sulphurous Acid, 143. Drying Tubes, 188. Potash Bulbs, 327. Liebig-Dittmar's Potash Bulbs, 327. -Kyll's Potash Bulbs, 327. Lifters, Section, 178, 180. Lillie's Water Baths, 401. Oil Heaters for, 401. Lime Cylinders or Chalk Sticks, 127. Linen Testers, 289. Lintner's Pressure Bottles, 90. Listers' Culture Flasks, 204. Liter Flasks (or Volumetric Flasks), 208. Litmus Paper. See Test Paper. Pencils, Tyree's, 310. Lothar-Meyer's Combustion Furnace, 139. Lovibond's Patent Tintometer, 382. Low and High Temperature Burners, Fletch- er's, 115. 426 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., INDEX. Low Form Bell Glasses, 66. Temperature, Furnaces for. See Stoves. Lunge's Distilling Flasks, Baloc Glass, 206. Gas Apparatus, Orsat-, 230. Nitrometers, 236, 237. Weighing Bottles, 98. Lussac*s Alkalimeter, Gay-, 10. Burettes, Gay-, 104. Hydrometers, ^Mcohol, Gay-, 261, 262. Specific-Gravity Bottles, Gay-, 95. Supports, Gay-, 368. M. Mabon's Combination Water Baths, 402. Magnets, Bar, 285. Horseshoe, 2S5. Magnifiers, Achromatic Triplet, 286. Aplanatic Triplet, Hastings, 286. Coddington, 287. Doublet, 287. Pocket, 288, 289. See Microscopes^ Reading Glasses. Magnifying Lenses. See Magnifiers, Mi- croscopes, Readers. Reading Glasses, 330. Magnus Aspirator, 17. Mahler's Bomb Calorimeter, 120. ilallets, 289. Manganese Comparison Color Tube, 289. Manometers (Vacuum Gauges), 252. Bennert's, 252, 253. Claisen's, 253. Marchand's Chlorid Calcium Tubes, 129. Lactometer, 296. Marsh's Arsenic Apparatus, 15. Marshall's Urea Apparatus, 393. Mason's Hygrometers, 266. Mattrasses, 289. Measures, 290. Agateware, 289. Boxwood, 290. Caliper, 291. Folding, 290. Micrometer Screw, 290. Vernier, 290, 291. Copper, 289. Glass. See Graduates. Steel Rule, 391. Tape, 291. Tin, 290. Measuring Cones, 291. Tubes, Gas, 246. Meat Chopper, 129. Medical Filters, Berkefeld's Laboratory or, 193. Polariscopes, Standard, 324. Melting Ladles, 274. Point Apparatus, Roth's, 292. Tester, Standard, 309. Mercurial Air Pumps, 4. Mercury Troughs, 386. Mesco Dry Battery, 59. Meyer's Bulb Tubes. See Meyer's Sulphur Apparatus. Combustion Furnace, Lothar-, 139. Sulphur Apparatus, 363. Sulphurous Acid Condensers, 143. Funnels, \'ictor, 216. Vapor Density Apparatus, Victor, 395. Micro Burners, Bunsen's, iii. Micro-Chemical Balance, 39. Microscopes. See Catalogue of Micro- scopes and Accessories. Simple. See Magnifying Reading Glasses. Chamot Chemical, 292. Demonstration, 294. Dissecting, 295. Microscopical Coverglasses, 295. Labels, 273, 274. Object Slides, 296. Micrometer Screw Caliper Measures, 290. Microtomes. See Catalogue of Microtomes. Miescher's Haemacytometer, 258. Milk Hydrometers. See Milk Testing Ap paratus; Lactometer. Test Set, Holt, 296. Testers, Heeren's Pioscope, 298. "Agos," 297. Babcock's Ideal, 297. Testing Apparatus, 296. Tubes, Centrifuge, 126. Miller's Water Batlis, 402. Mills, 298. Assayers', 298. Miner's Cups, 154. Lamp, Davy's Safety or, 276. Mineralogical Hammers, Dana's, 260. Minim Glasses. See Graduates. Miquel's Aeroscope, 3. Culture Flasks, 204. Mirrors, 298. Special, 298. Mithof's Hygrometers, 266. Mitscherlich's Drying Tubes, 188. Eudiometers, 1 90. Gas Holders, 246. Polariscopes, Latest Model, 325. Potash Bulbs, 327. Mittens, Asbestos, 16. Mixing Bottles, 90. Cylinders, 156, 157. Jars. See Cylinders. Models, Anatomical, 12. Mohr's Alkalimeter, 11. Burettes, 104, 107, 108. Pinch Cock Tubing Clamps, 132. Pipettes, 313, 314. Standardized, 315. Potash Bulbs, 327. Specific-Gravity Balance, 47. Moist Chambers, 298. Geissler's, 298. Recklinghausen's or Kleb's, 298. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 427 INDEX. Molecular Weight Determination Apparatus. Apparatus for Beckmann's Boiling Point Method, New Form, 300. Apparatus for Beckmann's Boiling Point Method, Old Form, 299. Apparatus for Beckmann's Freezing Method, Latest Form, 299. Moore's Centrifuge Blood Lancet, 125. Staining Dishes, 352. Mortars, Agate, 300. Diamond, Leed's, 300. Plattner's, 300, Glass, 301. Iron, 301. Chilled, 301. Porcelain, 301, 302. Wedgewood, 302. Motors, Electric, Porter, 302, 303. Rochester, 303. Hot Air, 305. Rabe's, 304. Water, 304. Moulds, Cupel, 154. Ingot, 306. or Bullion, 306. Pouring, 306. Mounting Paper, Botanical, 82. Mueller's Ammonia Condensation Apparatus, II. Muencke's Air Pump, 4. Filters, 194. Gas Apparatus, Orsat-, 231. Generators, 243. Regulators, Improved, 250. Washing Bottles, 252. Tubes, 252- Muffle and Crucible Combination Furnaces, Hoskins', 225. Furnaces, 225. Hoskins* Latest Design, 225. Scraper, 307. Muffles, Battersea, 306, 307. Scheibler's Platinum, 319. Multiple Tubed Burners, Bunsen's, 112, Munktell's Swedish Filter Paper, 197, 198, 199. Must Hydrometers, Wine and, 266, N. Naples Staining Jars, 353. Water Baths, 404. Naphtha Hydrometers, 262. Narrow Mouth Bottles, 83. or Tincture Bottles, 84, 85. Reagent Bottles, 91, 92, 93. Needle Holders, 172. Needles, 172. Dissecting, 171, 172. Inoculating, 307. Nessler Jars. See Colorimetric Determin- ation Apparatus. Tube Supports, 368. Tubes, 136. Neubauer-Vogel's Urinometer, 394. New Design Lactometer, 297. Pattern Combustion Furnace, Fletcher's 138. Nichol's Prisms, 328. Nickel Crucibles, Pure, 149. Evaporating Dishes, Pure, 163. Spatulas, 347. Spoons, Pure, 351. Steel Funnels, Agate, 211. Wire, 406. Nitrogen Bulb, Arendt's, 235. Clemens-Winkler's, 235. French Form, 235. Fresenius', 23.5. Shepard's, 235. Stein-Schwarz, 235. Vollhard's, 235. Will-Varentrapp's, 235, 236. Determination, Gas Apparatus for, 233. Nitrometer Supports. See Supports. Nitrometers, Franke's, 236. Horn's, 236. Kjeldahrs, 236. Knop's, 236. Knop-Wagner's, 236. Lunge's, 236, 237. Schiif's, 237. Nivellating Apparatus, 307. Non-corrodible Burners, Chaddock's, 113. Norblad's Gas Apparatus, 243. Normal Hydrometers, 263, 264. School Gas Generators, Skidmore's, 243. Thermometers, 380. Note Book Covers, 307. Novy*s Cover Glass Forceps, 168, 169. Culture Jars, 267, 268. Improved, 268. Gas Regulator's, Reicheri-, 250. Numbers, Steel. See Figures. o. Object-Slides, Microscopical, 296. Oettel's Gas Apparatus (Fluorometer), 230. Oil Bottles, Cedar, 87. Apparatus, Bromwell's Fusel, 229. Herzfeld's Fusel, 229. Heaters for Lime's Water Baths, 401. Hydrometers, 264^ Coal, 262. Pyrometer, Tagliabue's Coal, 308. Soap, Palm, 170. Stove, 172. Vaporized, 362. Tester, Abel's, 307. Elliot's, 307. Open Fire Tester, 308. Cleveland, 308. Top Bell Glasses, 67. Narrow Neck, 66. Wide Neck, 67. Optical Pyrometer, 330. 428 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A. INDEX. Ore Crusher, 152. Orsat-Fisher's Gas Apparatus, 230. -Lunge's Gas Apparatus, 230. -Muencke's Gas Apparatus, 231. Ostwald's Universal Apparatus Clamp, 129- Otto's Acetometer, i. Ovens, Drying, Double Wall, 187, 188. Fresenius', 188. Rammelsberg's 188. Reeves' Water Baths and, 405. Royal Berlin Porcelain, 188. Single Wall, 186, 187. Oxyhydrogen Blowpipe, jt, 78. Pads, Asbestos, 16, 17. Pails, Agateware. See Buckets. Palladium Tubes, Hempel's, 247. Palm Oil Soap, 170. Palmquist's Gas Apparatus, Petterson's and, 231. Pans, Balance, 55. Dissecting, 172. Gold Washing, 255. Scale, and Scales. See Balances. Paper, Adams, for Absorbing Milk. See Milk Testing Apparatus. Asbestos, 17. Baker and Adamson's Filter, 197. Bibulous. See Filter Paper. Botanical Drying, 82. Mounting, 82. Pressing, 82. Emery, 189. Extraction. See Milk Testing Ap- paratus. Filter, 196, 200. Baker and Adamson's, 197. B. & L., 196, 197. Munktell's Swedish, 197, 198, 199. S. & S., 199, 200. Glazed, 310. Japanese Lens, 284. Litmus. See Test Paper. Note Book, 307. Parchment, 310. Sand, 342. Test, 374, 375. Tracing, 310. Paraffin Baths. See Water Baths. Candles, 120. Parchment Paper, 310. Parting Flasks. See Flasks, Assay. Lamps, 276. Paste Board Boxes, 99. Pasteur's Culture Tubes, 389. Culture Flasks, Chamberlain's or, 203. Dishes, 165. Pipette Culture Flasks, 204. Patent Standard Polariscopes, 322, 323. Triplex Burners, Bunsen's, 113. Pen Holder, 310. Pens, Crow-quill, 310. Lithographic, Gillott's, 310. Fountain, 311. Genuine Waterman Ideal, 311. Pencils, Drawing, 3 r o. Litmus, Tyree's, 310. Wax, 310. Petterson's Gas Apparatus, Palmquist and, 231. Pepy's Gas Holder, Berzelius-, 245. 246. Percentage Tubes, Centrifuge, 126. Percolator Jars, 311. Percolators, 311. Agateware, 311. Copper or Tin, 311. Perfected Injector Furnaces, Fletcher's, 226, 227, 228. Petri Dishes, 165, 166. Dish Holders, 166. Phillip's Beakers, 64, 65. Photographic Lenses, 2R4. Physicians' Filters, Berkef !d. 193. Haemaglobin Outfit, 259. Pipe, Block Tin, 312. Lead, 312. Pipes, 312. Pipettes, 312, 313. Acid, 313. Automatic, 313. Bleier's, 373, Bulb, 313. Centrifuge, 126. Gas, Etling's, 247. Hempel's, 247, 248. Graduated, 315. Mohr's, 313, 314- (Standardized) 315. Viscosity, 314, Dudley's, 309. Volumetric, 314. (Standardized) 315. Safely, 314. Pipette Bottles, 90. WoUyn's, 90. Box, 315. Culture Flasks, Pasteur's, 204. Rest, 315. Supports, 368. Pill Tiles, Porcelain. 312. Pinch Cocks. See Clamps. Pinch Cock Tubing Clamps, Mohr's, 132. Scheibler's, 132. Pinning Forceps, 312. Pins, Insect, Klaeger's, 312. Pioscope Milk Testers, Heeren's, 298. Pitchers, Acid, i Agateware, 315. Plaited Straw Rings, 362. Plant Press, Botanical Portable, 82. Plate and Rubber. See Crusher. Bench, Culture, 153. Box, Culture, 1 53. Burners, Hot, 116, 117. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 429 INDEX. Plates, Air Pump, 9. Arsenic, 15. Carbon, for Batteries. See Batteries. Cork, 145. Counting, Jeffer's, 147. Culture, 153. Desiccator, 161. Drying, 188. Glass, Blue, 316. Circular, 316. Heavy Plate, 316. Ruby, 316. Square, 316. Hot. See Burners, Hot Plate. or Sand Baths, 342. Ruedorff's, 342. or Blocks, Suberite, 362. Porcelain, 316, 317. Porous, 317. Streak, 317, Plattner's Blowpipe, 78. Furnace, Fletcher-, 78, 79. Hammers, 261. Diamond Mortars, 300, Platinum Blowpipe Tips, 317. Combustion Boats, 3 1 7. Tubes, 317. Crucibles, 317. Gooch Form, 317, 318. See Combustion Apparatus, Shim- er's. Dishes, 318. Evaporating, 318. Filter Cones, 318. Filtering Apparatus, 319. Foil, 319. Gauze, 319. Muffle, Scheibler's, 319, Spatulas, 319. Sponges, 319. Spoons, 319. Tipped Crucible Tongs, 319, 320. Blair's, 320. Forceps, 320. Triangles, 321. Wire, 321. Holder, 321. Pliers, 321, 322. Button, 322. PI umbago Crucible Covers, Dixon's Black Lead or, 147. Crucibles, Dixon's Black Lead or, 147. Plunge Battery, 59. Pneumatic Troughs, 386. Bunsen's, 387. Pocket Assay Balance, 36, Magnifiers, 288. (Linen Testers), 289. Polariscope Control Tubes, 323. Polariscope Control Tubes, 323. Lamp, Kink's Kerosene, 325. Electric, 325. Gas, 325. Polariscope Tubes, 326, 327. Polariscope, Laurent's, 323, 324, Mitscherlich's Latest Model, 325, Schmidt and Haensch, 324. Standard Medical, 324. Patent, 322, 323. Precipitating Flasks. See Beakers, Phillip's, Jars, 269. Preparation Dishes, 166. Jars, 269. Prescription Balance, Specific Gravity and, 48. Preservation Jars, 269. CT,ightning) Jars, 269. Presses, Cork, Lever, 145. Rotary, 145. Plant, Botanical Portable, 82. Tincture, 328. Pressing Paper, Botanical, 82. Pressure Air Pumps, 6. \'acuum and, 7. Bottles, 90. Lintner's, 90. Regulators, Gas, 25 1. Prisms. Equilateral, 328. Nicol's. 328. I'orcelain Beakers, Imperial Berlin, 65. Capsules, Royal Meissen, 121. Casseroles, Imperial Berlin, 121, 122. Royal Berlin, 122. Combustion Boats, Imperial Berlin, 136. Royal Meissen, 136. Tubes, Imperial Berlin, 140. Royal Berlin, 141. Crucibles, Berlin, Imperial, 149, 150. Caldwell's, 149, Royal, 150. Gooch's, 150. Royal Meissen, 150. Caldwell's, 150. Drying Ovens, Royal Berlin, 188. Evaporating Dishes, Imperial Berlin, 163, 164. Royal Berlin, 164, 165, Funnels, 213. Buchner's, 213. Hirsch's, 213. Kettles, 272. Mortars, 30 1, 302. Pill Tiles, 312. , Plates, 316, 317. Spatulas, 347. with Spoon End. See Spoons. Spoons, 352. Staining Dishes, 353. Trays, 384. Porous Cells or Cups, 327. Plates, 317. Portable Electric Stoves, 360. Plant Press, Botanical, 82. Saccharo meter, Zeiss, 341. Porter Electric Motors, 302, 303. Posts, Battery Binding, 60. 430 Bausch & Lomb Optical Co., Rochester. N. Y.. U. S. A., INDEX. Pots, Acid, I. Potash Bulbs, 327. Liebig's, 327. Liebig-Dittmar's, 2-7- Kyll's, 327. MitSclierlich's, 327. Mohr's, 327. Winkler's, 327. Winkler-Kyll's, 327. Potato Cutter, 328. Knives, 273. Pouring Moulds, 306. Powder, Asbestos. See Chemical List. Glass. See Chemical Catalogue. Power Blowers, Fletcher's Foot, 75, Centrifuge, Water, 126. Prisms, Rectangular, 328. Probangs. See Brushes, Test Tube. Pravaz' Syringes, 374. Psychrometer, August's. 329. Pukal's Filters, 195. Pulf rich's Refractoraeters, 335. Pulse Glasses, 329. Pump Plates, Air, 9. Pumps, 329. Acid, 2. Air, s, 7. Arzberger-Zulkowsky's, 3, 4. Chapman's, 4. Couplings for, 4. Compressed Air and \'acuum, 7. Fisher's, 4. Geissler's, 4. Lever Handle, 8, 9. Mercurial, 4. Muencke's, 4. Pressure, 6. Richard's, 4, 5. Couplings for, 5. Rotary, 9. Vacuum and Pressure, 7. Filter. See Air Pumps. Pure Nickel Crucibles, 149. Spoons, 351. Pyrometers, 330. for Oil Testing. See Oil Testing Ap- paratus. Optical, 330. Tagliabue's Coal Oil, 308. Thermo-Electric, Le Chatelier's, 330. Quevenne's Lactometer, 297. R. Rabe's Motors, 304. Shaking Apparatus, 344. Racks, Filter, 200. Test Tube. See Supports. Radial Burners, Fletcher's, 115. Rafter's Counting Apparatus, 146. Rake, Cupel, 154. Ralston Stills, 356. Rammelsberg's Drying Ovens, 188. Razors, Robb's Aseptic, 173. Section, 173. Reading Glasses, Magnifying, 330. Reducing, 331. Reagent Bottles, Narrow Mouth, 91, 92, 93. Wide !Mouth, gs, 94. Case, 331. Cylinders. 157. Stands, 332. Stock Bottles, 94. Reagents. See Catalogue of Chemicals AND Reagents. Receivers, 332, 333. for Air Pumps. See Bell Glasses. Bruehl's, 332. Recklinghausen's Moist Chamber, Kleb's or, 298. Rectangular Prisms, 328. Red Sable Brushes, 102, Reducing Reading Glasses, 331. Reduction Tubes. See Arsenic Tubes and Tubes. Reductor, 333. Redwood's \'i'^cosimeler, Boverton, 309. Reeves' Water Baths and Drying Ovens, 405. Refractometer, Abbe's, 333, 334. for Butter Examination, Zeiss, 334, 335. Pulfrich's, 335. Regnault's Specific Gravity Bottles, 96. Regulators, Gas, 249. Bimetallic, Roux', 251 . Dunham's, 249, 250. Muencke's Improved, 250. Pressure, 251. Reichert's, 250. Reichert-Novy's, 250. Soxhlet's, 251. Reich's Gas Apparatus, 232. Reichert's Gas Regulators, 250. Reichert-Novy's Gas Regulators, 250. Reinhardt's Desiccators, 160. Respirator, Automatic, 335. Rests, Pipette, 315. Hand, Folding, Wooden, 295. Retorts, Baloc Glass, 336. Copper, 336. Glass, Baloc, 336. Jejia. 336, Iron, 337. Skidmore's. See Crucibles, Skidmore's. Richard's Air Pump, 4, 5. Couplings for, 5. Richter's and Tralle's Scales Hydrometers, 262. Riders, 55. Rings, Concentric, 337, Filter, 200. Plaited Straw, 362. Straw. See Suberite Rings, Suberite, 362. Support, 33S. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 431 INDEX. Ring Form Burners, Bunsen's, 113. Roasting Dishes, 338. Robb's Aseptic Razors, 173. Robervahl's Balance, 42. Rochester Electric Motors, 303. Rods, Glass, 254. Rohrbeck's Alkalimeter, 11. Rose*s Crucibles, Imperial Berlin Porcelain, ISO. Roszahegzi's Culture Flasks, 204, 205. Rotary Air Pump, 9. Cork Press, 145. Roth's Melting Point Apparatus, 292. Round Files, 193. Roux' Bimetallic Gas Regulators, 251. Culture Tubes, 389. Royal Berlin Porcelain Casseroles, 122. Combustion Tubes, 146. Crucibles, 150. Gooch's, 150. Drying Ovens, 188. Evaporating Dishes, 164, 165. Meissen Porcelain Capsules, 121. Combustion Boats, 136. Crucibles, 150. Caldwell's, 150. Evaporating Dishes, 115. Rubber Bags. See Gas Bags. Bands, 338. Bulbs, 338, 339. Caps, 339. Cloth, 339. Fingers, 339. Funnels, 213. Stamps, 353. Stoppers, 339. Tissue, 339. Trays, Genuine Hard, 384. Standard Hard, 385. Tubing, 340, 341. Cloth Impression, 341 , Pressure, 341. Washers, 136. Rubber, Plate and. See Crusher. Sponge, 350. Ruby Glass Plates, 316. Rudorff's Gas Apparatus, 232. Ruedorff's Hot Plates or Sand Baths, 342. Ruhmkorff's Induction Coil, 266. Rule Measures, Steel, 291. Rules. See Measures. Rupert's Drops, 341. Russian Sable Brushes, 102. s. S. & S. Filter Paper, 199, 200. Sable Brushes, Red, 102. Russian, 102. . Saccharometers, 392. Einhorn's Fermentation, 392. Einhorn-Fiebig's, 392. Zeiss' Portable, 341. Saccharometers. See Hydrometers, Polaris- copes, Color Comparators and Urinary Apparatus. Safety Burners, Koch's, 118. Friedburg's, 116. or Miner's Lamp, Davy's, 276. Pipettes, Volumetric, 314* Tubes. See Funnel Tubes. Salt or Wide Mouth Bottles, 85, S6. Solution Hydrometers, 264. Sample Bottles for Oils. See Bottles. Tubes. See Vials. Sampling Apparatus, Water, Esmarch's, 405. Sand Baths, 341. or Hot Plates, 342. Ruedorff's, 342. for Cleaning Platinum Vessels, etc. See Sea Sand. Crucibles, Hessian, 148. Glasses, 342. Paper, 342. Sartorius' Analytical Balance, 27, 28, 29, 30. Hydrostatic Specific Gravity Balaoice, 47. Sauveur and Whiting's Electric Furnace, 223. Saw, Bone, 174. Scale Pans. See Balance Pans. Scalpels, 174. Dissecting,. 175, 176. Scheibler's Desiccators, 160. Gas Washing Tubes, 252. Pinch Cock Tubing Clamps, 132. Schelenz' Albuminometer, Esbach, 392. Schellbach's Burettes, 105, 106. Supports, 368. Schiff's Nitrometers, 237. Schilling's Gas Apparatus, 232. Schmidt and Haench Polariscopes, 324. Schonjahn's Germinatinjg Apparatus, 253. Schroedter's Alkalimeter, 11. Schultz' Desiccators, Fruhling and, 159. Dehydrating Apparatus, 158. Schulze's Burette Floats, 109. Schumann's Specific Gravity Bottles, 96. Schwartz' Chlorid Calcium Tubes, 129. Nitrogen Bulbs, Stein-, 235. Scissors, Dissecting, 177, 178. Scoops, Agateware, 343. Horn, 343. Scorifiers, 343. Battersea, 343. Tongs, 384. Scott's Viscosimeter, 309. Scraper, Soldering Iron and, 346. Muffle, 307. Screw Caliper Measures, Micrometer, 290. Capped Jars, 269. Cork, J 45, Self-Pulling, 145. Scrubbing Brushes, 102. Sea Sand, 343. Sealing Wax, 403, 406. Section Knives, 173. Lifters, 178, 179. 432 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A., INDEX. Section Razors, 173. Sedgwick-Tucker's Aeroscope, 3. Sedimentation Glasses, 392, 393. Large Size. See Test Glasses. Spaeth's, 393. Tubes, Centrifuge, 126. Sedlaczek's Syphon, 372. Seekers, 180. Self-Heating Soldering Iron, 346. Pulling Cork Screw, 145. Separatory Funnels, 214, 215. Squibb's, 215. Walter's Dropping or, 216. Sets, Dissecting, 181, 182, 183, 184. Anatomical, Johns Hopkins', 185. Botanical, 184. Histological, Johns Hopkins', 185. University, Johns Hopkins', 185. Dissecting Instruments in, 181. Milk Test, Holt, 296. Shades, Glass. See Bell Glasses. Shaking Apparatus, 343. , Rabe's, 344. Sharpener, Cork Borer, 145. Shears, Brown's, 344. Cartilage, 180. Cloth, 344. Laboratory, 344. Tinner's, 344. Shelf, Kjeldahl's Digesting, 233, 234. Shells, Diffusion, Schleicher and Schull's, 162. Shepard's Nitrogen Bulbs, 235. Shield Tubes, Centrifuge, 126. Shimer's Combustion Apparatus, 136. Shot, Lead, 277. Shovel, Cupel, 154. Sieves, 345. Silver Crucibles, 150. Dishes, German, 165. Evaporating Dishes, 165. Solution Hydrometers,, 264. Wire, German, 406. Simple Microscopes. See Magnifiers, Read- ing Glasses. Water Baths, 405. Single Speed Centrifuge, 124. Wall Drying Ovens, 186, 187. Skidmore's Battery, 59. Iron Crucibles, 149. Normal School Gas Generators, 243. Retorts. See Skidmore's Crucibles. Skin, Chamois, 127. Goldbeaters, 255. Slide Boxes, 100. Slides, Culture, 153. Microscopical Object, 296. Small Model Spectroscope, 349. Soap, Palm Oil, 170. Sodium Spoons. See Deflagration Spoons. Soil Borer, Fraenkel's, 345. Soldering Iron and Scraper, 346. Heater, 346. Self-Heating, 346. Solid Flame Burners, Fletcher's, 115. Soxhlet's Condensers, 143. Extraction Apparatus, 191. Fat Determination Apparatus. See Ex- traction Apparatus. Gas Regulators, 251. Spaeth's Sedimentation Glasses, 393. Spatulas, Aluminum, 346. Bone, 346. with Spoon End. See Spoons. Glass, 346. Horn, 346. with Spoon End. See Spoons. Nickel, 347. Platinum, 319. Porcelain, 347. with Spoon End. See Spoons. Steel, 347. Special IMirrors, 298. Specie Jars, 270. Specific Gravity and Baume's Scale Hydro- meters, 265. and Prescription Balance, 48. Balance, Hydrostatic, Kohlbusch's, 46. Sartorius', 47. Jolly's Spiral, 46. Mohr's, 47. Westphal's, 48. Bottles, American Form, 95. Gay-Lussac's, 95. Hogarth's, 96. Kohl's, 96. Regnault's, 96. Schumann's, 96. Sprengel's, 96. Squibb's, 96. Hydrometers, 264. Specimen Bottles. See Jars and Vials. Jars, 270, 271. Tubes. See Bottles and Vials. Spectrometer and Goniometer Combined, 347. 348. Spectroscopes, Direct Vision, 350. for Laboratory Work, 349, 350. Large Model, 348. Small Model, 349. Spectroscopic Cells, 350. Speed Centrifuge, Double, 124. Single, 124. Spherometers, 350. Spiral Condensers, 143. Sponge Rubber, 350. Sponges, 350. Platinum, 319. Spoons, Bone, 35 1. Combustion. See Deflagration Spoons. Deflagration, 157, 158. Glass, 351. Horn, 3^1. Nickel, Pure, 351. Platinum, 319. Porcelain, 352. Sodium. See Deflagration Spoons. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 433 INDEX. Sprengel's Specific Gravity Bottles, 96. Spring Gauges, 252. Springs, Watch, 398. ■ Sputum Tubes, Centrifuge, 126. Squibb's Separatory Funnels, 215, Specific Gravity Bottles, 96. Urea Apparatus, 393. Urinometers, 395. Staining Dishes, 166, 352. See Watch Glasses. Moore's, 352. Porcelain, 353. Steinach's, 352, Jars, 353. Coplin's, 353. Naples, 353. Stamps, Rubber, 353. Steel. See Figures and Letters. Standard Calorimeter, 119, 120. Candles, 120. Chemical Thermometers, 380. Medical Polariscopes, 324. Melting Point Tester, 309. Polariscopes, 322, 323. Stands. See Supports. Reagent, 332. Stanner's Color Comparator, 135. Star Burners, Fletcher's, 115. Steam Funnels, Hot Water or, 214. Steel Cylinders. See Gas Holders. Funnels, Agate Nickel, 211. Numbers. See Figures. Rule Measures, 291. Spatulas, 347. Stamps. See Figures and Letters. Steenbuch's Gas Generators, 244. Stein-Schwarz' Dishes, 352. Steinach's Staining Dishes, 352. Stende.r Dishes, 166, 167. Sterilizers and Incubators. See Bacteriolog- ical Catalogue. Sternberg's Culture Flasks, 205. Stewart's Cover Glass I-'orceps, i6g. Sticks, Chalk, or Lime Cylinders, 127, Charcoal, 127. Stills. 353, 356- Automatic Water, 354. Domestic Water, 354. Jewell, 355. Jones' Excelsior, with Condenser, 355. Ralston, 356. Stirrers, Glass, 254. Stirring Apparatus, 356. Rabe's, 356, 357. Stock Bottle, Reagent, 94. Stoddard's Test Tube Clamps, 131. Stoke's Color Comparator, 136. Stone Jars, 272. Stones, Oil, 172. Stoneware Articles. See Articles. Stop Cocks, Brass, 357, 358. for Gas Bags. See Gas Bags. Glass, 358, 359. Stop Cocks, Glass, Geissler's, 358, 359, Watch, 310. Stoppers, Caoutchouc. See Rubber Stoppers. Rubber, 339. Stoves, Alcohol, 360. Electric, Portable, 360. Gas, 360, 361. High Form, 360. Low Form, 361. Kerosene, Improved Summer Queen, 361. Vaporized Oil, 362. Strainers. See Colanders and Funnels, Straus-Wurtz's Aeroscope, 3. Straw Rings, See Suberite Rings. Plaited, 362. Streak Plates, 317. Strops, 180. Suberite Plates or Blocks, 362. Rings, 362. ' Sugar and Syrup Hydrometers, 265. Hydrometers, Balling's, 265. Brix', 265. Sulphur Apparatus, Dudley's, 362. Ledebur's, 363. Wiborgh's, 363. Sulphurous Acid Condensers, 143. Goebel's, 143. Liebig's, 143. Meyer's, 143. Summer Queen Kerosene Stoves, Improved, 361. Support Adapter, 371. Rings, 338. Tables, 371. Supports, 368, 369, 370. Apparatus, 363, 364. Bunsen's Universal, 364. Bottle, Weighing, 98. Burette, 364, 365. Chaddock's, 365. Hofrnann's, 365. Carbon Tube, 134. Chlorid Calcium Glass, 128. Condenser, 366. Bunsen's, 366. Hofrnann's, 366. Curtiss' Patent Standards or, 370. Desiccator, 161. Electrolytical, 366. Funnel, 367, 368. Gay-Lussac's, 368. Nessler Tube, 368. Pipette, 368. Schellbach's, 368. Test Tube, 369. Swedish Filter Paper, Munktell's, 197, 19S, 199. Swelled Form Bell Glasses. 68. Swimming Cups, 371. Syphons, 371, 372. Sedlaczek's, 372. Syracuse Solid Watch Glasses, 397. Syringes, Hypodermic, ^yz. 434 Bausch & Lomb Optical Co., Rochester, N. Y., U. S. A. INDEX. Syringes, Injecting, 372, 373. Koch's, 374. Pravaz', 374. Syrup Hydrometers, Sugar and, 265. Tables, Embedding, 189. Support, 371. Warming, 396. Tacks, Thumb, 382. Tagliabue's Coal Oil Pyrometer, 308. Tallquist's Haemagobin Scale, 259. Tape, Adhesive, Botanical, 82. Measures, 291. Tauber's Drying Apparatus, 186. Tenaculum, 181. Test Glasses, 374. See Urinary Apparatus : Sedimen- tation Glasses. Papers, 374, 375. Tubes, 375, 376. Graduated, ^yS. of Hard Bohemian Glass. See Ig- nition Tubes. Set, Milk, Holt, 296. Tube Baskets, 376. Burners, iig. Brushes, 102. Clamps, 131, Stoddard's, 131. Cleaners, 377. Filling Attachment, 377. Holders. See Clamps and Supports. Racks. See Supports. Supports, 369, 370. Testers, Cement, Automatic, Improved, 122. Gilmore's Needles, 123. Sampler for, 123. \'^icat's, 123. Fire, Elliot's, 307. Foster's, 308. Open, 308. Cleveland, 308. Linen, 289. Melting Point, Standard, 309. Milk, "Agos," 297. Babcock's Ideal, 297. Pioscope, Heeren's, 29S. Oil, Abel's, 307. Testing, Cement, Sieves for. See Sieves. Specific Gravity Bottles for. See Bottles. Thermo-Electric Pyrometer, Le Chatelier's, 330. Regulators. See Gas Regulators. Thermometer Tubes, 382. Thermometers, 382. Anchuetz', 380. Beekmann's, 381. Chemical, 377, 378, 379, 380, 381. Standard, 379, 380. Thermometers, Dairy, 381. Earth, 381. for High Temperatures. Sec Pyrometer:?- Incubator, 381, 382. Normal, 380. Tree, 382. Thimbles, Extraction, 1 92. Thoma-Zeiss Haemacytometer, 257. Thomas' Dehydrating Apparatus, 158. Thorn's Extraction Apparatus, 191. Thumb Tacks, 382. Tieftrunk's Gas Apparatus, 232. Tiles. 382. Pill, Porcelain, 312. Tin Boxes, 100. Foil, 382. Funnels, 213. Measures, 290. Percolators, Copper, 311. Pipe, Block, 312. Tincture or Narrow Mouth Bottles, 84, 85. Presses, 328. Tinner's Shears, 344. Tintometers, Lovibond's Patent, 382. Tips, Burner, 119. Burette, 104. Platinum Blowpipe, 317. Tipped Crucible Tongs, Platinum, 319, 320. Blair's, 320. Forceps, Platinum, 320, Tissue, Rubber, 339. Ton Weights, Assay, 53. Tongs, Cork, 146. Crucible, 382, 383. Platinum Tipped, 319, 320, Cupel, 384. Scorifier, 384. Torry and Eaton's Cupels, 154. Torsion Balance, 43. Laboratory, 43. Micro-Chemical, 43. Tracing Paper, 310. Tralle's Scales Hydrometers, Richter's and, 262. Trays, Agateware, 384. Cupel, 154. Glass, 384. Hard Rubber, Genuine, 384. Standard, 385. Porcelain, 384. Tree Thermometers, 382. Triangles, 385. Platinum, 321. Triangular Files, 193. Trip Balance, Harvard, 41. Troemner's, 45. Triplet Magnifiers, Achromatic, 2S6. Aplanatic, Hastings', 286. Triplex Burners, Bunsen's Patent, 113. Tripods, 385, 386. Burner, 119. Troemner's Analytical Balance, 30, 31, 32, 33. Assay Balance, 35, 36. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 435 INDEX. Troetnner's Avoirdupois Weights, 54. Balance, 45. Laboratory Balance, 37, 44. New Agate Balance, 44. Dispensing Balance, 46. Laboratory Balance, 45. Prescription Balance, 44. Troughs, Glass, 386. Mercury, 386. Pneumatic, 386. Bunsen's, 387. Troy Cup Weights, 55. Weights, 54, 55. Tube Attachment, Centrifuge Four, 125. Brushes, 103. Test, 102. Burner, 119. Test, 119. Clamps, Test, 131. Stoddard's, 131. Filling Attachment, Test, 377. Form Vials, 396. Supports, Carbon, 134. Nessler, 368. Test, 369, 370. Tubes, Absorption, Babo's, 387. Bunsen's, 387. Emmerling's, 387. Arsenic, 15. Barometer, 57. Bulb. See Tubes, Ignition. Meyer's. See Sulphur Apparatus. Carbon, 134 . Filter, 134. Centrifuge Milk, 126. Percentage, 1 26. Sedimentation, 126. Shield, 126. Sputum, 126. Chlorid Calcium, 128, 129. Marchand's, 129. Schwartz', 129. Vollhard's, 129. Woehler's, 129. Collecting, Gas, 240. Cooper's, 240. Combustion, 140. Imperial Berlin Porcelain, 140. Royal Berlin Porcelain, 141. Comparison. See Colorimetric Deter- mination Apparatus. Comparison Color, Manganese, 289. Condenser, 144. Connecting, 388. Culture, 389. Chamberlain's, 389. Gayon's, 389. Gayon-Dupetit's, 389. Pasteur's, 389. Roux', 389. Dissolving, 136. Distilling, 389. Glinsky's, 389. Tubes, Distilling, Henninger-Le Bell's, 389. 390. Hopkins', 390. Drying. See Chlorid Calcium Tubes. Liebig's, 188. Mitscherlich's, 1 88. Ether, 390. Fermentation, 192, 392. Filter, 194, 390. Carbon, 134. Fresenius', 390. Funnel, 216, 217. Babo's, 217. Vogel's, 217. Welter's, 217. Gas Washing, Muencke's, 252. Scheibler's, 252. Gauge, 253. Ignition, 391. Measuring, Gas, 246. Nessler, 136. Palladium, Gas, Hempel's, 247. Platinum Combustion, 317. Polariscope, 326, 327. Control, 323. Reduction. See Arsenic Tubes and Tubes. Safety. See Funnel Tubes. Sample. See Vials. Specimen. See Bottles and Vials. Test, 375, 376. Graduated, 376. of Hard Bohemian Glass. See Tubes, Ignition. Water Analysis, 391. Weighing. See Bottles, Weighing. Tubing Clamps, 132. Bunsen's, 132. Hoffman's, 132. Mohr's Pinch Cock, 132. Scheibler's Pinch Cock, 132. Tubing, Dialyzer, 161. Glass, 254. Barometer, 254. Capillary, 254. Combustion, 254. Rubber, 340, 341. Cloth Impression, 341. Pressure, 341. Tucker's Aeroscope, Sedgwick-, 3. Tumblers, 391. Turned Wood Boxes, 100. Turner Gasoline Blast Lamps, 74. Turner's Double- Jet, Alcohol Blast Lamps, 69. Twaddel's Hydrometers, 265, 266. Tweezers. See Forceps. Twitchell's Acidimeter, ^. Tyree's Litmus Pencils, 310. Tyrell's Burners, 116. 436 Bausch &■ Lomb Optical Co., Rochester, N. Y., U. S. A., INDEX. U. W- U. S. Customs House Standard Alcohol Hy- drometers, 262. Internal Revenue Standard Alcohol Hy- drometers, 262. Universal Apparatus Clamp, 130. Ostwald's, 129. Support, Bunsen's, 364. Ure's Alkalimeter, 11. Eudiometers, 191. Urea Apparatus, Marshall's, 393. Squibb's. 393. Ureometer, Doremus', 394. Doremus-Hind'p, 394. Huefner's, 394. Urine Cylinder, 394. Urinometer, Neubauer-Vogel's, 394. Sqiaibbs', 395. V. Vacuum Air Pump, Compressed Air and, 7. and Pressure Air Pump, 7. Desiccators, 160. Gauges (Manometers), 252. Bennerts*, 252, 253. Claisen's, 253. Vapor Density Apparatus, A'ictor Meyer's, 395. Vaporized Oil Stoves, 362, Varentrapp's Nitrogen Bulbs, Will-, 235, 236. Vasculum, Botanical, or Collecting Case, 82. Vaughan's Animal Holder, 13. Vernier Caliper ^Measures, 290, 291. Vials, 396. Glass Stoppered, 395. Homeopathic, 396. Tube Form, 396. Victor Meyer's Vapor Density Apparatus, 395. Funnels, 216. Vinegar Hydrometers, 266. Viscosimeter, Boverton Redwood's, 309. Improved Form. 309. Scott's, 309. Viscosity Pipette, Dudley's, 309. ^''ises, Anvils with, 14, Vogel's Diaphanoscope, 161, Funnel Tubes, 217. Urinometers, Neubauer-, 394. Voges' Animal Holder, 13. Vollhard's Nitrogen Bulbs, 235. Volumetric Flasks, 209, 210. Giles', 210. Jena Glass, 209. Kohlrausch's, 210. or Liter Flasks, 208. Pipettes, 314. Safety, 314. Standardized, 315. Wagner's Nitrometers, Knop-, 236. Wait's Gas Generators, New, 244. Walter's Separatory or Dropping Funnels, 216. Warming Tables, 396. Washers, Rubber, 136. Washing Apparatus, Glazer's Drying and, 186. Washing Bottles, 97. Faraday's, f^j. fitted with Handles, 97. Gas, Allihn's 251. Bunsen's, 251. Drechsel's, 251. Muencke's, 252. Horns, Gold, 255. Pans, Gold, 255. Tubes, Gas, Muencke's, 252. Scheibler's, 252. Watch Glasses, 397. Balance, 55. Embryological, 397. Syracuse Solid, 397. Glass Clamps, 132, 133. Bunsen's, 133. Springs, 398. Watch, Stop, 310. Water Analysis Tubes, 391. Water Baths, 398, 399, 400. Agateware, 398. Griffin's, 399. Laboratory, 400, 401. Lillie's, 401. Oil Heater for, 401. Mabon's Combination, 402. Miller's, 402, 403. Naples, 404. Simple, 405. and Drying Ovens, Reeves,* 405. Decomposition Apparatus. See Lecture Apparatus. Hammers, 405. Heater Burners, Instantaneous, 118. Heaters. See Burners. Motors, 304. , Power Centrifuge, 126. Sampling Apparatus, Esmarch's, 405. Stills, Automatic, 354. Domestic, 354. Waterman's Ideal Fountain Pens, Genuine, 311. Wax, Bees, 405. Sealing, 405, 406. Pencils, 310. Weatherhead's Crusher, 1 52. Wedgewood Mortars, 302. Weighing Bottles, 98. Grethen's, 98. Lunge's, 98. Support for, 98. Tubes. See Bottles^ Weighing. New York, Boston, Chicago, U. S. A., Frankfurt a/M., Germany. 437 INDEX. Weight Determination Apparatus, Molecular. Apparatus for Beckmann's Boiling Point Method, Latest Form, 300. Old Form, 399. for Beckmann's Freezing Method, New Form, 299. Weights, Assay Ton, 53. Avoirdupois, 53, 54. Troemner's, 54. B. & L. Analytical Gram, 49. Gram, 50. Single Analytical Gram, 50. Grain, Troemner's, 54. Gram, 50, 51, 52, 53. Single Gram, 51, 52. Troemner's Metric Gram, 53, Troy, 54, 55. Troy Cup, 55. Wellsbach Lamps, 276, z-jt. Welter's Funnel Tubes, 217. Westpbal's Specific Gravity Balance, 48. \^'iborgh's Sulphur Apparatus, 363. Wicking, Lamp, zj-j. Wide Mouth Bottles, 83. or Salt Bottles, 85, 86. Reagent Bottles, 93, 94. Wiesnegg's Blast Lamp, 74. Wiley's Extraction Apparatus, 191. Will's Alkalimeter, Fresenius-, 1 0. Will-Varentrapp's Nitrogen Bulbs, 235, 236. Wine and Must Hydrometers, 266. Winkler's Gas Apparatus, z-^z. Burettes, Hempel-, 239. Nitrogen Bulbs, Clemens-, 235. Winkler's Potash Bulbs, 327. Winkler-Kyll's Potash Bulbs, 327. Wire, Aluminum, 406. Brass, 406. Copper, 406. German Silver, 406. Iron, 406. Nickel, 406. Platinum, 321. Wire Gauges, 253. Gauze, Brass, 406. Copper, 406. Iron, 407. Holder, Platinum, 321. Woehler's Condensers, 144. Wolffhuegel's Counting Apparatus, 146. Wollyn's Pipette Bottles, 90. Wood Boxes, Turned, 100. Wooden Hand Rests, Folding, 295. Wool, Asbestos. See Chemical List. Glass, 254. Wort Hydrometers, Kaiser's Beer and, 262. Woulff Bottles, 99, Wrought Iron Ladles, 274. Wurtz's Aeroscope, Straus-, 3. z. Zeiss Haemacytometer, Thoma-, 257. Portable Saccharometer, 341. Refractometer for Butter Examination, 334. 335- Zero Burettes, Automatic, 106. Zulkowsky's Air Pump, Arzberger, 3, 4. Bausch & Lomb Optical Co., Rochester, N. Y.. U. S. A.