: PATENTED CLEVELAND) OHIO; USA. HULU | ULTEALEERTELUILLEELELLLAEELELLETELEERLACEEER EGULLET LEU HEEAEEL EOLA LIPLAEEEELEE TELE | | NEHA LL {= IVHELUTULHLLTEULEELUELLTEEREUULELEELETERTELAEeLTCLALELEE LTE EAREE SESE LTEEAERLEEL AU ELA ESTA UIUIMIM ELLE LURI ULL LEER EE SIMIAN TTTTTT WARNING LL materials for waterproofing concrete or mortar, in powder or paste form, consisting essentially of fatty acids combined with calcareous bases, unless manufactured under our license, are INFRINGEMENTS OF OUR BASIC PATENTS. All such in- fringements will be vigorously prosecuted. All makers and users of concrete waterproofing materials are cautioned that the sale or use of waterproofing material, unless bearing the Medusa trade mark or the words “licensed under the Newberry patent No. 851247” may render them liable to suit for infringement. MEDUSA CONCRETE WATERPROOFING CO. a os Medusa Waterprcofing Patent Sustained In the United States District Court, Northern District of Illinois, on February 18, 1914, a decree was entered declaring the Newberry patent, No. 851247, to be good and valid, and that the McCormick Waterproof Portland Cement Company and 8. T. Sjoberg in- fringed said patent and are perpetually enjoined from making or selling waterproof cement or carrying on the process described in said patent, and that the complainant shall recover the damages resulting from said infringement. The United States Court of Appeals, Seventh Circuit, rendered a decision on January 4, 1915, fully affirming the decision of the United States District Court, Northern District of Illinois. A copy of the decree, in pamphlet form, will be sent on application. El THE MEDUSA CONCRETE WATERPROOFING COMPANY, a subsidiary of THE SANDUSKY CEMENT COMPANY, has suits pending against the following comranies for infringement of the MEDUSA WATERPROOFING PATENT: Ceresit Waterproofing Co., Theodore F. Koch & Frank A. Mitchell, in the U. S. District Court, Seventh Circuit, North- ern District of Illinois, Eastern Division. Integral Waterproofing Co. W. J. hemuee, Layer le Phelan, ‘et al., in the U. S. District Court, Southern District of New York. Also against all important past users of McCormick Water- proofing. Manufacturers of The Sandusky Cement Company, Cleveland, Ohio Medusa Gray and White Portland Cement (Plain and Waterproofed) and Medusa Waterprocfing il 000 NM MOM BHM AB IUVUUUTIUUUITUUUUT VETTE UU | AVRAHAM UIUC ELC IeEEe HAL AH TCT IUA LECT ERO Ree VC UR | | AAW UU UM SrilMMNNULVITUAVIRLUUIAVUINTUIE UTA il E I NIAAA TTT Medusa Waterproofing Made in Both Powder and Paste Forms The Original Concrete Waterproofing of the Integral Type Manufactured under Basic Patents Beware of Imitations! The most Concentrated material of its kind on the market. Does not affect strength, setting or color of cement or concrete. Prevents discoloration and efflorescence For use in Cement Mortar, Cement Plaster, Stucco, Concrete Blecks (facing only), Concrete Pipe, Cement Shingles, Base- ment Walls and Floors, Grain Elevators and Storage, Cisterns, Silos, Tanks, Reservoirs, Swimming Pools and wherever Waterproof Concrete is necessary. EN rere. bol Sesh Ges MANUFACTURED FOR The Medusa Concrete Waterproofing Company Assignees of Patents by The Sandusky Cement Company Cleveland, Ohio, U. S. A. UNDER U. S. PATENTS TO Liebold, No. 771,080, September 27, 1904 Liebold, No. 847,015, March 12, 1907 Liebold, Re-issue, No. 12,470, April 3, 1906 Newberry, No. 851,247, April 23, 1907 Barrett, No. 898,547, September 15, 1908 MAA INN UUUI UTI TTUTTTTTTTTTTTTT TNO Su MMI AIAAAAAA H Fil Ili age two Medusa Waterproofing Made in Both Powder and Paste Forms _§_ fe] ——___. EKDUSA has been on the market for a number of years and has been used in every part of the world under every condition and in every character of construction in which portland cement is used. The extraordinary success of Medusa Waterproofing has led to a host of imitations and infringements. Many compounds on the market contain no waterproofing substance whatever, and are absolute frauds. Permanent and thorough waterproofing effect can be secured only by the chemical combination of fatty acids with alkaline earth bases, and this principle is fully covered by our patents. Description MEDUSA WATERPROOFING POWDER is a WATER- REPELLENT compound of FATTY ACIDS chemically com- bined with lime. Owing to its extreme fineness it may easily be mixed with cement in the necessary proportions. Packages In cotton, paper lined, non-returnable sacks, containing 40 pounds each. Description MEDUSA WATERPROOFING PASTE was perfected to meet a growing demand and preference among architects and cement users for a waterproofing which can be dissolved in the water to be used in mixing mortar or concrete. It is identical with the powder in resulting composition and waterproofing effect. The sole difference be- tween the two is the greater convenience of mixing which the paste form offers, though if the mixing of the powder with the cement is thoroughly and carefully done, equally good results can be obtained with either form. Packages MEDUSA WATERPROOFING PASTE is shipped in square cans, with large friction seal, of 1 gallon (8 lbs.) and 5 gallons (40 lbs.) each. . These are packed for shipment in substantial crates of 6 one-gallon or 2 five-gallon cans each. Samples A 14-pound can of MEDUSA WATERPROOFING PASTE or a 12-ounce package of MEDUSA WATERPROOFING POWDER will be sent free on request. On receipt of 50 cents we will forward, charges paid, a 3-pound sample of MEDUSA WATERPROOFING POWDER. THE SANDUSKY CEMENT COMPANY, CLEVELAND, OHIO Directions for Use EJ Quantity MEDUSA WATERPROOFING POWDER. To render concrete or cement work impervious to water use Powder to the amount of 2% of the weight of cement (8 pounds to the barrel of cement). Method of Mixing If a mechanical mixer is not used, add the powder Berend directly to the dry cement and mix by hand until the oy ey powder is uniformly distributed throughout the cement. Then add the sand in the proper proportion as usual, and again mix dry thoroughly. To the dry mixture of cement and sand add the crushed stone and mix until a uniform batch has been secured. The above procedure differs in no respect from the thorough mixing recommended for all concrete, except by the addition of the powder and its dissemination throughout the cement. Care should be taken to add the water a little at a time in order to avoid flotation and washing about of the fine particles of waterproofing. Mechanical Mixing Where a concrete mixer is employed the powder should be added directly to the cement at the hopper or on the loader. The time of mixing should be sufficient to ensure uniformity throughout the mass and should not be lessened with a view to increasing speed. The water should be added slowly to prevent flotation and washing about of the fine particles of waterproofing powder. The amount of water should be kept as low as conditions permit, a quaking consistency being most desirable. Quantity MEDUSA WATERPROOFING PASTE. To render concrete or cement work impervious to water use the paste to the amount of 2% by weight of the cement (8 pounds to the barrel of cement). Amount of Water The amount of water per cubic yard of concrete varies Serer eean | OTeatly with conditions. it theoretically requires only about 20 gallons of water to the barrel of cement to make 1:2 mortar or 1:2:4 concrete. This would be 80 gallons to the cubic yard. In actual prac- tice, however, the quantity of water used may be 40 to 60 gallons or even more per cubic yard. The amount of Waterproofing added should there- fore be in proportion to the cement or aggregates which go to make up the finished concrete. The contractor who has blindly followed a specification for a given quantity of paste to a given quantity of water is apt to be grievously sur- prised when he receives a considerably larger bill for waterproofing than he had anticipated. We therefore advise that the amount of water which a crew is using be determined, and the correct amount of waterproofing paste be added to the gauging water so that for each barrel of cement used, 1 gallon of paste (8 pounds) goes into the concrete. MANUFACTURERS OF MEDUSA WATERPROOFING Page three Page four Method of Mixing MEDUSA WATERPROOFING PASTE is to be dis- solved in the water with which concrete or mortar is to be mixed. To obtain easy solution, use soft and slightly warm water. Hard water tends to precipitate the paste in a curdy form; the addition, however, of a slightly increased quantity of the paste will overcome this Oeane Cold water, below 60 degrees F., also dissolves the paste with ifficulty. To save time and labor in dissolving, empty the paste from the can into a pail or tub, add an equal volume of water, and stir thoroughly until a smooth cream is formed; then add this mixture to the balance of the water to be used. It is a simple procedure for a man at the mixer to add for each barrel of cement one gallon (8 pounds) of waterproofing paste, diluted in a pail to at least 2 gallons of water. A Word as to the Amount Needed Though somewhat less than the quantity recommended may be used in many cases with excellent results, it has proved advisable in any struc- tural work to have a reasonable factor of safety. The need for such a factor of safety will be appreciated when the varying conditions affecting concrete work are considered. Specifications of proportions to be used in concrete mixtures vary considerably and so also do the aggregates selected. It has been found that the quantity prescribed, 2% of the weight of cement (8 lbs. to the barrel), is the correct amount to be used. A reason- able factor of safety is included in this figure and we advise that this speci- fication be rigidly maintained. Use Medusa Waterproofing Because: It causes concrete work to dry off immediately after a rain, avoiding the unsightly dark appearance which watersoaked concrete retains for hours. It makes concrete basement walls, tanks, cisterns, mortar and all concrete work postively waterproof and dampproof. It prevents the white efflorescence which renders cement work unsightly. It aids in preventing the formation of shrinkage cracks. Being sealed within the pores of the concrete and not subject to deprecia- tion, the waterproofing effect is permanent. This statement can not justly be made regarding the ordinary membranes and coatings which are higher in first cost and expensive to maintain. It adds very little to the cost of the concrete and needs no renewal. Medusa Is specified by the most eminent architects and engineers ——_————. in the United States and Europe. THE SANDUSKY CEMENT COMPANY, CLEVELAND, OHIO ——— The Theory of Waterproofing To understand what Medusa Waterproofing does it is necessary to consider the physical nature of concrete. Being composed of irregularly shaped particles, it is impossible for the mass to be more than compara- tively dense. Ordinary concrete, though possessing many points of excel- lence such as strength, resistance to wear and permanence, usually contains over 20% of voids, and it must accordingly be classed as a porous material. By the use of hydrated lime the pores may be to some extent filled, sufficient plasticity being acquired by this addition to give slightly greater density to the mass. Hydrated lime, however, cannot be classed as a waterproofing material since it absorbs water readily. The force against which we have to contend, in order to reduce water absorption of concrete, is the capillary attraction exerted by these minute pores or tubes. This may be demonstrated by observing the action of a sheet of blotting paper of which one corner is dipped in water. The water will be drawn up in the sheet despite the force of gravity. The force used to overcome this absorptive tendency is the force of surface tension. In order to waterproof concrete successfully, the ideal material is a finely divided, strongly water-repellent compound or a liquid paste which upon contact with the alkaline earth bases present in cement, forms a strongly water-repellent compound. It must possess the characteristic of forming a thin film, capable when properly supported, of holding back by surface tension and its own cohesion, the layer of water to which it is exposed. Such a material must be cheap and efficient enough to do the work when added to the cement in sufficiently small quantity not to affect the strength. It must be proof against oxidation and such chemical action as may be met with from the concrete or atmosphere. And last but not least, it must demonstrate in actual work that the concrete in which it is used is waterproof, even after a reasonably long period of time. Medusa Waterproofing fulfills these requirements and has proved thoroughly satis- factory on thousands of important pieces of construction. The function of Medusa Waterproofing in concrete is shown by the following simple experiment: | Place a handful of the finely ground powder in a pile on the surface of water in a tumbler. Press one finger through the center of the pile down into the glass. A very thin film of the powder will completely surround the finger, as may be seen by looking through the transparent walls of the glass. The finger will remain perfectly dry. In waterproofed concrete this film is of very minute thickness. The particles of cement, sand and stone fit together more or less closely, their weight being sufficient to force the waterproofing from between those of their surfaces which are in actual contact. The result is that a thin film is formed, bridging the pores. Upon being exposed to water-pressure this stretches and assumes the shape of the depression, forming a waterproof MANUFACTURERS OF MEDUSA WATERPROOFING Page five Page six film which prevents or reduces to a minimum the penetration of water and its absorption by the concrete. Example of a test made on water absorption of blocks 114” x 3” x 3” of 1:2:4 concrete, wet mixture, laid flat in water, half immersed, with and without Medusa Waterproofing. Percentage of water used in making up samples was the same in each case. This test was made with the idea of simulating the actual conditions of a concrete basement exposed to heavy rains. Percentage Increase in Weight of Test Pieces Water Absorption Time hi 2 hrs 4 hrs. 24 hrs. Nor Wiaterproonne ys. wen ee 5.8 6.4 a 8.0 1% Medusa Waterproofing ........ euaie cle tes Le ARS) 2% Medusa Waterproofing .......... 0.9 1.0 1.0 LZ Shrinkage Cracks Concrete, though probably the easiest and cheapest permanent struc- tural material to place, is also the most abused. The most inexpensive, crude and untrained labor is employed, cement is often skimped, too much water is generally added, mixing is seldom completely uniform and speed instead of quality is made the goal to be attained. One of the resulting defects in concrete which is due to imperfect con- struction is the Shrinkage Crack. These are usually a result of too rapid drying out of the concrete before the cement has had time to acquire its full strength. They ordinarily appear within the first week, as fine irregu- lar hair lines, and by dashing a pail of water over recently constructed concrete, they may, if present, be quite easily seen. At first the cracks are very small and are mainly confined to the surface, where the shrinkage, due to evaporation, is greatest. They are most prevalent on the surface of thin layers of concrete such as stucco, etc. By careful construction shrink- age cracks may be minimized or entirely eliminated. Certain precautions which will be found of value in their prevention are as follows: The base beneath the new concrete, stucco, or cement work, whether of cinders, clay, sand, brick, tile, etc., should be thoroughly soaked with water to prevent leaching out of moisture from the setting concrete. The finished concrete should be kept moist, steps being taken to prevent its drying out during the curing period even for a minute. It should be cov- ered with a wet canvas, kept soaked with water for a period of a week or ten days. Observance of these simple rules will greatly improve the strength of concrete, will prevent dusting floors and will guard against the possibility of leaky concrete walls, etc. THE SANDUSKY CEMENT COMPANY, CLEVELAND, OHIO lp oS Op Mosul Yi Le ee iy, “itty Mois Ky OE , We Wide Lz jp Nela Park Reinforced Concrete Reservoir, Cleveland, Ohio 120 feet in diameter, 11 ft. deep, 1,000,000 gallons capacity. Medusa Waterproofing used to prevent leakage. The Austin Company, Cleveland, Builders Wallis & Goodwille, New York City, Architects Reinforced Concrete Reservoir, New Ulm, Minnesota Made watertight by the use of Medusa Waterproofing F. D. Minium, City Engineer Circular Concrete Co., Minneapolis, Contractors SR —Mwsos> FFF MANUFACTURERS OF MEDUSA WATERPROOFING Page seven 8888S aos lll? AN Ce “ht Y. M. C. A. Swimming Pools and Buildings Basements Made Damp-proof and Pools Watertight with Medusa Medusa Waterproofing is being specified and used by eminent architects and con- tractors in the construction of Y. M. C. A. buildings, for making concrete basement walls and floors damp-proof, and also for waterproofing the swimming pools, among which are those located at New London, Conn.; Central Falls, R. I.; Erie, Pa.; Wheel- ing, W. Va.; Staunton and Norfolk, Va.; Elyria, Ohio; Paris, Ky.; Atlanta, Ga.; Moline, Ill.; Eau Claire and Superior, Wis., and Kellogg, Idaho. The Y. M. C. A. swimming pool, Wheeling, W. Va., is 20 feet by 40 feet, graded in depth from 5 to 7 feet, and the entire pool is lined with white tile and waterproofed with Medusa. Giesey & Faris were the architects. Medusa Waterproofing was used for swimming pool of Y. M. C. A. building, Elyria, Ohio. Pool is 20 feet by 60 feet, and is lined with tile embedded in water- proofed cement. Medusa Waterproofing was also used for exterior walls below grade line to prevent dampness in the basement, the waterproofed cement plaster being applied one-ha'f inch thick. Paul A. Rissmann was the architect, and The John Kaiser & Bro. Co., the contractors, both of Elyria. Naval Y. M. C. A. Swimming Pool, Norfolk, Va. In 1909 Medusa Waterproofing was used in the basement and swimming pool of Naval Y. M. C. A. building, Norfolk, Va. The basement is 6 feet below tide-water, and during these eight years has successfully withstood the high tides which are quite frequent in Norfolk. The work was examined a short time ago and we received a report that “it is absolutely waterproof and the results obtained in this building would certainly justify the use of Medusa Waterproofing for any work which is to withstand water pressure.” Louis E. Jallade, New York City, was the architect. Page eight THE SANDUSKY CEMENT COMPANY, CLEVELAND, OHIO y IOP mui, tli yy by Mea “hy ty Uf? sacl 4 ieee tt Le es EE i, tila... ep LL. Ww” We Another Swimming Pool Made Watertight With Medusa Y. W.C. A. Pool, Hartford, Conn. 60x23 ft., depth 4 to 6 ft. Tile faced pool, sidewalls and spillways. Medusa Waterproof Paste used throughout in mass concrete—one gallon (8 lbs.) to the barrel of cement. Louis Jallade, Architect H. Wales Lime Co., Contractors E) Absolutely Watertight After Five Years. Waterproofed with Medusa City Park Municipal Bathing Pool, Toledo, Ohio Similar Pools in Navarre and Riverside Parks. Medusa Waterproofing used in walk and floors eight years ago and no leaks have developed. F. E. Wirebaugh, Engr. for Board of Park Commrs. Schillinger Bros. Co., Contractors 88s=$mm9wmaa9aaSama9a»9ABnaaaaS9SB9S9aaBOoaO S500, MANUFACTURERS OF MEDUSA WATERPROOFING Page nine Se S.“——s———S>SS Fort Garry Hotel, Winnipeg, Manitoba, Canada 30,000 Pounds Medusa Waterproofing Powder Used This hotel is of French architecture, fourteen stories high, absolutely fireproof, the steel work non-expansive, partitions of terra cotta, floors of marble, tile or cement, and stairways of metal. Indiana buff limestone extends from the base of Canadian gray granite to the copper roofing. The floor of the rotunda is of marble inlaid with Belgian block, and the walls are finished in artificial Caen stone, which was also used on all wall surfaces of the palm room, cafe, main dining room and mezzanine floor to harmonize the entire ground floor. Erected and completed under the direction of the architects for the Grand Trunk Railway System, Ross & Macdonald, Montreal; general con- tractor, the George A. Fuller Company. age ten THE SANDUSKY CEMENT COMPANY, CLEVELAND, OHIO ites J Wir : Stops Basement Leaks In the construction of this building, a treacherous stratum of water sand was encountered in the sub-basement excavation twenty-eight feet below the sidewalk level. Water-tightness in the concrete foundation walls was finally accomplished through the use of Medusa Waterproofing to the amount of 2% of the weight of cement used. ecngave stones Pope-Whittemore Building, Cleveland, Ohio IIlenry Bacon, Architect Tidewater Bldg. Co., Contractors, New York MANUFACTURERS OF MEDUSA WATERPROOFING Page eleven orgie, eee Yl, mal oF i “ie ae ee ee ta Mijn LG ties ll” W/L (tgy// mre’ , Yi ty ; YY / il Apartment House, Washington, D. C. Medusa Waterproofing used below ground level Jos. J. Moebs, Consulting and Constructing Engineer, of Washington, D. C., the owner, architect and puilder of this apartment house says pee f take pleasure in assuring you that Medusa Waterproofing was used with excellent results, waterproofing walls below the ground level and elevator pent house.” a ———SSsSsSoOoNoqooOO oD Page twelve THE SANDUSKY CEMENT COMPANY, CLEVELAND, OHIO DS — nl is ie" Mee National Bank of West Virginia Medusa Has Withstood Floods for Years Wheeling, W. Va., April 17, 1918. “Relative to National Bank of W. Va., I beg to udvise that your Medusa Waterproofing was used in basement walls and floors for making them impervious to water, as the building is in the flood district and will probably be subjected to flood pressure at least once a year. I have every reason to believe that it will be satisfactory, as I employed the same method and used Medusa Waterproofing in the basement of an eight-story reinforced concrete warehouse for W. A. Wilson & Sons in this city, which has successfully withstood floods for three years, and in the basement of the twelve-story Windsor Hotel, this city.’’ CHARLES W. BATES, Architect and Structural Engineer. 8N8s—s—s=$—sS=™—=—$—$—$—@$0—$—$mmo9o9mm99WSOM@S 0500500 MANUFACTURERS OF MEDUSA WATERPROOFING Page thirteen EEE: Wt, tired ty y fs | MMMM : Yi Ui js Medusa Waterproofing Will Prevent the Corrosion of Steel in Concrete The following appeared under the caption of “Corrosion of Steel in Concrete” in Rock Products and Building Materials “Speaking on this subject some time ago, Dr. W. H. Walker, director of the research laboratory of applied chemistry of the Massachusetts Institute of Technology, said that every engineer is well aware of the fact that acidulated water, no matter how small the percentage of acid may be, tends to corrode steel by increasing the number of hydrogen ions present. It had been made clear, from tests he carried out, that there were certain alkaline substances present in concrete which corrected any acidity, and so protected the contained metal work from corrosion. “This fact has an important bearing upon the question whether concrete will pro- tect iron or steel from corrosion. Inasmuch as portland cement, when it sets or hardens, liberates a quantity of caustic lime, which is a strong alkali, the answer to the question must be in the affirmative. Iron or steel will not corrode when embedded in good concrete. But caustic lime is soluble in water, and poorly made concrete is not impervious to moisture. Therefore, if iron be embedded in concrete through which water is allowed at any time to percolate, this calcium hydrate will be slowly but surely dissolved. With it will disappear the inhibiting action of the concrete; and iron em- bedded therein will, in time, rust and become corroded. To ensure absolute protection of the reinforcing members of concrete construction, therefore, such concrete must be of good quality and sufficiently dense and carefully made to render it waterproof.” Oo} Medusa Waterproofing Used to Preserve Metal Reinforcement The Dilworth Public School Building is one of the largest in the district. 1,500 pounds of Medusa Waterproofing were used by the contractors and builders who advise as follows: The Sandusky Cement Co., Pittsburgh, Pa., April 20, 1918. Cleveland, Ohio, Gentlemen: We built the Dilworth School and used considerable Medusa Waterproofing in roof fill to keep the moisture from the metal reinforcement. We used the material in ac- cordance with your directions and found the same very satisfactory. This building cost about $230,000. Yours very truly, DAWSON CONSTRUCTION COMPANY, L. V. Dawson, President. ree ce ee ee se Page fourteen THE SANDUSKY CEMENT COMPANY, CLEVELAND, OHIO EE Yi Mt. Sinai, the New Jewish Hospital, Cleveland, Ohio A Well Appointed Hospital In a Beautiful Location George B. Post & Sons, Architects Reaugh Construction Co., Contractors The new Jewish Hospital, located facing Wade Park on East 105th Street, Cleveland, Ohio, for which Geo. B. Post & Sons, New York, were the architects, was built at a cost of $410,000. The architectural style adopted is that of the English Renaissance of the Georgian period. A wire-cut brick of general grayish pink, with unusually great variations of color, was selected, and was laid with a wide joint in old English bond, with black headers. A base of granite is surmounted by a ground floor treat- ment in Indiana limestone, above which are walls of brick trimmed with limestone on the first story of the main building, and terra cotta matching the limestone above this, and including the cornice and the trims of the other buildings. In modern hospital buildings dry basement walls and floors are a fea- ture, and in the construction of “Mt. Sinai” the Reaugh Construction Co., Cleveland, general contractors, used Medusa Waterproofing for this purpose. eS ———————————————————_————————————__——__——_—_—____ IIIT MANUFACTURERS OF MEDUSA WATERPROOFING Page fifteen United States Government Structures With the adoption of Medusa Waterproofing by the U. S. Government, this material has an enviable reputation, and architects, engineers and contractors should have no hesitancy in specifying and using it. Morris E. Payne, Engineer (American Forces Overseas), says: “TI am very glad to testify as to the quality of Medusa Waterproofing. I have had occasion to use quite a lot of your material and have found it to be equal to its manufacturer’s guarantee. “While in the employ of the Goverment I used large quantities in connection with the erection of a great many artillery fire-control structures, such as fire-control observing stations, signal corps switch- board rooms, power plant for searchlights, searchlight shelters and battle commanders’ stations. Most of these buildings were constructed of expanded metal on light steel frames, the expanded metal being plastered with cement, waterproofed with Medusa Waterproofing, on both sides. The buildings are concealed by earthwork to some extent, but at the same time are subjected to severe storms. I do not know of a single instance where any trouble was encountered after using your product.”’ Signal Corps Switchboard Room i) Medusa also proved successful in the following Government work, much of which has been subjected for a number of years to severe tests by the rise and fall of tide, ice floes, sun exposure or action of salt water: Sept., 1918. American University Experimental Station, Washington, D. C. Sept., 1918. 2000 pounds powder, 4000 pounds paste, U. S. A. Telephone & Telegraph Building for War and Naval Dept., at 1723 Front St., N. W., Washington, D. C., and three others. June, 1918. 16,750 pounds powder used by the constructing quartermaster at Camp Wadsworth, Spartansburg, S. C. June, 1918. 3984 pounds paste used by the Supply officer of Naval Yard on Lower Proving Ground, Indian Head, Maryland. Oct., 1918. 2000 pounds powder used by the U. S. Constructing Quartermaster at Brunswick, Ga. Nov., 1918. 2000 pounds powder used by U. S. Supply Officer at Portsmouth, Va., Naval Yard. Nov., 1918. 100 pounds powder Quartermaster Culver Military Academy, Culver, Ind. Sept., 1919. 3400 pounds powder Commanding Officer, Rock Island Arsenal, Rock Island, Ill. Newport Concrete Float, government landing at Torpedo Station. Charleston, South Carolina, Navy Yard for general purposes. South Boston, Quartermaster Terminal. New London Concrete Experimental Tank. Compressed Air Stations, 2nd Army District, Hog Island. Frankford Arsenal, general purposes. Navy Yards, Washington, D. C. Navy Yards, Philadelphia, Pa. Navy Yards, Norfolk, Va. Also Fisher’s Island, N. Y., Fort Wright. Swimming Pool, Ft. Lee, Va. Page sixteen THE SANDUSKY CEM VT COMPANY, CLEVELAND, OHIO ee oe a ee ee ee ee ee Yllldiitiires |