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trade in Shanghai. (P. 21). The Axgust trade of the United States in chemicals and allied products is reviewed. Although the exports recorded a gain o...
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December, 1923

I N D U S T R I A L A N D ENGINEERING CHEJWISTRY

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GOVERNMENT PUBLICATIONS Commerce Reports-October Notice--Commerce Reports are received by all large libraries and may be consulted there, or single numbers can be secured by application to the Bureau of Foretgn and Domestic Commerce, Department of Commerce, Washington, D . C . The regular subscription rate for these Commerce Reports mailed weekly is $3.00 per year (10 cents per single cofiy), payable in advance to the Superintendent of Documents, Government Printing O&e, Washington, D . C.

It is claimed that methods have been perfected by which commercial products can be obtained from the Athabaska tar sands Sound in the Province of Alberta, Canada. Two processes have been developed, one for the separation of oils and the other for the extraction of asphalt. (P. 16) The fertilizer industry of the Netherlands is reviewed, and statistics are given showing the imports and exports of artificial fertilizers. (Pp. 19-20) Export and import statistics for coal-tar products are given for the Netherlands, there having been a rather rapid and otherwise notable development in the manufacture and exportation of these products during the past two years. (Pp. 20-1) Mineral turpentine, which sells for about half the price for vegetable turpentine, is the variety most widely used in the paint trade in Shanghai. (P. 21) The Axgust trade of the United States in chemicals and allied products is reviewed. Although the exports recorded a gain of 25 per cent as compared with August, 1922, there was a decided drop from the previous months of 1923. On the other hand. the imports during August, 1923, not only gained over August, 1922, but also over the preceding month. The exports of chemicals and allied products had an aggregate value of $11,943,966, while the imports totaled $16,045,609, (Pp. 90-1) The Chilean Government, in order to finance the 1923 budget, has proposed the sale of certain Government nitrate lands. (P. 91) The total lignite resources of Italy have been estimated a t 295,189,000 metric tons. (P 105) The opening meeting of the Royal Commission t o inquire into the pulpwood resource4 of Canada and to determine the advisability o€ restricting or prohibiting the exportation of pulpwood from Canada was held on September 10 a t Ottawa. It is probable that hearings will be held from coast to coast. (P. 119) The dyestuffs market of the Irish Free State is now open t o American producers on equal terms with all others. (P. 119) In accordance with an Imperial Ordinance promulgated in Japan, effective September 17, the following commodities have been exempted from import duties until March 31, 1924; mineral oils; sengen root; boric acid; tartaric acid; bicarbonate of soda; salicylate of soda; peroxide of hydrogen; alum; chloroform; iodoform; milk sugar; antipyrin; santonin; carbonate of creosote; carbonate of guaicol; pepsin; and drugs, chemicals, and medicines. (P. 120) A recent French decree modifies the import duties, generally by way of reductions, on cottonseed oil and sulfuric acid. (P. 120) The Governor General of the Union of South Africa has proclaimed a rebate in the import duty on the following products: turpentine, vegetable or mineral, for use in the manufacture of paints, varnishes, and polishes; eucalyptus, pine, and other oils, for use in connection with the extraction of gold and other minerals by the flotation process; soy-bean, citronella, and mirbane oils, for use in the soap-making industry; waxes for use in the manufacture of polishes; and linseed oil, raw, for use in the manufacture of paints for resale. (P. 121) Orders for French heavy chemicals are improving continually and ate now equaling production. The large companies are busy because of the failure of German deliveries. Good business is being done in mineral acids. Secondary chemical industries are improving, with good demand for their products, especially from glass-makers and tanners. (P. 141) The paint and varnish market in Chile is reviewed. It is pointed out that Chile offers a good market for paints and varnishes, but that competition is keen. In proportion to the size of the country and its small population, relatively large quantities are consumed annually ’n a variety of ways, and statistics are given showing the principal sources of the various paints and varnishes imported into Chile. (P. 161)

A report from Berlin is to the effect that representatives of the Government, agriculturists, and the nitrogen industry have made an agreement whereby the price of nitrogen is fixed on the basis of the price of rye, the price of 140 kilos of rye being taken as that of 100 kilos of sulfate of ammonia. The price of calcium cyanamide is to be fixed a t eight-ninths and that of soda nitrate a t one and one-ninth the price of sulfate of ammonia. (P. 161) Owing t o the heavy sales during the last few months, it is announced that the product of nearly ail the German potash works is exhausted. This is the first time in the Potash Syndicate’s history that such large sales have been made in midsummer. (P. 161) The Federal Ministry of Food in Germany has agreed to the importation of 200,000 metric tons of Chile saltpeter by June 30, 1924, 50 per cent to be used for agriculture and 50 per cent for the fertilizer trade. (P. 161) The output of Thomas slag in Germany during the first three months of 1923, as compared with the same period in 1922, fell off 7 per cent and sales, 30 per cent. (P. 161) A marked decrease is reported in the sale of German pharmaceutical products and the reasons for this decrease are described. (Pp. 161-2) Germany, in 1922, broke up 10,200,000tons of raw limestone. Of this quantity 2,400,000 tons were sold raw, the remainder being worked up in refining works. (P, 162) About 1000 tons of fuel oil per month are now being used for industrial furnaces in Belgium, and the consumption is increasing a t the rate of 100 tons a month. (P.169) Great progress has been made in the tanning industry in the Union of South Africa in the past ten years, which is described in some detail. (Pp. 171-2) The production and export of Swedish paper and pulp during the first six months of 1923 reached quantities exceeding by a considerable margin those for the corGesponding period bf iast year, and comparing even well with so-called normal pre-war years. The cellulose market, while still quiet, is showing signs of improvement under the stimulus of the prospect of an increased demand from Great Britain. (P. 174) Under the terms of a recent decree of the Royal Hungarian Minister of Finance an export license is required for the following articles : alcohol, methylated alcohol; charcoal, peat and peat coal, lignite and coal, coke and all kinds of artificial heating material made thereof; wares of platinum for scientific or industrial use; salt; antimon regulus, sulfur antimon regulus; noxious gases for military purposes; every kind of salts of precious metals; and artificial fertilizers (not made of compound salts) except superphosphates, wood and coal ashes, bone dust, extinct bone charcoal, charcoal fit only for manure, Thomas slag, and other slags. (Pp. 183-4) The Government of Southern Rhodesia has given notice that until further order a rebate of the whole of the customs duty shall be granted on the following products: methylated spirits; alcohol of South African manufacture used solely for manufacturing or scientific purposes, or for fuel; South African spirits of a strength of 50 per cent over proof and upward when methylated; South African spirits used for industrial purposes; South African plain spirits used for scientific or teaching institutions for burning, preserving, or experimental purposes ; and South African rectified spirit used in the manufacture of ether or ether substances. (P. 186) The Polish-Silesian zinc industry is much concerned with conditions in the Ruhr. The induscry mines and smelts local ore but manufactures only semifinished products. (P. 193) The improvement in the German paint and varnish industry in the early part of the year proved to be of short duration. Prices advanced beyond the buying power of consumers and a heavy falling off of sales resulted. (P. 214) A report on the distillation of alcohol from “blackstrap” molasses in Cuba has been received in the Chemical Division of the Department of Commerce. Further information may be obtained by addressing that division. (P. 229) A German company’ is erecting a factory in Shanghai for the production of yeast and chemical products. (P. 229) A Spanish firm has indicated a desire to import insulin from the United States. Further information may be secured by addressing the Chemical Division, Department of Commerce. (P. 229)

INDUSTRIAL A N D ENGINEERING CHEMI8TRY

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The duty on crude iodine imported into Tunis has beenreduced. (P. 246) Experiments conducted in Sweden have demonstrated the commercial value of a motor spirit called “bentyl,yywhich is composed of sulfite spirit distilled from the sulfite lye of the woodpulp mills mixed with 20 to 25 per cent of benzene. As there are now twenty-two sulfite distilleries in Sweden with an annual output of about 20,000,000 liters of 100 per cent alcohol from lye, the new motor fuel may prove to be a serious competitor of imported gasoline. (P. 283) The situation in the German chemical industry is outlined, with particular reference to calcium cyanamide, ammonium sulfate, Chile saltpeter, phosphates and organic nitrogenous fertilizers, soda ash, caustic soda, sulfuric acid, and potash and potash salts. The production of ammonia and chemical fertilizer salts in Germany by the Haber-Bosch process of atmospheric fixation is entirely inadequate for feeding Germany’s soil. (P. 287-8) The vermilion industry in Hongkong is reviewed. (P. 288) During the first six months of 1923 Canada produced $87,152,248 of minerals, or an increase of 44 per cent over the output for the corresponding period in 1922. (P. 290) A new invention for the production of gas from peat to be used in the manufacture of glass or in the melting of metal has been reported from Ontario. (P. 294) A decree of the German Government prohibits the exportation of minerals and mineral oils except by permits. (Pp. 313-4) Germany does not require licenses for the exportation of prepared wax, solid fatty acids, paraffin, and similar candle-making materials; and other manufactures of grease, oil, or wax. (P. 314) Germany requires export licenses for salt, soda, bicarbonates and caustic; aluminium compounds; nitrates of ammonia ; lead and soda; acetate of calcium; sulfate of ammonia; metallic acids and salts; chalk; artificial fertilizers. (P. 3!5) A German governmental decree prohibits the exportation of certain essential chemical products of which German production is barely sufficient to cover domestic needs. The chemicals which cannot be exported are listed and include for the most part chemical fertilizer salts, except potash, as well as rock and brine salt, soda ash and caustic soda, artificial alumina, etc. (P. 314) The prohibition placed upon the exportation of gum copal from the Colony of Sierra Leone for a period of three years has expired and the period of prohibition is not to be extended. (Pp. 314-5) Costa Rica has reduced her import duty on vegetable waxes, oil of turpentine, paraffin oil, and on nitrobenzene. (P. 315) A Peruvian decree provides a 10 per cent ad valorem import duty on certain specified chemical raw materials required in the Peruvian industry. (P. 315) STATISTICS OF EXPORTS TO THE UNITED STATES Brazil-(P. 12) Hungary-(P. 95) Manganese ore Oil, fusel Antwerp-(P. 21) Stramonium Malaga-(P. 229) Gum copal Levigated red oxide ore Straits Settlements- -(P. 32) Refined tin Belgian Congo-(P. 288) Gum copal Madrid-(P. 32) Canada-(P. 308) Quicksilver China-(P. 123) Wood pulp Soy-bean oil Pulpwood Wood oil SPECIAL SUPPLEMENTS ISSUED Algeria Finland Sweden Australia Hongkong Uruguay Canada Indo-China Venezuela Danzig Portugal Virgin Islands of the United States Markets for American Pharmaceutical, Medicinal, and Biological Preparations. Trade Information Bulletin 149. Trade-Mark Protection in Europe. Trade Information Bulletin 155.

Notice-Publications f o r which price i s indicated can be purchased f r o m the Superintendent of Documents, Government Printing Ofice, Washington, D. C. Other publications can usually be supplied f r o m the Bureau or DePartment from which they originate.

Bureau of Foreign and Domestic Commerce Manzanillo, Mexico, Indigo Dyes. Issued October 25. 1923.

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Chemical Trade Bulletin I-b.

Bureau of Internal Revenue Denatured Alcohol. Formulas for Completely and Specially Denatured 15 pp. Issued Alcohol. Appendix, Regulations 61, Revised. September 21, 1923.

Vol. 15, No. 12

Bureau of Mines Additions, Removals, and Changes in Permissible List of Explosives from January 1, 1923, to August 31, 1923. J. E. CRAWSHAW.Reports of Investigations 2523. 2 pp. Issued September, 1923. Air Measurement Methods for Experimental Work on Fan-Pipe Installations. G. E. MCELROY AND A. S. RICHARDSON.Reports of Investigations 2527. 2 pp. Issued September, 1923. Bibliography of Magnesian Cements. G. H. WEST, R . L. SEBASTIAN, AND W. A. DARROW. Reports of Investigations 2534. 17 pp. Issued October, 1923. Bibliography of Petroleum and Allied Substances, 1921. E. H. BURROUGHS. Bulletin 220. 230 pp. Paper, 20 cents. Carbon Monoxide Hazards from Tobacco Smoke. G. W. JONES, W. P. YANT, AND L. B. BERGER. Reports of Iavestigations 2539. 6 pp. Issued October, 1923. Coal-Mine Fatalities in August, 1923. W. W. ADAMS. Reports of Investigations 2529. 3 pp. Issued September, 1923. Coal-Mine Fatalities in September, 1923. W. W. ADAMS. Reporis of Investigations 2538. 3 pp. Issued October, 1923. Coke-Oven Accidents in the United States during the Calendar Year 1922. W. W. ADAMS. Technical Paper 349. 37 pp. Paper, 5 cents. Erection of Barricades during Mine Fires or after Explosions. J. W. PAUL, B. 0. PICKARD,AND M. W. VON BERNEWITZ. Miners’ Circular 25. 28 pp. Paper, 5 cents. Explosives Used in August, 1923. Reports of Investigations 2536. 5 pp. Issued October, 1923. Explosives Used in July, 1923. W. W. ADAMS. Reports of Investigations 2522. 5 pp. Issued September, 1923. Explosives Used in September, 1923. W. W. ADAMS. Reports of Investigations 2543. 5 pp. Issued November, 1923. Friction Factors for Fan-Pipiag Used in Mine Ventilation. G. E. MCELROYAND A. S. RICHARDSON.Reports of Investigations 2540. 3 pp. Issued October, 1923. Graphites for Brass-Melting Crucibles. R. T. STULLAND I,. E. GEYER. Reports of Investigations 2542. 5 pp. Issued November, 1923. Manual for Oil and Gas Operations. Including Operating Regulations t o Govern the Production of Oil and Gas under the Acts of February 25, 1920, June 4, 1920, and March 4, 1923, and under Special Agreement by the United States. T.E. SWIGART AND C. E. BEECHER. Bulletin 232. 145 pp. Paper, 40 cents. Operating Regulations to Govern Coal-Mining Methods and the Safety and Welfare of Miners on Leased Lands o n the Public Domain under the Act of February 25, 1920 (Public No. 146), 48 pp. Paper, 5 cents. Relation of Operating Practice to Composition of Light Oil from Carbureted Water Gas. R. I,. BROWN,E. F. POHLMAN, AND H. G. BERGER. Reports of Investigations 2537. 9 pp. Issued October, 1923. T h e Electrothermic Metallurgy of Zinc. B. M. O’HARRA. This bulletin represents work done under a coijperative agreement between the Bureau of Mines, Department of the Interior, and the Missouri School of Mines and Metallurgy. Bulletin 208. 106 pp. Paper, I 5 cents. The Preparation and Properties of Normal Lead Trinitro Resorcinate. c. A. TAYLOR AND W. H. RINKENBACH. Reports of Investigations 2533. 6 pp. Issued October, 1923. T h e Transportation of Explosives in and about Mines. (State regulations relating thereto.) I,. C. ILSLEY.Reports of Investigations 2528. 8 pp. Issued September, 1923. Timbering of Metal Mines. E. A. HOLBROOK, R. V. ACETON,AND H . E. TUFFT. Bulletin 215. 72 pp. Paper, 25 cents.

Bureau of Standards Detector for Water Vapor in Closed Pipes. E. R. WEAVERAND P.G. LEDIQ. Technologic Paper 242. Paper, 5 cents. Tests of Caustic Magnesia Made from Magnesite from Several Sources. P. H . BATES,R. N. YOUNG,AND PAUL RAPP. Technologic Paper 239. 30 pp. Paper, 10 cents. United States Government Specification for Gloss Interior Lithopone Paint, White, and Light Tints. Circular 147. U. S.Government Standard Specification 67. 8 pp. Paper, 5 cents. United States Government Speciflcation for Leather Belting. Circular 148. U. S. Government Standard Specification 37. 9 pp. Paper, 5 cents. United States Government Specification for Water-Resisting Red Enamel. Circular 146. U. S. Government Standard Specification 66. 6 pp. Paper, 5 cents.

Geological Survey Coal in 1919, 1920, and 1921. F. G. TRYON AND S. A. HALE. Separate from Mineral Resources of the United States, 1921, P a r t 11. 18 pp. Issued October 24, 1923. Gypsum in 1922. K. W. COTTRELL. Separate from Mineral Resources of the United States, 1922, Part 11. 7 pp. Published October 18, 1923. Mineral Resources of the United States, 1920. Part 11. Non-Metals. R. W. STONE, geologist in charge. 629 pp. Cloth binding. Phosphate Rock in 1922. G. R. MANSFIELD. Separate from Mineral Resources of the United States, 1922, Part 11. 24 pp. Published October 16, 1923.

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December, 1923

INDUSTRIAL A N D ENGINEERING CHEMISTRY

Platinum and Allied Metals in 1922. J M. HILL. Separate from Mineral Resources of the United States, 1922,Part I. 11 p p Published October 8, 1923. Potash in 1922. G. R. MANSFIELD. Separate from Mineral Resources of the IJnited States, 1922,Part 11. 21 pp. Published October 12. 1923. Silver, Copper, Lead, and Zinc in the Central States in 1922. Mines Report, J. P. DUNLOPAND F. BEGEMAN.Separate from Mineral Resources of the United States, 1922,Part I. 32 pp. Published October 10, 1923. Surface Water Supply of the United States, 1921. Part VII. Lower MisAND E L sissippi River Basin. N C. GROVER,ROBERTFOLLANSBEE, WILLIAMS. Prepared in coliperation with the States of Colorado, Missouri, and Kansas. Watev-Supply Paper 527. 39 pp. Paper, 5 cents.

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Talc and Soapstone in 1922. EDWARD SANPSON. Separate from Mineral Resources of the United States, 1922, Part 11. 6 pp. Published October 11, 1923.

Public Health Service Health Conditions among Chemical Workers, with Respect to Earnings. F. M. PanLxPs AND G. A. SAGER. Public Health Repovts 38 (October 5, 1923), 2320-2. The Pyrotannic Acid Methdd for the Quantitative Determination of W. P. YANT, Carbon Monoxide in Blood and Air. R. R. SAYERS, AND G. W. Joxes. Public Health Reports 88 (October 5, 1923), 2311-20.

MANUFACTURERS’ TECHNICAL PUBLICATIONS Mechanical Fuel Oil Burning Systems. Bulletin 16-OA, 16-OG, and 17-A Descriptive catalogs of mechanical and low and high-pressure fuel oil & KOERTburners and a gear pump for viscous liquids. 68 pp. SCHUTTE ING Co., 1239 North 12th St., Philadelphia, Pa. Microscopes and Bacteriological Materials. Descriptive illustrated catalog, Astronomical and Astrophysical Instruments. Descriptive catalog of inMATERIALSCo., Pittsburgh, Pa. 48 pp. SCIENTIRIC struments for this purpose manufactured by the publishers. 48 PP. Optical Glass. Descriptive manual and catalog with price list of optical & Co., Chicago, Ill. Wm. GAERTNER & LOMBOPTICALCo., Rochester, N. Y. glass. 20 pp. BAUSCX Automatic Temperature Control. Catalog 86, descriptive of indicating, Orifice Meters. Bulletin 113-1. Descriptive catalog of indicating and recording, and signaling devices for the automatic control of temperature. Co., INC.,Foxboro, recording orifice meters. 28 pp. THE FOXBORO 40 pp BROWNINSTRUMENT Co., Philadelphia, Pa. Mass. Bailey Boiler Meters. Bulletin 42. Descriptive catalog of these meters Ozone and Electrolytic Water Purifying Apparatus. Technical Publication and their use. 24 pp. BAILEYMETERCo., Cleveland, Ohio. 10. A concise treatise on the principles, design, and action of U.S.ozoniBiological Laboratory Supplies. Catalog B, 1923. Catalog of apparatus OZONECo., zers and Hartman sterilizers. 35 pp. UNITED STATES & AMEND, for bacteriological and biological laboratories. 172 pp. EIMER Scottdale, Pa. Third Ave., 18th t o 19th Sts., New York, N. Y. Photomicrography. An introduction to photography with the microscope. Bristol Recording Thermometers and Gages. Catalog 1006, Pressure and KODAKCo., Rochester, N. Y. 36 pp. EASTMAN Vacuum Gages. 84 pp. Catalogs 1102, 1203,1302,and 1401, Recording Pneumatic Collecting and Conveying Systems. Catalog 291. Sturtevant Thermometer and Pyrometers. 44,48,and 64 pp. Bulletin 289,Bristol fan systems for collecting dust and conveying materials, with tabular Temperature Controllers. 16 pp. Preliminary Catalog 1501 and Bullcdata on performance of fans, properties of air, and friction loss in pipes. tin 2111. Electrical Recording Voltmeters, Wattmeters, and Ammeters. Co., Hyde Park, Boston, Mass. 72 pp. B. F. STURTEVANT 32 arid 20 pp. Bulletin 317, Tachometers. 34 pp. Bulletin 311. RePyrex Laboratory Glassware. Descriptive catalog and price list, 16 p p , cording Psychrometers and Humidity Recorders. 12 pp. Catalog 717, CORNING GLASSWORKS,Corning, N. Y. Belt Fasteners. 40 pp. TEEBRISTOLCo., Waterbury, Conn. Reed Air Filters. Bulletins 106, 107, 108, 109, 110, and 111. Descriptive Caldwell Tanks. Descriptive, illustrated catalog and price list of wooden catalog of Reed filters showing their construction and uses. WILLIAM & Co., Louisville. KY. tanks and accessories. 92 pp. W. E. CALDWELL 1 Co., Louisville, Ky. REEDENGINEERING Castings, Gray, Chemical Iron, and Semisteel. Illustrations of various Rubber. Volume Increase of Compounded Rubber under Strain. Research PIPE & FOUNDRY Bulletin. 12 pp. THBNEW JERSEY ZINCCo., 160 Front St., New York, form&of chemical castings. 48 pp. U. S. CAST IRON Co., Burlington, N. J. N. Y. Cenco Hyvac Pump. Bulletin 92. Description of this pump capable of Ruggles-Coles Dryers. Catalog 16. Descriptive catalog of dryers and the Co., 460 producing vacuum of 0.001 mm. 4 pp. CENTRALSCIENTIFIC particular uses for which they are fitted. 40 pp. RUGGLES-COLES East Ohio St., Chicago, Ill. ENGINEERING Co., 120 Broadway, New York, N. Y. Centrifugal Compressors. Instruction Book 88,600. Operating data for Sludge Acid Concentration. Bulletin 2. Description of the Simonsonmulti-stage turbine driven centrifugal compressors for gas exhauster and Mantius vacuum process. 12 pp. Acid Recovery Division, UNITED Co., Schenectady, N. Y. gas booster service. 62 pp. GENERALELECTRIC LEADCo., 111 Broadway, New York, N. Y. Coal, Coke, and By-Products. Standard laboratory tests and apparatus. Tag General Catalog. A general catalog of the Taglidbue products consistMATERIALS Co., Pittsburgh, Pa. 36 py. SCIENTIFIC ing of sections dealing with thermometers both indicating and recording, Commercial Minerals. Directory of commercial minerals in Georgia and hydrometers, oil-testing instruments, mercurial vacuum gages, pyromAlabama along the line of The Central of Georgia Railway. Carefully eters, Tag-mono flue gas analysis recorders, and automatic controllers of indexed catalog of the minerals in this particular territory and general temperature, pressure, humidity, time, liquid level, etc. Also distributed map of the territory. 154 pp. Industrial Department, THECENTRAL as separate catalogs, dealing with each of these subjects. 215 pp. THE OR GEORGIA RAILWAY Co., Savannah. Ga. C. J. TAGLIABUE MFG. Co., 18 Thirty-third St., Brooklyn, N. Y. Cross Cracking Process. Technical description of the process and its Thickening and Clarification. Bulletin 12. Description of the uses of Co., 700 Baltimore Ave., operation. 16 pp. GASOLINEPRODUCTS Dorr thickening and clarifying equipment. 24 pp. THE DORR Co., Kansas City, Mo. 247 Park Ave., New York, N. Y. Crysteel. Descriptive of Crysteel enamels. 32 pp. Crysteel Works, THE Turboblower. Catalog 312. Itemized data on the Sturtevant turboblower BENJAMINELECTRICMANUFACTURING Co., 847 W. Jackson Blvd., with reference t o installation, construction, performance, and operation. Chicago, Ill. Co., Hyde Park, Boston, Mass. 40 pp. B. F. STURTEVANT Dunham Vacuum Heating System. Bulletrns 103 and 110. Descriptive Water Filters. Bulletin 501, descriptive of Graver horizontal pressure of the Dunham medium pressure trap and the Dunham heating system. pipe water filters. 12 pp. GRAVERCORP.,East Chicago, Ind. Co., 230 East Ohio St., Chicago, Ill. 4 and 12 pp. C. A. DUNHAM Wendt’s Electro-Titration Apparatus. Bulletin 86. Description of this Electric Motors. How to Choose Them. 32 pp. RELIANCEELECTRIC apparatus and its use with full directions. 12 pp. CENTRAL S C I E N T I ~ I C & E N G I N E E R I N G CO.,Cleveland, Ohio. Co., 460 East Ohio St., Chicago, 111. Friction Clutches. Catalog 1. Descriptive catalog and price list of friction X-Rays. Simple physics of X-ray photography, together with catalog of Co.. Louisville, Ky. clutches. 16 PP. W. E. CALDWELL accessories and operating details. 52 pp. EASTNAN KODAKCO., Rochester, N. Y. Hardinge Conical Mills. Catalog 13, descriptive of mills and their uses. 32 pp. HARDINGE C o , 120 Broadway, New York, N. Y. York Ammonia Fittings and Supplies. 4th edition, 2nd issue. Descriptive illustrated catalog of ammonia-handling equipment, together Hump Methods for the Heat Treatment of Steel. Catalog 90. Descripwith tabulated data on the manufacture of ice and artificial refrigeration. tion of methods and instruments used in heat treating. 30 pp. LEEDS Co., York, Pa. & NORTHRUP Co ,4901Stenton Ave., Philadelphia, Pa. 158 pp. YORKMANURACTURING Marcy Ball Mill. Catalog 69. Descriptive catalog of Marcp ball mill Zinc as a Paint Pigment. Comparison of various paint pigments. 20 pp. with flow sheets. 36 pp. MINE &SMELTER THENEWJZRSEYZINCCo., 160 Front St., New York, N. Y. SUPPLYCo., Denver, Colo.

N o t i c e - A n y publications mentioned under this heading will be sent free, unless otherwise noted, to readers oj THIS JOURNAL, an rcguest to the firm issuing the bublication. When writing for any of these items kindly mention INDUSTRIAL AND ENGINEERING CHEMISTRY.