Pecks Patent Drop Presses, Blast Forges, Steel and Iron Drop Forgings. Beecher & Peck, New Haven, Conn. Master Keyed Padlocks and Locks. Factory and Railway outfits. Miller Lock Works, Philadelphia, Pa. Several large Paper Mills have adopted Volney W. Mason & Co.s Friction Pulleys for driving their machines. Providence, R. 1. Hull Vapor Cook stoves—Best in the world; sell everywhere. Agents wanted. Send for catalogue and terms. Hull Vapor Stove Co., Cleveland, Ohio. Crescent Steellube Scrapers are made on scientific principles- CrSSftnt Mfg. Co., Cleveland, Ohio. For Sale—The patent of Boiler Tube Expander. For particulars. apply to M. Cashin, 525 Howard St., San Francisco, Cal. For Sale—Patent of a Miter Box ; very cheap. Paul Cashin, 525 Howard St., San Francisco, Cal. Universal and Independent 2 Jaw Chucks for brass j work, etc., both box and round body. A. F. Cushman. Hartford, Conn. To Mechanics,—When needing Twist Drills, ask for Standard, or send for catalogue to Standard Tool Co., Cleveland, O. See page xv., Export Edition. Peerless Leather Belting. Best in the world for swift running and electric machines. Arny & Son, Phila. How to Keep Boilers Clean. Send your address for free 88 page book. Jas. C. Hotchkiss, 86 John St., N. Y. The most complete catalogue of Scientific and Mechanical Books ever published will be sent free on application to Munn & Co., 361 Broadway, N. Y. Shafting, Couplings, Hangers, Pulleys. Edison Shafting Mfg. Co.,86GoerJili.St., N.Y. Send L for catalogue and prices. Air Compressors, Rock Drills. Jas. Clayton, Bklyn,N.Y. Iron Planer, Lathe, Drill, and other machine tools of modern design. NewHaven Mfg. Co., New Ilaven, Conn. The leading Non-conducting Covering for Boilers, Pipes, etc., is Wm. Berkefelds Fossil Meal Composition : inch thickness radiates less heat than any other covering does with two inches. Sold in dry state by the pound. Fossil Meal Co., 48 Cedar St., N. Y. Every variety of Rubber Belting, Hose, Packing, Gaskets, Springs, Tubing, Rubber Covered Rollers, Deckle Straps, Printers Blankets, manufactured by Boston Belting Co.. 226 Devonshire St.. Boston, and 70 Reade St., New York. Write to Munn & Co., 361 Broadway, N. Y., for catalogue of Scientific Books for sale by them. Wanted—Patented articles or machinery to manufacture and introduce. Lexington Mfg. Co., Lexington, Ky. Mills, Engines, and Boilers for all purposes and of every- description. Send for circulars. Newell Universal Mil Co., 10 Barclay Street, N. Y. Presses & Dies. Ferracute Mach. Co., Bridgeton, N. J. For Power & Economy, Alcotts Turbine, Mt. Holly, N.J. Send for Monthly Machinery List to the George Place Machinery Company, 121 Chambers and 103 Reade Streets, New York. | Jf an invention has not been patented in the United States for more.than one year, it may still be patented in Canada. Cost for Canadian patent. $40. Various other foreign patents may also be obtained. For instructions address Munn & Co., SCIENTIFIC AMERICAN patent agency, 361 Broadway, New York. Guild & Garrisons Steam Pump Works, Brooklyn, N. Y. Steam Pumping Machinery of every description. Send for catalogue. Machinery for Light Manufacturing, on hand and built to order. E. E. Garvin & Co., 139 Center St., N. Y. Nickel Plating—Sole manufacturers cast nickel anodes, pure nickel salts, polishing compositions, etc. Complete outfit for plating, etc. Hanson, Van Winkle & Co. . Newark, N. J., and 92 and 94 Liberty, St., New York. For Steam and Power Pumping Machinery of Single and Duplex Pattern, embracing boiler feed, fire and low prsure pumps, independent condensing outfits, vac-uuik, hydraulic, artesian, and deep well pumps, air com-pressers, address Geo. F. Blake Mfg. Co., 44 Washington, St., Boston; 97 Liberty St., N. Y. Send for catalogue. Supplement Catalogue—Persons in pursuit of information of any special engineering, mechanical, or scientific subject, can have catalogue of contents of the SCIENTIFIC AMERICAN SUPPLEMENT sent to them free. The SUPPLEMENT contains lengthy articles embracing the whole range of engineering, mechanics, and physical science. Address Munn & Co., Publishers, New York. Send for catalogue of Scientific Books for sale by Munn & Co,, 361 Broadway, N. Y. Free on application. C. B. Rogers & Co., Norwich, Conn., Wood Working Machinery of every kind. See adv., page 348. Stephens Patent Bench Vises are the best. See adv., p. 348. Curtis Pressure Regulator and Steam Trap. See p. 285. Woodworkg Machy, Rollstone Mach. Co. Ad-v., p. 364. Anti-Friction Bearings for Shafting, Cars. Wagons, etc. Price list free. John G. Avery, Spencer, Mass. Best Automatic PlanerKnife Grinders. Pat. Face Plate Chucks. Am. Twist Drill Co. . Meredith, N. H. Iron and Steel Drop Forgings of every description. Billings & Spencer Co., Hartford, Conn. The Improved Hydraulic Jacks, Punches, and Tube Expanders. R. Dudgeon, 24 Columbia St., New York. Hoisting Engines. D. Frisbie & Co., Philadelphia, Pa. Tight and Slack Barrel Machinery a specialty. John Greenwood & Co.. Rochester, N.Y. See illus. adv., p. 349. Catalogue of Books, 128 pages, for Engineers and Electricians, sent free. E. & F. N. Spon, 35 Murray Street, N. Y. The best Steam Pumps for Boiler Feeding. Valley Machine Works, Easthampton, Mass. Woorl\7orkingMachinery. Full line. Williamsport Machine Co., . V.0 W. 3d St., Williamsport, Pa., U. S. A. Tie, and Splices. By J. T. Burgess, A Handbook for Seafarers and all who use Cordage. 12mo., cloth, illustrated. London. 1884. Sent, postage prepaid, on receipt of 50 eta,, by Munn & Co,, New York.