Wanted--A pushing man, capable of taking charge of a shop for building engines. A fine chance for a skilled mechanic. Address, with references, etc., lock box 17, York, Pa. Blake's Improved Belt Studs are the best fastening for Leather and Rubber Belting. Greene, Tweed & Co., 83 Chambers St., New York. Wanted--Tool agents in shops. Outfit free. E. H. Randall & Co., 154 Lake St., Chicago, Ill. _Link Belting_ and Wheels. Link Belt M. Co., Chicago. The _Railroad Gazette_, handsomely illustrated, published weekly, at 73 Broadway, New York. Specimen copies free. Send for catalogue of railroad books. _Protection for Watches._ Anti-magnetic shields--an absolute protection from all electric and magnetic influences. Can be applied to any watch. Experimental exhibition and explanation at "Anti-Magnetic Shield & Watch Case Co.," 18 John St., New York. F. S. Giles, Agt., or Giles Bro. & Co., Chicago, where full assortment of Anti-Magnetic Watches can be had. Send for full descriptive circular. Woodworking Machinery of all kinds. The Bentel & Margedant Co., 116 Fourth St., Hamilton, O. Guild & Garrison's Steam Pump Works, Brooklyn, N. Y. Pumps for liquids, air, and gases. New catalogue now ready. Concrete patents for sale. E. L. Ransome, S. F., Cal. The Knowles Steam Pump Works, 44 Washington St., Boston, and 93 Liberty St., New York, have just issued a new catalogue, in which are many new and improved forms of Pumping Machinery of the single and duplex, steam and power type. This catalogue will be mailed free of charge on application. Presses & Dies. Ferracute Mach. Co., Bridgeton, N. J. Nickel Plating.--Sole manufacturers cast nickel anodes, pure nickel salts, polishing compositions, etc. $100 "_Little Wonder_." A perfect Electro Plating Machine. Sole manufacturers of the new Dip Lacquer Kristaline. Complete outfit for plating, etc. Hanson, Van Winkle & Co., Newark, N. J., and 92 and 94 Liberty St., New York. Iron Planer, Lathe, Drill, and other machine tools of modern design. New Haven Mfg. Co., New Haven, Conn. 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. Planing and Matching Machines. All kinds Wood Working Machinery. C. B. Rogers & Co., Norwich, Conn. Billings' Drop Forged Steel C Clamps. Drop Forgings, all kinds. Billings & Spencer Co., Hartford, Conn. Curtis Pressure Regulator and Steam Trap. See p. 45. Chucks--over 100 different kinds and sizes in stock. Specials made to order. Cushman Chuck Co., Hartford, Ct. The Improved Hydraulic Jacks, Punches, and Tube Expanders. R. Dudgeon, 24 Columbia St., New York. Hoisting Engines, Friction Clutch Pulleys, Cut-off Couplings. D. Frisbie & Co., 112 Liberty St., New York.