Back Page each insertion - 81.n0 a line. National Filter. Surface Washing ICE-ROUSE AND COLD ROOMBY R. engravings. Contained in SCIENTIFIC AMERICAN SUP and of all newsdealers. New Cas Engine 'The Baldwin' ti 'tIaex cC5o. Elevators and Hoisting Machinery 35 PARK ROW NEW YORK. THE BACKUS MOTOR THE BACKUS EXHAUSTER BACKUS WATER MOTOR CO. Newark N.J. RIDE WHEELS! T IHROUGH. PUNCHES and DIES for META I Small Brass Work & Models T. L. M cKEEN Easton Penn. Beaver Falls Pa. Send for Illus. Book and Estimates. Pierce Butler. k Pierce Mfg. Co. Want Agent.- SYRACUSE N. Y. gErrimmi. 3:3.A.MaJOE6. Best Cast Steel. Hardened Ground and Burnished 3-161n. In quality and density of Metal in uniformity of temper and in ac curacy and nicety of finish warrant ed unequaled. Simond's Rolling Machine Co. Fitchburg Mass. NATURE'S PROCESSES HAS NEVER FAILED. Results Guaranteed. II YATT PURE WATER COMPANY 16 184k 20 Courtlandt Street NEW YORK. THE HALL The Acme of Efficiency and Economy. No dangerous electricity. Especially applicable for Short Distance Lines between Offices and Factories stant and reliable inter-communication between inter mediate points is desired. Agents wanted in every city. THE HALL TELEPHONE CO. Broadway and Astor Place New York City. VAN DUZEN TIFT. PATENTS. cation of the SCIENTIFIC AMERICAN continue to ex for Inventors. Co. also attend to the preparation of Caveats. Copyrights on Infringements of Patents. All business intrusted to them is done with special care and promptness on very reasonable terms. A pamphlet sent free of cnarge on application con taining full information about Patents and how to pro cure them; directions concerning Labels Copyrights Designs Patents Appeals. Reissues Infringements As signments Rejected Cases Hints on the Sale of Pa tents etc. tent Laws showing the cost and method of securing patents in all the principal countries of the world. MUNN & CO. Solicitors of Patents 361 Broadway New York. BRANCH OFFICES.-No. 622 and 624 F Street Pa THE VI
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