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Collection of United States patents granted to Thomas A. Edison, 1869-1884 (1869)

Edison, Thomas A. (Thomas Alva), 1847-1931, Peters, N. (Norris), lithographer, Hammer, William Joseph, 1858-1934, former owner. DSI, Edison, Thomas A. (Thomas Alva), 1847-1931, inscriber. DSI, United States. Patent Office · Washington, D.C. : U.S. Patent Office · leaf 391

An illustration from Collection of United States patents granted to Thomas A. Edison, 1869-1884, 1869, leaf 391
adjustable re-sistance and one or more electro-magnets areintroduced, as and for the purposes set forth. 2. The combination, with a chemical tele-graphic receiving-instrument, of several elec-tro-magnets and a switch, Ti9 to connect moreor less of said magnets in a shuut-circuit, forthe purposes… … United States Patent Office. THOMAS A. EDISON, OF NEWAEK, NEW JEESEY, ASSIGNOE TO HIMSELFAND GEOEGE HAEEINGTON, OF WASHINGTON, D. 0. IMPROVEMENT IN CIRCUITS FOR CHEMICAL TELEGRAPHS. Specification forming pari oi Lettc rs Patent No. 147,314, dated February 10,1874; application filed July 29, 1873.…

Trade catalogs · Patents · Edison, Thomas A. (Thomas Alva), 1847-1931 · Inventions · Telegraph · Electric machinery · Electric apparatus and appliances · Phonograph · Telephone · Motors

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