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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 685

An illustration from Collection of United States patents granted to Thomas A. Edison, 1869-1884, 1869, leaf 685
, to the same for maintainingmetallic connection in the helices that are with-in the field magnets, substantially as set forth. 3. In a dynamo - electric machine, a shuntaround the helices of the field-of-force magnets,and means for opening and closing that shuntperiodically, for the purposes and… … United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY.IMPROVEMENT IN ELECTRIC LIGHTS. Specification forming part of Letters Patent No. 219,628, dated September 16, 1879; application fife? December 9, 1878. To all whom it may concern : Be it known that I, Thomas Alva Edison,of…

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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