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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 503

An illustration from Collection of United States patents granted to Thomas A. Edison, 1869-1884, 1869, leaf 503
breaker a, incombination with the circuit-closing lever e,notched, armature lever u, spring t, and ar-mature-lever o, substantially as set forth. 3. The mechanical compensator, consist-ing of the spring t and notched lever u, forneutralizing the effect of the static charge in a duplex telegraph,… … N. PETERS. PhcJo-UthegBiptw. Wahington, D. a 2 Sheets—Sheet 2. T. A. EDISON.AUTOGRAPHIC PRINTING. Patented Aug. 8, 1876.

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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