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 411
gin a magnet to produce a signal.I claim as my invention—A circuit for chemical telegraphs, composedof the primary circuit operated by the trans-mitting-instrument, and an induction-relaycoil to act in the receiving-instrument by asecondary circuit, substantially as set forth. Signed by me this… … AM.PH0T0-U7H0EMPHIC Co.N. Y.(osaosmstuocessj T. A. EDISON. 2 Sheets — Sheet 2, Automatic Telegraphy and Perforators Therefor. No. 151,209. Patented May 26J874. 7
Trade catalogs · Patents · Edison, Thomas A. (Thomas Alva), 1847-1931 · Inventions · Telegraph · Electric machinery · Electric apparatus and appliances · Phonograph · Telephone · Motors
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-465-205.webp)
