. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . ring, in consequence of the current in bothhelices I m producing the same polarity in thecores; but when a pulsation of the oppositepolarity is sent the type-wheel magnet will beinoperative, and the printing-magnet energizedto give the impression. In this manner a printing-telegraph can be operated by one Una-wire withoutany switch or polarized circuit-changer, thelocal constant battery being employed witheach instrument. I claim as my invention— The compouud type-wheel magnet and thecompound printing-m
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . ring, in consequence of the current in bothhelices I m producing the same polarity in thecores; but when a pulsation of the oppositepolarity is sent the type-wheel magnet will beinoperative, and the printing-magnet energizedto give the impression. In this manner a printing-telegraph can be operated by one Una-wire withoutany switch or polarized circuit-changer, thelocal constant battery being employed witheach instrument. I claim as my invention— The compouud type-wheel magnet and thecompound printing-magnet in a printing-tele-graph instrument, in combination with a localconstant circuit connected to one set of spoolsin such magnets, and the main-line currentconnected to the other spools of such magnets,to be operated substantially in the manner andfor the purposes set forth. Signed by me this 26th day of April, A. T. A. EDISON. Witnesses: Geo. T. Pijnckney,Chas. H. Smith. 2 T. A. in Printing-Telegraphs. No. 128,606. Patented July 2, 1872. I -.
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