. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . arge from the line;and the electro - magnet I is introduced in abranch around the receiving - instrument toset up a secondary or reactionary current, toaid in neutralizing the static discharge fromthe line, as iu aforesaid patent. This magnet also serves as a resistance todirect a portion of the current through thechemical paper. I claim as my invention— 1. The secondary battery, with poles ofsimilar materials, applied iu the main circuit,containing the receiving-instrument, in com-bination with a shunt arouud the r
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . arge from the line;and the electro - magnet I is introduced in abranch around the receiving - instrument toset up a secondary or reactionary current, toaid in neutralizing the static discharge fromthe line, as iu aforesaid patent. This magnet also serves as a resistance todirect a portion of the current through thechemical paper. I claim as my invention— 1. The secondary battery, with poles ofsimilar materials, applied iu the main circuit,containing the receiving-instrument, in com-bination with a shunt arouud the receiving-in-strument, containing a resistance or electro-magnet, for the purposes set forth. 2. The combination, with the signaling elec-tro-magnet, placed in the line, of a secondarybattery, also in the line, and a shunt aroundsuch instrument, containing a resistance, sub-stantially as set forth. Signed by me this 18th day of January, 1875. THOS. A. EDISON. Witnesses: Geo. T. Pinckney,Chas. H. Smith. No. 168,385. T. A. Telegraph. Patented Oct, 5, United States Patent Office. THOMAS A. EDISON, OP NEWARK, NEW IN DUPLEX TELEGRAPHS. Specification forming part of Letters Patent No. 168,3§5, dated October 5,1875; application filed January 26, 1875. Case 111. To all whom it may concern : Be it known that I, Thomas A. Edison, ofNewark, iii the State of New Jersey, have in-vented an Irnprovementin Duplex Telegraphs,of which the followiug is a specification : The object of tins invention is to more per-fectly balance and neutralize the static dis-charge of the line, so that there will not beany false pulsations. In the accompanying diagram the pulsationis given at the sendiug-station by the circuit-preserving key a, battery b, and connectionsc to the bridge-wires de between the line /andearth g. In the portion d of the bridge is theelectro-magnet hand rheostat fc, and in the por-tion e is the electro-magnet I and rheostat m,and the receivi
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