. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . equals the line; andin order to set up in c a counter magnetismequal to that set up in b by the static fromthe line, I make use of the electro-magnet t,placed in a shunt that passes around c. By this construction of compound differen-tial induction-coil, and the arrangement of theconnections, the inductive effects of pulsationsfrom the sending-instrument are balanced andneutralized, while the pulsations from the dis-tant station operate the receiving-instrument. I claim as my invention— 1. The compound differential
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . equals the line; andin order to set up in c a counter magnetismequal to that set up in b by the static fromthe line, I make use of the electro-magnet t,placed in a shunt that passes around c. By this construction of compound differen-tial induction-coil, and the arrangement of theconnections, the inductive effects of pulsationsfrom the sending-instrument are balanced andneutralized, while the pulsations from the dis-tant station operate the receiving-instrument. I claim as my invention— 1. The compound differential induction-coils a b Cj in combination with the polarizedrelay/ and the circuit-connections, substan-tially as set forth. 2. The artificial line, composed of the rheo-stat r and magnet t and ground-connection,in combination with the compound induction-coil and line-connections, substantially as setforth. Signed by me this 19th day of August, 1874. THOS. A. EDISON. Witnesses: Ohas. H. Smith,Geo. T. Pinckney, No. 178,222. T. A. TELEGRAPH. Patented May 30,
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