. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . for increasing or decreasing theelectric tension, like those shown in this ap-plication, and instruments for responding tothe pulsations sent by these keys are therefore do not herein lay any claim to thesame. What I claim is— 1. In combination with two main-line cir-cuits, each capable of quadruplex operation,therepeating-magnets, local circuits, switches,and connections, arranged substantially as setforth, so that either message may be repeatedindependently of other messages, substan-tially as set forth. 2
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . for increasing or decreasing theelectric tension, like those shown in this ap-plication, and instruments for responding tothe pulsations sent by these keys are therefore do not herein lay any claim to thesame. What I claim is— 1. In combination with two main-line cir-cuits, each capable of quadruplex operation,therepeating-magnets, local circuits, switches,and connections, arranged substantially as setforth, so that either message may be repeatedindependently of other messages, substan-tially as set forth. 2. The combination, with the receiving-sounders in one line, of repeating-instruments,local circuits and switches, and transmitting-instruments in the other line, arranged andoperating substantially as and for the pur-poses set forth. Signed by me this 24th day of February, 1875. THOMAS A. EDISON. Witnesses: Geo. T. Pinckney,Geo. D. Walker. T. A. EDISON, Assignor of one-half interest to G. B. Prescott. Quadruplex-Telegraph 8,906. Reissued Sept. 23, United States Patent Office. THOMAS A. EDISON, OF MENLO PAEK, NEW JEBSEY, ASSIGNOB OF ONE-HALF INTEBEST TO OEOEOE B. PEESCOTT. IMPROVEMENT IN QU A D RU P LEX-TELE G RAPH REPEATERS. Specification forming part of Letters Patent No. 209,241, dated October 22, 1878; Eeissne No. 8,906, datedSeptember 23,1879; application filed November 16, 1878. To all whom it may concern: Be it known that I, Thomas A. Edison,now of Menlo Park, in the county of Middle-sex and State of New Jersey, have inventedcertain new and useful Improvements in Quad-ruples Telegraphs, which improvements arefully set forth in the following specification,reference being had to the accompanying draw-ings. My present invention consists in certain im-provements upon the apparatus described inmy application for Letters Patent filed on orabout the 1st day of September, A. D. 1874,for improvement in duplex telegraphs, anddesignated as Case 99; and has
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