. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . everse as the lever falls, thus insuring accu-racy by the repetition of the signal, and theentire signaling occupying such a small time—not more than two or three seconds—therisk of a simultaneous signal from some otherinstrument is so small as to require no claim as my invention— 1. A signal apparatus, composed of a leverwith a segmental circuit-closing surface, acontact-roller,, a finger-key and connections,substantially as set forth. 2. A circuit-closing segment and a weight atthe end of a lever, in
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . everse as the lever falls, thus insuring accu-racy by the repetition of the signal, and theentire signaling occupying such a small time—not more than two or three seconds—therisk of a simultaneous signal from some otherinstrument is so small as to require no claim as my invention— 1. A signal apparatus, composed of a leverwith a segmental circuit-closing surface, acontact-roller,, a finger-key and connections,substantially as set forth. 2. A circuit-closing segment and a weight atthe end of a lever, in combination with a cir-cuit-closer and connections, substantially asset forth. 3. A telegraphic alarm and signaling appa-ratus, formed of two or more levers with cir-cuit-closing surfaces contained within a box,with finger-pieces outside said box, substan-tially as specified. Signed by me this 2d day of April, A. THOMAS A. EDISON. Witnesses: Geo. T. D. Walker, / Ccwe 69. T. A. Chemical Telegraphs. ,843. Patented Nov. 17, N. PETERS. Pholo-Lithograplwf. Wothington, 0. C. United States Patent Office* THOMAS A. EDISON, OF NEWAEK, NEW JEESET, ASSIGNOR TO HIMSELFAND GEOEGE HAEEINGTON, OF WASHINGTON, DISTRICT OF COLUMBIA. IMPROVEMENT IN DUPLEX CHEMICAL TELEGRAPHS. Specification forming part of Letters Patent No. 156,813, dated November 17, 1874; application filed. March 13, 1873. Case 69. To all whom it may concern: Be it known that I, Thomas A. Edison, ofNewark, in the county of Essex and State ofNew Jersey, have in vented an Improvement inCircuits for Chemical Telegraphs, of which thefollowing is a specification: The object of this invention is to transmittwo dispatches over the same wire at the sametime by telegraphs employingperforated trans-mitting-paper and chemical receiving-paper. I make use of apparatus for transmittingby perforated paper, and receiving the mes-sages on chemical paper at the respectiveends of the line, an
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