. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . n in either of claim as my invention— 1. The combination, with the tympan ar-ranged to respond to the human voice, of twoor more contact-points operated by such tym-pan and the electric circuits, substantially asspecified, whereby the current passing uponthe line is pulsated in unison with the vibra-tions of the tympan and its volume propor-tionately increased or decreased, substantiallyas set forth. 2. The combination, with the resonant caseand tympan, of two or more contact - pointsand rheostats
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . n in either of claim as my invention— 1. The combination, with the tympan ar-ranged to respond to the human voice, of twoor more contact-points operated by such tym-pan and the electric circuits, substantially asspecified, whereby the current passing uponthe line is pulsated in unison with the vibra-tions of the tympan and its volume propor-tionately increased or decreased, substantiallyas set forth. 2. The combination, with the resonant caseand tympan, of two or more contact - pointsand rheostats, adjusted substantially as speci-fied, to regulate the strength of the electricpulsations passing upon the line, as set forth. 3. The combination, with the diaphragmand resonant tube, of an electro-magnet anda spring-armature that is supported at bothends, substantially as set forth. Signed by me this 10th day of July, A. I).1877. THOS. A. EDISON. Witnesses: Geo. T. Pinckney,Harold Serrell. T. A. Telegraph Repeaters. No. 209,241. Patented Oct. 22, N. PETERS, PHOTO-LITHOGRAPHER, WASHINGTON, D C.
Size: 1302px × 1920px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone
