. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . ngs 13 15,contact-points c and d, and contact-screws 1416, when so arranged that the line will bemomentarily connected directly to-the earthwhile the fork is passing its center of oscilla-tion in either direction, substantially as setforth. 11. The combination • of the transfer-reeds and their signaling-instruments, local circuit,and batteries with the maiu-line reed or reeds,substantially as and for the purpose setforth. 12. The tuning forks or reeds A and L,with their contact-springs, contact-points, andmain batte
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . ngs 13 15,contact-points c and d, and contact-screws 1416, when so arranged that the line will bemomentarily connected directly to-the earthwhile the fork is passing its center of oscilla-tion in either direction, substantially as setforth. 11. The combination • of the transfer-reeds and their signaling-instruments, local circuit,and batteries with the maiu-line reed or reeds,substantially as and for the purpose setforth. 12. The tuning forks or reeds A and L,with their contact-springs, contact-points, andmain battery, in combination with the signal-ing apparatus R and S, substantially as de-scribed, and for the purposes set forth. 13. The combination, in one and the samelocal circuit, of several set of transfer-forks ateach of the different stations, substantially asand for che purposes set forth. Signed by me this 16th day of August, 1876. THOS. A. EDISON. Witnesses: Geo. D. Walker,Geo. T. Pincknet. T. A. ELECTRIC 186,330. Patented Jan. 16, i, Photo-Lithographer, Washington. D. C. United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY. ASSIGNOR TO THEWESTERN UNION TELEGRAPH COMPANY. IMPROVEMENT IN ACOUSTIC ELECTRIC TELEGRAPHS. Specification forming part of Letters Pateot No. , dated January 16, 1877 ; application tiled May 16, 1876. To all idiom it may concern: Be it knowu that I, A. Edison, ofMenlo Park, in the county of Middlesex andState of New Jersey, have invented an Im-provement in Acoustic Telegraphs, of whichthe following is a specification : The object of this inveutiou is to employ amain battery always in the close circuit of themain line, and to use a short-circuiting wirefor that main battery, so arranged with refer-ence to the vibrating reeds that, the vibrationsshall open and close the short-circuiting wire;hence, the main battery will send its pulsa-tions on the main line when the short circuiti
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Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone
