. Collection de brevets des États-Unis accordée à Thomas A. Edison, 1869-1884 . est Lightterthan le roseau, pour faire fonctionner les dispositifs de fermeture de circuit, essentiellement comme indiqué. 4. La combinaison, avec un instrument acoustique de recession, d'un circuit dérivé de la ligne principale contenant un condenseur, et d'une résistance dans la ligne principale, essentiellement comme savant. 5. La combinaison, avec une vibration reedin un télégraphe acoustique, de quatre électro-magnétspools placés dans la ligne principale, corroborealyas établi. 6. La combinaison, avec le reedm vibrant, du levier u, et du circuit local, arrangedso que th

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. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . is lighterthan the reed, to operate circuit-closing devices, substantially as set forth. 4. The combination, with an acoustic re-ceiving-instrument, of a derived circuit fromthe main line containing a condenser, and a re-sistance in the main line, substantially as setforth. 5. The combination, with a vibrating reedin an acoustic telegraph, of four electro-magnetspools placed in the main line, substantiallyas set forth. 6. The combination, with the vibrating reedm, of the lever u, and local circuit, arrangedso that the lever u is only acted upon by thereed m when in full vibration, substantially asset forth. 7. The combination, with an acoustic tele-graph, of a local circuit, a secondary battery, a receiving-instrument or souuder, and a cir-cuit-closer operated by the reed, substantiallyas set forth. Signed by me this 9th day of May, A. D.1876. THOS. A. EDISON. Witnesses: J. D. Kuss, Chas. Batchelor. T. A. EDISON. ELECTRO-HARMONIC MULTIPLEX TELEGRAPH.No. 185, 507. Patented Dec. 19, 13 76.. N. PETERS, Photo-LUhographer. Washington. D. C. United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, JfEW JERSEY, ASSIGNOR TOWESTERN UNION TELEGRAPH COMPANY. IMPROVEMENT IN ELECTRO-HARMONIC MULTIPLEX TELEGRAPHS. Specification forming part of Letters Patent No. 185, 507, dated December 19, 1876; application filed August 31, 1876. To all whom it may concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the State of New Jersey, haveinvented an Improvement in Acoustic Tele-graphs, of which the following is a specifica-tion : The object of this invention is to subdividea single telegraphic circuit into a number ofindependent signaling-circuits, each of whichmay be operated by means of the signalingapparatus in ordinary use, and signals trans-mitted upon each signaling-circuit withoutinterfering with, the others, and in either di-rection at pleasure. The invention consists, first, in a methodand

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