. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . gust 28, 1877; neither do Iherein claim a device for effecting a rise andfall of electric tension by a motion derivedfrom the diaphragm, that having been setforth in my prior application No. 130, filedApril 27,1877; and in my application No. 144,filed September 5, 1877, the electrodes aremoved to vary the resistance to the electriccurrent passing through a liquid. In the pres-ent instance the electrodes are claim as my invention—In an acoustic-telegraph apparatus, the com-bination of two stationary elec
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . gust 28, 1877; neither do Iherein claim a device for effecting a rise andfall of electric tension by a motion derivedfrom the diaphragm, that having been setforth in my prior application No. 130, filedApril 27,1877; and in my application No. 144,filed September 5, 1877, the electrodes aremoved to vary the resistance to the electriccurrent passing through a liquid. In the pres-ent instance the electrodes are claim as my invention—In an acoustic-telegraph apparatus, the com-bination of two stationary electrodes immersedin two cells, a conducting-fluid in said cells,and a fluid-connection between such cells, andmechanism actuated by a sound-vibrated bodyfor varying the dimensions of such liquid-con-nection and the conductivity of the same, sub-stantially as set forth. Signed by me this 8th dav of D. 1877. THOS. A. EDISON. Witnesses: Geo. T. Pinckney,Chas. H. Smith. T. A. for Acoustic or Telephonic-Telegraph. No. 203;019. Patented April 30, United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY, ASSIGNOR TO WESTERNUNION TELEGRAPH COMPANY, OF NEW YORK, N Y. IMPROVEMENT IN CIRCUITS FOR ACOUSTIC OR TELEPHONIC TELEGRAPHS. Specification forming part of Letters Patent No. 203,019, dated April 30, 1878; application filed February 21, 1878. To all whom it may concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the county of Middlesex andState of New Jersey, have invented an Im-provement in Circuits for Acoustic Telegraphs,(Case No. 150,) of which the following is aspecification: In telegraph-lines there are very often nu-merous wires running in the same directionupon the poles, and it has long been knownthat currents passing through one or more ofsaid wires set up iuduced currents in the otherwires. These ordinarily are harmless in theMorse and other systems of telegraphy; butwhere a wire for a telephone, acoustic, or spe
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