. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . L—^ J ill Mill iRTfl. ERS. Ph«o-L»(,0rwl,.r. ,,, D United States Patent Office. THOMAS A. EDISON, OF MENLO PAEK, NEW JERSEY, ASSIGNOE TO WESTEBNUNION TELEGBAPH COMPANY, OF NEW YOEK, N, Y. IMPROVEMENT IN TELEPHONES OR SPEAKING-TELEGRAPHS. Specification forming part of Letters Patent No. 203,018, dated April 30, 1878 ; application filed December 13, 1877. 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 Speaking-Tele-gra
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . L—^ J ill Mill iRTfl. ERS. Ph«o-L»(,0rwl,.r. ,,, D United States Patent Office. THOMAS A. EDISON, OF MENLO PAEK, NEW JERSEY, ASSIGNOE TO WESTEBNUNION TELEGBAPH COMPANY, OF NEW YOEK, N, Y. IMPROVEMENT IN TELEPHONES OR SPEAKING-TELEGRAPHS. Specification forming part of Letters Patent No. 203,018, dated April 30, 1878 ; application filed December 13, 1877. 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 Speaking-Tele-graphs, of which the following is a specifica-tion. I make use of two or more cells containinga mobile fluid, and these fluids are insulatedfrom each other, except when they come to-gether at a narrow opening or space, and theteis an electrode in each cell, and the diaphragmor other body vibrated by the atmosphericsound-waves regulates the opening or the press-ure at this point, so as to vary the electric ten-sion on the line to correspond with the sound-vibrations. In the drawings, Figure 1 is a
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