. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . 2 Sheets—Sheet 2. T. A. No. 221,957. Patented Nov. 25, PHOTO-LITHOGRAPHER, WASHINGTON, D C. United States Patent Office THOMAS A. EDISON, OF MENLO PABK, NEW IN TELEPHONES. Specification forming part of Letters Patent No. 221,95S, dated November 25, 1879; application tiled March 31, 1879. 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 Telephones, (,)of which thefo
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . 2 Sheets—Sheet 2. T. A. No. 221,957. Patented Nov. 25, PHOTO-LITHOGRAPHER, WASHINGTON, D C. United States Patent Office THOMAS A. EDISON, OF MENLO PABK, NEW IN TELEPHONES. Specification forming part of Letters Patent No. 221,95S, dated November 25, 1879; application tiled March 31, 1879. 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 Telephones, (,)of which thefollowing is a specification. The object of this invention is to transmitsounds electrically to a distance and reproducethe same with great power and without loss ofvolume. The peculiar action upon which this inven-tion is based was patented by me January 19,1875, and numbered 158,787. An application ofthis action to telephony was also applied forby me July 20, 1877, No. 141, in which thereis a band of paper moving beneath a point con-nected to the diaphragm. This feature, there-fore, is not broadly claimed herein. The present application consists more p
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