. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . Patented Dec. 9, T. A. Carbon No, 222,390. United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY, ASSIGNOR TO WESTERNUNION TELEGRAPH COMPANY, OF NEW YORK, N. Y. IMPROVEMENT IN CARBON-TELEPHONES. Specification forming part of Letters Patent No. 322,390, dated December 9, 1879 ; application filed November 11, 1878. To all whom it may concern: Be it known that I, Thomas Alva Edison,of Menlo Park, in the county of Middlesexand State of New Jersey, have invented anImprovement i
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . Patented Dec. 9, T. A. Carbon No, 222,390. United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY, ASSIGNOR TO WESTERNUNION TELEGRAPH COMPANY, OF NEW YORK, N. Y. IMPROVEMENT IN CARBON-TELEPHONES. Specification forming part of Letters Patent No. 322,390, dated December 9, 1879 ; application filed November 11, 1878. To all whom it may concern: Be it known that I, Thomas Alva Edison,of Menlo Park, in the county of Middlesexand State of New Jersey, have invented anImprovement in Telephones, of which the fol-lowing is a specification. Thisinvention I term the micro-telephone,in consequence of the same responding to mi-nute vibrations of the instrument itself, trans-mitted to it hy any solid body or of the atmos-phere, and in so doing transmitting electricpulsations to a distance, where they can be re-ceived by an ordinary telephone. In the drawings, Figure 1 is a section of theinstrument, and Eig. 2 is a plan of the same. The box A is of a suitable size and shapefor holding the apparatus,
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