. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . roller entering a perfora-tion in the paper, the electric pulsation or wavepasses over the line to the stylus b and makesa mark upon the chemical paper, and the vi-bration of said stylus causes no material differ-ence in the appearance of the mark made, be-cause the current is strong so long as the cir-cuit is closed, and it acts through said stylusthe same as though it were resting on the pa-per all the time. When the circuit is brokenat the transmitter, the surplus current whichremains on the line prevents this po
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . roller entering a perfora-tion in the paper, the electric pulsation or wavepasses over the line to the stylus b and makesa mark upon the chemical paper, and the vi-bration of said stylus causes no material differ-ence in the appearance of the mark made, be-cause the current is strong so long as the cir-cuit is closed, and it acts through said stylusthe same as though it were resting on the pa-per all the time. When the circuit is brokenat the transmitter, the surplus current whichremains on the line prevents this portion ofthe current passing to the chemical paper;hence the tailing is not made to the mark. I claim— A stylus for a chemical receiving-instrument,in combination with mechanism for communi-cating to such stylus a rapid vibration towardand from the paper, for the purposes set forth. Signed by me this 24th day of March, A. THOMAS A. EDISON. Witnesses: Geo. T. Pinckney,Chas H. Smith. T. A. or Automatic Telegraphs. No. 15 0,848. Patented May 12, United States Patent Office. THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELFAND GEORGE HARRINGTON, OF WASHINGTON, D. C. IMPROVEMENT IN CHEMICAL OR AUTOMATIC TELEGRAPHS. Specification forming part of Letters Patent No. 150,§48, dated May 12,1874 ; application filed January 15, 1873. Case 64. To all whom it may concern : Be it known that I, Thomas A. Edison, ofNewark, in the county of Essex and State ofNew Jersey, have invented an Improvementin Telegraphic Circuits, of which the folio wing-is a specification: It is well known that in the induction-coilof an electro - magnet or primary helix a sec-ondary current is induced or set up, and thatthis can be conveyed over a wire, and willpulsate with the primary current through themagnet-helix. In chemical telegraphs great rapidity canbe obtained upon short lines, while upon longlines the speed is rapidly diminished by in-creasing the distance. The cur
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