. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . on is lessened, andthus weakens the electric current passing overthe line; but as the diaphragm returns to its 35normal position the ends of the arms are againdrawu toward each other, and increase thepressure on the carbon button,and the tensionof the electric current on the line is also in-creased. Thus all the sound-waves striking the 40diaphragm are translated into electric wavesof corresponding character as to pitch and am-plitude. I employ a flat carbon of the character repre-sented in other applications hereto
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . on is lessened, andthus weakens the electric current passing overthe line; but as the diaphragm returns to its 35normal position the ends of the arms are againdrawu toward each other, and increase thepressure on the carbon button,and the tensionof the electric current on the line is also in-creased. Thus all the sound-waves striking the 40diaphragm are translated into electric wavesof corresponding character as to pitch and am-plitude. I employ a flat carbon of the character repre-sented in other applications heretofore filed by 45me. I claim as my invention— The combination, in a telephone, of a dia-phragm, twospring-arms attached to the same,one of which is insulated, a carbon button be- 50tween the said arms, a contractile spring ap-plied to the arms, and the circuit connections,substantially as set forth. Signed by me this 4th day of August, 1879. THOS. A. EDISON. Witnesses: S. L. Griffin,Frank McLaughlin. V (No Model.) No. 257,677. T. A. EDISON. TELEPHONE. Patented May 9, United States Patent OfficEc THOMAS A. EDISON, OF MENLO TAEK, NEW SPECIFICATION forming part of Letters Patent No. 257,677, dated May 9, 1882. Application filed October IT, 1881. (No model.) Patented in England -Tune 15, 1878. { To all whom it may concern: Be it known tbat I, Thomas Alt a Edison,of Menlo Park, in tbe State of New Jersey,have invented an Improvement in Telephones,5 (Case No. 158 B,) of which the following is aspecification. This application is a division of my applica-tion No. 158, filed November 11,1878, and tbesaid division is made for tbe purpose of rating from said original application matterstbat are not in interference, and for separatingthe different features of invention into twoadditional applications. The present I termCase No. 158 B.[5 Letters Patent in Great Britain No. 2,39Gshow tbe present devices. Said patent was ap-plied for June 15, 1878, but the
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