Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 491
urned more rapidly. Gray did not appear at first to understand the manner in whichthese receivers operated. Later, however, he attributed them to theslipping of the hand on the metallic surface due to the variations infriction produced by the current. He noticed an increase in the fric-tion… … Fig. o—Giays Telephone Receiver. transmitter that was able to transmit articulate speech, in 1878. Heobtained the necessary electro-motive force of the electrical currentsrequisite for the successful operation of the receiver by the use of aninduction coil. He points out in this patent the fact…
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