Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 651
irly long without prejudice to the action ofthe circuit. 643. Hughes Microphone.—In 1878 Professor Hughesintroduced what he called the microphone, which is really aform of telephone transmitter. Its action depended on aloose contact whose resistance varied with the soundsincident upon it. The… … Fig. 107.—Hughes Microphone. nails laid side by side, but not in contact, across which athird nail was laid. The effect is, however, better whencarbon pencils are used, and the apparatus employing carbonmay be regarded as the standard type of the microphone,and is with modifications still retained.…
Sound
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