Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 467
i«. 551.—The microphonetransmitter used in theHell system. 456 INDUCED CURRENTS At the back of the mouthpiece is a metallic diaphragmZ), _S is a carbon button attached to the diaphragm, and Banother carbon button attached to the frame of the instru-ment, opposite to B. The space between the carbon…
Physics
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