Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 467
Fie. 551.—The microphonetransmitter used in theBell system. 456 INDUCED CURRENTS At the back of the mouthpiece is a metallic diaphragmD, B 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… … Fi8. 552.—Electrical connections in telephone circuit. V, mouthpiece oftransmitter; B, B,, carbon buttons; D, diaphragm of receiver, and M itspermanent bar-magnet. T is a transformer. that the conductivity of the granular carbon varies with thevarying pressure exerted upon it by tlie button B, as…
Physics
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