Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 467
F^G. 652.—Electrical connections in telephone circuit. V, mouthpiece oftransmitter; B, B,, carbon buttons; Z), 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 ^t by the button B, as…
Physics
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