Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 282
ibrations of the enclosed air, and thus a sensationof sound. If the current passing through the receiveris an alternating one, the impulses in one direction willweaken the magnet and the impulses in the other wjllstrengthen it and produce the same result, but somewhatmore intensely. We will discuss… … Fig. 173. The transmitter T consists of a mouthpiece M^back of which is fastened a diaphragm similar to the onein the receiver ; back of this, and resting lightly againstits center, is a piece of platinum P, called the contact piece. 268 ELECTRICITY [§ 412 This rests, in turn, against a button of…
Physics
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