A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 530
Fig- SS°- B — Jf Telephone Circuit, … phone, in which the to-and-fro motions of thetransmitting diaphragm are caused to vary theresistance of a button of carbon, or a variable con-tact transmitter similar tothat employed by Reis insome of his instruments.The variable resistanceis placed in the circuit ofa battery, so that onspeaking…
Electricity · Electrical engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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