Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 154
e talking instruments are in use. At first, hand switches were used to accomplish this result. Beforethe adoption of the battery transmitter, instruments were providedwith ordinary two-point hand switches, so arranged as to alternatelyclose the line circuit through either of two branches, one… … FIG. 106.-HAND-S\VITCH CIRCUIT. with either of the metallic buttons, i or 2. One side of the linecircuit is connected to the pivot of the lever, a, while button No. iis connected through the call bell, b, and generator, g, to the otherside of the circuit. Thus, when the switch lever is in the…
Telephone
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