Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 208
calling, to ascertain his wants. She theninserts the calling plug, P, into the jack of the called subscriber andpresses the button, K, thus connecting the terminal of the generator,G, with the two sides of the line of the subscriber called. It will be noticed that when the key, Ki is in its normal… … FIG. 167.—SWITCH-BOARD CIRCUIT FOR METALLIC LINES. When the key is depressed the springs break contact with the insideanvils, thus severing the connection between plugs, P and P, andimmediately afterward connect with the outside anvils forming theterminals of the generators, G, thus sending current…
Telephone
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