Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 492
g, ground return,and the line lamp is lighted in the usual manner. The current flow- 470 AMERICAN TELEPHONE PRACTICE. ing over the tip side of the line does not operate the magnet, f^in either direction because it is too feeble to do so. In response to the line signal the operator inserts an… … FIG. 344.—CIRCUIT OF SCEIBNER COIN-COLLECTING SYSTEM. between his line and that of the called subscriber by means of thecalling plug. When the called-for subscriber responds, the oper-ator, noticing the going out of the calling supervisory lamp, pressesthe key, K, which interrupts the conversation…
Telephone
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