Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 388
ve-second intervals. Bat-tery current, however, finds no path, on account of the presence ofthe condenser. As soon, however, as the subscriber responds byremoving his receiver from its hook the current from the battery, orfrom the ringing generator, whichever happens to be flowing at thetime,… … FIG. 289.-KELLOGG TRUNK. CIRCUIT. subscriber is rung at short intervals until he responds without anyfurther attention on the part of the operator. While the system just described is termed automatic ringing,this term is not strictly appropriate, because the ringing key is oper-ated manually by the…
Telephone
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