Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 200
n in the conditions that would existwhen the operator was calling the subscriber at its sub-station, thegenerator, G, having been connected by the operator with the spring-jack of that line, thus also cutting off the annunciator or drop. It will be seen from this very elementary discussion that the… … FIG. 156.—SPRING-JACK. the line, thus changing the circuit of the line to include the operatorstelephone instead of the drop. Also by means of a plug and flexiblecord, the operator may connect the calling generator with a line,thus changing the circuit to include the generator instead of thedrop.…
Telephone
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