Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 434
exchange work it becomes desirableto use party lines and to afford means for the different parties onthe line to call each other without calling the central office, or tocall the central office without calling the other stations on the line.This is often desirable in large institutions covering… … FIG. 311.—PRIVATE-BRANCH EXCHANGE PARTY LINE CIRCUIT—CHICAGOTELEPHONE COMPANY. calling between the various stations on the line. Thus each stationis provided with the usual common battery talking and call-receivingapparatus, and with a magneto generator adapted to be bridgedacross the line when…
Telephone
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