. American telephone practice . L. l&^r° 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 operated. In order to prevent the line signalat the private branch exchange being operated by current from theline generator, a differential line relay may be used, having onewinding in each limb of the line. Any current sent over the me-tallic circuit of the lin
. American telephone practice . L. l&^r° 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 operated. In order to prevent the line signalat the private branch exchange being operated by current from theline generator, a differential line relay may be used, having onewinding in each limb of the line. Any current sent over the me-tallic circuit of the line will, therefore, not operate this signal, andthus any subscriber on the line is enabled to call another the sameas on an ordinary bridging bell line. In order to enable any sub-scriber to call the private branch office a push button is providedwhich grounds the live side of the line, thus causing the operationof the line relay and the lighting of the signal. Such a line circuit as used by the Chicago Telephone Compan
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