The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 204
included in the tip-conductorcircuit, as shown at x b. It will be noticed that a condenseris included in the indicator circuit, and a magneto-generatoris attached to the extension instrument for signalling purposes.Fig. 205 shows the connections of the exchange junction SMALL SWITCH-BOARDS 179… … ^8 Fig. 206 speaking current is supplied from that battery which isconnected to the connecting cord used for joining the lines,the battery connected to the second line being disconnected.If an extension line is connected through to the main exchangethe cord in connection withthe junction line is…
Telephone
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