Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 204
it off the contactbutton shown, and thereby breakingits connection with the right-handspring. The left-hand spring is in-sulated, and in connection with thecalling subscribers wire, while theright-hand spring is earth-connected.When the operator has introducedhis plug, he replies to the… … Fig. 64.has statedhe wishes theto iS8 ELECTRICITY IJST MOlDERN LIF&. into the opening of the spring-jack corresponding to thesubscriber who is to be called, and presses a key, whichsends a current into the line, from a battery or othergenerator at the station, and rings the latter…
Electric industries · Electricity
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