Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 256
f an electromagnet a having a lightly pivoted arma-ture b, the movement of which is controlled by a little spring cwhich, when attracted, closes the local circuit, consisting ofbattery d and the recording register e. The armature of the relay always works regardless ofwhich direction the current… … Fig. 110. Open and closed circuits 200. The so-called open circuit working means the bat-tery is out of circuit when the line is in rest. The opencircuit working is used on almost all European lines andhas the advantage of not using the battery when messagesare not being sent. In the closed circuit…
Electrical engineering
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