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 258
polarized relay,(see fig. 112). Whenthere is no current pass-ing through the coils ofthe electromagnet, themagnetized armature willstand between the poles of the electromagnet, being restrainedby two springs. When a current flows in one direction thearmature will be attracted by one pole ; and when… … Fig. 112. 256 MODERN ELECTRICITY which is used for a polarized relay, without interfering withthe working of the latter. Diplex telegraphy 205. In this method, it is necessary to employ one set ofinstruments which only work with a current sent in onedirection, and another set which works when a…
Electrical engineering
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