Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 542
OK COIL AUTOMATIC OPERATOR 1 1||||| ||||j||| CUTOUT ^KEY … L TYPEINDICATOR , -INf out/block INDICATIONWHEN5TAFFIS0UT STA^I^ N.INE wire STAFF INSTRUMENTSWITCHBOARD Fig. 3,717.—Wiring diagram of automatic operator system. By using the automatic operatorconnected as shown, it is possible to operate a staff block without an operator at eitherstation. Twenty…
Electrical engineering
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