Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 286
Fig. 234 … Fig. 235 a circuit to facilitate its being closed or opened. They may besingle-pole, double-pole, etc., depending upon the number ofcircuits that are interrupted when the switch is opened. Adouble-pole double-throw switch is shown in Fig. 236. Thisswitch is so constructed that the circuits are…
Electrical engineering
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