Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 239
theswitch arm is held in the full-on position bythe electromagnet A, the winding of whichis in series with the field, and that shouldthe supply pressure fail, or the field circuitbe broken for any reason, the contact armwill be at once drawn back to the off posi- 522 Switch tion by the action of…
Electrical engineering
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