The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 630
buttons, and intended to befastened to the end of a flexible cord. Switch,Throw-Over. A doublethrow knife switch designed to con-nect a three wire system in a build-ing either to a three wire streetmain or to a single source on thetwo wire system. The wiring forthis usage must have the neutralequal… … Fig. 387. Voltmeter Switch.
Electricity
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