A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 662
an electric lamp, and conversely,on the approach of daylight and the consequentincrease of solar illumination, to turn off thelight. —A contraction for(See Switch, Double- Switch, D. B.— double-break switch.Break?) Switch, D. P. A contraction for double-pole switch. (See Switch, Double-Pole?) —A… … Fig. 581. Flush Key Switch. A form of flush switch is shown in Fig. 581in which a removable key, instead of the ordinary,fixed key, is employed for opening and closing theswitch. Swi.] 653 [Sys. Switch, Four-Way A term some-times employed in place of four-point switch.(See Switch, Pour-Point.)…
Electricity · Electrical engineering
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