Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 264
■S77ap 3ioi^c/> snap •switch snap switch SB siuitc/f qId snap ic/ajy Fig. 421. QB ^ U Fig. 420. Fig. 420.—Lamps controlled from three or more points. Fig. 421.—Several groups of lamps controlled in individual groups and as a whole. This,type ot circuit is known as the burglar circuit, being… … Fig. 422.—Standard methods of joining electrical conductors. 250 WIELVQ: DIAGRAMS OF ELECTRICAL APPARATUS irf^ulaio? i775ic2aior\ insulator-6oJci??^-
Electric wiring
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