Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 230
RAILWAY CONTROLLERS AND EQUIPMENT 219 ^ I faseand Sw/tc^ -G l/gf7tr?/ng/lrre6ter .^^ ^ 7dl/g/7tsanc/Pa/77p\^^c^//7gCo// M/ 7r/pp/ng^ <5y//tch\ … Fig. 377.—Wiring diagram showing method of connecting unit switches or contactors in a main circuit of an old equipment. 220 WIRING DIAGRAMS OF ELECTRICAL APPARATUS
Electric wiring
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