Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 267
Fig. 435.—Double-contactpush button. 252 WIRING ^DIAGRAMS OF ELECTRICAL APPARATUS hell , ruT o i oio indicatoT Fig. 436. IM [ pus?? duitorj I ^ 4 \door^ope7?er m- Fig. 437. Fig. 436.—Wiring for bell and indicator with several pushes. Fig. 437.—Bell wiring for apartment houses. Bells are rung from… … Fig. 438.—Open-circuit burglar alarm system. If the circuit is closed at any point, the burglar alarm is operated. MISCELLANEOUS INTERIOR WIRING 253
Electric wiring
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