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Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 268
Fig. 438.—Open-circuit burglar alarm system. If the circuit is closed at any point, the burglar alarm is operated. MISCELLANEOUS INTERIOR WIRING 253 … Fig. 439.—Closed-circuit burglar alarm sj-stem. If the circuit is open at any point, the relajsclose switches in the main circuit and operate the alarm bell. See Standard Handbook, Section 18, for further diagrams. D. C. Lovelaet,F. G. S. Oo., Sueanvill©,California.Electric wiring
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