Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances (1918)
Keene, E. S. (Edward Spencer), b. 1864 · New York, McGraw-Hill book company, inc.; · leaf 353
to the joists. Thewires terminate in the push button P, where they pass throughthe frame of the front door. The wires are secured by staplesto keep them in place. Each wire is fastened separately to avoidthe danger of short-circuiting. If both wires are secured with asingle staple there is a… … FiG. 238.—Diagram showing the parts of an electric doorbell. nected, as shown in the figure, to the binding posts Pi and P2 ofthe vibrating mechanism, the push button PB serving to makecontact when the circuit is to be closed. When the button ispressed the circuit is complete from the + pole of the…
Heating · Lighting · Plumbing
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