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 352
hebell is to be sounded. The bell system is an open-circuit formof apparatus; that is, the circuit is not complete except duringthe time the bell is ringing. By pressing the push button thecircuit is closed and the electric current from the battery flowsthrough the magnet and causes the tapper to… … Fig. 237.—The in-tercommu nicatingtelephone. 342 MECHANICS OF THE HOUSEHOLD the push button and the connecting wires is shown a completedoorbell outfit. These parts may be placed in different parts ofthe building and connected by wires as shown in the Fig. 239.The bell is located at E, in the…
Heating · Lighting · Plumbing
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