Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 303
e. When one of the room pushesRl, R2, etc., is pressed, its corresponding bell is cut out and the circuit becomes similarto an ordinary annunciator circuit. taken that these wires are stretched taut, so that they will not be caughtand torn. Fig. 3,289 shows how dumb waiter wires should be… … Fig, 3,289.—Dumb waiter buzzer circuit. There must be as many wires inthis cable as there are floors in thebuilding plus an additional wire whichis to serve as the battery feed wire. An elevator wiring diagram isshown in fig. 3,290 which representsa four story elevator building with apush button at…
Electrical engineering
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