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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 312
E, controls the bell B2, and push F, controls the buzzer Zl. ELECTRIC BELLS 2,403 •sftfomfrftha MiM Wl WJEpI® ^lWMlWM a 12 13 16 17 18 K 19 10 15 20 21 22 23 24 25 Fig. 3,306.—Wiring diagram for 25 buzzers and 25 push buttons with ten wires. This instal-lation requires five batteries. Five of the… … e^j qA bA &\)& 0- ©^ €H ®T|<9 Fig 3307.—Wiring diagram for 25 bells and 25 push buttons with nine wires. This is theminimum number of wires that can be employed so that any push will ring the correspond-ing bell and no other. The diagram p^inly shows the connections. It will be noted… Electrical engineering
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