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 306
or an apartment house. Faults in Bell Circuits.—Faults, other than those caused byweak push and bell springs, dirty and loose contacts, and im-poverishment of battery current are generally due to crossed wires.or broken wires. Fig. 3,294 shows the method of making asimple test for a cross.… … 60 CYCLEI00-J25V. BELL FRONT DOOR PU5HBUTTON FlG. 3,293.—Diagram showing method of connecting a bell ringing transformer for ringinginter-phone bells and door bells. Dotted lines show wiring for door bell using samesource of ringing current.
Electrical engineering
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