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 300
erminal of each push; thewire B, runs from the other terminals of the battery, throughthe bell, and thence to one terminal of each of the drop mag-nets Ml, M2, etc. The other terminals of each of the magnetsMl, M2, etc., and pushes 1, 2, etc., are connected as shown. HL JOHNSON H.D MARTIN 1… … Figs. 3,284 to 3,286.—Various annunciators. Fig. 3,284, automatic residence annunciator;fig. 3,285, elevator annunciator; fig. 3,286, hotel return call annunciator. 2,392 HAWKINS ELECTRICITY With this arrangement, the pressing of any push button does notaffect any of the other drops except the drop…
Electrical engineering
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