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 279
lockwise. As the armature moves in this di-rection the two way switch contactswith A, thus bringing into actionthe magnets F and G, causing a 2,370 HAWKINS ELECTRICITY clockwise swing of the armature. The object of the light spring is toinsure contact of the two way switch when the current is off;… … Fig. 3,248.—Elementary double acting bell, consisting of a centrally pivoted armature, foursymmetrically arranged magnets, and a two way switch as shown. In operation, mag-nets F G, and F G, are alternately energized. Assuming the current to flow firstthrough F G and then through GF.F and G will…
Electrical engineering
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