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 133
roiar^ with dynamo;3. Bridge. 2,226 HAWKINS ELECTRICITY Differential Duplex System.—This method employs arelay wound with two sets of coil, in each of which the currentflows in a different direction. Consequently, when two currentsof equal intensity are passed through the relay at the sametime,… … Fig. 3,074.—Diagram explaining the operation of a polarized relay. The relay consists essen-tially of a permanent magnet, electromagnet, and an armature arranged to vibrate betweena contact and a stop. The permanent magnet is of a curved shape as shown; at oneextremity is attached the…
Electrical engineering
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