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 497
ternating current car equipment is provided witha retaining coil so designed that it will open when the motorcurrent is interrupted. Where alternating current and directcurrent trolley sections adjoin, a dead section is left between 2,588 HAWKINS ELECTRICITY the two for a length not exceeding a car… … Figs. 3,6 f3 and 3,644.—Westinghouse master controller. Fig. 3,643 view with cover removed;fig. 3,644 with cover in place. The master controller contains the usual power and reversehandles, mutually interlocked. Except for the smallest sizes of equipments, it is arrangedwith five notches in series…
Electrical engineering
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