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 545
<< … Figs. 3,722 and 3,723.—Universal train annunciator. Fig. 3,722 shows annunciator equippedwith manual reset, and fig. 3,723, with magnetic reset. The indications dispWed by eithertype are shown in figs. 3,724 to 3,726. ELECTRIC RAILWAYS 2,637 arm in a plane at rjght angles to the track and mounted…
Electrical engineering
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