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 539
leywire is carried over that of the main line to an anchorage on the farther side. 2,630 HAWKINS ELECTRICITY Signal Apparatus.—The selection of proper signal apparatusfor an electric railway is governed by many conditions: whetheithe system be single or double track, city, suburban, or inter-urban;… … Fig. 3,714.—Four track double catenary construction with bridge supports. In this construc-tion, the trolley wire is carried by two messenger cables supported on bridge of substantialconstruction sparring the tracks at intervals of 300 feet or more, as here shown. Thistype of construction…
Electrical engineering
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