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 526
onstruction for overhead trolley line systemsdiffers but little from other forms of railway construction, withthe exception of the bonding of the rail joints. With the use ofa ground return this is absolutely necessary to secure a con-tinuous metallic path, thereby reducing the resistance… … OTJ .•33.2 Ml* oo,oH > is passed twice through holes inthe rail on each side of a fishplate. At intervals the wire is leddirectly across the track and at-tached to the other rail, thuseffectively connecting the two railstogether. Copper wedges aredriven into the holes in the railsto effectually…
Electrical engineering
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