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 457
ivot V, when it is allowed to re-engage witri.the wire in the opposite direction. 2,548 HAWKINS ELECTRICITY The Overhead Trolley System.—In this arrangementwhich is largely used in towns and cities, the current for themotors is taken from an overhead wire by means of a trolleywith grooved wheels,… … Fig. 3,506.—Pantograph trolley; view of motor car showing trolley raised. For use on highspeed roads operating at high pressures a pneumatically operated pantograph trolley hasbeen devised which can readily be raised or lowered by the motorman without leaving hiscab. In trains of several motor…
Electrical engineering
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