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 536
Fig. 3,708.—Single catenary curve construction. In locating the bracket arms on poles andthe poles on curves, the effect of super-elevation and the lateral overhang of the cars orlocomotives must be allowed for, as well as the position of the current collector. Anchorspans should be placed at the… … Figs. 3,709 to 3,711.—Detail of bracket arm with steady strain. The bracket arm is con-structed of a 3 inch I-beam, the outer end of which is bent upward, to prevent the mes-senger cable falling if it should happen to become detached from the insulator. TheI-beam is secured to the pole by means of…
Electrical engineering
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