International Library of Technology · Scranton, International Textbook Co. · leaf 225
sist of three parts, namely,a casting of some kind that is held by the span wire orbracket, an ear that grips or is soldered to the trolley wire,and insulating material that separates the ear from thecasting. Fig. 7 shows a common form of suspension withthe ear removed; a is the main casting… … Fig. 7. is covered by a metal cap b. The ear to which the trolleywire is fastened screws on c.
Electrical engineering
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