International Library of Technology · Scranton, International Textbook Co. · leaf 436
isfigure, b is the harp proper;a, the axle; s, s, the twosprings on either side of theharp; and c, c, two cotterpins that pass through twoholes drilled into the endsof the axle and serve tokeep the axle in place. Ithas been the custom to maketrolley harps of brass, butmalleable iron is fast… … Fig. 5. ELECTRIC RAILWAYS. 25 to avoid catching in the line work when the trolley wheelflies off the wire. The selection of a good harp means agreat saving in poles, ropes, and overhead work. 5. Tlie Wlieel.—The trolley wheel is a device on whichmuch experimenting has been done to determine the…
Electrical engineering
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