International Library of Technology · Scranton, International Textbook Co. · leaf 436
Fig … 4. The Iiarp is the name given to the fork that holdsthe trolley wheel and its axle; it also holds two contact springs s^ s, Fig. 5. In thisfigure, 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…
Electrical engineering
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