International Library of Technology · Scranton, International Textbook Co. · leaf 229
t will be a never-ceasing source oftrouble, due to its throwing the trolley wheel off the wire.The position for the frog may be found by the methodshown in Fig. 15, where a and b are the main-line tracks,c and d the branch-line tracks, a b the main trolley wire,and t c the branch trolley wire. The…
Electrical engineering
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