International Library of Technology · Scranton, International Textbook Co. · leaf 437
ting has been done to determine the bestshape of wheel and the best composition of metal consistentwith long life of the wheel and trolley wire. Some wheelswear out sooner than others and some are harder on thetrolley wire than others. A wheel that is too soft will wearout very soon; on thd other… … Fig. 6. metal are best adapted to the overhead construction. Agood lesson can be learned from a careful observation ofworn-out wheels; some wheels wear out most in one placeand some in another; the same make and shape of wheelwill wear differently on different branches of the sariie road.If both…
Electrical engineering
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