International Library of Technology · Scranton, International Textbook Co. · leaf 279
ence hasproved, there will be no end of trouble from losing contactshoes. As a factor of safety, it is well to make the slottedlinks, by means of which the steel shoes are hung from thesteel rack, of gray cast iron, so that in case the passage ofthe shoe along the rail becoines obstructed for any…
Electrical engineering
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