International Library of Technology · Scranton, International Textbook Co. · leaf 34
al otherfaults pertaining to commutators that will be taken up underthe head of Sparking. 19, Of course the most serious condition is to have acommutator that is poorly made and of poor stock. If themica and copper usedare not of the properrelative hardness, onewill wear down fasterthan the other,… … 20 OPERATION OF § 10 neighboring armature coils. If the mica bodies are toohard or too thick, the bars will wear in ruts and call for fre-quent turning down. The best combination for all-roundwork is made of soft, clear mica and hard-drawn copper.One practice of the day, and one that tends to…
Electrical engineering
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