International Library of Technology · Scranton, International Textbook Co. · leaf 88
if the turns are short-circuited on each other, the coilmay persist in heating and thus damage other coils. RHEOSTATS FOR TESTIKG PURPOSES. 101. When tests are being made on machines, someform of adjustable resistance is necessary in order to get avariable load. If the current to be handled is not… … Fig. 30. be made by slitting- a sheet of ordinary roofing tin intostrips, as indicated in Fig. 30, and attaching this sheet to awooden frame. Thestrips should be from•^ inch to f inch wide,and the sheet shouldbe slit to within^ inch on alternateedges, so that whenit is stretched outand held in…
Electrical engineering
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