Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets (1907)
Schneider, Norman H. (Norman Hugh), Hargrave, Jesse · New York, Spon & Chamberlain; [etc., etc.] · leaf 203
temperature in Centi-grade degrees, t F the temperature in Fahrenheitdegrees. Then / C = H ~R X 252.K And t F = ^-^ X 423.K Testing for a Break in a Coil. Testing for abreak in a field coil of a dynamo or motor may bedone by simply connecting a bell and battery in 180 ELECTRICAL INSTRUMENTS. series… … Fig. 99. the bell. A lead may be taken from an electriclight circuit to replace the battery. And if nodefinite readings are desired an incandescent lampmay replace the voltmeter.
Electric testing · Electric apparatus and appliances
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