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 24
r the current strength for a given periodof time are Recording Voltmeters, Recording Watt- XVI INTRODUCTION. meters, etc., according to the unit by which theirrecords are read. As the underlying principles of instruments be-longing to the latter class are mostly to be foundin those of the first… … Fig. 1. An ordinary mariners compass has a few turnsof fine insulated copper wire wound around itscase, a suitable gauge being No. 26 B. & S. or No.28 S.W.G. If current from a battery or other source besent through the coil of wire, the magnetic needlewill tend to turn at an angle to the wire…
Electric testing · Electric apparatus and appliances
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