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 78
ire instruments represents thepractical solution of the before mentioned defects. The mechanism is shown in diagram in Fig. 41. A wire A B of high resistance, low temperature VOLTMETERS AND AMMETERS. 55 coefficient and non-oxidizable metal is secured atone end to a plate C. It runs over a pulley… … Fig. 41. Current only flows in the portion of wrire .4 be-tween C and the pulley D where the coiled wireconnection is shown. When A is heated by current flow it expands,F taking up the slack, pulls ^4 round Dy and ro-tates D and E. 56 ELECTRICAL INSTRUMENTS. If a pointer were directly attached to…
Electric testing · Electric apparatus and appliances
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