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 79
n 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 shaft Eit would indicate on a scale the… … Fig. 42. The rotating of E therefore moves G and thesilk fibre rotates H and the pointer, thus magni-fying the movement of G. Any temperature variations will affect A Bequally, it is therefore self-compensating. VOLTMETERS AND AMMETERS. 57 The tension of F being slight, wire A B is notunder a heavy…
Electric testing · Electric apparatus and appliances
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