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 85
50 the attraction is between two curvedarmatures and the two poles of an electro magnet. 62 ELECTRICAL INSTRUMENTS. This is purely magnetic attraction and is counter-balanced by the force of gravity, a spring, or anadjustable weight. The heating effects of current are used in Fig.51 where a coil of… … Fig. 49. Fig. 50. Fig. 51. ciple illustrated in Fig. 47, the lower end of thearmature working in a glass tube filled with oil.This steadies the moving system and renders itdead beat. The armature is not rigidly attachedto the pointer shaft, but has a flexible connectionof silk. The shaft itself…
Electric testing · Electric apparatus and appliances
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