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 33
f the other. If both needles are equallystrong, such a combination on being suspendedby a fine thread T or balanced on a point, wouldstay in whatever direction it was placed. Itwould be entirely unaffected by the earths mag- 10 ELECTRICAL INSTRUMENTS. netic field, one needle neutralizing the other.… … Fig. 7. current may tend to turn each needle in .he samedirection. Compensating Magnet. A compensating magnetis used with certain forms of galvanometers toneutralize the effect of the earths magnetism onthe needle. GALVANOMETERS. 11 It is generally of a curved form as in Fig. 7 atMf being mounted…
Electric testing · Electric apparatus and appliances
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