International Library of Technology · Scranton, International Textbook Co. · leaf 165
y from time to time.This effect may be shown by the dia-gram in Fig. 984. In («), n o representsthe direction and magnitude of theforce due to the earths field, and ii inthe direction and magnitude of theforce due to the controlling magnet. The resultant n s isthen the direction which the magnet of… … 1600 ELECTRICAL MEASUREMENTS. of nearly 180° to the resultant 11 s. If the controlling mag-net had not been used, there would have been a slight drift, but the use of the controlling magnet to lessen theeffective field very much magnifies the effect of any changein the direction of the earths…
Electrical engineering
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