Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 319
ween the poles of a permanent magnetand a soft-iron core at the center, as shown in Fig. 199.Two spiral springs serve to carry the current to and fromthe moving coil, and also control the amount of deflection.The current strength is directly proportional to the angleof deflection, and therefore the… … Fig. 199. most generally used for the measurement of alternatingcurrents, but serve equally well for direct currents. In themost approved formof this type of instru-ment the current tobe measured passesthrough a fixed coiland thereby magne-tizes a soft-iron vanewhich is pivoted andcontrolled by a…
Electric machinery
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
