Electricians' operating and testing manual; a hand book for men in charge of electrical apparatus, repair men, trouble men, lamp trimmers, and electricians generally (1916)
Horstmann, Henry Charles, Tousley, Victor Hugo, 1875- joint author · Chicago, F.J. Drake & co · leaf 258
hat is, the tendency of the pointer to swing backwardand forward on defleCtion is reduced to a minimum.The movable coil is wound on a copper frame. Whenon deflection of the instrument this frame moves acrossthe field of the permanent magnet, it cuts throughlines of force and a current is produced… … Figure 155 is a permanent magnet fitted with pole pieces of theshape shown in the figure, the pole S, S being shapedlike an iron washer. A coil, C, is attached to a shaftwhich turns in jeweled bearings. A pointer attachedto the shaft moves over a suitable scale. Current pass-ing through the coil C…
Electrical engineering · Electric testing
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