Electricians' operating and testing manual; (1910)
Horstmann, Henry C. [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. H. Drake & co · leaf 254
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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