Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 133
at its centerof gravity is somewhat below the center of suspension. Gravitythen is the restraining force. 552 HAWKINS ELECTRICITY The range of the instrument may be changed by hanging differentweights upon the needle. B3 increasing the number of blades the in-strument can be made to measure as low… … Fig. &40.—Thompson astatic instniment without cover. When cairrent passes through thecoils of the moving element, the lines of force parallel to the shaft produce a torque whichtends to turn the shaft and caxise the needle to travel across the scale. This action is. ofcourse, opposed by the…
Electrical engineering
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