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 277
Fig. 2.517.—Moving element of Keystonethe_ movable coil, pointer, aluminum6prings, and counter weights. dynamometer instrument. The illustration showsair vane for damping the oscillations, controlling 1,796 HAWKIXS ELECTRICITY … Pig. 2.51V—Keystone dynamometer movement. Since the law governing this type of instru-ment is the law of current squares, it follows that in the case of voltmeters, equally dividedscales cannot be obtained. In the case of wattmeters, the scale is approximately equallydivided, due to the fact that…
Electrical engineering
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