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 278
The angle through whichthe tortion head wasturned, being proportionalto the square root of theangle of tortion, the cur-rent strength in amperes isequal to the square root ofthe angle of tortion multi-plied by a calculated con-stant, furnished by themaker of the instrument. Ques. How is the… … Fig. 2,519.—Leeds and Northrup electro-dyna-mometer. It is a reliable instrument for themeasurement of alternating currents of commercialfrequencies. When wound with fine wire and used in connection with properly wound resist-ances, it is equally useful for measuring alternatingpressures, and may…
Electrical engineering
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