Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 219
Fig. 213.—The oscillograph. … Fig. 214.—Six-pole alternator. ment from the zero position c being proportional to the currentflowing, so that if a photographic film / is moved downward at aconstant speed a curve will be traced on it by the beam of light,which curve will be the wave of the e.m.f. applied at the oscillo-graph…
Electrical engineering
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