Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 218
Fig. 211. Fig. 212. Figs. 211 and 212.—Wave form of electromotive force. 226. The Oscillograph.—The shape or form of the e.m.f. waveof an alternator may readily be determined by means of an instru-ment called an oscillograph, the essential parts of which are shownin Fig. 213. In the narrow gap…
Electrical engineering
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