A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 502
of solar activity is unquestioned. Wolf,of Zurich, has shown by a comparison of nu-merous observations of sun spots, the unques-tioned correspondence, in the times of theirgreatest activity, which occur every n.i years,with the time of occurrence of an unusual numberof sun spots. He has placed… … Fig. 515- Wolfs Sun Spot Numbers. Storm, Thunder A storm during which electrical discharges accompanied bythunder take place between two clouds or be-tween a cloud and the earth. (See Elec-tricity, Atmospheric. Storms, Thunder,Geographical Distribution of) Storms, Thunder, Geographical…
Electricity · Electrical engineering
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