A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 504
f 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 ii.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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