Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 281
nder very favourable circumstances theaurora extends over the entire sky. The appearance ofan aurora is usually accompanied by a magnetic storm(Art, 145), affecting the compass-needles over wholeregions of the globe. This fact^ and the position of the CHAP. IV.] ELECTRICITY AND MAGNETISM. 263… … .Fig. 112 those of discharge in rarefied air (Arts. 292 and 294).Yet the presence of an aurora does not, at least in ourlatitudes, affect the electrical conditions of the lowerregions of the atmosphere. On September i, 1859, asevere magnetic storm occurred, and aurora wereobserved almost all…
Electricity · Magnetism
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