Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 70
s of a fan or form an arch across the northern sky,as shown in Fig. 156. But, as seen in this country, itmore often appears as a few streamers of a pale tint.Similar lights are seen in south polar regions and arecalled aurora australis. The atmosphere, in its upper strata, is highly rarefiedand… … FiG. 156. ance of an aurora is generally accompanied by a ^ mag-netic storm or irregular disturbance that affects all ofthe compass needles over a considerable part of the earth. 371. Apparatvis and Experiments. — It is neither necessary nor very desirable that all of the follow-ing experiments be…
Electricity · Magnetism
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