Proctor, Richard A. (Richard Anthony), 1837-1888 · New York, A.C. Armstrong and son · leaf 107
s of Equal Dip. \!iit magnetic poles and lines ; in this place I merely notethat what is now said respecting them only refers to thepresent time. The formation of auroral streamers around the mag-netic poles of the earth shows that these light? ^re due THE AURORA BORE ALTS. 95 to electrical… … Fig. 10.—The Southern Magnetic Meridians and Lines of Equal Dip. may be regarded as an enormous magnetic instrument,a core surrounded by conducting matter, in which elec-trical currents pass whenever the condition of the earthsmagnetism changes. The discharges of electricity,though only visible at…
Astronomy
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