Wright, Mark R., 1854- · London : Longmans · leaf 157
isogenicline. These curves are irregular. (See map, p. 149.) The earth as a magnet.—Manyof the phenomena in reference to thedipping, and the inclination of mag-netic needles, can be explained byimagining that a short thick magnetpierces the centre of the earth. Thismagnet if produced would cut… … Terrestrial Magnetism 149
Physics
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