Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 378
ypothesis. — Biot has suggested that themagnetic field of the earth couldbe roughly imitated by placing twomagnetic poles within the earth, asat N and S (Fig. 229), situated ata distance apart small compared tothe earths radius, on a line inclined20° to the geographical axis PP.The angde made bv… … 368 1IAGXETISM. magnetized sphere. The actual phenomena of terrestrialmagnetism are. however, much too complicated to admit ofexplanation by this simple assumption. 326. Variations of the Earths Field. — The magneticforces of the earth are subject to a variety of changes, whichmay for convenience…
Physics
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