Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 378
Fig. 227. Still another svstem is shown in Fig. 228. in which theapproximately north and south lines are drawn so that they BIOTS HYPOTHESIS. 367 have at every point the direction of the horizontal compo-nent of the earths field. Such lines are known as magneticmeridians. It will be observed that… … Fig. 228. in the northern hemisphere is located 70.5° X.. 973 TV. Thesouth magnetic pole has never been reached, but it is be-lieved to be not far from 73° S.. 150° E. It is evident thatthey do not lie at the extremity of a diameter. 325. Biots Hypothesis. — Biot has suggested that themagnetic…
Physics
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