Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 377
Fig. 226. 60 so o so .• :.: :_=■; … 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…
Physics
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