Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 377
Fig. 2-25. In Fig. 225 these lines are so drawn that any one of thempasses through all points having the same declination. Sucha line is known as an isogenic, or line of equal declination. In Fig. 226 each line of the system passes through allpoints which have the same dip. Such a line is called… … Fig. 226. 60 so o so .• :.: :_=■;
Physics
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