Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 376
is the horizontal component of the earths field, Mthe magnetic moment of the magnet, and Lmr2 the momentof inertia of the bar. Tallies of the magnetic constants in different localities, forthe year 1900, are shown in the preceding table. 324. Magnetic Charts. — A knowledge of the magneticcondition… … 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…
Physics
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