A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 826
es. At the magnetic poles the dip-needlesets vertically, with the N pole downwards at the north pole andthe S pole downwards at the south pole. Isodynamic lines.—Lines passing through points for which thehorizontal intensity of the earths magnetic field is the same arecalled isodynamic lines. The… … Fig. 739.—Magnetic condition of the earth. The earth as a magnet.—The cause of the earths magnetisationhas been the subject of a greatdeal of speculation. We shallhere content ourselves with say-ing that the magnetisation is notentirely due either to internal, orto external causes, but to both.…
Physics
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