An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 155
78).But according to the lawof attraction and repul-sion between magneticpoles, the north-seekingpole of a compass must beattracted by the S-mag-netic pole of the earth.Thus it is that the S-mag-netic pole of the earth isnear the geographicalnorth pole and the N-magnetic pole is nearly opposite in… … Fig. 78. — The earth is a huge magnet withpoles. NATURE AND PROPERTIES OF MAGNETISM 131 was everywhere the same, until Columbus, on his way to Americain 1492, discovered near the Azores a place of no variation. Anexact knowledge of the variation at different places is evidentlyof the greatest…
Electricity · Magnetism
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