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 157
ero at a place near Cincinnati, O., and be-comes an easterly variation amounting to 20° E. in the north-west. It was discovered nearly a hundred years after Columbustime that if a compass needle is perfectly balanced so that itcan swing up and down as well as sidewise, its north-seekingpole in the… … equator there is no clip. The points at which the dip is 90°are the magnetic poles. The magnetic pole in the northernhemisphere was reached by Sir James Ross in 1831 and foundto be in longitude 96° 48 W., latitude 73° 31 N., or about 1400miles from the geographical north pole.In 1909 Shackletons…
Electricity · Magnetism
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