Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 61
theearth midway between its poles. So also, the magneticequator is an imaginary line encircling the earth midway between its magneticpoles (Fig. 56) andconnecting all thosepoints which show nomagnetic dip, or wherethe needle was foundto be horizontal (see11 52). This mag-netic equator is some-what… … Fig. 5a.—The Earths Magnetic Polesand Equator. hemisphere, and curve around over the surface of the earth,•entering again at the true S-pole. The lines of force act ona freely suspended magnet in such a manner, that it turnson its axis, until it lies as nearly as possible in the directionof the…
Electricity · Magnetism
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