Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 62
Fig. 56.—The Earths Magnetic Polesand Equator. EARTHS MAGNETISM. 43 … Fij ;. 58.—FicH of a Magnetisedtteel Sphere RepresentingEarths Field. have a typical representation of the magnetic lines of forcesurrounding the earth, and called the earths field.51. The Magnetic Meridian—Declination.—Just as the geographical meridian is an im-aginary line, drawn on the…
Electricity · Magnetism
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