Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 61
here, such as is usedin roller bearings, by placing it between the unlike poles oftwo bar electromagnets so that its diameter and the axis ofthe magnets form a straight line. When plunged into filingsthe poles are readily observed. Cut a hole, equal to the di-ameter of the ball, in a sheet of… … -71 ~ Fig. 56.—The Earths Magnetic Polea and Equator. EARTHS MAGNETISM. 43 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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