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 62
roller bearings, by placing it between the unlike poles oftwo bar electromagnets so that its diameter and the axis ofthe magnets forni 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 cardboard and place it… … Fig. 58.—Ficli of a Magnetised Steel Sphere Representing Earths Field. have a typical representation of the magnetic Hnes of force surrounding 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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