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 52
A needle, free to move, takes up a position in the earthsmagnetic field with its magnetic lines parallel with, and inthe same direction as the earths lines of force. When amagnet is approached to it, it assumes a position which isthe resultant of the two forces now acting upon it. Xo effectis… … Fig. 47.—Needle Deflected Through Non-Magnetic Body. magnetising the iron plate by induction. The needle pro-duces a similar effect on the other side of the plate, and beingfree to move, deflects slightly, until its lines of force are pro-portionately accommodated between the earths magnetismand…
Electricity · Magnetism
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