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 52
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. No effectis produced by interposing a… … Fig. 47.—Xeedle Deflected Through Non-Magnetic Body. magnetising the iron plate b} 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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