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 65
in themagnetic meridian, with one end pointing or dipping down-ward at an angle of about 70 degrees to the horizontal. Fig.64. Strike the bar several hard blows with a hammer, andthen test for polarity. The lower end will be found to possessa N-seeking pole, and the upper end a S-seeking… … magnetised and becomes N-seeking. The earths field ha*induced poles in the bar by induction, the hammer blowsimply assisting the molecules to turn around according to the molecular theory. In alike manner tests made witha compass needle on iron andsteel girders in buildingsunder construction, will…
Electricity · Magnetism
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