Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
agnet, when the battery connectionis again completed. The revolution is caused by the mutual repulsion, and then themutual attraction, betAveen the two opposite poles of the two magnets,as the connection is broken and the poles of the electro-magnet arereversed. The velocity with which the… … 400 ELECTRICITY. 780. Figure 59.—Cause of the earths magnetism.—If a metal ring be warmed at one point oniy, as with a spirit-lamp, no elec-trical effect is produced; but if the lamp be moved along the ring, anelectric current is set up, which traverses the ring in tlie same directionthe lamp has…
Physics · Astronomy
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