action of terrestrial magnet- then, I have often remarked ism. Such an arrangement the same phenomenon, was not deemed necessary which is one that anybody for the small model, because can easily observe, es- the influence of terrestrial pecially if his attention has magnetism is of no conse- been… … enough to give an idea of north-south position, points Fig. 2.—MAGNETIC BRAKE FOR SMALL MOTORS (LARGE MODEL), ) 1904 SCIENTIFIC AMERICAN, INC.
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