. Popular science monthly. spot spectrum are merely widened by the magnetic field, but others aresplit into separate components (Fig. 10), which can be cut off at will bythe observer. Moreover, the opportune formation of two large spots,which appeared on the spectroheliograph plates to be rotating in oppo-site directions (Fig. 11), permitted a still more exacting experiment tobe tried. In the laboratory, where the polarizing apparatus is so ad-justed as to transmit one component of a line doubled by a magneticfield, this disappears and is replaced by the other component when thedirection of th
. Popular science monthly. spot spectrum are merely widened by the magnetic field, but others aresplit into separate components (Fig. 10), which can be cut off at will bythe observer. Moreover, the opportune formation of two large spots,which appeared on the spectroheliograph plates to be rotating in oppo-site directions (Fig. 11), permitted a still more exacting experiment tobe tried. In the laboratory, where the polarizing apparatus is so ad-justed as to transmit one component of a line doubled by a magneticfield, this disappears and is replaced by the other component when thedirection of the current is reversed. In other words, one component isvisible alone when the observer looks toward the north pole of themagnet, while the other appears alone when he looks toward the southpole. If electrons of the same kind are rotating in opposite directionsin two sun-spot vortices, the observer should be looking toward a northpole in one spot and toward a south pole in the other. Hence the n6 THE POPULAR SCIENCE MONTHLY. Fig. 10. a, 1), spectra of two sun-spots. The triple line indicates a magneticfield of 4,500 gausses in a, and one of 2,900 gausses in b.
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