. The semi-centennial anniversary of the National Academy of Sciences, 1863-1913 . Fig. 7. The Fig. 8. Water-spout. THE SEMI-CENTENNIAL ANNIVERSARY 45 Thus we were led to the hypothesis that sun-spots are closelyanalogous to tornadoes or water-spouts in the earths atmosphere(Fig. 8). If this were true, electrons, caught and whirled in thespot vortex, should produce a magnetic field. Fortunately, thiscould be put to a conclusive test, through the well-known in-fluence of magnetism on light discovered by Zeeman in 1896. In Zeemans experiment a flame containing sodium vapor wasplaced bet
. The semi-centennial anniversary of the National Academy of Sciences, 1863-1913 . Fig. 7. The Fig. 8. Water-spout. THE SEMI-CENTENNIAL ANNIVERSARY 45 Thus we were led to the hypothesis that sun-spots are closelyanalogous to tornadoes or water-spouts in the earths atmosphere(Fig. 8). If this were true, electrons, caught and whirled in thespot vortex, should produce a magnetic field. Fortunately, thiscould be put to a conclusive test, through the well-known in-fluence of magnetism on light discovered by Zeeman in 1896. In Zeemans experiment a flame containing sodium vapor wasplaced between the poles of a powerful electro-magnet. Thetwo yellow sodium lines, observed with a spectroscope of highdispersion, were seen to widen the instant a magnetic field wasproduced by passing a current through the coils of the was subsequently found that most of the lines of the spectrum,which are single under ordinary conditions, are split into threecomponents when the radiating source is in a sufficiently intensemagnetic field. This is the case when the observation is madeat right angle
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