. Carnegie Institution of Washington publication. evidence, open to only one interpretation, proved the existence of magnetic fields in sun-spots, and strengthened the view that these are caused by electric vortices. This conclusion, in common with many others regarding the nature of sun- spots, could not have been obtained without the aid of the physical laboratory. A B I I • i 1 1 a b a b a. FIG. 22.—Effect of Nicol and Compound Quarter-wave Plate upon (-4) Lines of Spark in Magnetic Field and (B) Solar Line in Spectrum of Sun-spot, a Red Components; b Violet Components; middle line of Tripl
. Carnegie Institution of Washington publication. evidence, open to only one interpretation, proved the existence of magnetic fields in sun-spots, and strengthened the view that these are caused by electric vortices. This conclusion, in common with many others regarding the nature of sun- spots, could not have been obtained without the aid of the physical laboratory. A B I I • i 1 1 a b a b a. FIG. 22.—Effect of Nicol and Compound Quarter-wave Plate upon (-4) Lines of Spark in Magnetic Field and (B) Solar Line in Spectrum of Sun-spot, a Red Components; b Violet Components; middle line of Triplet shows in B but not in A. Let us see how the effect of magnetism on light is studied. We place our iron arc or spark between the poles of a powerful magnet (Fig. 29) and pho- tograph its spectrum. The lines behave in the most diverse way, some splitting into triplets, others into quadruplets, quintuplets, sextuplets, etc. One chromium line is resolved by the magnet into 21. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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