THE year 1868 is rendered memorable in the advancement of solar physics by the fact that the spectroscope was first used on an eclipsed sun. Up to that time the composition of the prominences and corona was unknown, although both these phenomena were then proved to be truly solar, the result of diligent systematic application of photography to eclipse problems since the year 1860.
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LOCKYER, W. Helium: Its Discovery and Applications. Nature 105, 360–363 (1920). https://doi.org/10.1038/105360a0