Abstract
IT is now just forty years since the selective widening of Fraunhoferic lines in sun-spot spectra was first observed by Sir Norman Lockyer. Since then various papers relating to the same subject have been published by Sir Norman Lockyer, Prof. Young, and—more recently—Dr. Mitchell and Prof. Hale.
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Character and Cause of Sun-spot Spectra 1 . Nature 75, 113–114 (1906). https://doi.org/10.1038/075113a0
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DOI: https://doi.org/10.1038/075113a0