Abstract
WHILE Nature herself seems to delight in surrounding some questions with triple difficulties and mysteries almost inscrutable, there are other questions which she has made the easiest of the easy if men will only use the means which she has prepared. And amongst such easy questions, no more signal example can be quoted than the exact spectrum place, within very narrow limits indeed, of Angström's yellow-green aurora line, whenever any aurora at all appears.
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SMYTH, C. Reference Spectrum for the Chief Aurora Line . Nature 5, 324 (1872). https://doi.org/10.1038/005324a0
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DOI: https://doi.org/10.1038/005324a0