Abstract
THE RELATIVE VELOCITY OF BLUE AND YELLOW LIGHT.—Allusion has already been made in this column to Prof. Harlow Shapley's proof of the practically perfect identity of speed of light of all colours, based on observations of the variable stars in the globular clusters. The proof is given in detail in Proceedings of National Academy of Sciences, Nov. 1923. Inspection of, the photographic and photo-visual light curves shows that the best phase to select for comparison is the passage through median magnitude on the ascending portion of the curves; the ranges of variation are different for the different colours, but the curves intersect in the middle of the ascending portion.
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Our Astronomical Column . Nature 113, 206 (1924). https://doi.org/10.1038/113206a0
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DOI: https://doi.org/10.1038/113206a0