Abstract
THE proposition that “the course of a nearly horizontal ray of light in the lower part of the atmosphere is a circular arc having a radius of 14,900 geographical miles” has been stated by Mr. Mallock in a letter in NATURE of June 9, p. 456. Mr. Mallock states later on in the same communication that rays that are pointed a few degrees up or down will still be arcs of a circte of 14,900 miles radius.
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DE GRAAFF HUNTER, J. Atmospheric Refraction. Nature 107, 745 (1921). https://doi.org/10.1038/107745a0
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DOI: https://doi.org/10.1038/107745a0
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