Abstract
IN NATURE of August 11, 1921, p. 745, appeared my letter in which I criticised a result stated by Mr. Mallock in NATURE of June 9, p. 456; and also a further brief letter by Mr. Mallock. Further letters have appeared by Dr. Ball (January 5, p. 8) and Instr. Commander Baker, R.N. (January 5, p. 8, and January 26, p. 105). In his second letter Mr. Mallock says that “the pressure gradient near the ground, and the density and refractive-index gradients also, decrease linearly at such a rate that if the linear relation continues to hold, the pressure and density would be zero and the refractive index unity at height H.” This statement is incorrect as regards the density and refractive-index gradients, except in the special case when the temperature gradient is zero.
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DE GRAAFF HUNTER, J. Atmospheric Refraction. Nature 109, 549–550 (1922). https://doi.org/10.1038/109549b0
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DOI: https://doi.org/10.1038/109549b0
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