Abstract
MR. McLENNAN says (NATURE, Jan. 19, p. 83) that V + v = V is incompatible with common sense. Is P + ρ = P equally incompatible, where Ï is density: and is he forced to believe that the density of a mixture must always be greater than that of either of its components? Doubtless he will say, No. If he will consider very carefully why he thinks velocity, but not density, must be additive, he will probably arrive at a solution of his other difficulties.
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C., N. The Understanding of Relativity. Nature 123, 161 (1929). https://doi.org/10.1038/123161b0
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DOI: https://doi.org/10.1038/123161b0
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