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Fizeau's Experiment and the Principle of Relativity

Abstract

SIR JOSEPH LARMOR has kindly pointed out to me that it is incorrect, in the interpretation of Fizeau's experiment, to assume that the velocity of propagation of light is the group velocity, so that I must withdraw the conclusion drawn by me in NATURE of October 22, that Michelson and Morley's repetition of the experiment, when correctly interpreted, is in close agreement with the predictions of the principle of relativity. This being so, it may be worth while to direct attention to certain facts in connection with that experiment which render it quite inconclusive.

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CUNNINGHAM, E. Fizeau's Experiment and the Principle of Relativity. Nature 94, 226–227 (1914). https://doi.org/10.1038/094226d0

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