Abstract
IT has been shown by Lord Rayleigh and others that the velocity (U) with which a group of waves is propagated in any medium may be calculated by the formula— where V is the wave-velocity, and the wave-length. It has also been observed by Lord Rayleigh that the fronts of the waves reflected by the revolving mirror in Foacault's experiment are inclined one to another, and in consequence must rotate with an angular velocity— where is the angle between two successive wave-planes of similar phase. When dV/d is positive (the usual case), the direction of rotation is such that the following wave-plane rotates towards the position of the preceding (see NATURE, vol. xxv. p. 52).
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GIBBS, J. On the Velocity of Light as Determined by Foucault's Revolving Mirror. Nature 33, 582 (1886). https://doi.org/10.1038/033582a0
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DOI: https://doi.org/10.1038/033582a0
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