Dispersion in the Ether: Light over the Water

  title={Dispersion in the Ether: Light over the Water},
  author={Sir Brian Pippard},
  journal={Physics in Perspective},
  • S. B. Pippard
  • Published 1 September 2001
  • Physics
  • Physics in Perspective
Abstract. This is an account of measurements of the velocity of light by James Young (1811–1883) and George Forbes (1849–1936) around 1880 based upon an improved version of Fizeau's toothed-wheel method. They presented evidence for a dispersive effect resulting in a difference in the velocity of 1.8% across the visible spectrum. This conflicted with Albert A. Michelson's measurements and prompted discussions by Lord Rayleigh, Arthur Schuster, Léon Gouy, J. Willard Gibbs, and Paul Ehrenfest that… 
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