Abstract
THE theory of special relativity is based on two main postulates, namely, the principle of relativity and the principle of the constancy of the velocity of light. If it is assumed that Maxwell's equations are correct and obey the principle of relativity, then the principle of the constancy of the velocity of light follows. The experimental evidence usually quoted in favour of the second principle is de Sitter's analysis of double stars. However, the principle has not been confirmed by experiments carried out in the laboratory using terrestrial sources. The need for such an experiment has been stressed recently by Dingle1. If the velocity of light is to have the same numerical value in all inertial frames then the velocity of light must be independent of the velocity of the source of light.
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