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It is pointed out that Einstein's postulate of the constant velocity of light is verified only indirectly by elementary·particle experiments leaning more or less heavily on present e lec tromagnetic theory, the latter being verified only for low velucities. Direct experiments can be explained by the ballistic theory of light if transparent media, such as gases, reradiate as a secondary suurce. A direct experi. nwnt with cuherent light rpAectcd from a moving mirror was performed ill vacuum better than 106 torr. Its result is consistent with the constant velocity of light.

Test of the constancy of the velocity of electromagnetic radiation in high vacuum