IN determining the velocity of light by Fizeau's toothed wheel, the number of eclipses per second cannot be made more than about half a megacycle. Thus the method requires great distances. In two ...
IN a letter in Nature, 142, 833 (1938), I described a new method of measuring the velocity of light in which Fizeau's toothed wheel was replaced by a piezo-quartz crystal. When placed in an ...
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