Abstract
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 alternating electric field, this has the property of acting as an intermittent diffraction grating. The light in the first-order spectrum is then interrupted two hundred times as rapidly as by Fizeau's toothed wheel.
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HOUSTOUN, R. A Measurement of the Velocity of Light. Nature 164, 1004 (1949). https://doi.org/10.1038/1641004a0
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DOI: https://doi.org/10.1038/1641004a0
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