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Nature | Vol.164, Issue.4180 | | Pages 1004-1004
A Measurement of the Velocity of Light
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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A Measurement of the Velocity of Light
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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