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Published online by Cambridge University Press: 14 February 2012
During the past four years I have been developing a new method of measuring the velocity of light. I had intended to defer publication until the method was perfected, but progress is becoming increasingly difficult owing to war conditions. So I give here an account of the progress already made. I am certain the method has a great future before it. There is a notice of it in a letter to Nature (Houstoun, 1938), but except for this no description of the method has yet been given.