MESSRS. Payman and Woodhead appear to have misunderstood the method described in our letter in NATURE of Dec. 27, p. 994. We made no claim to originality of application of the principle of light interception. Our method does not depend on shadow or ordinary photography, which has been used in ballistics since the time when Boys took his first shadow photographs in 1893, and differs from that used in other optical chronographs (see, for example, Cranz, “Experimented Ballistik”, 3, chap, ii., 1927), of which Kampé de Fériet's is one.
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TAYLOR, J., WARK, R. Determination of the Velocities of Projectiles by the Method of Light Interception. Nature 127, 200 (1931). https://doi.org/10.1038/127200a0