Abstract
MR. C. T. WHITMELL (NATURE, September 1, p. 424) describes a method of producing coloured patches by means of a rotating disc, furnished with a ring of holes. It will be found that the phenomenon can also be produced by intermittent reflection. In the year 1881 I described in NATURE (vol. xxiv. p. 140) a method whereby colour patches of great brilliancy, due to intermittent illumination, were easily produced by viewing sun-light reflected from the polished spokes of a cycle wheel. The relationship between the colour given and the velocity of rotation was clearly marked, and the effects can be easily reproduced by means of the simple apparatus described. In these experiments, a counter was attached to the axle of the rotating wheel, so that the rate of rotation could be accurately determined at the time of observation. The rotation of the cycle wheel was maintained by means of a motor the speed of which could be easily varied. In connection with the phenomenon of the change of colour due to intermittent illumination, several papers of much interest have been published since the year 1882 by Dr. G. Burch, F.R.S.
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JERVIS-SMITH, F. Colours due to Intermittent Illumination. Nature 70, 505 (1904). https://doi.org/10.1038/070505d0
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DOI: https://doi.org/10.1038/070505d0
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