Abstract
MR. DARTNALL1 has recently described an interesting visual phenomenon which, as has been pointed out by Mr. Wright2, is connected with the after-images of different colours possessing different rates of development. A visual phenomenon possibly connected with this differential rate of development came to my notice some time ago, and no doubt must have been observed by others as well. A stroboscopic disk painted in black and white sectors is run under illumination from an (ordinary) Osram neon lamp connected to A.C. supply (60 cycles). At speeds such that the pattern is not stationary but somewhat shifting, the white sectors appear to be distinctly coloured (rainbow type)—one edge pink and the other green. The same effect is seen, though not so clearly, when the neon lamp is replaced by an ordinary incandescent lamp, provided the illumination is not high.
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