Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 117
Fig. 60. Fig. 6i. black. On revolving this disk, and viewing it by a sufficiently strong light, the arcs of some of the circles appear coloured. The rotation must be neither too slow nor too quick. On reversing the rotation the order of the colours reverses. The effect appears to be due to the…
Light · X-rays
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