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 115
nce the gray card to have become of a complementary tint. Thus if the tissue paper is orange in hue the gray card ring takes a bluish-peacock colour by contrast. But the persistence of impressions in the eye is notlimited to phenomena of colour. All ordinary visualimpressions last a perceptible… … impression before the first one has died away, the effectis the same as though both had been present at onetime. A familiar toy depending on this principle, andcalled the thaumatrope, consists of a bit of white card II VISIBLE SPECTRUM AND THE EYE 5 held between two strings on which it can be…
Light · X-rays
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