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 105
Fig. 50. II VISIBLE SPECTRUM AND THE EYE 85 a round disk (Fig. 50) with the colours desired to bemixed, either in semicircles, quadrants, or in any otherdesired proportion, and place them upon a whirlingmachine to see the effect. The arrangement which I now show offers an im-provement in several…
Light · X-rays
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