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 106
oloured paperbeing cut to shapeand pasted on) to bemixed are arrangedin two sets of narrowtriangles, as shown in the figure. When these arewhirled, one gets combinations in all proportions.For instance, if red and green are the two colourschosen, one end of the revolving surface is full red,the… … Fig. 51. 86 LIGHT lect. reddish owing to the greater relative prevalence of redwaves in artificial light. This change of apparent tintis similar to that observed in the rare gem called thealexandrite,1 which is green by day and deep red by night.Returning from the operations of colour-mixing…
Light · X-rays
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