Church, A. H. (Arthur Herbert), 1834-1915 · London : Cassell, Petter, and Galpin · leaf 30
COLOUR. 24 mirrors (as shown in Fig. 5), and then these mirrors may be so adjusted that their separate images are superposed. In this case also a single white image is obtained. … Fig. 5- A less perfect mode of re-uniting colours so as to form white may be accomplished in the manner suggested by Newton. A disc (Fig. 6) is painted in radiating segments with the nearest approach afforded by pigments to the seven colours of the spectrum, the centre and edges being made black.…
Color
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