Colour measurement and mixture. Published under the direction of the Committee of General Literature and Education appointed by the Society for Promoting Christian Knowledge (1891)
Abney, William de Wiveleslie, Sir, 1843-1920, Society for Promoting Christian Knowledge (Great Britain). General Literature Committee · London: Society for promoting Christian knowledge; New York, E. & J. B. Young & co. · leaf 85
One-half of the aperture is filled with awhite surface, and the other half with the vermilion-coloured surface. The light L (Fig. 13) illuminatesthe whole, and the rod R, a little over half an inchin breadth, is placed in such a position that it castsa shadow on the white surface, the edge of… … Fig. 12.—Rectangles of Whiteand Vermilion. COLOUR MEASUREMENT AND MIXTURE. 83 on the vermilion surface. Between R and L areplaced the rotating sectors A. The \frhite strip iscaused to be evidently too dark and then too lightby altering the . aperture of the sf^-v^_ ff\ ,sectors, and an R ^-^…
Color
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