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 112
e below theother, the rays being reflectedto the collimating lens L, bymeans of two right-angledprisms P, and two spectra are formed, one abovethe other. By placing the rotating sectors in frontof one of the sources, the intensities of the differentparts of the spectrum can be equalized and… … Fig. 27.—Collimator for com-paring the intensity of twosources of Light. tlO COLOUR MEASUREMENT AND MIXTURE. and the blue rays in gaslight. Gaslight onlypossesses about 20% of the green rays, whilst ofthe violet hardly 5°/0. On the other hand thelight which comes to us from the sky shows a…
Color
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