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 71
ght forthe rays denotedby the principallines given atpage 26, usingthis last coefficient for different air thicknesses.This is equivalent to giving the intensity of the raysof sunlight when the sun is at different altitudes. 68 COLOUR MEASUREMENT AND MIXTURE. The sun traverses the following… … 4000 500 5000 50* 6000 500 7000 609 Fig. 10. —Absorption of Rays by the Atmosphere. very nearly setting. Bougier and Forbes havecalculated that the extreme thickness of the COLOUR MEASUREMENT AND MIXTURE. 69 atmosphere, traversed by its light when the sun ison the horizon, is approximately 35 £…
Color
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
