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 45
nary lectureapparatus for throwing a spectrum on the screenis of too crude a form to be effective for the pur-pose we have in view; the purity of the coloursseen on the screen is more than doubtful, and thisalone unfits it for our experiments. If we wantto form a pure spectrum we must have a… … Fig. 6.—Colour Patch Apparatus. The accompanying diagram (Fig. 6) will give anidea of the apparatus we shall employ. On the usualslit Sx of a collimator C is thrown, by means of a COLOUR MEASUREMENT AND MIXTURE. 43 condensing lens L1? a beam of light, which emanatesfrom the intensely white-hot…
Color
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