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 183
he otherin the violet. If we place in front of the slits a disccut out with equal angular apertures (Fig. 39), theslit Si will be covered when the slit S2 is open, l8o COLOUR MEASUREMENT AND MIXTURE. and vice versdy and the two will never be uncoveredat the same time when the card is turning round… … Fig. 39.—Disc to cause alternate opening and closing of two Slits. screen on the same place in rapid succession, andthe effect on the eye should be precisely the sameas if the disc was not there, save in the matter ofintensity. Applying this artifice experimentally tothe two slits which were used…
Color
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