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 63
ENT AND MIXTURE. and be drawn across a ring of wire some inch indiameter, or—what the writer prefers best—thestop of a photographic lens. A film will form andfill the aperture. The ring or stop may be placedvertically in a clamp, and a beam of light causedto fall at an angle of about 45 degrees on… … VIOLET GREEN RED Fig. 9.—Interference Bands. four or five feet. Instead of this large image, asmall image may be thrown on the slit of thespectroscope, by using a lens of a greater focallength, and if the beam be so directed that it fallson the axis of the collimator, a very fairly brightspectrum…
Color
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