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 86

An illustration from 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, leaf 86 — the coloured one. Toobviate this the receiving screen is placed in a box,in the front of which a narrow aperture is cut justwide enough to allow the two beams to reach thescreen. An aperture is also cut at the front angleof the box, through which the observer can see thescreen. When this apparatus… … 84 COLOUR MEASUREMENT AND MIXTURE. diffused light in any measurable quantity presentwithin the box. The box, it may be stated, isblackened inside, and is us»ed in a darkened room.The mirror arrangement is useful, as any variationin the direct light also shows itself in the reflectedlight. Instead…

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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)

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