Abney, William de Wiveleslie, Sir, 1843-1920, Society for Promoting Christian Knowledge. General Literature Committee · London [etc.] Society for Promoting Christian Knowledge: New York. E. & J. B. Young & Co. · leaf 109
102 COLOUR MEASUREMENT AND MIXTURE. prism a small piece of the metal is substituted, using it as a reflecting surface, as can also the rays reflected from any surface which is bright and polished. In Fig. 18 the dotted curves show the luminosity of the spectrum reflected from the dif- ferent… … * I I o x. Gamboge. 2. Indian Yellow. 3. Cadmium Yellow. 4. Yellow Ochre. FIG. 20. These curves are derived by reducing the ordinates of curve V proportionately to the intensity curves. Thus at 49 brass reflects 77% of the light, and the luminosity of the white is 80. The luminosity of the light…
Color
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