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 111
104 COLOUR MEASUREMENT AND MIXTURE. From curves such as these we are able to produce the colour of the pigment on the screen from the spectrum itself. This is a useful proof of the truth of the measurements made. To do this we must mark off on a card (Fig. 23) the absolute scale of the spectrum… … •55 S « 2 "= £ •£ 3 " 3 1 4 3 fL II If i. Indigo. a. Antwerp Blue. 3. Cobalt. 4. French Ultramarine. FIG. 22. circles at the various points of the scale from its centre. From the same centre we must draw lines at angles to the fixed radius corresponding to the various apertures of the sectors…
Color
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