Colour vision, a discussion of the leading phenomena and their physical laws (1922)
Peddie, William · London, Arnold · leaf 97
ojection passes through 0, the slope of theprojection must always be positive. The ratio of the logarithms is unity if y^ and y.. bear to bthe same ratios as x^ and x.^ bear to or. This occurs only ifthe projection is that of the Principal Line. If the ratio ofthe logarithms is greater than unity,… … FiC4. 10.—Shortest Colour Lines. is less than unity, the projection is concave to the parallelto the y axis drawn through 0. The change from the onecondition to the other occurs when the curvature vanishes,that is, in the projection of the Principal Line. Further, if we take the point 1 as e, that…
Color
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