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Visibility of the spectrum. The continuous line represents the average data of Gibson and Tyndall computed so as to refer to Abbot-Priest sunlight. The light, dashed lines indicate the range within which fall the measurements of the completely studied, normal observers in this investigation. The dotted line represents the sum of the cone primaries
A tentative set of cone primaries, designed to describe perfectly the data of colorimetric purity, of visibility and of hue discrimination,—and to describe approximately the data of complementary color luminosity and of color mixture.
Several sets of cone primaries designed for different purposes. The set
Least perceptible colorimetric purity as given by the average data of Priest and Brick wedde, as given from the complementary color luminosity data of Sinden, and as derived theoretically from the cone primaries
The individual measurements of least perceptible colorimetric purity by Priest and Brickwedde. Compare the range of individual variation shown here with the differences between measurements and theory. Note especially Priest’s measurements between 400 and 500
Hue discrimination as measured by Laurens and Hamilton for their own eyes, and as derived theoretically from
Excitation curves for sunlight. The set
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