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Colour vision : being the Tyndall lectures delivered in 1894 at the Royal Institution (1895)
Abney, William de Wiveleslie, Sir, 1843-1920 · London : S. Low, Marston & Company · leaf 177
Colourless V ision. i6i maximum is made 100, as that of the normal eve, as it is therefore of red- and green-blind, and also of Fig. 40.Color vision
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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