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Colour vision : being the Tyndall lectures delivered in 1894 at the Royal Institute (1895)
Abney William de Wiveleslie Sir, 1843-1920, Royal College of Physicians of Edinburgh · London : Sampson Low, Marston · leaf 143
M onochroniatic Vision, 125 shows l^otli the extinction and the pei-sistency curves, and also the curve of Inminosity for the normal eye. Fig. 31.Color Perception
Internet Archive · Royal College of Physicians in Edinburgh · Public domain (published before 1931). Free to use for anything.
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