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Colour-blindness and colour-perception (1909)
Edridge-Green, Frederick William, 1863-, University of Leeds. Library · London : Kegan Paul, Trench, Trübner · leaf 291
A, B, C, D, handles moving slides in front of the aperture E, the light heing reflected to the observer by the mirror F.Colour vision defects · Colour perception
Internet Archive · University of Leeds Library · Public domain (published before 1931). Free to use for anything.
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