Researches in colour vision [electronic resource] : and the trichromatic theory (1913)
Abney, William de Wiveleslie, Sir, 1843-1920, Parsons, John Herbert, Sir, 1868-1957, donor, Institute of Ophthalmology, University College, London. Library Services · London : Longmans, Green and Co. · leaf 121
\ s. '■■ x % \ 3 V _ be seen, with one ray, viz. that at scale number 46'3,
Ophthalmology · Eye · Color vision · Color Perception
Internet Archive · UCL Library Services, University College London (UCL) · Public domain (published before 1931). Free to use for anything.
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