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 153
COLOUR DISCS 133 The discs should be of stout unglazed paper or of thin card, and should present even surfaces of coloration. Their centres should be pierced with a clean-cut hole the size of the spindle of the motor, and a cut should be made from the circumference to the centre as shown. This … amount of white light reflected from the black (which should be ivory black and spread as paint with the aid of the colourless size) must be de- termined, the measurement being that given by light falling nearly perpendicularly on the surface. The examination of the colours of the discs must be…
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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