Colour vision; being the Tyndall lectures delivered in 1894 at the Royal Institute (1895)
Abney, William de Wiveleslie, Sir, 1843-1920 · New York, W. Wood & Co. · leaf 129
problem is solved, B B is a closed box 3 feet lonor and about 1 foot high and wide, having two similar apertures 1^ inch in diameter in the positions shown. The aperture at the side is covered on the inside Fro. 27. B B by a piece of glass a, ground on q both sides, and a tube T is in- serted, in… … white disc is fastened to it. A mirror, M, placed as shown, reflects the light scattered by the ground glass on to the screen S. The rotating sectors are placed where shown, and are in such a position that they can be readily adjusted by the observer. The patch of any desired colour of the
Color vision
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