Church, A. H. (Arthur Herbert), 1834-1915 · London : Cassell · leaf 40
rotation, is painted in radial sectors with such opaque pigments as afford the nearest approximations to tlie principal colours of the spectrum. It is not neces- sary to employ a large number of pigments ; three, indeed, will suffice, namely, scarlet-vermilion, emerald-green, and ultramarine-blue… … be employed, including Fig. 8. orange, yellow, blue-green, and violet, the same final result will be obtained when, on rapidly rotating the disc, the successive impressions of the coloured sectors are mingled on the retina of the eye. A perfect white is not indeed produced, because all the coloured…
Color
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
