Colour : a handbook of the theory of colour (1916)
Hurst, George H. (George Henry) · London : Scott, Greenwood · leaf 78
he's apparatus for rotating the colour discs. In this appar- atus a variety of speeds may be obtained, varying from slow to very quick, by driving as may be desired, from the pulleys 1, 2 or 3 : if 3 be made the driving pulley, then a slow speed is obtained; if No. 1 is used, then a quick speed is… … FIG. 45. •gether, that is a white and not a green. The white may not, however, be quite pure, but may be more or less tinted with blue or green, because it is extremely difficult to proportion •exactly the blue and yellow in this method of working. A better plan is that devised by Maxwell, who took…
Color
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