On the effects produced by mixing white with colored light
Ogden N. Rood's 1880 scientific paper on colour theory, published in New Haven or thereabouts, written for physicists and students of optics studying how white light mixes with coloured light. The single picture is a triangular colour diagram with spectral hues marked along the base and a central white point, showing how mixtures of hues combine. A designer could take from it the logic of a colour wheel or triangle built from hue positions and a neutral centre point.
