A study of the spectral complementaries. I. Individual variations of the normal color-sense II.Subjective saturation of spectral colors..
A 1923 scientific dissertation by Roger Hull Sinden, published in Baltimore by Johns Hopkins University, studying individual variation in normal colour vision and the subjective saturation of spectral colours. The pictures are a schematic apparatus diagram of lettered light sources, prisms and a viewing field on squared paper, and a Johns Hopkins University library bookplate with a shield-shaped crest, useful for a designer wanting technical diagram linework or a formal academic ex-libris label.
