On colour-sight and colour-blindness : in its relation to railway and sea signals : read before the Glasgow Philosophical Society, on March 5, 1879
An 1879 London monograph by the Glasgow ophthalmologist J. R. Wolfe, published by J. & A. Churchill, on colour-blindness as it bears on railway and sea signal lights, written for medical and scientific readers. Its single figure, Fig. 3, is a set of three stacked curves over the spectral letters R, O, Y, Gr, Bl, V, plotting how sensitivity to each colour varies across three conditions of vision. A designer could take from it the clean, hand-drawn engraving style of Victorian scientific diagrams, with its stepped baselines, vertical guide lines and labelled axes.
