Colour measurement and mixture
A late nineteenth-century scientific textbook on colour, written by Sir William de Wiveleslie Abney and published in London by the S.P.C.K. in 1891 for students of optics and colour theory. Its pages carry printed diagrams: absorption curves for coloured glasses plotted on gridded axes, and a shaded wedge-shaped colour template with fine radiating guide lines. A designer might borrow the plain grid-and-curve charts and the precise radial template geometry as clean, diagrammatic graphics.
