Colour measurement and mixture. Published under the direction of the Committee of General Literature and Education appointed by the Society for Promoting Christian Knowledge
A popular science manual on colour measurement and mixture by the physicist William de Wiveleslie Abney, issued in London and New York in 1891 by the Society for Promoting Christian Knowledge for general readers. Line-engraved figures show rotating colour discs divided into labelled sectors, spectrum luminosity templates, and gridded dispersion curves, built from flat black, hatching and stippled greys usable as geometric diagram patterns.
