A treatise on photography
A treatise on photography by William de Wiveleslie Abney, published in London by Longmans, Green in 1878, is a technical manual for photographers and students of the chemical and optical process. Its pictures are line engravings of apparatus: a printing or copying frame with hinged cover, a ray diagram of a spectrum and lens path, a pair of lens mounts with adjusting screws, and a vertical wooden stand with a crank. A designer could draw on their fine hatched linework and precise labelled diagrams for scientific or vintage instructional graphics.
