Platinotype : its preparation and manipulation
A late nineteenth-century London manual on the platinotype photographic printing process, written by the photographic scientist William de Wiveleslie Abney with Lyonel Clark for working photographers. Its pictures are plain black-and-white line diagrams: ray-path sketches of lenses and a light source, a spectrum response curve, and graphs of print density against exposure. A designer might take from them the clean, schematic look of Victorian scientific diagrams, with dashed guide lines, bold labels and grid-ruled charts.
