Emulsion processes in photography
A late nineteenth-century technical manual on photographic emulsions by William de Wiveleslie Abney, published in London in 1878 by Piper & Carter for photographers and chemists. The pictures are plain line engravings of laboratory apparatus: a two-vessel dropping device, a sooty-looking cloth bag on a rod, a tilted glass tube over a spirit lamp, and a tray holding a folded paper packet in liquid, all drawn with crisp hatching and labelled letters that suggest diagrams a designer could borrow for schematic or scientific layouts.
