Materia photographica : a treatise on the manufacture, properties, and uses of the substances employed in photography
Materia photographica is an 1891 London treatise by Clement J. Leaper, published by Iliffe, aimed at photographers and chemists and covering the manufacture, properties and uses of photographic substances. The pictures are plain black-and-white line engravings of laboratory apparatus: flasks, condensers, wash bottles and stands drawn in clean outline with light hatching. A designer could take from them a crisp, technical diagram style suited to scientific or instructional graphics.
