Manuel pratique de photographie au charbon
A French practical manual on carbon printing, published in Paris by Gauthier-Villars in 1900 by Edouard Belin, aimed at photographers working with the carbon process. Its pictures are plain line diagrams of optical and camera setups, with dashed ray lines, lenses, bellows-style boxes, a tripod camera and a brick wall, useful to a designer wanting schematic technical drawing with clean linework and a restrained, instructional look.
