Competitive papers on photography
A photography competition compilation published in London in 1893 by Hazell, Watson, & Viney, held by the Getty Research Institute, presenting technical papers for photographers and optics students. Its pictures are plain line diagrams: lens ray paths with a stop, and labelled geometric solids like cylinders with inclined cuts, lettered at the corners. A designer might take from them the clean, precise schematic style of late nineteenth-century technical drawing, with thin strokes and letter labels.
