Contributions to photographic optics
A technical optics treatise by Otto Lummer and Silvanus P. Thompson, published by Macmillan in London and New York in 1900, aimed at photographers and optical scientists. Its pictures are line diagrams of lens paths and cross-sectional engravings of compound camera lenses with cut-away barrels, showing bold hatching and clear ray geometry a designer could adapt for schematic or mechanical illustration.
