Handbook of the practice and art of photography
A nineteenth-century photography handbook by Hermann Wilhelm Vogel, edited by Edward F. Molling, published in Philadelphia in 1875 for practising photographers and students. Its pictures are plain black-and-white line diagrams of optics: ray paths converging through lenses, a circular camera-obscura style view, and the geometry of focal points, rendered in thin hand-drawn strokes that suggest clear technical instruction a designer could borrow for scientific or diagrammatic motifs.
