Traité de géométrie descriptive
A French textbook of descriptive geometry by Nicolas Breithof, published in Paris by Gauthier-Villars in 1880 for engineering and mathematics students. The plates are numbered line diagrams in fine hairline strokes on tinted paper: triangles, projection planes, arcs and dotted construction lines with lettered points, useful as technical linework, grid overlays, or abstract geometric pattern.
