Géométrie descriptive
A French descriptive geometry textbook by Jules Pillet, published in Paris in 1899 by the Librairie des arts du dessin et de la construction, meant for students of technical drawing. The pictures are line diagrams in black ink on cream paper, with labelled points, dashed projection lines, and construction arcs drawn over axes. A designer could take from them the clean, precise linework of technical drawing and the way labelled construction lines organise a geometric figure.
