Traité de perspective linéaire : précédé du tracé des ombres usuelles (rayon à 45 degrés) et du rendu dans le dessin d'architecture et dans le dessin de machines
A French treatise on linear perspective and shadow casting by engineer Jules Pillet, published in Paris in 1901 for architects, draftsmen and mechanical designers. The four plates use construction lines, not finished renderings: a perspective cube with a sectioned prism, a grid-based elevation of a vaulted arch, a dome section with labelled radii, and a plan showing projected points on a horizon line. A designer could borrow the clean, labelled geometric diagrams as a model for technical line work or for teaching-style construction layouts.
