Traité De La Science Du Dessin: Contenant La Théorie Générale Des Ombres, La Perspective Linéaire, La Théorie Générale Des Images D'Optique, Et La Perspective Aérienne Appliquée Au Lavis: Pour faire suite À La Géométrie Descriptive: Planches
A plate volume from 1821 by Louis Léger Vallée, with engravings by Jean Adam, issued by Heidelberg University Library as a teaching treatise on drawing and geometry to follow descriptive geometry. The plates show construction diagrams of shadows cast by solids, linear perspective, and aerial perspective. A designer could take from them the clean line-and-wash method of showing light falling on arches, vaults and curved forms, with hatched shading built from measured projections.
