« Traicté universel de la Sphère materielle ou instrumentale ».
A manuscript treatise titled Traicté universel de la Sphère materielle ou instrumentale, dated 1601, held in a French reserve collection and covering astronomy, geography, geometry and arithmetic. Its pages are handwritten French notes and diagrams: a right triangle with lettered vertices, a compass-style circle marked with cardinal points, dotted sight lines to towns such as Ypres and Lierre, and a construction of arcs and lettered segments. A designer could take the hand-ruled diagrams, dotted lines and lettered labels as a model for clean technical linework and annotated plans.
