Le Gouvernail d'Ambroise Bachot, capitaine ingenieur du Roy : lequel conduira le curieux de Geometrie en perspective dedans l'architecture des fortifications, machine de guerre et plusieurs autres particularitez y contenues
Le Gouvernail by Ambroise Bachot, a French royal engineer, printed in 1598 for geometry students learning perspective and fortification design. The pictures are engraved plates of star-shaped bastion fortresses seen from above in bird's-eye perspective, with compass and dividers drawn in, showing how plan geometry becomes built form and offering designers strong diagrammatic layering of angled walls and shadow.
