Tracés d'atelier et géométrie, tome 1 is a French monograph that explores the relationship between workshop practices and geometric theory. Drawing on historical examples from the 19th and early 20th centuries, the author examines how artisans and engineers used geometric principles to solve practical problems in construction, design, and manufacturing. The book blends rigorous analysis with illustrative case studies, offering readers a detailed look at the tools, diagrams, and mental models that shaped the craft of the workshop. It is a valuable resource for historians of technology, architects, and anyone interested in the visual and conceptual language that underlies the built environment.