Architectural Details of Stonework—Auxerre

American architect Arnold William Brunner's hand-drawn study of decorative stonework corbels and moldings from the medieval cathedral at Auxerre, France. The sketch employs cross-hatching to render three-dimensional form, with handwritten labels identifying architectural elements: base, abacus, and architectural terminology. This working drawing represents the 19th-century architect's practice of direct observation and documentation—essential methods for understanding historical building techniques before photographic reproduction became standard. Brunner's meticulous rendering captures both functional engineering and ornamental detail characteristic of French Gothic architecture.