Achilles Pierre Dionis du Séjour - Parisian Academic, National Assembly (1789), circa 1790

Portrait of achille pierre dionis du séjour (1734–1794), french astronomer and mathematician engraved by courbe after perrin. Date: circa 1790. Dimensions: height: 21.5 cm (8.4 in); width: 13.5 cm (5.3 in). Medium: burin, lithograph. Collection: Bibliothèque nationale de France.