Della geometria e prospettiva pratica
A geometry and practical perspective treatise published in Rome in 1771 by Benedetto Franzesi, attributed to Baldassarre Orsini (1732-1810). Its pages are numbered engraved plates of plane figures, with labelled geometric constructions that look like working diagrams for students and craftsmen. A designer could take from them the clean, schematic logic of technical line diagrams: lettered vertices, hatched fills, and compass arcs laid out on a plain page.
