De' contorni delle ombre ordinarie : trattato
A treatise on shades and shadows and descriptive geometry by Antonio Bordoni, printed in Milan in 1816 by the Imperial Royal Printing Office for students of drawing and engineering. The plates are engraved geometric constructions of arcs, circles and projected lines with lettered points. A designer could draw on them for construction grids, arc-based layouts and technical linework that reads as precise instructional diagrams.
