Opvscvlvm de lineis rectis aeqvidistantibvs et non aeqvidistantibus
A 1603 Bologna geometry treatise by Pietro Antonio Cataldi on parallel and non-parallel straight lines, printed by the heirs of Giovanni Rossi for a scholarly audience. Its pages are dense with letter-labelled diagrams of crossing and transversal lines drawn in plain black strokes over faint printed text, offering a designer a clear study in minimal linework and labelled schematic structure.
