Philippi Lansbergii Cyclometriae novae libri dvo ..
A 1616 Latin geometry treatise by Philippe van Lansberge, printed in Middelburg, on squaring and measuring the circle for mathematicians and scholars. Its pictures are red-ink construction diagrams with lettered points, lines, arcs and right-angled figures set on plain cream paper, offering a designer clean geometric linework and labelled schematic layouts.
