Tractatus de usu proportionatorii sive circini proportionalis : cum tabulis constructionum et usu lineae munitionum, vulgo fortificatoriae, pro delineandis figuris regularibus et irregularibus nec non operibus campestribus et externis cum figuris aeneis
A 1656 Latin treatise by Nikolaus Goldmann, printed by Philippi de Cro-y, explaining the proportional compass and fortification line for surveyors, engineers and draughtsmen. The pages are dense copperplate geometry diagrams: labelled triangles, polygons, circles, and tangent tables set out as numbered problems. A designer could draw on their rigid, precise constructions and lettered diagram layouts as a source of geometric motifs and compass-and-ruler linework.
