Demonstrationes mathematicae, oder, Untersuchung derer mathematischen Warheit-und Unwarheiten : allwo von der Arithmetica, Geometria, Stereometria, Mechanica, Brenn-Spiegeln, Fortification und Trigonometria : gründlich gehandelt alles aus dem Fundament examiniret, bewiesen, und in allerhand nutzlichen und lustigen Fürgaben, mit darzu behörigen Figuren in Kupffer, der curieusen Welt vorgestellet wird
Demonstrationes mathematicae is a 1698 mathematics treatise by Christian Schessler, printed in Dresden for a curious general readership, covering arithmetic, geometry, mechanics, burning mirrors, fortification and trigonometry. Its single plate arranges numbered copperplate diagrams in rows: circular and arched geometric constructions at top, then ballistic trajectories, a tower and mountain sightlines, and small figures in the lower corners, offering a designer tidy schematic linework of early modern technical drawing with clear labels and simple figures.
