Ioannis Kepleri Sae. Cae. Mtis. mathematici Dioptrice, seu, Demonstratio eorum quae visui & visibilibus propter conspicilla non ita pridem inventa accidunt : Praemissae epistolae Galilaei de ijs, quae post editionem Nuncij siderij ope perspicilli, nova & admiranda in c¿lo deprehensa sunt : item examen praefationis Ioannis Penae Galli in Optica Euclidis, de usu optices in philosophia
Johannes Kepler's 1611 optics treatise, printed in Augsburg by David Franck, sets out scholarly demonstrations of how the eye and visible things behave, including the newly invented telescope, for mathematicians and natural philosophers. The pictures are plain line diagrams of geometric figures, rays, triangles and lenses lettered with capitals, showing how light paths bend and meet, which a designer might borrow as clean schematic linework for technical or scientific graphics.
