Oculus artificialis teledioptricus, sive, Telescopium : ex abditis rerum naturalium & artificialium principiis protractum novâ methodo, eâque solidâ explicatum ac comprimis è triplici fundamento physico seu naturali, mathematico dioptrico et mechanico, seu practico stabilitum ...
Johann Zahn's Latin treatise on the telescope and geometrical optics, printed at Würzburg in 1685 for scholars of dioptrics and instrument makers, with plates engraved in part by Bartholomäus Kilian. The pictures are letter-keyed ray diagrams in woodcut and engraving — spheres with hatched interiors, lenses, mirrors, cones of light — usable as line-based geometric motifs and lettered schematics.
