Primitiae gnomonicae catoptricae, hoc est, Horologiographiae nauae specularis ...
Primitiae gnomonicae catoptricae is a 1635 treatise on sundials and catoptric (mirror-based) dialling by the Jesuit scholar Athanasius Kircher, printed at Avignon for scholars and instrument makers. Its pages are geometric diagrams in fine black line: circles, chords, and gnomon shadows drawn with dotted arcs, letter-labelled points, and dense radiating lines, which a designer could borrow as precise schematic linework for clock faces, dials, or technical diagrams.
