Primitiae gnomonicae catoptricae, hoc est, Horologiographiae nauae specularis ... (1635)
Kircher, Athanasius, 1602-1680 · Auenione : Ex typographia I. Piot ... · leaf 115
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Sundials
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
