Primitiae gnomonicae catoptricae, hoc est, Horologiographiae nauae specularis ... (1635)
Kircher, Athanasius, 1602-1680 · Auenione : Ex typographia I. Piot ... · leaf 51
I. 55 fenda eft fieri ob fortitudinem , firmitatem , feu duritiem corporistfed ob folius politura; virtutem, ficuti apparet in reflexione per aquam. Si porro detur corpus aliquid politum , Sc porofum fimul, lux id fubintrans non rcfle&etur , & fi eam refledti contingat , difpergetur , & difperfii… … tluni incide ntia:,& reflexionis non pofle confifle- F - .w
Sundials
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Directorivm generale vranometricvm : in quo trigonometriae logarithmicae fvndamenta, ac regulae demonstrantur, astronomicaeq[ue] supputationes ad solam ferè vulgarem additionem reducuntur : opus vtilissimum astronomis, geometris, arithmeticis, perspectiuis, architectis, praecipuè militaribus, mechanicis, geographis, nec non ipsis philosophis naturalibus (1632)](https://img.insideoutlibrary.com/img/200/ia-directorivmgener00cava-186-0.webp)
