Dioptrice Horaria. Propofitio X L I X. Radius e quouis puntto fuperfciei Sphara per verticem Gnomo¬ nis dioptnct ita emijjus , vt ad axem incidentia rettus ftf propagatur irrefrattus in punttum diametraliter oppofttum ei ex quo emittitur . Sic iuxta fadta inprefatme hypothefixmaxis incidenti® A D;… … trum Spharri , cum in eo fit vertex Gnomonis per pofiul. d. Dico huiuf- modi radium , nullam in A refradtionem pati , fed irrefradtum propagari in pundtum diametraliter oppofitum ipfi B. Primo enim iuperficies vtri- que diaphano in contactu communis , Si per A incedens , qualifeunque ca
Sundials -- Early works to 1800 · Horology -- Early works to 1800 · Perspective -- Early works to 1800 · Horology · Perspective · Sundials
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