Ioan. Baptistae Portae neap. De refractione optices parte, libri nouem (1593)
Porta, Giambattista della, approximately 1535-1615 · Neapoli : Ex officina Horatij Saluiani : Apud Io. Iacobum Carlinum, & Antonium Pacem · leaf 218
do ne empha fis euanefcat,& in centro circuli conftitutus ad dextra reuol¬ uendo, videtur iridis crus fere re&um prope oculos. Commo¬ rans ruri multoties accidit eiufmodi vifionem cofpicere in iri¬ de d nube fa<fta,vt minus vigintiquinq; pafsibus d me longe ab- eftet.Multoties quoq; in quadam valle… … Efto aftrum A,centru iridis B, oculus vero C extra ce trum iri¬ dis, obliquum crus iridis DFG , eius diameter DBE, oculus C, refpiciens crus iridis FG, radij CFCG,fuis coloribus fplendet. Nec audiendi funt bla&erones , dicentes non effe neceflarium oculi,centru Solis, & iridis effe in vna linea. Et…
Optics
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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