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 21
DE REFRACT. LIBER I. 15 I, & videbitur brachium B I fumma peti in N, & paulo amplius deprimendo B, femper I eleuari videbitur , & tandem I ad O perueniet, fic deprimendo, fubleuandoque, voti demum com- … Satis tibimet ipfi vere facies , fi afirolabium ex pelui extra¬ hes, & regulam aliquam intra vasperpendiculariter ere&am coftitues,& in imo repones obiedlum valde relucens,inde ocu¬ los deprimendo, videbis coloratum per virgulam afcendentem perpendiculariter,ficfufiollendo deprimi . Clarioris…
Optics
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
