milliario competentem Ha prorpc-bebit perafla multiplicatione (em.diametrum Terra: ad pedes rcdaaara. Inven ?Z«atum hunc pedum numerum quadret, ducendo in fe ipfum, eveniet quadratum ,,n<iit-refpondens in trianguloreaangulo ACD lateri AD. item priori numero pedum fe-«nidiametfi Terra: addat fex… … « Quanto vifus eft «levatior aut res a fpeftabi-lis, tanto longiusvifus ex- tenditux. ■ Strabo 1 non potia-it videre naves m portuCar-tfeagtnis. ; Vifus ab-folute fer-tur in im-meafum» ctiam quadret , duccndo in fc ipfum : habebit quadratum lateris AC, quodrc&oangulo D fubftenditur, fubducatur…
Optics, Geometrical · Optical instruments
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