egra illi conueniens per¬ pendiculi linea, lateribus Theca aquidiftet. Huiufmodi Thecam perpendiculanam, necco cum fupradacla Libella triangulo EGF, itautilli firmiter copuletur , cius vero puncta fiduciaha_j apprime relpondeant linea ( vt ante dicebam ) triangulum E G F, in duo aqualiter diuidenti… … QVia enim linea perpendiculi reda eft ad Horizontem, vtpote a Ze- nith , hoc eft a polo Horizontis , verfus centrum pendens, atque_> adeo cum eiufdem axe coincidens : &: quia infuper eadem li¬ nea perpendiculi per 4, 1 1 Elem. ad planum I K reda eft ; cum iuxta inf¬ trumenti fidem reda fupponatur…
Sundials -- Early works to 1800 · Horology -- Early works to 1800 · Perspective -- Early works to 1800 · Horology · Perspective · Sundials
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
