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Galileo Galilei 30
German and English terrestrial telescopes
Miscellaneous single lenses and lens housings
aberration ameter aper aperture stop biconvex lens biconvex objective braccia cardboard ring cardboard tube central thickness cm Cardboard cm long compound eye compound eyepiece covered with green covered with red diagram diame diaphragm erector unit Eustachio Divini Evangelista Torricelli extended eyelens ferrule focal length Francini Galileo Galileo Galilei Giuseppe Campani glass is clear gold-tooled decorations green leather instru instrument internal threads ivory largest tube lens cover lens housing lenses light magnification Maker unknown Diameter missing mm long objective end objective housing objective is contained ocular end ocular housing ocular tube pencil marks plano-convex PLANO-CONVEX LENS pound eyepiece rays red marbled paper refraction reinforcing rings retaining ring ring glued screwed shoulder slight green tint smallest draw tube smallest tube SPYGLASS surface taining TERRESTRIAL TELESCOPE tint and contains Torricelli tube contains tubes are covered tubes have pencil ture turned boxwood vellum wood wooden housing wooden ring