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2552 V.27 Terrestrial telescope 1660-1670 Eustachio Divini Cardboard, paper Length circa mm 3800 |
Description Terrestrial telescope consisting of seven sections. All the tubes are of cardboard: the largest is covered in green paper with gilt tooling, the others in red marbled paper. The objective, now missing, was inserted into the largest tube. The eyepiece and the erector are contained in small separate tubes which slide in the smallest section: the composite eyepiece consists of three pairs of plano-convex lenses placed close together. Every lens has a focal length of 150 mm; the focal length of every pair is therefore 75 mm. This telescope was built by Eustachio Divini in the 1660s, probably for experimental purposes. |
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