Terrestrial telescope consisting of seven cardboard tubes. The largest is covered with green paper with gold 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 separate little tubes that slide into the smallest draw tube. The compound eyepiece consists of three pairs of plano-convex lenses placed close together. All the lenses have 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.