Terrestrial telescope consisting of six wooden tubes. The largest is covered with green leather with gold tooling. The others are covered with cardboard and red marbled paper. The biconvex objective lens has a diameter of 65 mm and an aperture of 40 mm. It is signed on the glass and fitted in a boxwood housing. The second to fifth draw tubes contain diaphragms; the sixth (the smallest) has a little tube—a typical feature of Giuseppe Campani's telescopes—which can be inserted in only one way. This erector unit contains two biconvex lenses. The eyepiece consists of a third biconvex lens. The three lenses form the compound eyepiece and have the same focal length. Removing the erector converts the telescope from terrestrial to astronomical. The magnification is 36.