Terrestrial telescope consisting of six tubes. Five are made of wood and have octagonal sections. The sixth (the smallest) is made of cardboard and has a circular section. All are covered with red marbled paper. The biconvex objective is mounted in a separate tube that slides into the end of the largest draw tube. Both the lens and the ring enclosing it are inscribed "Eustachio Divini in Roma Palmi 12" (c. 2,700 mm). The smallest tube contains the compound eyepiece. The erector tube could be removed, converting the instrument into a simple astronomical telescope. The eyepiece lens and the front lens of the erector are now missing. The instrument's magnification is 44.