This instrument, dating to about 1805, is all brass, with stacking lenses and a solid lower base with an attached tilting mirror on a very small pillar arising from the center of the bottom disc. Its cylindrical case is covered in red leather. Like the others shown on this website, it has two pillars rather than the three as the original. This instrument is very similar if not identical to Bracegirdle's number 7/2 in the Science Museum (London).