Marked "Potts and Rittenhouse." 6" compass set in 13 3/4" sighting arm with sights 6 1/4" high. On walnut tripod. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Incomplete theodolite. Two fixed sight vanes are mounted to the horizontal circle, which is attached to the tripod assembly through the socket. Rotating compass and alidade with vernier blades in center. Signed "B. Chandlee Nottingham" along outer circle. Analysis of the alidade by a Scanning Electron Microscope in 2007 revealed that it contained silicon, most likely originating from a mixture of silicon bronze, a product that was not developed until the late 19th to early 20th century. Therefore, the alidade is not original to the piece.

Mahogany block with inset compass and cover. Possibly contemporary inked inscription, "Belonging to the globes presented by W. & S. Jones, 18 April 1800." (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).