A solid sandstone tower with connected watch keepers quarters built in the early 1840s and designed by the Colonial Architect Mortimer Lewis. The tower is octagonal in plan having four levels and a basement store cut 10 feet into a solid rock. The topmost level has a cantilevered iron and timber catwalk and the metal pitched roof is surmounted by an observation fleche. Decoration is minimal but the form of the shaft with simple stepping, string courses and small panel oval and square windows is typical of restrained Colonial Georgian building work. It was also reported that the government stores already had a catoptric lens apparatus available that has been purchased in 1853.