This compass is 18 inches long with a 6 3/8 inch compass box and 6 1/2 inch sight vanes. The socket is a correct period replacement. The wooden box measures 18 1/2 inches long, 7 3/8 inches wide, and 4 inches high. The compass box bears the penciled words, "Wm. Bryson New Rochelle." Research indicates this would be the owner of the compass as Bryson is a documented architect and civil engineer located in New Rochelle in the 1850s. Survey maps of his are filed in the office of the Register of Westchester County (New York) and these surveys are now parts of North Pelham, New York.