Semicircular brass protractor by William Wilton, in original mahogany case; circle about 4 3/8" radius, divided in half degrees and reading by vernier to one minute of arc ( portion of lid (of case) broken at one hinge) Semicircular brass protractor by William Wilton 1825-1859
Semicircular glass protractor, by H Hughes and Son (B498; A200809 pt) Semicircular glass protractor 1851-1875
Protractor, semi-circular, by Watkins and Hill; diameter about 6 1/2", arm projects 6" beyond circle, engraved "Watkins and Hill, Charing Cross, London", "H.O.R." in case 14" x 5 1/4" x 7/8", mahogany Protractor, semi-circular, by Watkins and Hill; diameter about 6 1/2"