Mahogany case for Wilton's brass protractor
Mahogany case for Semicircular brass protractor by William Wilton
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)
Mahogany case for Semicircular brass protractor by William Wilton
Semicircular brass protractor by William Wilton, 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)