Case for 6-inch circular protractor
Mahogany case for 6- inch circular protractor by John Troughton, c.1785
Six inch circular protractor by John Troughton, in mahogany case, c.1785
Mahogany case for 6- inch circular protractor by John Troughton, c.1785
Six inch circular protractor by John Troughton, c.1785