Folding arm protractor, 6 inch; brass, divided in half degrees on silver, reading by vernier to one minute of arc. Distance between points about 12 inches Folding arm protractor 1876
Folding-arm brass protractor by Troughton & Simms, London, in wooden case, mid 19th century. Folding-arm brass protractor by Troughton & Simms 1840-1860
Circular protractor by Edward Troughton, London, 9 inch with folding arms, divided on silver to 1/3 degree reading by vernier to 1-inch, engraved "Troughton, London" & "F^O 40", in case Circular protractor by Edward Troughton
Circular brass protractor, vernier arm with pricking extension, engraved "W & S Jones, 30 Holborn London", with glass centre piece, in box, B1754 Circular brass protractor 1800-1860
Circular protractor with two arms by George Adams, brass, in mahogany case (lid veneer lacking) Circular protractor with two arms by George Adams