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Circular protractor

Circular protractor

Circular protractor

Circular protractor

1753-1785
One of two brass 6-inch circular protractor

One of two brass 6-inch circular protractor

1876
Beck's patent protractor; brass

Beck's patent protractor; brass

Circular protractor 7 7/8 inch

Circular protractor 7 7/8 inch

1751-1773
6-inch circular protractor

6-inch circular protractor

John Troughton's six inch circular protractor

John Troughton's six inch circular protractor

1765-1770
Circular Protractor

Circular Protractor

1816-1850
Circular protractor, engraved: 'Dollond London'

Circular protractor, engraved: 'Dollond London'

Ivory protractor engraved: 'W & S Jones...', with vernier arm and glass centre piece

Ivory protractor engraved: 'W & S Jones...', with vernier arm and glass centre piece

1800-1860
Bullock's circular protractor, 6 inch, divided on silver to 1/2 degree, reading by vernier to 1', with tubular radial arms; engraved "Thomas Jones, 62 Charing Cross, London" and "R.109", in case

Bullock's circular protractor

1816-1850
Beck's patent protractor; brass; in mahogany case 13 3/16" x 4 1/2" x 1 5/8"

Beck's patent protractor

Ten-inch brass circular protractor by Ramsden in mahogany case, 10 1/4" x 10 1/4" x 1", divided to 1/2 degrees, reading by vernier to one minute, engraved "Ramsden, London", and "R.S.61 ", paper label on lid, "Royal Society 61"

Ten-inch brass circular protractor by Ramsden in mahogany case

1762-1800