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Sextant protractor or reflecting protractor, invented by Sir Howard Douglas in 1811, with Admiralty mark "B 81", in fitted wooden box, made by William Cary of London, c. 1850
Sextant protractor or reflecting protractor, invented by Sir Howard Douglas in 1811, with Admiralty mark "B 82", in fitted wooden box, made by William Cary of London, c. 1850
Sextant protractor or reflecting protractor, invented by Sir Howard Douglas in 1811, with Admiralty mark "B 83", in a box, and made by William Cary of London, c. 1850