Octant

John Hadley 1750

Portuguese Maritime Museum, a world of discoveries
Lisboa, Portugal

English-made octant that belonged to the Naval Academy. It has a diagonal scale to measure degree fractions, similar to the ones used in the first octants. This instrument was invented in 1730, and allowed for the measurement of angles up to 90 degrees.

Details

Title: Octant
Creator: John Hadley
Date Created: 1750
Location: Permanent Exhibition / Tall Ships Hall
Physical Dimensions: Diameter: 570 mm; Perimeter: 450 mm; Thickness: 80 mm
Type: Nautical Instrument
Rights: Belongs to the Museum

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