Nine inch ebony octant, London.
4 0 c m
 
35cm
actual image size: 27cm x 32cm

Nine inch ebony octant, London.

Richardson, Claire

© Science Museum / Science & Society Picture Library

Description

Navigational reflecting instrument made by J Smith (126 Wapping, London) of brass with ebony divided on ivory. An octant is used in surveying and in navigation to measure the angle between two objects. Octants were used by navigators to determine a ship's latitude by measuring the angle between the horizon and a celestial body, such as the Sun.
 

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Image Ref.

10424782
 

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