An early to mid 19th century navigators Octant made by Cox, Devonport. with applied makers plate.

The Octant’s ‘T’ shaped frame is constructed from ebony with brass fittings and ivory scales. The arc scale is clearly engraved, reading from -5 degrees to 101 degrees. It is further divided into 20 minutes of arc and can measure angles of up to 90 degrees.

Cox is recorded as working from Devonport from 1830 to 1851