A box sextant, believed to belong to the pioneering Geologist Joseph Beetes Jukes (1811-1869)
by Troughton and Simms, London. Reading from 0 to 150 degrees on the silvered scale, the index arm fitted with a vernier to 30 seconds. Fitted with a sliding pinule sight and a separate telescope with bracket and two shades. The body engraved J.B.Jukes. In a leather carrying case. 2.7ins. (7cm)diam.