10-inch radius ebony frame and limb octant

Estimate: $550 - $1,000

Lot Description

10-inch radius ebony frame and limb octant, c.1860, ivory plaque to crossbar marked 'Spencer, Browning & Co, London' (1840-70), ivory scale divided -2 to 107, brass index arm, ivory vernier divided 0-20, brass thumbscrew lock and adjustment screw, two pinhole sight vane with swivel shutter, shades and horizon glass on brass table, adjustment by milled screw and lever, capped pencil and recording plaque absent. Marked at the centre of the scale (at 47º) ‘SBR'. In mahogany box with Spencer, Browning & Co. (cautionary) label affixed. Provenance: The H.N.E Sheppard Estate Collection.