10-inch radius ebony frame and limb octant

Estimate: $700 - $1,300

Lot Description

10-inch radius ebony frame and limb octant, ivory plaque to crossbar marked 'Josh Long, London', ivory scale divided -2 to 100, brass index arm, ivory vernier divided 0-20, brass thumbscrew lock and adjustment screw, two pinhole sight vane with swivel shutter, object mirror in copper frame, shades and horizon glass on brass table, adjustment by screw and lever with milled clamping screw, pencil absent, ivory recording plaque verso. In oak stepped box with Sydney instrument makers label affixed. Provenance: The H.N.E Sheppard Estate Collection.