Octant by Spencer, Browning & Co., London, circa 1848

octant

INSTRUMENTS - OCTANTS
Spencer Browning & Co.
England, London
Circa 1848
wood; metal; ivory; glass
Overall: 12 x 9 3/4 x 3 in.

Ebony frame octant. Ivory nameplate marked, "Spencer, Browning & Co. London". Ebony limb; ivory scale marked, "SBR", graduated -20 deg. to 107 deg., by 1 deg. subdivided to 20'. Reinforced brass index arm. Ivory vernier. Adjustable index mirror with three fixed shades. Horizon glass w/thumb screw and lever adjustment. Sight vane double peep w/pivoted cover. Plate on the back of frame missing; ivory topped pencil in brace. English, ca. 1848.

1940.223