Octant made by Spencer, Browning & Rust, London, England, circa 1840

octant

INSTRUMENTS - OCTANTS
Spencer, Browning & Rust
England, London
circa 1840
radius 10-3/4 in.

Octant from CHARLES W. MORGAN. Ebony frame, unreinforced bronze limb, inlaid ivory scale (warped) graduated -2 deg. to +104 deg. by 1 deg. subdivided to 20 deg., ivory vernier, tangent screw, adjustable index mirror w/3 fixed shades horizon glass w/thumb screw & lever adjustment. Sight vane w/double peep w/pivoted cover. Ivory name plate and ivory plate on back of frame is missing. Stamped on ivory scale: "SBR" (between 50°-55°); made by Spencer, Browning & Rust, London, dated ca 1840.

1984.119