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Octant, circa 1840
octant
INSTRUMENTS - OCTANTScirca 1840
wood; metal; ivory; glass
overall: 11 3/4 x 9 3/4 x 3 in.
Octant, ebony frame, reinforced index arm, maker unknown, with inlaid elephant ivory scale, vernier, and unengraved nameplate in brace. Scale graduated from -2 to +100 deg. With brass tangent screw, index mirror, horizon glass, 3 shades, and sight vane with triple peep. Inlaid plate missing from reverse. Threaded pencil hole in brace. Radius from pivot to center of scale 9 1/2". Dated ca. 1840.
1985.90