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Title: Octant by John Greenwood 1793

Accession Number: 1933.127
Type: octant
Maker: Greenwood of Providence
Place: USA, RI, Providence
Date: 1793
Description: Octant by Greenwood of Providence. Mahogany frame; ivory scale and inlay; brass on part of the arm and fittings. Horizon mirror cracked, one set of shades loose, no handle. Inlayed plaque on crosspiece engraved, "Made * By * Greenwood * Providence * 1793*/ I*Smellage*". Octant (or Hadley's Quadrant) was the first of the commonly used reflecting instruments for measuring the angular heights of sun and stars above the horizon. These angular measurements were required for determining latitude and longitude in celestial navigation.

Mystic Seaport Image ID m110625-01    Information regarding reproductions

Mystic Seaport Image ID m110625-02    Information regarding reproductions

Mystic Seaport Image ID m110625    Information regarding reproductions