Shaw Octant

This octant was made during the period 1845-1876. It has an ebony frame and reinforced brass index arm. The ivory scale is graduated every 20 minutes from -2° to +107° and read by vernier and tangent screw to single minutes of arc. The "R. L. Shaw New York" inscription refers to Robert Ludlow Shaw.
Ref: Deborah J. Warner, "American Octants and Sextants: The Early Years," Rittenhouse 3 (1989): 86-112, on 108.
Anne Preuss and Don Treworgy, "Robert Ludlow Shaw," Rittenhouse 2 (1988): 65-69.
Currently not on view
Object Name
Shaw, Robert Ludlow
box: 4 in x 14 1/4 in x 13 in; 10.16 cm x 36.195 cm x 33.02 cm
octant radius: 11 in; 27.94 cm
place made
United States: New York, New York
ID Number
accession number
catalog number
Measuring & Mapping
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Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center

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