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Usage conditions apply
Octant with an ebony frame, reinforced brass index arm, and ivory name plate. The ivory scale is graduated every 20 minutes from -3° to +100° and read by vernier with tangent screw to single minutes of arc. There is also a back sight and a back horizon glass that could be used to measure angles greater than 90°. The radius is about 12 inches. An inscription reads "NORIE LONDON". John William Norie established a Navigation Warehouse in London in 1799. The firm traded as Norie & Co. in the years 1816-1839.
Ref: Gloria Clifton, Directory of British Scientific Instrument Makers 1550-1851 (London, 1895), p. 201.
Currently not on view
Object Name
date made
ca 1800
place made
United Kingdom: England, London
Physical Description
ebony (overall material)
brass (overall material)
overall: 12 in x 10 in x 3 1/2 in; 30.48 cm x 25.4 cm x 8.89 cm
ID Number
catalog number
accession number
Credit Line
Dorothy Bateman Beck
Sailing Ships
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Data Source
National Museum of American History
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