Octant

Octant

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Description
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.
Location
Currently not on view
Object Name
octant
date made
ca 1800
maker
Norie
place made
United Kingdom: England, London
Physical Description
ebony (overall material)
brass (overall material)
Measurements
overall: 12 in x 10 in x 3 1/2 in; 30.48 cm x 25.4 cm x 8.89 cm
ID Number
PH.334285
catalog number
334285
accession number
306664
Credit Line
Dorothy Bateman Beck
subject
Sailing Ships
See more items in
Medicine and Science: Physical Sciences
Navigation
Measuring & Mapping
Data Source
National Museum of American History
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