Ripley Octant

Description
This octant has a rosewood frame, flat brass index arm, and ivory name plate. The ivory scale is graduated every 20 minutes from -5° to +95° and read by vernier to 2 minutes of arc. Caroline (Mrs. Alfred E.) Bates, a Washington socialite, gave it to the Smithsonian in 1916.
The inscription reads "Made by Thos Ripley London For Frans Earle July 21st 1784." Thomas Ripley was in business from 1765 to 1790, offering mathematical and optical instruments.
Ref: Gloria Clifton, Directory of British Scientific Instrument Makers 1550-1851 (London, 1895), p.233.
Location
Currently not on view
date made
1784
maker
Ripley, Thomas
place made
United Kingdom: England, London
Physical Description
wood (case material)
ID Number
PH.290534
catalog number
290534
accession number
59652
Credit Line
Caroline E. Bates
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Data Source
National Museum of American History, Kenneth E. Behring Center

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