Frodsham Sextant

Description
This sextant has a brass frame. The silvered scale is graduated every 10 minutes from -5° to +145° and read by vernier with tangent screw and swinging magnifier to single minutes of arc. The inscriptions read "Frodsham, Liverpool" and "2602." It came from Vassar College, and may have been used by the professor of astronomy, Maria Mitchell.
Ref: Gloria Clifton, Directory of British Scientific Instrument Makers 1550-1851 (London, 1995), p. 106.
Location
Currently not on view
Object Name
sextant
date made
ca 1865
maker
Charles Frodsham
Physical Description
mahogany (overall material)
brass (overall material)
silver (overall material)
glass (overall material)
Measurements
radius: 8 in; 20.32 cm
place made
United Kingdom: England, Liverpool
ID Number
1980.0318.03
catalog number
1980.0318.03
accession number
1980.0318
subject
Measuring & Mapping
Navigation
See more items in
Medicine and Science: Physical Sciences
Navigation
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Vassar College
Additional Media

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