Frodsham Sextant
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
- date made
- ca 1865
- maker
- Charles Frodsham
- place made
- United Kingdom: England, Liverpool
- Physical Description
- mahogany (overall material)
- brass (overall material)
- silver (overall material)
- glass (overall material)
- Measurements
- radius: 8 in; 20.32 cm
- overall: 4 15/16 in x 12 7/8 in x 11 1/4 in; 12.54125 cm x 32.7025 cm x 28.575 cm
- ID Number
- 1980.0318.03
- catalog number
- 1980.0318.03
- accession number
- 1980.0318
- Credit Line
- Vassar College
- See more items in
- Medicine and Science: Physical Sciences
- Measuring & Mapping
- Navigation
- Data Source
- National Museum of American History
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