Astronomical Quadrant
Astronomical Quadrant
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- Description
- This portable astronomical quadrant, which resembles English instruments of the late eighteenth century, has a 12-inch radius, stands 17 inches high, and could be used for measuring star altitudes. It belonged to Andrew Ellicott (1754-1820), a surveyor/geodesist who ran the boundaries of several American states, and who probably made it for his own use. The lenses are original. Andrew Ellicott Douglass added the tangent screw in 1885.
- Location
- Currently not on view
- Object Name
- Astronomical Quadrant
- associated dates
- 1931 10 28 / 1931 10 28
- 1899 01 26 / 1899 01 26
- 1796 00 00 / 1796 00 00, 1890 00 00 / 1890 00 00
- user
- Ellicott, Andrew
- associated place
- United States: Arizona, Tucson
- United States: Arizona, Flagstaff
- Physical Description
- metal, brass (overall material)
- glass (overall material)
- original lenses. (container material)
- Measurements
- average spatial: 45.1 cm x 30.5 cm x 24.8 cm; 17 3/4 in x 12 in x 9 3/4 in
- overall: 17 5/8 in x 13 1/4 in x 13 3/8 in; 44.7675 cm x 33.655 cm x 33.9725 cm
- ID Number
- PH.152081
- accession number
- 116914
- catalog number
- 152081
- See more items in
- Medicine and Science: Physical Sciences
- Data Source
- National Museum of American History
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