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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 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
Quadrant
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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