Sextant

Sextant

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Description
Sextant with a double brass frame of the sort introduced by Edward Troughton in London in 1788. The silvered scale is graduated every 10 minutes from -5° to +155° and read by vernier with tangent screw and swinging magnifier to 10 seconds of arc. The "Riggs Brothers, Philadelphia" inscription came into use in 1865, and probably refers to the firm that sold instruments of this sort to American customers.
Location
Currently not on view
Object Name
sextant
place sold
United States: Pennsylvania, Philadelphia
Physical Description
brass (overall material)
glass (overall material)
ebony (overall material)
Measurements
radius: 7 in; 17.78 cm
overall in case: 5 1/4 in x 11 in x 10 1/2 in; 13.335 cm x 27.94 cm x 26.67 cm
ID Number
1989.0010.01
catalog number
1989.0010.01
accession number
1989.0010
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Data Source
National Museum of American History
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