Riggs & Brother Sextant

Description
This sextant, which was probably made in England, has 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 the sextant to an American customer.
Location
Currently not on view
Object Name
sextant
date made
1865-1901
maker
Riggs & Brother
Physical Description
brass (overall material)
glass (overall material)
ebony (overall material)
Measurements
radius: 7 in; 17.78 cm
place made
United States: Pennsylvania, Philadelphia
ID Number
1989.0010.01
catalog number
1989.0010.01
accession number
1989.0010
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

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