Riggs & Brother Sextant

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.
Currently not on view
Object Name
date made
Riggs & Brother
Physical Description
brass (overall material)
glass (overall material)
ebony (overall material)
radius: 7 in; 17.78 cm
place made
United States: Pennsylvania, Philadelphia
ID Number
catalog number
accession number
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Data Source
National Museum of American History, Kenneth E. Behring Center

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