W. & S. Jones Sextant

Description
The double-framed brass sextant was patented by Edward Troughton in London in 1788, and the form remained popular throughout the first half of the 19th century. This example belonged to Haverford College in Pennsylvania and may have been acquired when that school was founded in 1833. It has a silvered scale that is graduated every 10 minutes from -5° to +145° and read by vernier with tangent screw and swinging magnifier. The inscription reads "W. & S. Jones Holborn London."
Ref: Edward Troughton, "Framing to be used in the construction of octants, sextants, and quadrants," British patent #1644.
Location
Currently not on view
Object Name
sextant
date made
1800-1850
maker
W. & S. Jones
Measurements
box: 12 cm x 33.6 cm x 33.6305 cm; 4 23/32 in x 13 7/32 in x 13 1/4 in
overall: 10.8 cm x 28.3 cm x 28.3 cm; 4 1/4 in x 11 5/32 in x 11 5/32 in
place made
United Kingdom: England, London
ID Number
1981.0745.06
catalog number
1981.0745.06
accession number
1981.0745
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
Credit Line
Haverford College
Additional Media

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