Stackpole & Brother Sextant

Description
This sextant belonged to Columbia University in New York, and probably dates from the 1870s.The frame is brass. The silvered scale is graduated every 10 minutes from -5° to +175° and read by vernier with tangent screw and swinging magnifier to 10 seconds of arc. The inscriptions read "Stackpole & Brother New York" and "1765."
The sextant also has a small bubble level on the index arm. William Harkness, the American astronomer who introduced this feature, said that it "proved a very great convenience and saved much time and trouble."
Ref: "Report of Professor William Harkness, U.S.N.," in B. F. Sands, ed., Reports on Observations of the Total Eclipse of the Sun, August 7, 1869 (Washington, D.C., 1870), p.30.
Deborah J. Warner, "American Octants and Sextants: The Early Years," Rittenhouse 3 (1989): 86-112, on 108-109.
Location
Currently not on view
Object Name
sextant
date made
1870s
maker
Stackpole & Brother
Physical Description
mahogany (overall material)
brass (overall material)
silver (overall material)
glass (overall material)
Measurements
raidus: 6 in; 15.24 cm
place made
United States: New York, New York
ID Number
PH*335212
accession number
317998
catalog number
335212
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
Columbia University
Additional Media

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