Octant

Description
This octant has an ebony frame and reinforced brass index arm. The ivory scale is graduated every 20 minutes from -2° to +104° and read by vernier (without tangent screw) to single minutes of arc. A note written by Capt. H. Flynn of Lowell, Ma. in 1891 traces the history of this octant back to 1772. Stylistic concerns, however, suggest that the instrument was made in the early 19th century. The College of the Holy Cross in Worcester, Ma., donated it to the Smithsonian in 1965.
Location
Currently not on view
Object Name
octant
Measurements
radius: 9 3/4 in; 24.765 cm
overall: 12 in x 9 3/4 in x 3 in; 30.48 cm x 24.765 cm x 7.62 cm
ID Number
PH*326933
catalog number
326933
accession number
264083
subject
Measuring & Mapping
Navigation
See more items in
Medicine and Science: Physical Sciences
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Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
College of the Holy Cross
Additional Media

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