Octant

Description
This octant has an ebony frame, and flat brass index arm with floral design. The ivory scale is graduated every 20 minutes from -5° to +95° and read by vernier with tangent screw to 2 minutes of arc. There is also a back sight and a back horizon glass that can be used to measure angles greater than 90°. This instrument was probably made in the late eighteenth century. It belonged to the College of the Holy Cross in Worcester, Ma.
Location
Currently not on view
Object Name
octant
Measurements
radius: 17 3/4 in; 45.085 cm
ID Number
PH*326931
catalog number
326931
accession number
264083
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Data Source
National Museum of American History, Kenneth E. Behring Center

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