The frame of this instrument is ebony, while the arcs, vanes, and inlay are boxwood.
Currently not on view
Object Name
date made
18th century
overall: 25 1/4 in; 64.135 cm
overall: 14 1/4 in x 5 in x 25 1/4 in; 36.195 cm x 12.7 cm x 64.135 cm
overall: backstaff: 25 1/4 in x 14 in x 3/4 in; 64.135 cm x 35.56 cm x 1.905 cm
overall: sights: 4 3/4 in x 1 1/4 in x 1 1/2 in; 12.065 cm x 3.175 cm x 3.81 cm
overall: woodblock: 5 in x 1 3/4 in x 5/8 in; 12.7 cm x 4.445 cm x 1.5875 cm
ID Number
accession number
catalog number
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Arthur R. Crittenden
Additional Media

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