Ivory Parallel Rules, 19th-20th Centuries

Description
Parallel rules were part of a mariner’s basic navigational tool kit, along with dividers and a compass. This device was used for finding a ship’s bearing (compass direction), plotting a course and then transferring it to different sections of a ship’s navigational chart for wayfinding purposes. This pair is made of thin slices of ivory resembling piano keys in size and thickness. The metal hinge pieces are machined and turned.
Location
Currently not on view
Object Name
scrimshaw
scrimshaw parallel ruler
Object Type
scrimshaws
date made
19th-20th century
Physical Description
ivory (overall material)
Measurements
overall: 4 1/2 in x 1 1/4 in x 1/8 in; 11.43 cm x 3.175 cm x .3175 cm
ID Number
1978.0052.09
accession number
1978.0052
catalog number
1978.52.9
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Work and Industry: Maritime
Cultures & Communities
Art
Transportation
Scrimshaw
Data Source
National Museum of American History, Kenneth E. Behring Center

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