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
subject
Art
Transportation
Cultures & Communities
Scrimshaw
See more items in
Work and Industry: Maritime
Scrimshaw
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Dr. and Mrs. Wilbur J. Gould

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Image CAPTCHA
Enter the characters shown in the image.