Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Surveyor's Vernier Compass - click to enlarge

Surveyor's Vernier Compass - click to enlarge

Click photos to enlarge.

Surveyor's Vernier Compass

Catalogue number:
PH*337208

Inscriptions:
"James Foster, Jr. Cincinnati, O."

Dimensions:
length 15 inches; needle 5.5 inches

Discussion:

James Foster, Jr. (1814-1873) began advertising as a mathematical and philosophical instrument maker in Cincinnati, Ohio, in 1846, and showed instruments at several fairs sponsored by the Ohio Mechanics Institute in the 1850s. This compass belonged to Indiana State University. The rim is graduated every 30 minutes. The vernier on the north arm is moved by rack and pinion, and reads to single minutes. There is a circular level on the south arm.

Further Information:

Compass

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