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

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Surveyor's Vernier Compass

Catalogue number:

"Roach & Warner, N.Y."

length 13.875 inches; needle 5 inches

John Roach and Henry Warner were in business together in New York for a few years around 1840, trading as Roach & Warner, and advertising surveying compasses and other instruments "of their own manufacture, warranted accurate and at lower prices than can be had at any other establishment." This compass has a variation arc on the north arm that extends 20 degrees either way; the vernier is moved by a large screw on the south arm, and reads to 2 minutes. There is a level vial on each arm.

Further Information:

Surveyor's Compass