Roach & Warner Surveyor's Vernier Compass

This compass is marked "Roach & Warner, N.Y." It 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. 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."
Currently not on view
Object Name
compass (surveyor's vernier)
date made
Roach & Warner
overall length: 13 7/8 in; 35.2425 cm
needle: 5 in; 12.7 cm
place made
United States: New York
ID Number
accession number
catalog number
Measuring & Mapping
Surveying and Geodesy
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center

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