Roach & Warner Surveyor's Vernier Compass

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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
date made
Roach & Warner
place made
United States: New York
overall length: 13 7/8 in; 35.2425 cm
needle: 5 in; 12.7 cm
overall: 8 1/8 in x 14 in x 5 7/8 in; 20.6375 cm x 35.56 cm x 14.9225 cm
ID Number
accession number
catalog number
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History


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