Surveyor's Vernier Compass


Surveyor's vernier compass marked "Roach & Warner, N.Y." The variation arc on the north arm 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."

Date Made: 1840s

Maker: Roach & Warner

Location: Currently not on view

Place Made: United States: New York

See more items in: Medicine and Science: Physical Sciences, Surveying and Geodesy, Measuring & Mapping


Exhibition Location:

Data Source: National Museum of American History

Id Number: 1986.1024.01Accession Number: 1986.1024Catalog Number: 1986.1024.01

Object Name: surveyor's compass

Measurements: overall length: 13 7/8 in; 35.2425 cmneedle: 5 in; 12.7 cmoverall: 8 1/8 in x 14 in x 5 7/8 in; 20.6375 cm x 35.56 cm x 14.9225 cm


Record Id: nmah_745734

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