Surveyor's Vernier Compass
date: label: date made
content: 1840s
name: label: maker
content: Roach & Warner
notes: label: Description
content: 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."
label: Location
content: Currently not on view
place: label: place made
content: United States: New York
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Surveying and Geodesy
label: See more items in
content: Measuring & Mapping
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1986.1024.01
label: accession number
content: 1986.1024
label: catalog number
content: 1986.1024.01
objectType: label: Object Name
content: surveyor's compass
physicalDescription: label: Measurements
content: overall length: 13 7/8 in; 35.2425 cm
label: Measurements
content: needle: 5 in; 12.7 cm
label: Measurements
content: overall: 8 1/8 in x 14 in x 5 7/8 in; 20.6375 cm x 35.56 cm x 14.9225 cm