Surveyors' Vernier Compass
date: label: date made
content: 1845-1854
name: label: maker
content: Wall, Thomas
notes: label: Description
content: This is an usually large compass, with an unusual skeletal design. The rim is graduated to 30 minutes. The variation arc on the north arm extends 20 degrees either way, and is read by folded vernier to single minutes. Two level vials are on the south arm. The "Thos Wall Cleveland O." signature refers to Thomas Wall (1797-1854), an instrument maker who worked in Cleveland, Ohio, in the years 1845-1854.
label: Location
content: Currently not on view
place: label: place made
content: United States: Ohio, Cleveland
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: PH.335532
label: accession number
content: 321714
label: catalog number
content: 335532
objectType: label: Object Name
content: Surveyor's Compass
physicalDescription: label: Measurements
content: overall length: 17 5/8 in; 44.7675 cm
label: Measurements
content: needle: 6 7/8 in; 17.4625 cm
label: Measurements
content: overall in case: 4 1/4 in x 18 9/16 in x 8 3/4 in; 10.795 cm x 47.14875 cm x 22.225 cm