Wall Surveyors' Vernier Compass
Wall Surveyors' Vernier Compass
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- Description
- 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.
- Location
- Currently not on view
- Object Name
- Surveyor's Compass
- date made
- 1845-1854
- maker
- Wall, Thomas
- place made
- United States: Ohio, Cleveland
- Measurements
- overall length: 17 5/8 in; 44.7675 cm
- needle: 6 7/8 in; 17.4625 cm
- 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
- ID Number
- PH.335532
- accession number
- 321714
- catalog number
- 335532
- 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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