Surveyors' Vernier Compass

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.

Date Made: 1845-1854

Maker: Wall, Thomas

Location: Currently not on view

Place Made: United States: Ohio, Cleveland

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

Exhibition:

Exhibition Location:

Data Source: National Museum of American History

Id Number: PH.335532Accession Number: 321714Catalog Number: 335532

Object Name: Surveyor's Compass

Measurements: overall length: 17 5/8 in; 44.7675 cmneedle: 6 7/8 in; 17.4625 cmoverall 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

Guid: http://n2t.net/ark:/65665/ng49ca746b3-6cb6-704b-e053-15f76fa0b4fa

Record Id: nmah_997219

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