Surveyor's Vernier Compass

Surveyor's Vernier Compass

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Usage conditions apply
This surveyor's compass marked "Mahn & Co. St. Louis, Mo." dates from the period 1891-1906 when Herman Mahn was trading as such. It has a variation arc on the south arm that extends 24 degrees either way. The vernier is moved by a tangent screw on the south arm, and reads to 2 minutes. An outkeeper is on the south arm, and two level vials are on the north arm.
Currently not on view
Object Name
Surveyor's Compass
date made
Mahn, Herman
place made
United States: Missouri, St. Louis
overall length: 15 1/2 in; 39.37 cm
needle: 5 1/8 in; 13.0175 cm
overall in case: 4 7/8 in x 16 1/2 in x 7 5/8 in; 12.3825 cm x 41.91 cm x 19.3675 cm
ID Number
catalog number
accession number
Credit Line
University of Missouri at Columbia.
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Measuring & Mapping
Data Source
National Museum of American History
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