Surveyor's Vernier Compass

Surveyor's Vernier Compass

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Description
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.
Location
Currently not on view
Object Name
Surveyor's Compass
date made
1891-1906
maker
Mahn, Herman
place made
United States: Missouri, St. Louis
Measurements
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
PH.333650
catalog number
333650
accession number
300659
Credit Line
University of Missouri at Columbia.
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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