Surveyor's Compass

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Design features suggest that this compass may date from the third quarter of the 18th century. The bar holding the vertical sights is straight and narrow. The needle rim is graduated to single degrees, and numbered in quadrants from North and South. The face reads clockwise. And, with an extra needle and scales at North and South, the compass can serve as a clinometer for measuring angles of elevation.
Currently not on view
overall length: 13 1/8 in; 33.3375 cm
needle: 5 in; 12.7 cm
overall: 3 1/8 in x 15 1/2 in x 7 1/2 in; 7.9375 cm x 39.37 cm x 19.05 cm
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Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History