Keuffel & Esser Abney level with compass and pentaprism

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Keuffel & Esser described this as a "Universal Instrument," noting that it gives bearing, grade, and distance with sufficient accuracy for military reconnaissance and preliminary surveying. The clinometer scale is graduated to degrees, and read by vernier to 10 minutes. This example is marked "KEUFFEL & ESSER CO N. Y." New, it cost $34. The University of Missouri at Columbia gave it to the Smithsonian in 1972.
Ref: Keuffel & Esser, Catalogue (New York, 1921), p. 434.
Currently not on view
Keuffel & Esser Co.
place made
United States: New York, New York
case: 5 3/8 in x 3 3/8 in x 2 1/2 in; 13.6525 cm x 8.5725 cm x 6.35 cm
level: 2 5/8 in x 5 in x 1 3/4 in; 6.6675 cm x 12.7 cm x 4.445 cm
overall in case: 5 5/8 in x 3 1/2 in x 2 9/16 in; 14.2875 cm x 8.89 cm x 6.50875 cm
ID Number
catalog number
accession number
Credit Line
University of Missouri-Columbia, Department of Civil Engineering
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Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History


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