Keuffel & Esser Abney Level

Keuffel & Esser described this as a Topographic Abney Level, "as made by us for the U.S. Forest Service." New, it cost $28. The level is marked "KEUFFEL & ESSER CO. N.Y." and "29349." The vertical arc is labeled "PERCENT" and graduated from 0 to 150 in both directions. Although the reference must be to percent of grade, the graduations are not regular, and their meaning is not yet understood.
Ref: Keuffel & Esser, Catalogue (New York, 1921), p. 365.
Currently not on view
Keuffel & Esser Co.
case: 6 3/4 in x 3 1/4 in x 1 1/2 in; 17.145 cm x 8.255 cm x 3.81 cm
level: 6 1/2 in; 16.51 cm
arc: 3 1/2 in; 8.89 cm
overall in case: 6 13/16 in x 3 1/4 in x 1 5/8 in; 17.30375 cm x 8.255 cm x 4.1275 cm
ID Number
accession number
catalog number
Credit Line
LaVerne Watkins
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Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center


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