Abney Level

Abney Level

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Description
William de Wiveleslie Abney (1843–1920), an English scientist who made many important contributions to spectroscopy and photography, devised this level in the 1870s while working for the School of Military Engineering at Chatham. W. & L. E. Gurley described it as an English modification of the Locke hand level, noting that it gives angles of elevation "and is also divided for slopes, as 1 to 2, 2 to 1, etc."
Since the main tube of this example is square, it can be applied to any plane surface. The clinometer scale is graduated to degrees, and read by vernier to 5 minutes. The inscription on the case reads "DIETZGEN."
Ref: W. & L. E. Gurley, A Manual of the Principal Instruments Used in American Engineering and Surveying (Troy, N.Y., 1893), p. 228.
C. Jones, "Sir William de Wiveleslie Abney, K.C.B., D.C.L., D.Sc., F.R.S., Hon. F.R.P.S., etc.," The Photographic Journal 61 (1921): 296–311.
Location
Currently not on view
Object Name
Abney level
Measurements
case: 6 7/8 in x 3 3/4 in x 1 3/4 in; 17.4625 cm x 9.525 cm x 4.445 cm
level: 2 5/8 in x 6 in x 1 3/8 in; 6.6675 cm x 15.24 cm x 3.4925 cm
overall in case: 7 in x 3 3/4 in x 1 5/8 in; 17.78 cm x 9.525 cm x 4.1275 cm
ID Number
1989.0403.13
catalog number
1989.0403.13
accession number
1989.0403
Credit Line
LaVerne Watkins
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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