C. L. Berger & Sons Dumpy Level

Description
E. G. Fischer and his colleagues in the Instrument Division of the U. S. Coast and Geodetic Survey designed this precise level in 1900. C. L. Berger & Sons began making levels of this sort around 1912, noting that they "follow absolutely" the Survey's specifications, "using 'invar' where specified, thus insuring a rigid maintenance of the adjustment of instrument under marked changes of temperature." This example is marked "C. L. Berger & Sons. Boston USA 17475.” It dates from 1930, and belonged to the Coast and Geodetic Survey.
Ref: E. G. Fischer, "Description of Precise Levels Nos. 7 and 8," Report of the Director of the United States Coast and Geodetic Survey (1900), Appendix 6.
C. L. Berger & Sons, Inc., Catalog of Engineering, Surveying & Mining Instruments (Boston, 1927), pp. 43-44.
Location
Currently not on view
maker
C.L. Berger and Sons
place made
United States: Massachusetts, Boston
Measurements
telescope: 17 in; 43.18 cm
ID Number
1986.0395.10
accession number
1986.0395
catalog number
1986.0395.10
Credit Line
U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Geodetic Survey Division
See more items in
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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