C. L. Berger & Sons Dumpy Level

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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.
Currently not on view
C.L. Berger and Sons
place made
United States: Massachusetts, Boston
telescope: 17 in; 43.18 cm
overall: 10 1/2 in x 23 3/4 in x 12 3/8 in; 26.67 cm x 60.325 cm x 31.4325 cm
ID Number
accession number
catalog number
Credit Line
U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Geodetic Survey Division
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Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History