Geodetic Base Bar


The U.S. Coast and Geodetic Survey designed and built this 4-meter base bar, No. 6, and transferred it to the Smithsonian in 1914. It is probably one of the secondary slide contact bars that was lent to the U.S. Geological Survey in the early 1880s. J. Howard Gore, of the Geological Survey, found that “Four meter bars were preferred to those six meters long, since they are more easily transported and are less liable to injury by careless handling.”

Ref: Report of Mr. J. Howard Gore, Dec. 11, 1881, in Third Annual Report of the United States Geological Survey (Washington, 1883), pp. 30-32.

Location: Currently not on view

See more items in: Medicine and Science: Physical Sciences


Exhibition Location:

Credit Line: Coast & Geodetic Survey, Department of Commerce

Data Source: National Museum of American History

Id Number: PH.285243Accession Number: 57456Catalog Number: 285243

Object Name: 4-meter Standard Bar, No. 64 meter bar

Measurements: overall: bar: 5 1/2 in x 4 in x 157 3/4 in; 13.97 cm x 10.16 cm x 400.685 cmoverall: case: 6 1/2 in x 11 in x 160 3/4 in; 16.51 cm x 27.94 cm x 408.305 cm


Record Id: nmah_1850881

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