Surveyor’s Chain (1/2 Gunter)

In the colonial period and throughout the nineteenth century, most American surveyors measured distances with chains. The favored form was the Gunter, introduced by the English mathematician, Edmund Gunter, in 1620. This has 100 links and measures 66 feet (or 4 poles) overall. Thus 80 chains equal a mile, and 10 square chains equal an acre. The chain shown here is a half-Gunter, with 50 links measuring 33 feet overall. It is one of several instruments that James Griswold used to lay out the New York and Erie Canal.
Currently not on view
Object Name
chain, surveyor's (Griswold coll)
Physical Description
iron (overall material)
brass (overall material)
overall: 10.06 m; 33 ft
associated place
United States: Connecticut, Ridgefield
ID Number
accession number
catalog number
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Artifact Walls exhibit
Natural Resources
Data Source
National Museum of American History, Kenneth E. Behring Center

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