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Chain (US Survey)


The US survey chain is a unit of length used historically in land surveying in the United States. It is defined as exactly 66 US survey feet, which is slightly longer than the international foot. Since one US survey foot equals about 0.3048006096 meters, the US survey chain is approximately 20.11684 meters long.


Like the standard chain, it is divided into 100 links, each measuring 0.66 US survey feet. The US survey chain was widely used in the Public Land Survey System to measure land parcels and boundaries.


Key facts:



  • 1 US survey chain = 66 US survey feet



  • 1 US survey chain ≈ 20.11684 meters



  • 10 US survey chains = 1 furlong



  • 80 US survey chains = 1 US survey mile



Though the US survey foot and chain are being phased out in favor of international units, the US survey chain still appears in historical land records and some legal contexts.


Barleycorn


A barleycorn is an old English unit of length, traditionally based on the length of a grain of barley. It is defined as exactly 1/3 of an inch or approximately 8.47 millimeters.


Historically, the barleycorn was used for measuring small lengths and was also the basis for the inch, which was originally considered to be three barleycorns long. It played a role in various traditional measurements, including shoe sizing in English-speaking countries, where shoe sizes were sometimes expressed in barleycorn units.


Although obsolete as a formal unit, the barleycorn remains culturally significant, especially in shoe sizing systems.


Summary:



  • 1 barleycorn = 1/3 inch ≈ 8.47 mm



  • Based on the length of a grain of barley



  • Used historically in small measurements and shoe sizing



  • Mostly of historical and cultural interest today





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