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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 β‰ˆ 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.


Ell


An ell is a historical unit of length that was commonly used in medieval Europe, especially for measuring textiles and cloth. Its length varied by region but was typically about 45 inches (approximately 1.143 meters).


The ell originated from the length of the arm or forearm and was often used by tailors and merchants to measure fabric. Different countries had their own versionsβ€”for example, the English ell was about 45 inches, while the Scottish ell was longer, around 37 inches.


Although obsolete today, the ell played an important role in trade and clothing production before standardized measurements became widespread.


Summary:



  • 1 ell β‰ˆ 45 inches (1.143 meters)



  • Used mainly for measuring cloth and textiles



  • Length varied by region and country



The ell is now largely of historical interest but reflects the origins of many modern measurement systems.




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