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Foot (US Survey)


The US survey foot is a unit of length used historically in the United States for land surveying and mapping. It is defined as exactly 1200/3937 meters, which is approximately 0.3048006096 meters. This makes it very slightly longer than the international foot, which is exactly 0.3048 meters.


The US survey foot was established to maintain consistency with earlier land surveys and legal descriptions in the U.S. It was used extensively in the Public Land Survey System and other cadastral surveys.


Key points:



  • 1 US survey foot = 1200/3937 meters β‰ˆ 0.3048006096 meters



  • Slightly longer than the international foot by about 0.0006 millimeters



  • Used primarily in land surveying and legal documents



  • As of recent years, the US has been phasing out the US survey foot in favor of the international foot for standardization.



Though nearly identical to the international foot, the US survey foot remains important for understanding older land records and measurements.


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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