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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.


ChatGPT said:

Aln


An aln is an old Scandinavian unit of length traditionally used in Norway, Sweden, and Denmark, mainly for measuring cloth and textiles. It is roughly equivalent to 59.4 centimeters (about 23.4 inches), though the exact length varied by region and time period.


The aln was based on the length of the forearm, similar to the cubit in other cultures, and was commonly used by tailors and merchants.


Though obsolete today, the aln reflects historical measurement practices tied to the human body and remains of interest in historical and cultural studies of Scandinavia.


Summary:



  • 1 aln ≈ 59.4 cm (23.4 inches)



  • Used primarily for measuring textiles



  • Traditional Scandinavian unit based on the forearm length



  • Now mostly of historical interest



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