A chain is a unit of length used in some older systems of measurement, particularly in surveying and land measurement. In the United States, one chain is equal to 66 feet or 22 yards. Internationally, it's defined as exactly 20.1168 meters.
Chains were historically used for measuring large plots of land and for surveying purposes, often in agriculture and real estate. However, the use of the chain as a standard unit of measurement has largely been replaced by the more modern and standardized metric and imperial systems, which use units like meters, feet, and yards.
The term "chain" comes from the practice of physically measuring land using a chain made of linked metal bars or wire. Each chain was typically 66 feet long, and surveyors would lay out chains end to end to measure distances across large areas. Today, modern surveying equipment such as electronic distance measuring devices (EDMs) and GPS technology have largely replaced the use of physical chains in land surveying.
An "ell" is an antiquated unit of length that has been historically used in various countries, including England, Scotland, and Germany. The length of an ell could vary depending on the region and the specific purpose, but it was typically used to measure cloth or textiles. The term "ell" is derived from the Latin word "ulna," which means "forearm," as the length of an ell was often based on the length of a person's forearm.
Different regions had their own variations of the ell, but some common measurements include:
English Ell: In England, the English ell was approximately 45 inches or 1.143 meters.
Scottish Ell: In Scotland, the Scottish ell was longer, measuring around 37 inches or 0.94 meters.
French Ell: In France, the French ell, also known as the aune, was used and had its own variations, but it was typically around 1.188 meters.
Flemish Ell: In parts of Europe, including Belgium and the Netherlands, the Flemish ell was used, which was approximately 27 inches or 0.686 meters.