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  2. Gunter's chain - Wikipedia

    en.wikipedia.org/wiki/Gunter's_chain

    Gunter's chain (also known as Gunter's measurement) is a distance-measuring device used for surveying. It was designed and introduced in 1620 by English clergyman and mathematician Edmund Gunter (1581–1626). It enabled plots of land to be accurately surveyed and plotted, for legal and commercial purposes. Gunter developed an actual measuring ...

  3. Chain (unit) - Wikipedia

    en.wikipedia.org/wiki/Chain_(unit)

    The chain (abbreviated ch) is a unit of length equal to 66 feet (22 yards ), used in both the US customary and Imperial unit systems. It is subdivided into 100 links. [1] [2] There are 10 chains in a furlong, and 80 chains in one statute mile. [2] In metric terms, it is 20.1168 m long. [2] By extension, chainage (running distance) is the ...

  4. Measurement of land in Punjab - Wikipedia

    en.wikipedia.org/wiki/Measurement_of_land_in_Punjab

    A commonly used land measurement unit in Punjab is karam or square karam. [ 3] Other units include the Sarsai and units listed. [ 4] This the current system of measurement of farm land. All Units. 1 karam × 1 karam = 1 sq. karam. 5.5 feet × 5.5 feet = 30.25 sq. feet. 30.25 square feet = 1 Sarsai.

  5. Rod (unit) - Wikipedia

    en.wikipedia.org/wiki/Rod_(unit)

    5.0292 m. The rod, perch, or pole (sometimes also lug) is a surveyor's tool [ 1] and unit of length of various historical definitions. In British imperial and US customary units it is defined as 161⁄2 feet, equal to exactly 1⁄320 of a mile, or 51⁄2 yards (a quarter of a surveyor's chain ), and is exactly 5.0292 meters.

  6. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    The nanometre ( SI symbol: nm) is a unit of length in the metric system equal to 10−9 metres ( ⁠ 1 1 000 000 000⁠ m = 0.000 000 001 m ). To help compare different orders of magnitude, this section lists lengths between 10 −9 and 108 m (1 nm and 10 nm). 1 nm – diameter of a carbon nanotube.

  7. Two-point conversion - Wikipedia

    en.wikipedia.org/wiki/Two-point_conversion

    Two-point conversion. In gridiron football, a two-point conversion or two-point convert is a play a team attempts instead of kicking a one-point conversion immediately after it scores a touchdown. In a two-point conversion attempt, the team that just scored must run a play from scrimmage close to the opponent's goal line and advance the ball ...

  8. Ancient Greek units of measurement - Wikipedia

    en.wikipedia.org/wiki/Ancient_Greek_units_of...

    A common unit in both measures throughout historic Greece was the cotyle or cotyla whose absolute value varied from one place to another between 210 ml and 330 ml. [1] The basic unit for both solid and liquid measures was the κύαθος (kyathos, plural: kyathoi). [4] The Attic liquid measures were:

  9. Barleycorn (unit) - Wikipedia

    en.wikipedia.org/wiki/Barleycorn_(unit)

    Under the 1300 Composition of Yards and Perches, one of the statutes of uncertain date that was notionally in force until the 1824 Weights and Measures Act, "3 barly cornes dry and rounde" [2] [3] were to serve as the basis for the inch and thence the larger units of feet, yards, perches and thus of the acre, an important unit of area.