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2. Link (unit) - Wikipedia

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

   In many measurement systems based on former English units, the link has remained fixed at 0.66 feet, therefore 0.22 yards or 7.92 inches; it is the absolute length of the yard that has varied. A rare remaining application of the link is in the service of some surveying in the United States, which relates to the definition of the survey foot.

3. Yard - Wikipedia

   en.wikipedia.org/wiki/Yard

   It is ordained that 3 grains of barley dry and round do make an inch, 12 inches make 1 foot, 3 feet make 1 yard, 5 yards and a half make a perch, and 40 perches in length and 4 in breadth make an acre. The Liber Horn compilation (1311) includes that statute with slightly different wording and adds: [22]

4. Help:Convert units - Wikipedia

   en.wikipedia.org/wiki/Help:Convert_units

   {{convert|123|cuyd|m3+board feet}} → 123 cubic yards (94 m 3; 40,000 board feet) The following converts a pressure to four output units. The precision is 1 (1 decimal place), and units are abbreviated and linked.

5. 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.

6. Foot (unit) - Wikipedia

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

   The Egyptian equivalent of the foot—a measure of four palms or 16 digits—was known as the djeser and has been reconstructed as about 30 cm (11.8 in). The Greek foot (πούς, pous) had a length of ⁠ 1 / 600 ⁠ of a stadion, [12] one stadion being about 181.2 m (594 ft); [13] therefore a foot was, at the time, about 302 mm (11.9 in). Its ...

7. Conversion of units - Wikipedia

   en.wikipedia.org/wiki/Conversion_of_units

   The factor–label method can convert only unit quantities for which the units are in a linear relationship intersecting at 0 (ratio scale in Stevens's typology). Most conversions fit this paradigm. An example for which it cannot be used is the conversion between the Celsius scale and the Kelvin scale (or the Fahrenheit scale). Between degrees ...

8. System of units of measurement - Wikipedia

   en.wikipedia.org/wiki/System_of_units_of_measurement

   In antiquity, systems of measurement were defined locally: the different units might be defined independently according to the length of a king's thumb or the size of his foot, the length of stride, the length of arm, or maybe the weight of water in a keg of specific size, perhaps itself defined in hands and knuckles. The unifying ...

9. Inch - Wikipedia

   en.wikipedia.org/wiki/Inch

   It is equal to ⁠ 1 / 36 ⁠ yard or ⁠ 1 / 12 ⁠ of a foot. Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to translate similar units in other measurement systems, usually understood as deriving from the width of the human thumb. Standards for the exact length of an inch have varied in the past, but since the ...