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2. Chain (unit) - Wikipedia

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

   One link is a hundredth part of a chain, which is 7.92 inches (20.1168 cm). [7] The surveyor's chain first appears in an illustration in a Dutch map of 1607, [8] and in an English book for surveyors of 1610. [9] In 1593 the English mile was redefined by a statute of Queen Elizabeth I as 5,280 feet, to tie in with agricultural practice.

3. Hardness comparison - Wikipedia

   en.wikipedia.org/wiki/Hardness_comparison

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

4. Rod (unit) - Wikipedia

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

   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 16 + 1 ⁄ 2 feet, equal to exactly 1 ⁄ 320 of a mile, or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain), and is exactly 5.0292 meters.

5. Gunter's chain - Wikipedia

   en.wikipedia.org/wiki/Gunter's_chain

   A quarter chain, or 25 links, measures 16 feet 6 inches (5.03 m) and thus measures a rod (or pole). Ten chains measure a furlong and 80 chains measure a statute mile. [1] Gunter's chain reconciled two seemingly incompatible systems: the traditional English land measurements, based on the number four, and decimals based on the number 10.

6. List of conversion factors - Wikipedia

   en.wikipedia.org/wiki/List_of_conversion_factors

   ≡ 1 atm × 1 cm 3 /min = 1.688 75 × 10 −3 W: atmosphere-cubic centimetre per second: atm ccs [citation needed] ≡ 1 atm × 1 cm 3 /s = 0.101 325 W: atmosphere-cubic foot per hour: atm cfh [citation needed] ≡ 1 atm × 1 cu ft/h = 0.797 001 247 04 W: atmosphere-cubic foot per minute: atm cfm [citation needed] ≡ 1 atm × 1 cu ft/min = 47 ...

7. Link (unit) - Wikipedia

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

   A Gunter's chain showing the individual links. The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. In US customary units modern definition, the link is exactly 66 ⁄ 100 of a US survey foot, [1] or exactly 7.92 inches or 20.1168 cm.

8. Big Bertha (howitzer) - Wikipedia

   en.wikipedia.org/wiki/Big_Bertha_(howitzer)

   Testing resulted in a 28 cm (11 in) howitzer transportable over road and countryside but it was rejected by the APK, as was Krupp's 30.5-centimetre model. Finally, in late 1911, Krupp and the APK developed a wheeled 42-centimetre howitzer, the 42-centimetre kurze Marinekanone 14 L/12 or Minenwerfer-Gerät ( M-Gerät ).

9. Kuhn length - Wikipedia

   en.wikipedia.org/wiki/Kuhn_length

   The length of a fully stretched chain is = for the Kuhn segment chain. [5] In the simplest treatment, such a chain follows the random walk model, where each step taken in a random direction is independent of the directions taken in the previous steps, forming a random coil .