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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).

3. Surveying - Wikipedia

   en.wikipedia.org/wiki/Surveying

   The survey was a chain of quadrangles containing 33 triangles in all. ... sections to allow the sale of land. ... Penetrating Radar for Land Surveying; Survey Earth A ...

4. 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]

5. Link (unit) - Wikipedia

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

   The unit is based on Gunter's chain, a metal chain 66 feet long with 100 links, that was formerly used in land surveying. Even after the original tool was replaced by later instruments of higher precision, the unit was commonly used throughout the English-speaking world, for example in the United States customary units and the Imperial system .

6. Category:Surveying instruments - Wikipedia

   en.wikipedia.org/wiki/Category:Surveying_instruments

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7. Topographic Abney level - Wikipedia

   en.wikipedia.org/wiki/Topographic_Abney_Level

   The Abney level is an easy to use, relatively inexpensive, and, when used correctly, an accurate surveying tool. Abney levels typically include scales graduated in measure degrees of arc , percent grade , and in topographic Abney levels, grade in feet per surveyor's chain , and chainage correction.

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9. Ramsden surveying instruments - Wikipedia

   en.wikipedia.org/wiki/Ramsden_surveying_instruments

   Their accuracy was adequate for cadastral surveying but they were deemed insufficiently accurate for the Anglo-French Survey (1784–1790), Britain's first high-precision survey. Roy asked Ramsden to prepare a new chain of 100 links, each one foot in length. [12] He also asked Ramsden to prepare three precisely-calibrated wooden rods 20 feet long.