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2. Gunter's chain - Wikipedia

   en.wikipedia.org/wiki/Gunter's_chain

   Vincent Wing made chains with 9.90-inch links, most commonly as 33-foot half-chains of 40 links. These chains were sometimes used in the American colonies, particularly Pennsylvania. [13] In India, surveying chains 20 metres (65 ft 7.4 in) (occasionally 30 metres) in length are used. [14] Links are 200 millimetres (7.87 in) long. [15]

3. 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 .

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. 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.

6. Surveying - Wikipedia

   en.wikipedia.org/wiki/Surveying

   In this type of surveying all triangles formed by joining survey lines are considered as plane triangles. It is employed for small survey works where errors due to the Earth's shape are too small to matter. [18] In geodetic surveying the curvature of the Earth is taken into account while calculating reduced levels, angles, bearings and ...

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9. Category:Surveying instruments - Wikipedia

   en.wikipedia.org/wiki/Category:Surveying_instruments

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