Pole, Perch, Rod.

16.5 feet. (Johnstone, 1975, p.22)

The perch, as a unit of measure, can be traced back to pre-Saxon Britain. Circa 1300 A.D. the foot was standardized in Britain. With the pre-existing measurement of the “perch” already defining much of the land, the length (in the new standard foot) was established to be 16.5 feet.

http://www.pobonline.com/articles/86512-web-exclusive-the-surveyors-rod

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