Edge mill

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Edge runners in an oil mill Oelmuehle.JPG
Edge runners in an oil mill

An edge mill is a mill used for crushing or grinding in which stones roll around on their edges on a level circular bed. They were developed in China in the third century and are still used today in remote villages around the world. When the millstones were replaced with iron or steel disks in the 19th century, the mills were known as Chilean mills. [1]

It is used for milling ore and as an oil mill. [2] Horse or oxen-driven versions were used in pre-industrial revolution America as bark mills to shred tree bark to derive tannins for the leather industry.[ citation needed ]

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Bark mill

Bark mills, also known as Catskill’s mills, are water, steam, horse, ox or wind-powered edge mills used to process the bark, roots, and branches of various tree species into a fine powder known as tanbark, used for tanning leather. This powdering allowed the tannin to be extracted more efficiently from its woody source material. A barker would strip the bark from trees so that it might be ground in such mills, and the dried bark was often stored in bark houses.

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References

  1. Alban J. Lynch, Chester A. Rowland (2005), The History of Grinding, SME, pp. 78–80, ISBN   9780873352383
  2. "Edge mill". TheFreeDictionary.com. Retrieved 2019-05-08.