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.
Machinery.
Various machinery was used to chop, grind, riddle and pound the bark. These included Farcot’s bark-cutting machine (used extensively in France), Weldon’s bark-grinding mill, and a device known as a Wiltze's mill or Catskill's mill (prevalent in 19th-century America).
References.
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