Knocking stones, Knockin'-stanes or Clach chnotainn in Scottish Gaelic were exposed bedrock stone or boulders with a pot-shaped concavity cut into them used for husking barley and other cereals before the introduction of other methods of milling grain or when only small quantities of cereal were processed. == History == Knocking or husking stones were generally replaced by quern stones which in turn were eventually replaced by water and wind powered mills.
Knocking stones, Knockin'-stanes or Clach chnotainn in Scottish Gaelic were exposed bedrock stone or boulders with a pot-shaped concavity cut into them used for husking barley and other cereals before the introduction of other methods of milling grain or when only small quantities of cereal were processed. == History == Knocking or husking stones were generally replaced by quern stones which in turn were eventually replaced by water and wind powered mills.
Source: Wikipedia "Knocking stone" · CC BY-SA 4.0
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