Grindstone

Man using a portable grindstone; painting by Goya
Large waterwheel powered grindstone. The user would lie on the plank above the grindstone while grinding metal items, giving rise to the phrase nose to the grindstone.[1]

A grindstone is a round sharpening stone used for grinding or sharpening ferrous tools. Grindstones are usually made from sandstone.[2][3]

Grindstone machines usually have pedals for speeding up and slowing down the stone to control the sharpening process.

The earliest known representation of a rotary grindstone,[4] operated by a crank handle, is found in the Carolingian manuscript Utrecht Psalter. This pen drawing from about 830 goes back to a late antique original.[5] The Luttrell Psalter, dating to around 1340, describes a grindstone rotated by two cranks, one at each end of its axle.[6] Around 1480, the early medieval rotary grindstone was improved with a treadle and crank mechanism.[7]

See also

References

  1. ↑
  2. ↑ Grindstones, archived from the original on 2010-02-10, retrieved 2010-02-10.
  3. ↑ Knight, Edward Henry (1876), Knight's American mechanical dictionary, Houghton, Mifflin, pp. 1022–1023.
  4. ↑ White, Jr. 1962, p. 110
  5. ↑ Hägermann & Schneider 1997, pp. 425f.
  6. ↑ White, Jr. 1962, p. 111
  7. ↑ White, Jr. 1962, p. 167

Sources

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