A grindstone is a cylindrical stone, on which sharpening, cutting, and abrasion are effected by the convex surface while the stone is revolving on its axis. They are made of sandstone, or sandstone grit of various degrees of fineness. Good stones are obtained in various parts of England, especially from the coal districts of Northumberland, Newcastle grindntones being especially famous. The Sheffield grindstone, traditionally used for grinding files and the like, is obtained from Hardsley, about 14 miles north of Sheffield. Artificial grindstones have also been successfully used. Research Grindstone
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Research Grindstone
