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These 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, [6] operated by a crank handle, is found in the Carolingian manuscript known as the Utrecht Psalter. This pen drawing from about 830 goes back to a late antique original. [7]
The term is based on the word "whet", which means to sharpen a blade, [2] [3] not on the word "wet". The verb nowadays to describe the process of using a sharpening stone for a knife is simply to sharpen, but the older term to whet is still sometimes used, though so rare in this sense that it is no longer mentioned in, for example, the Oxford Living Dictionaries.
Colored Stones of Nüwa, five colored stones crafted by the goddess Nüwa that each represent one of the five Chinese elements, fire, water, earth, metal, and wood. ( Chinese Mythology ) Madstone , a special medicinal substance that, when pressed into an animal bite, was believed to prevent rabies by drawing the "poison" out.
In archaeology, ground stone is a category of stone tool formed by the grinding of a coarse-grained tool stone, either purposely or incidentally. Ground stone tools are usually made of basalt , rhyolite , granite , or other cryptocrystalline and igneous stones whose coarse structure makes them ideal for grinding other materials, including ...
The grooves began to attract scholarly attention in the 1850s. At first they were called "sharpening stones", but later they received the name "sword sharpening stones". After some time, newspapers and scholarly publications began to dispute this, since the shape of the grooves makes them unfit for sharpening swords.
Early observers saw the processing of mast using stones, and one later recreation achieved similar results: nuts were placed, one at a time, on stone (an "anvil" stone) and then struck with a smaller "hammer" stone: "As nuts were cracked in this manner a pit developed in the lower stone; the pit deepened as additional nuts were cracked, and ...
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