Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Fig. 2321. Grinding- Wheels. of England are highly esteemed. Different loctilitie.!of that country afford such as are reijuired for almostevery purpose. Among these the Newcastlestones, from the coal measures of Northumberlandand the adjacent counties, have a pre-eminence inEngland for general purposes ; others are used forgrinding, while many varieties are empl
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Fig. 2321. Grinding- Wheels. of England are highly esteemed. Different loctilitie.!of that country afford such as are reijuired for almostevery purpose. Among these the Newcastlestones, from the coal measures of Northumberlandand the adjacent counties, have a pre-eminence inEngland for general purposes ; others are used forgrinding, while many varieties are employed asplane surfaces for whetstones. Other qualities areused for hones. A German variety is famous forthis purpose. The very tinest qualities, an almost impalpable agglutinated jvowder, areiised as oil-stones. Such are the Water of Ayr, and Blue stones, and the Turkey old Royal Exchange of Lomlou was pavedwith this stone, and when it was bunied, about 1S34,the pavement yielded a handsome amount towardsthe re-erection. The Nova Scotia and Berea, Ohio, grindstones arelargely employed in this country ; these may be ob-tained of vei7 large size and uniform quality. TheWashita, Arkansa-s, stone is of the very finest
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