Читать книгу The Handyman's Book of Tools, Materials, and Processes Employed in Woodworking - Paul N. Hasluck - Страница 153

The cheapest oilstone in the market at first cost is the Nova Scotia or Canada stone, which is brownish yellow in colour, and wears away rather quickly. They vary considerably in quality; one may cut like a grindstone and leave about as good an edge, whilst another may be very hard, requiring a lot of rubbing to sharpen a tool. One between the two extremes should be chosen if possible. The Washita (Ouachita) stone is yellowish-grey in colour, and though it wears away quickly it does so much more regularly than Turkey stone. Some kinds are of a whitish-grey or light buff colour when oiled. The same remarks apply to these as to the Canada stones, but they are usually finer in grain and more even in texture, and for this reason are general favourites. These stones sharpen the tools quickly, but do not leave so good an edge as is obtained with the Charnley Forest stones, and they wear away more quickly. The edge produced by a Washita stone is generally of a “wire edge” description, and rapidly becomes dull. These and other soft stones soon get full of grooves and furrows if much used for sharpening narrow tools, small chisels, or other pointed instruments, for which a hard stone should be employed. Arkansas oilstone is a compact white stone something like Washita stone, but finer in grain. It wears well and cuts slowly, being largely used for finishing the fine edges of surgical instruments. Workers generally consider them to be the best oilstones in the market, but, unfortunately, they are very expensive.