Читать книгу The Handyman's Book of Tools, Materials, and Processes Employed in Woodworking - Paul N. Hasluck - Страница 152

The oilstones in most general use are four in number—the Charnley Forest, Turkey, Washita, and Arkansas. The Charnley Forest oilstone is an old-fashioned English variety, and a good one will last a lifetime. This stone is of a greenishslate colour, sometimes with small red or brown spots. The lighter the colour of the stone, the more serviceable it will be. The softest and most even-grained stone should be selected, hardness being the most general defect. Stones of this variety may be good for some time, but if neglected, or if linseed oil is used, the stone will absorb the oil and become very hard, rendering a lot of rubbing necessary to sharpen a tool. A Charnley Forest oilstone may take a little more rubbing than other stones to get an edge, but it will be keen and fine, and as the stone wears slowly it seldom requires rubbing down. When two oilstones are used, a Charnley Forest stone is about the best for finishing the edge after it has been rubbed on a coarse cutting stone. The experience of many years suggests that the best stone a woodworker can select is a Charnley Forest stone, the edge produced by it enabling the woodworker to do the best work and more of it before the tool requires resharpening. Turkey stone is generally known as white, grey, and black, but its appearance is generally more or less of a mixture of brown and blue shades. It is of very close grain. Some Turkey oilstones are of a dark slate colour when oiled, with white veining and sometimes white spots. They give a keen, fine edge to tools, but wear very unevenly. In addition to this defect, they are the most brittle oilstones, great care being necessary to prevent a breakage when fitting them into a case, and a fall from the bench will generally result in cracking the stone, even after being boxed. The Turkey oilstone is a notoriously slow cutting stone; to most woodworkers its price is prohibitive.