. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. t otherwise there w^ill be a crook in it flatwise. How-ever, supposing there is a crook in it, polish one sidebright and draw the temper to a light blue by hold-ing the knife flatwise over the fire and moving backand forth in order to get a very even temper, ^but be-fore cooling off place the draw knife on the anvil andtake the crook out by striking it with the hammer. Thereason the crook is taken out so easy is because onlytwo-thirds of the knife was hardened, the back of theknife remaining unhardened, w
. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. t otherwise there w^ill be a crook in it flatwise. How-ever, supposing there is a crook in it, polish one sidebright and draw the temper to a light blue by hold-ing the knife flatwise over the fire and moving backand forth in order to get a very even temper, ^but be-fore cooling off place the draw knife on the anvil andtake the crook out by striking it with the hammer. Thereason the crook is taken out so easy is because onlytwo-thirds of the knife was hardened, the back of theknife remaining unhardened, which along with theheat being in the knife, allows the hardened and tem-pered part to bend without springing back, now cooloft* and the knife is ready to grind. After the tempering is done, to bend the handles toshape, heat to a dull red, being careful not to draw the TOOLSMITH AND STEELWORKER 121 temper in the main body of the knife. This will beovercome if the body of the knife is placed in wateror by keeping it cool with a wet rag or sponge. Piece of steel bent, to make draw
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