this manner. Their quality is improved if forged a little before shaping up. Temper in oil at light straw, and hone edges carefully.
SPECIAL RASPS AND RIFFLERS, for wood and metal often save time and labor. These should be made from high grade tool steel, the teeth carefully filed in after a little forging to make the grain more compact, and then hardened in oil "at bright red heat. Draw the temper in a clear gas flame, but draw it just as little as possible—just enough to take the stress out of the metal and avoid breaking the teeth off. Chill in water the instant a very pale straw color appears. Figure 20 shows a couple of quickly made riffiers
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