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To Temper Spiral Springs

Heat to a cherry red in a charcoal fire, and harden in oil. To temper, blaze off the oil 3 times, the same as for flat springs. mill picks are: First, get good steel. Second, work it at a low heat; most blacksmiths injure steel by overheating. Third, heat for tempering without direct exposure to the fire.

The lead bath acts merely as protection against the heat, which is almost always too great to temper well.