TEMPERING TRAP SPRINGS—I have a number of trap springs that have become weak from long use. Do you know of a method of tempering them?
Heat the spring to a hardening color, take care not to burn the metal put it in oil and let it cool until the metal does not simmer, then put it back in the fire and heat it just long enough to burn the oil off and cool it in water, lard oil, black oil or any other oil that is good for tempering. This method is good for any kind of spring. It is simple and can be depended upon and may be done anywhere with a stove fire and a little oil. While one might occasionally strike a fair temper by this method, I would not advise any person to experiment on more than one spring at a time, if the springs are of any use as they are. As I stated before, tempering is an art and, but little understood by the ordinary mechanic, it cannot be done with any degree of certainty at a stove or small fire. I have spent a year in the Oneida Community trap shop and know from what I saw there that the novice could not make a success of tempering trap springs.
Harding, A.R.. 3001 Questions and Answers. Columbus, Oh: A.R. Harding, 1913.
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