CORRESPONDENCE. THE MECHANICAL PROPERTIES OF STEEL.
52 The Author. DISCUSSION ON THE MECHANICAL [Minutes of soft irons and mild steels did mend themselves and recover their elasticity by mere lapse of time'. A comparatively slight change of temperaturein a metal, due, for instance, t o boiling inwater, accelerated the process of mending2. In the Paper by the Author referred to, examples were given of two test-pieces; one of them recovered its elasticity a t ordinary temperatures ina night, and the other, when tested after n year's interval, was found to give exactly the same hysteresis " loop as when tested 12 months previously...
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