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Published online by Cambridge University Press: 28 July 2016
The process of cold pressing can only be applied to the more ductile metals, and the greater part of the material so treated is in the form of thin sheets. Leaving out of account such exceptional materials as lead, a ductile metal is appreciably hardened in the process, losing some of its ductility and having its “elastic limit” raised. It can be restored more or less completely by annealing, according to the temperature and the time of treatment. In addition, changes in ductility may occur in course of time, even at atmospheric temperatures.
A paper read at a joint meeting of the Institution of Automobile Engineers, the Royal Aeronautical Society, and other Technical Institutions and Societies.