JOURNAL OF THE INSTITUTE OF METALS

THE new volume of the Journal of the Institute of Metals contains a large number of papers, of which many deal with one aspect or another of the problems of hardness and of cold-working. The various methods of testing hardness are considered by several authors, and others deal with the changes in the properties of metals by deformation and the subsequent re-crystallisation when such deformed metals are annealed. This is one of the most interesting topics in metallurgy at the present time, and the work of Prof. Carpenter and others on aluminium, and of Mr. Cook on cadmium, recorded in this and recent volumes, shows how various may be the phenomena when different metals are compared. The investigations on the equilibrium in ternary alloy systems are proceeding, and there are no less than four papers from the National Physical Laboratory on the important and difficult alloys of aluminium, the knowledge of which is being extended very rapidly. A paper from America, by Messrs. Pilling and Bedworth, deals in a novel manner with the oxidation of metals at high temperatures, an aspect of corrosion which has received comparatively little attention, although its study is a necessary preliminary to any theory of the nature of corrosion. Another paper from-the United States is that by Dr. Gray on amalgams, in which the striking changes of volume and hardness in dental amalgams are considered. M. Portevin's paper on eutectics is beautifully illustrated, and the contributors in general have reached a remarkably high standard in the quality of the photo-micrographs used to illustrate their communications. The Journal of the Institute of Metals. G. Shaw Scott Edited by. Vol. 29. Pp. x+914+57 plates. (London: The Institute of Metals, 1923.) 31s. 6d. net.

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