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Members of the Institution will be grieved to learn that Dr. Walter Rosenhain, F.R.S.,
died on the 17th March, at the age of 58. Dr. Rosenhain was a brilliant metallurgist, and for twenty-five years held the post of Superintendent to the Department of Metallurgy and Metallurgical Chemistry at the National Physical Laboratory, Dr Rosenhain was President of the International Association for Testing Materials, and was a member of many scientific and technical societies, including the Institution of Structural Engineers, of which he was elected a Member in 1932. He published a large number of papers and addresses, and was to have presented a paper on “Metallic Materials of Construction” to the Institution in February. When the meeting was cancelled owing to his illness, he very kindly offered to prepare the paper for next session. His illness however proved to be fatal, and the Institution now mourns the loss of one of its most distinguished Members.
If in any statically indeterminate structure with r redundants, we introduce, Figure 1,
an additional hinge (a), or make a cut and supply a frictionless guide which allows either (b) purely axial displacements, or (c) purely transverse displacements, then the redundancy will be reduced by one degree.
Perhaps this subject is a little more important than is generally realised; at any rate, it is certainly more extensive then the average engineer or contractor anticipates. The various ramifications of this specialised type of construction are considered in the following notes, and it will be seen from the chart that whereas some
sections are expanded into great detail, others are dealt with in a very brief manner. For instance, whilst the portion headed "Omitting Concrete" is divided into "Floors" and "Walls" (an arbitrary division which is both natural and convenient), the paper deals only with the former. These drastic limitations are necessary in order to keep the paper of reasonable size.