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THE PRESIDENT (Professor J. Husband, F.R.C.Sc.I., M.Inst.C.E.) commented on the great interest of the subject of the paper, and said that probably the majority of the members had had to deal with underpinning in some form or another. He had had a good many underpinning jobs to look after, and Mr. Muirhead had put forward in the paper some exceptionally interesting examples of that class of engineering.
I propose in this address to invite your consideration of some of the principles upon which our present day structural design is based and to remember some of the scientists of bygone days to whom we are indebted for the discovery of these principles. A.A. Fordham
Professor F. W. Williams (M) and Dr. J. R. Banerjee (Department of Civil Engineering and Building Technology, UWIST, Cardiff): It is vital that designers should be aware that the author’s method gives only some of the natural frequencies of structures, and that the second and other low natural frequencies are likely to be among those missed. This is illustrated by considering the rectangular grid of Fig 13, which consists of 1250 identical, rigidly jointed, inextensible members and is prevented from swaying.