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The Structural Engineer, Volume 59, Issue 3, 1981
President’s diary The President and Mrs Horne look forward to meeting members of the Bedfordshire and Adjoining Counties Branch at their Annual Dinner in Bedford on Friday 6 March. Professor Horne will be visiting Belfast on Tuesday 10 March and will be responding to the toast to the Institution at the Branch Annual Dinner that evening.
Mr W. J. Searle (HM Inspectorate of Mines and Quarries): I should like to congratulate Mr Taylor on his comprehensive review of colliery surface structures and the problems associated with them.
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.