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Microcomputers Microcomputers are a subject of immediate concern to our readers; we are therefore squeezing into this column, as a sort of ‘stop press’ item, ideas put forward by Mr S. R. Ashley. Having pointed out the difficulties of users checking packaged programs, possible limits on use, the seller’s need to maintain security, the terms of sale, and possible effects on professional indemnity insurance cover, he closes: I have come to the conclusion that programs should be supplied unsecured, enabling users and checkers to satisfy themselves properly that the methods and results are valid for any particular application, which to my mind would relieve the deviser of responsibility while restoring a spirit of goodwill and trust which would almost certainly lead to more rapid improvement and development of programs. prepared to take this step or not, I would also like to see an independent body set up for the express purpose of checking the performance of programs; a ‘kitemarking’ or accrediting system based on comprehensive testing and comparison of results by different methods and programs. Verulam
Magdalene Bridge is one of the country’s oldest surviving iron bridges, and these papers comprise a detailed investigation into its early history, and a new computer method structural analysis which confirms its capability of withstanding modern high way loading. S.K. Morgan and T.J. Heathorn
The authors have presented an interesting method for the rapid estimation of maximum bending moments in decks of suspension bridges. Their approximate analysis draws to a logical conclusion the more general method described by Bowen and Charlton (reference 3 of the paper). It is clear that the use of symmetry and antisymmetry offers a considerable computational advantage :two sets of three linear simultaneous equations are solved far more quickly than one set of six. F. Van der Woude, M.S. Gregory and H.I.A. Hegab