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It is reasonable to say that our modern civilisation has been built on a foundation of Iron and Steel. The multitudinous uses to which they have been put have caused engineers and those whose duty it is to safeguard and preserve them, to realise how difficult it is to suppress the destructive processes of corrosion. The belief that corrosion was practically inevitable had led to a customary and arbitrary increase in metallic thickness beyond that functionally required, and to an instinctive avoidance of exposed metallic surfaces in buildings of a permanent nature.
David W. James-Carrington
Mr. Dorman: ‘Judging by the number of enquiries relating to the merits of various roofing systems received by the BCSA central office, Dr. Buchholdt is to be congratulated on producing a timely paper. It will be of considerable value to have this present study, with its summary of the state of the art in the design of tension
structures, and one would certainly hope that this paper will go some way towards bridging the “credibility gap” between research and development activity on the one
hand, and design practice on the other.'
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