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The assumption made by the authors that the bolt load produces a uniformly distributed pressure on the outer surface of the plate isuspect, to say the least, and it would have been useful to test this assumption by an analysis of the internal stresses in the bolt head. A study I have made shows that the yield strength of reinforcing steel (i.e. general grade) in Kenya has a coefficient of variation of 17 per cent. Given that this applies also to structural steel, which is fairly certain, could the authors indicate the effect that this would have on their findings? They appear to presume that steel is an exact product. P.A. Campbell
Why should an engineer today concern himself with the past? Why consider the dead or worry about structural forms that are now outmoded, superseded design methods, or once hallowed assumptions now discarded? Most engineers see themselves as forward-looking people, anxious to be on top of contemporary knowledge and much more interested in what is to come than in what has been left behind.