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Professor R. G. ROBERTSON (Member): The Author is to be congratulated on a new principle he has used and which can be stated as follows: In a frame containing several redundants the analysis may be made in two stages.
I AM very honoured and deeply grateful for this opportunity of meeting my English colleagues and of talking to them about some of the work I have done in the course of an already long career as designer and constructor.
Pier Luigi Nervi
Professor A. L. L. Baker (Member) opened the discussion by saying that he agreed entirely with what the authors had said in their presentation but not with what they
had written in the paper. He agreed with the statistical, probabilistic approach. It was obviously the only logical way of dealing with the variations of strengths of materials and the variations and vagaries of loading. There were one or two points in the paper which Professor Baker found slightly misleading. First of all, the matter of basing a design entirely upon a probability of failure-10-7-and a minimum cost, and saying that one could not entirely guarantee a structure against failure, needed some qualification. He thought this was rather a dangerous statement.