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Mr C. Tucker (M) (British Railways Board): I would like to contribute two points, one of which is a little out of order in that it is an extension on the scope of the paper, but nonetheless is most relevant and features somewhat novel engineering.
Micros and structural engineers This month we have two letters dealing with the use of microcomputers in structural engineering to fan the spark originally struck by Mr B. C. Bird in our April column. Mr Peter Carr has written from St Albans on the availability of computer programs. Verulam
With the development of articulated metal structures during the 19th century and the recognition of statical-indeterminacy, an era of intense interest in labour-saving extremum principles emerged. Outstanding among those principles is that of ‘least work’. It was discovered independently, principally by Menabrea, Castigliano, and Frankel. This paper is concerned with the conceptual contrasts of their work, as being highly instructive. Interesting personal relationships are necessarily included with Cremona’s judgment of Menabreand Castigliano following their notorious dispute within the Academy of the ‘Lincei’. T.M. Charlton