Discussion

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

This month's letters include additional references for the June issue's Regent Street disease article and discussions about seismic design and minimum qualifications for carrying out structural engineering services.