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Last month this column passed on some interesting data and comment from Mr. F. D. Beresford ; he suggested that the assumed increase in strength of concrete over the years might be somewhat dubious and recommended the adoption of the 28 day value for design. Mr. Gordon Rose who initiated the discussion (February 77) returns to the subject, if not in the same vein, certainly with the same object. He writes: I would indeed prefer to respond to Mr. Murphy on the subject of longterm ageing rather than pursue the matter of cube/core; except to say that one could write a book mentioning all those who claim that 8 m is there to cover their particular deficiencies. (Come to think of it, I have written a book on it!).
Members of the Institution are employed on many varied tasks. In this paper first presented to the Study Group on the history of structural engineering, which meets under the Chairmanship of James Sutherland, I describe the work of a small group of engineers employed in a multi-disciplinary team within DAMHB which forms part of the Department of the Environment.
In The Structural Engineer for July 1977 you report the discussion on the paper 'Structures for the Olympic Complex in Montreal 1976'. The contribution by my old friend Professor Happold contains an error of historical fact which should not go uncorrected. The yield line theory was not invented by Professor Johanssen, it was discovered by Aage Ingerslev who published it in your journal in 1923.