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Whilst I have a high regard for Mr. Creasy and as usual thoroughly enjoyed his paper on the above subject, I would likc to correct him on his reference to the submission of structural designs for Local Authority approval.
Anyone delving into the past history of concrete cannot fail to be impressed by the astonishing amount of knowledge possessed by ancient engineers. It would seem that the only difference between them and their modern counterparts is that they did not have slide rules and computers. They certainly had a great deal of courage, ingenuity and engineering ability, and produced some astounding structures.
Long span bridges are defined as those in which the influence of deadweight and construction methods becomes of the greatest importance, and for the purpose of this paper will include bridges having spans of 150 ft. or more.