Abstract :
Dr. F. H. Rolt, O.B.E., said that it was indeed a privilege to be asked to open the discussion for quite a number of reasons. One was the fact that he had had the honour of presenting the first Sir Alfred Herbert Paper, which was on a rather similar subject. The second was that the present Paper had been presented by a colleague of his, Dr. Barrell. They had worked together at the National Physical Laboratory for some 30 years, and being very familiar with the work which Dr. Barrell had been discussing, Dr. Rolt could say that he had made an excellent job of it