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Mr. A. C. Paterson: As the demand for cooling water for power generation and for industrial and chemical processes grew towards the end of the last century, a point was reached when there were no longer sufficient supplies from rivers and lakes, and it had to be accepted that the same water would have to be used over and over again.
I read with interest the paper 'Natural frequencies of structures for designers'. Professor Bolton has shown that, with his approximate method, the natural frequencies of multistorey frames can be obtained within 3.3% accuracy. I have solved a three-bay, twostorey frame (which was also solved by Armstrong) using the method proposed by Professor Bolton. The calculations for this frame are given below:
The President and Mrs. Harris have now completed most of their visits to the Institution Branches in the UK and Ireland, and have asked that their thanks be offered to Branch Committees and members generally-and their ladies-for the many kindnesses that have been extended to them everywhere.