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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:
Fortunately, we are still living in an era in which timber, that is to say sawn timber, is readily available as a structural material and, over the years, continued research, backed by traditional experience, has allowed it to be used with increasing confidence and efficiency in a wide range of structures. Techniques of stress grading, based on visual inspection and on non-destructive testing, are available to enable the timber used to be adequately controlled as regards strength. More recently, a new generation of timber-based products, involving some manufacturing or processing, is being presented for evaluation and use as a structural material. These products may or may not possess properties that reflect those of timber, and their evaluation does present problems.