Author: Brett, C W
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Brett, C W
The Department of Scientific and Industrial Research has just issued, through H.M. Stationery Office, a volume of its special reports on the mineral resources of Great Britain. It deals with the geological relations, nature and uses, and mineral, chemical and physical properties of ball clays, that is to say, of those plastic "transported" clays which, when fired in an oxidising atmosphere to the temperature of certain pottery ovens approximately 1,150 deg.-1,200 deg. C.-have a white or nearly white colour. They are formed by the decomposition of felspathic rocks, by natural agencies. In this decomposition, silicates such as the felspars break down, and the products ultimately undergo hydration with the formation of the hydrated silicate of aluminium, kaolinite, and, in many cases, mixtures of hydrated oxides. Where these products are found resting in the parent rock, the clays are termed residual; where they have been transported and deposited elsewhere, they are known as transported clays. The china clays of Cornwall are typical examples of the former; the ball clays discussed in this memoir are characteristic examples of the latter. Dr. Alex Scott
Sir Courtauld Thomson, chairman of the Limmer and Trinidad Lake Asphalt Company, in his speech at the annual general meeting in March, referred to the attention the company’s staff was paying to the problem of vibration, and the writers, who have worked in collaboration with the company’s staff, are now able to reproduce some results of experiments recently carried out. W.P. Digby and R.B. Fairthorne
We have received from Mr. Hal Williams a letter pointing out that the photograph of the new Heinz Building at Harlesden, shown on the front cover of The Structural Engineer for August, hardly does justice to the architectural and constructional features of that interesting addition to London's "far West" industrial buildings. Mr. Hal Williams says that the photograph shown below conveys a much better impression of the finished building, in the construction of which time was an all-important element. That the work was completed within the time specified was due very largely to the excellent work of the structural steel contractors, Messrs. Peirson & Co., Ltd., to whom he pays a well-deserved tribute.