WE have made a practice of publishing at intervals articles surveying the progress made in elucidating, and summarising the state of knowledge arrived at in regard to, various problems that have from time to time become prominent in regard to the performance or safety of the aeroplane. One of the difficulties in selecting subjects for such surveys is to determine when the time has arrived at which knowledge has, as the result of investigation, become more or less stabilised, at any rate for the time being, and a stage has been reached when there is one of those pauses in the pursuit of information which makes the occasion suitable for taking stock. We have frequently had from readers confirmation of our own view that these surveys are of interest to them and only recently we have had a communication from overseas indicating that articles of this type are welcome and looked forward to by readers who are cut off by distance from the main centres of original investigation and research.
MCB UP Ltd
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