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Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Council, Reports and Technical Translations of the United States National Aeronautics and Space Administration and publications of other similar Research Bodies as issued.

A report is given on the above Congress which was attended by approximately 550 delegates from twenty‐seven countries. The sixty papers presented embraced the subjects of aerodynamics, materials, structures, propulsion, air transport, aerospace medicine, space Hight and re‐entry; a selection of these papers are summarized below.

This book should prove a valuable addition to libraries of both student and teacher. That the author brings to his task a wealth of teaching experience is evident from the fact that the book has grown round an extensive course of undergraduate lectures delivered over periods of three years in the Chemical Engineering Department of the University of Birmingham. It often happens that works, compiled in this manner (and this one is no exception), are marked by a special clarity of expression and logical development, since the writer is not only well acquainted with undergraduate difficulties but has also inevitably encountered those searching student cross‐examinations which, though painful at first, can only lead to a progressive clarification of his thinking and presentation.

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Council, Technical Reports and Translations of the United States National Aeronautics and Space Administration and publications of other similar Research Bodies as issued.

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Council, Technical Reports and Translations of the United States National Aeronautics and Space Administration and publications of other similar Research Bodies as issued.

For convenience I will limit myself to one class of enterprise, the large engineering company. By management I mean those senior employees who form and execute policy, control finance and decide the nature of the product and how it shall be sold, in short, those whose daily operations are distinguished by a degree of remoteness from the practical and mundane affairs of the great majority of the rest of the employees. By information I mean what is communicated between these senior employees.

IN modern aeronautics each generation of aircraft is aimed at higher goals of performance and capability. To achieve these technical advances more refined techniques have to be applied in every aspect of design. A great part of these new techniques will be derived from basic research. Such research, to be effective, has to be initiated a considerable time before its results will be needed for practical application. This necessitates having a clear appreciation of the probable trend in future aircraft development if the basic research is to be meaningful. It is most important also that such enterprises should be co‐ordinated in time scale and also in respect of their influence upon each other.

A quiet revolution is currently taking place in the field of propulsion, as engineers begin to appreciate the remarkable capability of the scramjet. The scramjet, or supersonic combustion ramjet, is a very simple device consisting only of an intake, combustion chamber and nozzle. It differs from the ramjet in that, at hypersonic speeds, the air velocity is only decreased by a few per cent in the inlet and the combustion heat release occurs at supersonic velocity. Although its efficiency is small at low supersonic speeds, FIG. 1 shows that it can achieve high efficiency over a very wide velocity spectrum. Furthermore, for much of this range, a fixed geometry (Ref. 2) can be used with little loss in efficiency (as indicated by the dashed line on FIG. 1), thus presenting unparalleled capability for a simple engine unit.

The aims of laboratory work in engineering thermodynamics have been stated previously1 and a general order of priority appropriate to undergraduate students was suggested. Consideration is given below to some ways in which these aims can be accomplished by the type of experiment used and by removing from the laboratory activities which can be done more efficiently and effectively using other teaching techniques.

An analysis of the rank‐frequency distribution of the EURATOM‐thesaurus was carried out. Zipf's law (a hyperbolic function) was not found to be suitable for this distribution, and an exponential law was used. The total entropy of the thesaurus calculated by means of this exponential function was found in good agreement with the actual entropy of the thesaurus. The exponential function may provide a criterion to ‘revise’ some zones of thesauri.