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

This is an important book, as it is the first volume of an entirely new edition of a work sponsored and approved by the Royal Aeronautical Society. In the preface we arc told that ‘the purpose of the Handbook of Aeronautics is to collect together in as accurate and authoritative a form as possible, information which will be of everyday use to the designer and constructor of aircraft, and the aeronautical engineer’. Mr George Dowty, the Society's President, says in his foreword that ‘in order for a handbook of this nature to be useful it must be accurate and comprehensive’. In the latter connexion it must be judged in conjunction with the other members of the series; and as far as the design side is concerned we shall eagerly await the promised companion on Component Design.

EXACT methods for thermodynamic calculations of high temperature combustion processes at equilibrium are very involved and time‐consuming because of the increasing influence of dissociation with increasing temperatures above 1800dcg. K. Many simplified methods have been proposed, but most of them are still rather complicated or approximate and are cither suitable for a special type of application only or based on assumptions valid within conditional limits. From the research engineer's point of view Mollier‐charts (total heat—entropy diagrams) would be most useful, but for general use too many charts would be required. For every possible reaction as many charts as there are mixture ratios have to be considered. Professor Lutz of Braunschweig proposed in 1947 a new type of enthalpy‐chart, which enables a wide range of applications to be covered by a reasonable number of charts. A number of such charts have been constructed by the Ministry of Supply.

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

This particular Mollier‐Chart has been constructed for investigations for increasing the power output of internal combustion engines and gas turbines by means of water injection into the supercharger or compressor respectively. Since the chart may be useful for other similar problems a short description is given and an example illustrates its application.

IN very high performance aircraft—that is aircraft flying at high speeds and high altitudes—the thermal problems confronting the mechanical engineer are becoming progressively more and more severe. Atmospheric Temperature ranges of upwards of 100 deg. C combined with thermodynamic effects due to the high speeds, widely varying air pressure and moisture content are encountered and very rigid temperature limits for the various component parts of the aircraft have to be met with equipment of a minimum size and weight and without materially affecting the overall performance of the machine.

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

In view of the continued expansion of civil air operations, it is perhaps surprising that few comprehensive textbooks dealing with airline maintenance practice have been published in recent years. This can probably be attributed to three factors, of which the first is the complexity of modern airliners and the wide range of engineering knowledge required for their satisfactory maintenance. This renders it difficult to compress an adequate amount of information into a volume of reasonable size which will sell at a price within the purchasing power of maintenance engineers, airline inspectors and students. Another fact which is bound to inhibit potential writers of such textbooks is the plethora of literature of a mandatory nature, such as Manufacturers' Service and Instruction Manuals and the publications of the airworthiness authorities, with which it would serve no useful purpose for a textbook to compete. Lastly the pace of aeronautical development inevitably limits the duration of usefulness of maintenance instructions so that they must be continuously revised if they are not to date as noticeably as a last year's creation by M. Dior.