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THE estimation of the performance of the components of gas turbine plants requires specific heat data of four‐figure accuracy, particularly where small differences in the calculated quantities are necessary as in part‐load performance. This usually involves the use of accurate charts of kp against temperature, although four‐figure tables are also available.

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.

RECENT developments in the design of supersonic aeroplanes and particularly the ducting problems connected with the installation of turbo‐jet and rocket engines have brought about a considerable increase in the complexity of calculations required for prediction of performance. This is especially true when several alternative solutions are considered and the final choice depends on the relative performance. Any graphical methods which can reduce this calculations work are therefore of considerable practical value.

The author is Professor of Aeronautical Engineering and Applied Mechanics at the Brooklyn Polytechnic. He is well known to the British aero‐nautical world not only for his writings but as a fluent and stimulating speaker. In this volume Professor Hoff develops a system of analysis starting from the principle of virtual displacements. In the first of the four Parts this principle is explained and, after a brief glance at its application to mechanisms, is used to find the forces and displacements in jointed frameworks. The principle is applicable to both simply stiff and redundant frames. An engine mounting under torque loads from a radial engine is discussed in full detail to illustrate the application to a redundant space frame with the aid of tension coefficients. This Part ends with the treatment of beams by virtual displacements, the Hardy Cross moment distribution method and the analysis of the rigid unbraced frame.

These proceedings cover a study conference of the Federation Internationale de Documentation, held at Beatrice Webb House, Dorking, Surrey, from the 13th to the 17th May 1957, following a decision taken at the Brussels Conference of the F.I.D. in September 1955.

Under this heading 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.

The author in his preface states that the text should serve as a stepping stone between introductory dynamics and the more advanced fields of engineering analysis and that the development of the theory as a carefully planned sequence of concepts has made possible the inclusion of much material (for example, such topics as transient phenomena, self‐excited vibration, and control systems) not ordinarily dealt with in an introductory course.

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.

As a protective coating, zinc occupies the leading position amongst the metals. Here we are concerned mainly with the corrosion of zinc galvanizing in many of its applications. The position of zinc relative to the other commonly used metals for coatings for the protection of steel is briefly compared.

THE University of London Special and General degrees influence strongly the teaching of advanced physics in technical colleges. Most advanced teaching in the past has been for candidates for the external University examinations, and it is already apparent that some courses for the Diploma in Technology are being modelled, consciously or otherwise, on the degrees. The old regulations degree papers retained for many years their archaic form which, despite a few questions on more recent discoveries, essentially adopted the point of view of 1920. The change of regulations gave some hope of improvement, but a study of recent papers leaves one with the conviction that little advance has been made.