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THE various flight procedures for medium and long range operation of transport aircraft are described, and the constant power basis is shown to be advantageous for airscrew‐driving power units when comparisons are required in the design study stage. To avoid the approximation involved in assuming a cruising speed which is a mean of the initial and final speeds and likely to introduce errors when the fuel load is an appreciable percentage of all‐up weight, a method is presented which by means of a chart enables the true Still Air Range to be evaluated.

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Committee, Reports and Technical Notes of the U.S. National Advisory Committee for Aeronautics and publications of other similar research bodies as issued

.Counter Competition. SUPERMARKETS and private shopkeepers battle for business in every High Street. In all shopping centres the private trader competes for the customer's cash with chain and departmental stores. He finds life increasingly difficult in face of rising overheads and shrinking profit margins.

First, the statistics. This issue of Jane's—corrected to September 1, 1962—contains a total of 504 pages apart from the two page preface by the Editor and 24 pages of indexes at the end of the book. Divided into six separate sections, it contains descriptions of the aeroplanes of thirty‐five countries, the sailplanes of twenty‐four countries, the target drones of six countries, the air cushion vehicles of seven countries, the guided missiles, rockets and space vehicles of seventeen countries and the aero engines of fourteen countries. By adopting a new method of information presentation it has been possible to increase the amount of new data in the book without increasing the actual number of pages. The fact that this edition of Jane's is no mere rehash of the 1961–62 number is underlined further by the inclusion of almost 600 new illustrations.

Geigy Co. Ltd. Stand 75. Diversified application of benzotriazole as a corrosion inhibitor specifically for copper and its alloys is the main theme of Geigy's stand.

Future legislation relating to the control of the national milk supply formed the subject of discussion in the House of Commons on the 5th March. Although no new points were brought out, the need for fresh legislation was emphasised in this discussion, especially the need for a general Act that would, while giving the central authority increased powers, do away “with the piecemeal, voluntary, and local enactments at present in existence. It is evident that if any radical change in the present system is to be effective it must not only be general as regards this country, but it must also be imperial” and international; inasmuch as it must deal both with the supplies that are produced at home and with those imported from abroad. It would obviously be in the highest degree unfair to the English farmer to make his stock, workpeople, and premises liable to the frequent expert inspection demanded, and, at the same time, to allow milk to enter this country from abroad without the application of an equally rigorous inspection on this side, and without some form of guarantee from the government of the country of origin. In all matters connected with food supply improved methods of preserving and sterilising as well as increased facilities for international commerce have resulted, as time has gone on, in a large number of food preparations of all kinds being thrown upon the markets. The trade in cheese and butter substitutes as well as that in canned and otherwise preserved meats, and the supply of cereal preparations, afford well known instances, and the milk trade is not singular in the circumstance that a considerable and increasing amount of, milk is treated in various ways, both at home and abroad, for consumption in this country.

Civil wrongdoings with consequent financial and other loss or damage to employers, employees and third parties may result in the course of various trade union activities. These day to day trade union activities take a variety of forms. The most common ones are inducement of breach of contract, conspiracy, trespass, nuisance, and intimidation. Each of these activities constitutes a tort which, unless the statutory immunities apply, would normally give rise at common law to an action for damages or, as is more frequent, enable the aggrieved party to obtain an injunction.

Aarhus Kommunes Biblioteker (Teknisk Bibliotek), Ingerslevs Plads 7, Aarhus, Denmark. Representative: V. NEDERGAARD PEDERSEN (Librarian).

The latest information from the magazine chemist is extremely valuable. He has dealt with milk‐adulteration and how it is done. His advice, if followed, might, however, speedily bring the manipulating dealer before a magistrate, since the learned writer's recipe is to take a milk having a specific gravity of 1030, and skim it until the gravity is raised to 1036; then add 20 per cent. of water, so that the gravity may be reduced to 1030, and the thing is done. The advice to serve as “fresh from the cow,” preferably in a well‐battered milk‐measure, might perhaps have been added to this analytical gem.

IN our last issue we made appeals for publicity by means of wireless broadcasting, and we are now pleased to state that this method has been successfully adopted and carried out by Mr. L. Stanley Jast at Manchester and by Mr. G. T. Shaw at Liverpool. We venture to suggest, however, that the executive of the Library Association should approach the British Broadcasting Company with a view to obtaining permission for a simultaneous broadcast weekly on some important phase of the Library Movement. The Liverpool and Manchester broadcasts were a purely local venture and would not reach listeners‐in outside a fifty‐mile radius unless very high power instruments were used. If, however, land lines could be put into operation it would be possible to reach every portion of the British Isles, and the possessor of the smallest crystal set would be able to hear. Could we not persuade the Hon. Secretary of the Library Association to undertake the task of addressing an invisible audience of something over a quarter‐of‐a‐million?