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Inevitably, traditional shot blasting methods with their inherent drawbacks of lack of fine control, the problems of escaping dust and abrasive and the consequent resistance to them by operatives and managers alike, have had to change to keep pace with the times. And change in a dramatic fashion they most certainly have in the last few years with automation much in evidence. But what is not perhaps generally realised is just how great the advances have been and how widely automated impact treatment systems are used today in various sectors of industry.

Summary Stress measurements using the blind hole drilling technique with electrical resistance strain gauges have been made on surfaces of an aluminium alloy which have been subjected to a variety of grit blasting treatments. Relationships between the induced stress and depth were determined for each treatment. It is shown that the magnitude and the depth of the induced compressive stress are particularly sensitive to variations in grit size and, to a much lesser extent, to changes in the nozzle air pressure, the angle of impact and the duration of the treatment. Discussion of the results is centred on the need for control of the operating variables in particular applications. (c) Copyright H.M.S.O. London 1979

DESPITE reductions in the number of companies exhibiting and in the number of visitors, there were significant developments at the Paris Show. Several new aircraft made their first appearance, new contracts were announced, important East‐West relationships were established, and projects now being commenced are scheduled for completion in the next few years.

SOME indication of the extent to which the industry is now designing integral machined parts for production by routing is given by the range of components being produced at the works of Routing Ltd., Feltham. This company was formed from the routing department of Morfax Ltd., Mitcham, with which company it is still associated. Morfax still do the development work, and make the fixtures and other special tooling required by the production factory. An extension to the Feltham works is under construction.

Printed below is a selection of some of the many questions raised on the first day of the Corrosion Convention organized by CORROSION TECHNOLOGY at the Central Hall, Westminster, on October 15–16. Unfortunately, space does not permit full justice to be done to this important aspect of the Convention, so great were the number of questions and discussions instigated by the 13 papers which were read, covering a wide field of corrosion problems. A selection of questions arisng from the second day's papers will be published next month.