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COMPARED with most other industries a distinguishing feature of the air transport business throughout its history has been the rapid development and replacement of its flying equipment. Aircraft have evolved to meet the needs of expanding traffic and each generation has been succeeded by different, newer and better versions. The thirties saw the appearance of the all metal monoplane with piston engines and propellers. As we all know this was developed to a high degree during the World War II years and afterwards culminating by the early fifties in such aircraft as the DC‐6, DC‐7 and Constellation series among many. During the fifties the turboprop emerged in successful aircraft such as the Viscount, Vanguard, Electra and Britannia but at the end of that decade the turbojets entered the picture — first at long ranges and then progressively over shorter stages during the sixties. Speed (Fig. I) and size (Fig. 2) have all increased with time, of course, and, no less important, what might be considered less obvious factors such as operating cost, reliability and maintainability have all improved as well. In parallel with and indeed essential to this process there has been a perhaps even more remarkable development in propulsion systems as illustrated in Figs. 3 and 4 and there is no need to elaborate on these at this point.

PADIS‐ODE, described in MRN Vol. 3, Nos. 1 and 3, 1980, was developed to allow each separate aspect of any policy decision to be properly worked out in professional studies, and to provide formal means for communicating meaningfully to others the degree of risk that may remain in any policy as defined.

IT WAS A BIT OF BAD LUCK FOR THE SPONSORS THAT THIS NEW production of what was formerly the Special Films Division of AB Pathé should have had its press preview on 10 November, the day that the Rolls‐Royce crisis made news. For Rolls‐Royce was the subject of one of the three major examples of successful marketing around which this film was constructed; the other two were Simon Engineering and Viners Limited. The importance attached to their respective marketing performances was summarised by Trevor Philpott at the end of the film.

Film provides an alternative medium for assessing our interpretations of cultural icons. This selective list looks at the film and video sources for information on and interpretations of the life of Woody Guthrie.

Blues music is in the midst of its second revival in popularity in roughly thirty years. The year 1960 can be identified, with some qualification, as a reference point for the first rise in international awareness and appreciation of the blues. This first period of wide‐spread white interest in the blues continued until the early seventies, while the current revival began in the middle 1980s. During both periods a sizeable literature on the blues has appeared. This article provides a thumbnail sketch of the popularity of the blues, followed by a description of scholarly and critical literature devoted to the music. Documentary and instructional materials in audio and video formats are also discussed. Recommendations are made for library collections and a list of selected sources is included at the end of the article.

This paper focuses on the role of myth in group identity maintenance. It begins by looking at the occupational group, but broadens to show how subsociety and the larger society affected the group's identity and actions. Mississippi Delta blues performers’ use of myth serves as the historical example, and this analysis shows how the group reacted to living in a segregated and racist society. Analysis of songs demonstrates how myth can play a role in tying together this subordinated group in society and perpetuate myth. How the blues subculture still employs these myths today is also addressed.