sponsored by the Power Industries Division of the Institution of Mechanical Engineers. spnsored by the Power Industries Division of the Institute of Mechanical Engineers. sponsored by the Automobile Division of the Institution of Mechanical Engineers. sponsored by the Power Industries Division of the Institution of Mechanical Engineers, London, 14 May 1981. sponsored by the Process Industries Division of the Institution of Mechanical Engineers, 19 November 1980. sponsored by the Tribology Group of the Institution of Mechanical Engineers. sponsored by the Tribology Group and The Automobile Division of the Institution of Mechanical Engineers. sponsored by Electronics Division, The Institution of Electrical Engineers. sponsored by The Tribology Group of The Institution of Mechanical Engineers. sponsored by the North-Eastern Centre of the Institution of Electrical Engineers.