by A. R. Stokes. With a foreword by Sir John Randall. by H. A. Thomas ; with a foreword by Sir E.V. Appleton. by B. J. Chalmers. With a foreword by T. H. Mason. by F. C. Orchard, with a foreword by H. C. Harland. by J.S. Marsh ; with a foreword by John Johnston. by D.J. Finney ;with a foreword by F. Tattersfield. by W.V.D. Hodge ; with a foreword by Michael Atiyah. by A.G. Warren ; with a foreword by Alexander Russell. E. M. H. Lips, with a foreword by G. V. Stabler. R. L. Aston, with a foreword by John F. Alcock.