by I.G. Kesaev. With a foreword by Jerome Rothstein. by J.S. Marsh ; with a foreword by John Johnston. by A.G. Warren ; with a foreword by Alexander Russell. by H. A. Thomas ; with a foreword by Sir E.V. Appleton. by G. V. Samsonov ; With a foreword by Henry H. Hausner. by A. R. Stokes. With a foreword by Sir John Randall. by B. J. Chalmers. With a foreword by T. H. Mason. by D.J. Finney ;with a foreword by F. Tattersfield. by W.V.D. Hodge ; with a foreword by Michael Atiyah. by A.G. Ganydon,With a foreword by Sir Alfred Egerton.