[by] C. R. Simmons; with a foreword by R. W. Stuart Mitchell. by Ivor Jenkinsm,with a foreword by C. J. Smithells. E. M. H. Lips, with a foreword by G. V. Stabler. by D.J. Finney ;with a foreword by F. Tattersfield. by F. C. Orchard, with a foreword by H. C. Harland. by A.G. Warren ; with a foreword by Alexander Russell. by B. J. Chalmers. With a foreword by T. H. Mason. by A. R. Stokes. With a foreword by Sir John Randall. by G. V. Samsonov ; With a foreword by Henry H. Hausner. by H. A. Thomas ; with a foreword by Sir E.V. Appleton.