With a foreword by H. E. Taylor. with a foreword by A. D. Baxter. With a foreword by H. M. Barlow. With a foreword by W. E. Walters. With a foreword by W.V. Mayneord. With a foreword by I. I. Rabi. With a foreword by L. E. Sutton. With a foreword by E. J. Vaughan. With a foreword by F. A. Jackman. With a foreword by E. D. Hughes.