With a foreword by R. H. Evans. With a foreword by H. R. Ing. With a foreword by I. I. Rabi. with a foreword by A. D. Baxter. With a foreword by E. D. Hughes. With a foreword by E. J. Vaughan. With a foreword by F. A. Jackman. With a foreword by W. E. Walters. With a foreword by F.G. Hopkins. With a foreword by H. E. Taylor.