ACKNOWLEDGMENTS are due to Trafford Park Estates Ltd. for permission to reproduce the frontispiece, the original letter facing page 1, and the map of Trafford Park; to the Westinghouse Electric Corporation for the portrait of Newcomb Carlton; and to The Institution of Mechanical Engineers for the photograph of Stelna bomb disposal equipment. Also to the Westinghouse Electric Corporation and its associates in London and Paris, to the Westinghouse Brake and Signal Co. Ltd., and to C.A.Parsons and Co Ltd. for providing useful information.

The portraits of Sir Holberry Mensforth and of Miles Walker are by Lafayette, and that of Sir Felix J.C.Pole is by Elliott and Fry.