A number of people have helped in the task of producing this book and their help is gratefully acknowledged. The drawings in chapter two were done by Barrie Doggett. The drawings in chapters three and four and the axonometric detail drawings in the remaining chapters were done by Peter O’Malley. All other drawings in the book, including the main axonometric drawings, were done by Michael L.C. Ong. Typing was speedily carried out by Josie Murphy and Margaret Sanders. Photo reductions were done by Ian Pope and photographic processing was done by David Buss. The book design is by Theresa Orton.