I WOULD PARTICULARLY like to acknowledge the assistance provided to me in the writing of this book by Jorg Hensgen, whose meticulous editing contributed so much to the style and content of this work. I would also like to thank his readers, whose advice on matters of fact proved invaluable. Any remaining infelicities of style or content remain my own doing.
I would also like to take this opportunity to offer long overdue thanks to the ever-helpful and friendly staff of the British Library, and the Science Museum Library on Imperial College Campus, who have for many years assisted me in my researches.
P.S.