Thanks. My copy was actually the copy that they sent to J.D. Bernal, and was signed over to him "with the compliments of the authors". My father was another P

Thanks. My copy was actually the copy that they sent to J.D. Bernal, and was signed over to him "with the compliments of the authors". My father was another PhD student of Bernal's, and became Professor of Crystallography at Birkbeck later. The diagrams are scanned in from the original, but I re-typed the text for web presentation. It is astonishing how much of Computer Science was completely understood by the end of the war.