Cryptanalysis of the Enigma Bletchley Park to describe the network that used the same Enigma setting sheets. Initially these were recorded using coloured pencils and were given the names "red", "light blue" etc., and later the names of birds such as "kestrel". During World War II the settings for most networks lasted for 24 hours, although towards the end of the war, some were changed more frequently. The sheets had columns specifying, for each day of the month, the rotors to be used and their positions, the ring positions and the plugboard connections. For security, the dates were in reverse chronological order down the
That Was the Week That Was who are hanging from the branches of the tree ...") accompanied by minstrel singers in blackface ("... we hate all the darkies and the Catholics and the Jews / Where we welcome any man / Who is strong and white and belongs to the Ku Klux Klan"), thus parodying "The Black and White Minstrel Show", which was then being shown on the BBC despite accusations of racism over its use of blackface. On Saturday, 20 October 1962 the award of Nobel prizes to John Kendrew and Max Perutz, and to Francis Crick, James D. Watson, and Maurice Wilkins was satirised