This is a replica of the Bombe designed by Alan Turing's team at Bletchley Park. The Bombe was used to decypher the German Enigma encoded communication during World War 2. Seeing this incredible Electro-Mechanical machine doing it's thing was pretty damn cool. See here for more information on this cool machine which is housed at the Bletchley Park museum in Milton Keynes. More information is here: https://en.wikipedia.org/wiki/Bombe