The 'bombe' machine 'Christopher' seen in the film, is based on a replica of Alan Turing's original machine, which is housed in the museum at Bletchley Park. Production designer Maria Djurkovic admitted, however, that it was made a little more cinematic by making it larger and having more of its inside mechanisms visible. It is neither a Turing Machine, which is the imaginary subject of his 1937 paper "On Computable Numbers," nor is it a computer. The 'bombes' were not physically built by Turing, but were housed in huts 11 and 11A at Bletchley Park. They ran at twenty "clicks" per second, not the much slower rate in the film.

Film

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