The Nazi messages produced on a Lorenz machine were far more challenging for the Bletchley Park code breakers. The Bombe designed for Enigma messages was not of much use. They designed an electromechanical machine specifically for the Lorenz code, but it was far too slow to decode the growing volume of Lorenz messages. So Bletchley Park adopted the electronic machine that was designed and built at the telephone research laboratory, and called it Colossus.
This picture shows half of the computer, including the tape reader at the other end. There is a second set of floor-to-ceiling equipment racks behind the ones seen here.
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