Bletchley Park

Source E is a picture of a German Enigma machine used to encrypt the Axis messages. This shows us what the machine looked like to encrypt the message, but tells us nothing on how the messages were decrypted. However, we know that the machine was very complex, but from the picture you cannot tell how complex it really was. The Enigma machine mechanically turned messages into code, and when this code is re-typed back into the machine it reveals the original message again. The Enigma machine copy, the Allies had, helped Bletchley Park develop a way to break the codes as they could see how the machine worked. Although we know that the machine helped intelligence staff, we do not actually learn anything about the decoding just from a picture of the Enigma machine.

To conclude, neither source give us any detail into how the Enigma codes were decoded, but more into the factors which helped the process along. Source D is about translation of the codes, not decoding, and Source E is a photograph of the Enigma machine which helped the Bletchley Park staff find a way to decode the Enigma, but was not actually involved in the process.