Max Newman was a mathematician and codebreaker at Bletchley Park. He was given the job of working out how a machine could break "Tunny" messages. The machine would do a calculation for many possible start positions of the χ wheels. The start position that gave the largest count from this calculation was likely to be the right one. The first machine was called "Heath Robinson". This did not work very well. It had two punched paper tapes that had to work exactly together. One tape contained the ciphertext in a continuous loop. The second looped tape contained patterns made by the wheels of the coding machine. The tapes would often stretch or break when going at 2000 characters each second. Sometimes the tapes would not line up; then the counts were wrong.