The Turing Guide

122 | 12 BOmBES The letter to which E is connected is called E’s ‘plugboard-mate’ (Turing’s term was E’s ‘Stecker value’). It is ...

COPElAND | 123 In Hut 6 or Hut 8 the bombe’s hypotheses were examined and tested on a replica Enigma. The codebreaker typed ciph ...

124 | 12 BOmBES tested simultaneously without any parts of the machine moving’.^70 Running a job on Victory without simultaneous ...

VAlENTINE | 125 this manual gave examples of menus containing three or more loops.^80 The codebreakers are known to have recorde ...

126 | 12 BOmBES that we don’t know about ourselves’, they said. ‘We haven’t been told, so we can’t pass it on to you—but we have ...

VAlENTINE | 127 Company had expanded its operations into the factory next door to their own, where previously Spirella corsets h ...

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CHAPTER 13 Introducing Banburismus edward simpson O nce the bombes got going, they made a massive electromechanical attack on th ...

130 | 13 INTRODUCING BANBURISmUS figure 13.1 A Banbury. National Archives ref. HW 40/264. Crown copyright and reproduced with pe ...

SImPSON | 131 forward by Hugh Alexander’s leadership and ingenuity in method—multiplied in manifold ways the quantity of naval i ...

132 | 13 INTRODUCING BANBURISmUS But it could not be used in all circumstances. Work on Army and Air Force Enigma could not use ...

SImPSON | 133 advantage. Edgar Allan Poe observed in The Gold Bug, his most popular short story, published in 1843, that: It may ...

134 | 13 INTRODUCING BANBURISmUS notes to be played and identified where the pegs should be placed to play them. In modern terms ...

SImPSON | 135 At first the placing of messages correctly in depth by counting the repeats between them was probably done by writ ...

136 | 13 INTRODUCING BANBURISmUS figure 13.2 The Banburies found in the roof: Banbury One. Reproduced with permission of the Ble ...

SImPSON | 137 figure 13.3 The Banburies found in the roof: Banbury Two. Reproduced with permission of the Bletchley Park Trust. ...

138 | 13 INTRODUCING BANBURISmUS used in Hut 8, but Hut 6’s operations did not involve ‘punching’ and ‘shoving’. It thus seems l ...

SImPSON | 139 hole with a light below. Sliding the paper along, you punched a confetti-sized hole on each pencil mark. You took ...

140 | 13 INTRODUCING BANBURISmUS Alexander’s history stated that a four-letter repeat was 100 times as likely to occur in German ...

SImPSON | 141 is incapable of simple explanation. It is valid (although trite) to liken explaining it to describ- ing chess to s ...