The Turing Guide

NOTES TO PAGES 120–141 | 495

65. Turing (1940), p. 317.


66. Turing (1940), p. 316 (emphasis added).


67. Alexander (Note 42), pp. 87, 89.


68. Alexander (Note 42), p. 89.


69. ‘Squadron-Leader Jones’ Section’ (Note 16), p. 4.


70. Turing (1940), p. 319.


71. ‘Squadron-Leader Jones’ Section’ (Note 16), p. 2.


72. Joan Clarke’s words: see Murray (Note 6), p. 43.


73. Murray (Note 6), p. 43.


74. Murray (note 6), pp. 43–4.


75. Turing (1940), pp. 320–31; Welchman (Note 26), Appendix 1.


76. C. A. Deavours and L. Kruh, ‘The Turing bombe: was it enough?’, Cryptologia, 14 (1990), 331–49,
    pp. 346–8.


77. Turing (1940), p. 327.


78. ‘Operations of the 6812th’ (Note 7), p. 59.


79. Turing (1940), p. 319.


80. ‘Operations of the 6812th’ (Note 7).


81. ‘Squadron-Leader Jones’ Section’ (Note 16), p. 7.

CHAPTER 13 INTRODUCING BANBURISmUS (SImPSON)

1. C. H. O’D. Alexander, ‘Cryptographic history of work on the German Naval Enigma’, (c.1945),
   NA HW25/1 and The Turing Archive for the History of Computing (http://www.AlanTuring.net/
   alexander_naval_enigma).


2. A. P. Mahon, ‘The history of Hut Eight, 1939–1945’, (1945), NA HW25/2 and The Turing Archive for
   the History of Computing (http://www.AlanTuring.net/mahon_hut_8.). I am much indebted to Ralph
   Erskine for guiding me through these texts and helping me to cover the ground.


3. See also Steven Hosgood’s thorough examination on stoneship.org.uk/-steve/banburismus.html.


4. The Bletchley Park ‘Cryptographic dictionary’ (1944): http://www.codesandciphers.org.uk/documents/
   cryptdict.


5. Mahon (Note 2).


6. William Legrand deciphered a stream of mixed numbers and symbols, without word-breaks, to find
   Captain Kidd’s treasure buried near Charleston, South Carolina.


7. G. U. Yule, The Statistical Study of Literary Vocabulary, Cambridge University Press (1944).


8. S. Padua, The Thrilling Adventures of Lovelace and Babbage, Particular Books (2015).


9. D. L. Moore, Ada, Countess of Lovelace, John Murray (1977).


10. Hinsley & Stripp (1993).


11. Mahon (Note 2).


12. Alexander (Note 1).


13. Eileen Johnson (nee Plowman), private communication.


14. Christine Brose (nee Ogilvie-Forbes), private communication.


15. Iris King (nee Brown), private communication; the winter of 1941–42 was the coldest European win-
    ter of the twentieth century.


16. Alexander (Note 1).


17. Copeland et al. (2006).


18. Hilary Pownall (nee Law), private communication.


19. A. J. (Tony) Phelps, private memoir.


20. Brose (Note 14).


21. http://www-history.mcs.st-and.ac.uk/Biographies/Clarke_Joan.html.


22. Mahon (Note 2).


23. Copeland (Note 17).