8 "It really is a gas engine": Ibid., p. 13.

9 "Alan had no friend": Ibid., p. 23.

Chapter Two.

1 "can be anything: a distance": Mollenhoff, p. 29.

2 "in essence a variable-speed gear": Hartree, quoted in Barnet, paragraph 12.

3 "The advantages of the method": Atanasoff and Brandt, abstract, p. 83.

4 "the properties of vacuum tubes": Welch, http://ed-thelen.org/comp-hist/TheCompMusRep/TCMR-V12.html.

5 "a power supply and electric motor": Ibid.

6 "Don't worry about people stealing your ideas": "Howard Hathaway Aiken," http://www.answers.com/topic/aiken-howard.

7 "when the family's enormous vegetable garden": Burton, p. 86.

8 "I had been forced to the conclusion": Ibid., p. 89.

9 "represented an elegant and powerful symbolism": Hodges, p. 112.

10 "was not only a matter of abstract mathematics": Ibid., p. 107.

Chapter Three.

1 "I have traced my ancestry back": Zuse, p. 1.

2 "Given my many detours": Ibid., p. 21.

3 "on all sides now": Ibid., p. 30.

4 "The psychological effect": Ibid., p. 31.

5 "When I began to build": Ibid., p. 34.

6 "which took money": Ibid., p. 35.

7 "pasted the paper": Ibid., p. 36.

8 "It took up almost the entire living room": Ibid.

9 "I don't want to discourage you": Ibid., p. 42.

10 "To construct large and expensive computing machines": Ibid., p. 43.

11 "I was in such a mental state": Mollenhoff, p. 157.

12 "When I finally came to earth": Burton, pp. 3435.

13 "For fifteen days I strove": Andreasen, p. 43.

14 "The changes of travel": Ibid., p. 44.

15 "most of the time that we speak": Ibid., p. 78.

16 "I would hypothesize": Ibid.

17 "I chose small condensers": Mollenhoff, p. 35.

Chapter Four.

1 "I ... was of the opinion": Zuse, p. 38.

2 "It is not true": Ibid., p. 55.

3 "We did not dare": Burton, p. 100.

4 "It could just add and subtract": Ibid., p. 102.

5 "The idea would be": Hodges, p. 141.

6 "should interfere as little as possible": Leavitt, p. 136.

7 "I was in Berlin": Flowers, "D-Day at Bletchley Park," pp. 8182.

8 "Thomas Harold Flowers": "Tommy Flowers-Technical Innovator," http://www.bbc.co.uk/dna/h2g2/A1010070.

Chapter Five.

1 "was the right person": Hodges, p. 181.

2 "the geese who laid": Roberts, p. 348.

3 "by the end of 1939": Ibid., p. 37.

4 "What do you mean": Zuse, p. 58.

5 "performed flawlessly": Ibid., p. 61.

6 "It was a jaw-dropping accomplishment": Gustafson, personal communication, April 5, 2010.

7 "Available were unskilled": Zuse, p. 65.

8 "What should I be doing now?": McCartney, p. 30.

9 "used vacuum tube circuits": Ibid., p. 36.

10 "would send problems over": Gustafson, interview, February 22, 2010.

11 "masked the unnerving sound": McCartney, p. 41.

12 "If you're going to come": Ibid., p. 42.

13 "Is there any objection": Burton, pp. 12627.

14 "Our attorney has emphasized": Ibid., p. 128.

15 "Notorious for his idiosyncrasies": Wansell, http://www.dailymail.co.uk/news/article-1212910/How-Britain-drove-greatest-

genius-Alan-Turing-suicide-just-gay.html.

16 "Before the war": Hodges, pp. 21415.

17 "the operation of fifteen U-boats": Ibid., p. 222.

Chapter Six.

1 "his unusual imagination": Burton, p. 134.

2 "an electronic device": Ibid., p. 138.

3 "None of us had much confidence": McCartney, p. 51.

4 "size, destinations, and departure times": Roberts, p. 367.

5 "The Admiral at Halifax": Hodges, p. 261.

6 "they found their outlook": Ibid., p. 251.

7 "A machine could be designed": McCartney, p. 48.

8 "Eckert acquired some mice": Ibid., p. 76.

9 "He looked Atanasoff in the eye": Burton, p. 144.

10 "We had a tube fail": Randall, http://www.computerworld.com/s/article/print/108568/Q_A_A

_lost_interview_with_ENIAC_co_inventor_J._Presper_Eckert.

11 "Even as I was putting it together": Zuse, p. 71.