Editorial Note
No official record of the substance of these conversations has been found. According to Churchill, Hinge of Fate, p. 377, some informal discussions were held while Roosevelt drove Churchill about the Hyde Park estate in his specially equipped automobile. Churchill recalls that the discussion of American-British cooperation in the development of an atomic weapon was postponed until the following day. Thompson, who accompanied the two leaders on this automobile tour, wrote a vivid description which appears in Pawle, The War and Colonel Warden, pp. 167–168. According to the account in William D. Hassett, Off the Record with F.D.R., 1942–1945 (New Brunswick: Rutgers University Press, 1958), p. 64, Roosevelt and Churchill conferred at length after lunch.