Foreign Relations of the United States, The Conferences at Washington, 1941–1942, and Casablanca, 1943

Hopkins Papers

The Prime Ministers Principal Private Secretary (Martin) to the President’s Special Assistant (Hopkins)

private and personal

[Casablanca,]¹ January 23, 1943.

Mr. H. Hopkins.

You asked me to send you a reminder about Tube Alloys—disclosure of information to United Kingdom and Canada.²

J. M. Martin

1. The letter-head is “10 Downing Street, Whitehall.”

2. No official record has been found of any discussion at Casablanca of the atomic bomb project. In a telegram to Hopkins on February 16, 1943, Churchill, however, did remind Hopkins of a conversation they had had on the subject, presumably during the Casablanca Conference. Churchill’s message read as follows:

   “Do you remember our conversation about that very secret matter we called “Tube Alloys” which you told me would be put right as soon as the President got home? I should be grateful for some news about this, as at present the American War Department is asking us to keep them informed of our experiments while refusing altogether any information about theirs.” (Hopkins Papers)