The story of the development of the atomic bomb by the combined efforts of many groups in the United States is a fascinating but highly technical account of an enormous enterprise. Obviously military security prevents this story from being told in full at this time. However, there is no reason why the administrative history of the Atomic Bomb Project and the basic scientific knowledge on which the several developments were based should not be available now to the general public. To this end this account by Professor H. D. Smyth is presented.
Manhattan Project History
Manhattan Project History
October 15, 1945
Dear Mr. Gillespie,
By Harold Agnew
By George Cowan
I think there are issues which are quite simple and quite deep, and which involve us as a group of scientists—involve us more, perhaps than any other group in the world. I think that it can only help to look a little at what our situation is—at what has happened to us—and that this must give us some honesty, some insight, which will be a source of strength in what may be the not-too-easy days ahead. I would like to take it as deep and serious as I know how, and then perhaps come to more immediate questions in the course of the discussion later.
Bureau of Public Relations
EYE WITNESS ACCOUNT
ATOMIC BOMB MISSION OVER NAGASAKI
WITH THE ATOMIC BOMB MISSION TO JAPAN, AUGUST 9
We are on our way to bomb the mainland of Japan. Our flying contingent consists of three specially designed B-29 Superforts, and two of these carry no bombs. But our lead plane is on its way with another atomic bomb, the second in three days, concentrating its active substance, and explosive energy equivalent to 20,000, and under favorable conditions, 40,000 tons of TNT.
August 6, 1945
STATEMENT OF THE SECRETARY OF WAR
THE WHITE HOUSE
IMMEDIATE RELEASE —August 6, 1945
STATEMENT BY THE PRESIDENT OF THE UNITED STATES
Sixteen hours ago an American airplane dropped one bomb on Hiroshima, an important Japanese Army base. That bomb had more power than 20,000 tons of T.N.T. It had more than two thousand times the blast power of the British “Grand Slam” which is the largest bomb ever yet used in the history of warfare.
Summary of Target Committee Meetings
May 10 and 11, 1945
Declassified government document
Memorandum from Major J. A. Derry and Dr. N. F. Ramsey to General L. R. Groves
Status of Targets
- Kenneth Bainbridge: "No one who saw it could forget it, a foul and awesome display."
- Enrico Fermi: "About 40 seconds after the explosion, the air blast reached me. I tried to estimate its strength by dropping from about six feet small pieces of paper before, during, and after the passage of the blast wave.