http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB162/72.pdf
Memo of a telephone conversation between a Colonel Seaman of the Manhattan Project, and General Hull, of Marshall’s staff, outlining the production schedule. Basically, the US intended to produce one atomic bomb roughly every 10 days, and use them against Japan. But Marshall was aware that there would be an issue of “diminishing returns” involving the use of the atomic bombs.
http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB162/index.htm
"While Groves was making plans for the use of a third atomic weapon sometime after 17 August, depending on the weather, Marshall’s note on this memo shows that he was following Truman’s instructions to halt nuclear strikes: “It is not to be released over Japan without express authority from the President.”
http://www.japanfocus.org/-Yoichi-Funabashi/1757
Stanford University professor Barton Bernstein, a prominent scholar in the history of atomic bombs, writes in an essay titled “Eclipsed by Hiroshima and Nagasaki”: “Had the surrender not arrived at the 14th and if the war had dragged on into the next week, (Harry) Truman would undoubtedly have used at least one more A-bomb on a city and probably even more cities or other targets. If such nuclear pummeling did not soon produce the desired surrender, and if Truman did not retreat to offer softer surrender terms, Marshall’s loose plan for tactical nuclear usage with the Kyushu invasion might have looked attractive to the White House.”
http://www.economicexpert.com/a/Atomic:bombings:of:Hiroshima:and:Nagasaki.htm
From Dan Ford’s old web site:
"In an August 2002 interview with Studs Terkel published in the British Guardian newspaper, Paul Tibbetts recalled something similar: “Unknown to anybody else–I knew it, but nobody else knew–there was a third one. See, the first bomb went off and they didn’t hear anything out of the Japanese for two or three days. The second bomb was dropped and again they were silent for another couple of days. Then I got a phone call from General Curtis LeMay. He said, ‘You got another one of those damn things?’ I said, ‘Yessir.’ He said, ‘Where is it?’ I said, ‘Over in Utah.’ He said, ‘Get it out here. You and your crew are going to fly it.’ I said, ‘Yessir.’ I sent word back and the crew loaded it on an airplane and we headed back to bring it right on out to Tinian and when they got it to California debarkation point, the war was over.”
Plus from the book “Downfall” p 303 by Richard Frank
There was a third atomic bomb target. The next bomb would be ready by August 21st and the six targets on the list in order of priority were:
- Sapporo
- Hakodate
- Oyabu
- Yokosuka
- Osaka
- Nagoya
So a good chance Sapporo would have had an instant sunrise if Japan had not surrendered.
PLUS:
In the NARA files General Groves’ memos to General Marshall exist.
Leslie R. Groves’ Memo to the
Chief of Staff (George C. Marshall)
30 July 1945
MEMORANDUM TO THE CHIEF OF STAFF
(a few paragraphs after Groves describes the successful Trinity test to Marshall)
-
There is a definite possibility, [sensitive information deleted] as we increase our rate of production at the Hanford Engineer Works, with the type of weapon tested that the blast will be smaller due to detonation in advance of the optimum time. But in any event, the explosion should be on the order of thousands of tons. The difficulty arises from an undesirable isotope which is created in greater quantity as the production rate increases.
-
The final components of the first gun type bomb have (already) arrived at Tinian, those of the first implosion type should leave San Francisco by air-plane early on 30 July. I see no reason to change our previous readiness predictions on the first three bombs. In September, we should have three or four [more] bombs. One of these will be made from (U) 235 material and will have a smaller effectiveness, about two-thirds that of the test type, but by November, we should be able to bring this up to full power. There should be either four or five bombs in October, one of the lesser size. In November there should be at least five bombs [more], and the rate will rise to seven in December and increase decidedly in early 1946. By some time in November, we should have the effectiveness of the (U) 235 implosion type bomb equal to that of the tested plutonium implosion type.
-
By mid-October we could increase the number of bombs slightly by changing our design now to one using both materials in the same bomb. I have not made this change because of the ever present possibilities of difficulties in new designs. We could, if it were wise, change our plans and develop the combination bomb. But if this is to be done, it would entail an initial ten-day production setback which would be caught up in about a month’s time; unless the decision to change were made before August 1st, in which case it would probably not entail any delay. From what I know of the world situation, it would seem wiser not to make this change until the effects of the present bomb are determined.
L.R. GROVES
Major General, U.S.A.
Source: Manhattan Engineer District – Top Secret (de-classified), Manhattan Project File, Folder 4, Trinity Test, National Archives, Washington, D.C.
In short, we could have had seveal bombs and just about vaporized every Japanes major city… one by one.
Deaf