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Copy of the blueprints for ‘Little Boy,’ the atomic bomb dropped over Hiroshima, 24 x 18, signed in the lower left corner, “Morris Jeppson, Weapon Test Officer, Enola Gay Mission, Hiroshima, 6 Aug. 1945.” Jeppson adds handwritten notations explaining the main different parts of this atomic bomb. In blue ink, he draws arrows labeling the “Little Boy Bomb, Weight about 5 tons,” "target U235,” “hook to hang bomb from B29,” “gun barrel,” “projectile U235,” and “tail fins.” On the margin, he explains: “The design of Little Boy used the gun assembly method. The bullet of U235 impacting the target of U235 produces a critical mass in a very short period of time – and the heavy nose casing contains critical conditions long enough for the nuclear reaction to proceed. During the flight I removed 3 green electrical plugs and replaced them with red coded plugs. This allowed the detonation voltage to go from fusing to the explosive that fired the projectile of U235 into the target of U235 when the bomb reached about 1500 feet above Hiroshima.” Rolled and in fine condition. Little Boy was the code name of the atomic bomb that was dropped on Hiroshima on August 6, 1945, by the 12-man crew of the B-29 Superfortress Enola Gay. Jeppson was one of only two men who were both at Los Alamos during the development and testing of the bomb and also on board the Enola Gay when it dropped the bomb.
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