"when the bomb reached about 1500 feet above Hiroshima"

Jeppson, Morris, Second Lieutenant in the United States Army Air Forces during World War II (1922-2010). Annotated blueprint of the "Little Boy" atomic bomb.

No place, probably 1970s.

609 x 456 mm.

 5,000.00

Morris Jeppson's hand-annotated blueprint of the "Little Boy" atomic bomb. Jeppson designates parts of the bomb and writes, in part: "During the flight I removed 3 green electrical plugs and replaced them with red coded plugs. This allowed a 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".

Signed "Morris Jeppson / Weapon Test Officer / Enola Gay Mission / HIROSHIMA 6 Aug. 1945".

Jeppson served as assistant weaponeer on the Enola Gay, which dropped the first atomic bomb on the city of Hiroshima, Japan on 6 August 1945.