The Atomic Bombing of Hiroshima and Nagasaki features a letter written by Luis Alvarez a physicist who worked on the Manhattan Project on August 6 1945 after the first atomic bomb was dropped on Hiroshima Japan.

What atomic bomb was dropped on nagasaki. It was the second of the only two nuclear weapons ever used in warfare the first being Little Boy and its detonation marked the third nuclear explosion in history. On the other hand the second atomic bomb that was dropped on Nagasaki Thursday August 9 1945 was called the Fat Man. Fat Man is the codename for the type of nuclear bomb that was detonated over the Japanese city of Nagasaki by the United States on 9 August 1945.

The first atomic bomb Little Boy which had the gun type configuration was dropped on Hiroshima on August 6 1945. The Second Atomic Bomb Destroys Nagasaki. Photograph courtesy National Archives and Records.

Three days later a second B-29 dropped another A-bomb on Nagasaki killing an estimated 40000 people. August 9 1945. On 6 August 1945 at 0815 Japanese time an American B-29 bomber plane named Enola Gay dropped an atomic bomb on Hiroshima.

Exactly 70 years ago the US dropped the atomic bomb nicknamed Little Boy on Hiroshima killing 140000 of its 350000 citizens. National Archives Identifier 535795. The US B-29 Superfortress Bockscar dropped the atomic bomb nicknamed Fat Man which detonated above the ground on northern part of Nagasaki just after 11 am.

Department of Defense Nagasaki Japan 1945 after the atomic bomb. Three days later a second bomb Fat Man was dropped on Nagasaki. It has been 76 years since the atomic bomb was dropped on Nagasaki in 9 days.

The first man made reactor from the University of Chicago was employed that used extremely pure. The different assembly methods for atomic. In August of 1945 the American military was preparing plans for the upcoming invasion of mainland Japan.