Today’s Document from the National Archives

Document for July 16th:
"Eye-Witness Account of the Trinity Shot" by L. W. Alvarez


Eyewitness Account of the Trinity Explosion, 07/16/1945 (National Archives Identifier: 594933); File Unit: Trinity, 1945; Records of the Office of Scientific Research and Development, 1939 - 1950; Record Group 227; National Archives.

This is a typewritten account of the detonation of "Trinity," the first atomic device, on July 16, 1945, written by physicist Luis W. Alvarez, who witnessed it from a B-29 aircraft flying 24,000 feet over the site. In this report, Alvarez comments upon the detonation itself, the formation of the mushroom cloud, and the observations of the shock wave by the pilot and other passengers in the aircraft.
More on Truman's decision to drop the Atomic bomb...
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Map from Zebulon Pike’s Notebook

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