330-PSA-399-60 (164707AC):  Nuclear Weapon “Little Boy” type, the kind that detonated over Hiroshima, Japan, August 6, 1945.  The bomb is 28 inches in diameter and 120 inches long.  The first nuclear weapon ever detonated in war, it weighed about 9,000 pounds and had a yield equivalent to approximately 20,000 tons of high explosives.  Photograph courtesy of Los Alamos Scientific Laboratory.   Photograph released December 1960.  (9/15/15).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/127906254@N06">National Museum of the U.S. Navy</a>
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