Little Boy was developed by Lieutenant Commander Francis Birch's group of Captain William S. Parsons's Ordnance (O) Division at the Manhattan Project's Los Alamos Laboratory during World War II. Parsons flew on the Hiroshima mission as weaponeer. The Little Boy was a development of the unsuccessful Thin Man nuclear bomb. Like Thin Man, it was a guntype fission weapon, but derived its explosive power from the nuclear fission of uranium235. This was accomplished by shooting a hollow cylinder of uranium over another hollow enriched uranium cylinder by means of a charge of nitrocellulose propellant powder. It contained 64 kg (141 lb) of enriched uranium, of which less than a kilogram underwent nuclear fission. Its components were fabricated at three different plants so that no one would have a copy of the complete design.
ImplosionType Fission
The name Fat Man refers generically to the early design of the bomb, which was also known as the Mark III. Fat Man was an implosiontype nuclear weapon with a plutonium core. The first to be detonated was the Gadget, in the Trinity nuclear test, less than a month earlier on 16 July at the Alamogordo Bombing and Gunnery Range in New Mexico. This bomb was identical in most respects to the Fat Man used at Nagasaki.

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