Trinity Test Site, Gadget Arrives at Tower, 1945

Gadget at base of tower. Assembly of the nuclear capsule began on July 13 at the McDonald Ranch House, where the master bedroom had been turned into a clean room. The polonium-beryllium Urchin initiator was assembled, and Louis Slotin placed it inside the two hemispheres of the plutonium core. Cyril Smith then placed the core in the uranium tamper plug. Air gaps were filled with 0.5-mil (0.013 mm) gold foil, and the two halves of the plug were held together with uranium washers and screws which fit smoothly into the domed ends of the plug. The completed capsule was then driven to the base of the tower. Assembly was completed at about 16:45 on July 13, 1945. The Manhattan Project was a research and development program by the US with the UK and Canada that produced the first atomic bomb during WWII

Picture No

12698604

Media ID

48540487

Size

4200px x 3253px (5.1MB)

Credit

LANL/Science Source/Mary Evans

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No Model Release