The atom bombs of World War II were bulky monsters weighing close to five tons. The B295 that atom-bombed Japan carried only one on each mission. But atom bombs have been getting smaller and handier. The Army's description last week of its atomic gun gives an idea of how small a modern atom bomb can be.
The gun's bore is 280 millimeters (11 in.). Since the vital parts of an atom bomb must be roughly spherical, the atomic explosive packed into the gun's shell is not likely to be much larger than a sphere eleven...
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