Enrico Fermi mans the controls as University of Chicago's atom smasher undergoes a trial run. The 100-million volt betatron is housed in the University's accelerator building across the street from Staff Field where the first nuclear chain reaction was achieved. Chicago, IL, 5/50.

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Keywords: atom, betatron, bomb, chain, chicago, enrico, equipment, fermi, nuclear, reaction, run, scientist, smasher, trial, university