This 80-ton magnet at the University of California radiation laboratory in Berkeley on Nov. 30, 1935, develops a ray 14 times more lethal than X-rays and so powerful that approach closer than 50 feet is unsafe. Experience with the ray, a 4,500,000-volt beam of neutrons, the ultimate particles of atoms, are being conducted under a method discovered here by Prof. E.O. Lawrence. Unpredictable possibilities are reported to be involved in the ray. (AP Photo/EHK)

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