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Show Death Ray' Proves Able To Cause Brain Fatigue BERKELEY, CALIF. A death ray developed by an American naval officer it kills bacteria at a distance of six inches can cause mental fatigue fa-tigue in humans, it was revealed. It is a magnetic device which produces pro-duces 9,300 vibrations a second. This frequency is just within the upper limit of human hearing. It produces an extremely high-pitched shriek which can be heard a block away. There are several other types of vibrator vi-brator which can kill microscopic life at short distances. The machine was built by Commander Com-mander A. P. Krucger, head of the navy's first mobile medical research unit Individuals who stand close to the ! machine longer than a few minutes . at a time become mentally weary. Commander Kruecr said. They ; lose some of their ability to do math-I math-I ematical problems. This cH |