Word: seismographs
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Dates: during 1940-1949
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...anti-craft gun will be the one piece of artillery that may survive undamaged," Leet stated, "but there is a possibility that later adjustments to the seismograph may even strip this gun of its cloak of secrecy...
Finding that blasting near his laboratory recorded an entirely new wave on his seismograph, L. Don Leet, assistant professor of Seismology, has developed a new military technique that may greatly affect warfare in the future...
...seismograph enemy gun batteries can be located within ten minutes after they have fired, and can then be bombarded with mathematical accuracy...
...while he was working on the University observatory grounds at Oak Ridge that Leet first conceived of a new application of the delicate seismograph. Noticing extraordinary vibrations recorded on his instrument, he conducted search of the neighborhood and found that laborers were blasting nearby. At that point he decided to investigate artificial earthquakes caused by the dynamite...