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Show Potency of Deadly Sound Waves Shown A "death-noise" instead of a "death-ray," "death-ray," was the phenomenon discussed recently before the National Academy of Science, by Prof. R. A. Wood and Alfred L. Loomis of the Johns Hopkins Hop-kins university. The "death-noise" would have been inaudible to human ears, but it consisted of sound waves, just the same, and it killed small fishes and other aquatic animals In vessels of water, in less than a minute. min-ute. The two researchers generated exceedingly high-frequency sound waves by means of electrical apparatus. appara-tus. The waves were produced at a rate of from 100,000 to 400,000 to the second. The upper limit of audibility to human ears is between 20,000 and 30,000. If a beam of these sound waves is directed toward the surface of the water, Professor Wood said, the surface is heaped up in a mound. The vibrations heat the water, a rise of nearly 10 degrees Fahrenheit In one minute having been recorded. |