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Show Sounds Differ in Speed. Very loud sounds travel through the air more rapidly than ordinary sounds. Dr. Dayton C. Miller of the Case School of Applied Science, who has been experimenting with big guns, finds that the noise of their explosion travels 1,210 feet in the first second, or exactly 22 per cent more rapidly ! than low sounds. Two hundred feet from the source of sound, however, j the speed Is only 5 per cent more than normal, and at -V'O feet the velocitj ' of the sound has risen to normal. |