Two years ago the University of California's Dr. Vern O. Knudsen, president of the Acoustical Society of America, communicated to the Society's Journal some studies which indicated that sound is absorbed in air ten to 25 times more rapidly than had been previously calcu lated, and that absorption is fastest in dry air, a familiar fact to those who know how well sound carries on a foggy day. Since then Dr. Knudsen has not ceased to experiment with the "decay" of sound under various conditions. To the same Journal he has now reported new...
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