Abstract
DURING the last two years, progress has been made in the problem of noise reduction, especially in sound-proofing rooms against the transmission of external noise. In Engineering of October 25 the allied problem is described of sound-proofing rooms by using Accousti-Celotex tiles of sugar-cane fibre, manufactured by Messrs. Celotex, Ltd., Stonebridge Park, London, N.W.10. Under present-day conditions, many offices, etc., are more congested, with resultant increased noise. It is of interest, therefore, to cite certain data on sound absorption in offices which have recently become available. They are derived from tests made in the offices of an insurance company in the United States. This company has had about 300,000 square feet of Accousti-Celotex tiling fitted to its offices. Records were kept for a year preceding the fitting of the tiles and for a year after they had been installed. In two selected rooms, the increase of efficiency of the persons working therein was respectively 9·2 per cent and 7·7 per cent. Typists' errors were reduced by 29 per cent, and calculating machine operators' by 52 per cent.
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Reducing Noise in Enclosed Spaces. Nature 146, 714 (1940). https://doi.org/10.1038/146714a0
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DOI: https://doi.org/10.1038/146714a0