XXVIII.The acoustical insulation afforded by double partitions constructed from similar components

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Abstract
A theoretical and experimental study has been made of the acoustical insulation afforded against air-borne sound by double partitions constructed from similar components. In the case of singly resonant rigid partitions a relation is derived connecting the sound reduction due to a double partition with that due to one of its components. It is shown that the relation represents with reasonable accuracy the results for a rectangular double glass partition studied experimentally. It is deduced and confirmed experimentally that at the lower frequencies an increase of the spacing between two air-separated components may decrease the acoustical insulation. It thus happens with double glass windows, and may occur with other double structures, that there is a range of frequencies over which the acoustical insulation is less than that afforded by one of the components.

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