Abstract
The work reported in this paper was carried out some years ago during the development of Morse's theory of reverberation, in an attempt to explain the difference in the observed values of absorption coefficients for sound waves which are normally incident on an absorbing surface in a room and those which are at grazing incidence. The theory has been developed further by works of Morse, Bolt, Ingard, Beranek and others. The work has thus some historical value; nevertheless, the results obtained are of practical value in case of cubical rooms with absorbing material concentrated on one wall-ceiling-and special placements of the microphone, as is the case with many broadcasting studios.
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