The need for excluding distracting and masking noises to insure accuracy in making hearing tests has been appreciated and emphasized only in recent years. In the presence of noises which ordinarily prevail in downtown office buildings or schools it is impossible to detect or measure slight but significant degrees of loss of hearing. Their early detection according to modern otologic practice is of great importance, especially in the field of the prevention and amelioration of deafness.
It is impossible to construct rooms absolutely soundproof against disturbing noises of unlimited intensity, and even to obtain total isolation from noises of moderate intensity requires massive construction and a large expenditure. For accurate clinical work it is necessary, nevertheless, to reduce the prevailing noise to a practical minimum. This as a rule is not accomplished by the carpenter or contractor not experienced in acoustic construction.
To meet the necessity for a hearing chamber
HORACE NEWHART, HENRY E. HARTIG. AN EFFICIENT AND PRACTICAL BOOTH FOR TESTING HEARING. Arch Otolaryngol. 1938;28(6):1000–1002. doi:10.1001/archotol.1938.00650041013011