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Article
December 1951

MODIFIED TUNING-FORK TEST THAT CAN BE SUBSTITUTED FOR AUDIOMETER

Author Affiliations

TOKYO, JAPAN

AMA Arch Otolaryngol. 1951;54(6):693-698. doi:10.1001/archotol.1951.03750120086011
Abstract

I STRONGLY feel that the exact determination of the hearing function should be the otologist's concern and have found that the principle of the percentage scale of hearing in the tuning-fork test hitherto used was illogical from the standpoint of acoustics. Through my experiment I arrived at the conclusion that the usual tuning-fork test should be abandoned for a modified one to which the principle of time difference was applied. What I term the principle of time difference is found by multiplying the damping constant of a tuning fork by the time difference between the hearing period of a deaf person and that of a normal person for the same tuning fork. This matter has already been described by Harvey Fletcher1 in his book, "Speech and Hearing."

From this principle I have derived a convenient method of measuring the damping constant of a tuning fork, as well as an

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