Abstract
Audibility thresholds are obtained for the fundamental tone to be used and for the 2nd harmonic. The fundamental frequency is then set on one pure-tone oscillator so that it will be 70 db above the audibility threshold for that tone. On a 2nd oscillator, the exploring-tone frequency is made to differ from the frequency of the 2nd harmonic by 4 cps and adjusted to 60 db above threshold. The tones are then mixed and switched to the subject''s ear, and attenuating until beats are no longer heard. Inner ear pathology is demonstrated by abnormally restricted range.

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