Abstract
In any measurement of hearing sensation, there are three characteristics of incoming sound waves to be considered, namely : intensity, frequency and quality. The intensity, as far as hearing is concerned, is measured in terms of threshold of (or simply threshold), which is minimum intensity of sound producing a sensation of hearing. It is measured by tuning fork, audiometer, acoumeter, Galton whistle, speech, watch, etc. The last two methods tell something as to quality of sound one hears. However, quality of sound is not to be considered in this paper. In order that ear's faculty of recognizing different frequencies may be measured, there must be presented to ear two or more tones of different frequencies. The faculty by which similarity or dissimilarity of these two tones is recognized is called the comparing or differentiating faculty of
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