turns out to have been in agreement with modern determinations.

The report also comments on the large differences apparent in the low-frequency region, which remain unexplained. Possible explanations are:
* The equipment used was not properly calibrated.
* The criteria used for judging equal loudness at different frequencies had differed.
* Subjects were not properly rested for days in advance, or were exposed to loud noise in traveling to the tests, which tensed the tensor tympani and