A VOICE AND EAR 317 



much closer when all circumstances are considered, e.g., the frequency 

 range to be covered and the importance of incurring no risks whatever. 

 The region inward beyond this bend is apparently one of rather 

 uniform pressure, usually higher than in the outward positions of 

 the canal, so that there is little chance of a measurement being made 

 at the pressure node of a distinct standing wave pattern. This 

 probably is accounted for by the irregularity of the passage and the 

 character of the canal walls. 



Receiver Calibration 



At each frequency, response measurements were made on eight 

 ears as described, and the average computed. The results are shown 

 in Fig. 15. 



When the response-frequency characteristic of one receiver has been 

 determined by the method described, any other receiver may be 

 calibrated by a direct comparison. The response-frequency charac- 

 teristic on the ear shown in Fig. 16 was obtained in this manner. 



