NUMERICAL COXST.liWTS Ol- Sl'l-ECIl .1X1) Ilf-.IRIXG 381 



XI. DVWMK AI, ("oNslAMS ()!• Till-: UKARINd MK(HAMSM 



aiowill, W, II., A IVMhook of Physiolony" 

 (Wrights<in, Sir Thomas, ".\iial\ liial Mechanism of the Internal Kar" ) 



(a) Kar (".ma! • " 



Length. 2.l-2.t» cm. 

 X'olume, 1 cm'. 

 Area at Openini;. .'M to .")() cm-. 



LOG.„W 



WEIGHT FACTORS FOR DIFFERENT 



FREQUENCIES AT VARIOUS 



SENSATION LEVELS 



1,000 e.ooo 3,000 4,000 5,000 



FREQUENCY 



20 



40 GO 



SENSATION LEVEL 



Fig. 5 



100 



{h) Drum 



Vertical Diameter, .85 cm. 

 Horizontal Diameter, 1.00 cm. 

 Area, .65 cm-. 



