Gallagher 



Table 2 



MEASURED AND SUTTON DERIVED SOUND VELOCITIES AND CORRESPONDING 

 ACOUSTIC IMPEDANCE DATA — CORE NO. 2 — HAP 



core no. 2 are shown in Fig. 4. The bottom loss values appear to be greater 

 in core no. 2 for the two cases than for those In core no. 1. Although it is 

 tempting to attribute the lower losses | 

 in core no. 1 to the higher sound ve- 

 locities reported, it appears that the 

 magnitude of the sound velocity value 

 has little influence on the value of 

 the reflection coefficients for any 

 given angle. 



For cores 1 and 2 the lower Sutton 

 derived sound velocity data appear 

 to produce generally higher reflec- 

 tion coefficients. However, this is not 



10 20 30 40 50 60 70 80 



ANGLE Of INCIDENCE (DEGREESI 



Fig. 4 



Reflecfion Coefficients versus Incident 



Angles- Core No. 2 — HAP 



94 



