2/8 4/8 6/8 I 



D (IN.) 

 4/8 



Figure 11. Calibration tests for mode 

 2 - 1 - 1, showing attenuation coefficient 

 vs. D, using pure water at 18° C (no 

 correction for attenuation by the water). 



0., oi .DB/KYD 



MODE 2-1-1 

 TEMP. I8°C 



Figure 12. Calibration tests for mode 

 2-1-1, showing attenuation coefficients 

 of figure 11 plotted vs. resonant fre- 

 quency/ . Temperature 18°C. 



68 



