1-2 2-4 



SLIGHTLY . MEDIUM 



INSENSITIVE I SENSITIVE 



4-8 VERY SENSITIVE 



4 5 



SENSITIVITY 



FIGURE 14. RELATION OF POROSITY TO SENSITIVITY. THE EYE-FITTED DASHED LINE 



REPRESENTS A SUGGESTED CORRELATION BETWEEN THE TWO LINES 



DENOTING GENERALIZED LIMITS 



42 



