J = Distance between contours at turning points,* 



R = Distance along orttfogonal 



T = 12 seconds 



Lo= 737 ft. 



For contour interval from 40fm to 30 fm C /C = 1.045, 0/0=0.957 



12 2 1 



Acc = 20-25 



Figure 2-21. Refraction Diagram Using R/J Method 



2-74 



