115 



COMPENSATOR AT 90* 

 / IWOTATINC HYDWOPHOWE 



SO* 



120* 



ttO* 



180* 



150* 



Fig. 2A. 10-foot Line Hydrophone 

 with Compensator at 8 kc. 



Fig. 2B. 10-foot Line Hydrophone 

 with Compensator at 8 kc. 



300* 



UNE HVOMOPHONE AT (O* 



I MTATIWC COMPOISATOW 



330* 0* 30* 



o*cd 

 2fi_J 



Fig. 2C. 10-foot Line Hydrophone 

 with Compensator at 8 kc. 



Fig. 2D. 10-foot Line Hydrophone 

 with Compensator at 8 kc. 



Directivity patterns for this array are shown in figures 2 and 3. The 

 pattern of figure 2a was taken, with the compensator set at 90° (no delay), by 

 rotating the line array about an axis passing through the center of the array and 

 perpendicular to the line of the array. Figure 2b was obtained by holding the 

 line array fixed and perpendicular to the direction of the signal source. Figures 

 2c and 2d are compensator patterns taken with the line of the array making an 

 angle of 30° and 60° respectively with the direction of the signal source. The 

 patterns of figure 2 were taken at 8 kc with the source approximately 60 feet 

 from the array. 



The patterns of figure 3 were taken at 2.5 kc. For each of these pat- 

 terns, the compensator was set at a particular angle and the pattern obtained by 



