QUALITATIVE DESCRIPTION OF BOTTOM REVERBERATION 



311 



BEAM DOWN 30 DEGREES 

 PROJECTOR DEPTH ■ 10 FT 



-SO 



-60 



-70 



■80 



-90 

 -50 



-60 



-70 



UJ -80 

 m 



O 



UJ 



° -90 



z 



i -'00 



-■ -60 



z 

 o 



BEAM UP 30 DEGREES 

 PROJECTOR DEPTH 'as FT 



a: 



q: 



> 

 ui 



-70 



-80 



-90 



-100 



-no 



-70 



-80 



-100 



32 



64 



64 



96 128 O 32 



RANGE IN YARDS 

 FlGTTBE 5. Observed reverberation level with beam inclined 30 degrees. 



96 



