ADMINISTRATIVE INFORMATION 



Work was accomplished under SF 101 03 18, Task 

 8049 (NEL L30151). The report covers work from October 

 1964 to March 196 5 and was approved for publication 26 



July 1965. 



CONTENTS 



INTRODUCTION... v^ge 5 



MECHANICAL DESIGN. . . 5 



ACOUSTICAL DESIGN. . . 8 



EVALUATION OF THE VESSEL. , . ^ 

 Capsule Walls Uniform. . . 9 

 Directivity Unaffected by Pressure. . . 9 

 Attenuation Uniform to 100 kc/s. . . ^ 

 Beam Patterns Unaffected by Vessel. . .11 



PRESSURE VESSEL SPECIFICATIONS. . . 13 



TESTS OF THE B24FA TRANSDUCER. . .14 



CONCLUSIONS... ly 



