NAVAL UNDERSEA WARFARE CENTER 



An activity of the Naval Material Command 



G. H. Lowe, Capt, USN 



Commander 



Wm. B. McLean, Ph.D. 



Technical Director 



The work described in this report was performed 

 under SF 101 03 15, Task 8119 (NEL L20471) by members 

 of the Listening Division. The report covers work from 

 January 19 65 to July 1966 and was approved for publication 

 22 December 1967. 



The authors are indebted to R. Cruse for the design 

 of the pressure measuring system; to H. Carmichael for 

 much of its construction; to J. Leonard for the design and 

 construction of the calibrate boxes; and to G. Beilke 

 for his suggestions =>«J ~~- " stance in field tests. 



Under authority of 



Curtis R. Haupt, Head 



Sensor Development Dept. 



, San Diego, California. 



