ABSTRACT 



The velocity of sovind has been measured in 

 natural sea water samples at megacycle fre- 

 quencies by means of modern interferometric 

 techniques. From these measurements, an 

 empirical equation has been formulated, and new 

 tables and graphs of the velocity of sovind in 

 natural sea water at "zero" depth are presented 

 on the basis of this eqviation. 



The validity of utilizing these velocity tables 

 at sonar frequencies is based on theoretical work 

 which indicates the error introduced by so doing 

 is at least an order of magnitude smaller than 

 the claimed accuracy. The accuracy of these 

 tables is estimated to be within +0.2 meter per 

 second. The velocity values range approximately 

 2-4 meters per second higher than those in 

 existing tables. 



PROBLEM STATUS 



This is an interim report; work on the gen- 

 eral project is continuing. 



AUTHORIZATION 



NRL Problem S02-04 

 RDB Project NR 522-040 



Manuscript submitted May 15, 1952 



