PCREWCED 



Many phases of naval operations involve the application of 

 oceanographic principles. In order to predict changes in oceano- 

 graphic parameters, it is necessary to understand the nature of 

 the physical processes that are producing the changes. Accurate 

 methods of predicting changes which occur in the thermal structure 

 of the ocean cannot be obtained without consideration of internal 

 waves . 



This report presents the results of research concerning the 

 existence and periods of internal waves in an area northeast of 

 Bermuda* Activities receiving this publication are requested to 

 forward their comments to the Hydrographic Office. 



J. B. COCHRAN 

 Captain, U. S. Navy 

 Hydrographer 



