The bathythermograms collected from the USS CACOPAN 

 prove quite convincingly that internal waves exist in the 

 antarctic region. Long-period waves attained a height of as 

 much as 40 feet in a period of 90 minutes. Many short- 

 period waves of about 10, Z0, and 30 minutes and with a height 

 of about 10 feet were found to be superimposed on the longer 

 waves . 



FIGURE 19. Internal waves — vertical fluctuations in the depth 

 of the 30-degree isotherm; data from repeated bathythermo- 

 graph observations on 28 and 29 January 1947 at two locations. 



68°16"S. 174 53' W. 



67' 47' S. 67° 40'S. 

 176'54'Wto 176' 10' W. 



