visibility prevailed throughout the dayo This condition v/as expected to con- 

 tinue into the 21st with increasing ceiling and visibility but -wdth slowly de- 

 creasing wave height. At i300Z on the 21st, the R= V. ATLANTIS reported 

 nine feet with gradual decrease in height becoming a reported seven feet 

 at 1700Z. It was decided to take the stereo photographs on the morning of 

 the 21st with the expected improved ceiling and visibilityj, and while the 

 wave heights would still be acceptable, although not the originally desired 

 12 feet. The photographic planes took off, b\it one of the planes developed 

 mechanical difficulties and -was forced to return„ No further opportunity 

 was available to take advantage of this ■wave situation. 



The second situation was expected to develop during the 23rd of Octo- 

 ber and carry into the 24th, but it was not expected to be quite of the in- 

 tensity experienced on the 20th. Wave heights of 8.5 feet were reported 

 by the R, V. ATLANTIS on the 23rd and 24th,' the planes, however, were not 

 available until the 25th. It was eJqjected that the acceptable wave conditions 

 would degenerate sometime during the 25th<, On the 24th it appears that 

 waves at least 7 feet in height w^ould prevail during the night and early morn- 

 ing of the 25ths, with gradual decrease during the morning. There was, how- 

 ever a good possibility that waves of at least seven feet significant height 

 would continue into the early afternoon. On the basis of this possibility, it 

 was planned that the stereo-photography be accomplished on the 25th, For- 

 tunately acceptable wave heights continued into the early afternoon, and died 

 down thereafter^ Wave heights of seven to nine feet were reported by the 



R. V. ATLANTIS during the time the photography was accomplished, 



39 



