7 18 19 20 



FIGURE 20 OSCILLATIONS OF THE THERMOGLINE AT WEATHER SHIP DELTA, 44°N., 4I''W., AUGUST 1950. 



The analysis of the Coast and Geodetic Survey, however, proved 

 negative. It was their opinion that there were deficiencies in 

 the data, since, with the number of dally observations varying 

 from only one to six, one cannot be sure that the peaks and 

 troughs of the waves are clearly defined. There is no doubt 

 also that the effect of the depth and the vertical density 

 gradient upon the change in phase and aiTiplitude of the wave 

 with depth was also a major contributing factor to the failure 

 of such an attempt. Illustrations of the type of data which 

 were analjrzed in this manner are given in figures 20 and 21. 

 The irregularities in the amplitudes would lead one to believe 

 that the point of the Coast and Geodetic Survey is well taken. 

 For a complete statistical analysis, observations should be 

 taken at much more frequent Inter-vals, in order that the curve 

 more closely approAim.ate a continuous trace and all the ridges 

 and troughs be delineated. 



d. Short p erio d intern a l vjaves - In addition to the above 



44 



