— 



5 — 



0735 



0740 





0745 



50 FEET 



LEGEND 



LOCATION A 

 — LOCATION B 



LOCATION C 



10 



70 FEET 



\- A 



* /-400d 



10 



5 — 



95 FEET 



0735 



0740 

 HOUR (GMT) 



0745 



FIGURE 9 SAMPLE OF WELL-DEFINED TEMPERATURE VARIATIONS 

 ABOVE AND BELOW A LEVEL OF LITTLE VARIATION — 

 20 MAY I960 



21 



