19.5 20 205 



I I 40 



35 CM./SEC. 

 352° TRUE 



I G E K 



32 CM/SEC. 

 337° TRUE 



NOON POSITION 

 22''00' N. 

 IIO-K' W. 



TRACK REVERSAL 



I KM 



4 30 



Figure 31. — Track of thermograph survey of front 1 (0750-1430 hours 7 May 1960), with surface isotherms 

 superimposed. Results of four GEK observations also are shown. The track after course reversal (0935) has 

 been displaced for clarity but closely corresponds to the track between 0928 and 0935 hours. 



43 



