37 



3. A total of 57 stations were occupied during this survey. Requisite 

 courses were then steered for St. John's with arrival there on May 4. 



On May 16 the General Greene departed from St. John's to make a 

 third current survey of the region immediately eastward of the Grand 

 Banks. It was planned that during this survey a given area would be 

 mapped once and then resurveyed as quickly as possible in order to 

 learn something of the manner in which the current pattern changes 

 from one survey to the next and also to improve our knowledge of the 

 magnitude of the changes which take place in a period of time com- 

 mensurate with that required in making the survey. 



The work of coHection of data was begun at station 3188 on May 

 17 and progressed from north to south. Beginning on May 21, as 

 the southeastern corner of the survey was approached, and continuing 

 for about 48 hours, westerly winds of force 7 or greater were experi- 

 enced. Although these conditions were most unfavorable for the 

 occupation of oceanographic stations they made the repeat survey 

 doubly valuable since one of the questions of much practical import- 

 ance is to what extent such a disturbance affects current patterns and 

 velocities. The first half of the survey was completed at station 3228 

 on May 23. The work of repeating the survey began the following 

 day at station 3229 and progressed without major incident to the 

 final station, number 3268 which was completed on May 29. 



The two resulting current maps, one superimposed on the other, 

 were then constructed and delivered aboard the cutter Chelan on 

 May 30. After a conference with the Commander, International Ice 

 Patrol Force, and the Ice Observation Officer, the General Greene 

 laid a course for St. John's where she arrived on May 30. 



The General Greene left St. John's on June 11 to make a fourth cur- 

 rent survey of the Grand Banks area. In accordance with plans 

 made in conference with the Commander, International Ice Patrol 

 Force, this survey was to cover the same area mapped during the 

 double survey of May 17 to 29. Accordingly the work of collection 

 of data began at station 3269 on June 12, and, progressing from north 

 to south, was completed at station 3308 on June 18, a total of 40 sta- 

 tions having been occupied during this survey. Some delay was experi- 

 enced on June 16 at station 3298. At this station the oceanographic 

 wire cable was cut and spliced to eliminate some serious kinks which 

 were introduced at about 1,140 meters from the end of the wire when 

 it jumped an idler-sheave during a surge of the vessel. No other 

 notable interruptions to the program occurred and after completing 

 the survey the General Greene returned to St. John's where she arrived 

 on June 19. 



As related in the foregoing, 235 oceanographic stations were occupied 

 during the ice-patrol season. After completing the fourth survey of 

 the Grand Banks region, the General Greene made a short post-season 



