returned to the triangle and resumed work on the third side shortly 

 before noon on 15 July. 



One additional oceanographic station had been completed when it 

 was necessary to interrupt the oceanographic work to search for a 

 berg or bergs which had been reported between 46° N., and 47° N., 

 and between 47° W., and 48° W. A berg was located the following 

 morning. A box search around the berg, combined with an ah" search 

 conducted by a PBY-5A from the Coast Guard Air Detachment at 

 Argentia indicated that only one berg was in the immediate vicinity. 

 The Evergreen continued to stand by the berg until 23 July. By then 

 it had decreased in size to a growler small enough so that it was no 

 longer a hazard to navigation. Advantage was taken of the period 

 during which the Evergreen^s movements were restricted to the vicinity 

 of the berg to run a series of current measurements with the von Arx 

 current meter once an hour for 25 consecutive hours as an experiment 

 looking toward the possibility of determining tidal surface currents in 

 the open sea with this instrument. 



The Evergreen proceeded to Argentia to refuel, arriving there on the 

 night of 24 July and departing on the morning of 27 July to resume 

 oceanographic work. Because of the considerable time interval since 

 the work was interrupted on 15 July the work done prioi- to that time 

 could not be considered synoptically witli observations made nearly 2 

 weeks later. The compromise decided upon was to begin work at the 

 southern corner and run the soutluvastern side and rerun the northern 

 side. This work began on the morning of 28 July at station 4263 and 

 was completed on the afternoon of 30 July at station 4282. 



The first station of the section across the Labrador Sea was reached 

 off South Wolf Island on the afternoon of 31 July. Work on the sec- 

 tion progressed without interruption until the evening of 2 August 

 when, in the vicinity of station 4297, wind, sea, and current conditions 

 made it prudent to heave to to await more favorable conditions. By 

 morning of 3 August, wind and sea were both from the north- 

 northwest and had decreased to force 6 and 5 respectively and work 

 at the oceanographic stations was resumed. The work of collection 

 of data was completed on the morning of 5 August at station 4306, 

 located at 59°42' N., 44°15' W., and the Evergreen proceeded to Woods 

 Hole, Mass., by way of Cape Race. A carboy of sea water for use 

 as a substandard of salinity was collected on the afternoon of 5 August. 



Except for a brief diversion toward Halifax on the afternoon of 

 9 August, when a plane in the vicinity was having engine trouble, 

 progress was not fui-ther interrupted and Woods Hole was i-eached on 

 the morning of 1 1 August to complete the postseason cruise. 



At the 24 stations comprising the section across the Labrador Sea, 

 the observations extended from the surface to as near bottom as was 

 practicable and the dynamic topography was referred to the 1,500- 

 decibar surface. At the other 283 stations occupied during the season 



64 



