cruise began with the departure of the Evergreen from Port 

 Union, Newfoundland, on the afternoon of 13 July. The oceano- 

 graphic work included the occupation of three sections disposed 

 in the form of a triangle with corners at approximately 50° 00' N., 

 49°00' W.; 48°44' N., 52°58' W. ; and 47°24' N., 50°00' W. The 

 occupation of the triangle was followed by a repetition of the 

 section across the Labrador Sea from South Wolf Island, Labrador, 

 to Cape Farewell, Greenland. The work of collection of data on 

 the post-season cruise began on the morning of 14 July at station 

 4560, located at 50°01.5' N., 48°58' W. The triangle was com- 

 pleted without incident at station 4589, located at 49°59.5' N., 

 48°58' W., on the morning of 17 July. The section across the 

 Labrador Sea was begun at station 4590, located at 53°42.5' N., 

 55°46' W., on the evening of 18 July. Work progressed northeast- 

 ward along the section without incident as far as station 4603, 

 located at 56°36.5' N., 50°30' W., which was occupied on the eve- 

 ning of 20 July. From this station on winds from the easterly 

 quadrants continued to freshen. Although progress was slow, 

 work at stations continued until 2230 on 22 July when, after com- 

 pleting station 4610, located at 59°25' N., 44°49' W., the ship was 

 hove to to await daylight. Progress was resumed at 0250 on 

 23 July and the work of collection of data was completed at sta- 

 tion 4613, located at 59°43.5' N., 43°58' W., at 0818 on 23 July. • 



On the evening of 23 July a carboy of water for eventual use 

 as a substandard of salinity was collected at 58°58' N., 45°23' W. 

 After various diversions the Evergreen arrived at Woods Hole on 

 the afternoon of 1 August to discharge oceanographic equipment 

 and personnel and conclude the oceanographic field work for 1951. 



The oceanographic work was under the supervision of Oceano- 

 grapher Floyd M. Soule who was assisted by Lt. Peter S. Branson 

 and Lt. (jg) Robertson P. Dinsmore. 



In all, 307 stations were occupied during the season and post- 

 season cruises. The 24 stations comprising the section across the 

 Labrador Sea were occupied from the surface to as near bottom as 

 was practicable. At the remaining 283 stations the observations 

 extended to a depth of about 1,500 meters where the depth of water 

 permitted. As in previous years the intended depths of observa- 

 tion, in meters, were 0, 25, 50, 75, 100, 150, 200, 300, 400, 600, 800, 

 1,000 and thence by 500-meter intervals. The dynamic topography 

 has been referred to the 1,500-decibar surface for the section 

 across the Labrador Sea. For all other stations, the dynamic 

 heights have been referred to the 1,000-decibar surface. 



Temperatures were measured with deep sea reversing thermom- 

 eters, most of them of Richter and Wiese manufacture. Some of 

 the protected thermometers were manufactured by Negretti and 



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