11 



erly gale having sprung up, the Tampa hove to on a westerly course. 

 The following morning was foggy. At 3 p. m. the fog cleared and the 

 Tampa searched for the southernmost berg until dark. 



May 17 was spent cruising to the westward in fog to meet the 

 Pontcharfrain. Contact was made in latitude 42° 58' N., longitude 

 52° 39' W., at 10 a. m. May 18, and the ice observation party was 

 transferred to the Pontchartrain. The Tampa then proceeded to 

 Halifax, Nova Scotia. 



A general fog prevailed over the entire ice region for several days 

 at the beginning of the present cruise. Not until May 9 did enough 

 vessels pass along the Canadian tracks "E" between longitude 49° 00' 

 and 4G° 00', with sufficient visibility to make a comprehensive survey 

 of the ice conditions in this area. On that date three vessels passed 

 through this area in daylight hours and two at night. These vessels 

 reported 13 bergs. This shows a remarkable decrease in the number 

 of bergs along the Canadian tracks since April 30. 



During the cruise two bergs drifted south of the tail of the Banks. 

 These bergs occupied the entire time of the ice-patrol vessel after 

 May 8, and limited the area that could be scouted to that south of 

 43° 20' N. and west of 49° 00' W. The drift of the southernmost 

 berg was closel}^ watched until May 12. This berg was first reported 

 on May 3 in 43° 08' N., 49° 09' W. It w^as reported again May 7, 

 having drifted 41 miles 229° true. On May 8, when located by the 

 ice-patrol vessel, it had drifted 19 miles 220° true. On May 9, 10, and 

 11 it made a small circle and May 12 it drifted 9 miles 214° true. Fog 

 prevented the sighting of this berg again during the patrol. 



During the patrol six vessels passed along the "F" track to Cape 

 Race. These vessels reported only 15 bergs. 



The weather, except for five days in the middle of the patrol, was 

 rather boisterous and foggy. The wind attained the force of a moder- 

 ate gale at four different times during the patrol. The visibility was 

 less than 2 miles 39.5 per cent of the time. 



The following is a summary of the ice and the water temperature 

 reports received during the resent patrol: 



Number of different bergs south of latitude 48 36 



Number of ice reports received 76 



Number of ships furnishing ice reports 35 



Number of ships furnishing temperature reports 149 



Number of water temperature reports received 1, 190 



Number of different bergs south of latitude 43 2 



Number of vessels furnished special ice information 13 



Number of vessels reported for violation of track agreement 3 



Figure 3 shows the ice conditions and surface isotherms that existed 

 during: the third cruise. 



