Number of ships fvirnishing water temperature reports 180 



Number of ships furnished special ice information 13 



Figure 5 shows ice conditions and surface isotherms for this cruise. 

 FOURTH CRUISE, "PONTCHARTRAIN", MAY 26-JUNE 9, 1934 



The Pontchartrain sailed from Hahfax at 7:38 a. m., May 25, 1934. 

 The Mendota was met in 42°31' N., 52°15' W.,at 10:40 p.m., May 26. 

 Lt. R. M. Hoyle and ice-observation party reported aboard and the 

 Pontchartrain reHeved the Mendota as ice-patrol vessel. Then the 

 Pontchartrain headed for the berg that the Alendota had sighted in 

 42°33' N., 50°25' W. At daylight the following day the ice-patrol 

 vessel located this berg in 42°28' N., 50°28' W. We stopped and 

 drifted near this berg to ascertain its set and drift. It was dis- 

 integrating rapidly under the influence of 49° water. At 6 a. m. 

 May 28 the berg had drifted 8 miles south into 52° water. At this 

 time the berg turned over and broke into three large growlers. At 

 3 p. m. the visibility which had been too low for scouting increased to 

 10 miles. At 3:30 p. m. the ice-patrol vessel left the growlers in 

 42°20' N., 50°23' W., and scouted to the northward. At this time 

 the largest growler was about twice the size of a ship's boat. At 

 5:15 p. m. dense fog set in and the ice-patrol vessel stopped and 

 drifted. 



The fog lifted at 11:30 a. m. the following morning. The Pont- 

 chartrain scouted up the eastern edge of the Grand Banks at 15 knots. 

 At 4:30 p. m. a berg was located in 43°27' N., 49°15' W., sea water 

 56°. This was a twin-peaked berg about 50 feet liigh and 275 feet 

 long. The search was continued to the north-northeastward until 

 dark. Six small bergs were located within 10 miles of 44°00' N., 

 49°00' W. These bergs were in 41° water. 



On May 30 the ice-patrol vessel ran east in latitude 44°15' N. to 

 longitude 48°00' W. Three of the bergs sighted the afternoon before 

 were relocated. Their positions had not appreciably changed. A 

 berg was found in 44°11' N., 48°02' W. From this berg we scouted 

 to the south-southwest until 12:30 p. m. when dense fog set in. We 

 then headed for shoal water and anchored in 43°40' N., 49°47' W. 

 On May 31 we shifted anchorage to 44°09' N.,49°33' W.,in dense fog. 

 At 1 p. m., June 1, the visibility improved to 12 miles. The ice-patrol 

 vessel stood to the eastward to deep water and scouted down the 

 eastern edge of the Grand Banks to latitude 43° 10' N. and stood 

 eastward until dark. Bergs were sighted in 44°08' N., 49°02' W.; 

 44°09' N., 48°44' W.; 43°50' N., 48°56' W. As we did not sight any 

 ice to the south of these bergs the southernmost berg of this group is 

 beheved to be the same one sighted on May 29 in 43°27' N., 49°15' W. 



On June 2 we scouted to the north-northeastward east of the area 

 covered the afternoon before. At 9:15 a. m. we located two bergs in 



