14 



Number of ships furnishing water temperature reports ^ 159 



Number of ships furnished special ice information : 6 



Figure 7 shows track of patrol vessel, surface isotherms, and ice 

 conditions for this cruise. 



SIXTH CRUISE, "PONTCHARTRAIN" JUNE 23-29, 1934. 



The Pontchartrain sailed from Halifax at 6:30 a. m. June 22, 1934, 

 for the Grand Banks. The Mendota was met in 42°50' N., o2°56' W., 

 at 4:15 p. m., June 23. Lt. R. M. Hoyle and ice observation party- 

 reported aboard and the Pontchartrain relieved the Mendota as ice- 

 patrol vessel. 



The Pontchartrain then stood to a point 55 miles east of the tail 

 of the banks. The following morning we scouted to the northward 

 east of an area scouted by the Mendota on June 22. At the last- 

 known position of the southernmost berg the course was changed to 

 65°. At 4:25 p. m. dense fog set in. The fog lifted at 7:05 p. m. 

 and scouting was continued. The berg was located in 44°32' N., 

 47°11' W., sea-water temperature 47° F. This berg had drifted at 

 the rate of 0.5 mile per hour, 60° true, since the ice patrol had sighted 

 it on June 22. It was estimated that it had lost approximately 25 

 percent of its mass during this time. During the following night the 

 Pontchartrain stood to the northward to 46°04' N., 47°40' W. At 

 daylight June 25, with full visibility we scouted on course 199° at 

 16 knots. In latitude 44°18' N., we ran on course 289° for 24 miles 

 and then scouted on course 19° to latitude 46°. A large growler was 

 sighted in 46°00' N., 47°50' W. 



On June 26 no scouting could be done until 3:05 p. m. on account 

 of dense fog. Then the ice-patrol vessel stood to the northward in 

 longitude 47°50' W., to latitude 46°40' N., and changed course to 

 90°. Fog set in at 5:38 p. m. and prevented further scouting for that 

 day. On the day following, with good visibility the Pontchartrain 

 scouted to the southward from 46°50' N., 47°17' W., to latitude 

 45°55' N., at 16 knots. We then headed for the position of a berg 

 reported that day in 44°52' N., 46°50' W. This berg was located in 

 44°58' N., 46°39' W., sea-water temperature 49°F. It proved to be 

 the same berg sighted hy the ice-patrol vessel on June 24. It had 

 decreased in size materially since we had last seen it. From this berg 

 the Pontchartrain scouted on course 180° for 24 miles and tlien 

 changed course to 90°. At 3:30 p. m. the course was changed to 

 180° in longitude 46°11' W. At dark, latitude 43°13' N., had been 

 reached. During the night the Pontchortain lieaded for the position 

 of a berg reported in 43°58' N., 48°00' W. At daylight this berg 

 was found in 44°04' N., 47°57' W., sea-water temperature 49°F. It 

 was a very small twin-peaked berg, with the seas breaking over the 

 center. 



