6 



winds from tlie south and southwest brought a 4-day period of 

 fog. North winds on May 9 dissipated the fog. At the close of 

 the cruise south winds were causing a general fog over the ice-patrol 

 area. The percentage of time with visibility less than 2 miles was 

 35.7; less than 4 miles, 39.3. 



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

 reports received during the cruise: 



Estimated number of bergs reported south of 48° N 170 



Estimated number of bergs reported south of 45° N .._ 11 



Number of vessels furnishing ice reports 76 



Number of vessels furnishing water-temperature reports 193 



N umV:»er of vessels furnished siiecial ice information 6 



N umber of ice reports received 441 



Number of water-temperature reports received 897 



Figure 4 shows ice conditions and surface isotherms for this cruise. 

 THIRD CRUISE, "MENDOTA", MAY 13 TO 26. 1934 



The Mendota sailed from Halifax at 5 a. m. May 11. The 

 Pontchartrain was met in latitude 42-30 N., longitude 52-45 W. 

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

 the Mendota relieved the Pontchartrain as ice-patrol vessel at 6:10 

 a. m. May 13. The Mendota then proceeded to a point 15 miles 

 south of the tail of the Grand Banks. From this point we scouted 

 to the northeastward for 25 miles, when fog set in. 



No scouting for ice could be done on the following day on account 

 of fog. On May 15 the fog cleared in the afternoon and the ice- 

 patrol vessel searched the area between the 100- and 1,000-fathom 

 curves from the tail of the Grand Banks in the cold water. The 

 berg sighted on May 11 by the Pontchartrain in 44°01' N., 49°01' 

 W., was found in 75 fathoms with water temperature 35° F. in 

 43°58' N., 49°07' W. Its appearance had not changed appreciably. 

 Another berg was found in 44°42' N., 48°47' W. This berg was 

 approximately 700 feet long, 400 feet wide, and 70 feet high and 

 was a sohd block of ice with a flat top. A small pyramid-shaped 

 berg was found in 44°47' N., 48°35' W. At 3 p. m, fog shut in 

 and no further scouting could be done. 



At noon the following day the fog Hfted. From 45°00' N., 47°30' 

 W., the Mendota ran west for 30 miles and then changed course to 

 199° to locate the bergs sighted the previous day. The northern- 

 most berg of the group was found in 44°25' N., 48°22' W., at 4 

 p. m. This berg had drifted 24 miles, 155° true in 25 hours. The 

 second berg of the three was found in 44°14' N., 48°41' W., at 6 

 p. m. This berg had drifted 28 miles, 172° true in 29 hours. The 

 southernmost berg was found in 43°45' N., 49°05' W., at 8 p. m. 

 Its drift was 13 miles, 172° true, in 34 hours. During the night 

 the Mendota lay to near this berg. At 10:20 p. m. we gave ice 



