57 



The Modoc, on the 15th, searched around the Tail of the Bank to 

 make sure no bergs had entered this area unobserved. AprU 16 the 

 scouting was extended northward along the east side of the Bank 

 and we sighted a large berg and growler near nightfall. The berg 

 was surrounded by warm water, temperature 50° F., but inshore to 

 the westward from its position we could plainly see the boundary 

 line where the cold slope water began. The surface temperature for 

 April 9 to 24 (fig. 54, p. 95) shows the relative positions of these two 



55 



f 



50 



I 



M 



^.|m' 



../" 







•%? 



x-< 



^"^7 



° ,<> 9 



c^.o ;<? 9 





^'^"i-1 



.•-.-.e>,A s?^ 



49 



45 



44 



4i 



41 



55 S4 5b 5Z 5\ 5o 49 -'fe 47 4fa 45 44 41, 



Fig. 23.— April ice map. There was a total of 93 bergs south of the forty-eighth 

 parallel during the month 



temperatured waters. During the next 24 hours this berg drifted 

 a total of 17 miles and then a strong northerly gale broke it up 

 rapidly into many growlers. 



The 18th, 19th, and 20th were days of excellent visibility and the 

 patrol ship took good advantage of the opportunity to search the 

 eastern slope of the Grand Bank from the Tail to the forty-fifth 

 parallel of latitude. Only three bergs were found in this zone; all 

 of them had been carried by the cold current inshore on to the shelf, 

 15 to 40 miles inside of the edge of the Bank. 



