23 



forty third parallel. Shipping should be made to realize continually 

 the inability of the patrol to keep in close contact with bergs during 

 fog. This greatly increases danger along the tracks during thick 

 periods of weather over and near the Banks. 



Fully 75 bergs were reported east and northeast of St. Johns, New- 

 foundland, during the cruise. Almost all of these were expected to 

 ground or to disintregrate north of the forty seventh parallel. A few 

 would get south in the narrow stream of cold water flowing down 

 along the eastern edge of the Banks. Dynamic computations, 

 which checked well with recorded berg drifts, showed that in the 

 swiftest part this stream was setting south over 24 miles per day. 



Extreme southeasterly drift of bergs noted early in the season 

 had stopped. This was accounted for by the marked extension 

 north and northeast of the 60° and the 54° isotherms in the eastern 

 half of the ice-patrol area. The effect of seasonal solar warming was 

 noticeable in all the surface temperature reports that were received. 



THE FIFTH CRUISE, " MOJAVE," MAY 21 TO JUNE 5, 1928 



The annual surfboat race between the two ice-patrol cutters was 

 held on the morning of May 21 in 43° N., 51° W., as soon as the 

 Mojave had received the ice observation party. When the race was 

 over the Mojave hoisted her defeated boat and crew and headed 

 east on the lookout for bergs. 



Visibility was better than for seversl days and the search revealed 

 the southernmost known bergs to be in 42° 45' N., 49° 55' W., and 

 42° 42' N., 50° 25' W. They were last seen by the Modoc on the 17th 

 and had traveled about 70 miles to the southwest in four days. 



At daylight on May 22 a search was begun up the eastern edge of 

 the Banks from these bergs. Fog was soon run into, so the course 

 w^as reversed. The fog was outdistanced and, although it remained 

 in sight to the north all day, except for a few wisps it did not again 

 trouble the patrol vessel. 



An unknown berg which was reported as in 42° 25' N., 49° 38' W., 

 was run for, found, and examined. It was a small one of the dry- 

 dock type with three distinct peaks separated bj" water. The sea 

 was so smooth that this berg was examined closely from a boat. 

 Photographs were taken of it with the Mojave in the background. 

 It was not expected to last long because it was in 44° water and was 

 crackling almost incessantly as if its ice was under great tension and 

 stress. 



The 23d was a da}^ of glassy seas and calms. Unfortunately, it was 

 foggy most of the time. When visibility permitted search courses were 

 run for the solid berg seen the preceding day. It was found about 

 1.45 p. m. After circling it a search course was started to the west. 

 Shortly afterwards the fog closed in thick. It was determined to 



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