ICE OBSERVATION 



Figure 12 is the southern ice map. On it is plotted all ice reported to 

 and sighted by the ice patrol within the limits of the chart during 

 1931. It shows also two reported icebergs (Nos. la and lb) from 

 September, 1930. The figures on the map are the numbers used in 

 the preceding table of ice and other obstructions. The map shows 

 the track of the General Greene while on the first cruise from March 27 

 to April 4, 1931. 



From the ice table and the chart it will be seen that the outstanding 

 feature of the 1931 season is the small amount of ice that drifted 

 south of the 48th parallel. The following brief description gives the 

 ice conditions for each month. 



SEPTEMBER, 1930 



One berg was reported from Cape Race radio station on the 5th 

 of September as in 48° 19' N., 49° 20' W., and one berg and a growler 

 on the 8th of September as in 47° 59' N., 48° 00' W. 



OCTOBER, NOVEMBER, AND DECEMBER, 1930 



So far as is known, no ice drifted south of the 48th parallel during 



these months. 



JANUARY, 1931 



No ice reported south of the 48th parallel. 



FEBRUARY, 1931 



No icebergs reported, but Cape Race radio station reported light 



field ice between 48° 15' N., 49° 57' W. and 48° 20' N., 49° 48' W., on 



February 9. 



MARCH, 1931 



Two icebergs (Nos. 3 and 4 on the ice map) were reported from 

 south of the 48th parallel. 



APRIL, 1931 



Several bergs were sighted by the ice patrol, but of these only one, 

 No. 13, was south of the 48th parallel. The General Greene drifted 

 with this berg from the 15th to the 22d of April and its path is shown 

 on Figure 13. The arrows indicate wind directions; and the figures, 

 force of mnd in the Beaufort scale. The black circles show the noon 

 positions. When we sighted the berg on the morning of the 15th of 

 April it had 3 pinnacles, the highest of which was about 120 feet. 

 The depth of water was 98 fathoms. Its drift, from its reported 

 position on the 14th of April, at 5.30 p. m., until the 16th at noon, was 

 in a southerly direction and the average velocity was 0.45 knots. 

 The wind during the first nine hours after the berg was reported was 

 generally southeast with force between 6 and 3. The rest of the time 



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