29 



JULY 



As far as is known only one berg drifted south of latitude 48° during 

 July. As there was not enough ice to justify the drawing of an ice 

 chart for July the detailed positions of all ice reported south of latitude 

 49° 00' N. follows: 



The following tabular summary shows how the 1932 monthly berg 

 totals compare with those of the average year, the latter being based 

 on a study of iceberg reports from south of the forty-eighth parallel 

 for the period 1900-1926: 



Month 



Bergs 

 south of 



48° N., 

 1932 



South of 



43° N., 

 1932 



South of 

 48°, aver- 

 age 



South of 

 43°, aver- 

 age- 



January 



February.. 



March 



April 



May 



June 



July 



August 



September. 



Total. 







1 



43 



321 



90 



58 



1 



514 



3 

 10 

 36 

 83 

 130 

 68 

 25 

 13 



377 



PREDICTING ICEBERG DRIFTS 



The ice-patrol vessel tries to keep track from day to day of the 

 southernmost ice, particularly when it is in or near the trans-Atlantic 

 lane routes. This is done by daily visiting each berg that threatens 

 the steamer lanes. Its position, set and drift, together with the sur- 

 face sea water temperature, are carefully noted. "WTien watching 

 bergs the ice-patrol vessel can only scout the immediate area around 

 the berg. The usual procedure is for the ice-patrol vessel to drift 

 at night within several miles of the berg, then just at daylight to 

 proceed near enough to the berg to locate it accurately, and then 



161465—33 3 



