77 



Normal number of icebergs south of the forty-eighth parallel {menace to the Cape 



Race tracks) 



January 3 j April. 



Fehruarj' 10 j May. 



March 36 ! June. 



83 



130 



68 



Julv 25 



August 13 



September 9 



October... 

 November. 

 December. 



Normal number of icebergs south of the Grand Bank (menace to the United States 



to Europe tracks) 



January.. 

 February 

 March — 



01 April 9 



1 1 May 18 



4 1 June 13 



July 



August 



September. 



3! October 



2 j November. - 

 1 December.-- 



Fi<;. 24.— The normal monthly distribution of icebergs in the western North Atlantic— (o) south of 

 Newfoundland (48th parallel); (&) South of the Grand Bank. The black area represents the span 

 of the normal ice season as interpreted by the ice patrol 



The monthly distribution throughout a normal year is represented 

 by the two curves on Figure 24. The space between the two dotted 

 vertical lines embraces the normal ice season, March to July. It 

 can be seen from the foregoing that there are really no ice-free months 

 on the Cape Race tracks, while there are only four such months on 

 the United States to Europe tracks. 



In the course of the research work which has been carried on by 

 the International Ice Patrol there has been plotted on a chart the 

 position of those icebergs reported by steamships during the period 

 1900-1926. This material has been taken from the file of United 

 States Hydrographic OfRce publications, principally the Hydro- 

 graphic Bulletin. 



