was camera-equipped and photographs were made when possible. The 

 actual census, however, depended upon visual observation. The USCGC 

 Ingham provided surface support and weather data, including upper air 

 observations from a central location in Baffin Bay. 



The results of the 1948 census are shown in figures 7, 8, 9, 10, and 11. 

 Figure 7 shows the different flight tracks. A total of nine flights were 

 made. The key to the numbered flights appearing in figure 7 is as 

 follows : 



Figure 8 shows the results of the 1948 census on a single chart covering 

 the entire area. There appear to be two major concentrations in the area 

 in addition to the bergs distributed along the eastern side of Baffin Bay 

 from Disko Bay to Cape Melville. Of these two major concentrations, 

 one is located in the vicinity of Cape Dier, and the other to the north 

 between Cape York and Jones Sound. Figure 8 also shows the field ice 

 limits. Figures 9, 10, and 11 are on a different scale than is figure 8 and 

 show more clearly the details along the west coast of Greenland from 

 Disko Island to Smith Sound. They are intended to show the distribu- 

 tion of bergs in the fjords and along the glacier fronts. 



As most of the sea-going })ergs which later make their appearance in 

 le Grand Banks region come from the west Greenland glaciers of Disko 

 Bay and northward, it has been assumed that any summer's crop would 

 be found that summer distributed from Disko to Melville Bay. It also 

 has been assumed from what is known of the rates of drift south of Davis 

 Strait that in any summer the group of bergs which are to reach the 

 Grand Banks the following season will be centered just north of Cape 

 "^ier. It therefore has been reasoned that if no other concentrations of 

 ')ergs are present, the usual travel time from glacier to Grand Banks is 

 2 years; and that if other additional concentrations are found the travel 

 time in years may be taken as greater than two by the number of such 

 additional concentrations. The 1940 census pointed to a 2-year period. 

 The 1948 survey seems to indicate a 3-year period. 



In deducing travel time from the number of concentrations found 



n a census and the basic assumption that a concentration represents a 



'ear-class, it must be kept in mind that some year-classes may not be 



present as recognizable concentrations during any one census if: (1) A 



year-class of bergs is destroyed in transit around Baffin Bay; (2) the 



17 



