538 A. \1. BATEMAN KENNECOTT GLACIER OF ALASKA 



probably clue to the formation of crevasses. A base line and triangulation 

 stations were established on the adjacent land, and by means of a sur- 

 veyor's transit the positions of the flags were accurately measured from 

 the triangulation stations. The readings were recorded and plotted by 

 means of coordinates. 8 



The positions were first measured on September 28, 1918. The same 

 triangulation stations were again occupied on September 21, 1919, 358 

 days later, but unfavorable weather prevented the completion of the 

 measurement.- Sixteen days later (October 7, 1919) triangulation sta- 

 tions were again occupied and the final measurements taken. All of the 

 readings were then plotted by coordinates on the accompanying map 

 (figure 6). An attempt was made to obtain further measurements the 

 following year, but the stakes had disappeared. 



RESULTS 



The data of movement for the 374-day period are shown below T , as are 

 also the data for the shorter period. 



Stake Distance from Period. Totai movement Movement 



edge. per day. 



1 680 feet, 374 days 19.0 feet 0.61 inches 



2 1,130 feet 374 days ....... 41 . 5 feet 1 . 33 inches 



8 2,180 feet 374 days 61.5 feet 1.97 inches 



4 3,080 feet 374 days 85.0 feet 2.73 inches 



3 2,180 feet 16 days 1.2 feet 0.87 inches 



4 3,080 feet 16 days 1.9 feet 1.40 inches 



5 3,670 feet 16 days 5.0 feet 3.77 inches 



DISCUSSION OF RESULTS 



It is interesting to note that the daily rate of movement for the 16- 

 day period at the end of September is much slower than for the whole 

 year, by just about one-half. It will be observed that the rate of move- 

 ment increases outward from the edge of the glacier, as would be expected. 

 The curve (figure 7) was plotted to show the relation between the rate of 

 movement and the distance outward. This curve is surprisingly close to 

 a straight line, indicating a progressively uniform increase in rate with 

 distance outward from the edge of the glacier. 



The data show that the movement of Kennecott Glacier is unusually 

 slow. It is measured in inches per day, as contrasted with movements of 

 feet per day obtained from measurements of many glaciers. Incidental 

 observations on other glaciers in this same section of Alaska suggests that 



8 The writer is indebted to D. C. Hoyt, chief engineer, Kennecott Copper Corp., Kenne- 

 cott, Alaska, for this work and results. 



