CHAPTER IX 



THE HEIGHT OF THE BARRIER AND THE SOUTH POLAR PLATEAU. 



The height of the Barrier. 



Nearly all the sledging parties which visited the Barrier had aneroid barometers and 

 from their records it is possible to determine the mean height of the Barrier with some 

 certainty. 



The barometers were compared with the standard at Caps Evans when each party left 

 and when it returned. From these comparisons the corrections to be applied were determined. 



The corrected readings have been compared with the simultaneous pressure at Cape Evans 

 and the differences tabulated. 



The track of all the parties on the Barrier was practically the same and has been shown 

 on the map which forms the frontispiece to this volume. After leaving Hut Point the Barrier 

 was reached at Safety Camp from which point the track went almost due east to Corner 

 Camp in 78" 3' S., 168" 59' E. At this camp, as its name impUes, the track turned sharply 

 to the south and the whole of the remainder of the journey to the foot of the Beardmore 

 Glacier was made on or near to the 169" E. meridian. 



The observations have been collected into convenient geographical groups and the mean 

 difference between the simultaneous pressure on the Barrier and at Cape Evans determined 

 for each group. The results are contained in the following table : — 



Table 150. 



Mean pressure difference between Cape Evans and the Barrier during the period November 1911 



to January 1912. 



