THEORETICAL EFFECTS OF PRESSURE WAVES. 



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lo) Lb) 



Fig. 69. Modified pressure distribution. = 180°. 



= 180°, ^^wre 69. — The pressure distribution is now undergoing very rapid change. 

 There is an appreciable gradient for easterly winds over the east of the Barrier. If this 

 distribution continued without change the air from the east of the Barrier would flow over 

 to the west, raise the pressure there and give a strong southerly wind near to Cape Evans. 

 The pressure distribution has, however, only just been established and there can as yet be 

 very little air motion near Cape Evans where there is little pressure gradient. There would 

 probably bo a light southerly wind and all the premonitions of a coming blizzard. 



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