INTERNATIONAL ANTARCTIC CO-OPERATION. 



CHARTS OF MEAN SEA LEVEL PRESSURE AND AIR TEMPERATURE. 



APR IL 





NORMAL PRESSURE. 



MEAN PRESSURE, NOON, G.M.T. 1902. 





1*0* ISO' ISO' 170' 180' 170' 



140 ISO* 160" 170 IBQT 170 KO ISO 140* 



40' 30' 20' 10' O* 10" 20* 30' 4O* 



NORMAL AIR TEMPERATURE. 



APRIL 



MEAN AIR TEMPERATURE, NOON, G.M.T. 1902. 



I4Q* ISO* l0* 170' IBO' 170' ISO 180 I4C* 



SO* 20* 10* 0* 10" 2O" 



140* ISO* 160' 170" ISO* 170* 160* ISO* 140' 



3O" 20' 



20 1 30' 40' 



For explanation see Key map 



