INTERNATIONAL ANTARCTIC CO-OPERATION. 



CHARTS OF MEAN SEA LEVEL PRESSURE AND AIR TEMPERATURE. 



APRIL 



NORMAL PRESSURE. 



MEAN PRESSURE, NOON, G.M.T. I9O2. 



30 20" 10 O CO" 2O 30* 





ISO 160 170 160 170 (60 ISO' 



30* 20' 10* 0" 10" 20' 30* 



NORMAL AIR TEMPERATURE. 



APRIL 



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



For explanation >ee Key m&p 



