550 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 105 



SEA-LEVEL PRESSURE AT 10° INTERSECTIONS 



Lat. 40° N. Long. 60" E. 



950 mb. + 



Mean 77.7 72.0 69.4 63.9 61.1 54.4 51.4 54.5 62.1 70.2 74.9 76.5 



66.7 



Mean 78.1 73.6 69.9 63.9 60.8 54.4 51.8 54.9 61.6 69.7 74.9 77.6 



66.9 



