FIELDS OF PRESSURE AND MASS IN THE ATMOSPHERE. 



117 



t> ?_ gQ IS 10 5 5 l p IS 2,0 B5 50 3S ' *Q 1p iO S5 <tt 7tf 



3Q g5 HO IS 10 5 !Q A3 50 35 ." US T ' '5 SO S3 TO 





Fig. 23. Field of mass, Nov 7, 1901, represented by charts giving the average density (10~ s ton/m J ) of the air between level 

 surfaces, or the difference of pressure between these surfaces in m-bars. 



