FIELDS OF PRESSURE AND MASS IN THE ATMOSPHERE. 



113 



30 2? 2U 15 i" 5 5 n> i". 8JJ g 3>l %S 1.0 



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|3 BO tfi to U i c i.: -<< 50 _3S . - 5_0 .).' ...' ii., ,.i 



X 



10 15 20 



Fig. 20. Field of mass, Nov. 7, 1901, represented by charts giving the average specific volume (m s /ton) of the air in isobaric 

 sheets, or the thickness of these sheets in dyn. meters. 



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yZ~ \ -- . 





