SCIENTIFIC BALLOON ASCENSIONS VON BEZOLD 



3" 



In such cases the curves give us pictures of the changes during the 

 year that have great similarity^with those curves that I used pre- 

 viously for the presentation of the movements of heat within the 

 soil and which I have called "Tauto-chrones." 10 In order that these 

 latter should exactly correspond with the former we must use the 

 pressure instead of the altitude as ordinate, that is to say, the tables 

 as well as the diagrams must proceed by increase of pressure and not 

 by increase of altitude. 



But first the method of presentation hitherto used will be applied 

 to the respective seasons individually. Therefore I first of all com- 

 bine the values deduced by Besson 11 and Suring 12 in one table, No. 2, 

 which are then also presented in figs. 44 and 45. 



In the temperature curves (see fig. 44) for each season (S = sum- 

 mer; W = winter; F = spring; H = autumn) the influence of the 

 ground is evident in the same way as in the curves for individual 

 days that were collected together in fig. 41. 



Table 2. Tlte average conditions as to temperature and moisture for each 



season 



The summer curve shows decidedly the character proper to the 

 season of prevailing insolation whereas in the winter curve the 

 influence of the cooling of the ground is very evident ; the part played 



10 See figs. 56 and 57 of Memoir XV. "The Heat Exchange", Sitzungsbe- 

 richte, Berlin, 1892. (See No. XIX of this collection of translations.) 



11 Wissenschaftliche Luftfahrten, Vol. Ill, pp. 93-95. 



12 Wissenschaftliche Luftfahrten, Vol. Ill, p. 166. 



