no. 3 



RADIATION OF THE ATMOSPHERE ANGSTROM 



77 



Iii order to get a general idea of the conditions, I will assume that 

 Siiring's formula : 



e h = e -e 26oeV * 20 ) 



holds for the distribution of the humidity, and that the temperature 

 gradient is constant up to an altitude of 5,000 m. I will consider 

 the following special cases : 



I The temperature gradient is o.8° per 100 meters. 

 II " " " " o.6° " " 



The pressure of the aqueous vapor at the earth's surface is : (a) 

 5 mm. ; (b) 10 mm. ; (c) 15 mm. 



The effective radiation R t at different altitudes can then be calcu- 

 lated according to the formula : 



i? t = T 4 - 0.170 [I + I.26-*- - 069 '] • 10- 1 ? 



where p can be obtained from Siiring's formula, and where en has 

 to be corrected for the conditions pointed out in chapter V, B, of 

 this paper. In table XIIa are given, (1) the temperature it), (2) 



the pressure of aqueous vapor (en), (3) the corrected pressure (p) 

 and, finally, the effective radiation (R) at different altitudes. In 

 table XIIb the same quantities are given for a temperature gradient 

 of o.6° per 100 meters. Figure 14 gives the curves, drawn from 



