NO. II 



ATM OS I' H K R 1 C (Y/A) N E FO WLE 



parent to radiatiuii out-going from the earth. It was ol).serve(l in the 

 laboratory by Ladenburg and Lehman,' and bv the writer in the 

 solar spectrum." 



A set of atmospheric transmission coefficients, freed as carefully 

 as was possible from the effects of non-selective absorptions due to 

 water vapor, dry dust, and particles associated with water vapor and 

 called wet dust, was published by the writer in earlier i:)apers.' The 

 observations are .shown in figure i, redrawn from Fabry's article 

 {loc. cit.). Cabannes and Dufay* used this data to .show that the 



I'lc. 2. — Almosplicric ab.sorption in Chappuis yellow ozone band (Colanse). 



departures from the straight line of the points at wave-lengths greater 

 than 0.4729/i were caused Iw ozone present in the atmosphere. Mak- 

 ing the assumption that the atmospheric ozone amounts to 0.32 cm. 

 ntp., they used the differences of ordinates between the observed 

 jjoints and the straight line, in the region of ligiu'e i, just indicated, 

 to calculate values of the absorption coefificients of ozone for a 

 standard dei)th of 1 cm. ntp. Figure 2 shows the 7 resulting values 

 plotted as circles and also a curve showing transmission coefificients 



' Ann. d. Phys. 21, 305, 1906. 



'' Smithsonian Misc. Coll. 68, i, 1917. 



^ Astrophys. Journ. 38, 392, 1913 ; 40, 43.=^. iQM- 



* Journ. de Phys. et le Rad. Sept. 1926. 



