NO. 9 



DETERMINATION OF OZONE WULF 



Figure 5 shows an area analogous to the one shown earher, deter- 

 mined from the transmission coefficients for March 24, 1929, as a 

 typical day used simply as an illustration. The logarithms of the 



0.0Z5 



'-020 



0.0:5 



0.010 



0.005 



4000 5000 6000 7000 6000 



Fig. 5. — Ozone area for March 24, 1929. 



9000 



transmission coefficients for this day, read for all the wave lengths 

 selected in this work, were plotted against wave length and a smooth 

 curve passed through the values lying to both sides of the ozone 

 absorption, and the differences of the points lying in the ozone region 

 from the smooth curve were read. These differences were then 

 plotted against wave length to the scale used above, yielding the area 



