SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 



8S 



absorption being something greater or less than zero, here illustrated 

 as less than zero, but this will not obscure the increased value of the 

 ratio in the region of ozone absorption showing as an increase above 



•i-0.010 



■hO.005 



'0.005 



-0.0 10 



-0.0! 5 



4000 



5000 



6000 7000 



Fig. 3. — Typical ozone area. 



8000 



9000 



the smooth curve passing through the values of the points on both 

 sides of the absorption. It is the area under this curve above the 

 smooth curve which is closely proportional to the amount of ozone 

 in the path. 



Figure 3 shows the results of one typical day's observations. For 

 clearness of illustration Figure 2 was made similar to this. In this case 



