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SCIENCE PROGRESS 



quantity of ozone, but the data are not available for calculating 

 the magnitude of this equilibrium value. 



It may be inferred that as the light of the small wave-length 

 necessary for the formation of ozone cannot penetrate any large 

 distance into the atmosphere, this formation of ozone must be 

 confined to the very high layers of the atmosphere. 



Part 4. The Estimation of Ozone in the Atmosphere 



at High Altitudes 



A. On Mountains. — The reaction vessel which was used to 

 enable the application of these measurements in atmospheric 

 determinations was devised so as to be suitable for use in 



Fig. 2. 



mountain districts, and also for attaching to sounding balloons. 

 It was necessary in this last case to provide protection for the 

 vessel on striking the ground, and in order to obtain the 

 desired altitude, a total weight of two ounces could not be 

 exceeded. 



The absorbing vessel which was used to contain the reagent 

 consisted of a spherical glass bulb as shown in fig. 2. This was 

 provided with an inlet and an outlet tube terminating in conical 

 funnels (C C) on the outside, and projecting on the inside for 

 some distance inside the bulb. A quantity of reagent could thus 



