Siemens Ozonizer Ub 
SOME CHARACTERISTICS OF A SIEMENS OZONIZER. 
KARL B. MCEACHRON. 
For a number of years the Engineering Experiment Station at 
Purdue University has been conducting an investigation entitled, “The 
Fixation of Atmospheric Nitrogen by the Silent Discharge Process.” 
In the course of this work a study has been made of certain types of 
discharge tubes, and very brief discussion will be given here of some 
of the results of the tests on the Siemens tube. 
Discharge Tube and Absorption Apparatus. 
Ozone 
Apparatus 
Figck: 
An idea of the construction of this tube may be gained by refer- 
ence to Fig. 1, which shows the tube supported by a ring stand in a 
tank of cooling water. The tube was constructed of two glass tubes 
arranged concentrically, the inside one being sealed at the bottom. The 
space between the two tubes was closed at either end with paraffine, 
and small tubes so placed that air could enter at one end of the annular 
space between the tubes and leave at the other end. The radial length 
