Siemens Ozonizer 179 
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2. When air in the tube has been in contact for a considerable 
period with other air which has been previously subjected to electrical 
discharge, the usual pressure decrease is modified, the yields diminished, 
and in case sufficient contamination has taken place the characteristics 
of the tube changed altogether, the pressure increasing instead of de- 
creasing and the yield greatly reduced or eliminated altogether. 
3. While it is true that the discharge is more or less erratic in 
a given tube, yet there seems to be some foundation for the statement 
