Siemens Ozonizer MWe 
Exp. Nod. 
Pressure immillimeters 
Time in minutes 
a- 5.6 vol. fNO b-.6 vol. 4.NO 
RiGr 2: 
The curve in Fig. 2, taken from Spiel,* who made tests on a 
Siemens tube with induction coil supply, shows a decrease in pressure 
with time, until a reversal point is reached, after which the pressure 
rises rapidly, coming back to nearly if not quite the original pressure. 
Runs Using Duplicate of Spiels Tube 
Induction Coil Supply at about 
25 Vibrations per mince, 
Milli-amperes 
*The Formation of Nitric Oxides by the Silent Electric Discharge in a Siemens’ 
Tube, by Hugo Spiel, Doctor’s Thesis, The Technical High School; Vienna, 1909. 
