1 8 Mc Doug ALL and Howles, Nitric Acid from Air. 



rising to 20 amperes. This behaviour is what one would 

 have expected. By introducing a choking coil into the 

 circuit, however, a flame was readily obtained. Simulta- 

 neously, the voltage at the electrodes fell to 600 when the 

 latter were about 9 mm. apart. The voltage was now 

 gradually run up. More flames were got into operation, 

 until finally eight were working quite steadily. This 

 result was obtained by including in the circuit of each 

 flame two choking coils, each with 600 turns of wire. 

 Even with this adjustment the electrodes got hotter than 

 when the transformer was used. 



The following table shows the drop in volts at the 

 electrodes when the flames were working. 



The gap or distance between the electrodes is the 

 maximum consistent with the steady working of the 

 flame. 



When the tension reached 5,500 volts, the voltmeter 



