ELECTRIFICATION OF AIR, VAPOUR OF WATER, AND OTHER GASES. 207 



bent as shown. A gas burner, G, was fixed in a brass tube which was connected by 

 sealing wax to a bent glass tube varnished with shellac leading in from the gas 

 supply. 



49. The method of experimenting was as follows : The gas was lit at the 

 burner, G, and the machine started. The machine was worked for 4 minutes at 

 potentials from 3000 to 10,000 volts in different experiments. At the instant of 

 stopping the machine the gas supply was stopped, and an indiarubber cork put into 

 the tube, U, which was used to keep the gas in the cylinder at atmospheric 

 pressure during the electrification. Ten strokes of the pump were taken in every 

 experiment, immediately or after the lapse of certain intervals of time from stopping 

 the machine. 



The results of a large number of experiments performed in May, 1895, are briefly 

 summarised in the following table : 



ELECTRIFICATION OF AIR BY ELECTRIFIED COAL-GAS FLAME. 



50. We now electrified the air in the glass cylinder by six needle points 

 without flame. The method of experimenting was in other respects exactly the 

 same as before. A very wonderful result was noticed, namely, that short times 

 of electrification at 5000 volts gave greater results as indicated by electrometer and 



filter than longer times of electrification. 





