350 



Mr Townsend, Electrical Properties of [Nov. 22, 



the electrometer scale. The gas was not passed through any glass 

 wool before entering I so that as much spray as possible should be 

 carried from the cell. 



/2&> 



Fig. 2. 



The cell was at a low temperature, 11° to start with, and a 

 current of 10 amperes was switched on which gradually warmed 

 the electrolyte. During the first nine minutes that the current 

 was on and the gas entering the inductor, no electrification what- 

 soever was detected, and no cloud could be observed over the water 

 in B. During these nine minutes the temperature of the cell 

 rose from 11° to 18°, 



During the next five minutes a deflection of 9 divisions 

 negative was obtained and the temperature of the cell had risen 

 to 21-5. 



At a temperature between 22 and 23 a thin cloud began to 

 appear over the water in B and the spot of light was then moving 

 at the rate of 4 divisions per minute, so that before the cloud 

 becomes distinctly visible a small electrification of about 2 x 10 -4 

 Electrostatic units per c.c. is necessary. When the current is 

 continued and the cell becomes hotter the electrification on the 

 gas increases and the cloud becomes denser. 



(6) In order to show that the cloud disappears when the 

 charge on the gas is removed the temperature of the cell was 

 raised to 48° and, with the same apparatus as was used for the 

 last experiment, the three following results were obtained. 



(a) When the gas passes from the cell to the inductor with- 

 out filtering through glass wool a dense cloud was observed over 



