354 



Mr Townsend, Electrical Properties of [Nov. 22, 



and ~- , which have in general to be taken account of when deal- 

 ing with the motion of gases, can be omitted in equations (1) since 

 p does not vary from point to point. 



When the gas is in a closed vessel the mutual repulsion of the 

 carriers of the electricity drives them to the sides where the}'' 

 either remain so close to the walls that they cannot be blown out, 

 or else get discharged against the sides. The charged gas 

 remaining in the vessel has a uniform density given by equation 

 (2), and if the vessel which contains it is an insulated conductor 

 connected to a pair of quadrants of an electrometer the deflection 

 on the electrometer scale will be proportional to p when the charged 

 gas is blown out of the vessel. 



(10) In order to investigate experimentally the rate at which 

 the gas loses its charge to the sides of an inductor, or in other 

 words to find how the density p will vary with the time, a metal 



: :?, 



s 



A 



Fig. 4. 



cylinder G, figure 4, 30*2 centimetres long and 1"6 centimetres in 

 diameter, was used. The two ends of the cylinder fitted into 

 paraffin blocks P t and P 2 , into which were also fixed the glass 



