in producing Electric Conductivity in Gases. 
299 
Relation betiueen Current and E.M.F. 
4. As the results at moderate pressures are more or less 
similar to those at atmospheric pressure, we shall go at once to 
the effects at low pressures. The numbers below show the relation 
between the current and the E.M.F. at a pressure of two-thirds of 
a millimetre, the wire being charged negatively. 
Potential of the Current in arbitrary 
wire in volts units 
40 
80 
160 
240 
280 
320 
19 
38 
61 
78 
99 
135 
The curve in Fig. 2 is drawn from these numbers. 
Fig. 2. 
The current does not reach a maximum as it does when the 
