b'0-4 Mr. S. Russ on Distribution in Electric Fields of 
Table 1. 
Positive Electrode. 
Negative Electrode. 
Pressure in mms. 
Activity. 
Pressure in mms. Activity. 
•on 
69 
•006 
142 
•013 
79 
•008 
189 
•137 
84 
•102 
•125 
173 
157 
•202 
81 
•476 
42.') 
•250 
62 
•739 
736 
•608 
•792 
63 
67 
1165 
1118 
Neutral Electrode. 
•865 
56 
Pressure in nuns. 
Activity. 
•922 
56 
•152 
•435 
72 
64 
1-102 
57 
•722 
57 
1-140 
62 
1 mm. the activity o£ the cathode is about 20 times that o£ 
the anode, at *01 mm. it is only about twice as much. 
At this stage of the work it was decided to compare the 
activities of the cathode and anode at much higher pressures. 
Several trials with the apparatus just described were rnade 
at pressures higher than 1 cm., but discordant results were 
obtained. This was probably due to the emanation being- 
blown back into the spiral on allowing air to enter the vessel 
V, which was initially well exhausted as in the previous 
experiments. 
For this reason observations were made with a modified 
system consisting simply of a brass cylinder dowm the centre 
of which passed a brass rod (provided with end-pieces to 
ensure uniformity of field) w T hich was connected to cells giving 
the same voltage as before. The brass cylinder was connected 
on one side with a small vessel which was filled with the 
emanation at atmospheric pressure, and on the other w r ith a 
pump and pressure-gauge. 
The small vessel containing the emanation was provided 
with metal electrodes, and the precaution was taken of 
applying a strong electric field to the emanation before letting 
it into the brass vessel ; this removed any active deposit or 
dust particles. 
