or 
06 Mr. E. F. Burton on a Radioactive 
intervals, and in Table V. are given the results of one of 
these tests, the time being taken from the closing of the 
iain, V.. 
{ uy —— 
bear ‘ | Current. . 
Time in Minutes. Arbitrary Scale. | 
D 738 | 
15 | 58°2 
) YD 50°6 
3D 472 
46 41°0 
D6 35°6 
6d ab°4 
75 | 32:0 
91 | 260 
200 | 16-7 | 
eylinder. In this particular case, the cylinder while filled 
with the air containing the emanation was maintained at a 
negative potential of 168 volts for 22 hours, and during this 
time the conductivity rose from its initial ralge of 158: 7 to 
F ae 4, 
Current 
0 20 40 60 80 100 120 740 160 180 200 
Minutes. 
a maximum of 226, and then fell to 176°3 before the expulsion 
took place. 
The curve given in fig. 4, in which the ordinates represent 
