98 ROYAL SOCIETY OF CANADA 
From (3) and (4) it is easily deduced that with an absorbing 
material the value of the ionization current in the testing vessel will 
be less, and the speed of air current required for the maximum ioniza- 
tion current will be greater, than in the case of the same volume of a 

Fe 16x 
non-absorbing substance; and, the ordinates of the curve will be the less 
and the maximum ordinate displaced the further to the right along the 
g-axis, the greater the quantity of absorbing substance. 
TABLE 3. 
EMANATION THROUGH CHARCOAL TUBES TO TESTING VESSEL. 










TUBE F. TUBE D. TUBE G. 
Diameter, 6 mm. Length | Diameter, 6 mm. Length | Diameter,6 mm. Length 
of Char. space, 2 cm. of Char. space, 8 cm. of Char. space, 31.5 cm. 
Weight of Char., 0.31| Weight of Char., 1.61 Weight of Char., 5.86 
gms. gms. gms. 
Ionization Ionization Ionization 
Flow in CRISE Flow in Current. Flow in CS 
celsec. | «436.5 x 10 celsec. | x 436.5 x 10 celsec. | x 436.5 x 10 
for amps. for amps. for amps. 
Nat. Leak 3.88 Nat. Leak 2.64 Nat. Leak 1.90 
ail 14.02 .26 4.98 .61 4.36 
el 63.4 .59 35.4 1.08 30.6E 
57 114.5 .61 40.5 15) 33.7 
.58 113.0 .69 49.0 1.39 47.0 
oil 131.6 .85 64.9 1.64 59.2 
.12 lore 1.08 86.4 1.88 69.0 
1.02 152.1 1.36 104.4 1.93 on 
1.37 167.6 1.84 118.0 2.11 81.4 
1.88 164.4 Nat. Leak 3.88 2.20 83.0 
2.16 14891 UNE Nat. Leak 2.40 
Nat. Leak (5 SNA EL QU END EE AR ES AO LE REA ae RU RUE ky ee ok oc 




