
ws 
Or 
eo) 
Emanation given of by Radium. 
by putting into the vessel D a charge of 
iF . Gee 
Go * ‘000145 x L0-* = 24 x 10-4 electromagnetic units, 
or by admitting into D 
2 1O- ; oy 
Se emanation particles. 
Again, the radiation from the emanation admitted into D 
in the above experiment produced such an ionization that, 
when T was. kept at a high potential, D got a charge corre- 
sponding to 100 scale-divisions in 47 seconds, with a capacity 
of *1 microfarad joined to the electrometer. 
This charge is produced by ions giving up their charge to 
D, the charge of each ion being e. 
The charge given to D per second is 
100 e 10° eel De? 
AT s«60 10 
The number of ions of either sign produced in D by the 
radiation from the emanation is therefore ; 
Doe Lge 
Tart Per second. 
=H) 3 LOE electromagnetic units. 
Each particle of emanation is therefore producing ions in the 
surrounding gas at the rate of 
or iy, aid a 
oe 3G. AO 
We see, therefore, that as the emanation, when admitted 
into D, did not produce a deflexion of more than 1 scale- 
division, it must either be uncharged, or, if charged, each 
particle of the emanation must give out radiation sufficient 
to produce at least 1400 ions per second. If the radiation 
from each particle were less than this, then the number 
required to give the observed ionization would be greater 
than what would produce | scale-division of a deflexion. 
This number is calculated on the assumption that the charge 
on the emanation is the same as the charge on the gaseous 
ion ; it is not probable that it is less than this, if charged at 
all ; and if it is greater, the number 1400 would be corre- 
spondingly greater. 
It is, however, quite likely that each emanation particle 
may be capable of producing ions in the vessel D at the rate 
of 1400 per second. For this reason the test was pushed a 
step further. 
== 14x, 10* per second. 
