18 THE ROYAL SOCIETY OF CANADA 
concentration of the emanation at a distance x from the salt assuming 
K, = A,/p we have as shown above 
—_ V us p x 
TNR Jie 
N/A 

Let now D be the concentration at the same point of the positively 
charged active deposit particles and assume that D -— a P where a is 
some function of the pressure p 
We have then 

V Sie 
( - 
D eae : 
NANG 
or if aq ¥ 
Frs 
a PX 
Poeme eae ae 
BN; 
For the pressure corresponding to the maximum cathodic deposit 
dD 
= ——— nC!) 
dp 
À . i 7 | | ] 
and this gives dj Se V Ar Oot eee) 
y dp ‘ 2p 
According to Kennedy's results, we have also the relation 
DSC MN OR SN ES ere be ee ater ES (4) 
and combining equations (3) and (4) we have 
Deas | Ly ix À 
— — —— == — — —= 0 
v dp 2p 2.3 A, 
P 
c 
v.e., log y + 4 log p + ag V À ce 
Pp | 
i a teas 
or log yp* = — — + ¢, wherea—c + 
