( 1230 ) 
dp d’y dy 
jr = d di TE = — 
(a t (5 ) ae (Zar 
or 
5 dp de\ dT 
== = (AO — | da -— | — aes 
dx rT da? PT da oT ip 
TBN 
a (2 == 5) 
2 
And: aas Hen Aer 
d i? “(1 ) dT 
Be is ey edd Pe Ei 
dae Jor da° Jor v of i 
From this we find: 
d*w 
) I gave (These Proc. June 1910) in the form: 
vl 
dar? 
The value of ( 
dx* ET, 
dp _ RT jl + (n—-l)e a 
rT ne (1—2) ZoRT 
But there has an error slipped in there, which is indeed without 
influence for small value of 2, but which I must yet rectify. As this 
would here divert us from the question we are dealing with, I shall 
discuss the way in which the rectification is obtained, later on, and 
now only give the corrected value. We should find: 
d’ 1 a 
(£9) oer 
‚det JT 
ELN 2e REN 
nn (l—e)| 1 — er 
sth dz\ , : 
Substituting the value of (7 =) in equation (@) we find with a 
n 
high degree of approximation (for small value of 2): 
UC 
oa) 
1=~»(#) 2 Sie de A ER 
of 
dz RT 
If we write the value of p in the following form: 
are 
