1189 
In connection with this 
cos p (TA Te == cag = olie Gaat ete 
C 
and the mean value determination I consists in this that (d) is integrated 
with respect to all the zones of the sphere parallel to BB’, and 
divided by the surface of the sphere. 
If we put 
A SSA 
this yields 
+a th 
1 AN OE 2p q 
EEND AID. iat ave dh cos Î h sin £ = 
47a’ c de c 2 
—=<¢ 0 
sin 200 
COS he 
(f 
> ij 
Jap sin — 
a } 9 0 
sed 
210 
In this 
