+60 
+ 40 
+ 20 
0 
-20 
-40 
-60 
-80 
■100 
120 
140 
160 
■180 
Proceedings of the Royal Society of Edinburgh. [Sess. 
1 
) Field ?< 
- di 
- 'H 
) 
& 
■> 
l 
H(T) 
— T=100 
1 
H (T) 
— T=200 
V 
.Field 
H(T) 
- T=300 
- T=500 
hTt) 
- T=800 
1 1 
)0 ^ 2( 
ro 3i 
10 41 
10 51 
JO 5< 
J0~ 
J 
1 
T(H ) 
- H=10 
\ \ 
T(H) 
- H =20 
t(hT 
- H=30 
v\ 
T(H) 
- H=40 
" H = 50 
— H=60 
Fig. 1. 
