2 66 Proceedings of the Royal Society of Edinburgh. [Sess. 
2. Under the influence of a transverse magnetization the electric resist- 
ance of iron and steel is diminished ; and this diminution becomes markedly 
greater when the transverse field is superposed cyclically upon a steadily 
maintained longitudinal field. In certain cases the change of resistance 
due to the transverse magnetizing force was more than doubled when this 
field was superposed upon the steadily maintained longitudinal field. 
It will be seen on referring to my earlier paper on the behaviour of 
nickel under crossed magnetic fields (1) that as regards the effect of the 
steady longitudinal field upon the change of resistance accompanying the 
application of a transverse field, exactly the same kind of phenomena are 
obtained with the iron and steel. 
On the other hand, as regards the effect of the steady transverse field upon 
the change due to the superposed longitudinal field, there was a peculiarity 
in the behaviour of nickel which is not found in the case of iron or steel. 
This peculiarity was that when the steady transverse field was above a 
certain value the change of resistance due to the superposed longitudinal 
field altered in sign, that is, the resistance was diminished, not increased. 
In the earlier experiments with nickel the arrangements did not permit 
the application of such large fields as were possible in the later experiments 
with iron and steel. Yet much greater values of the resistance change 
were obtained with the nickel than with the iron or steel, although these 
were subjected to much higher magnetizing forces. This will appear from 
the comparisons made in the short table below, in which -the changes of 
resistance in practically the same strengths of magnetizing fields are set 
side by side. The approximate values of the fields are given below each 
group of measurements. 
Changes of Resistance per 10,000. 
Longitudinal Field Cyclic. 
Transverse Field Cyclic. 
Nickel. 
Steel. 
Iron. 
Nickel. 
Steel. 
Iron. 
H 
+ 66 
+ 2-8 
+ 3-7 
T 
- 91 
-4*3 
-2-7 
H(T) 
-17 
+ 0-3 
+ 1*2 
T(H) 
-192 
-7-6 
-4-9 
h= 
60 
54 
60 
t = 
800 
700 
900 
t = 
800 
800 
900 
h 4 
60 
54 
60 
The main features of the phenomena here described are contained in 
this short table. The similarity of the effects produced in iron and nickel 
suggests that we are dealing with a fundamental property of ferromagnetic 
