1913-14.] Resistance of Iron in Crossed Magnetic Fields. 267 
substances ; but of this we cannot be certain until the same experiments 
have been carried out with cobalt. I hope also to be able to make a similar 
study of the properties of bismuth. Meanwhile, I leave over any further 
theoretical discussion. I cannot, in fact, add anything to what was said in 
the earlier paper ; and I am not aware that anyone has been able to make 
even a plausible suggestion as to the molecular mechanism on which these 
phenomena in crossed magnetic fields depend. 
My thanks are due to Miss J. G. Dunlop and Miss M. Jazewska, who 
determined for me with great care the change with temperature of the 
resistance of the iron ribbon. 
Appendix. 
Results as reduced in Laboratory Note-Book, arranged approximately 
ACCORDING TO DATE IN THE YEAR 1913. 
The numbers in the columns headed Resistance Change give the changes of resistance, 
estimated per 10,000, of the metal strip. 
h and £ represent respectively the longitudinal and transverse fields. 
The temperatures are calculated from the resistances of the metal ribbon. 
Iron. 
Date, 
Fields, 
Temp. 
Cvclic 
Field. 
Steady 
Field. 
Resistance 
Change. 
Date, 
Fields, 
Temp. 
Cyclic 
Field. 
Steady 
Field. 
Resistance 
Change. 
July 22 
h 
None 
+ 
3-69 
h= 59-6 
h 
+ £ 
+ 
1T2 
£ = 898 
h 
-£ 
+ 
1-22 
37° C. 
h 
None 
+ 
3-96 
h 
+ £ 
+ 
1T7 
£ 
None 
- 
2'7 
£ 
+ h 
- 
4-72 
£ 
-h 
- 
5-12 
h = 59-6 
h 
None 
+ 
4-58 
July 23 
h= 120-4 
h 
None 
+ 6-25 
£ = 1282 
h 
£ 
+ 
0*49 
£ = 1282 
h 
£ 
+ 2-43 
37° C. 
t 
None 
- 
5-88 
160° C. 
£ 
None 
- 5-73 
£ 
h 
- 
10T1 
£ 
h 
- 10-83 
£ 
None 
- 
5-09 
h = 59-6 
h 
None 
+ 
3-76 
ft = 120-4 
h 
None 
+ 6-83 
£ = 2156 
h 
£ 
+ 
0-36 
£ = 2095 
h 
£ 
+ 0-52 
37° C. 
£ 
None 
- 
7-84 
160° C. 
£ 
None 
- 7-97 
£ 
h 
- 
11-51 
£ 
h 
- 13-9 
k = 59’6 
h 
None 
+ 
3-79 
7i= 120 
h 
None 
+ 6-24 
£ = 3781 
h 
£ 
+ 
0-04 
I £ = 3796 
h 
£ 
+ 0-09 
37° C. 
t 
None 
— 
8-98 
160° C. 
t 
None 
- 9-41 
£ 
h 
— 
12*46 
£ 
h 
-15-8 
