214 
Proceedings of the Royal Society of Edinburgh. [Sess. 
Results. 
Nickel: — Thickness of plate = 0-275 mm. 
The thermomagnetic temperature and potential effects were measured 
in magnetic fields of various strengths and at three temperatures, namely, 
43° C, 61-5° C., and 126° C. 
Temperature of Plate = 43° C. 
Temperature of Plate = 61 *5° C. 
Temperature of Plate = 126° C. 
Magnetic 
Field. 
S x 10". 
Q x 10 4 . 
Magnetic 
Field. 
SxlO 7 . 
Q x 10 4 . 
Magnetic 
Field. 
S x 10 7 . 
Q x 10 4 . 
2,000 
-7T0 
-3P0 
2,900 
-5*55 
- 78-0 
4,200 
-6-80 
-29*5 
4,800 
-515 
-76-5 
6,500 
-6-62 
-27-5 
6,800 
-4-70 
-68*5 
8,300 
-5-78 
-23*5 
8,500 
-5*30 
-34-5 
8,300 
- 4T7 
-58-6 
14,500 
19,100 
-3-50 
- 14-5 
12,000 
-3-01 
1—41*4 
-2*78 
-1P5 
17,350 
— 2T2 
-29-0 
21,900 
- 2-42 
-10-0 
22*600 
— 2-*25 
-14*5 
22,100 
-1*78 
-23*5 
... 
22,800 
- 1-74 
-22-2 
The coefficients S and Q are both negative, and vary greatly with the 
strength of the magnetic field. The numerical value of the coefficients 
decreases as the field strength increases. 
An increase of temperature causes a decrease in the numerical value of 
S, but a very large increase in the numerical value of Q. 
Magnetic 
Field. 
Range of 
Temperature. 
Temperature 
Coefficient of S. 
Temperature 
Coefficient of Q. 
8,500 | 
43° C.-6P5° C. 
- 0-0039 
+ 0-027 
61*5° 0.-126° C. 
- 0-0033 
+ 0-011 
22,000 | 
43° C.-61-5 0 C. 
- 0-0028 
+ 0-026 
61-5° 0.-126° C. 
- 0-0035 
+ 0-009 
Hall Effect . — This was measured in magnetic fields of strength varying 
from 2000 to 22,000 units, and at temperatures of 14° C. and 101° C. 
Temperature of Plate = 14° C. 
Temperature of Plate = 101° C. 
Field. 
R x 10 7 . 
Field. 
R x 10 7 . 
2,050 
-9-10 
2,100 
-12-0 
3,800 
-8-95 
4,060 
-10-9 
6,300 
-8-10 
6,400 
- 10-0 
8,200 
-7T0 
9,500 
- 7-27 
14,300 
-4-50 
18,800 
-3'59 
21,750 
- 3-21 
21*900 
- 3*48 
