1913-14.] The Hall and Transverse Therm omagnetic Effects. 217 
Hall Effect . — This was measured in magnetic fields of strengths of about 
8000 and 22,000 units, and at temperatures of 15 6° C. and 99'8° C. 
Temperature of Plate = 15*6° C. 
Temperature of Plate = 99 ‘8° C. 
Field. 
E x 10 7 . 
Field. 
E x 10 7 . 
8,200 
-2-61 
8,000 
-2-00 
22,000 
-2-76 
21,500 
-2-06 
The coefficient R is negative and is but slightly affected by the strength 
of the magnetic field. The numerical value of R decreases very consider- 
ably with increasing temperature. 
Temperature coefficient of R in field of 22,000 units = — 0-0038. 
Zinc. Thickness of plate — 015 mm. 
Thermomag netic Temperature and Potential Effects . — These were 
measured in magnetic fields of three different strengths, and at temperatures 
of 46-4° C., 74-4° C, and 128-3° C. 
Temperature of Plate 
= 46-4° C. 
Temperature of Plate 
= 74-4° C. 
Temperature of Plate 
= 128-3° C. 
Field. 
S x 10 7 . 
Q x 10 4 . 
Field. 
S x 10 7 . 
Q x 10 4 . 
Field. 
SxlO 7 . 
Q x 10 4 . 
7,700 
+ 1-04 
+ 1-24 
7,700 
+ 0-95 
+ 1-35 
7,700 
+ 0-83 
+ 1-30 
13,500 
+ 1-05 
-h 1*26 
13,300 
+ 0-98 
+ 1-34 
13,500 
+ 0-80 
+ P26 
21,100 
+ 1-06 
+ 1-32 
21,200 
+ 0-97 
+ 1-44 
21,400 
+ 0-82 
+ 1-20 
The coefficients S and Q are both positive, and they vary slightly 
with variation of magnetic field. The value of S decreases steadily 
with increasing temperature. The value of Q increases up to a certain 
temperature, beyond which an increase in temperature produces a de- 
crease in Q. 
Temperature coefficient of S in field of 21,000 units for range — 
46*4° C. to 74-4° C. = - 0-0030. 
74-4° C. to 128-3° C.= -0-0030. 
46-4° C. to 74*4° C.= +0-0032. 
74-4° C. to 128-3° C.= -0 0031. 
Q 
