204 
Proceedings of the Royal Society of Edinburgh. [Sess. 
127, which is calculated from the resistances in the circuit, and this reduc- 
tion gives 10,000 times the value of what I have called above dM/M. 
In the continuation of the experiment of June 6 which follows, H 
stands for the longitudinal field and T for the transverse field, “ longi- 
tudinal ” meaning along the length of the strip whose resistance is being 
measured, and “ transverse ” at right angles to this direction. The suc- 
cessive readings of the galvanometer which fill the first three columns of 
numbers now run across the page, each set of three forming one measure- 
ment. The first and third are the readings obtained with the steady 
current in the positive direction, the second that obtained with the current 
reversed. The fourth column contains the deflections, which are the 
differences between the second column numbers and the mean of the corre- 
sponding first and third column numbers. 
Experiment of June 6, 1906 — continued . 
T = 8 cells. H = 1 1 cells. 
Cyclic 
T = 0. 
1st 
2nd 
Field. 
Readings. 
Difference. Difference. 
132*8 
84 
132-7 
-48-8 
+ H 
130 
111-8 
124 
-15-2 
+ 24-3 
121 
91 
121-3 
-30-2 
-H 
123-3 
117 
120 
- 4-7 
+ 22-2 
117 
94 
118 
-23-5 
Sum 
+ 46-6+ -955 
= +48-7 
+ T = 
1 1 "7 on g 
alv. 
137 
76-2 
138 
-61-3 
+ H 
150 
91 
145-3 
-56-7 
-2-1 
129 
81-5 
129-5 
-47-8 
-H 
142-5 
98-2 
138 
-42-1 
-1-4 
122 
88-4 
122 
-33-6 
Sum 
- 3"5 + -955 
+ H 
= 11 cells. 
3*7 
108 
132-5 
103 
+ 27 
-T 
128 
111-3 
124 
- 14-7 
-58 
92 
148 
85 
+ 59-5 
+ T 
111-3 
129 
104 
+ 21-3 
-58-5 
71 
168 
65 
+ 100 
Sum 
- 116-5 + -955 
= - 122 
H = 
= 0. 
' EEnmna 
58-2 
147 
62-2 
+ 86-8 
-T 
83 
128 
87-2 
+ 42-9 
-33-9 
72-5 
141-1 
76 
+ 66-8 
+ T 
94 
121-7 
96-8 
+ 26-3 
-33-7 
82 
134-2 
84-3 
+ 51-1 
Sum 
-67-6 + -955 
= - 70-8 
