808 
Proceedings of the Eoyal Society 
If the deflections be A, a , B, b , C, e, D, d, and so on, then .the 
average of A, a - B, b - C, c - D, &c., will be the measure of the 
Peltier effect. 
The following tables give some of my results ; the first column 
gives the direction of the current and the period of time the current 
was kept on, and the other columns give the corresponding deflec- 
tions 
i. 
II. 
in. 
IV. 
Iron — Lead. 
Iron — German 
Silver. 
Lead— Silver 
(Standard). 
Iron- 
-Zinc. 
Min. 
20° C. 
85° C. 
20° C. 
93° C. 
22° -5 C. 
98° -5 C. 
23° -8 C. 
99° C. 
+ 2 
-70 
-82 
100 
39 
62 
100 
70 
off i 
0 
- 2 
65 
15 
31 
26 
30 
1 
2 
70 
59 
-35 
-100 
-20 
-36 
-75 
-50 
off i 
0 
0 
-30 
-60 
3 
4 
-20 
- 3 
+ h 
-72 
-79 
70 
60 
38 
61 
90 
76 
0 
0 
44 
40 
15 
28 
25 
36 
1 
2 
70 
69 
-47 
-90 
-30 
-43 
-105 
-43 
0 
-20 
-55 
- 8 
- 3 
-27 
- 0 
+ 4 
-77 
70 
50 
27 
64 
82 
72 
- — 
-12 
51 
5 
27 
17 
58 
-h 
58 
-45 
-40 
45 
-104 
-26 
— 
-12 
-20 
+ 70 
-17 
- 8 
-28 
+ 20 
+ 4 
- 72 ' 
80 
-45 
19 
57 
81 
101 
45 
- 2 
22 
18 
62 
-49 
-45 
52 
-105 
-22 
- 22 
12 
15 
58 
- 5 
19 
-46 
-47 
I also tried Pb. brass with a one-cell Bunsen battery; with my 
