790 
Proceedings of the Royal Society 
Temperature 
of Hole. 
Difference of 
Temperature. 
Galvanometer Deflection. 
Mean. 
No. 1. 
325° C.? 
310°? 
215, 220, 225, 220, 225, 235, 240, ) 
230, 240, 240, 237, 245, 235, 
220, 250, 230, . . J 
► =231-7 
2. 
00 
o 
CM 
193° 
140, 140, 135, 130, 142, 130, 130, ) 
130, 132, 128, 132, 130, 130, ( 
185, 130, 132, 135, 140, 140, ( 
140, 130, 135, 135, . . J 
■ = 134- 
3. 
144° 
129° 
90, 90, 90, 92, 90, 85, 85, 90, 85, ) 
87, 85, 85, 90, 85, 80, 80, 90, 1 
85, 90, 90, , . J 
[• = 85- 
4. 
103° 
88° 
62, 60, 60, 60, 55, 60, 55, 60, 60, ] 
60, 60, . . . J 
| = 69-27 
6. 
78° 
63° 
42, 42, 44, 44, 44. 40, 50, 47, 50, ] 
47, 50, . . . j 
| = 45-5 
6. 
66° 
41° 
38, 35, 32, 30, 30, 32, 35, 35, 33, ‘ 
35, 35, 35, 35, 35, 35, 38, 38, 
35, 35, 38, 
| = 34-7 
The following are the means of a great number of experi- 
ments, the mean values of the current being all multiplied by a 
common factor : — 
No. 1. No. 2. No. 3. 
Difference of 
Temperature 
In Degrees 
Cent. 
Current. 
Difference of 
Temperature 
in Degrees 
Cent. 
Current. 
Difference of 
Temperature 
in Degrees 
Cent. 
Current. 
21° 
19- 
50° 
55-5 
9° 
9-6 
30° 
30- 
53° 
64-5 
14° 
13- 
42° 
38-3 
63° 
68- 
20° 
19- 
60° 
59- 
68° 
70- 
28° 
26- 
88° 
89- 
74° 
73- 
39° 
34- 
92° 
90- 
88° 
89- 
61° 
65- 
134° 
132-5 
105° 
101- 
84° 
76- 
136° 
135- 
109° 
105- 
124° 
120- 
139° 
138- 
129° 
127* 
131° 
120- ? 
140° 
142- 
152° 
120- ? 
196° 
192- 
167° 
161-5 
? 
314- 
193° 
201- 
2 
266- 
2 
347- 
With the same apparatus as in the foregoing, I next tried heat- 
ing both wires considerably above the temperature of the room, 
