790 
Proceedings of the Pioyal 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. 
208° 
193° 
140,140, 135,130,142, 130,130 ,) 
130, 132, 128, 132, 130, 130, ( 
135, 130, 132, 135, 140, 140, 
140, 130, 135, 135, . . j 
CO 
1 — 1 
II 
3. 
144° 
129° 
90, 90, 90, 92, 90, 85, 85, 90, 85,1 
87, 85, 85, 90, 85, 80, 80, 90, 
85, 90, 90, , . J 
11 
CO 
c< 
4. 
o 
CO 
O 
rH 
o 
00 
00 
62, 60, 60, 60, 55, 60, 55, 60, 60, 1 
60, 60, . . . J 
I = 69-27 
5. 
78° 
63° 
42, 42, 44, 44, 44, 40, 50, 47, 50 ,} 
47, 50, . . . J 
[ = 45-5 
6. 
56° 
41° 
38, 35, 32, 30, 30, 32, 35, 35, 33,' 
35, 35, 35, 35, 35, 35, 38, 38, 
l = 34-7 
35, 35, 38, 
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° 
54-5 
14° 
13* 
42° 
38-3 
63° 
68- 
20° 
19- 
60° 
69- 
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- 
9 
266- 
9 
• 
347- 
With the same apparatus as in the foregoing, I next tried heat¬ 
ing both wires considerably above the temperature of the room, 
