242 
DR. A. A. EAMBAUT ON UNDERGROUND TEMPERATURE AT OXFORD 
Table III.—Coefficient of (0—14°). 
Plugs in 
B + C 
A + C 
Plugs in 
B + C 
A + C 
Plugs in 
B + C 
A + C 
Bridge wire 
reading. 
- 18 
0-0581 
0-0629 
Bridge wire 
reading. 
-5 
0-0612 
0-0660 
Bridge wire 
reading. 
+ 8 
0-0643 
0-0691 
17 
83 
31 
4 
14 
62 
9 
46 
94 
16 
86 
34 
3 
17 
65 
10 
48 
96 
15 
88 
36 
2 
19 
67 
11 
50 
•0698 
14 
90 
38 
-1 
22 
70 
12 
53 
•0701 
13 
93 
41 
0 
24 
72 
13 
55 
03 
12 
95 
43 
+ 1 
26 
74 
14 
58 
06 
11 
•0598 
46 
2 
29 
77 
15 
60 
08 
10 
•0600 
48 
3 
31 
79 
16 
62 
10 
9 
02 
50 
4 
34 
82 
17 
65 
13 
8 
05 
53 
5 
36 
84 
+ 18 
•0667 
•0715 
7 
07 
55 
6 
38 
86 
-6 
•0610 
•0658 
+ 7 
•0641 
•0689 
The temperature on the platinum scale corresponding to a resistance, II, is deduced 
from Callendar’s formula, 
^ = 100(R-R 0 )/(E ] -R 0 )^ .. (a.) 
where R x is the resistance at 100° C., and R 0 at 0° C., each of them being reduced to 
mean box units at the standard temperature (14°). 
From a very careful series of observations made at the Radcliffe Observatory on 
October 4 and 6, 1898, the following separate values of the zero points were obtained, 
each value being the mean of several closely accordant settings :—• 
Zero Points of the Thermometers. 
Thermometer . 
1 . 
2. 
3. 
4. 
5. 
1898, October 4 
0-306 
0-420 
0-481 
0-323 
„ 6 
■306 
•432 
•496 
•338 
0-239 
„ 6 
•305 
•434 
•498 
•333 
•239 
Adopted means 
0-31 
0-43 
0-49 
0-33 
0-24 
The temperature of steam was observed on October 4 and 5, with the following 
results for the several thermometers :—• 
* ‘ Phil. Trans.,’ A, vol. 178, p. 195. 
