Inde 
No. 
SOIBO SS SU CS NOS 
1874. 
Date. 
1872. 
22nd March. 
23rd March. 
25th March. 
” 
26th March. 
27th March. 
” 
” 
28th March. 
* 
7th August. 
8th August. 
1873. 
21st July, 
25th Oct. 
27th Oct. 
29th Oct. 
30th Oct. 
3rd N ov. 
5th ‘Nov. 
6th Nov. 
10th Noy. 
1874. 
12th August. 
13th August. 
Pyrometer No, 404. 
Wrought-iron sheath ; coil not otherwise protected. 
heated for a short time in the fire before the first measurement was made. | 
ti 6. 
fo} fo} 
0 11:9 
10-2 12 
85 9:9 
Red-hot. as 
t 8-7 
Red-hot. + 
88 10°5 
8:8 10-6 
8 10-1 
Red-hot. ae 
9 11:3 
85 98 
Red-hot. ait 
9:5 11:15 
96 11:3 
10:5 11°5 
11:3 12-1 
18 19:1 
18 18:8 
20'1 21°5 
10°5 13 
105 13°5 
Red-hot. a 
85 11:5 
Red-hot, aa 
85 12 
Red-hot. ae 
10:0 13:0 
Red-hot 4hours.} ... 
11 13 
Red-hot3shours| ... 
11:5 13°75 
10 13 
17:22 18 
16°82 17:8 
il 
ti 
11 
11 
11 
This pyrometer was twice 
10-7056 
10°7063 
10°7005 
10-481 
10°9235 
10913 
Ryo» 10° 
9-911 
9-914 
9:927 
10°102 
10:225 
10-275 
10-291 
10-294 
10-283 
10-295 
10:307 
10-307 
10-309 
10:504 
10:503 
10-447 
10-476 
10°475 
10°578 
10-551 
10-618 
10-633 
10-761 
10°760 
10737 
10:737 
Observer. 
G.C.F. 
Pyromerer No. 445.—Coil surrounded by platinum sheath. 
38rd March. 
4th March. 
5th March, 
10th March. 
11th March, 
12th March. 
” 
12th August. 
13th August. 
t é. 
ie) ie) 
10:4 13-0 
Red-hot 2 hours.| ... 
10-25 ie lcs} 
Red-hot 4 hours.! ... 
10:3 11:4 
9:25 11:0 
9:65 11:4 
Red-hot 4 hours.| ... 
9-4 10-4 
7-0 8:0 
10:0 8:2 
97 84 
17:23 18-0 
19-91 17-9 
10-108 
35°D 
10-083 
B5°D 
10-069 
10-049 
10-058 
36'8 
10-044 
9-983 
10-074 
10-066 
10-239 
10-229 
Bio» 10° 
10-165 
10-080 
10-064 
10-075 
10-074 
10:064 
10:070 
10:069 
10:070 
10:040 
10-040 
Observer. 
Note.—A gas-furnace was employed for experiment 19 with pyrometer 414, and for 
experiments 2 and 4 with pyrometer 445, In all other cases the source of heat employed 
was a common open fire. 
* After this date No. 404 was used for some time by Professor Williamson, and was 
heated many times to moderate redness, 
