IN THE HALL OF THE ROYAL SOCIETY. 
559 
1831 . 
Thermometers. 
Water- 
Barometer. 
Tempera¬ 
ture of 
Mercurial 
Barometer. 
Water- 
Barometer 
reduced to 
Mercury. 
Difference. 
Elasticity 
of Vapour. 
1 
Difference. 
In. 
Out. 
Mercury. 
April 1 
o 
47-5 
O 
47 
Inches. 
404-81 
o 
50 
Inches. 
30-422 
Inches. 
Inch. 
Inch. 
Inch. 
2 
45-5 
45 
401-11 
49 
30-045 
3 
46 
46 
399-65 
49 
29-944 
4 
46-5 
46 
396-43 
50 
29-604 
5 
45-5 
45 
393-76 
49 
29-484 
6 
49 
49 
392-98 
50 
29-462 
7 
49 
49 
391-51 
47 
29-382 
8 
52 
52 
388-58 
54 
29-220 
9 
51 
51 
393-19 
54 
29-434 
10 
53 
53 
393-14 
55 
29-530 
11 
54 
54 
397-99 
55 
29-909 
12 
54 
54 
397-36 
53 
29-883 
13 
56 
56 
390-32 
53 
29-883 
14 
57 
57 
389-75 
54 
29-873 
15 
54-5 
54 
398-48 
55 
29-971 
16 
56 
56 
390-50 
54 
30-003 
17 
56 
56 
389-81 
53 
29-933 
18 
52 
52 
399-43 
53 
30-016 
19 
52-5 
52 
398-12 
48 
29-924 
20 
52 
52 
396-51 
51 
2 . 9-697 
21 
53 
53 
392-91 
49 
29-544 
22 
54 
54 
390-97 
52 
29-407 
23 
56 
56 
391-69 
52 
29-470 
24 
55*5 
55 
395-42 
53 
29-762 
25 
55 
55 
397-95 
53 
29-943 
26 
55 
55 
395-82 
52 
29-795 
27 
56 
56 
393-48 
53 
29-620 
28 
55-5 
55 
390-49 
52 
29-324 
29 
55 
55 
397-83 
51 
29-185 
30 
56 
56 
390-84 
56 
29-397 
• 
Means .. .. 
52-7 
52-5 
394-69 
51-9 
29-702 
28-970 
•732 
•432 
•300 
4 C 2 
