IN THE HALL OF THE ROYAL SOCIETY. 
563 
1831. 
Thermometers. 
Water- 
Barometer. 
Tempera- 
ture of 
Mercurial 
Barometer. 
Water- 
Barometer 
reduced to 
Mercury. 
Difference. 
Elasticity 
of Vapour. 
Difference. 
In. 
Out. 
Mercury. 
August 1 
o 
O 
Inches. 
o 
Inches. 
Inches. 
Inch. 
Inch. 
Inch. 
2 
67 
67 
391*40 
66*5 
29-831 
3 
67*5 
68 
390*84 
67 
29*818 
4 
67 
67 
390-32 
66 
29*756 
5 
68-5 
69 
398*14 
68 
29*603 
6 
67 
66-5 
399*34 
64 
29*655 
7 
66 
66' 5 
398-75 
66 
29*603 
8 
66 
66 
390*45 
64 
29*739 
9 
68 
68 
391*54 
67 
29*870 
10 
68 
68 
392*50 
65*5 
29*950 
11 
67 
67 
394*74 
64*5 
30*072 
12 
66 
66 
394*64 
63 
30*083 
13 
66-5 
67 
393*30 
64*5 
30*003 
14 
66 
66 
392*89 
63 
29*946 
15 
65*5 
65 
393*95 
62 
30*026 
16 
66 
66 
394*10 
63 
30*06] 
17 
65 
65-5 
393*46 
64 
29*992 
18 
64*5 
64 
392*67 
60 
29*895 
19 
62 
62 
389*78 
6l 
29*646 
20 
62 
62 
388*25 
60*5 
29*516 
21 
63-5 
64 
393*94 
63*5 
29*986 
22 
63 
62*5 
396*87 
61 
30*266 
23 
64-5 
64*5 
395*26 
63*5 
30*125 
24 
65-5 
65 
392*66 
63 
29*925 
25 
64*5 
64-5 
389*00 
63 
29*618 
26 
62 
62 
393*03 
59*5 
29*885 
27 
63-5 
64 
392*45 
64 
29*889 
28 
65 
64-5 
393*91 
60*5 
30*004 
29 
63 
62-5 
395*89 
59 *5 
30*141 
30 
64-5 
64-5 
394-55 
62 
29*876 
31 
66 
66 
391*42 
66 
29*880 
Means. . . . 
65*3 
65-3 
393*33 
62*0 
29*889 
28*870 
1*019 
•657 
*462 
