562 PROFESSOR DANIELL ON THE WATER-BAROMETER ERECTED 
1831. 
Thermometers. 
Water- 
Barometer. 
Tempera¬ 
ture of 
Mercury. 
Mercurial 
Barometer. 
Water- 
Barometer 
reduced to 
Mercury. 
Difference. 
Elasticity 
of Vapour. 
Difference. 
In. 
Out. 
Inches. 
o 
Inches. 
Inches. 
Inch. 
I nch. 
Inch. 
July 1 
60 
60 
396*67 
59 
30*030 
2 
61 
61 
395*55 
59 
29*959 
3 
62 
62 
394*97 
61 
29-935 
4 
62-5 
62-5 
397-17 
61 
30*126 
5 
64 
64 
397-06 
63 
30*165 
6 
65 
64*5 
398-21 
64 
30*259 
7 
64*5 
64*5 
398-23 
63 
30*269 
8 
64 
64 
397-16 
62 
30*167 
9 
65 
64*5 
396*03 
63 
30*093 
10 
68 
68 
393*38 
67 
29-977 
11 
63*5 
63*5 
392*76 
62 
29-832 
12 
65 
65 
389-30 
64 
29-586 
13 
64 
64*5 
389-02 
63*5 
29-627 
14 
63 
62*5 
390-74 
63 
29-668 
15 
62 
62*5 
391-02 
62 
29-679 
16 
62*5 
62*5 
391-23 
63 
29-697 
17 
62 
62*5 
393*50 
63- 
29-878 
18 
62-5 
62 
394*58 
62*5 
29-956 
19 
62-5 
62 
393*18 
62*5 
29-860 
20 
63 
62*5 
391-65 
62*5 
29-750 
21 
64-5 
64 
389-78 
65 
29-626 
22 
62 
61*5 
392*13 
63 
29-756 
23 
62-5 
62 
392*10 
63 
29-768 
24 
61-5 
61*5 
391-80 
60 
29-730 
25 
63 
62*5 
394*73 
61 
29-985 
26 
63 
62*5 
396*11 
61*5 
30*097 
27 
65 
64*5 
396*30 
63 
30*166 
28 
67-5 
67 
394*68 
66 
30*097 
29 
67*5 
67 
394*02 
66 
30*034 
30 
31 
Means.. .. 
63-5 
63*3 
393*90 
62*7 
29-923 
28-912 
1*011 
•636 
*475 
