564 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. 
0 
Inches. 
Inches. 
Inches. 
Inch. 
Inch. 
Inch. 
Sept. 1 
63 
62*5 
392*65 
60 
29*887 
2 
59 
59 
392*13 
54 
29*767 
3 
58 
58 
393*51 
53 
29*852 
4 
58 
58 
392*56 
54 
29*786 
5 
62 
62 
392*11 
63 
29*721 
6 
64 
63*5 
391*94 
64 
29*846 
7 
61 
60*5 
392*48 
56 
29*835 
8 
58*5 
58 
390*97 
54 
29*656 
9 
57 
57 
389*34 
53 
29*541 
10 
57*5 
58 
392*14 
66*5 
29*720 
11 
57 
57 *5 
394*18 
56 
29*908 
12 
58*5 
59 
396*36 
59 
30*101 
13 
59 
59*5 
396*79 
57*5 
30*159 
14 
59-5 
60 
395*80 
59 
30*071 
15 
59 
59 
396*24 
56 
30*100 
16 
59 
59 
396*76 
59 
30*150 
17 
59 
59-5 
397*09 
58. 
30*190 
18 
59 
59 
395*54 
58 
30*069 
19 
59-5 
59 
397*32 
58 
29*884 
20 
57-5 
58 
392*70 
52 
29*798 
21 
58-5 
59 
391*64 
59 
29*745 
22 
59 
59 
393*04 
56*5 
29*857 
23 
58 
57*5 
395*68 
55 
30*029 
24 
59-5 
59-5 
396*70 
59*5 
30*152 
25 
60 
60 
394*59 
59 
30*001 
26 
61 
61 
393*83 
61 
29*958 
27 
61 
61 
392*83 
60 
29*855 
28 
62 
6T5 
390*77 
60 
29*680 
29 
62-5 
62-5 
388*51 
62 
29*577 
30 
63 
63 
387*34 
62*5 
29*502 
Means. . .. 
59-6 
59-7 
393*45 
58*1 
29*880 
28*879 
l'OOl 
*560 
*441 
