IV 
Meteorological Observations. 
Abstract of the Hesults of the Hourly Meteorological Observations 
taken at the Surveyor General's Office, Calcutta, 
in the month of April, 1801. 
Hourly Means, tkc. of the Observations and of the Hygrometrical elements 
dependent thereon.— fContinued.) 
Hour. 
Mean Wet Bulb 
Thermometer. 
Drv Bulb above Wet. 
¥ 
Computed Dew point. 
Drv Bulb above Dew 
¥ 
point. 
Mean Elastic force of 
Vapour. 
Mean Weight of Va¬ 
pour in a Cubic foot 
of Air. 
Additional Weight of 
vapour required for 
complete saturation. 1 
1 i 
Mean degree of Hu¬ 
midity, complete satu-J 
ration being unity. | 
o 
o 
o 
0 
Inches. 
Troy grs. 
Troy grs. 
Mid- 
76.5 
4.4 
74.3 
6.6 
0.835 
8.99 
2.11 
0.81 
night. 
1 
76.4 
4.0 
74.4 
6.0 
.838 
9.04 
3.90 
.83 
2 
76.0 
3.8 
74.1 
5.7 
.830 
8.96 
.79 
.83 
3 
75.8 
3.6 
74.0 
5.4 
.827 
.95 
.67 
.84 
4 
75.7 
3.4 
74.0 
5.1 
.827 
.95 
.58 
.85 
5 
76.1 
3.0 
74.6 
4.5 
.843 
9.11 
.42 
.87 
6 
75.7 
3.1 
74.1 
4.7 
.830 
8.98 
.46 
.86 
7 
76.4 
3.3 
74.7 
5.0 
.846 
9.14 
.58 
.85 
8 
77.7 
5.5 
74.9 
8.3 
.851 
.13 
2.76 
.77 
9 
78.9 
7.5 
75.1 
11.3 
.857 
.13 
3.93 
.70 
10 
79.6 
9.2 
75.0 
13.8 
.854 
.05 
4.95 
.65 
11 
80.6 
11.1 
75.0 
16.7 
.854 
8.99 
6.24 
.59 
Noon. 
81.2 
12.5 
74.9 
18.8 
.851 
.93 
7.20 
.55 
1 
81.3 
13.6 
74.5 
20.4 
.840 
.81 
.88 
.53 
2 
81.5 
13.6 
74.7 
20.4 
.846 
.86 
.93 
.53 
3 
81,2 
13.3 
74.5 
20.0 
.840 
.81 
.70 
.53 
4 
80.3 
12.7 
73.9 
19.1 
.824 
.67 
.14 
.55 
5 
80.0 
10.6 
74.7 
15.9 
.846 
.93 
5.83 
.61 
6 
78.8 
8.6 
74.5 
12.9 
.840 
.94 
4.51 
.67 
7 
78.2 
6.9 
74.7 
10.4 
.846 
9.05 
3.52 
.72 
8 
77.7 
5.9 
74.7 
8.9 
.846 
.06 
2.97 
.75 
9 
77.1 
5.4 
74.4 
8.1 
.838 
.00 
.64 
.77 
20 
76.9 
5.0 
74.4 
7.5 
.838 
.00 
.44 
.79 
11 
I 
76.5 
4.9 
74.0 
7.4 
.827 
8.91 
2.36 
.79 
All the Hygrometrical elements are computed by the Greenwich Constants, 
