Mete 07'o log ica l Obser vat ion s . 
Vll 
Abstract of the Results of the Hourly Meteorological Observations 
talcen at the Surveyor General's Office , Calcutta , 
in the month of April, 1861. 
Monthly Results. 
Mean height of the Barometer for the month, 
Max. height of the Barometer occurred at 9 & 10 A. M. on the 25th, 
Min. height of the Barometer occurred at 4 p. m. on the 29th, 
Extreme range of the Barometer during the month, 
Mean of the Daily Max. Pressures, 
Ditto ditto Min. ditto, 
Mean daily range of the Barometer during the month, 
Indies 
29.711 
29.885 
29.535 
0.350 
29.785 
29.640 
0.145 
o 
Mean Dry Bulb Thermometer for the month, 
Max. Temperature occurred at 2 p. m. on the 3rd, 
Min. Temperature occurred at 6 a. m. on the 23rd, 
Extreme range of the Temperature during the month, 
Mean of the daily Max. Temperature, 
Ditto ditto Min. ditto, 
Mean daily range of the Temperature during the month, 
Mean Wet Bulb Thermometer for the month,.. 
Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, 
Computed Mean Dew-point for the month, 
Mean Dry Bulb Thermometer above computed Mean Dew-point, 
Mean Elastic force of Vapour for the month, 
Mean Weight of Vapour for the month, 
Additional Weight of Vapour required for complete saturation, 
• • 
85.6 
* 9 
100.8 
72.0 
28.8 
• • 
95.6 
78.3 
17.3 
• • 
78.2 
• • 
7.4 
74.5 
• • 
11.1 
Inches 
• • 
0.840 
Troy 
• • 
grains 
8.98 
• • 
3.78 
ity, 
0.70 
Inches 
• • 
0.16 
• • 
0.31 
S. 
Rained 7 days, Max. fall of rain during 24 hours, 
Total amount of rain during the month, 
Prevailing direction of the Wind, .. 
