Meteorological Observations. 
xxxi 
Abstract of the Results of the Hourly Meteorological Observations 
taken at the Surveyor General*s Office, Calcutta, 
in the month of July, 1861. 
Monthly Kesults. 
Mean height of the Barometer for the month, 
Max. height of the Barometer occurred at 10 A. M. on the 13th, 
Min. height of the Barometer occurred at 5 P. M. on the 17th, 
"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, .. 
Inches 
29.534 
29.678 
29.259 
0.419 
29.586 
29.474 
0.112 
Mean Dry Bulb Thermometer for the month, 
Max. Temperature occurred at 3 p. m. on the 8th and 11th, 
Min. Temperature occurred at 7 p. M. on the 30th, .. 
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, 
o 
83.1 
91.6 
78.4 
13 2 
87.3 
80.2 
7.1 
o 
Mean Wet Bulb Thermometer for the month, .. .. 79.S 
Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer,.. 3.3 
Computed Mean Dew-point for the month, .. .. 78.1 
Mean Dry Bulb Thermometer above computed Mean Dew-point, .. 5.0 
Inches 
Mean Elastic force of Vapour for the month,.. .. .. 0.943 
Troy grains. 
Mean Weight of Vapour for the month, .. .. .. 10.12 
Additional Weight of Vapour required for complete saturation, .. 1.74 
Mean degree of humidity for the month, complete saturation being unity, 0.85 
Inches 
Rained 26 days, Max. fall of rain during 24 hours, .. .. 2.40 
Total amount of rain during the month, .. .. .. 10.93 
Prevailing direction of the Wind, .. .. S. & E. & S. W. 
