Meteorological Observations. 
xv 
Abstract of the Hesults of the Hourly Meteorological Observations 
taken at the Surveyor General's Office , Calcutta , 
in the month of May, 1861. 
Monthly Kesults. 
Mean height of the Barometer for the month, 
Max. height of the Barometer, occurred at 9 A. M. on the 1st, 
Min. height of the Barometer, occurred at 4 p. M. on the 23rd, 
"Extreme range of the Barometer diming the month, 
Mean of the daily Max. Pressures, .. .. 
Ditto ditto Min. ditto, .. .. 
Mean daily range of the Barometer during the month, .. 
Inches 
29.610 
29.850 
29.369 
0.481 
29.679 
29.531 
0.148 
Mean Dry Bulb Thermometer for the month, .. 
Max. Temperature occurred at 3 p. M. on the 1st, .. 
Min. Temperature occurred at 7 P. M. on the 9th, .. 
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 
85.9 
100.0 
72.4 
27 6 
94.5 
79.0 
15.5 
o 
Mean Wet Bulb Thermometer for the month, .. .. 79.6 
Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer,.. 6.3 
Computed Mean Dew-point for the month, .. .. 76.4 
Mean Dry Bulb Thermometer above computed Mean Dew-point, .. 9.5 
Inches 
Mean Elastic force of Yapour for the month,.. .. .. 0.893 
Troy grains. 
Mean Weight of Yapour for the month, .. .. .. 9.53 
Additional Weight of Yapour required for complete saturation, .. 3.34 
Mean degree of humidity for the month, complete saturation being unity, 0.74 
Rained 20 days, Max. fall of rain during 24 hours, 
Total amount of rain during the month, .. 
Prevailing direction of the Wind, .. 
Inches 
1.60 
9.07 
S. &E. 
