Meteorological Observations. 
xlvii 
Abstract of the Results of the Hourly Meteorological Observations 
taken at the Surveyor General" 1 s Office, Calcutta , 
in the month of September, 1861. 
Monthly Eestjlts. 
Inches 
Mean height of the Barometer for the month, .. 29.665 
Max. height of the Barometer occurred at 8 A. M. on the 27th, 29.879 
Min. height of the Barometer occurred at 2 r. m. on the 4th, 29.368 
Extreme range of the Barometer during the month, 0.511 
Mean of the Daily Max. Pressures, 29.722 
Ditto ditto Min. ditto, .. .» 29.604 
Mean daily range of the Barometer during the month, 0.118 
o 
Mean Dry Bulb Thermometer for the month, 83.7 
Max. Temperature occurred at 3 p. M. on the 17th, 91.8 
Min. Temperature occurred at 5 a. m. on the 5th, 78.6 
Extreme range of the Temperature during the month, 13.2 
Mean of the daily Max. Temperature, •• 88.6 
Ditto ditto Min. ditto, .. 80.1 
Mean daily range of the Temperature during the month, 8.5 
Mean Wet Bulb Thermometer for the month,.. .. 80.1 
Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, 3.6 
Computed Mean Dew-point for the month, .. .. 78.3 
Mean Dry Bulb Thermometer above computed Mean Dew-point, 5.4 
Mean Elastic force of Vapour for the month, 
Inches 
0.949 
Troy grains 
Mean Weight of Vapour for the month, 10.18 
Additional Weight of Vapour required for complete saturation, 1.89 
Mean degree of humidity for the month, complete saturation being unity, 0.84 
Inches 
3.01 
12.48 
S. 
Rained 22 days, Max. fall of rain during 24 hours, 
Total amount of rain during the month, 
Prevailing direction of the Wind, .. 
