Meteorological Observations. 
xxxix 
Abstract of the Results of the Hourly Meteorological Observations 
taken at the Surveyor General's Office, Calcutta, 
in the month of September, 18G0. 
Monthly Results. 
Inches 
Mean height of the Barometer for the month, . . . . 29.6G7 
Max. height of the Barometer occurred at 10 A. M. on tho 28th, .. 29.796 
Min. height of the Barometer occurred at 4 a. M. on the 20th, .. 29.417 
Extreme range of the Barometer during the month, . . . . 0.379 
Mean of the Daily Max. Pressures, .. .. .. 29.730 
Ditto ditto Min. ditto, .. .. .. .. 29.600 
Mean daily range of the Barometer during the month, .. .. 0.130 
o 
Mean Dry Bulb Thermometer for the month, . . . . 83.4 
Max. Temperature occurred at 2 & 3 p. m. on the 22nd & 29th, .. 91.2 
Min. Temperature occurred at 4 a. m. on the 21st, .. .. 77.2 
Extreme range of the Temperature during the month, . . . . 14.0 
Mean of the daily Max. Temperature, .. .. .. 88.5 
Ditto ditto Min. ditto, .. .. .. 80.3 
Mean daily range of the Temperature during the month, .. 8.2 
Mean Wet Bulb Thermometer for the month,.. .. .. 80.4 
Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, .. 3.0 
Computed Mean Dew-point for the month, .. .. .. 78.9 
Mean Dry Bulb Thermometer above computed Mean Dew-point, .. 4.5 
Inches 
Mean Elastic force of Vapour for the month, .. .. .. 0.967 
Troy grains 
Mean Weight of Vapour for the month, .. .. .. 10.37 
Additional Weight of Vapour required for complete saturation, .. 1.59 
Mean degree of humidity for the month, complete saturation being unity, 0.87 
Inches 
Rained 19 days, Max. fall of rain during 24 hours, .. .. 1.46 
Total amount of rain during the month, .. .. .. 7.13 
Prevailing direction of the Wind, .. .. .. S. &E.&S. E. 
