Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General' s Office, Calcutta, 

 in the month of May, 1865. 



Monthly Eesults. 



Mean height of the Barometer for the month, 

 Max. height of the Barometer occurred at 9 a. m. on the 13th, 

 Min. height of the Barometer occurred at 4 p. m. on the 30th, 

 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 

 29.651 

 29.854 

 29.415 



0.439 

 29.719 

 29.578 



0.141 



Mean Dry Bulb Thermometer for the month, . . 

 Max. Temperature occurred at 3 & 4 p. m. on the 5th, 

 Min. Temperature occurred at 7 A. m. on the 10th, 

 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 

 83.4 

 94.8 

 73.0 

 21.8 

 90.3 

 78.0 

 123 



Mean Wet Eulb 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, .. .. 



78.9 



4.5 



75.7 



7.7 



Inches 



0.873 



Troy grains 

 Mean Weight of Vapour for the month, .. .. .. 9.36 



Additional Weight of Vapour required for complete saturation, . . 2 60 



Mean degree of humidity for the month, complete saturation being unity, 0.78 



Rained 22 days, Max. fall of rain during 24 hours, 

 Total amount of rain during the month, 

 Prevailing direction of the Wind, .. .. 



Indies 

 2.77 

 15.94 

 S. & S. E. 



