Meteorological Observations. lxxxvii 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 

 in the month of April, 1860. 



Monthly Eesults. 



Inches 



Mean height of the Barometer for the month, . . . . 29.759 



Max. height of the Barometer occurred at 11 p. ar. on the 18th, . . 29.921 



Min. height of the Barometer occurred at 4 p. M. on the 30th, .. 29.608 



Extreme range of the Barometer during the month, . . . . 0.313 



Mean of the daily Max. Pressures, . . . . . . 29.826 



Ditto ditto Min. ditto, .. .. .. 29.684 



Mean daily range of the Barometer during the month, . . . . 0.142 



o 



Mean Dry Bulb Thermometer for the month, . . . . 84,9 



Max. Temperature occurred at 2 p. in. on the 30th, .. .. 100.8 



Min. Temperature occurred at 6 A. M. on the 18th, .. .. 72.2 



'Extreme range of the Temperature during the month, . . . . 28.6 



Mean of the daily Max. Temperature, .. .. .. 94.2 



Ditto ditto Min. ditto, .. .. .. 77.3 



Mean dailg range of the Temperature during the month, .. 16.9 



Mean Wet Bulb Thermometer for the month, .. .. 78.2 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, . . 6.7 



Computed Mean Dew-point for the month, .. .. .. 74.8 



Mean Dry Bulb Thermometer above computed Mean Dew-point, . . 10.1 



Inches 

 Mean Elastic force of Vapour for the month, . . . . 0.849 



Troy grains 

 Mean Weight of Vapour for the month, .. .. .. 9.07 



Additional Weight of Vapour required for complete saturation, . . 3.42 



Mean degree of humidity for the month, complete saturation being unity, 0.73 



Inches 

 Rained 8 days, Max. fall of rain during 24 hours, .. .. 1.02 



Total amount of rain during the month, . . . . . . 2.47 



Prevailing direction of the Wind, .. .. S. & S. E. 



