xxxviii Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



in the month of May, 1857. 



Monthly Eesults. 



Inches. 

 Mean height of the Barometer for the month, .. .. 29.600 



Max. height of the Barometer, occurred at 9 A. M. on the 14th, . . 29.787 



Min. height of the Barometer, occurred at 4 p. M. on the 28th, . . 29.337 



Extreme Range of the Barometer during the month, . . . . 0.450 



o 



Mean Dry Bulb Thermometer for the month, . . . . 86.0 



Max. Temperature, occurred at 3 P. M. on the 1st, .. .. 100.0 



Min. Temperature, occurred at 11 P. M. on the 7th, .. .. 69-0 



Extreme Range of the Temperature during the month, .. .. 31.0 



o 



Mean Wet Bulb Thermometer for the month, . . . . 79.9 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, . . 6.1 



Computed Mean Dew Point for the month, . . . . 76.8 



Mean Dry Bulb Thermometer above computed Mean Dew Point, . . 9.2 



Inches. 

 Mean Elastic force of vapour for the month, . . . . . . 0.905 



Troy grains. 

 Mean weight of vapour for the month, . . . . . . 9.65 



Additional weight of vapour required for complete saturation, . . 3.26 



Mean degree of Humidity for the month, complete saturation being unity, 0.75 



Inches. 

 Rained 16 days. Max. fall of rain during 24 hours, . . . . 2.38 



Total amount of rain during the month, . . . . . . 9.33 



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



