Meteorological Observations. 



xxxix 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor GeneraVs Office, Calcutta, 



in the month oj May, 1859. 



Monthly Eesults. 



Mean height of the Barometer for the month, . . 



Max. height of the Barometer, occurred at 9 P. M. on the 4th, 

 Min. height of the Barometer, occurred at 4 p. M. on the 20th, 

 "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, 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature, occurred at 3 p. M. on the 13th, 

 Min. Temperature occurred at 2 A. M. on the 5th, 

 Extreme Range of the Temperature during the month, 

 Mean of the Daily Max. Temperatures, 

 Ditto ditto Min. ditto, 

 Mean Daily range of the Temperatures during the month, 



Mean Wet Bulb 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, 



Inches. 

 29.699 

 29.905 

 29.500 



0.405 

 29.767 

 29.612 



0.155 



o 



86.1 

 99.4 

 72.0 

 27.4 

 95.5 

 78.4 

 17.1 



o 



79.2 



6.9 



75.7 



10.4 



Inches. 



0.873 



Troy grains. 

 Mean weight of vapour for the month, .. .. .. 9.32 



Additional weight of vapour required for complete saturation, . . 3.63 



Mean degree of Humidity for the month, complete saturation being unity, 0.72 



Eained 9 days. — Max. fall of rain during 24 hours, 

 Total amount of rain during the month, 

 Prevailing direction of the Wind, 



Inches. 



1.36 



3.18 



S. & S. E. &. E. 



