XXX 



Meteorological Observations, 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General* s Office, Calcutta, 



in the month of April, 1858. 



Monthly Eesults. 



Mean height of the Barometer for the month, 



Max. height of the Barometer occurred at 9 A. M. on the 22nd, 



Min. height of the Barometer occurred at 5 P. M. on the 24th, 



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. 

 29.772 

 29.920 

 29.566 



0.354 

 29.857 

 29.690 



0.167 



Mean Dry Bulb Thermometer for the month, 

 Max. Temperature occurred at 3 p. m. on the 19th, 

 Min. Temperature occurred at 8 p. m. on the 26th, 

 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, 



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, 



86.2 

 101.6 

 72.6 

 29.0 

 95.8 

 78.6 

 17.2 



o 



77.8 



8.4 



73.6 



12.6 



Inches. 



0.817 



Troy grains. 

 Mean Weight of Vapour for the month, . . . . . . 8.70 



Additional Weight of Vapour required for complete saturation, .. 4.29 



Mean degree of humidity for the month, complete saturation being unity, 0.67 



Rained 4 days, Max. fall of rain during 24 hours, 

 Total amount of rain during the month, 

 Prevailing direction of the Wind, 



Inches. 

 0.C0 

 0.97 



