Meteorological Observations. 



XXXI 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, in the 



mouth of April 1867. 



Monthly Results. 



Mean height of the Barometer for the month... 



Max. height of the Barometer occurred at 9 a. m. on the 18th 



Min. height of the Barometer occurred at 5 p. m. on the 5th 



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 mouth ... 



Inches. 



. 29.793 

 29.969 

 29.639 



. 0.330 

 29.869 



. 29.719 



. 0.150 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 3 p. m. on the 6th 

 Min. Temperature occurred at 6 a. m. on the 17th 

 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. 



84.9 

 102.5 

 71.2 

 31.3 

 95.7 

 76.5 

 19.2 



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 



76.0 



8.9 



69.8 



15.1 



Inches. 

 0.722 



Troy grain. 



Mean Weight of Vapour for the month ... ... ... 7.71 



Additional Weight of Vapour required for complete saturation ... 4.78 

 Mean degree of humidity for the month, complete saturation being unity 0.62 



Inches. 



Rained 10 days, — Max. fall of rain during 24 hours ... ... 0.13 



Total amount of rain during the month ... ... ... 0.27 



Total amount of rain indicated by the Gauge attached to the anemo- 

 meter during the month ... ... ... ... ... 0.21 



Prevailing direction of the Wind. 



s. w, & s. s. w, 



