xxxu 



Meteorological Observation*. 



Abstract of the Results of the Hour!// Meteorological Observation* 

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

 in the month of April 1870. 

 Monthly Besults. 



Mean height of Hie Barometer for the month... 



Maw height of the Barometer occurred at lo a. m. oh the 3r I. 



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



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. 



2!>.7.-)7 

 . 211.1) IS 



29.832 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 1 p. if. on the 1st. 

 Min. Temperature occurred at t> a. If, on the 11th. 

 Extreme range of the Temperature during the month 

 Mean of the daily Max. Temperature 



Ditto ditto Min. ditto. 

 Mean daily range oi' the Temperature during the month, 



o 

 84.1 



67.7 

 30.9 

 94.5 

 76.1 

 18.4 



Mean Wet Bull) Thermometer for the month ... 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 



Computed Mean Dew-point for the month 



Mean Dry Bidb Thermometer above computed mean Dew-point ... 



Mean Elastic force of Vapour for the month 



75.1 



8.3 



7o.O 



14.1 



Inches. 



0.727 



Troy grain. 



Mean Weight of Vapour for the month ... ... ... 7.78 



Additional Weight of Vapour required for complete saturation ... i. flj 

 Mean degree of humidity for the month, complete saturation being unity 0.G1 



o 

 Mean Max. Solar radiation Thermometer for the month ... 128.3 



Inches. 



Bained 11 days. — Max. fall of rain during 24 hours ... ... 127 



Total amount of rain during the month ... ... ... 4.03 



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

 meter during the month ... ... ,,, ... ... 3.38 



Prevailing direction of the Wind ' S & S .S. W. 



