Meteorological Observations. xxxii 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the month of April 1875. 



Monthly Results. 



Mean height of the Barometer for the month 



Max. height of the Barometer occurred at 9 a. m. on the 4th 



Min. height of the Barometer occurred at 4 p. m. on the 25th 



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. 

 . 29.705 

 . 29.912 

 . 29.488 

 . 0.424 

 . 29.776 

 . 29.633 

 . 0.143 



Mean Dry Bulh Thermometer for the month 

 Max. Temperature occurred at 3 & 4 y. u. on the 17th 

 Min. Temperature occurred at 6 A. m. on the 23rd 

 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 



o 

 85.4 

 102.5 

 73.3 

 29.2 

 95.6 

 78.1 

 17.5 



Mean Wet Bulh 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 



78.5 



6.9 



73.7 



11.7 



Inches. 

 0.819 



Troy grain. 

 Mean Weight of Vapour for the month ... ... ... 8.74 



Additional Weight of Vapour required for complete saturation ... 3.94 

 Mean degree of humidity for the month, complete saturation being unity 0.69 



Mean Max. Solar radiation Thermometer for the month 



o 

 140.0 



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



Total amount of rain during the month 



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



meter during the month 

 Prevailing direction of the Wind ,., S. 



Inches. 

 . 2.53 



. 4.18 



. 3.06 



* Height 70 feet 10 inches above ground. 



