Xil 



Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutla 3 

 in the month of May 1870. 

 Monthly Results. 



Mean height of 1 lie Barometer for the month... 

 Max. height of the Barometer occurred at 9 a. m. on the 1st. 

 Min. height of the Barometer occurred at 5 p. m. on the 30th. 

 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. 



, 29.001 



, 29.810 



. 29.394 



. 0.410 

 29.G7L 



, 29.525 



. 0.146 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 4 p. M. on the 9th. 

 Min. Temperature occurred at 7 p. m, on the 19th. 

 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. 



87.7 

 103.(3 

 75.0 

 28.0 

 97.1 

 80.5 

 16.6 



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 



80.0 



7.1 



70.3 



11.4 



Inches. 

 0.890 



Troy grain. 



Mean Weight of Vapour for the month ... ... ... 9.48 



Additional Weight of Vapour required for complete saturation ... 4.08 

 Mean degree of humidity for the month, complete saturation being unity 0.70 



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



o 



130.2 



Inches. 



Rained 10 days,— Max. fall of rain during 21 hours ... ... 0.43 



Total amount of rain during the month ... ... ... 0.92 



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

 meter during the month ... ... ... ... ... 0.75 



Prevailing direction of the Wind S, S by W & S .S. W. 



