M eieorological Observations. 



xl 



Abstract of (he Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



in the month oj May 1873. 



Monthly Hesults. 



Mean height of the Barometer for the month 

 Max. height of the Barometer occurred at Midnight on the 6th 

 Min. height of the Barometer occurred at 4 p. M, on the 31st 

 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 ,., 



Indies. 

 29.089 

 29.933 

 29.374 



0.559 

 29.750 

 29.610 



0.140 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 3 & 4 p. m. on the 21st 

 Min. Temperature occurred at 6 a. m, on the 5th 

 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 Bull) 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 



o 

 86.6 

 106.0 

 71.0 

 35.0 

 90.5 

 79.5 

 17.4 



. 79.3 

 7.3 



. 74,9 

 . 11.7 



Inches. 

 . 0.851 



Troy grain. 

 Mean Weight of Vapour for the month ... ... ... 9.06 



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

 Mean degree of humidity for the month, complete saturation being unity 0.09 



Mean Max. Solar radiation Thermometer for the month 



o 

 142.2 



Inches. 

 Earned 12 days, — Max. fall of rain during 24 hours^ ... ... 0.94 



Total amount of rain during the month ... ... ... 3.78 



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

 meter during the month ... ... ... ... ... 3.28 



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



* Height 70 feet 10 inches above ground. 



