xli Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 

 taken at the Surveyor General's Office, Calcutta, 

 in the mouth of May 1875. 



Monthly Bksults. 



Indies. 



Mean height of the Barometer for the month ... ... ... 29.698 



Max. height of the Barometer occurred at 7 a. m. on the 3rd ... 29.912 



Mio. height of the Barometer occurred at 5 p. m. on the 9th. ... 29.519 



Extreme range of the Barometer during the mouth ... ... 0.393 



Mean of the daily Max. Pressures ... ... ... ... 29.771 



Ditto ditto Min. ditto ... ... ... ... 29.G16 



Mean daily range of the Barometer during the month ... ... 0.155 



o 



Mean Dry Bulb Thermometer for the month ... ... ... 84.3 



Max. Temperature occurred at 3 r. m. on the 31st ... ... 96.0 



Min. Temperature occurred at 8 & 11 p. m. on the 2nd ... ... 72.5 



Extreme range of the Temperature during the month ... ... 23.5 



Mean of tlie daily Max. Temperature ... ... ... ... 92.9 



Ditto ditto Min. ditto, ... ... ... ... 77.3 



Mean daily range of the Temperature during the month ... ... 15.6 



Mean "Wet Bulb Thermometer for the month ... ... ... 78.5 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 5.8 



Computed Mean Dew-point for the month ... ... ... 74.4 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 9.9 



Inches. 

 Mean Elastic force of Vapour for the month ... ... ... 0.838 



Troy grain. 

 Mean Weight of Vapour for the month ... ... ... 8.97 



Additional Weight of Vapour required for complete saturation ... 3.31 

 Mean degree of humidity for the month, complete saturation being unity 0.73 



o 

 Mean Max. Solar radiation Thermometer for the month ... ... 141.2 



Inches. 

 Eained 19 days,— Max. fall of rain during 24 hours ... ... 1.12 



Total amount of rain during the month ... ... ... 5.24 



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

 meter during the month ... ... ... ... ... 4.23 



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



* Height 70 feet 10 inches above ground. , 



