XCll 



Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, 



for the month of May, 1856. 



Monthly Eesults. 



Mean height of the Barometer, for the month, 

 Max. height of the Barometer, occurred at 8 A. M. on the 19th, 

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

 Extreme Range of the Barometer, during the month, 



Inches. 

 29.650 

 29.863 

 29.358 

 0.510 



Mean dry hulb Thermometer for the month, 

 Max. Temperature occurred at 2 P. m. on the 12th, 

 Min. Temperature, occurred at 10 p. m. on the 1st, 

 Extreme Range of the Temperature, during the month, 



o 



85.0 

 97.0 

 74.8 

 22.2 



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, 



Mean weight of vapour for the month, 



Additional weight of vapour required for complete saturation, 



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



79.6 



5.4 



76.9 



8.1 



Inches. 



0.908 



Troy grains, 



9.70 



2.83 



0.77 



Inches. 



1.96 



8.18 



Rained 12 days. Max. fall of rain during 24 hours, 



Total amount of Rain during the month, .. .. 



A very violent N. E. gale accompanied by much thundering, lightning and rain 

 and an incessant fall of hail stones occurred between 7 & 8 p. M. on the 14th. The 

 observations taken after 10 minutes intervals during the gale, are forthcoming at 

 the Surveyor General's Office. 



