Meteorological Observations. xxxi 



Abstract of tlie Results of the Hourly Meteorological Observations 

 'taken at the Surveyor General's Ojjice, Calcutta, 

 in the month of April, 18G5. 



MOKTHLT EeSTTLTS. 



Inches 



Mean height of the Barometer for the month, .. .. .. 29.795 



Mai. height of the Barometer occurred at 10 a. m. on the 13th, .. 29.985 



Min. height of the Barometer occurred at 5 p. m. on the 29th, ,. 29.526 



Extreme range of the Barometer during the month, .. .. 0.459 



Mean of the Daily Max. Pressures, .. .. .. .. 29.871 



Ditto ditto Min. ditto, .. .. .. .. 29.717 



Mean daily range of the Barometer during the month, .. .. 0.154 



Mean Dry Bulb Thermometer for the month, .. .. .. 84.5 



Max. Temperature occurred at 3 p. M. on the 4th, .. .. 98.2 



Min. Temperature occurred at 6 a. m. on the 5th, .. .. 72.4 



Extreme range of the Temperature during the month, . . . . 25.8 



Mean of the daily Max. Temperature, .. .. .. 93.5 



Ditto ditto Min. ditto, .. .. .. .. 77.8 



Mean daily range of the Temperature during the month, .. .. 15.7 



Mean Wet Bulb Thermometer for the month, .. .. .. 77.7 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, .. 6,8 



Computed Mean Dew-point for the month, .. .. .. 72.9 



Mean Dry Bulb Thermometer above computed Mean Dew-point, .. 11.6 



Inches 

 Mean Elastic force of Vapour for the month, .. .. .. 0.797 



Troy grains 

 Mean Weight of Vapour for the month, .. .. .. g.52 



Additional Weight of Vapour required for complete saturation, .. 3.83 



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



Inches 

 Eained 8 days, Max. fall of rain during 24 hours, .. .. 1,67 



Total amount of rain during the month, .. ,. ., 4,28 



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



