Meteorological Observations. 
Ixxi 
Abstract of the Results of the Hourly meteorological Observations 
taken at the Surveyor General's Office , Calcutta, 
in the month of January, 18G1. 
Monthly Results. 
Moan height of the Barometer for the month, 
Max. height of the Barometer, occurred at 9 A. M. on the 15th, 
Min. height of the Barometer, occurred at 6 p. M. on the 28th, 
Extreme range of the Barometer during the month, 
Moan of the Daily Max. Pressures, 
Ditto ditto Min. ditto, 
Mean daily range of the Barometer during the month, . . 
Inches. 
29.976 
30.157 
29.736 
0.421 
30.057 
29.918 
0.139 
Mean Dry Bulb Thermometer for the month, , . 
Max. Temperature occurred at 3 p. M. on the 28th, 
Min. Temperature occurred at 7 a. m. on the 26th, 
Extreme range of the Temperature during the month, . . 
Moan of the daily Max. Temperature, 
Ditto ditto Min. ditto, 
Mean daily range of the Temperature during the month, 
o 
68.1 
83.2 
52.7 
30.5 
77.7 
60.9 
16.8 
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,.. 
o 
61.8 
6.3 
58.0 
10.1 
Inches. 
0.4-89 
Troy grains. 
Mean Weight of Vapour for the month, .. .. g 
Additional Weight of Vapour required for complete saturation, . . 2.15 
Mean degree of humidity for the month, complete saturation being unity, 0.72 
Inches. 
0.56 
0.56 
N. & W. & S. 
Rained 4- days, Max. fall of rain during 2-1 hours, 
Total amount of rain during the month, 
Prevailing direction of the Wind, .. 
