Abstract of the Results of the Hourly Meteorological Observations taken at the Surveyor General's Office, Calcutta, in the

month of March 1866.

MONTHLY RESULTS.

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

Max. height of the Barometer occurred at 10 A. M. on the 12th,
Min. height of the Barometer occurred at 5 P. M. on the 22nd,
Extreme range of the Barometer during the month,
Mean of the daily Max. Pressures,

...

Mean daily range of the Barometer during the month,

...

Mean Dry Bulb Thermometer for the month,
Max. Temperature occurred at 4 P. M. on the 22nd,
Min. Temperature occurred at 7 A. M. on the 6th,
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 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.

75.1

...

8.8

68.9

...

15.0

Inches.

...

...

7.51

Mean Weight of Vapour for the month
Additional Weight of Vapour required for complete saturation, 4.62
Mean degree of humidity for the month, complete saturation being unity 0.62

Drizzled 2 days,-Max. fall of rain during 24 hours
Total amount of rain during the month,
Prevailing direction of the Wind,

Abstract of the Results of the Hourly Meteorological Observations taken at the Surveyor General's Office, Calcutta,

in the month of March 1866.

MONTHLY RESULTS.

Tables shewing the number of days on which at a given hour any particular wind blew, together with the number of days on which at the same hour, when any particular wind was blowing, it rained.

Abstract of the Results of the Hourly Meteorological Observations taken at the Surveyor General's Office, Calcutta,

in the month of April 1866.

Latitude 22° 33′ 1′′ North. Longitude 88° 20′ 34′′ East.

Height of the Cistern of the Standard Barometer above the sea level, 18-11 feet.

Daily Means, &c. of the Observations and of the Hygrometrical elements

dependent thereon.

The Mean Height of the Barometer, as likewise the Dry and Wet Bulb Thermometer Means are derived, from the hourly observations, made during the day.

Date.

Abstract of the Results of the Hourly Meteorological Observations taken at the Surveyor General's Office, Calcutta,

in the month of April 1866.

Daily Means, &c. of the Observations and of the Hygrometrical elements dependent thereon.-(Continued.)

All the Hygrometrical elements are computed by the Greenwich Constants.

Abstract of the Results of the Hourly Meteorological Observations taken at the Surveyor General's Office, Calcutta,

in the month of April 1866.

Hourly Means, &c. of the Observations and of the Hygrometrical elements dependent thereon.

The Mean Height of the Barometer, as likewise the Dry and Wet Bulb Thermometer Means are derived from the observations made at the several hours during the month..