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.-(Continued.)

All the Hygrometrical elements are computed by the Greenwich Constants.

tion being unity.

Abstract of the Results of the Hourly Meteorological Observations

taken at the Surveyor General's Office, Calcutta,

Ib

W. S. W. & E.S.E. 2.75

:

Overcast to Noon, i to 5 P. M., clear afterwards.

S. S. E. & W. S. W. 1.25 i to 7 A. M., scatd.

N. & N. N. W.

W. S. W.

W. S. W. &. S. S.W

i to 4

P. M., overcast to 8 P. M.\i

afterwards.

2.25 i to 3 P. M., overcast afterwards. Thin rain between 6

& 7 A. M. & at 8 & 10 P. M.

0.25 i to 5 A. M., i to Noon, clear afterwards.

Clear to 11 A. M., scatd. i to 5 P. M., clear afterwards. 2.25 Clear to 7 A. M., scatd. i to 7 P. M. clear afterwards, lightning to the S. E. at 10&11 P. M. 0.50 Clear scuds, from S. W. from 4 to 7 A. M, Foggy at 6 A. M. 0.25 Clear to 10 A. M. Scatd. ^i to 5 P. M., clear afterwards. Scuds from S. to N. to 9 a. M.

clear afterwards.

Scuds from S. W. to N. E. to

8 A. M. clear afterwards. Clear.

0.50 Clear. Foggy at 6 & 7 A. M. 0.50 Clear. Foggy from 5 to 7 a. M. 0.75 Clear.

13 145.5

S. & variable

14

15 148.4

S. S. W. & S. by E.

17 122.0

Clear to 3 A. M. Scatd. clouds to 8 A. M., clear afterwards. Clear to 9 A. M. Scuds from S. toN.to 3P.M.clear afterwards. Clear to 4 A. M. Scuds from S. to N. to 3 P. M. Overcast to 7 P. M. clear afterwards, lightning to the S. at 7 & 8 A. M., thin rain between 4 & 5 A. M. Clouds of different kinds. Clouds of different kinds to 6 P. M., clear afterwards. Lightning to the S. E. at 4 A. M. 1.80 Clouds of different kinds. Lightning to the E.

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

S. & S. S. E.

10.50

0.51

22 123.2

S. E. & variable

0.14 S. W. & N. N. W.

Overcast Lightning Thunder & rain at 10 & 11 P. M. Hails at 10 P. M.

2.00 Overcast to Noon \i & i afterwards, Lightning & Thunder at Midnight light rain at Midnight, 1 & from 4 to 6A.M. 2.80 i&i to 6 P. M. clear afterwards.Lightning toS.at 9P.M. Rain at 4 & 5 P. M.

E. S. E. & variable. 1.00 Overcast to 3 A. M. clear to 9

A. M. Scatd. i to 6 P. M. clear afterwards, Lightning to S.W

at 1 A. M.

1.00 Clear to 6 A. M. Scatd. i to 4
P. M. clear afterwards.
1.25 Clear to 1 P. M. i afterwards
Lightning to the W. & S. at

7 & 8 P. M. Thunder at 7 P. M. Light rain between 7 & 8 P. M. 1.00 i to A. M. Scuds from S. to 10 A. M. i to 4 P.M. clear afterwards.

2.75 Clear to 7 A. M. Scuds from S. to 10 A. M. Overcast afterwards Lightning to the E. from 6 to 9 P.M. Thunder at 5 & 6 P. M. rain at Noon, 5, 6 & 8 P. M. 2.00 Scatd. i to 5 A. M. \\__i & ^i to 1 P. M. overcast afterwards Lightning to the E. at 8 & 9

P. M. Thin rain at 6 P. M.

5.00 Scatd. i&i to 1 P. M. Scatd i to 5 P. M. overcast afterwards Lightning to the S. W. at 9 P. M. Thin rain at 10 & 11 P. M.

Ni Cirri, i Strati, i Cumuli,i Cirro-strati, i Cumulo strati,i Nimbi, i Cirro cumuli.

*Fell from 10 P. м. of the 21st to 6 A. M. of the 22nd.

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

month of April 1866.

MONTHLY RESULTS.

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

Max. height of the Barometer occurred at 9 A. M. on the 22nd,
Min. height of the Barometer occurred at 5 P. M. on the 11th,
Extreme range of the Barometer during the month,
Mean of the daily Max. Pressures,
Ditto ditto Min.

ditto

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 10th & 15th
Min. Temperature occurred at 1 & 3 A. M. on the 22nd
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.

Mean Elastic force of Vapour for the month,

76.9

...

7.2

71.9

12.2

8.28

Mean Weight of Vapour for the month
Additional Weight of Vapour required for complete saturation, 3.93
Mean degree of humidity for the month, complete saturation being unity 0.68

Rained 9 days,-Max. fall of rain during 24 hours
Total amount of rain during the month,

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

meter during the month.

Prevailing direction of the Wind,

which at the same hour, when any particular wind was

blowing, it rained.

- ICC

77777