Meteorological Observations.

xliii

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

in the month of June 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.

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

in the month of June 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.

Meteorological Observations.

xlv

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

4.25 Clouds of various kinds. Thin rain at 9. P. M.

S. S. W. & S.

S. S. E. & S.

2.00

Clear to 3 A. M. Scatd. \i to 5
P. M. i&i afterwards.

S. by E. & variable 3.00 i to 6 A. M. Thin clouds to 10

A. M. Clear to 5 P. M. Overcast afterwards. Lightning to N. E. at 8 & 9 P. M. Thunder at 8 P. M. Light rain at 10 & 11 P. M.

3.00 Overcast to 3 A. M. Scatd. i & i to 5 P. M. Overcast afterwards. Lightning at 8 & 10 P. M. Thunder at 10 P. M. Rain at 9 P. M.

23.00 Overcast to 4 A. M. Scatd. i & i to 5 P. M. Overcast after. wards. Rain from 7 to 9 P. M. 0.25 Scatd. \i to i to 10 A. M. i to 7 P. M. Overcast afterwards. Lightning to the N. at 8 P. M. 0.30 Overcast to 8 A. M. i to 7 P. M. Clear afterwards. Thunder at 3 P. M. Thin rain from 7 to 9 A. M. & at 3 P. M.

0.50 Clear to 4 A. M. i to 8 A. M. Scatd. i afterwards. Lightning to the N. E.at 9 & 10 P.M. 0.50 Overcast to 3 A. M. Scatd. ^i to 7P.M. Clear afterwards.Lightning to the N. at 1 A. M.

xlvi

Meteorological Observations.

Abstract of the Results of the Hourly Meteorological Observations taken at the Surveyor General's Office, Calcutta, in the month of June 1866.

Inches

15

0.38 E. S. E. & E.

0.80

16

0.18 S. E. & E. by S.

Clear to 4 A. M. i to 11 A. M.
Overcast afterwards. Thun-
der at 1 P. M. Rain at 6 & 9
A. M. & from 1 to 5 P. M.

0.80 Clear to 3 A. M. Overcast after-
wards. Thunder at 7 A. M. Rain
at 5, 6 & 7 A. M. & at 2 P. M.

0.53 SE&SSE & S by E 0.90 Overcast. Light rain from 2 to 9

A. M. & at 1 and 2 P. M. Lightning at 2, 3, & 4 A. M. Thunder at 2 & 11 A. M.

S.S.E.&S.S.W.&W. 0.50 \i & \i to 7 P. M. Overcast

0.23 W. & S. W.

W. S. W.

*

afterwards. Light rain atila.M.

0.40 Overcast. Light rain after inter

vals.

0.40 Overcast. Thin rain at 3 A. M. & from 7 to 11 P. M.

0.96 W. by S. &W.N.W. 0.60 Overcast. Light rain after inter

0.58 W. N. W. & S.

vals.

0.80 Overcast to 5 A. M. i & i to 1.P.M. Overcast to 7P. M. Clear afterwards. Rainat 3, 4&7 P. M. 0.80i to 3 A. M.Overcast to 11 A. M.

0.28 W. by S. & W.S.W.

25 117.0

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

0.80
0.40

i to 4 P. M. Overcast afterwards. Rain at 5 & from 8 to 11 P. M. Thunder & Lightning at 8 & 9 P. M.

Overcast nearly the whole day. Light rain from 6 to 11 A. M. Clear to 5 A. M. \i to 9A.M.~i to 3 P. M. Overcast afterwards. Slight rain between 2 & 3 P.M. 0.40i & hi to 6 P. M. Overcast afterwards. Slight rain at 3, 10, & 11 P. M.

0.64 W. S.W. & N.N.W. 1.25 Overcast rain at 1, 4, 5 & from

7 to 9 A. M. & at 8 P. M.

0.50 Overcast. Slight rain at 6, 10 &

11 A. M.

W. by S. & N. N.W. 0.50 i to 3 A. M. Overcast to 7 a. M. hi & i to 5 P. M. Overcast afterwards.

0.12 W. by N. & variable 0.50 Overcast to Noon.i, to 5 P. M. Thin clouds afterwards. Rain at 6 & 7 A. M.

-i Strati, i Cumuli,i Cirro-strati, i Cumulo strati,i Nimbi,

i Cirro cumuli.

*Fell from 7 P. M. of the 20th to 10 P. M. of the 21st.

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

month of June 1866.

MONTHLY RESULTS.

Inches.

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

29.518

Max. height of the Barometer occurred at 10 A. M. on the 2nd,

29.682

Min. height of the Barometer occurred at 4 P. M. on the 21st,
Extreme range of the Barometer during the month,
Mean of the daily Max. Pressures,

29.319

0.363

29.575

Ditto ditto Min.

ditto

Mean daily range of the Barometer during the month,

Mean Dry Bulb Thermometer for the month,
Max. Temperature occurred at 1 P. M. on the 8th

86.4

:

101.6

Min. Temperature occurred at 7 P. M. on the 10th

76.2

Extreme range of the Temperature during the month,
Mean of the daily Max. Temperature..

25.4

92.8

Ditto ditto Min.

ditto,

81.3

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

11.5

Mean Wet Bulb Thermometer for the month,
Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer,
Computed Mean Dew-point for the month,

81.4

5.0

77.9

Mean Dry Bulb Thermometer above computed mean Dew-point.

Mean Weight of Vapour for the month
Additional Weight of Vapour required for complete saturation, 3.08
Mean degree of humidity for the month, complete saturation being unity 0.76

Inches.

Rained 21 days,-Max. fall of rain during 24 hours

2.41

Total amount of rain during the month,

7.02

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

meter during the month.

6.25

Prevailing direction of the Wind,

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