'Transactions of the Bombay Geographical Society, from September 1850 to June 1852. Edited by the Secretary. Volume X.' [‎93] (114/458)

r. Master-General 1 !
^aged in surrey
died at fiveftfe
ty.
noisture contain
in relation to tli
er all over In^ !:
the eliang 6 of*
t Calcutta, Mafe
good observe
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.just named a*^
■hen deseed
before tbe Socifl?
WINTER RISE OF THE BAROMETER.
XCiil
Tables, showing the great February rise op the Barometer at Calcutta, Madras,
Aden, Bombay, and Kurrachee. —The figures on the left hand side of the table indicate the
days of the month—the columns for January and February are placed immediately
contiguous to each other. The columns of the readings commence in the former of these
months, when the mercury first begins steadily to rise, and is continued through the second,
till the wave has passed. The observations are all corrected for temperature and taken from
the records of the observations at the various places named—their accuracy may be depended
on. It is unfortunate that we have so few years of contemporaneous observation for the
purpose of comparison. So far as it appears, the maximum of the Barometer occurs all over
India at very.nearly the period of greatest cold, and when the air is dryest: the tables do not
enable us to tiace anything like a fluctuation from point to point. On all occasions, it will be
observed, the ascents and descents are both rapid, and the mercury having reached its highest
point, begins to fall again immediately. It not unfrequently happens that there are two of
these sudden jumps upward to nearly the same elevation, and at no great distance in point of'
time from each other. The publication of the Simla, Lucknow, Singapore, and Trevandrum,
and the continuation of the Madras observations will, most likely, furnish us with a large addi
tional amount of light->all, perhaps,*that may be required to establish the law, and commence >
the examination of its origin and cause. The following is an abstract of the Tables
Calcutta.
Madras.
Bombay.
Aden.
Kurkachee.
Sawunt
W arree.
]$41
21 Feb. 30*084
a a#. «a» •#»
a e » . • a » O
a aa eaa
1842
10 Feb. 30-033
9 Feb
30-028
• •• aa*. a a a
«a a O a a
18*3
25 .)an.. 30'077
23 Jau
30*153
24 Jan. 30-080
>0# 00« B.»
aaa
1844
17 Jan. 30-085
14 Feb
30*037
12 Jan. 30*032
••• ••• •a•
a • a
1845
11 Jan. 30-302
ll Jan
30*116
12 Jan. 30*055
• •• «a« aaa
aaa
•0» *00
1846.
•••. ••• •••
° • •
0 • a
6 Jan. 30 , l04
aaa aaa aaa
a a a
1847
5 Feb. 30*090
• •• a
• aa
i Jan. 30-017
8 Feb. 29*907
aaa
a a ® a • •
1848
8 Feb. 30*126
• a a
aaa ••• e.a
3 Feb. 29*961
aaa
••• aaa
1849
5 Feb. 30*089
• •• •
• aa
... ... ...
3 Feb. 29*978
aaa
aaa a a•
I860
4 Feb. 30*158
• a a • #
• • a
•aa •#• aaa
24 Feb. 29*871
aaa
aaa a ■ •
20 Feb. 29*675
1851
...'
21
Jan. 3 n -0't
...
••• aaa
In 1847, it will be observed, the barometer reached its maximum at Bombay on
the 5th February, at Calcutta, 16° to the east, on the 5th, and at Aden, 17 ° to
the west, on the 7th : were the fluctuations due to an atmospheric wave it would
almost seem as if this had originated near Bombay and the swell then progressed at an .*
almost equal rate on both sides. This is a particular case and this part of the law does
not extend to other years: in 1345, the barometer reached its maximum at Calcutta and
Madras on the 11th, and at Bombay on the 12th January, reaching, at the first named ,
of these places, the extraordinary elevation of 30*302, at the others 30*116 and 30*055-
respectively.
The tables, as just stated, are so exceedingly imperfect that they are hardly deserving of '
more minute analysis, and any law that might be deduced from them as they stand would
probably be invalidated or upset by a more extended observation : they are given prominently
to attract attention to the subject, and as illustrating the variable laws which guide the regular*-
Bmodical fluctuations ofoiir .atrao 3 phere i two or three of which alone are familiar fcu us.