, 1875-09-15

site point, with a corresponding degree of
violence with that which preceded it.
9Th. If a hurricane should begin from the
north east it will gradually veer round to the
east and south east, after which it will cease.
Should it begin from the north west it will
veer round to the west, and will then subside.
In either of these cases it will probably be
less violent than if it commenced from tbs
north. Observing the particulars herein men
toned, you may be guided ia the manner of
making your building secure if pressed for
time.
9th. IF a hurricane should begin FROM the
east or from the west, it will probably be
4" moderate and of short Duration
9TH. If you have a Barometer observe it
carefully during a hurricane. AS soon as the
surface Of the mercury should have become
convex, or rounded upwards, you may be sure
the work of the gale is over; and you may
expect in a short time its violence will 4bate.
Bat no such change will take place on the
surface of the column of the mercury before
the lull which intervenes under the circum.
stances mentioned in the 4th remark. In the
state of delusive tranquility there referred to
the mercury will not rise il the slightest
degree.
8th. If you have not a Barometer procure
one without delay.
The following are the extracts
from Major Lang's Remarks.
This proper height of the quicksilver in the
Barometer at the level of the sea can be consid-
cred as 80 inches English.
In common weather, there are in the "a hours
4 regular oscillations in its height, varying in
these ATTITUDES from 6-l0,hs to 6-10ths of line,
as follows:
At 10 o'clock in the forenoon the quicksilver is
at it's highest state at 4 O'Clock in the afternoon
it is at its lowest, being froml6-10ths 70 S-10ths
Of a line lower than at 10 o'clock in tbs fore
noon by 10 O'Clock at night it will have re-
gained its former height of 10 in the forenoon
and hy Z o'clock in the morning, it will have
descended to it's lowest state, to return by 10
o'clock in the forenoon to its highest state for
that day, and this with CONSTANT regularity
Hurricanes, Pamperos, excepted.
This has long been noticed, bat its cause l
believe remains as yet a mystery. l have fire..
ouently attempted to find some clue to unfold
the cause, but all to no purpose. The Sun, l
conceive, Is the principal agent"
During the year Excepting in the hurricane
season that highest state will rarely deVlate
one line from its mean state, and in the hurri-
cane season, if it should even deviate two lines
lower, but the oscillations regularly going on,
I feel no alarm but, if after 4 o'clock, either
II the morning or afternoon, the mercury in
"place'Of rising continues to fall, there IS then
every reason for suspicion.
The absolute height of the mercUry in these
ATTITUDES is of Importance. l have never
noticed the mercury to stand three lines below
its standard, without its being followed by or
accompanied with a Cyclone, or Pampero with
a delugo.
2. The remarks on the Barometer in this
paragraph are excellent.
3 In this | entirely agree, but will extend
this further in 4.
4. The common direction of progression of a
Hurricane in these latitudes, say from Barbados
to Porto Rico, may be considered from E.S.E.
to w. N. w. true the variation of the compass
is small at st. Croix Il g.. Now at this
Island, if the actual storm begins at N. N. b..
l feel convinced we will be exposed to all its
fury there will be little OF no change in the
direction of the wind until tho nucleus APP
proaehes, when that solemn lull, that delusiVe
tranquility" takes place, to be succeeded by a
terrific burst from S.. S. w, at which it will
continue till the meteor passes.
We will now suppose the Storm to begin at
N. N. w. l would feel as sure, as if it had
already occurred, that the nucleus of the storm
would pass to the N. N. E. Of my position
and that / would be involved in the Southern
semi-cirole of the Cyclone, experiencing a good
deal Of its violence, the wind shifting to N. w,
W, and S.. w, which would be the direction OF
the wind at the meteor's leaving me.
We will now suppose the storm to begin at
N. E. bv E. I would then feel sure that the