Weekly national intelligencer. [volume] (Washington [D.C.]) 1841-1869, 1851-08-16

What is there 10 isolate from that mass 80 - 70 induce 10
L separately violent gyrstion =
But Notwithstanding the failure Of the advocates Of me
hnd theory 10 assign any sdequats source OF gyrsoy
motion essential TO them, let be conceded that the wnng
notion requisite 10 hurricane has been communicated 70
Of ar Of between three hundred and Thousand miles
in diameter, and of an altitude not e1csedne .~o ME
would INQUIRE whether ii would be possible that such mass
nile travelling Is alleged the rate Of from twenty
,tv miles Der hour could revove about its axis when ie
o itself wthou, being retarded and dissPang It's mo-
among surrounding portions OF the atmosphere pre-
viously not participating in the wnirl .
Is any result of the Law Of motion more thoroughly 60
ahished both in theory and practice than that whring
motion il transformed into proiechle motion 10 ngnt hne
soop NJ il ceases be confined BY centnpeta orce OF
some reaction which, like that Of string equivalent
,;n,sJ force Il mol this law verified in the case OF
stone e, loose from sling, the fragments OF
4, rrindrone fractured during rapid rotation In tne case
Of fluids not the same law exemPhed BY the o.
the machine for winnowing grain, or Of the
rrsrhne now EMPLOYED a. bellows What then 70 70 pre-
vent the air in any whiriwind restrained BY centrPea
force from ying of ia every direction Is there any thing
which can prevent dissipation excepting the surrounding
Of air. But action and reaction are equal ana con-
ay, must not this zone be pressed outward, con-
FOCAL force which IL counserscs % that rapid
Of the gyra.ory momentum most ensue !.
We, this not as conceive, the sole cause OF
ture Il il well known that agreesbIy 70 properly nu
a. illustrated BY Venturt which has been
aesgnated as their lateral action, one portion OF nud
e.nno. be made to flow through another portion al resi- VIM
on, necessarily dividing it's force with the nsmens waicn
come 10 contact with B that the mass throughout WHICH
the momen,u is thus distributed increases necessarily %
noeeed. the totaiy Of the momentum recev-
nr no addition the velocity must lessen as the actuaed mass
Il is in consequence OF this property o. currents
that Of ghsH Sse S ta5s ss ne s., MI
exce the combustion Of coal fame. Tho pa.-lor;--
the greater adherence Of two disks me more
violent the effort separate them by blast through tube
sIoo The ovha pluf1nVp nf
syphon By blowing through associated be are evidently
reierabe to the property Of air under consideration
Agreeaby to an experiment Of Venur, Mcholons Jour
nal quar,o series, vol H. by currentof water projected
through vessel with sufficient veociyto mount the
side opposite to that at which it the vessel may be
partially empted Of that liquid But this power which
current has associate with il other pfons of the fluid in
which takes place DO great when there Is no unusual pres
sure how much active must be th growth OF the mass
acuaed when the current mpead AGAINST the PARTICLES
rest by centrifugal force Hence ISL not evident that
were tornadoes consist of masses OF air whng their
outside border they would grow large in diameter and be-
come less and less violent the longer heir Duration Yet
actually they retain nearly the same Dimensions and activity
for great part OF their course, AMI sometimes exercise
greater violence as they proceed
presume that the preceding queries can only be
swered a. to sanction the inference thu endug rotation
in of air cannot take place IN consequence of s tenn
pordry subsection any forces COMPETENT to make whii
however rapid the motion at the Quiet That there in
nature any forces capable Of travelling with whring plate
of ais the dimensions above portrayed assumed exist
within the precincts Of whwind stods Called has never
believe been advanced. The exsnce Of such forces
utterly inconcevsble and the Evidence adduced in the
Of ornadoes is reconcabe with their existence By
the author Of the theory against with contendng,
are informed that whrwnds and w4epouts appear to
mence graduay and to acquire he full activity without the
aid OF foreign cause and that is yel known that they
most frequent in those calm regions where apparently there
are no active currents to each he and the least
frequent where such currents abound
But may be urged that little thirlwinds are seem
10 evident that air may be made whr have already
said that no cause be assigned for the duration Of such
whili after escaping from the stationary eddy producing OBJ
sacles BY which they are generated unless ascbe II to
deficit Of pressure about the axis Of the notion causing cen
trPets force BY the effort Of the air restore the equilibrium
IN obed to the hydrostac influence Of gravity infer
that whenever any eddy producing obstacle any other
mechanical cause, has given rise to whr in fuid there
greater Or less deficiency Of pressure caused about the
axis BY the generating ores Hence the wh epdures for
short time after the cessation Of the mechanical force to
which owes its existence, at first directly and afer,cards
'ndrcc 10 consequence Of the deficit created about the
axis Thus there are two stages in the existence Of the pig
10y a ana 5 na @ rsss
which the accumulation thus made is expended Evidently
the sum OF the ce be exhausted the latter stage can
never exceed that applied in the former Now whsever may
be the velocity with which the generating forces are applied
il must follow that there il certain difference Of level or Of
PRESSURE which the cenrpeta force arising from the con-
sentative dydrosac influence Of gravity will become compe
couneract the disturbing centrifugal force and X is
10 clear that this equilibrium of forces take place as
soon as the uhir reaches its greatest velocity.
10 fact where storm is travelling, those under consd
GRAFTON represented to travel by the advocates Of the wh
wind theory, the gyrsons being PRODUCED q by collision
with any stationary body. island for instance the applca.
ton OF the cause Of gyraon be but transient the pro-
gresson Of the storm the stationary obstacle
to be left in It's But let il be admitted that there has
been application Of forces competent to make an aerial
mass revolve with any imaginable velocity, agreeaby the
view above presented the difference Of level OF Of density adj
equae compensate the centrifugal force cannot exceed that
which would result from single gyrs,ion with maximum
velocity Hence the secondary force which could sus
tain the wh after the aerial escapes from the in
uencs Of the Of gyaon, will exceed the force which
has derived from that cause which, il has already been OBJ
served, cannot beyond the power which one whir At
maximum velocity, il capable Of producing Precisely in
The only moving power suggested by Mr. Red6eid is
grarttanon conxected With Tie rotary and or
oudl monon q ne earth Admitting that these general
10 neonceyable that the subacen the ocean soud
not be similarly aecte ID incumbent upon the author
OF ldsa 20 snow nos the forces in question be
raed upon particular disk Of the atmosphere make
revove within the surrounding annulus of the
same medium Yet rotdfipe Increment in The arn r. ri.
legged BY him to be the only Of desucve winds and
sembesfs." srsa ne -.
For the generation Of this rotative movement the ahor
combines with the general forces above mentioned the tran
sient effect Of obsrcng bodies apparent the following
The northern margin parallels Of the
ing towards the guilt must NECESSARILY in collision vith
the archipelago Of ands which skirt Caribbean sea The
obstruction which they afford produces tendency to
These Of atmosphere thus set int, active revelation
continue sweep along the Islands with increased rapdy
Of Eyr.tien until they impnge upon the American coast
the Of his appropriations whirlw Winds will proceed 10
give smother in which be loses tight Of the planetary motions