Weekly national intelligencer. [volume] (Washington [D.C.]) 1841-1869, 1851-09-20

vspo which they hold must form cloud and at the sane
time render them lighter and warmer than the surround
ing air.
It first assumed by Espy that the rise Of temperature
tins caused would create buoyancy like that of balloon
and upward force and great an acce ration q, to
duce the phenomena OF tornado the foot Of the column
affected In fact, the buoyancy thus arising is BY this in
genous author considered universally the cause of storms
Admitting his estimate Of the buoyancy consoouent To
sncy thus created in - Of an ss,. ~ co JuOy
would any dsurhs& 1s column below that level
Count Rumiord first showed that may be boiled at
the top Of containing vessel without warming The liquid
lying below the part where the heat may be applied This
fact had been demonstrated by large scale during
each OF thirty courses OF lectures 10 Mr.. EPys presence
about five years ago. demonstrated that this law equally
true in the Of air.
large bell glass supported in inverted position
to allow the axis Of spirit lamp flame to be concentric
with the bore Of the neck In the next place. tu cotton
nearly equang in diameter the mouth Of the bell, mois-
tened with alcohol By of ongs this tuf being held
just above the mouth Of the boil, nHamed OF course
the difference of temperature thus created was ncompaAby
greater than any which could be poducbe by the latent hest
yielded by condensng vapor Moreover, the whole lifting
influence concentrated upon the comparatively narrow
area of the bore in the neck yet the smallest acceleraon
could be perceived take place. The fame in
the slightest degree disturbed. Subsequently at the meeting
of the association at Cambridge in S49 apparatus
constructed by which the experiment above described was
repeat d, with an improved arrangement.
Inside of the inverted bell the bore of the
neck Immediately whsh it rested, disk of wire gsuze
placed supporting few thin bres Of carded
About half inch above the mouth Of the bell another disk
tray Of wire gsuze upheld BY appropriate meshs on
which there put stratum Of carded cotton sufficiently
copious. These preparations being completed the cotton
above The bell gnted Notwithstanding the enormous
rise Of temperature thus produced n the upper part Of the
column Of a of which the lower portion occupied the bell
glass; entirely this lower portion uninfuenced that
there not the least pecepble agitation produced among
the most delicate flores Of the cotton.
Il is admitted that reaching the raried region where
the atmosphere clouds appear the consequent condensation
Of aqueous vapor will make any body Of air containing it
than would otherwise be- and from the lowest level
above which the heat applied there would be
disturbance in consequence Of the greater buoyancy Of the
column warmed by the condensation Of vapor But this dis
turbsnce would conceive, be much lees abrupt and for
chile than the Espian hypothesis of storms requires
Even after the condensation of aqueous vapor is effected
the which formed wlreman within the column, and
still add to its weight that the total weight will be d.
mnished. Moreover by swelling upwards it naturally
will do towards the region where there least resistance it
will become much taller rare and thus compensate by
its greater height for the loss Of specific gravity In nom
elastic fluid, any superiority Of elevation, any portion
banded than the rest would be rapidly compensated by
the overflow of the but in elastic ud where the
summit must be have scarcely any susceptible
weight, such active overflow take place would be
requisite produce any violent exchange Of position between
the column thus affected and the cylndera Of the
mosphere by which it is surrounded.