Star.
London, England, 1802-06-30 00:00:00

ONE lIITNZ MORNING.

I take the culla opportunity of informing you, that after a
very preafant journey, but the molt dangerous defeent I ever
made, on account of the bollterous weather, and the vicinity of,
the lea, we alighted at a dlftanee of four miles from this phce,
td fixty from itanelsgh. We remained only three quarters of
an hour on the road (in the air)t to-night I intend to be in
London with my balloon, which is all to pkees, as well as the
netting. We ourfeives are all over bindles, Ste.

The appearance of the balloon, we underhand,
excited the utmoll aitonilliment among the coun-
try people, and in Colcheller, where the Dredgers
were not a little afraid of its floundering among the
nyfter.beds, and aflonifhing the native:l as Rt. seta,
befor: he entered the car at Ranclagh,exaßed from
Capt. Sown/N his word of honour, that he would
not require to be landed till he (Garnerin) pleated.
GsaNearr deligned to go is far as he could, and
he was only flopped by his approach to the tea.
Captain Sow psi took the precaution of making
his will previous to the day of excurfion. He rub-
fcribed the fum of two hundred pounds towards
the expences of the day, for the privilege of being
his companion.
The diameter of this Balloon is about 2o feet;
in round numbers, the furface is about t aoo feet,
and the folid contentsrather more than 8000 cubic
feet. The inflammable air, or hydrogen gas, with
which it is dihended, is about thirteen times
lighter than atmofpheric air; a cubic foot of in-
flammable air weighs 411 grains, while the fame
bulk of atmofpheric air weighs 348 grains • the
whole volume of inflammable air in the balloon
would weigh 441 b. while the fame bulk of atmo-
fpheric air would be equal to 5621 b.
Suppofing the weight of the Balloon and Car to
be equal to one hundred weight, with an addition
of 4001 b. the balloon would be juft buoyant in at-
morpherie air; their fpeeific gravities would then be
exaßly equal. Ifin the Car there they'd be any
weight lets than 4001b.•the balloon will rife with
a velocity proportionate to this difference ; as it
.
riles in a fluid which. iliminithes in .denlity accor-
ding to the height, the balloon will become ha-
downy when floating in that medium where their
fpetitic parities are equal. To continue attending,
ballith is thrown Out ; the Balloon again rife: till
the fame equilibrium take: place. In order to de-
fcend, there is a valie, Which opens inwardly, and
which is opened by pulling a cord, and the Bal.
loon flnksin proportion to the quantity of gas let out.
When the Balloon has afcended about 1300 fa-
thoms, it has arrived at abeight which Sauss oil
calls the line of perpetual Snow& The thermometer
finks to 32 degrees. LtillalDl, in his excurfion,
found it as low as 29 degrees, viz. 3 degrees below
the freezing point. The velocity of the Balloon is
difficult to determine, the variation, at different
inhants, being fo confiderable. In attending, it
appears to move rapidly ; when arrived at its
maximum of the height, the motion mull be coin
paratively (mall. Lumen)* rote from the Artil-
lery-ground at five minutes after two, and arrived
at North hlimms at half pail three : he again risk,
and arrived at Stendon, near Ware. at twenty mi-
nines pall four; fo that the average velocity was
not more than twelve miles per hour.
The Eagle can fly in a minute 6ol,3Englilb
feet.—M. GAILMERIN'S balloon went at the rate of
649_1. A Hawk belonging to Henry the ad, King
of France. flew away from Fountainbleau, and
was- caught 24 hours after at the ifland of Malta.
In that time, therefore, this animal had travelled
icoo Englifh miles,which make about 42 miles
per hour, or 3696 eet per minute. At the rate
at which M. Gatti tures balloon proceeded, it
would go round the Globe in 134 Jays, allowing
the circumference of it to be 2400 miles, which
is double the velocity With vilhich Diamond and
Hambletonian run againfi each other, and with
about half the ftviftnefs of a carrier pigeon,on
one of which went, in the year 1779, from
Lon-
don to Tipton Church, in Staffordfhire, which is
1 to miles, in 53 minutes.
•
DISACULIia, and other writers on pneumatics,
have tined, that when the wind blows at the rate
of a mile in the minute, it is termed a hurricane,
or form; but the refult of this experiment is a
different conclufion. as the balloon, in afcending
and defcending, did not go fo quick as the windd
being heavier, though at the time it travelled in a
horizontal direction, it would move along as if it
bad been a component part of •the air, being ex-
', Rely of the fame fpecific gravity.
We need not he furprifed if the velocity of wind
never could be fairly afeertained till Balloons were
invented, as it was till then impoffible to accom-
pany any body carried along with the air in a di-
tea line, or to regulate the specific gravity of fuch
a body. and as all the nice and carefully made ex-
periments with the fails of windmills loaded, are
liable to the moh_egregious errors. By making
experiments on a Balloon, and a loaded fail, the
force of wind at a given velocity may be accurate-
ly determined. . Minus, though the impullive
force was as eafily meafured as it ever will be, yet
the menfuration of velocity being impracticable,
no conclufion could be drawn ; whereas, if one
fat of the experiments were once fairly made with
both at the fame time, the loaded fails will be
...or after 4.1041.101 mr.stsw4••• .•