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This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1810 Excerpt: ...of inflammable air, de-of b.die- termining it to
be at least seven times lighter than rising in the common air. Soon
after which, it occurred to Dr13' Black, that perhaps a thin bag
filled with inflammable jjiack air might be buoyed up by the common
atmosphere; MrCavailo. and he thought of having the allantoisof a
calf prepared for this purpose: but his other avocations prevented
him from prolecuting the experiment. The fame thought occurred some
years afterwards to Mr Cavallo; and he has the honour of being the
first who made experiments on the subject. He lirfl tried bladders;
but the thinnest of these, however well scraped and prepared, were
found too heavy. He then tried Chinese paper; but that proved so
permeable, that the vapour passed through it like water through a
sieve. His experiments, therefore, made in the year 1782, proceed1
ed As..station discovered by Mons. Montgolfier. ed no fnrthrr
tbitiu blowing up soap-bubbles with in-flammable air, which
ascended rapidly to the ceiling, 7 and broke against it. But while
the discovery os the art of aerostation seemed thus on the point of
being made in Britain, it was all at once announced in France, and
that from a quarter whrrce nothing of the kind was to have been and
finely decorated, expected. Two brothers, Stephen and John
Mont-golfier, natives of Annonay, and mailers of a consider-able
pEp.T-manuf.'.ctory there, had turned their thoughts towards this
project as early as the middle of the year 1782. The idea was iiril
suggested by the natural ascent of the smoke and clouds in the
atmosphere; and their design was to form an artificial cloud, by
inclosing the smoke in a bag, and making it carry up the cover-ing
al ng with it-.Towards the middle of Novt-mber 8 that year, the
experiment was made at...
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