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# Title: Phoronomia, Sive De Viribus Et Motibus Corporum Solidorum Et Fluidorum Libri Duo (shelfmark Leibn. Marg. 182)
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Y94 DE V ERTBUS EF MIOTTBUS CORBORUM. LIB. II.
CF ad CC, erunt rires comprimentes seu elasticitates aeris ejusdem
densitatibus directe proportionales, ut a Mariotto, Amontonio e
Poleno pluribus experimentis comprobatum est. Vid. Mariocti Ten-
tamen de Natura Aeris, tum etiam Fractatus de Motu Aquarum,
in quibus ejusmodi experimenta à se capta distincte exponit, perin-
de ac post ipsum fecit Amontonius in Commentariis Acad. ScienE.
Paris. Sed quia communiter spacia CF, CCF, ecc. Perexigua Tune
in corundem menturis e proportionibus explorandis, Facile cst crro.
rem committere; idcirco Mariottus modo ilti proportiones inrecti.
sandi inter rires elasticas, seu rires comprimentes, et densitates ae
ris, merito alium adjecit ex oblerrationibus barometri petitum,
quem Jac. Bernoullius deinceps magis excoluit in luo Practatu de
Graritate Etheris. Ilic modus est indirectus, quia in eo aNumitur
id, quod est probandum instar principii, et conclusio contertur cum
Phaenomenis, cum quibus s conspirarerit retrogrado ordine conclu.
ditur principium assumtum eNe rerum. Nam Actulae barometri in
hoc altero experimentali modo infunditur Mercurius ad certum
signum usque, reliquo cubi aëri naturalis consistentiae relicto, non
vero, uc in communi baromerorum constructione Aeri Colet, TOrus
tubus hydrarorro impletur; dehinc inverlo tubo, obstructo ejus ori-
ficio, ex demisso intra superticiem Mercurii in rasculo quodam Aa8-
nantis, aperitur obscructum orificium, ut Mercurius in fctula ras-
culo perpendiculariter insistenti descendere queat, qui nOn tOtUIS
quidem ex tubo eAuet, Ped tamen humilius se in fictula demittet,
propter aërem fictulae introductum, quam in barometro ordinario;
Cx quo, quantum fieri potest, omnis aër dilisenter excludi Colet.
Jam si mercurius hac operatione polita, ad illud iplum signum de-
labitur, ex in co subsistit, in quo ipsum subsistere debere calculus
indicarit, qui in hypotheli fundatur, quod densitates sint riribus
comprimentibus proportionales, ccquis de bonitate hypotheleos
ambiset: Ouod rero Mercurius ad ca praecile ligna perreniat, quae
ipse calculus in hac memorata hypothesi Fundatus determinarit, id
constitit Mariotto ex Tac. Bernoullio ex obserrationibus accuratis.
Ouousque rero Nercurius in praememoratis circumstantiis se demit.
tere debeat, manifectabit seguens Problema.
PROIODCLIDMLMEI. LROBBEMA.
349. Datis atmosihaera pressione, e lonsitudine alieujus sistulae AB
aperta
F15. 85.