Casati, Paolo
,
De igne dissertationes physicae
,
1686
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De ignis loco.
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res, ſed æqualis grauitatis cum toto cylindro ligneo: </
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<
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xml:space
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">ergo non eſt
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æqualis preſſio in *ab*, atque in *io*, cum tamen fiat conſiſtentia
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tum liquoris, tum ligni. </
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<
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">Ex quo non obſcurè arguitur, nullam
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eſſe preſſionem aëris ſupra aquam. </
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<
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xml:space
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">Quod verò narrant in Galliâ
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obſeruatum de vtre ad radicem altiſſimi montis languido, in ſum-
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mo autem iugi vertice diſtento, & </
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<
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xml:space
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">iterum flacceſcente, cum in
<
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vallem reportaretur. </
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<
s
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xml:space
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">quaſi incluſus aër deueniens in ſuperiorem
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locum, vbi à breuiore & </
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<
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xml:space
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">minùs graui aëris cylindro premeretur, vi
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ſuâ elaſticâ ſe ipſe expanderet, reductus autem ad infimum locum
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magis premeretur: </
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<
s
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">Non me admodum facilem habet ad aſſentien-
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dum: </
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<
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xml:space
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">niſi fortè vter in aſcenſu Solis radijs percuſſus incaluit, & </
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<
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erumpentes ex corpore defatigati in motu hominis illum deferen-
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tis ſubferuidos halitus concepit, vnde & </
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<
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xml:space
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">raritatem aſſumpſerit
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incluſus aër, quam poſtea depoſuerit ad veſperum, & </
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>
<
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xml:space
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">in vallis
<
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vmbrâ, iterum concreſcens vi frigoris. </
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>
<
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xml:id
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xml:space
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preserve
">Subuereor autem, neid
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excogitatum fuerit ex pręconceptâ opinione elateris, ob quan-
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dam analogiam cum veſiculâ flaccidâ, quæ in Machinâ Boylæâ,
<
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cum exhauriretur aër, intumeſcebat: </
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<
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xml:space
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">ibi quippe rareſcens aër
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vndequaque membranam veſicæ attrahebat, & </
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<
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xml:id
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xml:space
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">incluſum in ve-
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ſicâ aërem diſtrahebat; </
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>
<
s
xml:id
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xml:space
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preserve
">qui rurſum ſe contrahebat, atque veſica
<
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detumeſcebat, cum, nouo aëre in Machinam admiſſo, vis ceſſa-
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bat attrahens circumflui aëris ad priſtinum ſtatum ſe reſtituentis.
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</
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>
<
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xml:id
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xml:space
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">At in libero aëre nihil huiuſmodi contingit. </
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>
<
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xml:id
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xml:space
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">Certè tam multos
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vtres oleo repletos, & </
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<
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">nonnihil aëris habentes ex Liguriâ in Gal-
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liam Ciſalpinam quaſi perpetuò deuehi nouimus, & </
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<
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xml:space
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">nullum in-
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flationis veſtigium apparuit in ſummorum montium tranſitu: </
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>
<
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xml:space
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">niſi
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fortè hos nimis humiles dicas. </
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>
<
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xml:space
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">An in vitreâ philâ, cuius oſculo
<
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obducta ſit membrana, ſi in altiſſimum montem transferatur, in-
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cluſus aër exercet vim elaſticam ita, vt membranam magis di-
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ſtendat? </
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>
<
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xml:id
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xml:space
="
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">modo abſit vis caloris rarum illum facientis. </
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>
<
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xml:space
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">Sed, vt ali-
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quid narrantium authoritati tribuamus, haud dubium quin mo-
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tui medium propellendum reſiſtat pro ſua denſitate, quancunque
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in partem vrgeatur, etſi non aduerſetur illius grauitas, cùm mo-
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tus non fit ſurſum, ſed ad latera: </
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<
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xml:space
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">ſic aqua magis reſiſtit quàm
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aër, mel magis quàm aqua: </
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">Igitur & </
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<
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">aër craſſior magis reſiſtit,
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quàm rarus. </
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>
<
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xml:space
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">Sicutitaque, cùm in vtrem aut veſicam ingeritur
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aër, reſiſteret mel aut aqua, ne veſicæ latera adeò diſtenderen-
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tur, ac propterea incluſus aër aliquam pateretur </
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