Casati, Paolo
,
De igne dissertationes physicae
,
1686
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Diſſertatio Tertia.
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maior: </
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">non quia aliquid graue additum illi fuerit, ſed quia ali-
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quid leue, videlicet lignum, demptum eſt, quod ſuâ leuitate
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in aquâ deterebat ferri grauitatem, quamuis in aëre facta ſit mi-
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nor grauitas dempto ligno, quod pariter in aëre eſt graue. </
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<
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">Quid
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ni, inquam, ſimile aliquid in allatis experimentis contingat? </
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<
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">Cum
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primùm ex venâ metallum ſeiunctum fuit, & </
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<
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">ope ignis ſolutum in
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maſſam frigore coaluit, intra poros plurimas ignis permiſti parti-
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culas concluſit, quas ſi dixerimus aëre leuiores, vtique metalli
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grauitatem imminuunt. </
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<
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xml:space
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">Iam verò ſi metallum igni iterum expo-
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natur, in eòque diutiùs ad aliquot horas detineatur, vi caloris ita
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recludi poſſunt intimi meatus, vt leuiſſimæ particulæ ibi iam du-
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dum concluſæ, & </
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<
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">raritatem maiorem affectantes, tandem auolare
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valeant, fiatque metalli maior ſecundùm ſpeciem grauitas, non
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quia graues aliquæ ignis particulæ additæ fuerint, ſed quia metal-
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lum particulas aëre leuiores amiſerit.</
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<
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<
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">Ingeniosè excogitatum: </
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<
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xml:space
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">an veritas prorſus congruat,
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non ſatis ſcio. </
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<
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">Si ex caloris vehementiâ metallicarum laminarum,
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aut ſcobis, aut calcis meatus recluduntur, & </
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<
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">ignei ſpiritus, quos,
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ſi cum aëre comparentur, leues dicis, indè auolant, quid in eo-
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rum locum ſuccedit? </
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">Nonne ſimiles igniculi? </
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">& </
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<
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">quidem maiore
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copiâ pro meatuum amplitudine maiore; </
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<
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">qui propterea, ſi aëre
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leuiores eſſent, multo magis metalli grauitatem imminuerent,
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quam tamen auctam obſeruamus. </
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<
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">Neque poſſumus igniculos om-
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nes extrudere, vt prorſus aër poros illos impleat; </
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<
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adhuc feruens materia bilancis examini ſubiecta eſt. </
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">Fatendum
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igitur igniculos in materiam metallicam irruentes (ſimile ponderis
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augmentum deprehenſum eſt in Coralij rubri fragminulis in vitreâ
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phialâ hermetico ſigillo obſtructâ clauſis, ſuper accenſos carbo-
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nes, ne vitrum labem faceret, per interualla collocatis) dum
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alij ab alijs vrgentur, ita demum intrà poros conſtipari, & </
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<
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">cum
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alijs particulis complicari, vt pro ſuâ mobilitate auolare ne-
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queant; </
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<
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xml:space
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">id quod aliquam temporis diuturnitatem exigit, vt expe-
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riendo didicimus.</
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<
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">Vt autem, quod res eſt, ſincerè eloquar, diſſimulandum non
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videtur, quid tandem ex huiuſcemodi experimentis in rem no-
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ſtram confici queat. </
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<
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xml:space
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">Et primum quidem ex poſtremo, quod Boy-
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le attulit *de Penetrabilitate vitri,* experimento habemus plum-
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bi v@@iam in vitreâ retortâ hermeticè ſigillatâ poſt duas </
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