Casati, Paolo
,
De igne dissertationes physicae
,
1686
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De ignis loco.
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lucratam fuiſſe ponderis grana ſex, ita tamen vt ſeptem ſcrupu-
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la & </
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<
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">amplius in calcem ſubcæſiam conuerſa fuerint. </
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<
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xml:space
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">Cum verò
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calcis illius (quod Plumbi & </
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<
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">extinctæ Flammæ aggregatum ipſe
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vocat) pondus in Aquâ examinaretur, deprehenſa eſt ſpecifica
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grauitas minor ſpecificâ grauitate Plumbi, cuius grauitas ad a que
<
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mole paris grauitatem eſt proximè vt 23 ad 2, ſubtilis verò huius
<
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Calcis grauitas inuenta eſt ſolùm vt 9 ad 1. </
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<
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xml:space
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">Ex quo manifeſtè de-
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prehenditur (ſi Calx ſit Metalli & </
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<
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">Ignis aggregatum) additum
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quidem fuiſle metallo aliquid, quod in aëre graue ſit, cum me-
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talli pondus augeatur, non tamen illud additamentum in metalli
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naturam tranſijſſe, cum ipſi metallo, vtpote leuius aquâ, de-
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trahat grauitatem. </
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<
s
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xml:space
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">Hanc verò ſpecificæ grauitatis mutationem
<
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in Calce plumbi obſeruatam, ſatis probabili coniecturâ exiſtima-
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re poſſumus contigiſſe etiam laminæ cupreæ, atque argenteæ, in
<
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quibus manifeſtus tumor apparuit. </
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>
<
s
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xml:space
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">Deinde adhuc incertum ma-
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net, vtrùm igniculi illi ſuapte naturâ grauiores ſint aëre iſto in-
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fimo, in quo viuimus, & </
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<
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">experimenta inſtituimus: </
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<
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">Quemadmo-
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dum enim aërem conſimili aëre neque grauiorem, neque leuiorem
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dicimus, fieri tamen poteſt, vt plurimus aër in locum vnum con-
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geſtus atque conſtipatus grauior fiat aëre non conſtipato, vt in
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follibus pugillatorijs videmus, quos etiam aëre hoc noſtro gra-
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uiores futuros exiſtimo, quamuis in altiſſimo monte inflati fuiſſent
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aëre tenuiſſimo & </
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<
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">leuiori, atque huc adducti: </
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>
<
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xml:space
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">Ita pariter quid
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prohibet igniculos ſuapte quidem naturâ leuiores aëre, aut certè
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non grauiores, eâ copiâ demum in metalli poros congeri, vt plu-
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rimum materiæ in anguſtiſſimo ſpatiolo collocatum exigat minùs
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abeſſe à centro grauium, quàm circunfluus aër minus habens ma-
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teriæ in mole pari? </
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>
<
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">Quapropter hiſce atque eiuſmodi experimen-
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tis ne plus æquo tribuatur, cauendum; </
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<
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">nec niſi meram coniectu-
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ram ex ijs capiendam cenſeo: </
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<
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xml:space
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">Noui enim, quàm multa ſint, quę
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nos fallunt probabilitate magnâ, vt aiebat Cicero in Academi-
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cis. </
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<
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">Sed neque ob quamlibet obiectam difficultatem reijcienda
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ſunt: </
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>
<
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xml:space
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">nam ſi nullo adhuc experimento didicimus ita poſſe aërem
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conſtipari, vt aquæ grauitatem ſuperet, non facilè admittendum
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congeſtos igniculos fieri aëre grauiores, ſi ſinguli ſint ſecundùm ſpe-
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ciem leuiores ipſo aëre.</
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<
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">Si nobis, qua methodo Plumbi calx intrà aquam ex-
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penſa fuerit, innoteſceret, fortaſſe lux aliqua maior affulgeret </
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