Casati, Paolo
,
De igne dissertationes physicae
,
1686
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De his quæ Virtute Calida dicuntur.
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eruperit. </
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<
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xml:space
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">Mihi verò nihil negotij faceſſit, quod tenuiſſimæ ſint in
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ſilice, & </
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<
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xml:space
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">in ferro, illæ anguſtiæ, ſcintillæ autem tot & </
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<
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">tantę ap-
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pareant, vt videantur, non potuiſſe tantillo ſpatio comprehen-
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di: </
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<
s
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xml:space
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">propterea enim tantâ velocitate exiliunt, quia ibi per vim
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congeſti detinebantur igniculi, qui libertatem nacti dum ſe celer-
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rimè agitant, maiorem ſui ſpeciem noſtris oculis ingerunt; </
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<
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">quem-
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admodum titio ſi velociter moueatur, modò rectam regulam igni-
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tam, modò circularem, modò ellipticam zonam ſui ſpecie in oculo
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æmulatur, prout rectâ, aut in orbem mouetur.</
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<
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">Maur. </
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">Aptiſſimâ argumentatione, in re cœteroqui per ſe ſatis
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perſpicuâ, vſus mihi videris, Gradonice, ad ſtatuendos inquili-
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nos in ſilice & </
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<
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">in chalybe igniculos, antequam ex colliſione erum-
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pant: </
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<
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xml:space
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">dum enim gigneretur lapis, & </
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">potiſſimùm ex Sale, Terra, & </
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Sulphure, congruo humore atque ſpiritu permiſtis, concreſceret,
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particulæ aliquæ ſulphureæ, quaſi illius permiſtionis reliquiæ, in-
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tercluſæ auolare nequinerunt; </
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<
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xml:space
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">ibique tandiu concluſæ detinentur,
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quàm effracto ex colliſione repagulo proſilire valeant. </
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<
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xml:space
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">In chalybe
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quoquè, quia candens ferrum igne imbutum non ſponte ſuâ re-
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frigeſcere permittitur, vt, qua viâ ingreſſi ſunt, eâdem euadant
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igniculi, ſed in aquâ extinguitur, ideò illi ſe ad interiora reci-
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pientes confertim in cauernulis conſtipantur, vnde & </
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<
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">diffractæ
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chalybeæ laminæ granoſæ apparent. </
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<
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xml:space
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">Hi tamen igniculi in poris la-
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titantes atque incluſi, qui ſolâ percuſſione eliciuntur, non ſatis
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eſſe videntur, vt ſilex & </
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<
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">chalybs Virtute calidi dicantur: </
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dem cum Galeno Medici non ignobiles ferrum inter frigida & </
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ca recenſent. </
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<
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">Quod ſi ferrum in eorum, quæ Virtute calida ſunt,
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numerum referre malueris, cum calidam temperationem indicare
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videatur facultas, qua ſuperfluos ventriculi humores abſumit, & </
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contumaces obſtructiones reſerat, id tribuendum erit non ſcintil-
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lis, quæ nullæ ſunt in minutiſſimâ ſcobe chalybis, ſed particulis
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ſulphureis, quibus ferri natura conſtat ita ex artis præcepto præ-
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paratis, vt animalis calor illas excitare valeat, & </
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<
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motum. </
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<
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">Sulphur autem ferro ineſſe deprehendet, qui Aquam
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Fortem, aut Spiritum Vitrioli ſcobi ferri affuderit, materia enim
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incaleſcet, aut etiam flammam concipiet graueolentem; </
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<
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">cuius
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odoris cauſa non niſi ſulphuri adſcribenda eſt. </
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<
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">Sulphur verò cum
<
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particulis ſalinis (cuiuſmodi reperiuntur in Aquâ Forti, & </
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<
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xml:space
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">in Spi-
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ritu Vitrioli) commiſtum acuitur, & </
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