Casati, Paolo
,
De igne dissertationes physicae
,
1686
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31 - 60
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91 - 120
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151 - 180
181 - 210
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241 - 270
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391 - 420
421 - 450
451 - 480
481 - 510
511 - 540
541 - 570
571 - 600
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Diſſertatio Decimatertia
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Nam Sapphirus fœmina, vt vocant, in igne, quicquid habet fuſci
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coloris, deponere dicitur, atque duritiem cum perſpicuitate con-
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iunctam acquirere adeò, vt Adamantem mentiatur: </
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<
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">id quod alij
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pręſtare ſe poſſe conſidunt, ſi quatuor horarum ſpatio Sapphirum in
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auro liquefacto detineant, cum illum, quaſi Adamantem, album
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educant. </
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<
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xml:space
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">A viro fide digniſſimo accepi, Topatium in crucibulo
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Aurichalci Scobe pleno, ſubiecto igne moderato, ad aliquot horas
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detentum, tandem ex illâ ſcobe erutum, aureo natiuo colore ſpo-
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liatum inuentum eſſe, & </
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<
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xml:space
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">quaſi Adamantem ſplendidè tranſparen-
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tem. </
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<
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xml:space
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">Chryſtallus autem ex rupe, fuſci obſcurique coloris, detenta
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ſub validis cineribus (cauendum tamen ne nimio calore ſcindatur)
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primùm poſt breue tempus indè educta reperitur leui aureo colore
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tincta, quaſi topatium ęmulata: </
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<
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xml:space
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">ſi verò ſub illis cineribus diutiùs
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detineatur, acquirit claritatem ſplendoremque pellucidum. </
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<
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Anſelmus Boëtius lib.</
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<
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Orientalem vſtione ita album fieri, vt vix periti gemmarij eum à ve-
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ro Adamante ſecernere valeant: </
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<
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xml:space
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">id quod profectò accidere nequit,
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niſi igne abſumente ſordes, hoc eſt, igniculis illas ſuo motu & </
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<
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tatione pulſantibus, concutientibus, atque demum abſtrahenti-
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bus, vtpote non adeò connexas, ſicut particulę ipſam gemmam
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componentes & </
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<
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xml:space
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">Contra verò Rubini granati tam
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firmo & </
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<
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">conſtanti colore ſunt referti, vt, adnotante eodem Boëtio,
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nullâ ignis violentiâ poſſit auferri: </
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">valido ſcilicet nexu particulę
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omnes colligantur, quem incurrentium igniculorum impetus labe-
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factare nequeat. </
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">Si autem ſaxa, quę in calcem excoquuntur, vt
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ſcribit Vitruuius lib.</
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">, *quo pondere conijciuntur in fornacem*,
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*cùm eximuntur, non poſſunt ad id re ſpondere, ſed, cum expendun-*
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*tur, eâdem magnitudine permanente, excocto liquore, circiter tertiâ*
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*parte ponderis imminuta inueniuntur*; </
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<
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">facilè perſuademur alia quo-
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que corpora igniculorum incurſionibus aliquas deperdere particu-
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las, licct ponderis imminutio non ſit manifeſta.</
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<
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">Sed etiam ipſe ignis ſuas inſerens particulas corpori, eius
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colorem mutare poteſt; </
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">ſicut multa ſunt, quę aqueo humore im-
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buta alium habent colorem, ac ſicca: </
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">id quod manifeſtum eſt in
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agrorum glebis, quæ arentes albeſcunt, poſt pluuiam nigræ appa-
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rent. </
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">Huius rei argumentum ſanè palmare ſuppeditat Glükradt in
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Notis ad Beguini lib.</
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