Marci of Kronland, Johannes Marcus
,
De proportione motus figurarum recti linearum et circuli quadratura ex motu
,
1648
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cellit: plumbum verò licet alijs metallis magis denſum; quia
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tamen ob partes terreas minùs levigari poteſt, & colori atro
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magis miſcetur; minùs reſplendet. </
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<
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>Fieri ergo poteſt ut cor
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pus denſum, & ſi minùs politum, magis ſplendeat, quàm rarum,
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& è contra: at ſummè levigatum neceſſariò ſuperat denſiſſi
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mum; ſi prorſus ſit impolitum. </
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>Deinde levigatum ſeu poli
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tum duobus modis ſumitur: abſolutè, & ſecundum quid. </
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<
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>Abſolutè quidem, cuius ſuperficies
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eſt terſa & æqualis:
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ſecundùm quid autem, quod non totam ſuperficiem, ſed tan
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tum aliquas partes habet levigatas, non continuas inter ſe, ve
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rum partibus ſcabris interciſas. </
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<
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>Multa ergo licet ſuperficiem
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habeant ſcabram & inæqualem; quia tamen eiuſmodi umbili
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cos continent leves & politos; reſplendent. </
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>Ita enim figulina
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poliuntur: dum metallicus humot illitus,
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igne liqueſcens
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ſuperficiem inungit: & demum æqualiter concretus ſpeciem
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vitri aſſumit. </
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>Similiter panis humido inunctus, cruſtam in igne
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trahit reſplendentem. </
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<
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>Ita atramentum ſcriptorium admiſto
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gummi ſplendet. quia ob viſciditatem minùs ſorbetur humor:
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& partes vitriolicæ ceu viſco cohærentes, inter ſiccandum mi
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nùs hiulcæ fiunt. </
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>Colores
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& picturæ glutine pellucido
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affuſo, aut permixto ſimili ratione reſplendent, </
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Sed dices. aquam eſſe ſummè levigatam, minùs tamen alijs ſplendere.
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<
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>Reſpondeo ſplendorem eſſe lucem à ſuperficie reflexam:
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ut autem reflecti poſſit neceſſe priùs terminari. </
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>At verò aquam
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pellucidam lux pertranſit: minùs ergo lucis à reflexione. </
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<
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>De
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inde cùm aqua ſit fluens & minùs denſa corporibus ex eâ con
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cretis; minor copia lucis in eâ colligi poteſt. </
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<
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>Nec refert mul
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ta corpora eſſe rariora: hæc enim ſuam concretionem aëri de
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bent, qui in his prædominatur: cuiuſmodi volucrum pennæ,
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& ſambuci medulla. </
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