Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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              <s>
                <pb xlink:href="063/01/136.jpg"/>
              cellit: plumbum verò licet alijs metallis magis denſum; quia
                <lb/>
              tamen ob partes terreas minùs levigari poteſt, & colori atro
                <lb/>
              magis miſcetur; minùs reſplendet. </s>
              <s>Fieri ergo poteſt ut cor­
                <lb/>
              pus denſum, & ſi minùs politum, magis ſplendeat, quàm rarum,
                <lb/>
              & è contra: at ſummè levigatum neceſſariò ſuperat denſiſſi­
                <lb/>
              mum; ſi prorſus ſit impolitum. </s>
              <s>Deinde levigatum ſeu poli­
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              tum duobus modis ſumitur: abſolutè, & ſecundum quid. </s>
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              <s>Abſolutè quidem, cuius ſuperficies
                <expan abbr="undiq;">undique</expan>
              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
                <lb/>
              rum partibus ſcabris interciſas. </s>
              <s>Multa ergo licet ſuperficiem
                <lb/>
              habeant ſcabram & inæqualem; quia tamen eiuſmodi umbili­
                <lb/>
              cos continent leves & politos; reſplendent. </s>
              <s>Ita enim figulina
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              poliuntur: dum metallicus humot illitus,
                <expan abbr="atq;">atque</expan>
              igne liqueſcens
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              ſuperficiem inungit: & demum æqualiter concretus ſpeciem
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              vitri aſſumit. </s>
              <s>Similiter panis humido inunctus, cruſtam in igne
                <lb/>
              trahit reſplendentem. </s>
              <s>Ita atramentum ſcriptorium admiſto
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              gummi ſplendet. quia ob viſciditatem minùs ſorbetur humor:
                <lb/>
              & partes vitriolicæ ceu viſco cohærentes, inter ſiccandum mi­
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              nùs hiulcæ fiunt. </s>
              <s>Colores
                <expan abbr="quoq;">quoque</expan>
              & picturæ glutine pellucido
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              affuſo, aut permixto ſimili ratione reſplendent, </s>
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              <s>
                <emph type="italics"/>
              Sed dices. aquam eſſe ſummè levigatam, minùs tamen alijs ſplendere.
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              <s>Reſpondeo ſplendorem eſſe lucem à ſuperficie reflexam:
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              ut autem reflecti poſſit neceſſe priùs terminari. </s>
              <s>At verò aquam
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              pellucidam lux pertranſit: minùs ergo lucis à reflexione. </s>
              <s>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. </s>
              <s>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. </s>
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