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

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              ita quidem ſe habet politura in lignis, & quæ his ſunt cogna­
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              ta. </s>
              <s>At verò torno poliuntur etiam metalla: nequaquam gem­
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              mæ, lapides, aut
                <expan abbr="vitrũ">vitrum</expan>
              : quòd hæc
                <foreign lang="grc">α
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                τμητα</foreign>
              ſint
                <foreign lang="grc">χα
                  <gap/>
                θζαυσὰ</foreign>
              : & non
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              niſi in plures partes friantur. </s>
              <s>
                <expan abbr="Itaq;">Itaque</expan>
                <expan abbr="neq;">neque</expan>
              aſciâ aut cultro ſecari
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              valent: cùm ſectio in duo terminetur,
                <expan abbr="unámq;">unámque</expan>
              particulam ab
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              alijs avellat. </s>
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              <s>
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              Sed cur metalla ab aſciâ non poliuntur, eandem vim cum torno ha­
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              bente?
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              <s>Reſpondeo in torno eſſe motum velociorem; quo reſiſten­
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              tia & durities metallorum ſuperatur. </s>
              <s>Idem enim eſt cùm tor­
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              no circumagitur mobile, quemadmodum ſi ferrum celerrimè
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              moveretur: ut cùm gemmæ orbiculis circumactis poliuntur. </s>
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              <s>Et licet illarum politura torno fieri videatur; ob motum cir­
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              cularem illorum orbiculorum, quibus gemmæ ſe affricantes
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              atteruntur: eſt tamen longè diverſus
                <expan abbr="atq;">atque</expan>
              alius motus. </s>
              <s>Non
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              enim orbiculi ſeu umbilici, quibus præpilantur cylindri ver­
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              ſatiles, incidunt: ſed arenulæ his intermixtæ: quo modo in a­
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              lijs orbiculis contingit horizonti parallelis. lutum enim arenu­
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              latum continuò affuſum ſuâ aſperitate radit ſuperficiem ma­
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              gis eminentem. </s>
              <s>Cùm verò hæc omnia ſint
                <foreign lang="grc">θζαυσα
                  <gap/>
                </foreign>
              ; erit illo­
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              rum diviſio
                <foreign lang="grc">θ
                  <gap/>
                ραῡς σ</foreign>
              non
                <foreign lang="grc">χάτα
                  <gap/>
                ις</foreign>
              . quia non una particula, ſed
                <lb/>
              plures ſimul avelluntur: illæ nimirum, quæ impulſum
                <expan abbr="motũq;">motunque</expan>
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              recipiunt à plagâ, pro numero arenularum, non unâ. </s>
              <s>Vide­
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              tur autem motus compoſitus ex inciſione & fracturâ: com­
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              preſſione quidem in profundum: tractu verò in latum agen­
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              te plagam, ab impulſu fluente inductam. </s>
              <s>Cùm igitur ſit
                <foreign lang="grc">χίνη­
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                σις ἀπὸ τη̄ς ἅψεως</foreign>
              , nequaquam altè penetrat; ſed mox à com­
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              preſſione & contactu impulſus cohibetur. </s>
              <s>Cui accedit humi­
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              ditas ex polline arenularum continuò affuſa gemmis, impul­
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              ſum hebetans: alioquin fragilibus, ſi arenulâ ſiccâ poliantur. </s>
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