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. </
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<
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>At verò torno poliuntur etiam metalla: nequaquam gem
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mæ, lapides, aut
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vitrũ
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: quòd hæc
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τμητα</
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ſint
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θζαυσὰ</
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: & non
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niſi in plures partes friantur. </
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Itaq;
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neq;
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aſciâ aut cultro ſecari
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valent: cùm ſectio in duo terminetur,
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unámq;
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particulam ab
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alijs avellat. </
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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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>Reſpondeo in torno eſſe motum velociorem; quo reſiſten
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tia & durities metallorum ſuperatur. </
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<
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>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. </
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<
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>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
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atq;
">atque</
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alius motus. </
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<
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>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. </
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<
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>Cùm verò hæc omnia ſint
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; erit illo
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rum diviſio
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ραῡς σ</
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non
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ις</
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. quia non una particula, ſed
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plures ſimul avelluntur: illæ nimirum, quæ impulſum
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motũq;
">motunque</
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recipiunt à plagâ, pro numero arenularum, non unâ. </
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<
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>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. </
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>
<
s
>Cùm igitur ſit
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σις ἀπὸ τη̄ς ἅψεως</
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, nequaquam altè penetrat; ſed mox à com
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preſſione & contactu impulſus cohibetur. </
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<
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>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. </
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