Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              extrinſeco ad aliam lineam determinato, & cum ipſo acquiſito, quando mu­
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              tat lineam perpendicularem deorſum, de quo infrà; ſi hunc igitur excipias,
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              omnes aly pugnant tantùm ratione diuerſæ lineæ, ſeu determinationis, in eodem
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              mobili:
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              Vnde ille idem, qui modo pugnat probè conueniet, ſi ad ean­
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              dem lineam determinetur. </s>
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              Scholium.
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              <s id="N157C8">Obſeruabis primò, præclarum naturæ inſtitutum, quo fit, vt impe­
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              tus perennis non ſit; vnde certè infinita propemodum emergerent ab­
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              ſurda, & incommoda. </s>
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              <s id="N157D2">Secundò, faciliorem modum deſtructionis impetus inſtitui non po­
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              tuiſſe, immò nec excogitari poſſe; quàm enim facilè, vel impetus op­
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              poſitus in mobili producitur, vel corpus durum opponitur &c. </s>
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              <s id="N157DC">Tertiò, præcipuam rationem huius deſtructionis ducendam eſſe ex
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              Ax.6. in quo dicimus nihil eſſe fruſtrà, cumque ordinem à natura eſſe
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              inſtitutum, vt potiùs aliquid deſtruatur, & deſinat eſſe, quàm fruſtrà ſit,
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              & dicimus deſtrui ad exigentiam totius naturæ. </s>
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              <s id="N157E7">Quartò, cum impetus ſuo fine caret, fruſtrà eſt; </s>
              <s id="N157EB">finis impetus eſt mo­
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              tus, vt ſæpè diximus, ſic cum globus impactus in alium æqualem ſtatim
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              ab ictu ſiſtit immobilis; </s>
              <s id="N157F3">certe ne fruſtrà ſit impetus, deſtruitur per Ax.6.
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              & per Ax. 14. num.2. cum verò determinatio altera maior eſt, certè præ­
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              ualet tantùm pro rata; </s>
              <s id="N157FB">igitur minor eſt motus; </s>
              <s id="N157FF">igitur, ne aliqui gradus
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              impetus ſint fruſtrà, deſtruuntur, cum verò ſunt duo impetus in eodem
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              mobili, vt in naui mobili ad lineas oppoſitas determinati; </s>
              <s id="N15807">haud dubiè
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              maior impetus præualet pro rata per Ax. 15. Igitur non modò totus
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              impetus minor perit, ne ſit fruſtrà; </s>
              <s id="N1580F">ſed etiam aliquot gradus maioris, ne
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              ſint etiam fruſtrà; nec enim in communem lineam coïre poſſunt. </s>
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              <s id="N15817">Denique quando ſunt duo impetus ad lineas diuerſas determinati,
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              ſed non oppoſitas ex diametro, pugnant pro diuerſo oppoſitionis gradu,
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              vt ſuprà fusè dictum eſt. </s>
              <s id="N1581E">Igitur cum totus impetus non habeat totum
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              motum, quod duplex illa determinatio impedit, ne aliqui gradus
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              ſint fruſtrà, deſtruuntur; </s>
              <s id="N15826">igitur vides impetum impreſſum ab ex­
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              trinſeco deſtrui tantùm ne ſit fruſtrà; faceret enim vt eſſet fruſtrà vel
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              nouus impetus, vel determinato noua, & in hoc ſenſu dicitur impetus
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              deſtrui ab impetu. </s>
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              <s id="N15832">Quintò, ſi deſtrueretur mobile, etiam deſtrueretur impetus per idem
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              Ax. 6. quia eſſet fruſtrà ſeparatum; </s>
              <s id="N15838">immò ex hoc vno principio demon­
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              ſtramus accidentia & formas ſubſtantiales materiales non poſſe natura­
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              liter conſeruari extra ſuum ſubiectum, quia ſcilicet eſſent fruſtrà; quip­
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              pe finem ſuum habent in ſubiecto. </s>
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              <s id="N15844">Sextò, Impetus naturalis innatus nunquam deſtruitur; </s>
              <s id="N15848">quia nunquam
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              eſt fruſtrà; quippe ſemper habet alterum ſuorum effectuum formalium,
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              id eſt vel motum deorſum, vel grauitationem, adde quod fruſtrà de­
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              ſtrueretur, cum ſit ſemper applicata potentia, id eſt ipſa grauitas, ſed de
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              his infrâ fusè. </s>
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