Marci of Kronland, Johannes Marcus
,
De proportione motus figurarum recti linearum et circuli quadratura ex motu
,
1648
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men illius partes pervadit. </
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<
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>In corpore autem vaſtæ molis,
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cuiuſmodi tellus, eò
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procedit, dum illâ extenuatione
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prorſus inſenſilis euadat: & cùm nulla eſt reciprocatio,
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vibratio contingit. </
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<
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>Tremere tamen interdum ſolum ex in
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genti plagâ conſtat: cùm partes vehementer preſſæ reaſſur
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gunt. </
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<
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>At verò
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una
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plaga ſe extendat, necdum
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liquet: conſtat ſanè longiſſimè protendi: in magnâ enim di
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ſtantiâ auribus terræ admotis ſonum etiam non magnum per
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cipiunt excubitores. </
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<
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>Eſt tamen magna differentia pro qua
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litate terræ: cavernoſa enim
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aëris continens ſo
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num longiùs protendit, quàm uliginoſa & paluſtris: & quæ
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continua eſt ac veluti concatenata, quàm ſabuloſa & interciſa. </
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<
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>Notandum Quartò, impulſum naturâ ſuâ lineam rectam &
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viam ſequi percutientis.
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itaq;
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ſi perpendiculariter incidat pla
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no motum ſeu impulſum producit in directum, ſi nihil obſtat. </
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<
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>At cùm reſiſtentia maior eſt ex unâ, quàm aliâ parte: ut cùm
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trabem longiorem percutimus non in centro gravitatis, ſed in
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parte uni extremo propiore: tum motus non fit in directum,
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ſed circularis: cuius centrum alterum extremum quieſcens,
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& à plagâ magis remotum. </
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<
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>Quòd ſi percuſſio fiat in centro:
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tametſi ad partes remotiores à plagâ minor impulſus ſe exten
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dat; quia tamen centrum gravitatis æquationem inducit;
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omnes æqualiter & in directum moventur. </
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<
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>In Sphærâ autem
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ſeu globo impetus à plagâ in centrum dirigitur, ſi moveri de
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beat: quod alioqui non eſt neceſſarium:
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enim pla
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ga ex obliquo illius partem decerpit. </
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<
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>At ſi globus alium
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percutiat
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ratione, neceſlariò hæc plaga centrum ſpe
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ctat. propterea, quòd
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utrumq;
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centrum
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atq;
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illorum plaga ſit in
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eadem lineâ rectâ. </
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<
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>Nulla tamen plaga ex obliquo facta </
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