Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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              <s id="s.000293">
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              rantes ſibi mutuò impellunt, & proindè vna alterius
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              vim, & actionem deſtruit, quantum ergo lamina in­
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              flectitur deorsùm à
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              C, tantumdèm ſursùm re­
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              flectitur à contrario impulſu ipſius H.
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              Cap. 3. flui­
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              dum in ſuo
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              toto quie­
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              ſcens pon­
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              derat.</s>
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              PROP. XXVII.
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              Idipſum adhibitis contrarijs ponderibus ope libræ
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              verificatur.
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                <emph.end type="center"/>
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              <s id="s.000296">APplicetur libra DE radio­
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              rum æqualium ſuffultą
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              in F, it aut terminus D infrà ex­
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              tremitatem laminæ AB collo­
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              cetur, & tunc poſito pondere
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              G æquale ipſi C in altero extremo libræ E, impel­
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              letur ſursùm terminus libræ, vel vectis D à vi pon­
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              deris G, & ab illo lamina AB in directum retine­
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              bitur contra vim compreſſiuam ponderis C,
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                quidem</expan>
              duo pondera C, & G inter ſe æqualia ſe mu­
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              tuò impellunt, proindeque lamina intercepta AB,
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              neque deorsùm, neque ſursùm flectetur. </s>
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              <s id="s.000297">
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              PROP. XXVIII.
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              <s id="s.000298">
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              Idipſum alia ratione vſurpata libra demonſtratur.
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              <s id="s.000299">SI nimirùm termino E im­
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              ponatur pondus IG du­
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              plum ipſius C, atque in D ap­
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              plicetur pondus M æqualę
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              eidem C,
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              eſt, quòd
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              pondus IG æquale eſt duo-</s>
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