DelMonte, Guidubaldo
,
Mechanicorvm Liber
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<
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<
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">Sit vectis AB, cuius fulcimentum ſit A; qui
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bifariam diuidatur in D: ſitq; pondus C in D
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appenſum; duæq; ſint potentiæ æquales in BD
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pondus C ſuſtinentes. </
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<
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">Dico unamquamq; poten
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tiam in BD ponderis C ſubtriplam eſſe. </
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">Quoniam enim altera
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potentia eſt in D colloca
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ta, & pondus C in eodem
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puncto D eſt appenſum;
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potentia in D partem
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ponderis C ſuſtinebit ip
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ſi potentiæ D æqualem. </
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quare potentia in B partem ſuſtinebit reliquam, quæ pars dupla erit
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ipſius potentiæ in B; cùm pondus ad potentiam eandem habeat
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proportionem, quam AB ad AD: & potentiæ in BD ſunt æqua
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les; ergo potentia in B duplam ſuſtinebit partem eius, quam ſuſti
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net potentia in D. </
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<
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">diuidatur ergo pondus C in duas partes, qua
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rum vna ſit reliquæ dupla; quod fiet, ſi in tres partes æquales EFG
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diuiſerimus: tunc enim FG dupla erit ipſius E. </
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<
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">Itaq; potentia
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in D partem E ſuſtinebit, & potentiam in B reliquas FG. </
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<
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igitur inter ſe ſe æquales potentiæ in BD ſimul totum ſuſtinebunt
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pondus C. </
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">& quoniam potentia in D partem E ſuſtinet, quæ ter
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tia eſt pars ponderis C, ipſiq; eſt æqualis; erit potentia in D ſub
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tripla ponderis C. </
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<
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">& cùm potentia in B ſuſtineat partes FG, qua
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rum potentia in B eſt ſubdupla; erit in B potentia vni partium FG,
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putà G æqualis. </
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<
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">G verò tertia eſt pars ponderis C; potentia
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igitur in B ſubtripla erit ponderis C. </
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<
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">Vnaquæq; ergo potentia in
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BD ſubtripla eſt ponderis C. </
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<
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">quod demonſtrare oportebat. </
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