DelMonte, Guidubaldo
,
Mechanicorvm Liber
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<
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">Sint duo vetes AB CD bifariam diuiſi in EF,
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quorum fulcimenta ſint AC, & pondus G in
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punctis EF vtriq; vecti ſit appenſum, ita vt ex
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vtroq; æqualiter ponderet; treſq; ſint potentiæ
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æquales in BDE pondus G ſuſtinentes. </
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vnamquamq; ſeorſum ex dictis potentiis ſub
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quintuplam eſſe ponderis G. </
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">Quoniam enim pondus G
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appenſum eſt in EF, & tres
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ſunt potentiæ in EBD æqua
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les; ideo potentia in E partem
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tantùm ponderis G ſuſtinebit
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ipſi potentiæ in E æqualem;
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potentiæ verò in BD partem
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ſuſtinebunt reliquam; & pars,
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quam ſuſtinet B, erit ipſius
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dupla; pars autem, quam ſu
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ſtinet D, erit ſimiliter ipſius D dupla; propter proportionem
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BA ad AE, & DC ad CF. </
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">Cùm itaq; potentiæ in BD ſint æqua
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les, erunt (ex iis, quæ ſupra dictum eſt) partes ponderis G, quæ
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à potentiis BD ſuſtinentur, inter ſe ſe æquales; & vnaquæq; du
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pla eius partis, quæ à potentia in E ſuſtinetur. </
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<
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">diuidatur er
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go pondus G in tres partes, quarum duæ ſint inter ſe ſe æquales,
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nec non vnaquæq; ſeorſum alterius tertiæ partis dupla. </
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<
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fiet, ſi in quinq; partes æquales HKLMN diuidatur; pars
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enim compoſita ex duabus partibus kL dupla eſt partis H; pars
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quoq; MN eiuſdem partis H eſt ſimiliter dupla. </
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<
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">quare & pars
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kL parti MN erit æqualis. </
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<
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">Suſtineat autem potentia in E par
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tem H; & potentia in B partes KL; potentia verò in D partes </
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