Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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que ſcilicet vices gerendo atque exercendo:
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cor
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pus ſimul poſſit eſſe fulcimentum, & onus quod mouetur
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per vectem reſpectu diuerſorum, vt in ſimili ſupra explicui
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mus quæſt. </
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">3. Optime igitur ſecundum vtranque vectis ra
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tionem dicere poſſumus, cuneum virtutis incrementum ſu
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mere à duplici vecte, quam continet, & ab ictu percuſſionis,
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qua validius omni alio impulſu ipſe adhibetur. </
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vr ſi quiſpiam trochleas componens duas in
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ſignis duobus ad ſe inuicem iunctis contrario
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ad trochleas moto circulo funem circumdu
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xerit, cuius alterum quidem caput ſignorum
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appendatur alteri, alterum verò trochleis ſit
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innixum, & à funis initio trahere cœperit,
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magna trahit pondera, licet imbecillium fuerit virium? </
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quia idem pondus à minori potentia ſi mouetur, vecte medio
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transfertur magis, quàm à manu? </
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cti facit. </
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">Quamobrem ſi vna facilius trahet, & ab vnico
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tractu multò grauius trahet, quàm facere poſsit manus, idip
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sum duæ trochleæ plus quàm in dupla velocitate leuabunt.
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</
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">Minus enim altera trahit, quàm ſi ipſa per ſe ipſam trahe
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ret, quando circa alteram iniectus fuerit funis, illa namque
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minus etiam pondus effecit. </
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modo ſi ad plures iniectus
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fuerit funis in paucis trochleis, multa fit differentia, quamob
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rem à prima pondere quatuor minas trahente, ab vltima trahi
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multò minus. </
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">Et in re ędificatoria faciliter magna mouent
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pondera, traducunt enim ab una trochlea ad aliam, & rurſus
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ab illa ad ſuculas, & vectes. </
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">Hoc autem idem est, ac ſi mul
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tas facerent trochleas.
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<
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">COMMENTARIVS.</
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">Svppoſita deſcriptione trochleæ,
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multiplici di
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ſtinctione quam ſupra prima parte tex. 8. Additione
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prima tradidimus, illud in præſenti primò notandum </
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