Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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<
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176
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taculo D ſuſtineri intelligetur, ſed ſimul ab vtroque, ita
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vt dimidium, alterutri reſpondeat virtuti. </
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<
s
id
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N15395
">Quo fit vt cum
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potentia ad pondus attollendum, ipſa inferiori trochlea vti
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tur tanquam vecte non paruam virtutem ab ipſa trochlea
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mutuetur,
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abbr
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nõ
">non</
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ſecus ac à vecte, cuius alterum extremum fir
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miter alicubi ſit innixum, ad eleuandum pondus, quod ex
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eius medio pendeat, vt conſtare poteſt in deſcripto vecte
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ABC, cuius extre
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mum C fulciatur in
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D, extremum verò
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A ſit à
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abbr
="
potẽtia
">potentia</
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ele
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uandum, & ex pun
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cto medio B
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expan
abbr
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propẽ-deat
">propen
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deat</
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onus
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abbr
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alligatũ
">alligatum</
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,
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quod ſit ipſum E.
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</
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<
s
id
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N153CA
">Nam & ſi pondus
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potentiæ vires excederet,
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expan
abbr
="
duplamq.
">duplamque</
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>
ferè proportionem ha
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beret reſpectu earum, omnino tamen beneficio vectis tolle
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retur, cum dimidium tantùm illius ipſi potentiæ reſponde
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ret. </
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<
s
id
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">Quod ſi plures orbiculi in ipſa inferiori trochlea con
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tineantur, idem fiet, ac ſi totidem vectibus eiuſdem rationis
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idem pondus ab eadem potentia moueatur. </
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>
<
s
id
="
N153E0
">Nam cum ſin
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gulis pariter onus leuandum impartiri debeat, quò plures
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fuerint rotulæ ſicut vectes, eò minus potentiæ ad leuandum
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propria virtute relinquitur, ac propterea minor, ac minor
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virtus in trahente requiritur iuxta numerum rotularum. </
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<
s
id
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N153ED
">Cæterum in qua ſigillatim proportione ad multiplicatio
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nem ipſarum rotularum in inferioribus trochleis, augeatur
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virtus mouentis, vel pondus imminuatur, ſumendum eſt ex
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codem Guido Vbaldo, & alijs, qui hac de re ex profeſſo, ac
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fuſiùs tractant; cum ad explicationem, & confirmationem
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doctrinæ Ariſtotelis, ſufficiat oſtendiſſe, qua ratione, & via
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id poſſit contingere. </
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>
<
s
id
="
N153FC
">Et ſi quis multiplicatis trochleis, ſu
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culis, ac vectibus, vt hic idem Philoſophus ait, magna vide
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rit pondera eb exigua virtute moueri, aut eleuari, deſinat
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admirari. </
s
>
<
s
id
="
N15405
">Nam & ore tantum perflando vidi pondus tre-</
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