Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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deſcripta circa axiculum C, nam ſi funis ex vtroque dia
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metri extremo à centro æquidiſtanti propendeat, & hinc
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pondus D, illinc potentia E æqualiter præmat, idem erit, ac
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ſi in libra æqualibus prædita
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brachijs æqualia pondera ap
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pendantur, quorum vnum, alte
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rum per proprium deſcenſum
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eleuare non poſſet, cum actio
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debeat eſſe ab inæquali propor
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tione, vt docet idem Ariſt. </
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<
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">Quare tota vis quæ adiungi
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tur potentiæ, pondus aliquod
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eleuanti prædictarum trochlea
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rum beneficio, petenda eſt ex
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trochlea inferiori. </
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<
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">Etenim cum
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alterum
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extremũ
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funis orbicu
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lo huius trochleæ circumdu
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cti, in ſuperiori ligno firmiter ſu
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ſpenſo ſit religatum; alterum
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verò à potentia ſuſtineatur, vel traha
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tur, pondus quod ex ipſius trochlea
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pendet, quaſi diuiſum, partim à ligno
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ſuperiori, ac partim à potentia trahen
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te ſuſtentatur, vt optimè demonſtrat
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Guidus Vbaldus propoſit. </
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in hac quæſt. </
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videreq.
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eſt in ſequenti
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figura. </
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<
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">Quoniam ſi trochlea ABC ſuſpen
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datur per funem eius orbiculo cir
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cumductum, cuius vnum
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extremũ
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ſit
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in D ſtabiliter alligatum, alterum verò
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à potentia in E conſtituta ſuſtineatur;
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ac pondus F ab ipſa inferiori parte
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trochleæ vbi B propendeat ſubliga
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tum, pondus ipſum
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totũ
">totum</
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, non quidem
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à ſola potentia E, nec à ſolo ſuſten</
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