Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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per diametrem quadranguli A B C D, quæ eſt recta A D;
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ſiquidem in nulla alia parte interiecti ſpatij, diſtantia eſſet
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æqualis, vt ſenſu conſtat: Ergo ſeruata eadem proportione in
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ipſa duplici latione reſpectu mobilis & cuiuſque partis ipſius,
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motus neceſſariò erit rectus, ſeu
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& quælibet eius pars,
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non niſi per rectam lineam poterit moueri. </
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<
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<
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">Deinde quod infert Ariſtoteles, circulare eſſe id quod ſe
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cundum nullam proportionem, nullo in tempore duas pati
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tur lationes, falſum eſſet etiam iuxta præfatam explicationé
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proportionis; niſi per circulare intelligeremus lato modo, id
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quod eſt curuum. </
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">quia nimirum non ſequitur, aliquid eſſe
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circulare, in rigore loquendo, aut moueri per lineam circula
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rem, eo quòd moueri non poſſit per lineam rectam; cum plu
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res ſint figuræ ac lineæ non rectæ, nec circulares, vt figura el
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lipſis, ſectiones parabolicæ, ac lineæ ſpirales,
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abbr
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aliæq.
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irregu
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lares permultæ. </
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<
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">Quæ omnia prænotaſſe, ipſa verborum am
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biguitas poſtulabat, vt clarius ad probationem doctrinæ pro
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cederemus. </
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<
s
id
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">Iam vero vt Geometricis principijs quæ dicta ſunt pateát,
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ſic probat Ariſtoteles, quidquid fertur duabus lationibus ad
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inuicem proportionatis, ſuper rectam neceſſariò ferri, ac pro
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inde non circulariter. </
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<
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">Sit inquit proportio ipſarum lationum
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quam habent inter
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ſe latera A B & AC
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in dato rectangulo
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A B C D. </
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">Et A
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duplici motu
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feratur, vno quo
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tẽdat
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verſus B, qua
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ſi ex ſe incedendo
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ſuper lineam A B:
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altero verò, quo ſimul cum ipſa linea A B ſubterferatur ver
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ſus C, ſeu verſus lineam C D cum eadem ſemper proportio
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ne. </
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<
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id
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">Tunc dicimus punctum A motu ipſo mixto, neceſſariò
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ferri per rectam A D, quæ eſt diameter eiuſdem quadrilateri
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A B C D. </
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<
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cõſtituatur
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rectangulus minor A E F G </
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