Biancani, Giuseppe
,
Aristotelis loca mathematica
,
1615
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178
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potentia cum altero communis eſt in latere A B, à malleo validè percuſſo.
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<
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">cunei igitur virtus partim ex vectibus, partim ex percuſſione conſtat.</
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QVÆSTIO XVIII.
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De Trochlea.
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257</
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<
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">Hvius quæſtionis ſenſus, ac verba optimè intelligentur ex ſequen
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tibus. </
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">Trochlea, vt patet ex ſuperioribus Ariſt. eſt orbiculus in
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periphæria ſtriatus, vna cum toto loculumento, cui inſeritur:
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cuius imaginem ad 8. quæſt. </
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">Apud Architectores verò
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trochlea conſtat ſaltem ex duobus prædictis loculamentis, in quibus ſunt
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orbiculi; & vnus orbiculus eſt ſupernè collocatus, alter verò infernè, vt pa
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tebit in ſequenti figuratione: quod
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inſtrumentũ
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nunc vulgò dicitur Taglia,
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à nonnullis dicitur etiam Rechamo. </
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">Auxilio huius inſtrumenti machinato
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res parua vi attollunt ingentia pondera. </
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<
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id
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">communiter autem conſtat ex plu
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ribus orbiculis, qui partim ſuperiori loculamento,
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partim inferiori inditi ſunt, per quos orbiculos cer
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ta lege circumductus eſt ductarius funis, qui deinde
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in ſui poſtrema parte à potentia tractus omnes illos
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orbiculos, per quos tranſit circumuoluens inferius
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loculamentum, cui appenſum eſt pondus, vnà cum
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pondere attollit. </
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<
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id
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">figuram ſimplicis trochleæ, con
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ſtantis ſcilicet ex duobus tantum orbiculis, facilita
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tis cauſa exhibebo, in hac enim melius apparebit,
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qua ratione trochlea ad vectem reducatur. </
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<
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">vnde, &
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Ariſt. ſenſum, quamuis obſcuriſſimum, ac proinde
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problematis ſolutionem optimè percipere licebit.
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</
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<
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">Sit igitur orbiculus ſuperior A, qui in pegmate I K
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L D, voluatur circa axem G,
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; pegma iſtud ſupe
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rius fixum, & immobile à clauo H, pendens. </
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rior orbiculus B, in loculamento O P Q R, circa
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axem B, conuoluatur: ſitque funis ductarius circa
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hos orbiculos hoc modo circumductus. </
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put funis religetur clauo D, in ſuperiori pegmate
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infixo, hinc demiſſus ſubtus inferiorem rotulam per
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ipſius ſtriam deſcendat per puncta L S, aſcendatque
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poſtea per M E N, ad ſuperiorem rotulam, ſupra
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quam aſcendat per punctum T,
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; ad V, &
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inde demittatur ad
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potẽtiam
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F. Iam ſi quepiam po
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tentia in F, traxerit funem F V, deorſum, interim
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partes T, N, E, M, ſurſum attrahentur, & locula
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mentum inferius ſimul cum appenſo pondere eleua
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bitur, manente tamen interim fune prope D, vbi
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clauo D, eſt religatus, & immobilis. </
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<
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">ſed vbinam hic
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vectis? </
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<
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">conſidera diametrum M L, inferioris orbiculi, hæc enim ea eſt, quæ </
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