DelMonte, Guidubaldo
,
Mechanicorvm Liber
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lud, dùm libra mouetur, proprium mutare ſitum. </
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2
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Huius.
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3
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Huius.
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<
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">Quòd autem Ariſtoteles duas tantùm quæſtiones propo
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ſuerit, cur ſcilicet trutina ſuperius exiſtente, ſi libra non ſit
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horizonti æquidiſtans in æquilibrium, hoc eſt horizonti æqui
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diſtans redit: ſi autem trutina deorſum fuerit conſtituta, non
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redit; ſed adhuc ſecundùm partem depreſſam mouetur: verum
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quidem eſt. </
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<
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id
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">non tamen eius demonſtrationes maiori, & mino
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ri angulo, poſitioni〈qué〉 trutinæ (vt ipſi dicunt) innituntur. </
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<
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">In
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hoc enim mentem philoſophi aſignantis rationem diuerſitatis
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motuum libræ minimè attingunt. </
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<
s
id
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">tantùm enim abeſt philoſo
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phum has diuerſitates in angulos referre, vt potius in cauſa eſſe
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dicat magnitudinis alterius brachii libræ exceſſum à perpendiculo,
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modò ex vna, modò ex altera parte contingentem. </
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<
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">Vt trutina ſuperius in
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CF exiſtente, perpendicu
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lum erit FCG, quod ſe
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cundùm ipſum in centrum
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mundi ſemper vergit;
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quod quidem libram mo
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tam in DE in partes di
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uidit inæquales; & maior
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pars eſt verſus D: id au
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tem, quod plus eſt, deor
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ſum fertur; ergo ex par
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te D deorſum libra moue
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bitur, donec in AB re
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deat. </
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<
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id
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">ſi verò trutina ſit
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in CG deorſum, erit GCF perpendiculum, quod libram DE
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in partes inæquales ſimiliter diuidit: maior autem pars erit verſus
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E; quare ex parte E deorſum libra mouebitur. </
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<
s
id
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">quod vt rectè in
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telligatur, cùm trutina eſt ſupra libram, libræ quoq; centrum ſu
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pra libram eſſe intelligendum eſt; & ſi deorſum, centrum quoque
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deorſum: vt infra patebit. </
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<
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id
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">Aliter ipſa Ariſtotelis demonſtratio
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nihil concluderet. </
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<
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">exiſtente enim centro in ipſa libra, vt in C; quo
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cunq; modo moueatur libra, nunquam perpendiculum FG libram, </
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