Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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<
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77
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te magis grauitaret, nempe ex plumbo adiuncto, & ex ma
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iori longitudine brachij, nunquam libra ponderibus, ac mer
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cibus vacua, in æquilibrio poſſet conſtitui, fed ſatis apertè
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huiuſmodi lanx ſemper deorſum tenderet, altera verò ſur
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ſum;
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nulla ex hoc oriretur deceptio,
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fraus,
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quæ ex deceptione conſequitur. </
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<
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id
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">Quando igitur Ariſtote
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les ait, purpurarios plumbum, vel quid ſimile in eam, quam
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deferri volunt partem conſtituere, intelligendus eſt de par
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te, ſeu de brachio libræ minori, quod certè ſurſum aſcende
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ret ad deſcenſum maioris, ac deferri non poſſet ad conſti
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tuendum Aequilibrium, niſi ſimilibus adiumentis quantum
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opus eſt deprimeretur; vt rectè etiam notat Cardanus lib.
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1. de principijs prope finem. </
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<
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<
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">C
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vr ſiquidem curſum ſuerit ſpartum, quan
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do deorſum lato pondere quiſpiam id amouet,
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rurſum aſcendit libra: ſi autem deorſum con
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ſtitutum fuerit, non aſcendit, ſed manet? </
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<
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">An
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quia ſurſum quidem ſparto existente plus li
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bræ extra perpendiculum fit: quare neceſſe
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eſt deorſum ferri id quod plus eſt, donec aſcendat, quæ bifa
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riam libram diuidit, ad ipſum perpendiculum, cùm onus in
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cumbat ad libræ partem ſurſum raptum.
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Sit libra recta, vbi BC, ſpartum autem AD. </
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<
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id
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">Hoc igi
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tur deorſum proiecto perpendiculum erit, vbi ADM. </
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<
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id
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">Si igi
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tur in ipſo B ponatur onus, B quidem erit, vbi E, C autem
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vbi H s quamobrem ea, quæ bifariam libram ſecat, primò
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quidem erit DM ipſius perpendiculi: incumbente autem
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onere DG, quare libræ ipſius vbi EH, quòd extra perpen
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diculum eſt AM, vbi eſt PQ, maius eſi dimidio. </
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<
s
id
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N12571
">Si igitur
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amoueatur onus ab ipſo E, neceſſe eſt deorſum ferri H mi
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nus enim eſt E. </
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<
s
id
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">Siquidem igitur ſurſum habuerit ſpartum,
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