Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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123
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communis ſupra tenacitatem, &
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ſpi
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ritus vini; quæ, iuxtà Ariſtotelis aſſumptum,
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maiorẽ
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tarditatem aſcendenti corpori affert denſitas aquæ,
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ſcilicèt duplò maior, quàm ſit ea difficultas, qua à
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ſpiritu vini aſcenſus eiuſdem pilæ impeditur. </
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<
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ſequitur, quòd velocitas eiuſdem pilæ B per aquam
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ad eam quam habere poteſt per ſpiritum vini com
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poſita ſit ex duabus proportionibus, ſcilicèt ex pro
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portione differentiarum leuitatum eorumdem cor
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porum, quæ erit vt duo ad vnum, & ex propoſitio
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ne reciproca reſiſtentiarum eorumdem mediorum̨,
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quæ ſe habet vt vnum ad duo, ſed proportio dupla,
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& ſubdupla componunt proportionem æqualitatis,
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igitur æquali velocitate aſcendet eadem veſica B
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per aquam A, & per
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abbr
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ſpiritũ
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vini O, quod eſt
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abbr
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euidẽ-tèr
">euiden
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tèr</
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falſum, & contra aſſertum eorumdem aduerſa
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riorum, ergo veſica aere plena non mouetur ſursùm
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in fluido vi leuitatis poſitiuæ, quod erat oſtenden
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dum. </
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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<
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">Sed antequam vlterius procedamus,
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debẽt
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ad exa
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men quoque reuocari aliæ obiectiones, quæ ab au
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thoribus clariſſimis afferuntur contra noſtram ſen
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tentiam. </
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<
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id
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">Et primò quidem conſiderabo argumenta,
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quæ deſumuntur à pyramidali figura flammæ lucer
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næ, a qua, inquam, figura putant euidens
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deduci, quòd flamma ipſa ſursùm impellatur ab in
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terno principio leuitatis, ſicque ratiocinantur:
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Vi
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demus quieto, & tranquillo aere flammum ferri ſursùm
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pyramidalitèr, cùm
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ſi per expresſionem hic motus fie-
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