Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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modò facilius extrahatur; plumbum vel ſimile aliud onus
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ſuperimponitur ipſi extremo C, vt eo depreſſo, eleuetur
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alterum extremum D, per conuerſionem ipſius ligni CD,
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tanquam vectis ſuper fulcimentum A; & ad eleuationem
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ipſius extremi D, vas ex eo pendens, pariter euehatur, & è
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puteo extrahatur. </
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<
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id
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N16F43
">Expedit autem facilitas potius in vaſis
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extractione, quàm in demiſſione;
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tam ex parte poten
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tiæ, quàm ex parte ponderis. </
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<
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">Ex parte quidem potentiæ,
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quia laborioſus eſt cum difficultate extrahere, quàm cum
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difficultate demittere. </
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<
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id
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N16F55
">Nam corpus humanum dum ex
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trahendo inclinatur, ſuo præpeditur pondere, ne expeditiùs
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erigatur,
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abbr
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funemq.
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paulatim reducat, & per eam vas ipſum
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ſubleuet. </
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<
s
id
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N16F62
">Contra verò dum ad vas demittendum, & immer
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gendum, funis cum ligni extremo D trahitur deorſum, illi
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naturali quodam nutu incumbit, commodiuſque vires
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exerit, ac difficultatem omnem euincit; vt experiri etiam eſt
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in vſu trachleæ ad exhauriendam aquam, vel ſuſtollendum
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quodlibet aliud pondus per funis detractionem. </
s
>
<
s
id
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">Deinde
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ex parte ponderis, quia minor eſt difficultas demiſsionis,
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quàm extractionis prædictæ. </
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<
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id
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N16F76
">Siquidem pondus lapidis, aut
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plumbi, quod ſuperari debet in vaſis miſsione, æquale eſt
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ponderi ſolius aquæ hauriendæ ipſo eodem vaſe, vt dictum
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eſt: pondus autem quod ſuperandum eſt in extractione,
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non ſolum eſt pondus aquæ hauriendæ, ſed etiam
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vaſis, ac funis, ideoque maius conſtituitur,
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ac difficilius ſuperatur. </
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<
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id
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">Conſultius ergo
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eſt, maiori difficultati ſuccur
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rere ipſo machinæ bene
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ficio, ac ponde
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re adie
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cto
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in altero extremo, vt
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aiebat Philoſo
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phus. </
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