Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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teſt alia ſumpta ex centro grauitatis, vt proprium eſt me
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chanicarum ſpeculationum. </
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<
s
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N1271E
">Porrò libræ iam explicatæ cen
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trum grauitatis eſt punctum in medio iugi intrapoſitum, vt
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patet ex definitione. </
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<
s
id
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N12725
">Nam circa illud
<
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abbr
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vndiq.
">vndique</
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partes æqua
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lium ſunt momentorum. </
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<
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id
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N1272E
">Quando autem libra eſt in Aequi
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librio conſtituta, huiuſmodi centrum coincidit in eandem
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lineam perpendiculatem, in qua eſt centrum circumuolu
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tionis, ſeu axis ipſius libræ, ac centrum mundi; ſiue axis po
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natur ſupra, ſiue infra
<
expan
abbr
="
iugũ
">iugum</
expan
>
, vt videre eſt in deſcriptis figuris.
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</
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<
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id
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">Quo fit, vt libra in tali poſitione quieſcat; nam centrum
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grauitatis per breuiorem lineam, qua fieri poteſt tendit ad
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centrum mundi; nulla autem breuior eſt recta in ipſum ca
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dente. </
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<
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id
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N12747
">Quando verò libra per depreſſionem vnius, & ele
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uationem alterius partis ipſius,
<
expan
abbr
="
nõ
">non</
expan
>
manet in æquilibrio, tunc
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lb
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centrum grauitatis conſtituitur extra perpendiculum, ſeu li
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neam prædictam cadentem ad centrum mundi per
<
expan
abbr
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cẽtrum
">centrum</
expan
>
<
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circumuolutionis ipſius libræ; ac propterea neceſſario ipſum
<
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centrum grauitatis ſi ſupra eſt in parte eleuata, ablato pon
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dere partis oppoſitæ deſcendet, ac reuertetur in locum pri
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ſtinum, vt magis centro mundi appropinquetur per viam
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qua poteſt. </
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>
<
s
id
="
N12762
">Si verò infra eſt in parte depreſſa, etiam ſi pon
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dus ab illa auferatur, manebit; quia in illo ſitu ſimiliter &
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adhuc magis appropinquatur centro mundi quo tendit. </
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<
s
id
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N12769
">Quę
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omnia abſque alia figura perſpicua eſſe poſſunt ex deſcri
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ptis, ac fuſiùs, & exactiùs traduntur, cum à Guidone Vbaldo
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tractatu de libra, tum à Bernardino Baldo in hac quæſtione,
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qui tantam in centro grauitatis vim eſſe animaduertit ad
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præponderandum, vt hinc colligat, libras quæ axem habent
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ſupra iugum, non à quouis paruo pondere moueri, vel peni
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lb
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tus declinare, ſed ab eo
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expan
abbr
="
tantũ
">tantum</
expan
>
, quod ſuperet
<
expan
abbr
="
reſiſtentiã
">reſiſtentiam</
expan
>
cen
<
lb
/>
tri grauitatis, quę reſiſtentia proportionaliter eo maior ex
<
lb
/>
peritur, quo minus grauitatis
<
expan
abbr
="
cẽtrũ
">centrum</
expan
>
diſtat ab axe, ſeu centro
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lb
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circa quod ipſa libra conuertitur, vt
<
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abbr
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ibidẽ
">ibidem</
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ipſe demonſtrat. </
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<
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id
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">Verum quamuis prædicta omnia vera ſint, adhuc tamen
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aliquod deſideratur ad adæquatam omnino rationem tra
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dendam, cur axe exiſtente ſupra iugum, ſi eleuetur vna pars </
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