Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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<
chap
id
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N10019
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<
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N12712
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main
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<
s
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N12714
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<
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pagenum
="
81
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xlink:href
="
005/01/089.jpg
"/>
teſt alia ſumpta ex centro grauitatis, vt proprium eſt me
<
lb
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chanicarum ſpeculationum. </
s
>
<
s
id
="
N1271E
">Porrò libræ iam explicatæ cen
<
lb
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trum grauitatis eſt punctum in medio iugi intrapoſitum, vt
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lb
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patet ex definitione. </
s
>
<
s
id
="
N12725
">Nam circa illud
<
expan
abbr
="
vndiq.
">vndique</
expan
>
partes æqua
<
lb
/>
lium ſunt momentorum. </
s
>
<
s
id
="
N1272E
">Quando autem libra eſt in Aequi
<
lb
/>
librio conſtituta, huiuſmodi centrum coincidit in eandem
<
lb
/>
lineam perpendiculatem, in qua eſt centrum circumuolu
<
lb
/>
tionis, ſeu axis ipſius libræ, ac centrum mundi; ſiue axis po
<
lb
/>
natur ſupra, ſiue infra
<
expan
abbr
="
iugũ
">iugum</
expan
>
, vt videre eſt in deſcriptis figuris.
<
lb
/>
</
s
>
<
s
id
="
N1273E
">Quo fit, vt libra in tali poſitione quieſcat; nam centrum
<
lb
/>
grauitatis per breuiorem lineam, qua fieri poteſt tendit ad
<
lb
/>
centrum mundi; nulla autem breuior eſt recta in ipſum ca
<
lb
/>
dente. </
s
>
<
s
id
="
N12747
">Quando verò libra per depreſſionem vnius, & ele
<
lb
/>
uationem alterius partis ipſius,
<
expan
abbr
="
nõ
">non</
expan
>
manet in æquilibrio, tunc
<
lb
/>
centrum grauitatis conſtituitur extra perpendiculum, ſeu li
<
lb
/>
neam prædictam cadentem ad centrum mundi per
<
expan
abbr
="
cẽtrum
">centrum</
expan
>
<
lb
/>
circumuolutionis ipſius libræ; ac propterea neceſſario ipſum
<
lb
/>
centrum grauitatis ſi ſupra eſt in parte eleuata, ablato pon
<
lb
/>
dere partis oppoſitæ deſcendet, ac reuertetur in locum pri
<
lb
/>
ſtinum, vt magis centro mundi appropinquetur per viam
<
lb
/>
qua poteſt. </
s
>
<
s
id
="
N12762
">Si verò infra eſt in parte depreſſa, etiam ſi pon
<
lb
/>
dus ab illa auferatur, manebit; quia in illo ſitu ſimiliter &
<
lb
/>
adhuc magis appropinquatur centro mundi quo tendit. </
s
>
<
s
id
="
N12769
">Quę
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lb
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omnia abſque alia figura perſpicua eſſe poſſunt ex deſcri
<
lb
/>
ptis, ac fuſiùs, & exactiùs traduntur, cum à Guidone Vbaldo
<
lb
/>
tractatu de libra, tum à Bernardino Baldo in hac quæſtione,
<
lb
/>
qui tantam in centro grauitatis vim eſſe animaduertit ad
<
lb
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præponderandum, vt hinc colligat, libras quæ axem habent
<
lb
/>
ſupra iugum, non à quouis paruo pondere moueri, vel peni
<
lb
/>
tus declinare, ſed ab eo
<
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
<
lb
/>
circa quod ipſa libra conuertitur, vt
<
expan
abbr
="
ibidẽ
">ibidem</
expan
>
ipſe demonſtrat. </
s
>
</
p
>
<
p
id
="
N12790
"
type
="
main
">
<
s
id
="
N12792
">Verum quamuis prædicta omnia vera ſint, adhuc tamen
<
lb
/>
aliquod deſideratur ad adæquatam omnino rationem tra
<
lb
/>
dendam, cur axe exiſtente ſupra iugum, ſi eleuetur vna pars </
s
>
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