Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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chap
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N10019
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N15281
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main
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<
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pagenum
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174
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xlink:href
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005/01/182.jpg
"/>
inferioris trochleæ,
<
expan
abbr
="
quandoquidẽ
">quandoquidem</
expan
>
<
expan
abbr
="
nõ
">non</
expan
>
<
expan
abbr
="
vterq.
">vterque</
expan
>
idem genus ve
<
lb
/>
ctis exprimit, aut participat. </
s
>
<
s
id
="
N152A4
">Si igitur
<
expan
abbr
="
orbiculũ
">orbiculum</
expan
>
trochleæ ſu
<
lb
/>
perioris, hoc eſt ſupernè appenſæ conſideremus, eam ratio
<
lb
/>
nem vèctis obtinere comperiemus, quam participat etiam
<
lb
/>
libra æqualium brachiorum, nempe, cuius fulcimentum in
<
lb
/>
ter pondus, & potentiam collocatur. </
s
>
<
s
id
="
N152B3
">Porrò diameter or
<
lb
/>
biculi orizonti parallela FG longitudinem vectis refert,
<
lb
/>
axiculus verò qui in centro eſt vbi H, fulcimentum. </
s
>
<
s
id
="
N152BA
">Deinde
<
lb
/>
diametri extremum F à quo pondus cum inferiori trochlea
<
lb
/>
per funem propendet, vectis extremum exprimit, cui onus
<
lb
/>
eſt alligatum. </
s
>
<
s
id
="
N152C3
">Alterum verò diametri extremum G, vectis
<
lb
/>
extremum deſignat, cui virtus mouentis applicatur. </
s
>
</
p
>
<
p
id
="
N152C8
"
type
="
main
">
<
s
id
="
N152CA
">At ſi orbiculum inferioris trochleæ conſiderare velimus,
<
lb
/>
aliam in eo vectis ratione deprehendemus; illam vtique
<
lb
/>
cuius fulcimentum conſtituitur in altero extremo, pondus
<
lb
/>
verò in medio, vt 1. par. </
s
>
<
s
id
="
N152D3
">tex. 8. Additione 1 explicuimus.
<
lb
/>
</
s
>
<
s
id
="
N152D9
">Etenim ex duobus eius diametri extremis IK, alterum nem
<
lb
/>
pe K fulcitur à fune, cui veluti immobiliter innititur, eo
<
lb
/>
quod ipſa ſuſtineatur in D. </
s
>
<
s
id
="
N152E1
">Alterum verò extremum I ſur
<
lb
/>
ſum attollitur verſus F per motum eiuſdem funis ibi vim
<
lb
/>
præcipuam imprimentis. </
s
>
<
s
id
="
N152E8
">Pondus denique C propendet ex
<
lb
/>
medio vbi L,
<
expan
abbr
="
ibiq.
">ibique</
expan
>
propterea grauitat inter fulcimentum, &
<
lb
/>
potentiam attollentem. </
s
>
<
s
id
="
N152F3
">Ex quibus conſtat,
<
expan
abbr
="
vtriuſq;
">vtriuſque</
expan
>
trochleæ
<
lb
/>
orbiculos vectis rationem habere, ſed non eandem. </
s
>
</
p
>
<
p
id
="
N152FC
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type
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main
">
<
s
id
="
N152FE
">Quod ſi quæras quæ nam ex his duabus trochleis maius
<
lb
/>
potentiæ mouenti auxilium præſtet. </
s
>
<
s
id
="
N15303
">Reſpondetur, ſuperio
<
lb
/>
rem trochleam non tam auxilium, quàm commoditatem,
<
lb
/>
ac facilitatem ad trahendum illi præbere. </
s
>
<
s
id
="
N1530A
">Vt enim patet ex
<
lb
/>
Guido Vbaldo de trochlea propoſitione prima, beneficio
<
lb
/>
ipſius trochleæ ſuperioris ſupernè videlicet appenſæ quan
<
lb
/>
do potentia æqualis eſt ponderi inferius alligato, nullatenus
<
lb
/>
eleuare illud poterit, cum ita ſe habeat, ac ſi aliud eſſet ap
<
lb
/>
penſum pondus, æquale ponderi prædicto cum æquali di
<
lb
/>
ſtantia à centro, ſiue axiculo, circa quem diameter orbiculi
<
lb
/>
non ſecus ac libra conuertitur, vt clarius videre eſt in hac
<
lb
/>
figura, in qua linea AB diametrum referat orbiculi ABC </
s
>
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