Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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<
chap
id
="
N10019
">
<
pb
pagenum
="
258
"
xlink:href
="
005/01/266.jpg
"/>
<
p
id
="
N17937
"
type
="
main
">
<
s
id
="
N17939
">Sed contra etiam eſt, quia ſi qualitas prædicta' impetus
<
lb
/>
impreſsi deficeret per meram deſitionem ad remotionem
<
lb
/>
impellentis, vel proijcientis, ſtatim atque proiectum elabi
<
lb
/>
tur è manu proijcientis, inciperet ipſa impetus remiſsio,
<
lb
/>
<
expan
abbr
="
creſceretq.
">creſceretque</
expan
>
vſque ad totalem deſitionem. </
s
>
<
s
id
="
N17947
">At non ita con
<
lb
/>
tingit, cum potius proiecta è manibus proijcientium egreſ
<
lb
/>
ſa, tardius moueantur à principio, quàm in progreſſu vſque
<
lb
/>
ad certum terminum, ad quem virtus impulſiua valet per
<
lb
/>
tingere,
<
expan
abbr
="
validiusq.
">validiusque</
expan
>
propterea feriant in proportionata qua
<
lb
/>
dam diſtantia, quàm prope nimis ipſum proijciens: Ergo
<
lb
/>
indicium eſt ipſam impetus qualitatem, non deficere, nec
<
lb
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remitti ſtatim ad defectum cauſæ conſeruantis, & impel
<
lb
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lentis, ſed potius augeri per aliquod tempus, deinde paula
<
lb
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tim remitti.ac tandem diſcedere ad expulſionem ortam ex
<
lb
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qualitate contraria. </
s
>
</
p
>
<
p
id
="
N17962
"
type
="
main
">
<
s
id
="
N17964
">Verùm huic obiectioni facilè occurritur dicendo, impe
<
lb
/>
tum poſt remotionem impellentis, nullum ex ſe incremen
<
lb
/>
tum poſſe ſuſcipere, ſiue habeat, ſiue non habeat qualitatem
<
lb
/>
contrariam; cauſamque tarditatis, ſeu minoris velocitatis
<
lb
/>
prædictæ in principio, eſſe maiorem reſiſtentiam, quam ſub
<
lb
/>
ipſo initio proiectum reperit in intermedio. </
s
>
<
s
id
="
N17971
">Nam aer, verbi
<
lb
/>
gratia, vel aqua quieſcens, cum primo à proiecto impellitur
<
lb
/>
magis valet reſiſtere, quàm cum paulatim dimota per no
<
lb
/>
uum ſemper impulſum vlterius abire cogitur, vt locum re
<
lb
/>
linquat ipſi proiecto. </
s
>
<
s
id
="
N1797C
">Impetus enim in eodem aere, vel
<
lb
/>
aqua impreſſus creſcit ſemper cum motu, quia proiectum
<
lb
/>
dum fertur ſemper impellit, ac impellendo ſucceſsiuè in
<
lb
/>
tendit effectum: magis autem intenſus impetus in ipſo me
<
lb
/>
dio, magis ac magis difſfunditur in vlteriores partes eiuſdem
<
lb
/>
medij, quod propterea velocius diſcedit, ac locum, quem
<
lb
/>
habet relinquendo, minus reſiſtit. </
s
>
<
s
id
="
N1798B
">Quod idem in cauſa
<
lb
/>
eſt ſaltem ex parte, vt motus grauium è ſuperno aliquo lo
<
lb
/>
co
<
expan
abbr
="
decidẽtium
">decidentium</
expan
>
velocior ſit in progreſſu, quàm in principio,
<
lb
/>
vt ſupra innuimus. </
s
>
<
s
id
="
N17998
">Etenim inter motum grauium natura
<
lb
/>
lem, quo illa tendunt deorſum, ac motum violentum, quo
<
lb
/>
tendunt ſurſum, vel ad latera, hoc ſolum intereſt in propoſi-</
s
>
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