DelMonte, Guidubaldo, Mechanicorvm Liber

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Ex 27 Tertii.Ex 32 primi.26 Primi.Ex 13 Primi.19 Primi.47 Primi.
Præterea ſi adhuc ſup
poſitionem
conceda­
mus
; à conſideratione
libræ
longè recedunt;
dum
eo pacto, vt libra
DE
in AB redire de­
beat
, diſcurrunt.
ſemper
enim
alterum pondus
ſeorſum
accipiunt, putá
D
, vel E; ac ſi modò vnum
modò
alterum in libra
conſtitutum
eſſet, nec
vllo
modo ambo con­
34[Figure 34]
nexa
; cuius tamen oppoſitum omninò fieri oportet; neq; alterum
ſine
altero rectè conſiderari poteſt; cùm de ipſis in libra conſti­
tutis
ſermo habeatur.
cùm enim dicunt, deſcenſum ponderis in
D
minus obliquum eſſe deſcenſu ponderis in E; erit pondus in
D
per ſuppoſitionem grauius pondere in E: quare cùm ſit graui­
us
, neceſſe eſt deorſum moueri, libramq; DE in AB redire: di
ſcurſus
iſte nullius prorſus momenti eſt.
Primùm quidem ſem­
per
argumentantur, ac ſi pondera in DE deſcendere debeant,
vnius
tantùm ſine alterius connexione conſiderando deſcenſum.

poſtremò
tamen ob ponderum deſcenſuum comparationem colli­
gentes
inferunt, pondus in D deorſum moueri, & pondus in E
ſurſum
, vtraq; ſimul in libra inuicem connexa accipientes.
ve­
rùm
ex iiſdemmet, quibus vtuntur, principiis, ac demonſtratio
nibus
, oppoſitum eius, quod defendere conantur, facillimè col­
ligi
poteſt.
Nam ſi comparetur deſcenſus ponderis in D cum
ſcenſu
ponderis in E, vt ductis EK DH ipſi AB perpendicula­
ribus
; cùm angulus DCH ſit æqualis angulo ECk; & angulus
DHC
rectus æqualis eſt recto E k C; & latus DC lateri CE æqua
le
: erit triangulum CDH triangulo CEk æquale, & latus DH la­

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