DelMonte, Guidubaldo, Mechanicorvm Liber

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18tibus omninò naturalibus) de ipſa ſermo haberi poſsit: ſine qui­
bus eorum, quæ libræ accidunt, veræ caulæ reperiri nullo mo
do poſsint.
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 a­
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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