DelMonte, Guidubaldo, Mechanicorvm Liber

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1capiat XM: cùm ipſi
quoq; hoc modo acci­
piant, atq; ita accipe­
re ſit neceſſe.
ſi enim li­
bram DE in AB redire
demonſtrare volunt, com
parando deſcenſus pon­
deris in D cum deſcen­
ſu ponderis in E, neceſſe
eſt, vt oſtendant rectum
deſcenſum OC corre­
ſpondentem circumferen
tiæ DA maiorem eſſe re
cto deſcenſu TH circum
31[Figure 31]
ferentiæ EV correſpondente.
ſi enim partem tantùm totius de­
ſcenſus ex D in A acciperent, vt D k; oſtenderentq; magis cape­
re de directo deſcenſum Dk, quàm æqualis portio deſcenſus ex
puncto E.
ſequetur pondus in D ſecundùm ipſos grauius eſſe pon
dere in E; & vſq; ad k tantùm deorſum moueri: ita vt libra mo
ta ſit in kI.
ſimiliter ſi libram KI in AB redire demonſtrare vo
lunt accipiendo portionem deſcenſus ex k in A; hoc eſt k S;
oſtenderentq; k S magis de directo capere, quàm ex aduerſo æ­
qualis deſcenſus ex puncto I: ſimili modo ſequetur pondus in k
grauius eſſe, quàm in I; & vſq; ad S tantùm moueri.
& ſi rurſus
oſtenderent portionem deſcenſus ex S in A, atq; ita deinceps, re
ctiorem eſſe æquali deſcenſu ponderis oppoſiti; ſemper ſequetur
libram SI ad AB propius accedere, nunquam tamen in AB per­
uenire demonſtrabunt.
ſi igitur libram DE in AB redire demon
ſtrare volunt, neceſſe eſt, vt deſcenſum ponderis ex D in A de di
recro capere quantitatem lineæ ex puncto D ipſi AB ad rectos
angulos ductæ accipiant.
atq; ita, ſi æquales deſcenſus DA AN
inuicem comparemus, qui æqualiter de directo capient OC CT,
eueniet idem pondus in D æquè graue eſſe, vt in A.
ſi verò por
tiones tantum ex D A accipiamus; grauius erit in A, quàm
in D.
ergo ex diuerſitate tantùm modi conſiderandi, idem pon
dus, & grauius, & leuius eſſe continget.
non autem ex ipſa na­

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