DelMonte, Guidubaldo, Mechanicorvm Liber

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1pendicularis, ſcilicet do­
nec CG in CD redeat.

Quando autem CG erit
in CD, linea EF, cùm
ipſi CG ſemper ad rectos
ſit angulos, erit in AB; in
quo ſitu quoq; manebit.
li
bra ergo EF in AB hori­
zonti æquidiſtantem redi
bit, ibíq; manebit.
quod
demonſtrare oportebat.
4. primi Archi
medis de
æqueponde­
rantibus.
1. Huius1. Huius.
8[Figure 8]
PROPOSITIO III.
Libra horizonti æquidiſtans æqualia in extre­
mitatibus, æqualiterq; à perpendiculo diſtan­
tia habens pondera, centro infernè collocato, in
hoc ſitu manebit.
ſi verò inde moueatur, deor­
ſum relicta, ſecundùm partem decliuiorem mo­
uebitur. 9[Figure 9]
Sit libra AB rectá li­
nea horizonti æquidi­
ſtans, cuius centrum C
ſit infra libram; perpen­
diculumq; ſit CD, quod
horizonti perpendiculare
erit; & diſtantia AD ſit
diſtantiæ DB æqualis;
ſintq; in AB pondera
æqualia, quorum grauita­
tis centra ſint in punctis
AB.
Dico primùm libram AB in hoc ſitu manere. Quoniam
enim AB bifariam diuiditur à puncto D, & pondera in AB ſunt
æqualia; erit punctum D centrum grauitatis magnitudinis ex

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