DelMonte, Guidubaldo, Mechanicorvm Liber

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24donec libra EF in AB redeat. quod demonſtrare oportebat.
4 Primi.Ex 28 Tertii.29 Primi.
Huius autem effectus ratio ab Ariſtotele poſita, hic manifeſta in
tueri poteſt.
ſit enim punctum N vbi CS EF ſe inuicem ſecant.
& quoniam HE eſt ipſi HF æqualis; erit NE maior NF.
li­
nea ergo CS, quam perpendiculum vocat, libram EF in partes di
uidet inæquales.
cùm itaq; pars libræ NE ſit maior NF; atq; id,
quod plus eſt, neceſſe eſt, deorſum ferri: libra ergo EF ex parte E
deorſum mouebitur, donec in AB redeat.
Ariſtotelis ratio.
Ex iis præterea, quæ ha
ctenus dicta ſunt inferre li
cet, libram EF velocius ab
eo ſitu in AB moueri; vndè
linea EF in directum pro­
tracta in centrum mundi
perueniat.
vt ſit EFS recta
linea.
& quoniam CD
CH, ſunt inter ſe ſe æqua
les.
ſi igitur centro C, ſpa
tioq; CD, circulus deſcri­
batur DHM; erunt pun­
cta DH in circuli circum­
ferentia.
Quoniam au­
tem CH ipſi EF eſt per­
pendicularis; continget li­
nea EHS circulum DHM
in puncto H.
pondus igi­
tur in H (ſicuti ſupra de­
monſtrauimus) grauius
45[Figure 45]
erit, quàm in alio ſitu circuli DHM.
ergo magnitudo ex EF
ponderibus, & libra EF compoſita, cuius centrum grauitatis eſt
in H, in hoc ſitu magis grauitabit, quàm in quocunq; alio ſitu

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