DelMonte, Guidubaldo, Mechanicorvm Liber

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1
Sit pondus A,
cui
alligatus ſit fu­
nis
in B; trochleaq;
habens
orbiculum C
EF
, cuius centrum
D
, ſurſum appenda­
tur
; ſitq; D quoq;
centrum
axiculi; &
circa
orbiculum uo­
luatur
funis BC EF
G
; ſitq; potentia
in
G ſuſtinens pon­
dus
A.
dico poten­
tiam
in G ponderi A
æqualem
eſſe.
Sit FG
æquidiſtans
CB.

Quoniam
igitur pon
dus A manet; erit
135[Figure 135]
CB
horizonti plano perpendicularis: quare FG eidem plano per­
pendicularis erit.
Sint CF puncta in orbiculo, à quibus funes CB FG
in
horizontis planum ad rectos angulos deſcendunt; tangent BC FG
orbiculum CEF in punctis CF.
orbiculum enim ſecare non poſſunt. con
nectantur
DC DF; erit CF recta linea, & anguli DCB DFG recti.

Quoniamautem BC tùm horizonti, tùm ipſi CF eſt perpendicularis;
erit
linea CF horizonti æquidiſtans.
cùm verò pondus appenſum ſit
in BC, & potentia ſit in G; quod idem eſt, ac ſi eſſet in F; erit
CF
tanquam libra, ſiue vectis, cuius centrum, ſiue fulcimentum eſt
D
; nam in axiculo orbiculus ſuſtinetur; atq; punctum D, cùm ſit
centrum
axiculi, & orbiculi, etiam vtriſque circumuolutis
immobile
remanet.
Itaq; cùm diſtantia DC ſit æqualis diſtantiæ
DF
, potentiaq; in F ponderi A in C appenſo æqueponderet, cùm
pondus ſuſtineat, ne deorſum vergat; erit potentia in F, ſiue in G
(nam idem eſt) conſtituta ponderi A æqualis.
Idem enim effi­
cit
potentia in G, ac ſi in G aliud eſſet appenſum pondus æquale
ponderi
A; quæ pondera in CF appenſa æquæponderabunt.
Præ­
terea
, cùm in neutram fiat motus partem, idem erit vnico exi­

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