DelMonte, Guidubaldo, Mechanicorvm Liber

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3267[Figure 67]
Sit deniq; libra AB, & ex punctis AB ſuſpenſa ſint pondera
EF
; ſitq; centrum libræ C intra pondera; diuidaturq; AB in
D
, ita vt AD ad DB ſit, vt pondus F ad pondus E.
Dico pon
dera
EF tàm in AB ponderare, quám ſi vtraq; ex puncto D ſuſpen
dantur
.
fiat CG æqualis ipſi CD; & vt DC ad CA, ita fiat
pondus
E ad aliud H; quod appendatur in D.
vt autem GC ad
CB
, ita fiat pondus F ad aliud K; appendaturq; k in G.
Quoniam enim
eſt
, vt BC ad CG, hoc eſt ad CD, ita pondus k ad F; erit K ma
ius
pondere F.
quare diuidatur pondus k in L, & MN; fiatq;
pars
L ipſi F æqualis; erit vt BC ad CD, vt totum LMN ad
L
; & diuidendo, vt BD ad DC, ita pars MN ad partem L.
vt
igitur
BD ad DC, ita pars MN ad F.
vt autem AD ad DB,
ita
F ad E: quare ex æquali, vt AD ad DC, ita MN ad E.
cùm
verò
AD ſit ipſa CD maior; erit & pars MN pondere E
maior
: diuidatur ergo MN in duas partes MN, ſitq; M æqua
lis
ipſi E.
erit vt AD ad DC, vt NM ad M; & diuidendo, vt
AC
ad CD, ita N ad M: conuertendoq; vt DC ad CA, ita M
ad
N.
vt autem DC ad CA, ita eſt E ad H; erit igitur M ad N
vt
E ad H; & permutando, vt M ad E, ita N ad H.
ſed ME
ſunt
inter ſe æqualia, erunt NH inter ſeſe quoq; æqualia.
& quo­
niam
ita eſt AC ad CD, vt H ad E: pondera HE æqueponde­
rabunt
.
ſimiliter quoniam eſt vt GC ad CB, ita F ad k, ponde­

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