DelMonte, Guidubaldo, Mechanicorvm Liber

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77mo alicubi religetur, altero autem à potentia
mouente pondus appræhenſo; vecte ſemper ho
rizonti æquiſtante potentia mouebit.
Sit pondus A; Sit orbiculus.
CED trochleæ ponderi A alli­
gatæ ex kH; ſitq; KH ad rectos
angulos horizonti, ita vt pon­
dus ſemper trochleæ motum, ſi­
ue ſurſum, ſiue deorſum factum
ſequatur; ſitq; orbiculi centrum
K; & funis orbiculo circumuo­
lutus ſit BCDEF, qui relige­
tur in B, ita vt in B immobilis
maneat; & ſit potentia in F mo­
uens pondus A.
dico potentiam
in F ſemper mouere pondus A ve
cte horizonti æquidiſtante.
ſint
BC EF inter ſe ſe, ipſiq; kH æ­
quidiſtantes, & eiuſdem kH ho
rizonti perpendiculares, tangen
teſq; circulum CED in EC punctis;
et connectatur EC, quæ per cen
trum k tranſibit, horizontiq;
æquidiſtans erit; ſicuti prius di
ctum eſt.
Quoniam enim or
biculus CED circa eius cen
trum K vertitur; ideo dum vis
in F trahit ſurſum punctum E,
deberet punctum C deſcende
re, ac trahere deorſum B; ſed fu
159[Figure 159]
nis in B eſt immobilis, & BC descendere non poteſt; quare dum
potentia in F trahit ſurſum E, totus orbiculus ſurſum mouebitur;
ac per conſequens tota trochlea, & pondus; & EkC erit tanquam
vectis, cuius fulcimentum erit C; eſt enim punctum C propter BC
ferè immobile, potentia verò mouens vectem eſt in F fune EF,

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