DelMonte, Guidubaldo, Mechanicorvm Liber

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28
Habeat autem libra AB
centrum C in ipſa libra, atq;
in eius medio: erit C libræ
centrum quoq; grauitatis;
à quo ipſi AB, horizontiq;
perpendicularis ducatur FC
G.
ponatur deinde in B
quoduis pondus; erit totius
magnitudinis centrum gra­
uitatis putá in E; ita vt CE
53[Figure 53]
ad EB ſit, vt pondus in B ad libræ grauitatem.
& quoniam CE
non eſt horizonti perpendicularis, libra AB, atq; pondus in B
in hoc ſitu nunquam manebunt; ſed deorſum ex parte B mouebun
tur, donec CE horizonti fiat perpendicularis.
hoc eſt donec li­
bra AB in FG perueniat.
ex quo patet, quolibet pondus in B
circuli quartam ſemper deſcribere.
Sit autem centrum C in­
fra libram AB.
ſitq; DCE
perpendiculum.
ſimiliter
poſito in B pondere, cen­
trum grauitatis magnitudi
nis ex AB libra, & ponde
re in B compoſitæ in linea
DB erit; vt in F; ita vt DF
ad FB ſit, vt pondus in B
54[Figure 54]
ad libræ pondus.
Iungatur CF. & quoniam CD horizonti eſt
perpendicularis; linea CF horizonti nequaquam perpendicula­
ris exiſtet.
quare magnitudo ex AB libra, ac pondere in B com
poſita in hoc ſitu nunquam perſiſtet; ſed deorſum, niſi aliquid
impediat, mouebitur; donec CF in DCE perueniat: in quo ſitu
libra vná cum pondere manebit.
& punctum B erit vt in G, atq;
punctum A in H, libraq; GH non amplius centrum infra, ſed ſu
pra ipſam habebit.
quod idem ſemper eueniet; quamuis mini­
mum imponatur pondus in B.
ergo priuſquam B perueniat ad
G; neceſſe eſt libram, ſiue trutinæ deorſum poſitæ, vel alicui

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