DelMonte, Guidubaldo, In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata

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27[Figure 27] 28[Figure 28] 29[Figure 29]
In demonſtratione autem huius quartæ propoſitionis in­
quit
Archimedes. Quòd autem ſit in linea AB, præostenſum eſt. qua
ſi
dicat Archimedes, ſe priùs oſtendiſſe centrum grauitatis ma
gnitudinis
ex AB compoſitæ eſſe in linea AB; quod tamen
in
ijs, quæ dicta ſunt, non videtur expreſſum.
virtute tamen ſi
conſideremus
ea, quę in prima, tertiaquè propoſitione dicta
ſunt
, facilè ex his concludi poteſt, centrum grauitatis magni­
tudinis
ex duabus magnitudinibus compoſitæ eſſe in recta li
nea
, quæ ipſarum centra grauitatis coniungit.
Quare memi­
niſſe
oportet eorum, quę a nobis in expoſitione primi poſtu
lati
huius dicta fuere, nempè Archimedem ſupponere, diſtan­
tias
eſſe in vna, eademquè recta linea conſtitutas.
ideoquè in
prima
propoſitio nec inquit, Grauia, quę ex diſtantijs ęquali
bus
æ〈que〉ponderant, æqualia eſſe inter ſe; Archimedes què demom
ſtrat
, quòd quando æ〈que〉ponderant, ſunt æqualia: ex dictis
ſequitur
, ſi æ〈que〉ponderant, ergo centrum grauitatis magni­
tudinis
ex ipſis compoſitę erit in eo puncto, vbi æ〈que〉ponde­
rant
; hoc eſt in medio diſtantiarum, lineę ſcilicet, quę grauium
centra
grauitatis coniungit.
quod idem eſt, ac ſi Archimedes
dixiſſet
.
Grauia, quę habent centrum grauitatis in medio li­
neę
, quę magnitudinum centra grauitatis coniungit, ęqua­
lia
ſunt inter ſe.
cuius quidem hęc quarta propoſitio videtur
eſſe
conuerſa.
quamuis Archimedes loco grauium nominet
magnitudines
.
Pręterea in tertia propoſitione, quoniam oſten­
dit
Archimedes, inęqualia grauia ę〈que〉ponderare ex diſtantijs
inęqualibus
, ita vt grauius ſit in minori diſtantia, ſequitur er
go
centrum grauitatis eſt in eo puncto, vbi æ〈que〉ponderant;
& idem eſt, ac ſi dixiſſet, in æqualium grauium centrum gra­
uitatis
eſt in recta linea, quæ ipſorum centra grauitatis con­
iungit
; ita vt ſit propinquius grauiori, remotius uerò leuiori.

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