Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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1
FEDERICI COMMANDINI
VRBINATIS LIBER DE CENTRO
GRAVITATIS SOLIDORVM.
DIFFINITIONES.
1
Centrvm grauitatis, Pappus
Alexandrinus in octauo ma­
thematicarum collectionum
libro ita diffiniuit.
λέγομεν δέ κέντρον βάρους ἑκάστου σώ
ματος ἐ̂ιναι σημε̂ιον τι κείμενον ἐντός, άφ'
ὅυ κατ' έποίνιαν ὰρτνθέν τό βάρος ν̔μερε̂ι
φερόμενον, καὶ φυλάσσει τήν ἐξ ἀρχῆς θέ­
σιν, ὀυ μὴ περιτρεπόμενον ἐν τῆ φορᾶ
. hoc eſt,
Dicimus autem centrum grauitatis uniuſcu­
iuſque corporis punctum quoddam intra poſi­
tum, à quo ſi graue appenſum mente concipia­
tur, dum fertur quieſcit; & ſeruat eam, quam in
principio habebat poſitionem: neque in ipſa la­
tione circumuertitur.
Poſſumus etiam hoc modo diffinire.
Centrum grauitatis uniuſcuiuſque ſolidæ figu
ræ eſt punctum illud intra poſitum, circa quod
undique partes æqualium momentorum conſi­
ſtunt.
ſi enim per tale centrum ducatur planum
figuram quomodocunque ſecans ſemper in

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