Valerio, Luca, De centro gravitatis solidorum, 1604

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V.
Cuiuſlibet figuræ grauis centrum grauitatis
eſt punctum illud, à quo ſuſpenſum graue perſe
manet partibus quomodocumque circa conſti­
tutis.
VI.
Axis priſmatis, & pyramidis & eius fruſti di­
citur recta linea, quæ in pyramide à vertice ad
baſis centrum figuræ vel grauitatis pertinet: in
reliquis autem, quæ baſium oppoſitarum figuræ
vel grauitatis centra iungit.
VII.
Si qua figura ſolida planis parallelis ita ſeca­
ri poſſit, vt quæcumque ſectiones centrum ha­
beant, & ſint inter ſe ſimiles; aliqua autem recta
linea, ſiue ad centra baſium oppoſitarum prædi­
ctis ſectionibus parallelarum, & ſimilium, vt in
cylindro; ſiue ad verticem, & centrum baſis ter­
minata, vt in cono, hemiſphærio, & conoide, tran­
ſeat per centra omnium prædictarum ſectionum;
ea talis figuræ axis nominetur: ipſa autem figura,
ſolidum circa axim.
Quæ ſi vel vnam tantum ha­
beat baſim, vel duas inæquales, & parallelas: dua­
rum autem quarumlibet prædictarum ſectionum
vertici, vel minori baſi propinquior ſit minor re-

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