Valerio, Luca, De centro gravitatis solidorum, 1604

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1quat, centrum grauitatis vtriuſque abſciſsi priſ­
matis tamquam vnius magnitudinis rectam line­
lam, quæ prædicti priſmatis parallelorum paral
lelogrammorum centra iungit, ita diuidit, vt
pars, quæ minus parallelogrammum attingit ſit
dupla reliquæ.
Sit priſma ABCDEFGH, cuius baſes oppoſitæ tra­
pezia ADHE, BCGF.
Sint autem AD, EH, paral­
lelæ, quarum maior EH.
Oppoſita igitur parallelogram­
ma AC, EG, inter ſe erunt parallela, quorum maius EG.
At per rectas AB, CD, ſectum ſit priſma. ABCDEF
GH, ita vt abſciſſa priſmata ABSFER, CDVHGT,
relinquant parallelepipedum AT, ipſum autem AT, re­
linquat duo parallelogramma æqualia ES, TH.
Poſito
autem centro K
parallelogrammi
AC, & L, paral
lelogrammi EG,
iunctaque KL,
ponatur KM, du
pla ipſius ML.
Dico duorum priſ­
matum BER,
CVH, ſimul cen
trum grauitatis
93[Figure 93]
eſse M.
Sectis enim AB, CD, bifariam in punctis P, Q,
ſumptiſque parallelogrammorum ES, VG, centris N, O,
iungantur PN, QO, & poſita PX dupla ipſius XN, & QZ
dupla ipſius ZO, iungantur rectæ PKQ, XZ, NO.
Quoniam igitur in quadrilatero PQON, recta XZ, pa­
rallela eſt vtrilibet ipſarum PQ, NO, ſecat ijs parallelis
interceptas in eaſdem rationes; recta igitur XT per pun-

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