Valerio, Luca, De centro gravitatis solidorvm libri tres

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1grauitatis, nempe in linea BD, ſit propinquius baſi AC,
ſiue termino D, quàm prædictæ datæ figuræ circumſcriptæ
centrum grauitatis, Omnium enim cylindrorum, vel cy­
lindri portionum, vel parallelogrammorum, ex quibus con­
ſtat prædicta data figura circumſcripta ſint axes, vel quæ
oppoſita latera coniungunt rectæ BL, LM, MD, qui­
bus ſectis bifariam in punctis N, O, P, ac planis per ea
ſiue rectis tranſeuntibus baſi AC parallelis, ſecantibus­
que dictos cylindros, vel cylindri portiones, vel pa­
rallelogramma, compleatur & figuræ ABC circumſcri­
batur altera figura
vt prior, quæ ob ſe­
ctiones factas com­
ponetur ex duplis
multitudine cylin­
dris, vel cylindri por­
tionibus, vel paralle­
logrammis ęqualium
altitudinum, eorum
ex quibus conſtat da­
ta figura circumſcri­
pta ſinautem hi cy­
lindri, aut reliqua,
quæ diximus QR,
105[Figure 105]
ES, TV, GX, ZI, AY.
Quoniam igitur cylindro­
rum, vel cylindri portionum, vel parallelogrammorum quæ
ſunt circa figuram ABC, minor eſt proportio QR ad ES,
quàm ES, ad TV, propter ſectiones circulos, vel ſimiles
ellipſes, vel rectas lineas, & æqualitatem altitudinum, & figuræ
propoſitæ naturam.
Sed eadem ratione minor eſt proportio ES
ad TV, quàm TV, ad GX; multo ergo minor proportio erit
QR ad ES, quam TV ad GX: & componendo, minor
proportio QR, ES, ſimul ad ES, quàm TV, GX, ſimul
ad GX. ſed vt GX ad GH, ita eſt ES ad EF; ex æqua-

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