Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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quæ interſecundam, & vltimam ſectionem inter
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ijcitur, vt exceſſus, quo maior extrema ad ſphæræ
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ſemidiametrum, & axim portionis ſuperat ter
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tiam partem axis portionis; ad maiorem extre
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mam antedictam. </
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<
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>Sit portio ABCD ſphæræ, cuius centrum F: axis au
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tem portionis ſit EF abſciſsæ duobus planis parallelis,
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quorum alterum tranſiens per punctum F faciat ſectio
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num circulum maximum, cuius diameter AD, reliquam
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autem ſectionem minorem circulum, quæ minor baſis di
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citur, cuius di
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ameter BC:
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& vt eſt EF
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ad AD, ita
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fiat AD ad
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OP, cuius P
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R, ſit æqua
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lis tertiæ parti
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axis EF. </
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<
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ſecta EF bi
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fariam in puncto M, & poſita EN ipſius EF quarta
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parte, fiat vt RO ad OP, ita MN ad NL. </
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<
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>Dico L eſſe
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centrum grauitatis portionis ABCD. </
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<
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>Nam circa axim
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EF ſuper circulum maximum AD deſcribatur cylindrus
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AG, cuius centrum grauitatis erit M: reliqui autem ex
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cylindro AG dempta ABCD portione centrum graui
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tatis N. </
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<
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>Quoniam igitur eſt vt RO ad OP, hoc eſt vt
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MN ad NL, ita portio ABCD ad reliquum cylindri
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AG, & diuidendo vt NM ad ML, ita portio ABCD ad
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reliquum cylindri AG: & cylindri AG eſt N, prædicti au
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tem reſidui centrum grauitatis M; erit reliquæ portionis
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ABCD centrum grauitatis L. </
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<
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erat. </
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