Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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DE CENTRO GRA VIT. SOLID.
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          <pb o="10" file="0131" n="131" rhead="DE CENTRO GRA VIT. SOLID."/>
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          <head xml:space="preserve">THE OREMA VIII. PROPOSITIO VIII.</head>
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            <s xml:space="preserve">Cuiuslibet priſmatis, & </s>
            <s xml:space="preserve">cuiuslibet cylindri, uel
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            cylindri portionis grauitatis centrum in medio
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            ipſius axis conſiſtit.</s>
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            <s xml:space="preserve">Sit primum a f priſma æ quidiſtantibus planis contentũ,
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            quod ſolidum parallelepipedum appellatur: </s>
            <s xml:space="preserve">& </s>
            <s xml:space="preserve">oppoſito-
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            rum planorum c f, a h, d a, f g latera bifariam diuidantur in
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            punctis k l m n o p q r s t u x: </s>
            <s xml:space="preserve">& </s>
            <s xml:space="preserve">per diuiſiones ducantur
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            plana κ n, o r, s x. </s>
            <s xml:space="preserve">communes autem eorum planorum ſe-
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            ctiones ſint lineæ y z, θ φ, χ ψ: </s>
            <s xml:space="preserve">quæ in puncto ω conueniãt.
              <lb/>
            </s>
            <s xml:space="preserve">erit ex decima eiuſdem libri Archimedis parallelogrammi
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            c f centrum grauitatis punctum y; </s>
            <s xml:space="preserve">parallelogrammi a h</s>
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