Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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DE CENTRO GRAVIT. SOLID.
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          <pb o="22" file="0155" n="155" rhead="DE CENTRO GRAVIT. SOLID."/>
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            <s xml:space="preserve">Ex demonſtratis perſpicue apparet, portioni
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            ſphæræ uel ſphæroidis, quæ dimidia maior eſt, cẽ
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            trum grauitatis in axe conſiſtere.</s>
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          </p>
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            <s xml:space="preserve">Data enim
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              <anchor type="figure" xlink:label="fig-0155-01a" xlink:href="fig-0155-01"/>
            qualibet maio
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            ri portiõe, quo
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            niã totius ſphæ
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            ræ, uel ſphæroi
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            dis grauitatis
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            centrum eſt in
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            axe; </s>
            <s xml:space="preserve">eſt autem
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            & </s>
            <s xml:space="preserve">in axe cen-
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            trum portio-
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            nis minoris:
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            </s>
            <s xml:space="preserve">reliquæ portionis uidelicet maioris centrum in axe neceſ-
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            ſario conſiſtet.</s>
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            <figure xlink:label="fig-0155-01" xlink:href="fig-0155-01a">
              <image file="0155-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/4E7V2WGH/figures/0155-01"/>
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          <head xml:space="preserve">THE OREMA XIII. PROPOSITIO XVII.</head>
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            <s xml:space="preserve">Cuiuslibet pyramidis triã
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            gularem baſim habẽtis gra
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            uitatis centrum eſt in pun-
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            cto, in quo ipſius axes con-
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            ueniunt.</s>
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            <figure xlink:label="fig-0155-02" xlink:href="fig-0155-02a">
              <image file="0155-02" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/4E7V2WGH/figures/0155-02"/>
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            <s xml:space="preserve">Sit pyramis, cuius baſis trian
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            gulum a b c, axis d e: </s>
            <s xml:space="preserve">ſitq; </s>
            <s xml:space="preserve">trian
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            guli b d c grauitatis centrum f:
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            </s>
            <s xml:space="preserve">& </s>
            <s xml:space="preserve">iungatur a f. </s>
            <s xml:space="preserve">erit & </s>
            <s xml:space="preserve">a faxis eiuſ
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            dem pyramidis ex tertia diffini-
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            tione huius. </s>
            <s xml:space="preserve">Itaque quoniam centrum grauitatis eſt in
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            axe d e; </s>
            <s xml:space="preserve">eſt autem & </s>
            <s xml:space="preserve">in axe a f; </s>
            <s xml:space="preserve">quod proxime demonſtraui</s>
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