Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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              <s id="s.000610">
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              & denique punctum h pyramidis abcdef grauitatis eſſe
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              centrum, & ita in aliis.</s>
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              2. fexti.</s>
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              <s id="s.000612">Sit conus, uel coni portio axem habens bd: ſeceturque
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              plano per axem, quod ſectionem faciat triangulum abc:
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              & bd axis diuidatur in c, ita ut be ipſius ed ſit tripla. </s>
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              <s id="s.000613">Dico punctum e coni, uel coni portionis, grauitatis
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              eſſe centrum. </s>
              <s id="s.000614">Si enim fieri poteſt, ſit centrum f: & pro­
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              ducatur ef extra figuram in g. </s>
              <s id="s.000615">quam uero proportionem
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              habet ge ad ef, habeat baſis coni, uelconi portionis, hoc
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              eſt circulus, uel ellipſis circa diametrum ac ad aliud ſpa­
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              cium, in quo h. </s>
              <s id="s.000616">Itaque in circulo, uel ellipſi plane deſcri­
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              batur rectilinea figura axlmcnop, ita ut quæ
                <expan abbr="relinquũ-tur">relinquun­
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                tur</expan>
              portiones ſint minores ſpacio h: & intelligatur pyra­
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              mis baſim habens rectilineam figuram aKlmcnop, &
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              axem bd; cuius quidem grauitatis centrum erit punctum
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              e, ut iam demonſtrauimus. </s>
              <s id="s.000617">Et quoniam portiones ſunt
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              minores ſpacio h, circulus, uel ellipſis ad portiones ma­
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                <figure id="id.023.01.066.1.jpg" xlink:href="023/01/066/1.jpg" number="59"/>
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              iorem proportionem habet, quam ge ad ef. </s>
              <s id="s.000618">ſed ut circu­
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              lus, uel ellipſis ad figuram rectilineam ſibi inſcriptam, ita
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              conus, uel coni portio ad pyramidem, quæ figuram rectili­
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              neam pro baſi habet; & altitudinem æqualem: etenim </s>
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