Valerio, Luca, De centro gravitatis solidorum, 1604
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              <s>
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              PROPOSITIO XXXIX.
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              <s>Omnis coni centrum grauitatis axim ita diui­
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              dit, vt ſegmentum ad verticem ſit reliqui triplum. </s>
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              <s>Sit conus ABC, cuius vertex B, axis autem BD, cu­
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              ius BE, ſit tripla ipſius ED. </s>
              <s>Dico punctum E, eſse co­
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              ni ABC, centrum grauitatis. </s>
              <s>Si enim cono ABC, pyramis
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              inſcribatur, cuius baſis inſcripta circulo AC, æquilatera ſit,
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              & æquiangula, eius centrum grauitatis erit idem quod &
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              figuræ centrum, ſed centrum
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              talis figuræ circulo inſcriptæ
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              idem eſt, quod centrum cir­
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              culi, vt colligitur ex demon­
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              ſtrationibus quarti Elemen­
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              torum; inſcriptæ igitur pyra
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              midis erit axis BD, & cen­
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              trum grauitatis E. talis au­
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              tem ea pyramis inſcribi po­
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              teſt, vt à cono deficiat mino­
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              ri ſpacio quantacumque ma
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              gnitudine propoſita; igitur
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              ABC, coni centrum graui­
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              tatis erit E. </s>
              <s>Quod demonſtrandum erat. </s>
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            <figure id="id.043.01.085.1.jpg" xlink:href="043/01/085/1.jpg" number="55"/>
            <p type="head">
              <s>
                <emph type="italics"/>
              PROPOSITIO XXXX.
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              </s>
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              <s>Omnis fruſti conici centrum grauitatis idem
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              eſt in axe centro grauitatis fruſti pyramidis baſim
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              habentis æquilateram, & æquiangul am in ſcriptæ
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              cono, ab ſciſſi eodem plano, quo coni fruſtum. </s>
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