Valerio, Luca, De centro gravitatis solidorvm libri tres
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              PROPOSITIO IIII.
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              <s>Si conoidi parabolico figura circumſcribatur,
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              & altera inſcribatur ex cylindris æqualium alti­
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              tudinum, binis circa communes axes ſegmenta
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              axis conoidis, & inter eadem plana parallela, mi­
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              nimo circumſcriptorum ad nullum relato; omnia
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              reſidua cylindrorum figuræ circumſcriptæ dem­
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              ptis figuræ inſcriptæ cylindris, & inter ſe, & mi­
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              nimo cylindro æqualia erunt. </s>
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              <s>Sit conoidi parabolico ABC, cuius axis BD circum­
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              ſcripta figura ex quotcumque cylindris æqualium altitu­
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              dinum, quorum tres deinceps ſint EL minimus ſupremus,
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              & GQ, IR, quorum baſes eodem ordine circuli, quorum
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              ſemidiametri ad parabolæ, quæ figuram deſcribit diame­
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              trum BD ordi­
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              natim applicatæ
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              ſint EF, GH, IK:
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              & in duplos cre­
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              ſcentibus cylin­
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              dris circa
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              axium duplos a­
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              xes BH, IK, HD,
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              &
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              c deinceps
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              quotcumque plu­
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              res eſsent; ſit co­
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              noidi ABC in­
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              ſcripta figura ex cylindris æqualium altitudinum inter ſe, &
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              circumſcriptis. </s>
              <s>Bini itaque circa communes axes inter ea­
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              dem plana parallela interijcientur, minimo EL ad nullum </s>
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