Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              tur orthogonium POB; denique aſſumatur OR 1/4 totius OB, R erit
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              centrum percuſſionis trianguli ACB per Th. 11. </s>
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              Corollarium.
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              <s id="N29C0A">Hinc colligo quid dicendum ſit de rectangulo ita rotato, vt diagona­
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              lis cadat perpendiculariter in axem, circa quem rotatur; </s>
              <s id="N29C10">ſit enim re­
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              ctangulum CF, cuius diagonalis AIA, axis circa quem voluitur BR, in­
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              ueniantur centra percuſſionis vtriuſque trianguli ſeorſim AFH, ACH,
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              rotati circa axem BR per Th. 16. connectantur rectâ, in hac erit cen­
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              trum percuſſionis totius rectanguli; </s>
              <s id="N29C1C">cù diſtantiæ à centro communi
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              ſint vt pyramides permutando per p.7. vt conſtat ex dictis; ex quibus
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              etiam ſatis intelligetur quid de alijs planis, tùm regularibus, tùm irre­
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              gularibus dicendum ſit, cù ſcilicet poſſint in triangula diuidi. </s>
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              Theorema
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              17.
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              Si voluatur triangulare planum parallelum circulo, in quo voluitur, deter­
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              minari poteſt eius centrum percuſſionis
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              ; </s>
              <s id="N29C41">ſit enim triangulum AFH, quod
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              ita voluatur, vt extremitas H deſcribat arcum HS, & F arcum FR; </s>
              <s id="N29C47">certè
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              F mouetur velociùs quàm H iuxta rationem AF ad AH; </s>
              <s id="N29C4D">ſit ergo FM æ­
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              qualis FA, & HN æqualis HA; </s>
              <s id="N29C53">ducatur MN, erigatur Trapezus FN,
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              donec incubet plano AFH, & cenſeantur ductæ ab A rectæ ad puncta
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              MN erecta; </s>
              <s id="N29C5B">habebitur pyramis; </s>
              <s id="N29C5F">ſit autem centrum grauitatis L, Trapezij
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              FN, ſitque LG perpendicularis in FH, ducatur AG, aſſumaturque DG
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              1/4 AG; </s>
              <s id="N29C67">haud dubiè D eſt centrum grauitatis huius; </s>
              <s id="N29C6B">ſit linea directionis
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              DC; </s>
              <s id="N29C71">quippe punctum D mouetur per Tangentem: </s>
              <s id="N29C75">quod etiam de alijs
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              punctis dictum eſto; </s>
              <s id="N29C7B">eſt enim hæc ratio motus circularis; igitur maximus
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              ictus erit in C per p. </s>
              <s id="N29C81">8. igitur C eſt centrum percuſſionis. </s>
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              Corollarium
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              1.
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              </s>
            </p>
            <p id="N29C93" type="main">
              <s id="N29C95">Collige perinde ſe habere motum puncti F, atque ſi ipſi incumberet
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              linea FM, & puncto H, HN. </s>
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            <p id="N29C9A" type="main">
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              Corollarium
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              2.
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              </s>
            </p>
            <p id="N29CA9" type="main">
              <s id="N29CAB">Præterea centrum percuſſionis aliquando eſſe extra rectam AH, cum
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              ſcilicet angulus circa, quem voluitur eſt minùs acutus, ſit enim trian­
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              gulum AGL quod voluatur circa A, ſitque centrum grauitatis Trapezij
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              E, de quo ſuprà; </s>
              <s id="N29CB5">ducantur EC, AC, ſit CB 1/4 AC, ducatur linea dire­
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              ctionis BI; vides I eſſe extra AL. </s>
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              Corollarium
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              3.
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              </s>
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            <p id="N29CCB" type="main">
              <s id="N29CCD">Præterea oſtendi poſſe longè faciliùs totam rem iſtam; </s>
              <s id="N29CD1">ſit enim tri­
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              angulum ABD; </s>
              <s id="N29CD7">ducatur HBG æqualis BA, perpendicularis in BD; </s>
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              diuidatur AD bifariam æqualiter in L; </s>
              <s id="N29CE0">aſſumatur DE æqualis DL,
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              rùm ducantur HL, GE; </s>
              <s id="N29CE6">inueniatur centrum grauitatis C, Trapezij H
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              LEG; </s>
              <s id="N29CEC">ducatur AC, cuius KC ſit 1/4 ducatur KD perpendicularis in
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              AC, punctum D eſt centrum percuſſionis; </s>
              <s id="N29CF2">quippe ſi vertatur Trapezus
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              HE, circa axem BD, donec AD cadat in illum perpendiculariter, ſit-</s>
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