Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              C eodem modo, quo inuentum eſt centrum F quadrantís rotati: </s>
              <s id="N29EEC">ſimili­
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              ter inueniatur centrum grauitatis TAI rotati; </s>
              <s id="N29EF2">connectantur rectâ hæc
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              duo centra inuenta, ſitque vt duplum BAC ad CAI, ita ſegmentum
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              connectentïs centra, quod terminatur in centro CAI ad aliud ſegmen­
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              tum; punctum diuidens ſegmenta erit centrum grauitatis quæſitum, à
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              quo ſi ducatur perpendicularis, eo modo, quo diximus, hæc dabit cen­
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              trum percuſſionis. </s>
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              <s id="N29F02">Octauò, ſi aſſumatur ſector maior ſemicirculo, v.g. AVBL, eodem
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              modo procedendum eſt; quippe PAV æquiualet CAB, & IAL æquiua­
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              let CAI, & BAP æquiualet BAI, nec eſt noua difficultas. </s>
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              <s id="N29F0E">Nonò, hinc ſi circulus integer circa centrum voluatur, centrum per­
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              cuſſionis erit in K, ſed ictu quadruplo ictus inflicti à quadrante. </s>
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              Theorema
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              21.
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              Si rotetur circulus circa punctum circumferentia vel circa Tangentem,
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              determinari poteſt centrum percuſſionis
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              ; </s>
              <s id="N29F2E">ſit enim centro B, ANCP, rota­
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              tus circa TA, in quam diameter AC cadit perpendiculariter; </s>
              <s id="N29F34">aſſumatur
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              RC 1/3 AC: </s>
              <s id="N29F3A">dico R eſſe centrum percuſſionis; quia motus C eſt ad mo­
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              tum R, vt CF ad RH, & ad motum B, vt CF ad BL, &c. </s>
              <s id="N29F40">igitur perinde
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              ſe habet planum ANCP, atque ſi ſemicylindrus ACF ipſi incubaret,
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              vt patet, ſed centrum grauitatis huius ſolidi eſt X in quo CL & FB de­
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              cuſſantur; </s>
              <s id="N29F4A">ſed vt demonſtratum eſt ſuprà, ſi ducatur HXR, RC eſt 2/3
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              totius AC; igitur R eſt centrum percuſſionis. </s>
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              Corollarium.
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              <s id="N29F60">Primò colligo, ſi ſegmentum circuli voluatur: </s>
              <s id="N29F64">ſimiliter haberi poteſt
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              centrum percuſſionis, inuento ſcilicet centro grauitatis baſis vtriuſque
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              v.g. ſi ſegmentum OAQ voluatur circa TA, inueniri debet centrum
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              grauitatis eiuſdem & ad illud à puncto H recta ducenda; </s>
              <s id="N29F70">itemque in­
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              ueniendum eſt centrum grauitatis ſegmenti Ellipſeos HAI, & ad illud
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              à puncto R ducenda recta; nam vtriuſque decuſſationis punctum dabit
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              centrum grauitatis huius ſolidi, ex qua ſi ducatur perpendicularis in AR,
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              extremitas dabit centrum percuſſionis. </s>
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              <s id="N29F7F">Secundò, ſi voluatur circulus CNAH circa PN, habebitur centrum
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              percuſſionis eodem modo, inuentis ſcilicet centris grauitatis ſemicir­
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              culi PNC, & ſemiellipſeos, cuius altera ſemidiameter ſit BF, altera BP,
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              vt conſtat ex dictis, </s>
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              Theorema
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              22.
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              Si voluatur circulus circa punctum circumferentia in circulo parallelo ſuo
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              plano, determinari poteſt centrum percuſſionis, quod diſtat
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              2/3
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              diametri à cen­
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              tro motus
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              ; </s>
              <s id="N29FB1">ſit enim circulus ACFG, centro B, qui voluatur circa cen­
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              trum A; </s>
              <s id="N29FB7">motus puncti F eſt ad motum puncti B, vt recta AF ad rectam
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              AD, & ad motum puncti C, vt AF ad AC; </s>
              <s id="N29FBD">idem dico de alis punctis; </s>
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              ſit EH æqualis AF, diuiſa bifariam in F, quæ tandiu voluatur, donec </s>
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