Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              que ſectio communis BD; certè habebitur baſis pyramidis, cuius axis
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              erit AC, quæ omnia conſtant. </s>
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              Theorema
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              18.
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              Determinari poteſt centrum percuſſionis in latere orthogonij ſubtenſo angulo
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              recto
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              ; </s>
              <s id="N29D1A">ſit enim AGB, latuſque ſubtenſum angulo recto AB, ſit Trape­
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              zus KD, eo modo quo diximus, cuius centrum grauitatis ſit H, ducatur
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              AH, aſſumatur IH 1/4: </s>
              <s id="N29D22">AH, ducatur IM perpendicularis in AH: dico
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              punctum M eſſe centrum percuſſionis, quod demonſtratur per Theo­
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              rema 17. </s>
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              Theorema
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              19.
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              Si voluatur triangulum prædictum, circa angulum rectum, determinari
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              poteſt
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              centrum percuſſionis
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              ; </s>
              <s id="N29D4B">ſit enim triangulum ABH, quod voluatur
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              circa centrum B; </s>
              <s id="N29D51">motus puncti A eſt ad motum H, vt BA, ad BH; </s>
              <s id="N29D55">ſit ergo
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              Trapezus MG, cuius latus ML ſit æquale AB, & GI æquale BH; </s>
              <s id="N29D5B">erit
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              pyramis, eo modo, quo diximus ſuprà; </s>
              <s id="N29D61">ſit autem D centrum grauitatis
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              baſis, ſeu Trapezij, & AD axis; </s>
              <s id="N29D67">ſit KD 1/4 BD; </s>
              <s id="N29D6B">ſit denique KE perpen­
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              dicularis in DB: dico punctum E eſſe centrum percuſſionis, quod co­
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              dem modo demonſtratur, quo ſuprà. </s>
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              Corollarium.
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              <s id="N29D83">Hinc colligo primò, de omni triangulo idem prorſus dicendum eſſe,
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              eſt enim eadem ratio, vt conſideranti patebit. </s>
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              <s id="N29D8A">Secundò, ſi voluatur circa punctum aliquod lateris, poſſe determinari
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              centrum percuſſionis; </s>
              <s id="N29D90">ſit enim triangulum ABC; </s>
              <s id="N29D94">aſſumatur punctum
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              M, circa quod voluatur mode prædicto, motus puncti C, eſt ad motum
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              puncti A, vt MC, vel DX, ad MA, vel PO; </s>
              <s id="N29D9C">hinc Trapezus DPOX, id eſt
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              baſis pyramidis, cuius axis eſt MG, & centrum grauitatis K: </s>
              <s id="N29DA4">ſimiliter
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              habetur Trapezus DRNX; </s>
              <s id="N29DAA">id eſt baſis alterius pyramidis, cuius axis eſt
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              MV, & centrum grauitatis H; </s>
              <s id="N29DB0">fiat autem vt vtraque pyramis ad eam, cuius
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              axis eſt MG, ita tota HK, ad HI; </s>
              <s id="N29DB6">dico I eſſe centrum commune graui­
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              tatis; </s>
              <s id="N29DBC">ducatur IL perpendicularis in IM; dico L eſſe centrum percuſ­
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              ſionis quæſitum. </s>
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              <s id="N29DC4">Tertiò, ſi voluatur circa aliud punctum, res eodem modo ſuc­
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              cedet. </s>
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              <s id="N29DCB">Quartò, ſi ſit ſolidum ad inſtar cunei, conſtans ſcilicet ex multis pla­
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              nis triangularibus, quæ probè inter ſe conueniant; idem etiam accidet,
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              quæ omnia ex ſuprà dictis clariſſima efficiuntur. </s>
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              <s id="N29DD5">Quintò, ſi ſit triangulum EAD, fig. </s>
              <s id="N29DD8">quod ita voluatur circa centrum
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              A, vt latus AE, modò accedat ad CB, modò recedat; </s>
              <s id="N29DDE">ſitque ita diuiſa AS
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              in R, vt RS ſit 1/4 AS, ſi ducatur RN, centrum percuſſionis erit in N,
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              quia R eſt centrum grauitatis geminæ pyramidis; </s>
              <s id="N29DE6">igitur RN linea di­
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              rectionis inſtanti percuſſionis; ſi verò producatur AS in G, ſintque I &
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              M centra grauitatis pyramidum ducanturque IF, MF perpendiculares
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              in AI. AM, centrum percuſſionis erit F, vt conſtat ex dictis. </s>
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