Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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            <p id="N1207D" type="main">
              <s id="N1207F">
                <pb pagenum="67" xlink:href="005/01/075.jpg"/>
              eſt intrinſeca ipſa grauitas, quæ tanquam proprium ope­
                <lb/>
              randi principium eſt illis ratio, vt moueantur deorſum, ſeu
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              forma qua in ſe ſecluſis impedimentis, talem motum pro­
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              ducunt. </s>
              <s id="N12097">Quod optimè expreſſit Ariſtoteles lib. 8. Phyſic.
                <lb/>
              tex. 32. & lib. 1. de Cœlo, tex. 17. & lib. 4. tex. 6. Ratio au­
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              tem eſt manifeſta, quia ſenſu conſtat, efficaciam, ac celeri­
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              tatem in motu deorſum creſcere creſcente grauitate cor­
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              poris, ac minui ad diminutionem illius (vt idem Philoſo­
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              phus obſeruauit 1. de Cœlo tex. 89.) quod non poſſet con­
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              tingere ſi in ipſo corpore graui grauitas non eſſet propria
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              cauſa effectiua ipſius motus, quæ ſimul cum effectu creſce­
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              ret, ac decreſceret. </s>
              <s id="N120B3">Sicut calor, qui dum intenditur, aut re­
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              mittitur, efficacius aut remiſſius operatur,
                <expan abbr="maioremq.">maioremque</expan>
              aut
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              minorem calefactionis motum producit, eo quod ſimiliter
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              eſt ratio formalis calefaciendi, ſicut grauitas ſe deorſum
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              mouendi. </s>
              <s id="N120C2">
                <expan abbr="Nullumq.">Nullumque</expan>
              eſt inconueniens, idem corpus eſſe
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              poſſe mouens & motum, cum in corpore graui ſit potentia
                <lb/>
              receptiua motus, & grauitas, quæ eſt
                <expan abbr="potẽtia">potentia</expan>
              effectiua illius. </s>
            </p>
            <p id="N120D0" type="main">
              <s id="N120D2">Diximus verò grauia moueri deorſum per
                <expan abbr="rectã">rectam</expan>
              lineam,
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              quæ centrum grauitatis ipſorum,
                <expan abbr="centrumq.">centrumque</expan>
              mundi conne­
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              ctit: Nam ſenſu pariter conſtat, illa non tendere ad ipſum
                <lb/>
              mundi centrum per lineam aliquam obliquam, neque per
                <lb/>
              lineam rectam, quæ ab extremo quoddam, vel quauis alia
                <lb/>
              parte ipſius ad mundi centrum extendatur, ſed per
                <expan abbr="eã">eam</expan>
              , quam
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              diximus
                <expan abbr="lineã">lineam</expan>
              , quæ ab eius centro grauitatis rectà ad mun­
                <lb/>
              di centrum propendet. </s>
              <s id="N120F3">Omnis enim grauitas cuiuſque
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              grauis ita in ipſo grauitatis centro colligitur, & coacerua­
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              tur, vt extra ipſum nihil grauitare propemodum in corpori­
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              bus videatur:
                <expan abbr="proindeq.">proindeque</expan>
              non niſi ipſomet centro rectà deor­
                <lb/>
              ſum eadem corpora ferri conſpicimus naturali propenſio­
                <lb/>
              ne. </s>
              <s id="N12104">Quo pariter fit, vt ſi aliundè quàm ab ipſius grauitatis
                <lb/>
              centro graue aliquod ſuſpendatur, ſtatim grauitatis centro
                <lb/>
              deorſum tendente conuertatur, nec manere vnquam poſſit
                <lb/>
              donec ipſum grauitatis centrum ſub puncto ſuſpenſionis per
                <lb/>
              lineam horizonti perpendicularem conſtituatur. </s>
              <s id="N1210F">Quando­
                <lb/>
              quidem tunc idem eſt, ac ſi corpus per ipſummet grauita­</s>
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