Fabri, Honoré, Dialogi physici in quibus de motu terrae disputatur, 1665

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            <p type="main">
              <s id="s.000543">
                <pb pagenum="49" xlink:href="025/01/053.jpg"/>
              nibus abripi ſe ſinunt, quod in præſenti caſu, meo ſaltem iudicio, acci­
                <lb/>
              dit; vt enim in tua ſiſtamus figura; non negabis, opinor, centrum H
                <lb/>
              minimè deſcenſurum, ſi fortè propiùs ad planum CN accedere non poſ­
                <lb/>
              ſet, cùm ex ipſis terminis idem ſit deſcendere, & propriùs ad planum DN
                <lb/>
              accedere; At verò centrum A (
                <emph type="italics"/>
              in Figura perultima
                <emph.end type="italics"/>
              ) propiùs ad planum in cli­
                <lb/>
              natum DH accedere non poteſt, à quo æquali ſemper diſtantiæ menſura
                <lb/>
              diſtat, ſcilicet radio, vnus autem radius alteri æqualis eſt; hinc nunquam
                <lb/>
              diſcedit à linea AG parallela Plano DH, & quodlibet perpendiculum ad
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              planum terminatum à centro A ductum lineæ AF æquale eſt. </s>
            </p>
            <p type="main">
              <s id="s.000544">
                <emph type="italics"/>
              Chryſoc.
                <emph.end type="italics"/>
              </s>
              <s id="s.000545"> Proptereà globus deſcendit, quia eius centrum A non
                <lb/>
              ſuſtinetur in puncto contactus, cùm ſuſtineri non poſſit niſi in perpen­
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              diculo AF. </s>
            </p>
            <p type="main">
              <s id="s.000546">
                <emph type="italics"/>
              Antim.
                <emph.end type="italics"/>
              </s>
              <s id="s.000547"> Rectè, Proptereà globus deſcendit; ſed profectò non pro­
                <lb/>
              pterea globus volvitur, ſive enim volvatur deorſum, ſive deſcendat iux­
                <lb/>
              ta primum modum in ſitu, in quo eſt, centrum A per eandem lineam
                <lb/>
              AG, deorſum tendit, nec vnquam ab ea diſcedit, aut diſcedere poteſt;
                <lb/>
              cur igitur cum vtroque modo, per eandem lineam deſcendere poſſit, hoc
                <lb/>
              ſecundo potiùs, quàm illo primo deſcendit? </s>
              <s id="s.000548">quod enim dicis, Auguſti­
                <lb/>
              ne, centrum gravitatis A eſſe extra perpendiculum, ac proptereà deſ­
                <lb/>
              cendere, id totum verum eſt, & à me admittitur, vndè reverà deſcen­
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              dit; ſed per lineam AG, infrà quam deſcendere nequit; ſed cùm per eam
                <lb/>
              vtroque modo ire poſſit, ac proinde deſcendere, cur, quæſo, vno
                <lb/>
              potiùs quàm alio? </s>
              <s id="s.000549">Sed hoc alio exemplo fortè luculentiore clariſſimè
                <lb/>
              oſtendo. </s>
            </p>
            <figure id="id.025.01.053.1.jpg" xlink:href="025/01/053/1.jpg" number="16"/>
            <p type="main">
              <s id="s.000550">Sit planum inclinatum AB, ſit rectan­
                <lb/>
              gulum C in eo collocatum; certè ſi ſup­
                <lb/>
              ponatur vtrumque lævigatum, deſcen­
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              det rectangulum, per dictum planum,
                <lb/>
              ibitque centrum gravitatis C per CP
                <lb/>
              parallelam plano; nec enim aliter per ſe
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              deſcendere poteſt, nec volvi circa angu­
                <lb/>
              lum D, quod fieri deberet, vt fueret;
                <lb/>
              alioquin centrum C in revolutione aſcen­
                <lb/>
              deret, quod dici non poteſt; Sit enim
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              CD perpendiculum, & CN horizontalis, haud dubie ſi C volvatur
                <lb/>
              circa D, radio DC, tangens decta à puncto C, perpendicularis in
                <lb/>
              CD, ibit ſuprà horizontalem CN, vt patet ad oculum: Dixi per ſe,
                <lb/>
              nam per accidens, cùm à plani ſcabutie impediri poſſit, latus AD, ſu­
                <lb/>
              perior portio quæ libera eſt, impetus vi acquiſiti, prævalens, deor­
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              ſum circum volvitur circa angulum D ; ſed hoc per accidens fit. </s>
              <s id="s.000551">Sit autem
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              aliud rectangulam F in eodem plano inclinato, perpendiculum, FH, ho­
                <lb/>
              rizontalis FO; certè ſi ducatur tangens FK perpendicularis
                <gap/>
              MF; ſi
                <lb/>
              centrum F circa M radio MF volvatur, ibit infra FO, igitur non aſcen­
                <lb/>
              det ſed deſcendet. </s>
              <s id="s.000552">itaque vt ad noſtrum globum redeat oratio cùm </s>
              <s id="s.000553">nec
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              circa punctum D volvi poſſit centrum A, (
                <emph type="italics"/>
              in Figura antepenuissima
                <emph.end type="italics"/>
              ) niſi in-</s>
            </p>
          </chap>
        </body>
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