Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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            <pb xlink:href="040/01/147.jpg" pagenum="129"/>
            <p type="main">
              <s>SIMP. </s>
              <s>I think ſo, if ſo be the moveable be of a matter
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              durable.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>That hath been already ſuppoſed, when it was ſaid,
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              that all external and accidental impediments were removed, and
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              the brittleneſſe of the moveable in this our caſe, is one of thoſe
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              impediments accidental. </s>
              <s>Tell me now, what do you think is the
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              cauſe that that ſame Ball moveth ſpontaneouſly upon the inclining
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              plane, and not without violence upon the erected?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>Becauſe the inclination of grave bodies is to move
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              wards the centre of the Earth, and onely by violence upwards
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              wards the circumference; and the inclining ſuperficies is that
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              which acquireth vicinity to the centre, and the aſcending one,
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              remoteneſſe.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>Therefore a ſuperficies, which ſhould be neither
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              clining nor aſcending, ought in all its parts to be equally
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              ſtant from the centre. </s>
              <s>But is there any ſuch ſuperficies in the
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              World?</s>
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            <p type="main">
              <s>SIMP. </s>
              <s>There is no want thereof: Such is our Terreſtrial
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              Globe, if it were more even, and not as it is rough and
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              nous; but you have that of the Water, at ſuch time as it is calm
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              and ſtill.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>Then a ſhip which moveth in a calm at Sea, is one of
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              thoſe moveables, which run along one of thoſe ſuperficies that
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              are neither declining nor aſcending, and therefore diſpoſed, in
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              caſe all obſtacles external and accidental were removed, to move
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              with the impulſe once imparted inceſſantly and uniformly.</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>It ſhould ſeem to be ſo.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>And that ſtone which is on the round top, doth not it
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              move, as being together with the ſhip carried about by the
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              cumference of a Circle about the Centre; and therefore
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              quently by a motion in it indelible, if all extern obſtacles be
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              removed? </s>
              <s>And is not this motion as ſwift as that of the ſhip.</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>Hitherto all is well. </s>
              <s>But what followeth?</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>Then in good time recant, I pray you, that your laſt
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              concluſion, if you are ſatisfied with the truth of all the
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              miſes.</s>
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            <p type="main">
              <s>SIMPL. </s>
              <s>By my laſt concluſion, you mean, That that ſame
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              ſtone moving with a motion indelibly impreſſed upon it, is not to
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              leave, nay rather is to follow the ſhip, and in the end to light in
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              the ſelf ſame place, where it falleth when the ſhip lyeth ſtill; and
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              ſo I alſo grant it would do, in caſe there were no outward
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              diments that might diſturb the ſtones motion, after its being let
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              go, the which impediments are two, the one is the moveables
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              inability to break through the air with its meer
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              impetus
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              onely, it
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              being deprived of that of the ſtrength of Oars, of which it had </s>
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          </chap>
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