Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667
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              <s>
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              hard, as ſuppoſe of braſs; what think you it would do being let
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              go? </s>
              <s>do not you believe (as for my part I do) that it would lie
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              ſtill?</s>
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            <p type="main">
              <s>SIMPL. </s>
              <s>If that ſuperficies were inclining?</s>
            </p>
            <p type="main">
              <s>SALV. Yes; for ſo I have already ſuppoſed.</s>
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            <p type="main">
              <s>SIMPL. </s>
              <s>I cannot conceive how it ſhould lie ſtill: nay, I am
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              confident that it would move towards the declivity with much
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              penſneſs.</s>
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              <s>SALV. </s>
              <s>Take good heed what you ſay,
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              Simplicius,
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              for I am
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              confident that it would lie ſtill in what ever place you ſhould lay
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              it.</s>
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            <p type="main">
              <s>SIMPL. </s>
              <s>So long as you make uſe of ſuch ſuppoſitions,
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              viatus,
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              I ſhall ceaſe to wonder if you inferr moſt abſurd
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              cluſions.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>Are you aſſured, then, that it would freely move
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              wards the declivity?</s>
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              <s>SIMPL. </s>
              <s>Who doubts it?</s>
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            <p type="main">
              <s>SALV. </s>
              <s>And this you verily believe, not becauſe I told you ſo,
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              (for I endeavoured to perſwade you to think the contrary) but of
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              your ſelf, and upon your natural judgment.</s>
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            <p type="main">
              <s>SIMPL. </s>
              <s>Now I ſee what you would be at; you ſpoke not this
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              as really believing the ſame; but to try me, and to wreſt matter
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              out of my own mouth wherewith to condemn me.</s>
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              <s>SALV. </s>
              <s>You are in the right. </s>
              <s>And how long would that Ball
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              move, and with what velocity? </s>
              <s>But take notice that I inſtanced
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              in a Ball exactly round, and a plain exquiſitely poliſhed, that all
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              external and accidental impediments might be taken away. </s>
              <s>And
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              ſo would I have you remove all obſtructions cauſed by the Airs
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              ſiſtance to diviſion, and all other caſual obſtacles, if any other
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              there can be.</s>
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              <s>SIMPL. </s>
              <s>I very well underſtand your meaning, and as to your
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              demand, I anſwer, that the Ball would continue to move
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              in
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              finitum,
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              if the inclination of the plain ſhould ſo long laſt, and
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              tinually with an accelerating motion; for ſuch is the nature of
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              ponderous moveables, that
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              vires acquirant eundo
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              : and the
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              er the declivity was, the greater the velocity would be.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>But if one ſhould require that that Ball ſhould move
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              upwards on that ſame ſuperficies, do you believe that it would
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              ſo do?</s>
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            <p type="main">
              <s>SIMPL. </s>
              <s>Not ſpontaneouſly; but being drawn, or violently
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              thrown, it may.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>And in caſe it were thruſt forward by the impreſſion of
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              ſome violent
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              impetus
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              from without, what and how great would
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              its motion be?</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>The motion would go continually decreaſing and </s>
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