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

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      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="040/01/159.jpg" pagenum="141"/>
              means move again faſter, than in the air. </s>
              <s>It onely reſts for me to
                <lb/>
              underſtand, whether in this ſecond motion on the Earth it move
                <lb/>
              more ſwiftly, than in the firſt; for then it would move
                <emph type="italics"/>
              in
                <lb/>
              tum,
                <emph.end type="italics"/>
              alwayes accelerating.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>I did not abſolutely affirm, that this ſecond motion is
                <lb/>
              more ſwift than the firſt; but that it may happen ſo to be
                <lb/>
              times.</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>This is that, which I apprehend not, and which I
                <lb/>
              deſire to know.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>And this alſo you know of your ſelf. </s>
              <s>Therefore tell
                <lb/>
              me: When you let the top fall out of your hand, without
                <lb/>
              king it turn round (
                <emph type="italics"/>
              i. </s>
              <s>e.
                <emph.end type="italics"/>
              ſetting it) what will it do at its coming to
                <lb/>
              the ground?</s>
            </p>
            <p type="main">
              <s>SIMP. Nothing, but there lie ſtill.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>May it not chance, that in its fall to the ground it may
                <lb/>
              acquire a motion? </s>
              <s>Think better on it.</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>Unleſſe we let it fall upon ſome inclining ſtone, as
                <lb/>
              children do playing at ^{*}
                <emph type="italics"/>
              Chioſa,
                <emph.end type="italics"/>
              and that falling ſide-wayes upon </s>
            </p>
            <p type="main">
              <s>
                <arrow.to.target n="marg326"/>
                <lb/>
              the ſame, it do acquire the motion of turning round upon its toe,
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              wherewith it afterwards continueth to move progreſſively on the
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              floor, I know not in what other manner it can do any thing but
                <lb/>
              lie ſtill where it falleth.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg326"/>
              * A Game in
                <emph type="italics"/>
              Italy,
                <emph.end type="italics"/>
                <lb/>
              which is, to glide
                <lb/>
              bullets down an
                <lb/>
              inclining ſtone,
                <lb/>
                <emph type="italics"/>
              &c.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>You ſee then that in ſome caſe it may acquire a new
                <lb/>
              revolution. </s>
              <s>When then the top jerked up from the ground, falleth
                <lb/>
              down again, why may it not caſually hit upon the declivity of
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              ſome ſtone fixed in the floor, and that hath an inclination that
                <lb/>
              way towards which it moveth, and acquiring by that ſlip a new
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              whirle over and above that conferred by the laſh, why may it
                <lb/>
              not redouble its motion, and make it ſwifter than it was at its
                <lb/>
              firſt lighting upon the ground?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>Now I ſee that the ſame may eaſily happen. </s>
              <s>And I
                <lb/>
              am thinking that if the top ſhould turn the contrary way, in
                <lb/>
              riving at the ground, it would work a contrary effect, that is,
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              the motion of the accidental whirl would retard that of the
                <lb/>
              jicient.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>And it would ſometimes wholly retard and ſtop it, in
                <lb/>
              caſe the revolution of the top were very ſwift. </s>
              <s>And from hence
                <lb/>
              riſeth the reſolution of that ſlight, which the more skilful Tennis
                <lb/>
              Players uſe to their advantage; that is, to gull their adverſary by
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              cutting (for ſo is their Phraſe) the Ball; which is, to return it
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              with a ſide Rachet, in ſuch a manner, that it doth thereby
                <lb/>
              quire a motion by it ſelf contrary to the projected motion, and ſo
                <lb/>
              by that means, at its coming to the ground, the rebound, which
                <lb/>
              if the ball did not turn in that manner, would be towards the
                <lb/>
              adverſary, giving him the uſual time to toſſe it back again, doth </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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